JP3890111B2 - Retreat stairs for truck loading / unloading - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to an ascending / descending step between a ground and a truck bed and a truck loading / unloading stairs used for an operator to evacuate a truck when loading / unloading an object to / from the truck. .
[0002]
[Prior art]
The truck bed has a rectangular bottom plate, left and right roof plates that can be opened and closed on the left and right sides, and a rear plate that can be opened and closed on the rear side of the bottom plate. Yes. When loading or unloading various objects that are relatively heavy due to crane operation or forklift operation on the loading platform, the operator may leave the loading platform while the crane is operating. This is preferable for ensuring the safety of the operator. However, when carrying out loading, after the operation of the crane is completed, the operator must perform the work on the loading platform in order to remove the wire hung on the conveyed object from the hook part of the crane. Don't be. Even when unloading, the worker must work to hang the wire on the object to be transported, and to climb the hook of the crane to the wire, and then the work must be lifted to complete the work. After that, since there is a possibility that the object to be transported may be inadvertently shifted on the loading platform by operating the crane, the worker must retreat from the loading platform for the safety of the worker.
[0003]
[Problems to be solved by the invention]
The work of loading and unloading the object to / from the loading platform is not completed by a single crane operation, and a plurality of crane operations are inevitable. For this reason, conventionally, an operator has to go up and down on the loading platform many times, which is complicated. Because of its complexity, if the worker remains on the bed when the crane is being operated, the worker is at risk.
[0004]
It is an object of the present invention to allow the object to be transferred to the loading platform so that it can be retracted to the outside of the loading platform when loading or unloading work is performed by a crane or the like and can easily enter the loading platform. It is intended to ensure the safety and ease of loading and unloading operations.
[0005]
The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.
[0006]
[Means for Solving the Problems]
Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
[0007]
The retraction stairs for truck loading / unloading of the present invention includes a lower frame member, an upper frame member positioned above the lower frame member, a support column connecting the lower frame member and the upper frame member, A staircase body that has a hook that is hooked to a rack plate of a truck bed, is detachably disposed outside the bed, and is provided on the upper frame member of the staircase body, and an operator retreats from within the bed A step board for evacuation to be used at the time of stepping, a step board for stairs provided on the lower frame member of the main body of the stairs and used when an operator ascends and descends between the ground and the step board for evacuation, and the stairs provided telescopically in the vertical direction on the struts of the main body, and a leg member for supporting on the ground the stairs body when the stairway body is hooked on the tilting plate of the loading platform by said hook, said stepped body Provided in the lower frame member, said stepped body and to be apart from the loading platform, and a plurality of casters for running the stairs body while being contract the leg members, the loading platform of the stairway body By moving to the outside of the loading platform and hooking the hook on the plate of the loading platform, the worker can ascend and descend on the loading platform, and the operator does not return to the ground when carrying the object to be conveyed to the loading platform. The retractable tread can be retracted.
[0008]
According to the present invention, the operator can use the stair tread to climb up and down the retreat tread, and can easily move onto the truck bed from the state where the worker has climbed the retreat tread. When a loading operation or an unloading operation is performed on the truck bed, the worker can stay on the evacuation step board and wait until the predetermined operation is completed without getting down to the ground. When the predetermined work is completed, it can be easily and quickly moved onto the loading platform from the position of the retraction tread.
[0010]
Further, in the present invention, the retreat stairs for truck loading / unloading can be moved to a predetermined position of the truck by a caster, and the stairs main body can be hooked on the rack plate of the truck at the predetermined position. Since the staircase body can be supported on the ground by the leg members, the staircase body may shake or bend when the worker retreats on the retreat tread or when climbing up and down using the stair tread. Is prevented.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0012]
FIG. 1 is a side view showing a state in which a retracting stairs for unloading a truck according to the present invention is attached to a truck bed. In the illustrated case, the retracting stairs 1 for unloading a truck is a platform 3 of a truck 2. The left side plate 4 is supported on the ground 5. FIG. 1 shows a state in which a transported object W is loaded on a loading platform 3 by a crane 6.
