JP2008174340A - Manually running type lifter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manually running type lifter capable of safely performing a work of loading a cargo conveying vehicle onto a cargo bed of a truck. <P>SOLUTION: The lifter is guided in an elevating/lowering manner by a guide mechanism provided on a frame body side having traveling wheels on its bottom part and capable of elevating/lowering a cargo conveying vehicle. Stay members 121 are erected on both side parts of an opening part for entrance on the front side of a ramp 10, and a movement restraining member 122 of a cargo conveying vehicle having a U-shape in plan view which comprises a horizontal bar part 122a and arm parts 122b provided on both ends of the horizontal bar part and mounted on each stay member via a horizontal fitting shaft 123 are provided on upper parts of both stay members rockingly in the vertical plane. In addition, a gas spring 126 which is expandable with a predetermined stroke is fitted over the movement restraining member and the stay members. The restraining posture by the horizontal bar part of the movement restraining member is determined so that the horizontal bar part is above the fitting position by the horizontal fitting shaft. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a manually operated lifter used for loading and unloading loads on a truck bed, for example.

  For example, when loading or unloading many or large loads onto a truck bed, a luggage carrier is used, and a manual lifter is used to move the luggage carrier to the truck bed. It is used.

  Conventionally, such a manual travel type lifter includes, for example, a frame body having traveling wheels, a lift platform guided by a guide mechanism provided on both sides of the frame body so as to be movable up and down, and the lift platform. It consists of a lifting device.

Then, when moving the load on the truck bed using this lifter, that is, when moving the load transport vehicle, the operator pushes the load transport vehicle from the one end side opening onto the lift platform in the lowered position, and then lifts and lowers the lift device. Thus, the lifting platform is raised to the loading platform position of the truck, and the operator pushes and moves the cargo transport vehicle onto the loading platform of the truck from the other end side opening (see, for example, Patent Document 1).
JP2005-221930

  However, according to the above-described manual travel lifter, after the load transporter is moved to the truck bed, the load carrier of the truck is tilted, for example, during the work of loading the load transport vehicle using the manual travel lifter. In some cases, the baggage carrier may go back, and it is necessary to ensure the safety of the loading operation.

  Accordingly, an object of the present invention is to provide a manual travel type lifter that can safely perform the work of loading a load transport vehicle on a truck bed, for example.

In order to solve the above-mentioned problems, a manual travel lifter according to a first aspect of the present invention includes a frame body having a traveling wheel at the bottom, and a lift platform that is guided so as to be movable up and down by a guide mechanism provided on the frame body side. And a lifting device that raises and lowers the lifting platform, and a handrail that is erected on at least both sides of the lifting platform, and is a lifter that can lift and lower at least a load transport vehicle,
The column members are erected on both sides of a predetermined cargo entry / exit opening portion of the lifting platform, and the column members are provided at the upper portions of both column members and at both ends of the horizontal bar portion. A movement-stopping member of a U-shaped luggage carrier vehicle having a U-shape in plan view, which is formed of an arm portion attached to a horizontal attachment shaft on a vertical plane,
Further, an expansion / contraction member, such as a gas spring, which can be extended and contracted with a predetermined stroke over the movement stop member and the column member is attached, and the stop posture by the horizontal bar portion of the movement stop member is at least an attachment position by the horizontal attachment shaft. The horizontal bar portion is at an upper position.

The manual travel lifter according to claim 2 is configured such that when the movement restraining member comes into contact with an obstacle from below due to the lift of the lift in the lifter according to claim 1, the movement restraining member swings downward. In the avoidance posture to avoid the collision,
The connecting shaft to the movement restraining member of the expansion / contraction member is configured to be positioned on the lifting platform side from the line connecting the attachment shaft position of the movement stopping member to the support member and the connecting shaft position of the expansion / contraction member to the support member,
Even when an extension force is applied to the telescopic member after the movement restraining member comes into contact with the obstacle and assumes the avoidance posture, the avoidance posture is maintained.

  According to the configuration of the above-described manual lifter, for example, when loading a cargo transport vehicle on a truck bed, first the luggage transport vehicle is loaded and raised on the platform, and then moved to the truck platform, and then the platform is lowered. In this lowered position of the lifting platform, even if the loaded cargo vehicle has moved to the end of the truck bed and is about to fall off the truck bed, the movement, that is, the fall, can be restrained, so loading of the luggage Work can be done safely.

  Furthermore, even if the movement restraining member comes into contact with the obstacle, for example, from the lower side due to the lift of the elevator, and the movement restraining member assumes the avoidance posture, the avoidance posture is maintained. Even when the member rises from the roof portion and then descends, the movement restraining member can be prevented from colliding with the roof portion.

[Embodiment]
Hereinafter, a manual travel lifter according to an embodiment of the present invention will be described with reference to the drawings.
Note that the gist of the present invention is that, when a load transport vehicle (specifically, a roll box pallet or the like is used) loaded with a load is loaded by, for example, a manual traveling lifter, the load transport vehicle loaded is loaded on a truck bed, for example. Is provided with a mechanism that can stop (prevent), for example, the vehicle from moving on the platform of the truck and falling from the platform, in the description of the present embodiment, After describing the configuration, a description will be given of a load-carrying vehicle restraining mechanism according to the gist of the present invention.

  First, the basic configuration of the manual travel lifter will be described in some detail based on FIGS. 7 to 18, the illustration of the restraining mechanism of the luggage carrier described later is omitted.

  7 to 10 and 14, a vehicle body (an example of a frame body) 1 includes a pair of left and right side frames 2, a front frame 4 connected between front ends of these side frames 2 via wheel brackets 3, and the like. Thus, it is formed in a U shape in plan view. A rubber pad (an example of a landing body) 5 is provided by screws or the like on the rear lower surface side of the vehicle body 1, that is, on the rear lower surface side of the side frame 2. On the vehicle body 1 side, a lifting platform (also referred to as a loading platform) 10 that can be moved up and down, a pair of left and right front wheels 40, and one rear wheel 60 are provided.

