JP4526141B2 - Handrail for height platform - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a handrail for an aerial work platform.
[0002]
[Prior art]
An example of an aerial work platform A equipped with this type of aerial work platform will be described below. As shown in FIGS. 4 and 5, the aerial work vehicle A has an inner box 3 vertically mounted on the vehicle 1 and an inner box 3 and an outer box 4 fitted in the inner box 2 and the inner box 3 so as to be extendable and retractable. Appropriate expansion / contraction drive means are arranged between the boxes so that the inner box 3 can be expanded and contracted relative to the inner box 2 and the outer box 4 can be expanded and contracted relative to the inner box 3. A work table 5 is attached to the outer box 4, the middle box 3 and the outer box 4 are extended to position the work table 5 at a high position, and an operator who has boarded the work table 5 is positioned at a high position. It is possible to work at high places.
[0003]
Further, the vehicle 1 is provided with an outrigger 7 projecting laterally from the vehicle 1 and provided with a jack 6 at the tip, so that the vehicle 1 with the work table 5 positioned at a high position is not overturned by the outrigger 7. To support.
[0004]
In the work platform 5 of the aerial work platform A, a support column 8 is erected at each corner, and a handrail 9 is supported along the outer edge of the floor plate 5a of the work platform 5 supported by the support column 8. I have. Further, a handrail 17 supported by the support column 16 is disposed on the side edge of the floor plate 5 a of the work table 5. By the way, the aerial work vehicle A is configured such that the expansion floor 10 is extended from one side edge of the floor plate 5a of the work table 5 so that the floor of the work table 5 can be expanded.
[0005]
That is, the expansion floor 10 is pivotally supported on one side edge of the floor plate 5a of the work table 5, the expansion floor 10 is set to a vertical posture when retracted, and the work table is rotated outward about the pivot point when extended. The expansion floor 10 is extended from one side edge of the floor plate 5a of the fifth floor so as to expand the floor. The expansion floor 10 at the time of overhanging is used as a stopper when the expansion floor 10 is overhanging by contacting the floor plate 5a of the work table 5. Therefore, the expanded floor 10 brought into contact is maintained in a substantially horizontal state.
[0006]
In addition, a cylinder 11 containing an elastic body is disposed on the lower surface side of the floor plate 5 a of the work table 5, and the rod of the cylinder 11 is connected to the lower surface side of the expansion floor 10 via a link rod 12. Thus, the arranged cylinder 11 functions as an assist when the expansion floor 10 is extended and stored.
[0007]
[Problems to be solved by the invention]
By the way, when the extended floor 10 is extended from the work table 5, the handrail 9 supported by the support column 8 is removed from one side edge of the floor plate 5 a of the work table 5 and held on one side edge of the outer edge by the expansion floor 10. Need to be installed. That is, both ends of the handrail 9 are locked to the support column 8, and the support column 8 is erected by being inserted into the hole 14 provided in the corner portion of the floor plate 5 a of the work table 5. Also, a hole 15 for inserting the support column 8 is provided. When the expansion floor 10 is extended, the support column 8 is inserted into the hole 15 and is erected.
[0008]
When the handrail 9 is held at one side edge of the expansion floor 10, it is supported between the column 8 moved to the side edge side of the expansion floor 10 and the column 16 arranged on the side edge of the floor plate 5 a of the work table 5. The handrail 13 is connected.
[0009]
Thus, it is necessary to move the handrail 9 every time the extended floor 10 is extended or stored from the work table 5. That is, when the handrail 9 is moved, the worker must move to the one side edge of the expansion floor while holding the handrail 9 in a state where the handrail 9 is not guided. There was a risk of falling over one side edge. In particular, when the work table 5 is positioned at a high place, the expansion floor 10 may be extended or stored, and such work is further dangerous.
An object of the present invention is to provide a handrail for an aerial work platform that solves such problems.
[0010]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the handrail for an aerial work platform according to the present invention has a column erected at each corner portion of the work platform for an aerial work and is supported by the column along the outer edge of the floor plate of the work platform. A handrail for an aerial work platform equipped with a handrail, which is configured to extend by extending an extended floor from one side edge of the floor plate of the work table, and the handrail on the one side edge is engaged with a handrail support provided at both ends. The parallel post link on one side edge side of the side edge adjacent to the one side edge and the handrail support post are connected by a parallelogram link that can be bent at the center, and the parallel quadrilateral link is bent at the time of bending. It is constructed so that the link overlaps in the thickness direction when it is moved up and down and folded, and the handrail on the one side edge is extended to one side edge of the extended floor with the link extended when the extended floor is extended When storing the floor, the link should be folded and the floor of the work table It is characterized in that it has to be arranged at the side edges.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the handrail for an aerial work platform according to the present invention will be described with reference to FIGS. Therefore, since the reference numerals 1 to 17 are the same as those described in the related art, the same reference numerals are used in the following description, and detailed description thereof is omitted.
