JP4035485B2 - Truck elevating ladder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lifting ladder for a truck that is used while standing against a required portion of a truck bed.
[0002]
[Prior art]
Conventionally, truck-specific ladders for workers to go up and down the truck bed and to carry small packages from the truck bed for work on the truck bed have not been known. Therefore, for raising and lowering at the truck bed, an ordinary ladder is used in which a pair of struts are horizontally mounted at a predetermined interval on a pair of both sides.
[0003]
[Problems to be solved by the invention]
Use a normal ladder as it stands against a required part of the truck bed, for example, a roll outer plate attached to the load bed (there is a side roll outer plate on the left and right sides and a rear roll outer plate on the rear side) In this case, since the ladder is easy to slip from the rolling board, other workers other than the worker who goes up and down the ladder have to hold the ladder, which is very troublesome.
[0004]
In view of the above-mentioned problems, the present invention does not slip even when leaning against the upper end of the outer cover plate of the truck bed, the handrail attached on the upper cover plate, or the load base part in the state where the cover outer plate is tilted. It is an object of the present invention to provide a lifting ladder for a truck that can be self-held safely without any trouble.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 is a truck elevating ladder that is used by leaning on a required portion of a truck bed portion 5 and has a pair of struts 1 and 1 placed on both sides of a pair of struts 1 and 1 at a predetermined interval. The ladder main body 3, the handrail 4 attached to the pillar 1 at least on one side of the ladder main body 3, and the upper pillars 1 and 1 of the ladder main body 3 are provided on the upper side of the ladder main body 3. The handrail 4 is composed of a handrail main body 14 and a handrail support 15, and a use posture standing upright with respect to the ladder main body 3 and a ladder main body 3 that is folded from the use posture. The lower end portion of the handrail support column 15 is pivotally attached to the support column 1 so that the posture can be freely changed to a storage posture that overlaps with the support column. That is, a pivot mounting bracket 22 is provided on the outer surface of the support column 1. Attached, the bracket 22 is A square tubular portion 23 for fitting the handrail strut portion is formed in which the lower end portion of the handrail strut portion 15 is slidably fitted from the lower end portion on the back side to the upper end portion on the opening side, and the opening of the square tubular portion 23 is formed. Notch openings 25a and 25b are formed in the side upper end portion, and the side plate portion 23c of the rectangular tube-shaped portion 23 has a long hole 26 for inserting a bolt in the longitudinal direction from the lower end on the back side to the upper end on the opening side. On the other hand, at the lower end of the handrail support column 15, a bolt for bolts 29 that is slidably inserted in the longitudinal direction from the lower end on the back side to the upper end on the opening side is attached to the bolt insertion long hole 26. When the pivoting bolt 29 is positioned at the lower end on the back side of the bolt insertion long hole 26, the lower end of the handrail support column 15 is fitted into the rectangular tubular portion 23 of the pivoting bracket 22. The handrail 4 is suspended from the ladder body 3 In this case, the handrail 4 is locked in its use state by the locking means 31 provided on the pivot mounting bracket 22, and the pivot bolt 29 is inserted into the bolt insertion length. When the hole 26 is located at the upper end on the opening side, the housing is folded from the use posture and overlaps the ladder main body 3 in parallel through the notch openings 25a and 25b formed on the upper end on the opening side. It is characterized by a posture.
[0007]
Claim 2 is the truck lifting ladders according to claim 1, and Kaketomegu 6, rotatable turning plate 10 pivotally mounted at one end portion to the post 1, the tip of the turning plate 10 When the ladder main body 11 and the ladder main body 3 are in the leaning posture with a predetermined inclination angle θ, the hook main body 11 and the rotating plate 10 protrude forward from the support column 1. It comprises a latching position holding means 12 that holds the latching position, and a retracting position holding means 13 that holds the latching tool main body 11 and the rotating plate 10 in the retracted position retracted to the column 1 side. .
