JP2006069421A - Low lift - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low lift capable of reducing burden of a worker in height adjustment of a front receiving base. <P>SOLUTION: The low lift is provided with a vehicle body 2 provided with a drive wheel 1; a fork 4 liftably provided on a front surface side of the vehicle body 2 and having the front receiving base 80 for receiving a front part of a grand piano P and a rear receiving base 74 for receiving a rear part of the grand piano P; a fork lifting device 6 for lifting the fork 4; a support arm 51 erectably/fallably provided on a distal end of the fork 4, erected by a push rod 54 interlocked with lifting of the fork lifting device 6 in ascending of the fork 4 and fallen in descending of the fork 4; and a load wheel 5 provided on the support arm 51. The front receiving base 80 is constituted by a receiving base lifting device 83 provided on the fork 4; and a receiving base member 81 provided ascendably to a usage position and descendably to a stand-by position by the receiving base lifting device 83. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a low lift used for transporting a transported object in, for example, a factory or a warehouse.

A conventional example of low lift will be described with reference to FIGS. Since this low lift is described in Patent Document 1, only an outline will be described. 6 is a side view showing the low lift with the fork lowered, FIG. 7 is a side view showing the low lift with the fork raised, and FIG. 8 is a perspective view showing the fork lifting device of the low lift. The left and right of the low lift are the left and right viewed from the operator (driver) of the low lift.
As shown in FIG. 6, the low lift L is composed of a pair of left and right forks 4 that are parallel to each other so that a vehicle body 2, a load (so-called luggage) can be loaded, and a pair of left and right fork that raises and lowers each fork 4 relative to the vehicle body 2. Fork lifting device 6.
A drive wheel 1 and an auxiliary wheel 12 are provided at the lower end of the vehicle body 2. The drive wheel 1 causes the low lift L to travel (forward and backward) by the rotational drive of a traveling electric motor (not shown) installed in the vehicle body 2. Further, the drive wheel 1 can be steered by an operation handle 10 protruding on a cover member 11 that covers the rear side (left side in FIG. 6) of the vehicle body 2.

As shown in FIG. 8, the fork elevating devices 6 are incorporated in the vehicle body 2 symmetrically. Since each fork elevating device 6 has the same structure, one of the fork lifting devices 6 (right side) will be described mainly, and the description of the other side (left side) will be omitted. The fork elevating device 6 includes an elevating electric motor 61 as a driving source, a screw shaft 62 that rotates about the axis by the elevating electric motor 61, and a screw screwed by rotation of the screw shaft 62. And a nut member 63 that moves in the axial direction along the shaft 62.
A base member 64 is attached to the lifting electric motor 61.
The screw shaft 62 is rotatably supported by a bearing 65 that is integral with the base member 64. The screw shaft 62 is coupled to an output shaft (not shown) of the lifting electric motor 61 via a gear mechanism (not shown) provided in the base member 64 so as to be interlocked. Therefore, by rotating the lifting electric motor 61 in the forward direction or the reverse direction, the screw shaft 62 is rotated forward or reverse around the axis.

The bearing 65 is pivotally supported via a support shaft 22 with respect to a support bracket 21 provided at the center of the back wall (rear wall) of the vehicle body 2.
A battery B and a control box C are installed in the vehicle body 2. The battery B supplies electric power to the drive electric motor for the drive wheel 1, the lift electric motor 61, and the like. In the control box C, various control circuits (not shown) for controlling the drive electric motor for the drive wheel 1, the lifting electric motor 61, and the like, a charging circuit for the battery B (not shown), and the like are incorporated. ing.

A bearing plate 41 is fixed to the base end portion (rear end portion) of the fork 4. Between the bearing plates 41 of both the forks 4, a horizontal shaft 42 made of a round bar is installed. Both ends of the horizontal shaft 42 are supported by both bearing plates 41 so as to be relatively rotatable.
A base end portion (rear end portion) of a pair of left and right lift arms 3 is pivotally supported by a support shaft 31 at a lower portion of the vehicle body 2. The lift shaft 3 is fixed to the front end portions (front end portions) of the lift arms 3 with the horizontal shaft 42 inserted therethrough. Therefore, the horizontal shaft 42 is moved up and down by the rotation of the lift arm 3 and moves both the forks 4 up and down.