  That is, the lifting platform 10 is formed in a frame shape in which the front and rear and the upper side are opened by a rectangular floor plate portion 11 and side plate portions (side portions of the lifting platform) 12 erected from both sides of the floor plate portion 11. Has been. On the outer surface side of the side plate portion 12, a handrail body 13 formed by bending a pipe or the like is continuously provided upward. Here, the rear part of the floor board part 11 is formed on the lower inclined surface 11a for transition, as it goes rearward. On the rear side of the lifting platform 10, a riding portion 14 located at the center portion in the left-right direction B is provided in a state of protruding rearward. Here, the rear part of the riding part 14 is formed in the lower inclined slope 14a toward the rear.

  In addition, the front and rear of the elevator platform 10 are made into an entrance / exit opening (a luggage entry / exit opening) of a cargo transport vehicle K as a load. For example, the load transport vehicle K is loaded from the rear entrance / exit opening. The cargo transport vehicle K is moved (loaded) from the front entrance / exit opening to the truck bed T side.

  And the raising / lowering of the said raising / lowering stand 10 is comprised so that the hydraulic type raising / lowering apparatus 20 provided in the vehicle body 1 side may be performed. That is, outside the handrail 13, a pair of front and rear outer masts 21 are erected from the left and right side frames 2, and a connecting member 22 is provided between the upper ends of the front and rear outer masts 21. Both outer masts 21 are U-shaped rails, and are erected with their open portions facing each other.

  A pair of front and rear inner masts 23 is disposed between the front and rear outer masts 21, and a connecting member 24 is disposed between the upper and lower ends of the front and rear inner masts 23. Both inner masts 23 are U-shaped rails, and are arranged with their open portions facing each other. In the lower part of both inner masts 23, left and right guide rollers 25 and front and rear guide rollers 26 are provided that are fitted and guided to the outer mast 21 side. Freely configured. In addition, the guide mechanism of the lifting platform 10 is comprised by 21-26.

  Between the front and rear inner masts 23, a rectangular frame-like lifting body 27 is disposed. In the lifting body 27, left and right guide rollers 28 and front and rear guide rollers 29 that are guided by being fitted to the inner mast 23 side. Therefore, the elevating body 27 is configured to be movable up and down with respect to the inner mast 23. A lift bracket 30 connected to the inner surface side of the lifting body 27 is connected to the outer surface side of the side plate portion 12 in the lifting platform 10, and the lifting platform 10 is configured to be movable up and down integrally with the left and right lifting bodies 27. The

  A lift cylinder 31 is provided between the vehicle body 1 and the inner mast 23 side. That is, the lift cylinder 31 is fixed by placing the lower end of the cylinder body 31A penetrating the elevating body 27 on the left and right side frames 2 in the vehicle body 1, and the piston rod 31B facing upward is the upper end side of the inner mast 23. The connecting member 24 is connected. The connecting member 24 is provided with an idler tooth ring 32, and an outer lower end of a chain 33 wound around the idler tooth wheel 32 is connected to the outer mast 21 side via a connecting body 34. Is connected to the lift bracket 30 side via a connecting body 35.

  The right side and the front side of the front outer mast 21 are provided with a hydraulic unit 37 including an electric motor 36 and a hydraulic pump driven by the electric motor 36, an electromagnetic switching valve, and the like. Control means 38 for controlling the equipment and the like is provided.

  Accordingly, by operating the lift cylinder 31, the inner mast 23 can be moved up and down with respect to the outer mast 21, and the lift bracket is lifted via the chain 33 by the lifting and lowering of the rotating tooth ring 32 integrated with the inner mast 23. 30 can be moved up and down by twice the amount of lifting of the inner mast 23, and thus the lifting platform 10 can be moved up and down. An example of the hydraulic lifting device 20 is configured by the above 21 to 38 and the like.

  Both front wheels 40 are configured to be freely changeable between a position facing the front-rear direction A and a position facing the left-right direction B. The front wheels 40 are each provided with an operation lever 45 for changing the direction, so that the front wheels 40 can change the direction in conjunction with either lever operation.

  That is, bearing bodies (bearings and the like) 41 are respectively provided on the upper plate portions of the brackets 3 for both wheels, and wheel supports 42 that are supported and guided by the bearing bodies 41 and are rotatable around the longitudinal axis 42a. Is provided. The lower portion of the wheel support 42 is positioned in the wheel bracket 3, and the front wheel shaft 43 in the lateral direction is provided through the lower portion of the wheel support 42. The front wheels 40 are provided at both ends of the front wheel shaft 43, that is, The front wheels 40 are provided on both sides of the wheel support 42 so as to be freely rotatable. Thereby, the front wheel 40 is free to play around the wheel axis 43a intersecting with the longitudinal axis 42a with respect to the wheel support 42 that is rotatable around the longitudinal axis 42a with respect to the vehicle body 1 side. It is provided so that it can roll freely.

  The upper end of the wheel support 42 is connected to the lower end of the vertical member 44, and the operation lever 45 for changing the direction is connected to the upper end of the vertical member 44 sideways. An operation grip 46 is provided. A cylindrical member 47 is externally fitted and connected to the lower portion of the vertical member 44, and a connecting bar 49 in the left-right direction B is provided between the free ends of the arms 48 that are continuously provided outward from the cylindrical member 47. Are connected to each other through a vertical pin 50 so as to be relatively rotatable. At that time, the left arm 48 is connected forward and the right arm 48 is connected rearward, so that the connecting bar 49 is inclined.

7 to 10 and 15 to 17, the rear wheel 60 is configured to be freely changeable through an operation lever 72 interlocked with a wheel support 67.
That is, of the side frames 2 of the vehicle body 1, the right side frame 2 is formed slightly longer rearward, and a bracket 61 is continuously provided rearward from the upper surface of the rear end. A base end of a swing frame 62 is connected to the bracket 61 via a vertical pin 63 so as to be swingable. A vertical guide cylinder 64 is connected to the free end of the swing frame 62, and an outer cylinder 65 is inserted into the guide cylinder 64 so as to be relatively movable up and down and rotatable. At this time, a ring-shaped body 65a capable of contacting the upper surface of the guide cylinder 64 is provided at the upper end of the outer cylinder 65 so that the lowering limit of the outer cylinder 65 with respect to the guide cylinder 64 is regulated. It is configured.