[0008]
Claim 3 is the lifting ladder for trucks according to claim 1 or 2 , wherein each support column 1 of the ladder body 3 is composed of a support column body 7 and an expansion / contraction member 8 connected to a lower end portion of the support column body 7 so as to be freely adjustable. It is characterized by being configured.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The most preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which the turn outer plate R of the truck bed 5 is tilted against the base end portion of the outer plate R. 2 is a perspective view of the lifting elevator A for trucks as viewed from the side, FIG. 2 is a perspective view of the lifting ladder A in the same state as viewed from the front, and FIG. The perspective view which looked at the raising / lowering ladder A used leaning up from the side surface side, FIG. 4: is the perspective view which looked at the raising / lowering ladder A of the state which folded the handrail 4 in the accommodation attitude | position from the front side. 5 is a side view of the lifting ladder A showing the use state at the time of the minimum contraction, FIG. 6 is a side view of the lifting ladder A showing the use state at the maximum extension, and FIG. 7A is shown in FIG. 5 or FIG. It is a partially expanded side view of the raising / lowering ladder A, The state which has the latching tool 6 in a latching position is shown, (b) is the II line sectional drawing of (a). 8 (a) is a side view similar to FIG. 7 (a) showing a state in which the handrail 4 is folded to the retracted position and the latching tool 6 is moved from the latching position to the retracted position, and FIG. (a) is a cross-sectional view of the roll line, and (c) is an end view as seen from (a) c.
[0010]
As can be seen from these figures, this truck lifting ladder A includes a ladder main body 3 in which a pair of struts 1 and 1 are mounted on both sides of a pair of struts 1 and 1 at required intervals, and one side of the ladder main body 3. A handrail 4 attached to the column 1 and a latch 6 provided on the upper side of each of the columns 1 and 1 of the ladder main body 3 and hooked on the hanging part of the loading part 5 of the truck T. The As can be seen from FIG. 6, each column 1 of the ladder body 3 includes a column body 7 and an expansion member 8 that is connected to the lower end portion of the column body 7 so that the expansion and contraction is freely adjustable. A grounding base 9 is pivotally attached to. Anti-slip is applied to the bottom surface of the grounding base 9.
[0011]
The handrail 4 includes a handrail main body 14 and a handrail support 15, and for example, as shown in FIGS. 1 to 3, the use posture standing upright with respect to the ladder main body 3 and the use posture as shown in FIG. 4. The lower end portion of the handrail support column 15 is pivotally attached to the support column 1 so as to be freely changeable to a storage posture that is folded from above and overlapped with the ladder body 3 in parallel.
[0012]
As can be seen from FIGS. 7 and 8, the latching tool 6 has a pivotable pivot plate 10 having one end pivotally attached to each column 1 of the ladder body 3, and a tip of the pivot plate 10. When the fixed L-shaped latch main body 11 and the ladder main body 3 are in a standing posture with a predetermined inclination angle θ (for example, 60 °) as shown in FIGS. The latching position holding means 12 holds the latching position protruding horizontally forward from the support column 1, and the retracted position holding means 13 holds the latching tool body 11 at the retracted position retracted to the support column 1 side. . 1 to 4, the latch 6 is provided only at one position on the upper side of each column 1. However, as shown in FIGS. 5 and 6, the upper end of each column 1 and its lower side are provided. It can also be provided at two locations.
[0013]
The structure of the latch 6 will be described in more detail. As shown in FIGS. 7 and 8, the rotating plate 10 is formed in a parallelogram shape, and one end of the rotating plate 10 is pivoted on the outer surface of the support column 1. A substantially U-shaped notch groove 17 is formed in a projecting piece portion 10a projecting on the upper side of the free end side, and this notch groove 17 is hung by the hook body 11. When in the stop position, it becomes possible to engage with the butterfly bolt 18 attached to the substrate 19 fixed to the outer surface of the support column 1. Then, by tightening the butterfly bolt 18 in a state where the notch groove 17 is engaged with the butterfly bolt 18, the hook body 11 is horizontally moved forward from the column 1 as shown in FIG. It is held in the protruding latching position. The notch groove 17 and the butterfly bolt 18 constitute the latching position holding means 12.