[0012]
In FIG. 1, reference numeral 20 denotes a handrail support, which locks both ends of the handrail 9 on the upper part thereof and allows the lower part to be inserted into the holes 14 and 15. Reference numeral 21 denotes a guide tube that is externally fitted to the handrail support column 20 so that the handrail support column 20 can be inserted and removed from the guide tube 21.
[0013]
Reference numeral 22 denotes a parallelogram link disposed between the guide tube 21 and the support column 8. The parallelogram link 22 pivotally supports one end of each of the guide cylinder side links 22a and 22b above and below the guide cylinder 21, and pivotally supports one end of each of the pillar side links 22c and 22d above and below the column 8, respectively. Are arranged. The other ends of the links are connected to each other so as to be pivotable with respect to each other, and the links 22e and 22f are pivotally connected with an intermediate link 22g.
[0014]
As shown in FIG. 2, the intermediate link 22g is disposed so as to be positioned between the guide cylinder side link 22a and the support column side link 22c, and these links are disposed so as to overlap each other in the folded state.
[0015]
Reference numeral 23 denotes a stopper, and guide cylinder side links 22a and 22b of the parallelogram link 22 and support side links so that the connections 22e and 22f of the parallelogram link 22 move upward and bend. 22c and 22d are locked so that they can be extended only to a slightly bent state without reaching a horizontal state, and are locked when the guide cylinder side link 22a abuts against a stopper 23 attached to the guide cylinder 21. It is like that.
[0016]
The guide cylinders 21 are arranged in a pair of left and right, and left and right handrail struts 20 locked to both ends of the handrail 9 are respectively inserted between the left and right handrail struts 20 and the corresponding left and right struts 8. The parallelogram links 22 are arranged respectively.
[0017]
And in the state which folded the parallelogram link 22 and overlapped each link, as shown in FIGS. 2-3, the handrail support | pillar 20 is inserted in the hole 14 provided in the one side edge of the floor board 5a of the work table 5. The position of the hole 14 is determined so that the lower part can be inserted. When the parallelogram link 22 is extended until the guide cylinder side link 22a comes into contact with the stopper 23, the guide rail 20 is inserted into one side edge of the extended floor 10 as shown in FIG. The cylinder 21 is moved, and the position of the hole 15 is determined so that the lower part of the handrail support 20 can be inserted into the hole 15 provided on one side edge of the extended floor 10.
[0018]
24, the extension floor 10 is extended and the parallelogram link 22 is extended until the guide cylinder side link 22a comes into contact with the stopper 23, and the lower portion of the handrail support 20 is inserted into the hole 15 provided on one side edge of the extension floor 10. This is an auxiliary handrail that connects between the upper end portions of the support column 8 and the handrail support column 20. As shown in FIG. 2, the auxiliary handrail 24 is in a state in which one end of the auxiliary handrail 24 is pivotally supported on the upper end portion of the column 8 and vertically suspended in the state in which the extended floor 10 is stored. In the state where the extended floor 10 is extended, as shown in FIG. 1, the auxiliary handrail 24 is rotated approximately 90 degrees and the bolt provided at the other end of the auxiliary handrail 24 is inserted into the mounting hole provided at the upper end of the handrail support 20. The other end of the auxiliary handrail 24 and the upper end portion of the handrail support 20 are connected by being penetrated and tightened with a wing nut.
[0019]
Reference numeral 25 denotes a retaining pin, which penetrates through a narrow hole formed in the handrail support 20 located below the guide tube 20 with the lower end of the handrail support 20 inserted into the hole 14 or 15. When the lower end portion of the handrail support 20 is to be removed from the hole 14 or 15, the retaining pin 25 comes into contact with the lower side of the guide tube 20 and the lower end portion of the handrail support 20 is This is for preventing the hole 14 or the hole 15 from coming out.
[0020]
The handrail for an aerial work platform according to the present invention configured as described above operates as follows.
First, when the extended floor 10 is in the retracted state from the floor plate 5a of the work table 5, the lower end of the handrail column 20 inserted into the guide tube 21 with the parallelogram links 22 folded and the links overlapped. The part is inserted into a hole 14 provided on one side edge of the floor plate 5 a of the work table 5. Therefore, the handrail 9 is provided along one side edge of the floor plate 5 a of the work table 5.
[0021]
Next, when the extended floor 10 is extended from the floor plate 5 a of the work table 5, the retaining pin 25 is removed from the handrail support column 20, and the lower end portion of the handrail support column 20 is connected to the floor plate 5 a of the work table 5. The handrail 9 is pulled out from the hole 14 provided on one side edge, and the handrail 9 is moved in the direction of one side edge of the extended floor 10 with the handrail support 20 inserted into the guide tube 21. Then, the parallelogram link 22 extends, and the parallelogram link 22 extends until the guide cylinder side link 22a abuts against the stopper 23. In this state, the lower end portion of the handrail support 20 is inserted into a hole 15 provided on one side edge of the extended floor 10, and the retaining pin 25 is inserted into a narrow hole of the handrail support 20.