  An inner cylinder 66 is inserted into and fixed to the outer cylinder 65. A wheel support 67 is connected to the lower end of the inner cylinder 66, so that the wheel support 67 is integrated with the inner cylinder 66 and the outer cylinder 65 and supported and guided to the guide cylinder 64 side in the vertical direction. It is configured to be rotatable around an axis 67a. A rear wheel shaft 68 in the horizontal direction is provided through the lower portion of the wheel support 67, and the rear wheels 60 are distributed to both ends of the rear wheel shaft 68, that is, distributed to both sides of the wheel support 67. 60 are provided so as to be freely rotatable. As a result, the rear wheel 60 is provided so as to be freely rotatable around a wheel axis 68a intersecting with the vertical axis 67a with respect to a wheel support 67 rotatable around the vertical axis 67a.

  Further, a support 69 is connected to the upper end of the inner cylinder 66, and a horizontal pin 70 is provided through the support 69, and a disc-shaped cam body is provided at the central portion of the horizontal pin 70. 71 is provided eccentrically. The base end of the operation lever 72 is connected to the minimum eccentric position (minimum eccentric cam surface) of the cam body 71, and an operation grip 73 is provided at the free end of the operation lever 72.

  A brake rod 74 is positioned in the inner cylinder 66 so as to be movable up and down, and an upper end of the brake rod 74 is configured to be in contact with the cam surface of the cam body 71 from below. A brake bar 75 is connected to the lower end of the brake rod 74, and the brake bar 75 protrudes outward through a through-hole 66 a formed in the inner cylinder 66 below the outer cylinder 65. ing. The protruding portion of the brake bar 75 is provided with a screw adjustment type brake body 76, which faces the rear wheel 60 from above. Note that a spring 77 is provided between the brake bar 75 and the wheel support 67 in the inner cylinder 66 to urge the brake rod 74 upward.

  Accordingly, the operation lever 72 can be switched between a standing posture and a horizontal posture around the axis of the horizontal pin 70, and the cam body 71 is rotated via the horizontal pin 70 by switching to the standing posture. The maximum eccentric position (maximum eccentric cam surface) is positioned below. As a result, the brake rod 74 is pushed down against the spring 77 to lower the brake bar 75, and the brake body 76 is pressed against the rear wheel 60 from above, whereby the rear wheel 60 can be braked. Further, by switching the operation lever 72 to the horizontal posture, the brake rod 74 is not pushed down, so that the brake bar 75 can be raised by the urging force of the spring 77 to release the braking on the rear wheel 60.

  Then, by applying a rotational force to the inner cylindrical body 66 via the operation lever 72 that is switched to the horizontal posture, the rear wheel 60 is changed in the direction toward the front-rear direction A and the position toward the left-right direction B. In addition, conversion between the two positions is possible. Further, the swinging frame 62 can be swung around the vertical pin 63 by pushing and pulling the operating lever 72 that has been switched to the horizontal posture to apply a swinging force to the swinging frame 62, and thus the rear wheel. 60 can be switched between a state in which 60 is positioned behind the elevator 10 and a state in which the right side frame 2 outside the elevator 10 is positioned rearward.

  The rear wheel 60 is movable up and down with respect to the vehicle body 1 side, and is lowered and landed in conjunction with the lowering of the lift table 10 and is lifted and interlocked with the lift table 10 ascending to land the vehicle body 1 side. It is configured as follows. In other words, a bracket 78 is connected to the middle position of the swing frame 62 upward, and the arm body 80 is connected to the bracket 78 via a lateral pin 79 in a direction perpendicular to the length direction of the swing frame 62. Thus, the arm body 80 is configured to be swingable up and down. Here, the arm body 80 has a link frame shape and is disposed in a state where the inner cylinder body 66 is inserted above the outer cylinder body 65.

  A receiving roller 81 is provided between the free ends of the arm body 80 so as to be freely rotatable, and in the vicinity of the free end of the arm body 80, the swing frame 62 side swings by being locked on the lifting platform 10 side. A protrusion 82 is provided to prevent this. A push-down roller 84 is rotatably provided at an intermediate portion between both arm bodies 80 via a bracket 83. The push-down roller 84 can be brought into contact with the upper surface of the ring-shaped body 65a and It is configured to rotate freely during rotation.

  A stopper body 85 is provided on the lower surface side of the arm body 80 at a position between the receiving roller 81 and the pressing roller 84, and a stopper body 86 is provided on the upper portion of the guide cylinder body 64. Here, the stopper body 86 is moved when the arm body 80 swings downward to bring the ring-shaped body 65a into contact with the upper surface of the guide cylinder 64, that is, when the arm body 80 swings downward and becomes horizontal. The stopper body 85 is set to be received.

  As described above, when the swinging frame 62 is swung inward around the vertical pin 63 by applying a swinging force to the swinging frame 62 via the operation lever 72 that has been switched to the horizontal posture, When the moving frame 62 is along the left-right direction B, a positioning body 87 is connected to the support body 61 so that the base side of the swinging frame 62 can freely come into contact therewith. In this positioning state, the rear wheel 60 is positioned near the riding portion 14, and the receiving roller 81 is configured to enter the lifting path of the lifting platform 10.

  Therefore, when the lifting platform 10 is lowered in such a positioning state, the lower surface of the lifting platform 10 abuts against the receiving roller 81 and swings the arm body 80 downward, whereby the push-down roller 84 and the ring-shaped body 65a. Thus, the outer cylinder 65 can be lowered with respect to the guide cylinder 64, so that the rear wheel 60 is lowered to land on the floor surface G. At this time, with respect to the arm body working length L from the axial center of the lateral pin 79 to the axial center of the receiving roller 81, the pushing-down working length l from the axial center of the transverse pin 79 to the axial center of the pressing roller 84 is Since it is short, that is, L> l, the arm body 80 performs a seesaw motion around the portion of the push-down roller 84 by the subsequent lowering (load) of the lifting platform 10.