[0014]
Further, the rotary plate 10 is formed with a substantially U-shaped cutout groove 20 on the lower side of the free end side, and this cutout groove 20 is formed on the other side of the same substrate 19 when the hook body 11 is in the retracted position. It becomes possible to engage with the butterfly bolt 21 attached to the point. Thus, by tightening the butterfly bolt 21 in a state where the notch groove 20 is engaged with the butterfly bolt 21, the hook body 11 is retracted to the column 1 side as shown in FIG. 8 (a). Hold in the retracted position. The cutout groove 20 and the butterfly bolt 21 constitute the retracted position holding means 13.
[0015]
Next, the structure of the handrail 4 will be described in more detail. The handrail 4 includes a rectangular frame-shaped handrail main body 14 composed of upper and lower horizontal rods 4a, 4b and 4c, left and right and intermediate vertical rods 4d, 4e and 4f, and a vertical rod 4e. , 4f and two handrail struts 15 extending integrally from each other, as shown in FIGS. 1 to 3, 5 and 6, the use posture standing upright with respect to the ladder body 3, and FIGS. As shown in FIG. 9, the lower end portion of each handrail strut portion 15 is pivotally attached to the strut 1 so as to be freely changeable in a stowed posture such that it is folded 90 ° from the use posture and overlaps the ladder main body 3 in parallel.
[0016]
As shown in FIG. 7, FIG. 11, and FIG. 12, a pivot bracket 22 is attached to the outer side surface of the column 1 at the lower pivot part of each handrail column 15. As can be seen from FIGS. 13A to 13D, the bracket 22 has a rectangular tube shape for fitting a handrail strut portion in which a lower end portion of the handrail strut portion 15 formed in a square tube shape is slidably fitted. Part 23 and mounting flange parts 24, 24 projecting to both sides along the bottom plate part 23b of the square tubular part 23. The square tubular part 23 is composed of an upper plate part 23a, a bottom plate part 23b, and left and right side plate parts. 23c, 23c.
[0017]
The square tubular portion 23 is formed with cutout openings 25a and 25b having opening areas corresponding to the cross-sectional areas of the hollow portions 23o of the square tubular portion 23 at one end portions of the upper plate portion 23a and the bottom plate portion 23b, respectively. ing. Further, in the left and right side plate portions 23c of the rectangular tube-shaped portion 23, bolt insertion long holes 26 are formed as shown in FIGS. 13 (b) and 13 (c).
[0018]
In order to attach the handrail support column 15 of the handrail 4 to the support column 1 by the pivot mounting bracket 22 having the structure as described above, first, the mounting flange portions 24 and 24 of each bracket 22 are attached to the support column 1 as shown in FIGS. Are fixedly attached to the predetermined positions by bolts 27 and nuts 28. Thus, as shown in FIG. 11, the handrail support column 15 is fitted into the hollow portion 23 o of the square tubular portion 23 of the bracket 22, and the left and right side plate portions 23 c and 23 c of the square tubular portion 23 are inserted through the bolts. A pivot bolt 29 is inserted from a long hole 26 to a bolt insertion hole (not shown) provided at the lower end of the handrail support column 15 and a nut 30 is attached to the tip.
[0019]
7 and 11 show a state where the pivot bolt 29 attached to the lower end portion of each handrail support column 15 is located at the lower end of the bolt insertion long hole 26 of the side plate portion 23c of the rectangular tube-shaped portion 23. Thus, the lower end portion of the handrail support column 15 is held by the hollow portion 23o of the rectangular tube-shaped portion 23, whereby the handrail 4 is held in a use posture standing upright with respect to the ladder body 3 as shown in the figure. . Thus, when the handrail main body 14 is pulled upward along the longitudinal direction of the handrail support column 15 from this use posture, the pivotal mounting bolt 29 of each handrail support column 15 is lowered along the bolt insertion slot 26. Since the bolt 29 is in contact with the upper end of the long hole 26, the handrail support 15 is pivoted at the lower end. As shown in FIGS. 4, 8, 9, 10, and 12, the handrail 4 is turned around the wearing bolt 29 and folded to be in a storage posture that overlaps the ladder main body 3 in parallel.