  At the center of the horizontal shaft 42, a base end portion of a first connecting arm 43 forming a pair of left and right is fixed in a fitted state. The distal ends of the first connecting arms 43 are connected to the nut member 63 so as to be rotatable by a support shaft 44. Further, the horizontal shaft 42 is fixed in a state in which the base ends of the pair of left and right second connection arms 45 positioned between the lift arms 3 and the first connection arms 43 are fitted. Has been. A proximal end portion (rear end portion) of the push rod 54 is rotatably connected to the distal end portions of the second connection arms 45.

  On the base end portion (rear end portion) of the fork 4, a vertical wall-like back plate 46 that covers the front side of the vehicle body 2 is erected. One end portion (front end portion) of a pair of left and right link arms 7 parallel to the lift arm 3 is pivotally supported by a support shaft 72 at the upper portion of the back plate 46. Further, the other end portions (rear end portions) of the link arms 7 are pivotally supported on the vehicle body 2 by a support shaft 71.

A bearing 47 provided at the tip of the fork 4 is pivotally supported by a support shaft 53 at a portion near the base end of the support arm 51. The support arm 51 can stand and fall with respect to the tip of the fork 4 by rotating around the support shaft 53. The road wheel 5 is rotatably supported by the axle 52 at the tip of the support arm 51. The road wheel 5 can roll on the ground R (see FIGS. 6 and 7) such as a road surface or a floor surface regardless of the lift position of the fork 4.
Further, a front end portion of a push rod 54 extending along each fork 4 is rotatably connected to a base end portion (an end portion on the side opposite to the load wheel 5) of the support arm 51 by a support shaft 55. Further, the rear end portion of the push rod 54 is rotatably connected to the tip end portion of the second connecting arm 45 by a support shaft 48 (see FIGS. 6 and 7).

  In the above-described low lift L, when the fork 4 is lifted from the lowered position (see FIG. 6), the nut member 63 is rotated forward by the forward drive of the lifting electric motor 61 so that the nut member 63 is screwed. (See FIG. 7). The nut member 63 lifts the horizontal shaft 42 via the first connecting arm 43. The horizontal shaft 42 is moved upward around the support shaft 31 of the lift arm 3 and raises both forks 4. At this time, since the parallel link mechanism is configured by the vehicle body 2, the lift arm 3, the link arm 7, and the back plate 46, the back plate 46 rises while holding the standing posture as the fork 4 rises. Further, when the fork 4 is raised, the second connecting arm 45 on the horizontal shaft 42 moves the push rod 54 forward as the horizontal shaft 42 rotates counterclockwise in FIG. 6 with respect to the bearing plate 41. Extrude. As a result, as the support shaft 55 at the front end of the push rod 54 is pushed forward, the support arm 51 is turned around the support shaft 53 to stand up, so that the front end portion of the fork 4 maintains a horizontal posture. While being raised. At this time, the road wheel 5 rolls on the ground surface R. Further, the lift arm 3 comes into contact with an upper limit stopper 8a provided on the vehicle body 2, and the lifting electric motor 61 is stopped by the operation of a limit switch (not shown) attached to the upper limit stopper 8a. Is stopped at the raised position (see FIG. 7).

When the forks 4 are lowered from the raised position (see FIG. 7), both the forks 4 are lowered by reverse operation of the screw shaft 62 by rotating the screw shaft 62 in reverse by the reverse drive of the lifting electric motor 61. And the back plate 46 is lowered while maintaining the standing posture. Further, when the fork 4 is lowered, the push rod 54 is pulled back by the second connecting arm 45 and the support arm 51 is laid down, so that the tip of the fork 4 is lowered while maintaining the horizontal posture. At this time, the road wheel 5 rolls on the ground surface R. Further, the lift arm 3 comes into contact with a lower limit stopper 8b provided on the vehicle body 2, and the lifting electric motor 61 is stopped by the operation of a limit switch (not shown) attached to the lower limit stopper 8b. Is stopped at the lowered position (see FIG. 6).
JP 2001-138922 A

  The above-described conventional low lift L (see FIGS. 6 to 8) may be used for transporting a grand piano in a piano manufacturing factory, for example. FIG. 9 is a right side view showing the low lift to which the attachment for carrying the grand piano is additionally set in the lowered state of the fork, and FIG. 10 is a right side view showing the low lift in FIG. 9 in the raised state of the fork. In addition, parts that are considered to be the same or substantially the same configuration and equivalent configuration as the low lift L illustrated in the prior art (see FIGS. 6 to 8) are denoted by the same reference numerals, and the fork lifting device in the vehicle body 2 is provided. Most of the components according to 6 are omitted.

