JPH0221517Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to, for example, an elevating work platform on which a person can sit and work at a required height, and the handrail of the work platform can be lowered down.

[Prior Art] Generally, in this type of device, the handrail is lowered to keep the overall height low when the workbench is set at the lower limit position and stored in an appropriate location, so it is difficult to use the workbench. When doing so, the handrail must first be locked in the standing position prior to the ascent.

[Problems to be solved by the invention] However, in the conventional elevating work platform, there is no problem in raising the work platform even if the handrail is in the reclined position, so the problem is that the handrail is not locked in the upright position. It is possible to raise the work platform without realizing it, and in that case, it is dangerous to erect the handrail at the raised height.
Further, there are problems in that it is a waste of time to lower the workbench that has been raised once again to the lower limit position and start over from the beginning.

The object of this invention is to solve the above-mentioned problems of the conventional devices and to provide an elevating work platform in which the work platform cannot be raised unless the handrail is locked in the upright position.

[Means for solving the problem] In order to achieve the above-mentioned object, this invention provides a lifting work in which the handrail of the workbench, which is fixed to the upper end of a plurality of frames that are assembled so as to be extendable and retractable, can be folded down. At the platform, a locking device is provided that engages with the handrail and locks it in the upright position when the handrail is in the upright position, and locks the lower frame when the workbench is disengaged from the handrail when the workbench is at the lower limit position. This is how it was established.

[Function] By adopting the above-mentioned means, this device locks the lower frame when the handrail is not locked, and therefore it is possible to work without the locking device locking the handrail. Even if you try to raise the platform, the locking device will surely prevent it.

[Example] Hereinafter, an example of this invention shown in the drawings will be described.

In Figs. 1 to 4, 1, 2, and 3 are three-stage frames that are assembled telescopically and retractably into each other, and the frame 1 has a ladder 6 fixed to a long member 4 through arm members 5. The frame 2 has a ladder 9 fixed to a long member 7 via arm members 8, and the frame 3 has a ladder 12 fixed to a long member 10 via arm members 11. A base 13 is fixed to the lower end of the frame 1, and the base 13 has wheels 14 and casters 15.
The outriggers 16 can be extended in all directions and fixed in a horizontal state, and when the base 13 is in a horizontal state, the long materials 4, 7, 10 and the ladders 6, 9, All 12 extend vertically. The long materials 4, 7, and 10 are the fifth,
As shown in Fig. 6, the long materials 4,
At the upper end of 7, as shown in FIG.
Rollers 17 and 18 that fit into the grooves of the long pieces 4 and 7 are respectively attached, and rollers 19 and 18 that fit into the grooves of the long pieces 4 and 7 are attached to the lower ends of the long pieces 7 and 10, respectively, as shown in FIG. 20 are respectively attached and the rollers 17
The elongated members 4, 7, and 10 can expand and contract with each other by rolling or sliding the elongated members 4, 7, and 10 in the grooves. A manual winch 21 is attached to the long material 4, and the tip of the wire 22 is fixed to the lower end of the long material 7 via a pulley 23 provided at the top of the long material 4. One end of the wire 24 is fixed to the other end of the wire 24 is fixed to the lower end of the elongated material 10 via a pulley 25 provided at the top of the elongated material 7,
Thereby, the frames 1 to 3 can be freely expanded and contracted by operating the manual winch 21. Two wires 24 are provided to prevent the frame 3 from falling even if one wire 22 breaks, and a step 26 at the upper end of the ladder 6 is provided to prevent the frame 2 from falling even if the wire 22 should break. 7,8
As shown in the figure, a step 28 that locks the step 27 of the ladder 9 is provided so that it can be rotated in the direction of the arrow and retracted. At the upper end of the frame 3 is a workbench 29.
The base 30 of the workbench 29 is fixed to the handrail 3 of the workbench 29.
1 can be lowered around a support shaft 32 with respect to a base 30. The base 30 is provided with a locking device 33 on the opposite side of the support shaft 32, and the locking device 33 is attached to a pair of left and right first base plates 34 attached to a hinge 34a on the base 30, as shown in FIGS. 9 and 10. One ends of arms 35 and 36 are pivotally connected, and arm 3
A pair of second arms 37, 3 are provided at the other ends of 5, 36.
One end of the arm 8 is pivotally connected, and the other ends of the arms 37 and 38 are pivotally connected to each other by a pin 39.