[0022]
Then, the auxiliary handrail 24 is rotated approximately 90 degrees, a bolt provided at the other end of the auxiliary handrail 24 is inserted into a mounting hole provided at the upper end portion of the handrail support column 20 and tightened with a wing nut, and the other end of the auxiliary handrail 24 and the handrail are used. The upper end of the column 20 is connected. Thus, the handrail 9 is provided along one side edge of the extended floor 10 protruding from the floor board 5a. In addition, a handrail by a parallelogram link 22 and an auxiliary handrail 24 is provided on the outer edge along the side of the extended floor 10. On the other hand, when the extended floor 10 is stored from the floor plate 5a of the work table 5, the operation may be reversed.
[0023]
As described above, the handrail 9 is moved each time the extended floor 10 is extended or stored from the work table 5. When the handrail 9 is moved, the handrail support 20 is moved while being inserted into the guide tube 21. Yes, the guide cylinder 21 is supported by the support column 8 by the parallelogram link 22, so that even if the lower end portion of the handrail support column 20 is pulled out from the hole 14, the handrail support column 20 does not fall down and the extension floor 10 The handrail 9 and the handrail support 20 are not moved beyond one side edge. Therefore, it is possible to prevent the operator from accidentally falling over one side edge of the extended floor 10.
[0024]
Further, when the extended floor 10 is extended from the work table 5 and the handrail 9 is moved, the lateral outer edge of the extended floor 10 is guarded by the parallelogram link 22, so that the operator falls down at this time. Can be prevented. Furthermore, since the lower end portion of the handrail support column 20 is guided to the position of the hole 15 by the parallelogram link 22, the lower end portion of the handrail support column 20 can be easily inserted into the hole 15.
[0025]
In the above embodiment, both ends of the handrail 9 are locked to the handrail support 20, but the handrail 9 and the handrail support 20 may be integrated.
[0026]
Further, the handrail support 20 is inserted into the guide tube 21 and the parallelogram link 22 is attached to the guide tube 21. However, the parallelogram link 22 may be directly attached to the handrail support 20. . In this case, the lower end portion of the handrail support column 20 cannot be inserted into and removed from the holes 14 and 15, but an appropriate detachable connecting device may be attached between the lower end portion of the handrail support column 20 and the floor plate 5 a or the extended floor 10.
[0027]
Next, in the above-described embodiment, the extended floor 10 is pivotally supported on the floor plate 5a of the work table 5 and rotated to extend the extended floor 10 from the floor plate 5a of the work table 5. However, the present invention is not limited to this. The present invention can be implemented even if the extended floor 10 is extended and stored by other methods such as extending and retracting the extended floor 10 from the floor plate 5a of the work table 5.
[0028]
【The invention's effect】
The altitude work handrail of the present invention constructed and operated as described above is supported by the support with a parallelogram link when the handrail is moved, so that the handrail and the handrail support are tilted when the handrail is moved. The handrail and the handrail support are not moved beyond one side edge of the extended floor. Therefore, it is possible to prevent the operator from accidentally falling over one side edge of the extended floor.
[0029]
Further, when the extended floor is extended from the work table and the handrail is moved, the lateral outer edge of the extended floor is guarded by the parallelogram link, so that the operator can be prevented from falling at this time.
[Brief description of the drawings]
FIG. 1 is an explanatory view for explaining a handrail for high place work according to the present invention, showing a state in which an extended floor is extended.
FIG. 2 is an explanatory diagram for explaining a handrail for high-altitude work according to the present invention, showing a state in which an extended floor is stored and a parallelogram link is folded.
FIG. 3 is an explanatory diagram for explaining a handrail for high-altitude work according to the present invention, and a plan view of the parallelogram link portion of FIG. 2;
FIG. 4 is an explanatory view illustrating a conventional handrail for working at high places.
FIG. 5 is an explanatory diagram for explaining a conventional handrail for working at high places, and is a view of FIG. 4 viewed from the side.
[Explanation of symbols]
5 Work platform 5a Floor board 8 Post 9 Handrail 20 Handrail support 22 Parallelogram link

Claims (1)

A handrail for an aerial work platform provided with a pillar at each corner of the work platform for aerial work and provided with a handrail along the outer edge of the work floor. An extension floor is extended from one side edge so that the floor can be expanded, and the handrail on the one side edge is locked to a handrail support provided on both ends, and the support on the one side edge side adjacent to the one side edge. Are connected by a parallelogram link that can be bent at the center, and the folding point moves up and down when the parallelogram link is folded, and the link overlaps in the thickness direction when folded. The handrail on the one side edge is extended to one side edge of the extended floor when the extended floor is extended, and the link is folded to store one side edge of the floor plate of the work table when the extended floor is stored. For aerial work platforms characterized in that Sliding.

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