  As shown in FIG. 9, on the base end portion (left end portion in FIG. 9) of the fork 4, there is a rear receiving stand 74 that is a base receiving member for receiving the keyboard side lower surface Pb of the piano body P <b> 1 of the grand piano P. Additional settings have been made. Further, on the front end portion of the fork 4, a front receiving table 76 that is a front end receiving member for receiving the main body side lower surface Pa of the piano main body P 1 of the grand piano P is set. In general, the lower surface of the piano main body P1 of the grand piano P is a stepped surface having a keyboard side lower surface Pb and a main body side lower surface Pa located on the opposite side of the keyboard and on the upper side of the keyboard side lower surface Pb. .

When the grand piano P is transported, as shown in FIG. 9, the front pedestal 76 of the fork 4 in the lowered position with respect to the lower space S of the piano body P1 of the grand piano P is on the keyboard side (FIG. 9). In the left side). For this reason, the front pedestal 76 must be set to a height 76 h that can pass through the keyboard-side lower surface Pb of the piano body P1 of the grand piano P.
In order to lift the grand piano P in the lower space S of the piano main body P1 of the grand piano P, as shown in FIG. It is necessary to adjust the height to 76H corresponding to. For this reason, conventionally, a spacer 77 for height adjustment is placed on the front receiving table 76.

  Incidentally, in the case of the low lift L, the lift stroke of the fork 4 is small, so that the keyboard-side lower surface Pb of the piano body P1 of the grand piano P and the receiving surface of the rear cradle 74 at the lowered position of the fork 4 (see FIG. 9). The distance d2 between the main body side lower surface Pa of the piano body P1 and the receiving surface 77a on the spacer 77 of the front receiving base 76 is set to be smaller than the lifting stroke of the fork 4. There is a need to. Further, as shown in FIG. 10, in order to lift the grand piano P in the horizontal state of the piano body P1, the distances d1 and d2 (see FIG. 9) need to be set to substantially the same value.

In addition, when the fork 4 is pulled out from the lower space S of the piano body P1 of the grand piano P after the grand piano P is transported to a predetermined place, the spacer 77 on the front pedestal 76 is also lowered. Since the spacer 77 interferes with the stepped vertical surface Pc between the main body side lower surface Pa and the keyboard side lower surface Pb of the piano main body P1, the The spacer 77 had to be removed from the cradle 76.
As described above, in the conventional low lift L, when the grand piano P is transported, it is necessary to place the spacer 77 on the front receiving table 76 or to remove it from the front receiving table 76. There was a problem that the burden was large. In general, since the spacer 77 is made of wood and is as heavy as about 8 kg, the burden on the operator is further increased.

  The problem to be solved by the present invention is to provide a low lift capable of reducing the burden on the operator for adjusting the height of the front cradle.

The above-mentioned problem can be solved by a low lift having the gist of the configuration described in the claims.
That is, according to the low lift according to claim 1 of the claims, when the fork is inserted into and extracted from the lower space of the transported object, the receiving member of the front receiving table is lowered to the standby position by the receiving device lifting device. Thus, interference of the cradle member with the transported object can be avoided. Further, with the fork inserted into the lower space of the transported article, the front part of the transported article can be received by raising the receiving member of the front receiving base to the use position by the receiving base lifting device. Therefore, it is possible to reduce the burden on the operator for adjusting the height of the front cradle.

Moreover, according to the low lift which concerns on Claim 2 of a claim, a stand member can be raised / lowered, maintaining a substantially horizontal state, by the standing-up and fall operation | movement of the parallel link mechanism which makes the main body of a stand raising / lowering apparatus. For this reason, the cradle member can be lifted and lowered without causing interference with the transported object.
Further, by providing the parallel link mechanism on the fork so as to be able to fall down, the parallel link mechanism can be compactly stored on the fork in the standby state of the receiving member.

  Further, according to the low lift according to claim 3 of the claims, the parallel link mechanism is erected when the fork is raised, and the parallel link mechanism is laid down when the fork is lowered by the interlocking member interlocked with the raising and lowering of the fork lifting device. The Therefore, the parallel link mechanism can be automatically raised and laid down without requiring a dedicated drive source for operating the parallel link mechanism.