  As a result, the rear portion of the side frame 2 is lifted via the horizontal pin 79 and the swing frame 62, and as shown in FIG. 15, the rubber pad 5 can be lifted and separated from the floor surface G. A traveling state supported by the pair of front wheels 40 and one rear wheel 60 can be made. At this time, the guide cylinder 64 is raised with respect to the outer cylinder 65.

  Further, as shown in FIG. 15, when the lifting platform 10 is lifted from the state where the rubber pad 5 is lifted and separated from the floor surface G, the arm 1 is loaded by the load on the vehicle body 1 as the lower surface of the lifting platform 10 is lifted. The body 80 performs a seesaw motion opposite to that described above with the pressing roller 84 as the center. At this time, the guide cylinder 64 is lowered with respect to the outer cylinder 65, thereby lowering the rear portion of the side frame 2. Then, as shown by the solid line in FIG. 16, when the lifting platform 10 is raised to a predetermined height, the rubber pad 5 can be lowered and landed on the floor G.

  Thereafter, the elevator 10 is moved upward to move away from the receiving roller 81 as indicated by the phantom line in FIG. 16. At this time, the rubber pad 5 is lowered and landed on the floor G, so that the vehicle body 1 can be in a braking state supported by a pair of left and right front wheels 40 and a pair of left and right rubber pads 5. Although the rear wheel 60 is in a grounded state, the braking state can be suitably maintained because the landing pressure by the rubber pad 5 is strong.

  A guard body 90 positioned at the full width in the left-right direction B is provided on the rear side of the lifting platform 10 (the opening for loading and unloading). The guard body 90 is divided into left and right parts, and the divided guard parts 91, 92 is connected to the lifting platform 10 side through the outer end side so as to be freely opened and closed. That is, one (right side) divided guard portion 91 located on the rear wheel 60 side is a plan view surrounding the side guard portion 91A located on the front and upper sides of the rear wheel 60 and the upper and rear sides of the riding portion 14. As a shape having a U-shaped central guard portion 91 </ b> B, the shape is long in the left-right direction B with respect to the other (left side) divided guard portion 92. At that time, one split guard portion 91 has a vertically oriented pipe body after pipe bodies bent and formed from the side guard portion 91A to the central guard portion 91B are arranged in two places (one or a plurality of places). It is connected via a connecting portion 91C consisting of

  Then, the end of the side guard portion 91A is connected to the vertical saddle portion of the rear portion of the handrail body 13 via the hinge 93, so that one divided guard portion 91 is connected to the handrail body 13 via the outer end side. That is, it is connected to the lifting platform 10 so as to be openable and closable in the lateral direction.

  Further, a vertical cylindrical body 94 whose lower end approaches the riding portion 14 is provided at the end of the central guard portion 91B, and a lock pin 95 is provided in the vertical cylindrical body 94 so as to be movable up and down. A lock lever 96 connected to the upper portion of the lock pin 95 projects outside through a guide groove 97 formed in the vertical cylinder 94. A lock portion 98 is formed on the left portion of the riding portion 14 so that the lower end of the lock pin 95 can be engaged when the one split guard portion 91 is closed. Thereby, one division guard part 91 is constituted so that it can be fixed to the platform 10 side in the closed posture. A locked portion 99 is provided at the upper end portion of the vertical cylindrical body 94. A lock detection means (such as a limit switch) 100 for detecting the lock lever 96 in the lock operation state is provided on the outer surface side of the vertical cylinder 94, and the lock detection means 100 is connected to the control means 38.

  The other split guard portion 92 has a pipe-like shape, and its outer end is connected to the vertical flange portion of the rear portion of the handrail body 13 via the pin 101 and the long hole 102, so that the handrail passes through the outer end side. It is connected to the body 13 so as to be openable and closable in the vertical direction with respect to the lifting platform 10 side. At the inner end of the other divided guard portion 92, a locking portion 103 that can be engaged with the locked portion 99 provided on the one divided guard portion 91 from above is provided. As a result, the other split guard 92 is configured to be freely disengaged from the one split guard 91 in the closed posture in the closed posture.

  The central guard portion 91B of one split guard portion 91 is provided with an ascending operation switch 105 and a descending operation switch 106. These operation switches 105 and 106 are in the form of push buttons and are connected to the control means 38. Yes.

  7 to 9, a rail-shaped guide body 110 is erected at a right position (or a left position) at the front portion of the vehicle body 1, and a rail which is guided by the guide body 110 and can be moved up and down. A shaped lifting member 111 is provided. An intermediate portion of the elevating member 111 is provided with a locking body 112 that is rotatable forward and laterally, and the locking body 112 rotates forward so that the upper surface of a truck bed or the like is rotated. It is configured to be able to contact from above. Further, a detecting body 113 extending rearward is connected to the elevating member 111.

  The detection body 113 operates a lifting platform detection means (such as a limit switch) 114 provided on the lifting platform 10 that has been lifted, and the lifting platform detection means 114 is connected to the control means 38. At that time, the lifting / lowering table detecting means 114 on the lifting / lowering platform 10 side that has moved up comes into contact with the detection body 113 to detect and move, so that the lifting movement by the hydraulic lifting / lowering device 20 is stopped.

  At the front end portion of the floor plate portion 11 in the lift 10, a rectangular plate-like transition body 115 that is long in the left-right direction B is provided so as to be rotatable around a left-right axis. That is, the base end of the crossover body 115 is connected to the front end portion of the floor plate portion 11 via the rotation connecting tool 116, and therefore between the forward lying side posture and the standing posture around the lateral axis. It is provided rotatably. A front / rear direction shaft 117 is rotatably provided at the upper part of the left side plate portion 12 of the elevator platform 10, and a rotation operation lever 118 is provided at the rear end of the front / rear direction shaft 117. In addition, a link mechanism 119 is provided between the front end of the front-rear shaft 117 and the crossover body 115 to raise and cross the crossover body 115 by forward and reverse rotation of the front-rear direction shaft 117.

