JP3254674B2 - Elevating platform device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating platform for working indoors and outdoors.

[0002]

Heretofore, a stepladder has been generally used as this type of object used when working indoors and outdoors. However, in such a stepladder, the stability of the stepladder itself is low, and a fall accident or the like is feared due to work performed on the stepladder. In order to solve such a problem, for example, a lifting platform that raises and lowers the working platform by a hydraulic cylinder or the like on a grounded base may be considered.
It is necessary to mount wheels on the base for moving the base, and there is a problem that stability when working on the work table with the wheels grounded is low. For this reason, at the time of work, it is necessary to provide support legs and slightly lift the base to lift the wheels above the floor or the ground. .

Accordingly, the present invention is a lifting platform device in which a worktable is provided on a grounding base provided with wheels so as to be movable up and down, and a mechanism for lifting the wheels from the floor or the like without using a hydraulic cylinder or the like. An object of the present invention is to provide a lifting platform device.

[0004]

According to the first aspect of the present invention, there is provided a base having front and rear rods and both side rods, supporting legs provided at four corners facing downward, and a link having a lifting drive on the base. A worktable provided via a mechanism, a wheel provided on the base so as to be able to move up and down via a mounting shaft provided on the inside of the support leg, and a pressing member provided downward on a link rod of the link mechanism A supporting shaft rotatably provided between the front and rear rods, a connecting rod connecting the pair of mounting shafts to each other in parallel with the side rods, An elevator having a lever provided so as to face and contact the lower end of the pressing member, and a small link rod rotatably connecting a substantially center of the lever and the connecting rod. Device.

Therefore, according to the first aspect of the present invention, the wheels can be moved up and down in response to expansion and contraction of the link mechanism.

According to a second aspect of the present invention, there is provided the elevator apparatus according to the first aspect, wherein an arc portion is provided at a tip of the lever.

Therefore, according to the second aspect of the present invention, the wheels can be reliably moved up and down via the lever by the pressing member in response to the expansion and contraction of the link mechanism.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The base 1 of the lifting platform device includes a front and rear rod 1A,
A plane consisting of 1B and both side rods 1C and 1D is a rectangular frame, and a work table 2 is provided on a base 1 via a link mechanism 4 having a hydraulic cylinder 3 as a lifting drive. The workbench 2 has a bottom plate 5 provided with a fence 6 for preventing falling, and further provided on the bottom plate 5 with a foot-operated hydraulic pump 8 provided with a press-operable lever 7 for operating the hydraulic cylinder 3. The hydraulic hose 9 is connected between the hydraulic pump 8 and the hydraulic cylinder 3. The link mechanism 4 includes front rods 1A and 1B.
A pair of lower link bars 10 and 11 are provided on the upper side, respectively, and a pair of upper link bars 12 and 13 are provided above the link bars 10 and 11. A substantially central portion of the lower link rods 10 and 11 is rotatably provided to each other via a pivot 14, and a lower end of the lower link rod 10 is rotatably provided to the front rod 1A via a shaft 15. At the lower end of 11 is provided a roller 16 which is a running body,
The roller 16 can travel on front rods 1A and 1B having a U-shaped cross section. Further, the upper ends of the lower link rods 10 and 11 are rotatably connected to the lower ends of the upper link rods 13 and 12 via shafts 17 and 17A. It is movably connected. A roller 19 serving as a traveling body provided at the upper end of the upper link rod 12 can travel along a guide (not shown) provided on the bottom plate 5. On the other hand, the upper end of the upper link rod 13 is rotatably connected to the bottom plate 5 via a shaft 20. A rod 3B of a hydraulic cylinder 3 having a base end 3A rotatably connected to the base 1 is rotatably connected to a pivot 14 via a bracket 21. Therefore, the operating valve 8A of the hydraulic pump 8 is
Is switched to ascending, the pressing lever 7 is stepped on to supply the oil of the hydraulic pump 8 to the hydraulic pump 8 via the hydraulic hose 9, and the rod 3B is extended, and as a result, the link mechanism 4 is extended. The work table 2 can be moved up. On the other hand, when the operation valve 8A of the hydraulic pump 8 is switched for lowering, and the pressing lever 7 is stepped on, the oil of the hydraulic pump 8 is supplied to the hydraulic pump 8 through the hydraulic hose 9 in the opposite direction. As a result, the link mechanism 4 is also reduced so that the work table 2 can be lowered.