Further, according to the low lift according to claim 4, the main body side receiving surface of the receiving member is lowered to the standby position by lowering the receiving member to the standby position by the receiving device elevating device of the front receiving device. It can be made substantially the same as the keyboard side receiving surface of the piano body or lower than the receiving surface. For this reason, the front base on the fork interferes from the keyboard side of the piano body to the keyboard side lower surface with respect to the lower space of the piano body of the grand piano where the lower surface of the piano body is located on the upper side of the lower surface of the keyboard side. It can be inserted or pulled out in reverse.
Moreover, the main body side receiving surface of the receiving member is raised to a height corresponding to the lower surface of the main body side of the piano body of the grand piano by raising the receiving member to the use position by the receiving base lifting device of the front receiving base. Can do.
Therefore, when carrying the grand piano, it is possible to omit the spacer attaching / detaching work that has been required in the past, reducing the burden on the operator for adjusting the height of the front cradle and improving the efficiency of carrying the grand piano. Can be improved.

  According to the low lift of the present invention, the front lift is provided by the cradle lifting device provided on the fork and the cradle member provided by the cradle lifting device so that it can be raised to the use position and lowered to the standby position. By configuring the base, it is possible to reduce the burden on the operator for adjusting the height of the front base.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the following examples.

  Examples of the present invention will be described. A present Example demonstrates the low lift used for conveyance of the grand piano (refer FIG. 1) in a piano manufacturing factory. 1 is a right side view showing the low lift when the fork is lowered, FIG. 2 is a right side view showing the low lift when the fork is raised, FIG. 3 is a right side view showing the front stand in the standby state, and FIG. FIG. 5 is a perspective view showing the low lifter fork lifting device. FIG. In addition, the basic configuration of the low lift of the present embodiment is almost the same as the low lift L (see FIGS. 6 to 8, 9, and 10) exemplified in the above-described conventional technology. Parts that are considered to be the same or substantially the same configuration and equivalent configuration as the technology are denoted by the same reference numerals, and redundant description is omitted. 1, 2, and 5, most of the components related to the fork lifting device 6 in the vehicle body 2 are omitted as in FIGS. 9 and 10.

  As shown in FIG. 5, the fork elevating device 6 of the low lift L according to the present embodiment is configured to elevate both forks 4 by one elevating electric motor 61, reducing the number of parts and reducing the number of assembling steps. The cost is reduced by the reduction. In other words, the distal ends of both first connecting arms 43 can be rotated by the support shaft 44 with respect to both sides of the nut member 63 screwed to the screw shaft 62 rotated about the axis by the lifting electric motor 61. It is connected. Other configurations are the same as those of the low lift L (see FIGS. 6 to 8) exemplified in the conventional technique. A bellows is formed between the base member 64 attached to the lifting electric motor 61 and the nut member 63 so as to cover the screw shaft 62 and be able to expand and contract following the vertical movement of the nut member 63. A boot 67 is attached.

Further, as shown by a two-dot chain line P in FIG. 1, the grand piano P has a piano body P1 and two left and right keyboard sides (only one is shown in FIG. 1) that horizontally supports the piano body P1. A support leg P2 and one anti-keyboard side support leg P3 are provided. Further, the lower surface of the piano main body P1 of the grand piano P has a keyboard side lower surface Pb of the piano main body P1 and a main body side positioned on the upper side of the keyboard side lower surface Pb on the counter keyboard side (right side in FIG. 1) of the piano main body P1. The step surface has a lower surface Pa. A stepped vertical surface Pc is formed between the main body side lower surface Pa and the keyboard side lower surface Pb.
In the present specification, for convenience of explanation, the keyboard side (left side in FIG. 1) of the piano body P1 received at the base (rear) of the fork 4 of the low lift L is referred to as the rear, and the keyboard side portion is referred to as the rear. . Further, the non-keyboard side (right side in FIG. 1) of the piano body P1 received at the tip (front) of the fork 4 is referred to as the front side, and the keyboard side portion is referred to as the front part. Accordingly, the keyboard side support legs P2 are referred to as “rear legs”, and the anti-keyboard side support legs P3 are referred to as “front legs”.