  Therefore, the transition body 115 can be rotated around the axis in the left-right direction via the link mechanism 119 by rotating the front-rear direction shaft 117 forward and backward via the rotation operation lever 118. At that time, the transition body 115 can be lifted and lowered without being affected by the truck bed by rotating it to a standing posture, and the lower surface of the front portion is raised with respect to the truck bed by rotating it to the sideways position. It is comprised so that contact is possible.

Next, the effect | action which concerns on the basic composition of the manual travel lifter mentioned above is demonstrated.
For example, in order to load the load carrier vehicle K storing the load N on the truck bed Т, the manual travel lifter at the storage location is driven to the unloading location. When this travel is performed, as shown in FIGS. 7, 9, 10, and 15, the front wheels 40 are directed in the front-rear direction A, and the rear wheels 60 are close to the riding section 14 (on the platform 10). It is located rearward) and faces in the front-rear direction A. Further, the lift 10 is lowered to lift and separate the rubber pad 5 from the floor G, so that the vehicle body 1 is supported by a pair of left and right front wheels 40 and a single rear wheel 60.

  Further, the guard body 90 closes the one split guard portion 91 and then fixes the lock pin 95 to the lifting platform 10 by engaging the lower end of the lock pin 95 with the lock portion 98 and closes the other split guard portion 92. After moving, the latching portion 103 is engaged with the latched portion 99 to be connected to the one divided guard portion 91 side. Then, the operation lever 72 is switched to the horizontal posture to release the braking on the rear wheel 60. The locking body 112 is lowered and rotated in the left-right direction. Furthermore, the transition board 115 is rotated to the standing posture.

  In this state, the center guard portion 91B of one split guard portion 91 is gripped with the left hand, the operation grip 73 of the operation lever 72 is gripped with the right hand, and a pushing force is applied via the left hand, thereby allowing manual travel. The lifter can be moved forward, and the manual lifter can be driven backward by applying a pulling force via the left hand.

  During such forward and backward traveling, the inner cylinder 66 is rotated (rotated) with respect to the guide cylinder 64 via the operation lever 72 as shown by the imaginary line C in FIG. The rear wheel 60 can be turned left and right around the axis 67a, that is, the rear wheel 60 can be turned right and left at a portion directly below the longitudinal axis 67a. It can be easily performed without being moved, and the moving operation at the time of turning can be performed lightly and easily. Further, since it is not swung, it is possible to easily run straight (straight) back and forth, and therefore it is easy to run in a narrow space and to stop the fixed position (fixed posture) of the loading and unloading work with respect to the truck bed.

  At this time, as shown in FIG. 15, since the lifting platform 10 is locked to the protrusion 82, unexpected swinging on the swinging frame 62 side can be prevented. In addition, the push-down roller 84 rolls on the ring-shaped body 65a for turning the rear wheel 60. Before and after this, as shown in FIG. 7, the truck is stopped at a fixed position for loading and unloading work, and the truck bed Т is open at the rear.

  In this manner, after the manual travel lifter is loaded and unloaded and traveled to the target position of the work place and stopped, first, as shown in FIGS. 15, 16, and 17A, the operation lever 72 is moved. By switching to the standing posture and lowering the brake bar 75 via the brake rod 74, the brake body 76 is pressed against the rear wheel 60 from above, thereby braking the rear wheel 60. Then, the electric cord is connected, and with the switch on, the raising operation switch 105 is turned on in a state where the control means 38, the electric motor 36, etc. are energized, and the hydraulic lifting device 20 is lifted to raise the lifting platform 10. At this time, the rear wheel 60 is braked, so that the lifting platform 10 can be raised stably.

  The lifting of the lifting platform 10 is stopped by releasing the switch when the lifting platform 10 is separated from the receiving roller 80 as shown by the phantom line in FIG. Thus, the vehicle body 1 can be in a strong braking state in which the pair of left and right front wheels 40 and the pair of left and right rubber pads 5 are supported.

  Next, the operation lever 72 is switched to the sideways posture, and as shown in FIG. 17B, the brake bar 75 is raised via the spring 77 to release the braking on the rear wheel 60. Then, the swing lever 62 is swung around the vertical pin 63 by pulling the operating lever 72 that has been switched to the horizontal posture to apply a swing force to the swing frame 62, and the virtual frame shown in FIG. As indicated by the line, the receiving roller 81 is moved outward from the lower side of the lifting platform 10, and the rear wheel 60 is moved rearward of the right side frame 2 outside the lifting platform 10. In this state, the lowering operation switch 106 is turned on, and the hydraulic lifting device 20 is lowered to lower the lifting platform 10, thereby landing on the floor G as shown in FIGS. 8 and 11.

  Next, after the other divided guard portion 92 is swung upward around the pin 101 to disengage the locking portion 103 from the locked portion 99, the other divided guard portion is inserted through the elongated hole 102. 92 is moved to the outside so that the locking part 103 is positioned above the locked part 99 and the other split guard part 92 is swung downward around the pin 101 to be in the open position. Thereafter, the lock pin 95 is lifted via the lock lever 96, and in a state where the engagement with the lock portion 98 is released, the one split guard portion 91 is swung outwardly about the hinge 93, so that FIG. As shown in the phantom line, FIG. At this time, since the divided guard portion 91 is one of the divided card bodies 90, the space for the outward swing may be narrow.

  In this state, the operator gets on the lifting platform 10 and raises the locking body 112 together with the lifting member 111 so that the locking body 112 is positioned above the truck bed Т. As shown by the phantom line in FIG. 7, after rotating on the truck bed Т, it is lowered and locked on the truck bed Т as shown by the phantom line in FIG. Next, the worker pushes the load transport vehicle K to be loaded on the floor surface G, and moves onto the floor plate portion 11 through the transition inclined surface 11a as shown in FIG.