Further, support legs 22, 22A are provided at the four corners of the base 1.
Is provided downward. These support legs 22, 22A are front and rear rods 1.
Both sides 1C, 1D are downwardly fixed to the outer ends of the slide rods 23, 23A which can slide inside the both-side rods 1C, 1D so as to be able to protrude outside of A, 1B, that is, in the front-back direction. Further, wheels 24, 25 are provided on the left and right inside the support legs 22, 22A, respectively. The wheels 24 and 25 are respectively provided on the base 1 and thus the supporting legs 22 and
It rises with the extension and contraction of the link mechanism 4 with respect to 22A,
You can descend.

Next, the drive device A for raising and lowering the wheels 24 will be described. The wheels 24 are mounted on a caster frame 26, and a mounting shaft 27 is erected on the upper surface of the caster frame 26. The mounting shaft 27 is mounted on a guide cylinder 28 as a guide fixed to the outside of the front and rear rods 1A and 1B. Guide tube that can be inserted up and down freely
A spring 30 which is an elastic body is interposed between an upper plate 29 protruding from 28 and an upper portion of the guide cylinder 28, and the spring 30 constantly urges the mounting shaft 27, and eventually the wheel 24 upward.
A large stopper 27A provided on the lower side of the guide tube 28 is engaged with the lower end of the guide tube 28. Then, as shown in FIG. 2, when the wheel 24 is at the lower position, the wheel 24 is located below the lower end of the support leg 22, that is, it comes into contact with the ground,
On the other hand, as shown in FIG. 3, when the wheel 24 is at the upper position, it is located above the lower end of the support leg 22, that is, floats. A pair of mounting shafts 27 each having a pair of wheels 24 mounted thereon are connected by a connecting rod 31 parallel to the side rod 1C.

Next, a description will be given of a configuration in which the wheels 24 are switched to a state of contact with the ground (FIG. 2) or a state of floating (FIG. 3) with the elevation of the link mechanism 4. The pressing member 32 is fixed downward on the shaft 17 side of the pair of upper link rods 12. An arc plate 33 is provided at the lower end of the pressing member 32 so as to project downward. The front and rear rods 1A and 1B are provided with cantilevered levers as responders.
34 will be provided. A base end 34A of the lever 34 is fixed to a support shaft 35 erected between the front and rear rods 1A and 1B, and an arc portion 34B is provided at the tip thereof so as to protrude upward.
Are brought into contact with each other. Also, the support shaft 35
Are rotatably supported by bearings 36,
The bearing 36 is fixed to the front and rear rods 1A and 1B via a bracket 36A. Further, the substantially central portion of the lever 34 and the connecting rod 31 are connected by a small link rod 37. One end of the small link rod 37 is a shaft
The other end is rotatably connected to a bracket 39 provided on the connecting rod 31 by a shaft 40 while being rotatably connected by 38. Therefore, when the link mechanism 4 is reduced, the upper link rod 12 descends together with the pressing member 32, and the pressing member 32 presses the lever 34, and pushes down the wheel 24 via the small link rod 37 to ground the wheel 24, The support leg 22 relatively rises.
On the other hand, when the link mechanism 4 is extended, the upper link rod 12 rises together with the pressing member 32, the wheel 24 is pulled up by the spring 30, and as a result, the support leg 22 is grounded.

Next, a description will be given of the wheel lifting drive device B for the wheels 25. The wheels 25 are mounted on a frame 41, and a mounting shaft 42 is erected on the upper surface of the frame 41.
Is a guide cylinder which is a guide portion fixed to the outside of the front and rear rods 1A and 1B.
Upper plate which is inserted into 43 so as to be able to move up and down and protrudes from guide tube 43
A spring 45, which is an elastic body, is interposed between 44 and the upper part of the guide cylinder 43. The spring 45 constantly urges the mounting shaft 42, and thus the wheel 25, upward, and is provided on the lower side of the mounting shaft 42. The large-diameter stopper 42A is adapted to be locked to the lower end of the guide cylinder 43. When the wheel 24 is in the lower position as shown in FIGS. 5 and 6, it is located below the lower end of the support leg 22A, that is, is in contact with the ground, while as shown by the dashed line in FIG. When the wheel 25 is in the upper position, it is located above the lower end of the support leg 22A, that is, floats. The pair of mounting shafts 42 each having the pair of wheels 25 mounted thereon are connected by a connecting rod 46 parallel to the side rod 1D.