When the handrail 31 is in the upright position, the locking device 33 lowers the pin 39 with the board 34 raised, and the arm 37,
When 38 is made into a straight line, the corner portion 42 engages with the grooves of the grooved pins 40 and 41 provided on the handrail 31,
43 are formed respectively, and the handrail 31 is provided with a support plate 44 that supports the pin 39 when the corner portions 42 and 43 are engaged with the grooves of the grooved pins 40 and 41. Further, when the workbench 29 is at the lower limit position, the arm 38 is configured to raise the pin 39 to separate the corner portions 42, 43 from the grooved pins 40, 41, and then to move the arms 35, 37 and the arms 36, 38
The locking device 33 is held in a straight line.
A key hook 45 is attached which locks the upper end step 26 of the ladder 6 of the frame 1 when the board 34 is brought down.

As shown in FIG.
is the top step 26 of the ladder 6 of the lowest frame 1
Since the handrail 31 is locked, even if the work platform 29 is raised and is not locked, it will not be possible to raise the work platform 29. Therefore, the worker will be sure to notice that the handrail 31 is not locked in the upright position. becomes. Then, by raising the locking device 33 and engaging the corner portions 42 and 43 with the grooves of the grooved pins 40 and 41, the manual winch 21 can be operated to raise and lower the workbench 29 to the required working height. Using the ladders 6, 9, and 12, the worker can freely climb up and down the workbench 29 located at the required working height.

In the above embodiment, the frames are arranged in three stages, but the frame is not limited to this.
2 and 3 have long pieces 4, 7, and 10, respectively, and arm pieces 5,
Although the ladders 6, 9, and 12 are fixed via the ladders 8 and 11, the present invention is not limited to this, and it goes without saying that various changes and modifications of the above-described embodiments can be made to this invention.

[Effects of the invention] Since this invention is configured as described above, the work platform cannot be raised unless the handrail is locked in the upright position, and as a result, no one notices that the handrail is not locked in the upright position. This eliminates the need to raise the work platform, and therefore
This system has excellent features such as being able to prevent the dangerous work of raising handrails at a raised height and the wasted time of lowering the work platform once it has been raised to the lower limit position and starting over again. It is effective.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, in which Fig. 1 is a front view of the extended state, Fig. 2 is a front view of the contracted state, Fig. 3 is a side view of the device shown in Fig. 5 is an enlarged sectional view of the main part along the - line of FIG. 1; FIG. 6 is an enlarged sectional view of the main part of the main part along the - line of FIG. 1; 7th
The figure is an enlarged view of the main part of Figure 1, and Figure 8 is an enlarged view of the main part of Figure 7.
FIG. 9 is an explanatory view of the lock device as seen from the front, and FIG. 10 is an explanatory view of the lock device as seen from the side. 1, 2, 3... Frame, 4, 7, 10... Long material, 5, 8, 11... Arm material, 6, 9, 12... Ladder,
13... Base, 14... Wheel, 15... Caster, 16
... Outrigger, 17, 18, 19, 20... Roller, 21... Manual winch, 22, 24... Wire,
23, 25...Pulley, 26, 27...Step, 2
8...Stopper, 29...Workbench, 30...Base, 3
1...Handrail, 32...Spindle, 33...Lock device, 3
4... Board, 35, 36... First arm, 37, 38
...Second arm, 39...Pin, 40, 41...Slotted pin, 42, 43...Corner part, 44...Support plate, 4
5...key hook.

Claims (1)

[Claims for Utility Model Registration] 1. In an elevating workbench in which a handrail 31 of the workbench is fixed to the upper end of a plurality of frames that are assembled to each other so as to be extendable and retractable, and can be freely lowered and lowered via a support shaft 32, A board 34 is rotatably attached to the opposite side of the support shaft 32 of the stand via a hinge 34a,
One end of a pair of left and right first arms 35, 36 is pivotally attached to the hinge side of this board, and the first
Second arms 37, 38 are pivotally attached to the other ends of the arms 35, 36, and these other ends are connected to each other by a pin 39. , when the handrail is in the upright position, pin 4 installed on the handrail
0 and 41, and one of the second arms 37 and 38 is provided with a key hook 45 that is hooked to the frame when the handrail is in a collapsed state. Elevating and lowering workbench. 2. The elevating workbench according to claim 1, wherein each frame 3 is provided with a ladder 6. 3. The elevating workbench according to claim 1, wherein the key hook 45 is hooked to the ladder step 26 of the lower frame.