Since the components attached to the left and right forks 4 (only one side is shown in FIG. 1) of the low lift L that carries the grand piano P are provided symmetrically, the configuration on the right side will be described. The description of the configuration on the left side is omitted.
As shown in FIG. 1, on the base end portion of the fork 4, a rear support 74 for receiving the rear portion (left side (keyboard side portion) in FIG. 1) of the grand piano P is a conventional technique (see FIGS. 9 and 9). Additional settings are made in the same manner as in FIG. The rear pedestal 74 has a substantially rectangular shape, and the lower surface thereof is coupled to the fork 4 and the rear side surface is coupled to the back plate 46. The upper surface of the rear pedestal 74 is a keyboard-side receiving surface 74a that can receive the keyboard-side lower surface Pb of the piano body P1 of the grand piano P.

  Further, on the front end portion of the fork 4, a front receiving stand 80 for supporting the front portion of the grand piano P (the right side (reverse keyboard side portion in FIG. 1)) is set. The front cradle 80 is provided with a cradle lifting device 83 provided on the fork 4, and can be raised to the use position shown in FIG. 2 and lowered to the standby position shown in FIG. 1 by the cradle lifting device 83. The cradle member 81 is formed. The receiving member 81 is made of, for example, wood and has a rectangular parallelepiped shape, and the upper surface thereof is a main body-side receiving surface 81a.

As shown in FIG. 2, the cradle lifting device 83 is mainly composed of a parallel link mechanism 84 that can stand on the tip of the fork 4 and can fall on the fork 4 as shown in FIG. It is configured as.
As shown in FIG. 3, the parallel link mechanism 84 includes a support plate 85, a first link arm 86, a second link arm 87, and a lift plate 88.
The support plate 85 has a substantially trapezoidal plate shape when viewed from the side of the low lift L, and is erected on the tip of the fork 4.
Further, the lower end portion of the first link arm 86 is connected to the center portion of the support plate 85 so as to be rotatable in the front-rear direction by the first support shaft 91. The upper end portion of the first link arm 86 is connected to the rear portion (left portion in FIG. 3) of the lifting plate 88 so as to be rotatable in the front-rear direction by the second support shaft 92.

  The lower end portion of the second link arm 87 is connected to the support plate 85 by a third support shaft 93 so as to be rotatable in the front-rear direction. The upper end portion of the second link arm 87 is connected to the front portion (right portion in FIG. 3) of the elevating plate 88 by a fourth support shaft 94 so as to be rotatable in the front-rear direction. The third support shaft 93 is located near the front upper side (upper right in FIG. 2) of the first support shaft 91, and the fourth support shaft 94 is located in front of the second support shaft 92 (right side in FIG. 2). Way) It is located near. Further, the first link arm 86 is formed in a wide shape, and the second link arm 87 is formed in a narrow shape so as to overlap with one side of the first link arm 86 (the back side in FIG. 3). ing.

  Further, as described above, the elevating plate 88 is rotatable at the upper end portions of the first link arm 86 and the second link arm 87 by the second support shaft 92 and the fourth support shaft 94. It is connected. On the elevating plate 88, a frame 89 having a channel shape and a substantially horizontal posture is coupled. The pedestal 90 is fitted in the base frame 89 in a fitted state. On the pedestal 90, the receiving member 81 is coupled in a substantially horizontal state.

The parallel link mechanism 84 can raise and lower the cradle member 81 while maintaining a substantially horizontal posture by standing and lying down, and cradle on the fork 4 as shown in FIG. Is held at the standby position which is the lowered position, and as shown in FIG. 4, the stand member 81 is held at the use position which is the raised position by standing on the tip of the fork 4.
Specifically, when the parallel link mechanism 84 is erected from the lying state, the first link arm 86 rotates about the first support shaft 91 (specifically, the clockwise direction in FIG. 3), and the second link The arm 87 rotates about the third support shaft 93 (specifically, the clockwise direction in FIG. 3). At the same time, the elevating plate 88 rotates about the second support shaft 92 (specifically, counterclockwise in FIG. 3) and rotates about the fourth support shaft 94 (specifically, counterclockwise in FIG. 3). Move. Thereby, the raising / lowering plate 88, the base frame 89, the base 90, and the base member 81 are raised while moving forward while maintaining a substantially horizontal posture (see FIG. 4).
Further, when the parallel link mechanism 84 is lowered from the standing state, the first link arm 86 rotates about the first support shaft 91 (specifically, the counterclockwise direction in FIG. 4), and the second link arm 87 rotates around the third support shaft 93 (specifically, the counterclockwise direction in FIG. 4).
At the same time, the elevating plate 88 rotates about the second support shaft 92 (specifically, the clockwise direction in FIG. 4) and rotates about the fourth support shaft 94 (specifically, the clockwise direction in FIG. 4). Move. Thereby, the raising / lowering plate 88, the base frame 89, the base 90, and the base member 81 are lowered | hung while moving back, maintaining a substantially horizontal attitude | position (refer FIG. 3).

