JP6727685B1 - Vertical lift type work platform device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent shaking of a workbench with respect to a vehicle body of a truck. SOLUTION: A frame body which is planarly attached to a loading platform of a truck, a plurality of cylindrical first support posts protruding upward from the frame body in parallel, a work platform located above the frame body, and a work platform. A plurality of cylindrical second struts projecting upward and parallel to the respective first struts, and first and second female screws formed on the upper end of the first struts and the lower ends of the second struts coaxially with each other. Section, a male screw shaft having first and second male screw portions that are respectively screwed into the first and second female screw portions, and the male screw shafts are simultaneously rotated about the male screw shafts to form the first and second male screw portions. A vertical lifting type work platform apparatus including a drive unit that axially moves in and out of the first and second support columns via the second female screw portion, and thereby raises and lowers the work platform with respect to the frame body. [Selection diagram] Figure 1

Description

The present invention relates to a vertical lifting type work platform apparatus, and in particular, is used by being mounted on a truck bed for inspecting and repairing an inner wall of a road tunnel and installing and replacing electric equipment in the tunnel. The present invention relates to a vehicle-mounted vertical lifting type work platform device.

In road tunnels, in order to prevent the collapse and water leakage of the concrete inner wall, inspection, repair and reinforcement work of the tunnel inner wall and repair and replacement work of electrical equipment are regularly performed. In this case, a hydraulic aerial work platform device equipped with a lift-type basket was generally used.

In that case, the operation to align the basket along the inner wall of the tunnel is performed, but during that operation, there is the inconvenience that two or three workers cannot work, and the basket is narrow and the work cannot be performed efficiently. There was a problem. Therefore, platform-type vertical lift type work platforms have been used (see, for example, Patent Documents 1 and 2).

JP 62-11896 A JP, 2008-177464, A

Patent Document 1 describes a pantograph-type lifting device using a lift link mechanism and a hydraulic cylinder that drives the platform for lifting a platform (work table) of an aerial work vehicle. The commonly used aerial work platform device is of this type, but since the platform is moved up and down by a hydraulic cylinder, there are many joints including the link mechanism, and the swinging of the platform with respect to the truck body poses a problem. there were.

Further, in the platform type vertical lifting type work platform described in Patent Document 2, the truck and the work platform are integrated, and there is no load platform (space) for loading the work components, so the work components Need to be carried on the platform. Therefore, the working member must be removed from the platform each time when working, and the working efficiency is reduced. Further, since the platform is lifted and lowered by the hydraulic cylinder, the swing of the platform with respect to the vehicle body of the truck is a problem, as in the case of Patent Document 1.

The present invention relates to a frame body that is planarly attached to a luggage carrier of a truck, a plurality of cylindrical first columns that project upward from the frame body in parallel, a work platform that is located above the frame body, and a work platform. A plurality of cylindrical second struts projecting upward and parallel to the first struts, and first and second female screws formed on the upper end of the first struts and the lower ends of the second struts coaxially with each other. Section, a male screw shaft having first and second male screw portions that are respectively screwed into the first and second female screw portions, and the male screw shafts are simultaneously rotated about the male screw shafts to form the first and second male screw portions. And a drive unit for axially moving into and out of the first and second columns through the second female screw portion, thereby elevating and lowering the work table with respect to the frame body. It is a thing.

It is preferable that one of the first and second male screw portions has a right-hand thread and the other has a left-hand thread, and is formed in series with one male screw shaft.

The first and second female screw portions may each be composed of a nut.

It is preferable that the male screw shaft includes first and second elongated cylindrical covers that respectively cover the first and second male screw portions and can be inserted into the first and second columns.

The driving unit may include gears that drive the male screw shafts and a single motor that simultaneously drives the gears.

According to the vertical lifting type aerial work platform apparatus of the present invention, the work platform is mounted on the loading platform of the truck, and the plurality of cylindrical first support columns projecting upward in parallel from the frame are screwed to the first support columns. Since it is supported by the male screw shaft, it is possible to reduce the shaking of the workbench with respect to the load of the truck and to stabilize it, and it is possible to mount the work member in the space between the workbench and the load of the truck. it can.

If one of the first and second male screw parts is a right-hand screw and the other is a left-hand screw and is formed in series with one male screw shaft, it is necessary to rotate the male screw shaft shaft in one direction to perform the work. The table can be efficiently raised or lowered with respect to the frame.

By configuring the first and second female screw portions from nuts, the first and second female screw portions can be easily formed coaxially with each other at the upper end of the first support column and the lower end of the second support column.

The first and second male screw portions are protected from dust by providing the male screw shaft with the elongated cylindrical protective covers that cover the first and second male screw portions and can be inserted into the first and second columns, respectively.

Since the drive unit includes gears that drive the male screw shafts and a single motor that simultaneously drives the gears, the male screw shafts can be driven in synchronization, and the workbench can be moved relative to the frame. This makes it easy to efficiently raise and lower.