[0020]
Further, the handrail 4 is provided with a lock means 31 for locking the handrail 4 to a use posture standing upright. As shown in FIGS. 7 and 8, the locking means 31 penetrates the support column 1 at a position close to the pivotal mounting bracket 22, and a front end locking portion 32 a is provided on the upper plate portion 23 a of the rectangular tubular portion 23. It consists of a substantially L-shaped lock pin 32 that engages with a pin engagement hole (not shown) provided at the lower end portion of the handrail support column 15 from the pin hole 33 that is provided. The tip locking portion 32a is locked to the pin locking hole (not shown) of the handrail column 15 by a coil spring 36 interposed between the nut 35 and the column 1 screwed to the column. It is energized.
[0021]
Therefore, in the state where the handrail 4 is set in a use posture standing upright with respect to the handrail main body portion 14, the tip locking portion 32 a of the L-shaped lock pin 32 is moved from the pin hole 33 of the pivotal mounting bracket 22 to the pin of the handrail support column portion 15. By locking in the locking hole 34, the handrail 4 can be locked in the use posture. Further, when the handrail 4 is folded from the use posture to the storage posture, the L-shaped lock pin 32 is pulled outward against the urging force of the coil spring 36, and the tip locking portion 32a of the lock pin 32 is moved to the handrail support column portion. What is necessary is just to make it detach | leave from 15 said pin latching holes. In addition, what is necessary is just to provide the locking means 31 in the one pivot mounting bracket 22 side.
[0022]
The method of using the lifting ladder A for trucks having the above-described configuration will be described. In using the lifting ladder A, the handrail 4 is set in a usage posture perpendicular to the ladder main body 3 in the manner described above and locked. The use posture is held by means 31. Further, the latching tool 6 is set to a latching position that protrudes forward from the retracted position retracted to the column 1 side, and is held at the latching position by the latching position holding means 12.
[0023]
Thus, as shown in FIG. 1 and FIG. 2, when the lifting ladder A is leaned against the base end of the outer plate R in a state where the turn outer plate R of the truck bed 5 is tilted, the ladder main body 3 is used. , The hook body 11 of the hook 6 is pivotally attached to the loading platform 5 as shown in FIGS. 1, 5, and 6. What is necessary is just to hook on the base end part 37 of the turned outer plate R. At this time, since the height of the loading platform 5 varies depending on the size of the truck, the support 1 of the ladder body 3 is appropriately expanded and contracted so that the ladder body 3 is positioned at a predetermined inclination angle θ with respect to the ground G 6. The hook body 11 is set so as to be hooked to the base end portion 37 of the outer plate R.
[0024]
FIG. 5 illustrates a case where the elastic member 8 is used in a state of being contracted to a minimum with respect to the column main body 7 of the column 1. In this case, since the latching tool 6 is provided in the upper and lower two steps on the upper side of the support column 1, the latching tool 6 at any required height can be used. Further, FIG. 6 illustrates a case where the elastic member 8 is used in a state where it is extended to the maximum with respect to the column main body 7. Also in this case, the latching tool 6 in the required height in any one of the upper and lower two stages can be used as the latching tool 6.
[0025]
FIG. 3 exemplifies a case in which the turning outer plate R stands up with respect to the loading platform 5 and the lifting ladder A is used by leaning on the upper end portion of the handrail 38 erected on the turning outer plate R. In this case as well, the hook body 11 of the hook 6 can be hooked on the upper horizontal frame 38a of the handrail 38 while the ladder body 3 is tilted forward with respect to the ground G so as to have a predetermined inclination angle θ. That's fine.
[0026]
As described above, when the lifting ladder A is used by leaning on a required part of the truck bed 5, the latch 6 provided on the upper side of each of the columns 1, 1 of the ladder body 3 is used for the truck bed 5. 1, that is, in the example of FIG. 1, the base end portion 37 of the turning outer plate R, and in the example of FIG. 3, it is hooked on the upper horizontal frame 38 a of the handrail 38 and is self-held. 3 does not need to be held, and therefore, no extra workers are required to use the lifting ladder A, and the lifting ladder A can be used safely.