[0013]
FIG. 2 to FIG. 5 are enlarged views of the retracting stairs 1 for truck loading / unloading shown in FIG. As shown in the figure, the escape staircase 1 includes a frame body 10 constituting the staircase body. The frame 10 has a lower frame member 11 having a width dimension of D and a length dimension of L, and is positioned above the lower frame member 11 and has a width dimension similar to that of the lower frame member 11 and is long. The upper frame member 12 is set to be shorter than the lower frame member 11, and the upper and lower frame members 12 and 11 are connected by four support columns 13a to 13d. These struts 13 a to 13 d are located at the four corners of the upper frame member 12, the two struts 13 a and 13 b are located on the rear side of the lower frame member 11, and the two struts 13 c and 13 d are located on the lower frame member 11. Located in the center in the longitudinal direction.
[0014]
An intermediate frame member 14 is attached to the columns 13c and 13d, and the tip of the intermediate frame member 14 is supported on the lower frame member 11 by two columns 15a and 15b. Each of these members 11 to 15b is a hollow metal square member, and a frame 10 as a staircase body is formed by these members.
[0015]
The upper frame member 12 is provided with a retraction tread 16 used when an operator retreats from the loading platform 3 of the truck 2, and the lower frame member 11 and the intermediate frame member 14 are respectively connected to the ground 5 and the retreating plate. Stair treads 17 and 18 used when an operator ascends and descends between the treads 16 are attached. Each of the tread plates 16 to 18 is formed of a metal plate, and a number of anti-slip projections are formed on the surface thereof. However, an anti-slip rubber plate may be attached to this surface.
[0016]
Suspension members 21a and 21b made of a metal bar having an L-shaped cross section are attached to the columns 13b and 15b. 4 is provided. In addition, a contact member 23 that contacts the outer surface of the turn plate 4 is attached to each of the suspension members 21a and 21b while the hook 22 is hooked on the turn plate 4. Each of the two abutting members 23 is made of an elastic body such as rubber so that the scooping plate 4 is not damaged. Further, an elastic body such as rubber is attached to the inner surface of the hook 22 so that the wound plate 4 is not damaged.
[0017]
When the frame body 10 is hooked on the outside of the loading platform 3, as shown in FIG. 4A, the frame body 10 is attached to the loading platform 3 at the right side portion of the frame body 10 that is rectangular as viewed from above. It can be hooked.
[0018]
Socket members 24a and 24b made of hollow square members are fixed to the columns 13a and 13c, respectively, and rod-like leg members 25a and 25b slide vertically in the socket members 24a and 24b. It is attached to extend freely. A contact plate 26 is attached to the lower end surface of each leg member 25a, 25b. As shown in FIGS. 1 to 5, when the frame 10 is hooked on the loading platform 3 at the hook 22, the ground surface By applying the leg members 25a, 25b to 5, the frame body 10 is supported on the ground. This prevents the frame 10 from being shaken, deformed or bent when an operator is on each of the treads 16 to 18.
[0019]
A fastening screw member 27 is provided on the socket members 24a and 24b in order to fix the leg members 25a and 25b as predetermined expansion / contraction positions.
[0020]
In order to run the frame 10 with the frame 10 removed from the loading platform 3, two traveling wheels, that is, casters 28 are attached to the rear end portion of the lower frame member 11, and two wheels are attached to the front end portion. The support bar 29 is attached, and the lower end surface of the support bar 29 is substantially at the same position as the lower surface of the caster 28. Thus, when the frame body 10 is moved, the frame body 10 is tilted and the tip of the lower frame member 11 is lifted so that the respective support rods 29 are separated from the ground. 10 can be run.