FIG. 3 is a perspective view of the vertical lifting type aerial work platform device according to the present invention and a truck equipped with the vertical lifting type aerial work platform device in a non-working state, showing a state in which the vertical lifting type aerial work platform device is descending on a load platform. FIG. 3 is a perspective view of the vertical lifting type aerial work platform apparatus according to the present invention and a truck on which the vertical lifting type aerial platform work is carried, showing a state in which the vertical lifting type aerial work platform apparatus is raised. FIG. 3 is a rear view showing a vertical lifting type work platform apparatus and a truck corresponding to FIGS. 1 and 2. FIG. 3 is a top view showing a driving unit according to the present invention. It is a side view which shows the male screw shaft by this invention. FIG. 4 is an enlarged cross-sectional view of a main part of the vertical lifting type work platform device shown in FIG. 3. FIG. 3 is a rear view showing a state in which a vertical lifting type work platform apparatus according to the present invention in a tunnel and a truck equipped with the same are working. It is a figure corresponding to FIG. 6 which shows the modification of this invention. It is explanatory drawing which shows arrangement|positioning of the male screw shaft of the modification shown in FIG.

The present invention will be described in detail below based on the embodiments shown in the drawings. The present invention is not limited to this embodiment.

FIG. 1 is a perspective view of a vertical lifting type work platform device (hereinafter referred to as a work platform device) 1 according to the present invention and a truck 2 on which the work platform device is mounted when the work is not performed. The work platform (platform) 12 and the drive unit 8 are lowered to the lowest position, and the tilt 14 is closed.

Normally, the truck 2 mounts a working member in a wide space formed between the drive unit 8 and the luggage carrier 3 in this state, and moves to the working position. A handrail 15 and a handrail wall 22 are provided around the workbench 12.
FIG. 2 is a perspective view of the truck 2 on which the workbench apparatus 1 is mounted during work, and shows a state in which the workbench apparatus 1 is lifted.
As shown in these figures, a frame 4 for installing the workbench apparatus 1 is fixed on the loading platform 3.

At the time of work, as shown in FIG. 2, the tilts 14 around the loading platform 3 are opened, the four outriggers 5 are pulled out from the four corners of the frame body 4, and the jacks 6 descend from the outriggers 5 and the road surface 31 ( 3) fixed on top.
At the four corners of the frame 4 and the workbench 12, the cylindrical first support columns 7 and the cylindrical second support columns 13 are arranged parallel to each other upward, and coaxially with the drive unit 8 interposed therebetween. It is attached by welding.

FIGS. 3A and 3B are rear views of the workbench apparatus 1 mounted on the truck 2 corresponding to FIGS. 1 and 2, respectively. As shown in FIGS. 3A and 3B, male screw shafts 9 extending in the vertical direction from the drive unit 8 are respectively screwed into the first strut 7 and the second strut 13 facing each other from above and below. The male screw shaft 9 is covered with a protective cover 16 as described later (see FIG. 3B).

FIG. 4 is a plan view showing the drive unit 8, FIG. 5 is a side view of the male screw shaft 9, and FIG. 6 is an enlarged cross-sectional view of a main part of FIG.
As shown in FIG. 4, the drive unit 8 is provided with worm gears 19 at four corners and a motor 21 at the center. The output shaft 23 of the motor 21 is connected to the worm shafts 19a (FIG. 6) of the worm gears 19 at the four corners via a torque transmission mechanism composed of three gearboxes 20, six drive shafts 25 and 13 couplings 24. Connected to each other.

The male screw shaft 9 shown in FIGS. 3 and 4 includes a round shaft portion 30 at the center in the longitudinal direction as shown in FIG. 5, and further has a first screw portion 10 and a second screw portion extending in the longitudinal direction from both sides thereof. 11 is provided. The first screw portion 10 and the second screw portion 11 are formed with mutually opposite screws (when one is a right screw, the other is a left screw), and the round shaft portion 30 is not formed with a screw. Further, a pin hole 29 for a fixing pin is formed at the center of the round shaft portion 30.

Referring to FIG. 6, the worm gear 19 includes a worm shaft 19a and a worm wheel 19b that meshes with the worm shaft 19a, and the male screw shaft 9 penetrates the worm wheel 19b in the vertical direction.
The male screw shaft 9 is fixed to the worm wheel 19b by inserting the fixing pin 26 into the pin hole 29 (FIG. 5) of the round shaft portion 30, and the worm gear 19 has the first screw portion 10 on the lower side and the second screw portion on the upper side. 11 respectively project vertically.

On the other hand, as shown in FIG. 6, the first support column 7 shown in FIG. 3 is internally provided with a cylindrical inner first support column 7a having the same height as that of the first support column 7 and the lower end of the first support column 7a is A nut 27 having a female screw threaded to the first screw portion 10 is welded to the lower end of the one support 7 together with the backing plate.

Further, as shown in FIG. 6, the second support column 13 shown in FIG. 3 is provided with a cylindrical inner second support column 13a having the same height as that of the second support column 13 coaxially, and the upper end thereof is The two posts 13 are welded to the upper ends together with the backing plate, and the lower ends are welded to the nuts 28 having female threads that are screwed into the second screw portions 11.