  Then, by one operation reverse to the above, one split guard 91 is closed and locked, and the other split guard 92 is closed and engaged with one split guard 91. As a result, as shown in FIG. 13, the guard body 90 can be in a closed posture, but such an operation is performed in a state where the operator gets into the riding section 14. In addition, the lock posture of one of the divided guard portions 91 is detected by the lock detection means 100, which allows the operation by the operation switches 105 and 106.

  Next, the ascending operation switch 105 is turned on, and the lifting mechanism 10 is raised by raising the hydraulic lifting device 20. At this time, the rubber pad 5 is lowered and landed on the floor surface G, and the vehicle body 1 is in a strong braking state supported by the pair of left and right front wheels 40 and the pair of left and right rubber pads 5, so that the lifting platform 10 is lifted. It can be performed stably without any misalignment.

  And the raising / lowering table detection means 114 by the side of the raising / lowering table 10 contact | abuts from the downward direction with respect to the detection body 113, and when this raising / lowering table detection means 114 carries out a detection motion, the raising movement by the said hydraulic lifting apparatus 20 is carried out. Can stop automatically. Thereby, the floor board part 11 can be made into the level similar to the truck bed Т.

  Next, the front / rear direction shaft 117 is rotated via the rotation operation lever 118, and the transition body 115 in the standing posture is rotated around the left / right direction axis 116 a via the link mechanism 119 to be in the sideways posture. Then, as shown by the phantom line in FIG. 7, the front lower surface is brought into contact with the truck bed T from above. Thereby, it can be set as the state which passed the crossing body 115 between the upper surfaces of the floor board part 11 and the truck bed T. In this state, the operator on the boarding unit 14 pushes the luggage transport vehicle K to travel, so that the cargo transport vehicle K on the floor board 11 can be transferred onto the truck bed T via the transition body 115. Then, the luggage carrier K on the truck bed T is run on the truck bed T and aligned.

  The elevator 10 that has been emptied by the above-described transfer is lowered by the lowering movement by the hydraulic elevator 20 after reaching the standing position via the rotation operation lever 118, and reaches the lower limit. As described above, it may be in a state of being stopped at the target position of the loading / unloading place. Therefore, by repeating the operation as described above, the load transport vehicle K can be transferred onto the truck bed T one after another.

  At that time, the level of the truck bed T gradually lowers due to the change (increase) in the number of the load transport vehicles K loaded on the truck bed T, that is, the loading load. To do. On the other hand, as the level of the truck bed T is lowered, the locking body 112 is automatically lowered by the weight of the elevating member 111 and the like, and the detection body 113 is lowered integrally therewith, The stopping position on the lifting platform 10 side can be automatically adjusted to the level of the truck bed T, so that there is a gap with respect to the truck bed T on the front lower surface of the transition body 115 that is turned sideways by turning. It can abut without occurring.

  Normally, the width of the truck bed T can be loaded with a plurality of rows of cargo carriers K. Therefore, by moving the manual lifter with respect to the truck bed T in the width direction, a plurality of rows can be aligned and loaded. It will be easy to do. Thus, in order to displace the manual travel lifter in the width direction, first, as shown in FIGS. 7, 9, and 10, the front wheel 40 is directed in the front-rear direction A and the rear wheel 60 is ridden. It is located near the portion 14 (behind the lifting platform 10) in the front-rear direction A, and the lifting platform 10 is positioned at the lower limit, and the rubber pad 5 is lifted and separated from the floor G to release the braking. 1 is returned to the runnable state supported by the pair of left and right front wheels 40 and one rear wheel 60.

  In this state, first, of the pair of left and right operation levers 45 facing rearward, one of the operation levers 45 is grasped and rotated to the laterally outward direction. As a result, the wheel support 42 is rotated by 90 degrees around the longitudinal axis 42a via the longitudinal member 44, so that one of the front wheels 40 that has been oriented in the front-rear direction A is changed in the left-right direction B. Can do. At this time, the rotation of one longitudinal member 44 is transmitted to the other longitudinal member 44 through one arm 48, the connecting bar 49, and the other arm 48, and the other wheel support 42 is moved in the opposite direction. The other front wheel 40 that has been turned 90 degrees and thus turned in the front-rear direction A can be changed in the left-right direction B.

  In this way, the direction of the rear wheel 60 is also changed before and after changing the direction of the front wheel 40. That is, first, the operation lever 72 is switched to the sideways posture to release the braking on the rear wheel 60. Next, the operation lever 72 is gripped and rotated in the laterally outward direction. As a result, the wheel support 67 can be rotated 90 degrees around the longitudinal axis 67a via the inner cylinder 66, so that the rear wheel 60 that has been oriented in the front-rear direction A can be redirected to the left-right direction B. .

  As a result, as shown in FIG. 18, the front wheel 40 and the rear wheel 60 are changed in the left-right direction B, and then the lateral force is applied to the manual traveling lifter to cause the truck carrier T to move laterally. On the other hand, the manual travel lifter can be displaced laterally. Thereafter, the front wheels 40 and the rear wheels 60 are changed in the front-rear direction A, so that the initial state of stopping at a fixed position (fixed posture) of the loading / unloading work with respect to the truck bed T can be obtained.

Next, a restraining mechanism and restraining function for restraining the movement of the load transport vehicle, which is the gist of the present invention, will be described with reference to FIGS.
The manual travel lifter shown in FIGS. 1 to 6 is the manual travel lifter shown in FIGS. 7 to 18 showing the basic configuration described above, and a part of the configuration is, for example, the shape of the handrail 13. Specifically, in the shape of the handrail body 13 in a side view, an inverted U-shape (FIGS. 7 to 18) is changed to a P-shape (FIGS. 1 to 6) will be described. Of course, instead of the handrail body in the manual travel type lifter shown in FIGS. 1 to 6, the handrail body of the manual travel type lifter shown in FIGS. 7 to 18 may be used.