[0021]
A handrail support 31a is provided integrally with the support 13a, a handrail support 31b is provided on the upper frame member 12 so as to be shifted inward from the side surface of the frame 10, and a handrail support 31c is provided integrally with the support 13c. Further, a handrail support 31d is provided at the left corner of the tip of the lower frame member 11. Handrails 32 are provided from the left side surface of the frame body 10 to the rear side portions at the upper end portions of the handrail support columns 31a to 31d. The handrail 32 is used for the safety of the operator when the worker ascends and descends the respective treads 16 to 18 and retreats on the retreat tread 16.
[0022]
Next, a procedure for loading the cargo to be transported W by operating the crane 6 on the loading platform 3 of the truck 2 using the retreat staircase 1 having such a structure will be described. As shown in FIG. 5, the retreat staircase 1 is housed in a predetermined position by a caster 28 and a support bar 29, and the frame 10 is inclined by the caster 28 toward the truck 2 on which a load is loaded. Will be moved.
[0023]
After moving to a predetermined position, the retreat staircase 1 is lifted by the operator, and the hook 22 is hooked on one of the rack plates 4 of the truck bed 3. Although FIG. 1 shows a state where it is hooked on the left side plate 4, any side plate or right side plate 4 may be used depending on the loading operation.
[0024]
In a state where the hook 22 is hooked on the cover plate 4, the fastening screw member 27 is loosened and the leg members 25 a and 25 b are pulled out until their tips contact the ground 5, and the fastening screw member 27 is tightened. As a result, the frame body 10 is arranged on the outside of the loading platform 3 with the hook 22 being supported on one side by the loading platform 3 and the other side being supported by the leg members 25a and 25b.
[0025]
When the worker ascends onto the retreating tread 16, the two-step stair treads 17, 18 are used, and the operator can easily rise to that position, and from there easily the loading platform 3. You can climb up to the top. Thus, the operation of removing the hook and the wire of the crane 6 can be performed in a state where the crane 6 is raised above the loading platform 3.
[0026]
On the other hand, when the transported object W is suspended by the operation of the crane 6 and moved onto the loading platform 3, in order to prevent the transported object W from inadvertently colliding with the worker, Retreat on the retreat tread 16 and wait until the movement is completed. The retreating operation only needs to straddle the roof plate 4 from the top of the loading platform 3 and can be easily retreated on the retreating foot plate 16.
[0027]
When a predetermined number of loads are loaded on the loading platform 3, the work on the loading platform 3 and the retreating operation on the retraction tread 16 are repeated, but the operator straddles the cover plate 4. It is only necessary to perform the operation, and it is not necessary to repeatedly ascend and descend between the top of the loading platform 3 and the ground as in the conventional case, so that the worker can safely load and unload the load. Can do. After these operations are completed, the frame 10 can be removed from the cargo bed 3 and transported to a predetermined storage location.
[0028]
In the case shown in the drawing, the retreat stairs 1 for loading and unloading a truck according to the present invention is used when an operation for loading and unloading the object W to be loaded onto the loading platform 3 by the crane 6 is performed. It can also be used when other loading and unloading devices such as are used.
[0029]
As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. Needless to say.
[0030]
For example, in the illustrated embodiment, as shown in FIG. 4 (A), the side surface of the frame 10 that is rectangular when viewed from above is hooked on the loading platform 3. ), It may be hung on the cargo bed 3 on the rear side. In that case, the suspension members 21 a and 21 b and the hook 22 are provided at the rear end of the frame body 10, and the handrails 32 are provided on both the left and right sides of the frame body 10. However, if the frame body 10 is arranged outside the loading platform 3, the hook 22 need not be provided.
[0031]
Further, the number of casters 28 is not limited to two as described above, and a total of four casters 28 may be provided so as to be provided at each of the four corners of the lower frame member 11, and the leg members 31d are also provided on the handrail support column 31d. May be provided so as to be movable up and down. Further, the handrail support columns 31a to 31d and the handrail 32 need not be used. In addition, the number of stepboards 17 and 18 for stairs is not limited to two as shown in the figure, but may be one or more. In this case, the position is set to be slightly lower than the upper surface of the cover plate 4 of the loading platform 3, but if the operator can easily move between the retraction tread 16 and the loading platform 3, It may be higher or lower.