[0027]
Further, since the handrail 4 is attached to one side of the ladder main body 3 when the lifting ladder A is used, the operator can safely move up and down with respect to the loading platform portion 5 of the truck by the handrail 4. In this embodiment, the handrail 4 is attached only to the support column 1 on one side. However, the handrail 4 may be attached to the support columns 1 and 1 on both sides, so that safer use is possible. Moreover, in this embodiment, although the handrail 4 is installed only in the upper side area of the support | pillar 1, you may attach so that the full length of the support | pillar 1 may be covered.
[0028]
Further, the handrail 4 is used in a vertical posture with respect to the ladder main body 3 as illustrated in FIGS. 1 to 3 and is folded from this usage posture and overlaps the ladder main body 3 in parallel as shown in FIG. Since the posture can be changed to the storage posture, when the lifting ladder A is used, by folding the handrail main body portion 14 to the storage posture, the whole becomes compact, and the transportation of the lifting ladder A and Very convenient for storage.
[0029]
The latch 6 includes a pivotable pivot plate 10 having one end pivotally attached to the support column 1, and a substantially L-shaped latch body 11 fixed to the tip of the pivot plate 10. A latch position holding means 12 for holding the latch main body 11 and the rotating plate 10 in the latch position projecting forward from the column 1 when the ladder body 3 is in a leaning posture with a predetermined inclination angle θ; The main body 11 and the rotary plate 10 are composed of a retracted position holding means 13 for holding the main body 11 and the rotary plate 10 in the retracted position retracted to the support column 1 side. Since it can be held at the latching position by the latching position holding means 12, work safety can be achieved, and when the elevating ladder A is used, the latching tool main body 11 and the rotating plate 10 are held at the holding and retracting position holding means 13. Can be held in the retracted position, so that it can be hung when the operator is transporting the lifting ladder A. There is no danger of the tool body 11 being hooked on the operator's body or clothes, and safety in operation is achieved, and the latch tool body 11 and the rotating plate 10 may be rattled by vibration during transportation. Absent.
[0030]
【The invention's effect】
A lifting ladder for a truck according to a first aspect of the present invention is a ladder main body in which a pair of struts are horizontally mounted on a pair of both sides at a required interval, a handrail attached to a post on at least one side of the ladder main body, It is provided on the upper side of both struts, and consists of a hook that is hooked on the hanging part of the truck bed, and the hook is hooked on the hanging part of the truck bed and is self-held. Therefore, the operator does not need to hold the ladder main body, and therefore, an extra worker is not required for the use of the elevator ladder, and the elevator ladder can be used safely. Further, when the ladder is used, the handrail is attached to the ladder main body, so that the worker can safely move up and down with respect to the loading platform portion of the truck by the handrail.
[0031]
Further , according to the present invention , the handrail can be changed in posture between a use posture standing upright with respect to the ladder body and a storage posture in which the handrail is folded from the use posture and overlapped with the ladder body in parallel. When finished, folding the handrail main body portion into the storage posture makes the whole compact and convenient for transporting and storing the lifting ladder.
[0032]
According to the invention of claim 2 , during use of the elevating ladder, the latching tool body and the rotating plate can be held at the latching position by the latching position retaining means, so that work safety can be achieved. When the lifting ladder is used, the latch body and the rotating plate can be held at the retracted position by the holding / retracting position holding means. There is no danger of being caught on clothes or clothes, and it is safe, and there is no backlash between the latch body and the rotating plate due to vibration during transportation.
[0033]
According to the third aspect of the invention, each column of the ladder body is composed of the column body and the expansion / contraction member that is connected to the lower end of the column body so as to be adjustable. By appropriately extending and contracting the rack, the latching tool can be accurately hooked at the standing position of the truck bed at a position where the ladder main body has a predetermined inclination angle with respect to the ground, and the truck lifting ladder can be used safely.
[Brief description of the drawings]
FIG. 1 is a perspective view of a truck elevating ladder that is used by leaning against a base end of an outer plate in a state in which a turned outer plate of a truck bed is tilted, as viewed from the side.
FIG. 2 is a perspective view of the lifting ladder in the same state as viewed from the front side.
FIG. 3 is a perspective view of an elevating ladder used by leaning on an upper end portion of a handrail erected on a turn outer plate of a truck bed, as viewed from the side.