  Further, the parallel link mechanism 84 has the main body side receiving surface 81a higher than the keyboard side receiving surface 74a when the cradle member 81 is in the use position, as shown in FIG. When the cradle member 81 is in the standby position, the cradle member 81 is set so that the main body side receiving surface 81a is substantially the same as the keyboard side receiving surface 74a or lower than the receiving surface 74a. Raise and lower. As shown in FIG. 1, the main body side receiving surface 81a of the cradle member 81 in the standby position can pass through the keyboard side lower surface Pb of the piano main body P1 of the grand piano P by the forward or backward movement of the low lift L. It is sufficient if the height is set so that it can pass through.

Further, the parallel link mechanism 84 is linked to a push rod 54 that is interlocked with the lifting and lowering of the fork lifting device 6 (see FIG. 5) via an operating rod 98 described below. As shown in FIG. 2, the fork 4 is raised when the rod 54 is pushed forward, and is laid down as shown in FIG. 1 when the push rod 54 is pulled back. The push rod 54 corresponds to the “interlocking member” in this specification.
That is, the rear end portion (lower end portion in FIG. 3) of the operating rod 98 is connected to the front end portion of the push rod 54 so as to be rotatable using the support shaft 55. Further, the front end portion (upper end portion in FIG. 3) of the operating rod 98 is connected to the first link arm 86 so as to be rotatable by a fifth support shaft 95. As shown in FIG. 2, in the standing state of the parallel link mechanism 84, the first link arm 86 and the second link arm 87 are substantially vertical so that the support rigidity of the grand piano P with respect to the piano body P <b> 1 is achieved. Improvements are being made.

  Next, a procedure for transporting the grand piano P by the low lift L configured as described above will be described. As shown in FIG. 1, when the fork 4 is in the lowered position, the support arm 51 is in the lying down state and the parallel link mechanism 84 is in the lying down state, and the receiving member 81 of the front receiving stand 80 is in the standby position. It is in. In this state, the main body side receiving surface 81a of the receiving member 81 of the front receiving table 80 is substantially the same as or lower than the keyboard side receiving surface 74a of the rear receiving table 74. Therefore, when the grand piano P is transported, the low lift L is run, and the front pedestal 80 of the fork 4 in the lowered position is moved from the keyboard side to the both keyboard side support legs with respect to the lower space S of the piano body P1 of the grand piano P. When inserted between the rear legs P2, the front pedestal 80 can pass under the keyboard side lower surface Pb of the piano body P1 of the grand piano P, and the front pedestal 80 can be passed through the grand piano. Interference with P can be avoided.

  As the low lift L advances, the front pedestal 80 and the rear pedestal 74 together with the fork 4 are inserted into the lower space S of the piano body P1 of the grand piano P, and the back plate 46 is brought closer to the keyboard side of the grand piano P. In the state, the low lift L is stopped (see FIG. 1). In this state, the keyboard-side receiving surface 74a of the rear receiving table 74 faces the keyboard-side lower surface Pb of the piano body P1 of the grand piano P, and the body-side receiving surface 81a of the receiving member 81 of the front receiving table 80. Is opposed to the lower surface Pa on the main body side of the piano main body P1 of the grand piano P.

In this state, when the fork 4 is lifted from the lowered position (see FIG. 1) by the fork elevating device 6, the push rod 54 is pushed forward, whereby the support arm 51 is rotated around the support shaft 53 and raised. The Thereby, the keyboard side receiving surface 74a of the rear receiving stand 74 abuts on the keyboard side lower surface Pb of the piano body P1 of the grand piano P, and the rear part of the grand piano P is lifted.
Further, as the fork 4 is raised, the operating rod 98 is pushed forward by the push rod 54 via the support shaft 55, whereby the parallel link mechanism 84 connected via the fifth support shaft 95 is raised. The Thereby, as a result of the cradle member 81 being raised to the use position while maintaining a substantially horizontal state, the main body side receiving surface 81a of the cradle member 81 abuts on the main body side lower surface Pa of the piano main body P1 of the grand piano P, Lift the front of the grand piano P.