[0032]
Further, in the illustrated case, the frame body 10 is formed by welding and joining a metal frame member. However, by joining the plate members, the frame body 10 as a staircase body is configured. Also good.
[0033]
【The invention's effect】
Of the inventions disclosed in the present application, effects obtained by typical ones will be briefly described as follows.
[0034]
(1) When loading or unloading work to be carried on a truck by a crane or a forklift, an operator can easily move from the loading platform to the retraction tread.
[0035]
(2) Since the operator can easily retreat to the retreat tread, it is possible to ensure the safety of the operator during loading and unloading.
[0036]
(3) To climb to the evacuation tread, the stairs can be easily climbed using the stairs tread, and when descending to the ground from the evacuation tread, it can be easily descended.
[0037]
(4) After the operation of the crane or the like is completed, the operator can easily move from the retraction tread to the loading platform, so that the work on the loading platform can be performed quickly and easily.
[Brief description of the drawings]
FIG. 1 is a side view showing a state in which a retracting stairs for truck loading / unloading according to an embodiment of the present invention is attached to a truck bed.
2 is an enlarged perspective view showing a retreat stairs for truck loading / unloading shown in FIG. 1. FIG.
3A is a rear view of a retreat stairs for loading and unloading a truck as viewed from the direction of arrow III A in FIG. 2, and FIG. 3B is a side view of the retreat stairs as viewed from the direction of arrow III B in FIG. FIG.
4A is a plan view of FIG. 3B, and FIG. 4B is a plan view seen from the same direction according to another embodiment of the present invention.
FIG. 5 is a perspective view showing a state in which a retreat stairs for truck loading / unloading is removed from the loading platform.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Retreat stairs for truck loading / unloading 2 Truck 3 Loading platform 4 Lifting board 5 Ground 6 Crane 10 Frame (main body)
11 Lower frame member 12 Upper frame members 13a to 13d Strut 14 Intermediate frame members 15a and 15b Strut 16 Retraction treads 17 and 18 Stair treads 21a and 21b Suspension members 22 Hooks 23 Abutting members 24a and 24b Socket members 25a and 25b Legs Member 26 Catch plate 27 Fastening screw member 28 Caster 29 Support rods 31a to 31d Handrail support 32 Handrail W Conveyed object (luggage)

Claims (3)

A lower frame member, an upper frame member positioned above the lower frame member, a support column that connects the lower frame member and the upper frame member, and a hook that is hooked to a landing plate of a truck bed. A staircase body that is detachably disposed on the outside of the loading platform;
A retracting tread that is provided on the upper frame member of the staircase body and used when an operator retreats from within the cargo bed;
A stair tread that is provided on the lower frame member of the stair main body and that is used when an operator climbs up and down between the ground and the retraction tread;
A leg member that is vertically extendable on the support column of the staircase body, and that supports the staircase body on the ground when the staircase body is hooked on the support plate of the cargo bed by the hook;
A plurality of casters that are provided on the lower frame member of the staircase body, move the staircase body away from the cargo bed, and run the staircase body with the leg members contracted;
By moving the staircase body to the outside of the loading platform and hooking the hook on the plate of the loading platform, an operator can ascend and descend on the loading platform, and an operator can carry the object to be loaded onto the loading platform. A retreat stairs for truck loading / unloading, characterized in that the retreat can be retreated to the retreat tread without returning to the ground. 2. The retreat stairs for truck loading / unloading according to claim 1, wherein two of the leg members are provided on the support column of the stairs main body , and two of the casters are provided on the lower frame member of the stairs main body. Retreat stairs for loading and unloading trucks.   The retreat stairs for truck loading / unloading according to claim 1 or 2, wherein the handrail is used by the worker when the worker ascends and descends each of the treads and retreats on the retreat stairs. A retreat staircase for loading and unloading trucks, characterized in that:

Images