  As shown in FIG. 1 and FIG. 2, the column member from the front side of the both side plate portions 12 of the lifting platform 10, in other words, the cargo entry / exit opening on the opposite side (predetermined) side of the guard body 90, that is, the transition body 115 side. 121 is erected, and a movement restraining member 122 of a load carrier having a U-shape in a plan view is swingable in a vertical plane via a horizontal mounting shaft 123 at the upper end portions of both support members 121. Is provided. More specifically, the movement restraining member 122 is bent (extended) by 90 degrees from the horizontal bar portion 122a and both ends of the horizontal bar portion 122a, and the end portions thereof are provided on the respective column members 121. The arm portion 122b is attached to the attachment bracket 124 via the horizontal attachment shaft 123. In addition, the intermediate part of the said support | pillar member 122 is supported by the handrail body 13 side via the support tool (fastening components, such as a volt | bolt and a nut, are used) 125.

  Further, an intermediate portion of one (here, the right side) arm portion 122b of the movement restraining member 122 and an appropriate portion of the intermediate portion of the column member 121 are connected via a gas spring 126 (an example of an elastic member). Yes. Of course, you may attach the gas spring 126 to both arm parts 122b. The gas spring 126 is connected to the arm portion 122b and the column member 121 by connecting shafts 129 and 130 via mounting brackets 127 and 128 provided on the gas spring 126, respectively. It is arranged outside the movement restraining member 122 so as not to get in the way.

  The gas spring 126 has, for example, a free piston disposed in a piston-side cylinder chamber of a single rod type fluid pressure cylinder, and a through hole, that is, an orifice is formed in the piston portion of the piston rod disposed in the cylinder chamber. The cylinder chamber in which the piston rod partitioned by is filled with hydraulic oil and the compressed gas is disposed in the cylinder chamber opposite to the piston rod partitioned by the free piston. The pressure acting on the piston part of the piston rod is the same as the pressure acting on the free piston, so that the piston rod can be stopped at any position, and the moving speed of the piston rod is controlled by the orifice. . In short, since the spring constant is small, a substantially constant spring force can be obtained over a wide range of strokes.

  Further, regarding the stroke (length) of the gas spring 126, when the gas spring 126 is extended, the horizontal bar portion 122a of the movement restraining member 122, that is, the arm portion 122b is at a predetermined angle α (for example, about 5 to 30 degrees) with respect to the horizontal plane. Within a range of preferably 30 degrees). More specifically, the upward posture of the horizontal bar portion 122b at a predetermined angle α is a restraining posture capable of restraining the movement of the load transport vehicle K, and a posture swinging downward from the horizontal plane [for example, 0 to about 90 degrees. Is in a posture capable of avoiding a collision with a roof portion (an example of an obstacle) of the truck bed T described later (including a case where there is a possibility of damage due to contact). And in the restraining attitude | position which can restrain a movement, it is the height (size) which the luggage carrier K can pass under the horizontal bar part 122a. Further, the horizontal bar portion 122a is positioned above the truck bed (loading / loading surface of the load transporter) T at the lowered position of the lifting platform 10. Furthermore, the upper swing limit (that is, the restraining posture) of the movement restraining member 122 is set to the near side of the extension limit on the gas spring side. That is, a stopper member 132 is provided at the upper end portion of the support member 121 to prevent the movement restraining member 122 from swinging upward from a predetermined restraining posture via the mounting bracket 131. The stopper member 132 is configured to come into contact with the end portion of the arm portion 122b of the movement restraining member 122.

  By the way, about the avoidance posture which can avoid the collision with the roof part of the truck bed T in the movement restraining member 122 when the raising / lowering platform 10 raises too much, extension force (biasing force of the extension direction) is applied to the gas spring 126. Even in some cases, consideration is given so as not to return to the truck bed T, that is, the roof side. In short, the posture in which the gas spring 126 is most contracted is an avoidance posture (hereinafter also referred to as an initial avoidance posture) that can reliably avoid a collision with the roof portion.

  Here, the horizontal attachment shaft 123 to the support member 121 of the movement restraining member 122 capable of adopting this initial avoidance posture, the connecting shaft 129 to the movement restraining member 122 of the gas spring 126, and the column member 121 of the gas spring 126 to the support member 121. The positional relationship of the connecting shaft 130 will be described.

  That is, as shown in FIG. 3, in the initial avoidance posture (i) of the movement restraining member 122, a horizontal attachment shaft (attachment shaft position, indicated by point a) 123 to the support member 121 of the movement restraining member 122 and A connecting shaft (connecting shaft position to the movement stopping member 122 of the gas spring 126 on a line d connecting a connecting shaft (connecting shaft position, indicated by point c) 130 to the support member 121 of the gas spring 126, 129) (indicated by point b) is located, that is, the points a, b and c are arranged in a straight line.

  Therefore, as shown by the solid line in FIG. 3, the connecting shaft 129 of the gas spring 126 to the movement restraining member 122 is behind the line d connecting the horizontal mounting shaft 123 and the connecting shaft 130 of the gas spring 126 to the support member 121 ( When it is located on the lifting platform side, even if the extension force of the gas spring 126 is applied, the moment M acting on the movement restraining member 122 is directed backward by the biasing force of the gas spring 126 (in FIG. 3, Counterclockwise), even when the lifting platform 10 descends after the lifting platform 10 rises and exceeds the roof portion of the truck bed T, the movement restraining member 122 is always located behind the roof portion and is always in the avoidance posture ( B) and will not collide with the roof.

  According to this configuration, as shown in FIG. 4A, after the actual load carrier K is placed on the lifting platform 10 and moved to the truck loading platform T, the lifting platform 20 is used to move the lifting platform 10 to the truck loading platform. Loading can be performed by lifting up to T and moving (running) the load transport vehicle K onto the truck bed T. Of course, since the movement restraining member 122 is always in the restraining posture when loading onto the truck bed T, the movement from the lifting platform 10 to the truck bed T can be performed without any trouble.