FIG. 4 is a perspective view of the elevating ladder in a state in which the handrail is folded in the storage posture, as viewed from the front side.
FIG. 5 is a side view of the elevating ladder showing a use state at the time of minimum contraction.
FIG. 6 is a side view of the elevating ladder showing the use state at the maximum extension.
7 (a) is a partially enlarged side view of the elevating ladder shown in FIG. 5 or FIG. 6 and shows a state in which the latching device is in the latching position, and (b) is an ea line of (a). It is sectional drawing.
8 (a) is a side view similar to FIG. 7 (a) showing a state in which the handrail is folded to the retracted position and the latch is moved from the latch position to the retracted position, and FIG. (C) is an end view as seen from (a) c.
FIG. 9A is a side view of the elevating ladder in a state in which the handrail is folded into the storage position, and FIG. 9B is a front view thereof.
10 is a partially enlarged front view of (b) of FIG. 9. FIG.
FIG. 11A is a front view showing a pivoting end portion of a handrail strut portion of a handrail in a use posture, and FIG. 11B is a knee line sectional view of FIG.
FIG. 12A is a front view showing a pivoting end portion of a handrail strut portion of a handrail in a storage position, and FIG.
13A is a front view showing a pivot bracket, FIG. 13B is a side view of the pivot bracket viewed from above, FIG. 13C is a side view viewed from below, and FIG. 13D is a view from right. FIG.
[Explanation of symbols]
A Lifting ladder 1 Post 2 Spade 3 Ladder body 4 Handrail 5 Truck loading platform 6 Latch 7 Strut body 8 Telescopic member 10 Rotating plate 11 Latch body 12 Retention position holding means 13 Retraction position holding means 14 Handrail body Part 15 Handrail support

Claims (3)

A lifting ladder for a truck that is used by leaning on a required part of the truck bed, and is attached to a pair of struts on both sides and a straddle horizontally at a required interval, and to a strut on at least one side of the ladder body. A lifting / lowering ladder for a truck, which is provided on the upper side of both pillars of the ladder main body and hooked to a hanging portion of the truck bed , and the handrail is a main body of the handrail. The lower end of the handrail strut can be freely changed to a use posture that stands vertically to the ladder body and a storage posture that is folded from the use posture and overlapped with the ladder body. A pivot mounting bracket is attached to the outer side surface of the column, and the bracket has a lower end portion of the handrail column portion that is open from the lower end portion on the back side. Up A rectangular tube-shaped portion for fitting a handrail strut portion that is slidably fitted over the portion is formed, a notch opening is formed at the upper end of the rectangular tube-shaped opening, and a side plate of the rectangular tube-shaped portion In the part, a long hole for bolt insertion is formed in the longitudinal direction from the lower end on the back side to the upper end on the opening side. On the other hand, on the lower end of the handrail post part, the long hole for bolt insertion is formed. When the pivot bolt is inserted so as to be slidable in the longitudinal direction from the opening side to the upper end of the opening side, and the pivot bolt is positioned at the lower end of the bolt insertion long hole, the lower end of the handrail support column Is fitted to the square tubular part of the pivotal mounting bracket, and the handrail is in a usage posture standing upright with respect to the ladder body. At that time, the railing is in the usage state by the locking means provided on the pivotal mounting bracket. Locked in When the pivot bolt is located at the upper end on the opening side of the bolt insertion elongated hole, the ladder main body is folded from its use posture through the notch opening formed in the upper end on the opening side. An elevating ladder for trucks that has a storage position that overlaps in parallel . The latch includes a pivotable pivot plate having one end pivotally attached to the column, a substantially L-shaped latch body fixed to the tip of the pivot plate, and a ladder body having a predetermined inclination. The latch position holding means for holding the latch main body and the rotating plate at the latching position protruding forward from the column when in the angle leaning posture, and the latch main body and the pivot plate are retracted to the column side. The lifting ladder for a truck according to claim 1 , further comprising a retracting position holding means for holding at the retracted position.   3. The lifting ladder for a truck according to claim 1, wherein each column of the ladder body includes a column body and an expansion / contraction member coupled to a lower end portion of the column body so as to be adjustable.

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