  In this way, the grand piano P (see FIG. 2) lifted on the fork 4 of the low lift L is in a state in which the rear legs P2 and the front legs P3 are floated on the ground surface R, and the predetermined level is obtained by running the low lift L. It is transported to the place.

Then, in a state where the low lift L is stopped at a predetermined location, when the fork 4 is lowered from the raised position (see FIG. 2) by the fork lifting device 6, the push rod 54 is pulled back, whereby the support arm 51 is It is turned around the support shaft 53 and laid down.
As a result, as shown in FIG. 1, on the keyboard side of the grand piano P, as the fork 4 is lowered, the rear part of the grand piano P is lowered and the rear leg P2 is grounded on the ground R, The keyboard side receiving surface 74a of the cradle 74 is separated from the keyboard side lower surface Pb of the piano body P1 of the grand piano P.
Further, on the side opposite to the keyboard of the grand piano P, as the fork 4 is lowered, the operating rod 98 is pulled rearward by the push rod 54 via the support shaft 55, so that the fifth support shaft 95 is provided. The linked parallel link mechanism 84 is laid down. As a result, the cradle member 81 is lowered to the standby position while maintaining a substantially horizontal state. As a result, the front part of the grand piano P is lowered, and the front leg P3 comes into contact with the ground R, and then the rear cradle 74 The keyboard-side receiving surface 74a is separated from the keyboard-side lower surface Pb of the piano body P1 of the grand piano P.

  In this way, when the grand piano P is lowered to a predetermined place, the front lift 80 and the rear support 74 are moved together with the fork 4 by moving the low lift L backward, so that the space below the piano main body P1 of the grand piano P. Just pull out from S. Also at this time, the main body side receiving surface 81a of the receiving member 81 of the front receiving base 80 is substantially the same as or lower than the keyboard side receiving surface 74a of the rear receiving base 74. For this reason, the front pedestal 80 can pass through under the keyboard side lower surface Pb of the piano body P1 of the grand piano P, and the front pedestal 80 is prevented from interfering with the grand piano P. Can do.

  According to the low lift L described above, when the fork 4 is inserted into and removed from the lower space of the transported article, the receiving member 81 of the front receiving table 80 is lowered to the standby position by the receiving table lifting device 83 as shown in FIG. By doing so, interference of the cradle member 81 of the front cradle 80 with respect to the grand piano P can be avoided. Further, in the state where the fork 4 is inserted into the lower space S of the piano body P1 of the grand piano P, the receiving member 81 of the front receiving stand 80 is raised to the use position by the receiving lift device 83 as shown in FIG. By this, it becomes possible to receive the front part of the grand piano P. Therefore, it is possible to reduce the burden on the operator for adjusting the height of the front receiving base 80.

Further, the stand member 81 can be lifted and lowered while maintaining a substantially horizontal state by the standing and lying down operation of the parallel link mechanism 84 that forms the main body of the stand lifting device 83. For this reason, the cradle member 81 can be moved up and down without interfering with the grand piano P.
Further, by providing the parallel link mechanism 84 on the fork 4 so as to be able to fall down, the parallel link mechanism 84 can be compactly stored on the fork 4 in the standby state of the receiving member 81 (see FIGS. 1 and 3). ).

  Further, the push rod 54 interlocked with the raising and lowering of the fork lifting device 6 raises the parallel link mechanism 84 when the fork 4 is raised, and the parallel link mechanism 84 is tilted when the fork 4 is lowered. Therefore, the parallel link mechanism 84 can be automatically raised and laid down without requiring a dedicated drive source for operating the parallel link mechanism 84.

Further, by lowering the receiving member 81 to the standby position by the receiving lift device 83 of the front receiving stand 80, the main body side receiving surface 81a of the receiving member 81 is received by the keyboard side receiving of the piano main body P1 of the grand piano P. It can be made substantially the same as the stop surface 74a or lower than the receiving surface 74a. For this reason, the receiving member 81 of the front receiving stand 80 on the fork 4 with respect to the lower space S of the piano main body P1 of the grand piano P in which the main body side lower surface Pa of the piano main body P1 is located above the keyboard side lower surface Pb. Can be inserted from the keyboard side of the piano body P1 without interfering with the keyboard side lower surface Pb, or can be pulled out in reverse.
Further, the cradle member 81 is raised to the use position by the cradle elevating device 83 of the front cradle 80, so that the main body side receiving surface 81 a of the cradle member 81 becomes the main body side lower surface of the piano main body P 1 of the grand piano P. It can be set to a height corresponding to Pa.
Therefore, when carrying the grand piano P, it is possible to omit the attaching / detaching work of the spacer 77 (see FIGS. 9 and 10), which has been conventionally required, so that the burden on the operator for adjusting the height of the front pedestal 80 is reduced. This can reduce the efficiency of carrying the grand piano P.