  Then, as shown in FIG. 4 (b), after loading the cargo transport vehicle K, the lifting platform 10 is kept in a lowered state (lowering position). Since the horizontal bar portion 122a is located slightly above the truck bed T, even if, for example, the already loaded luggage carrier K moves to the end of the truck bed T and is likely to fall from the truck bed T. It can be stopped by the horizontal bar portion 122a. Of course, the fall of the operator who works on the truck bed T can also be stopped (prevented). In other words, the loading operation of the load transport vehicle K onto the truck bed T can be performed safely.

  By the way, when loading the cargo transport vehicle K, as shown in FIG. 5, with the horizontal bar portion 122a of the movement restraining member 122 protruding forward, for example, the lifting platform 10 is lifted too much so that the movement restraining member 122 becomes a truck bed. When contacting the roof portion R of T, a downward pressing force acts on the movement restraining member 122, but the movement restraining member 122 assumes a downward avoidance posture due to the contraction operation of the gas spring 126, and the movement restraining member 122. Will not be damaged.

  Further, as shown in FIGS. 6A to 6B, the lifting platform 10 is further lifted as shown in FIG. 6C in a state where the movement stopping member 122 is in contact with the roof portion R of the truck bed T. As a result, the gas spring 126 contracts, and the movement restraining member 122 is always in the avoidance posture in which it is removed from the roof portion R of the truck bed T from the initial avoidance posture. And as shown in FIG.6 (d), in the always avoiding attitude | position, since the attitude | position is kept, the movement stopping member 122 is prevented from colliding with the roof part R even when the lifting platform 10 is lowered. Is done.

  In the embodiment described above, the operation of loading the actual cargo transport vehicle K onto the truck bed T has been described. However, the operation of loading the empty cargo transport vehicle K onto the truck bed T can be performed in the same manner. In addition, by moving the lifting platform 10 up and down in the same manner, the work of lowering the actual or empty cargo transport vehicle K on the truck loading platform T to the floor G side can be performed in the same manner. Furthermore, the operation of directly loading and unloading a resin container, a cardboard box, and the like on the truck bed T without using the load transport vehicle K can be performed in the same manner by manually transferring the lift table 10.

It is a front perspective view of the manual travel type lifter concerning an embodiment of the invention. It is a rear perspective view of the manual traveling lifter. It is a principal part side view explaining the attachment state of the movement stopping member which concerns on the modification of the manual travel type lifter. It is a side view explaining the loading operation | work by the same manual travel type lifter. It is a side view explaining the loading operation | work by the same manual travel type lifter. It is a side view explaining the loading operation | work by the same manual travel type lifter. It is a whole top view which shows the basic composition of the manual travel lifter. It is a front view which shows the basic composition of the manual travel lifter. It is a side view at the time of driving | running | working in the lifter which concerns on the same basic composition. It is a partially notched rear view at the time of driving | running | working in the lifter which concerns on the same basic composition. It is a side view at the time of landing in the lifter concerning the basic composition. It is a partially cutaway rear view at the time of loading in the lifter which concerns on the same basic composition. It is a partially cutaway rear view at the time of completion of loading in the lifter according to the same basic configuration. It is a principal part disassembled perspective view of the lifter which concerns on the same basic composition. It is a partially notched rear view at the time of driving | running | working in the rear-wheel part of the lifter which concerns on the basic structure. It is a partially notched rear view at the time of landing in the rear wheel portion of the lifter according to the same basic configuration. The rear wheel portion of the lifter according to the same basic configuration, (a) is a partially cutaway side view at the time of braking, and (b) is a partially cutaway side view at the time of braking release. It is a top view at the time of traversing in the wheel part of the lifter which concerns on the same basic composition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body 10 Lifting stand 11 Floor board part 12 Side board part 13 Handrail body 14 Riding part 20 Hydraulic lifting device 21 Outer mast 23 Inner mast 27 Lifting body 31 Lift cylinder 40 Front wheel 60 Rear wheel 90 Guard body 111 Lifting member 115 Transition body 121 Strut member 122 Movement restraining member 122a Horizontal bar portion 122b Arm portion 123 Horizontal mounting shaft 126 Gas spring 129 Connecting shaft 130 Connecting shaft A Front-rear direction B Left-right direction G Floor surface K Luggage carrier Т Truck loading platform

Claims (3)

A frame body having traveling wheels on the bottom, a lifting platform guided by a guide mechanism provided on the frame body side so as to be movable up and down, a lifting device for lifting the lifting platform, and standing on at least both sides of the lifting platform. And a lifter capable of raising and lowering at least a load transport vehicle,
The column members are erected on both sides of a predetermined cargo entry / exit opening portion of the lifting platform, and the column members are provided at the upper portions of both column members and at both ends of the horizontal bar portion. A movement-stopping member of a U-shaped luggage carrier vehicle having a U-shape in plan view, which is formed of an arm portion attached to a horizontal attachment shaft on a vertical plane,
In addition, a telescopic member that can be stretched with a predetermined stroke is attached across the movement restraining member and the column member, and the restraining posture by the horizontal bar portion of the moving restraining member is at least horizontal than the mounting position by the horizontal mounting shaft. A manually operated lifter characterized in that the bar portion is in the upper position. When the movement restraining member comes into contact with an obstacle from below due to the lift of the elevator, the movement restraining member swings downward to avoid the collision.
The connecting shaft to the movement restraining member of the expansion / contraction member is configured to be positioned on the lifting platform side from the line connecting the attachment shaft position of the movement stopping member to the support member and the connecting shaft position of the expansion / contraction member to the support member,
2. The manual operation according to claim 1, wherein the avoidance posture is maintained even when an extension force is applied to the telescopic member after the movement restraining member comes into contact with the obstacle and assumes an avoidance posture. Traveling lifter.   The manual travel lifter according to claim 1 or 2, wherein a gas spring is used as the expansion and contraction member.

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