Further, as shown in FIG. 6, the tubular protective cover 16 extending in the longitudinal direction from the lower side and the upper side of the worm gear 19 to protect the first screw portion 10 and the second screw portion 11 from dust is the first screw portion. 10 and the second screw portion 11 are provided coaxially.
When the drive unit 8 moves in the vertical direction relative to the first support column 7 and the second support column 13, each protective cover 16 has a gap between the first support column 7 and the inner first support column 7a and the second support column 13. And the inner first support column 13a.

In such a configuration, as shown in FIG. 7, when the truck 2 mounting the workbench apparatus 1 shown in FIG. 1 arrives at a desired work position in the tunnel 17, as described above, the loading platform 3 (FIGS. 1 and 2) is used. The surrounding tilts 14) are opened, the four outriggers 5 are pulled out from the four corners of the frame body 4, and the jacks 6 descend from the outriggers 5 and are fixed on the road surface 31.

The worker takes out a necessary work member from the loading platform 3 (FIG. 2), mounts it on the work platform 12 together with the work member, and operates an operation panel (not shown) to drive the motor 21 shown in FIG. When the output shaft 23 of the motor 21 rotates, its rotational force is transmitted to the worm gear 19 via the coupling 24, the gear box 20 and the drive shaft 25, and the worm wheel 19b rotates the male screw shaft 9 about its axis.

When the output shaft 23 of the motor 21 rotates in the normal direction, the drive unit 8 and the workbench 12 rise accordingly, and when the output shaft 23 rotates in the reverse direction, the drive unit 8 and the workbench 12 descend.
When the motor 21 is stopped, the worm wheel 19b is automatically prevented from rotating by the worm shaft 19a, so that the workbench 12 does not descend even if the motor 21 does not have a braking function.

In this way, the operator can operate the operation panel to raise or lower the workbench 12 to a desired height, and easily perform the replacement work of the lighting equipment 18 of the tunnel 17 or the repair work of the inner wall. ..

[Modification]
FIG. 8 is a view corresponding to FIG. 6 showing a modified example of the present invention, and FIG. 9 is an explanatory view showing the arrangement of the worm gear and the male screw shaft of the modified example shown in FIG.
In this modification, as shown in FIG. 8, another worm gear 19a is connected to each worm gear 19 shown in FIG.

Then, the first screw portion 10 of the male screw shaft 9 is coupled downward to each worm gear 19, and the protective cover 16 is also disposed downward. Further, the second screw portion 11 of the male screw shaft 9 is coupled to each worm gear 19a in an upward direction, and the protective cover 16 is also installed in an upward direction.

Therefore, the axis of the second screw portion 11 shifts in parallel with the axis of the first screw portion 10, so that the mounting position of the second support column 13 on the workbench 12 is displaced from the second screw portion 11. Changed to correspond. Other configurations are the same as those in the above embodiment.

1 Vertical Elevating Work Platform 2 Track 3 Loading Platform 4 Frame 5 Outrigger 6 Jack 7 First Support 7a Inner First Support 8 Drive Unit 9 Male Screw Shaft 10 First Screw Part 11 Second Screw Part 12 Work Table 13 Second Post 13a Inner second post 14 Tilt 15 Handrail 16 Protective cover 17 Tunnel 18 Lighting equipment 19 Worm gear 19a Worm shaft 19b Worm wheel 20 Gear box 21 Motor 22 Handrail wall 23 Output shaft 24 Coupling 25 Drive shaft 26 Fixing pin 27 Nut 28 Nut 29 Pin hole 30 Round shaft 31 Road surface

Claims (5)

A frame body that is planarly attached to the cargo bed of the truck, a plurality of cylindrical first columns that project upward from the frame body in parallel, a work table that is located above the frame body, and a parallel table that is upward from the work table. A plurality of cylindrical second struts that project coaxially with each of the first struts, first and second female threaded portions formed coaxially with each other at the upper ends of the first struts and the lower ends of the second struts, respectively. A male screw shaft having first and second male screw parts respectively screwed into the first and second female screw parts, and simultaneously rotating the male screw shafts about the respective male screw shafts to form the first and second male screw parts as the first and second female screws. A vertical lifting type work platform apparatus including a drive unit for axially moving into and out of the first and second support columns through a section to thereby raise and lower the work platform with respect to the frame. The vertical lifting type work platform apparatus according to claim 1, wherein one of the first and second male screw parts is a right-hand screw and the other is a left-hand screw. The vertical lifting type work platform apparatus according to claim 1 or 2, wherein the first and second female screw portions are respectively constituted by nuts. The said male screw shaft is provided with the elongated cylindrical 1st and 2nd cover which can be inserted in the 1st and 2nd support|pillar, respectively, covering the 1st and 2nd male screw part, The any one of Claims 1-3. Vertical lifting type work platform equipment. The vertical elevating work platform apparatus according to claim 1, wherein the drive unit includes a gear that drives each male screw shaft, and a single motor that simultaneously drives the gears.

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