  The present invention is not limited to the above-described embodiment, but can be modified without departing from the gist of the present invention. For example, the low lift L of the present invention is not limited to the transportation of the grand piano P, and can be widely applied to the transportation of articles (conveyed objects) forming a lower space into which the forks 4 can be inserted. Moreover, in the said Example, although the parallel link mechanism 84 was connected with the push rod 54 interlock | cooperated with the raising / lowering of the fork raising / lowering apparatus 6, the exclusive drive means (for example, an electric motor, an electric cylinder) for operating the parallel link mechanism 84 was connected. Etc.) is also conceivable. Moreover, in the said Example, although the parallel link mechanism 84 was used, using a pantograph type link mechanism is also considered. Further, as the cradle lifting / lowering device 83, a gear mechanism, a screw mechanism, a cam mechanism, or the like may be employed instead of the parallel link mechanism 84. In addition, the height of the body-side receiving surface 81a of the receiving member 81 when the parallel link mechanism 84 is standing and lying down can be appropriately changed according to the height of the lower surface of the transported item.

It is a right view which shows the low lift which concerns on one Example of this invention in the fall state of a fork. It is a right view which shows the low lift of FIG. 1 in the raising state of a fork. It is a right view which shows a front stand in a standby state. It is a right view which shows a front stand in use condition. It is a perspective view which shows the fork raising / lowering apparatus of a low lift. It is a right view which shows the low lift concerning a prior art example in the raising state of a fork. It is a right view which shows the low lift of FIG. 6 in the raising state of a fork. It is a perspective view which shows the fork raising / lowering apparatus of the low lift of FIG. It is a right view which shows the low lift in which the attachment for carrying a grand piano was additionally set by the fork descending state. It is a right view which shows the low lift of FIG. 9 in the raising state of a fork.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive wheel 2 Car body 4 Fork 5 Road wheel 6 Fork raising / lowering device 51 Support arm 54 Push rod (interlocking member)
74 Rear cradle 74a Keyboard side receiving surface 80 Front receiving table 81 Receiving member 81a Main body side receiving surface 83 Receiving device lifting device 84 Parallel link mechanism L Low lift P Grand piano (carrying material)
Pa Body side lower surface Pb Keyboard side lower surface

Claims (4)

A car body with a drive wheel,
A fork provided on the front side of the vehicle body so as to be movable up and down and receiving a front part of a transported object and a rear base receiving a rear part of the transported object;
A fork lifting device for lifting and lowering the fork;
A support arm that is provided at the tip of the fork so as to be raised and lowered and interlocked with the raising and lowering of the fork lifting device, and is raised when the fork is raised and is lowered when the fork is lowered;
A low lift comprising a load wheel provided on the support arm,
The front cradle is configured by a cradle lifting device provided on the fork, and a cradle member provided by the cradle lifting device so that it can be raised to a use position and lowered to a standby position. Features a low lift. The low lift according to claim 1,
The pedestal lifting device is mainly composed of a parallel link mechanism that can stand on the tip of the fork and that can fall on the fork. The low lift according to claim 2,
The parallel lift mechanism is linked to the interlocking member so as to be interlocked, and is configured to be raised by the interlocking member when the fork is raised and fallen when the fork is lowered. The low lift according to any one of claims 1 to 3,
The rear cradle has a keyboard-side receiving surface capable of receiving the keyboard-side lower surface of the piano body of the grand piano that is the transported item,
The cradle member of the front cradle has a main body side receiving surface capable of receiving a lower surface on the main body side positioned on the upper side of the lower surface on the keyboard side on the opposite side of the piano main body of the grand piano,
The cradle lifting device is configured such that when the cradle member is in the use position, the main body side receiving surface is made higher than the keyboard side receiving surface, and when the cradle member is in the standby position, the main body side A low lift, characterized in that the receiving member is raised and lowered so that the receiving surface is substantially the same as or lower than the keyboard-side receiving surface.

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