Next, a description will be given of a configuration in which the wheels 25 are switched to a state in which the wheels 25 contact the ground or float as the link mechanism 4 moves up and down. A pressing member 47 is fixed downward on the shaft 17A side of the pair of lower link rods 10. The front and rear rods 1A and 1B are provided with a cantilevered lever 48 as a responsive body. Base end 48A of lever 48
Is fixed to a support shaft 49 erected between the front and rear rods 1A and 1B. A concave receiving portion 50 of the pressing member 47 is provided at the distal end side. It is supposed to. Both ends of the support shaft 49 are rotatably supported by bearings 51 fixed to the front and rear rods 1A and 1B. Further, the substantially central portion of the small lever 48 and the connecting rod 46 are connected by the small link rod 52. One end of the small link rod 52 is rotatably connected by a shaft 53, and the other end is rotatably connected by a shaft 55 to a bracket 54 provided on the connecting rod 46. Therefore, when the link mechanism 4 is contracted, the lower link rod 10 descends together with the pressing member 47, and the pressing member 47 presses the lever 48, and pushes down the wheel 25 via the small link rod 52 to ground the wheel 25, The support leg 22A relatively rises. On the other hand, when the link mechanism 4 is extended, the lower link rod 10 rises together with the pressing member 47, and the wheel 25 is pulled up by the spring 45,
As a result, the support leg 22A comes into contact with the ground.

Next, the operation of the above configuration will be described. First, the elevator device is transported to a desired position. At this time, the link mechanism 4 has been reduced, so that the pressing members 32, 47
Presses the levers 34, 48, and the wheels 24, 25 are at the lower position and are in contact with the ground, and can be moved by the wheels 24, 25. Next, the support legs 22, 22A are pulled out. At this time, the sliding rods 23, 23A slide on both side rods 1C, 1D. Next, when the operator gets on the work table 2 and switches the operation valve 8A to the ascending state and then operates the pressing lever 7 by stepping on the leg, oil is supplied to the hydraulic cylinder 3 and the rod 3B
With this, the included angle of the lower link rods 10 and 11 and the upper link rods 12 and 13 is reduced, and the link mechanism 4 is extended. At this time, the upper link rod 12 rises together with the pressing member 32, and the wheel 24 is pulled up by the spring 30, so that the support leg
22 relatively descends and touches down . On the other hand, the lower link rod 10
Rises together with the pressing member 47, and the wheel 25 is pulled up by the spring 45. As a result, the support leg 22A relatively lowers and contacts the ground. When the desired height is reached, the operation is performed by switching the operation valve 8A to the stop position.

Next, when the operation is completed, when the operation valve 8A is switched to the down position and the pressing lever 7 is operated again, the oil is supplied to the hydraulic cylinder 3 in the reverse direction, and the rod 3B is contracted. 10, 11 and upper link rod 1
The included angle between 2 and 13 increases, and the link mechanism 4 contracts. At this time, the upper link rod 12 descends together with the pressing member 32,
The pressing member 32 presses the lever 34 and also pushes down the wheel 24 via the small link rod 37 to ground the wheel 24, so that the support leg 22 moves up relatively. The lower link rod 10 is a pressing member.
It lowered with 47, the pressing member 47 with pressing the Teko杆48, grounds the wheel 25 pushes down the wheels 25 via a small link rod 52, relative support legs 22A rises. In this way, the wheels 24, 25 are in contact with the ground, that is, the support legs 22,
With the 22A floating, the sliding rods 23, 23A are moved to both side rods 1C,
After pushing it into 1D and returning the support legs 22, 22A to their original positions, they can be moved to another location.

As described above, in the above embodiment, the support legs 22,
A work table 2 provided on the base 1 via a link mechanism 4 provided with a hydraulic cylinder 3; wheels 24, 25 provided on the base 1 so as to be able to move up and down;
The wheels 24 and 25 are moved up and down with respect to the base 1 in response to the lifting and lowering of the work table 2 by providing the wheel lifting and lowering driving devices A and B for raising and lowering the wheels 24 and 25 in response to the lifting and lowering of the base. Wheel
24, 25 can be grounded or floated. Therefore, it is not necessary to separately provide a hydraulic cylinder or the like for raising and lowering the wheels 24 and 25, and the device can be downsized.

The wheel lifting drive units A and B are provided with pressing members 32 and 47 provided on the link rods 10 and 12 of the link mechanism 4, respectively.
And pressing levers 34 and 48 integrally connected to the wheels 24 and 25 and capable of pressing the pressing members 32 and 47. The pressing members 32 and 47 use the levers 34 and 48 as the link mechanism 4 is reduced. Press the levers 34,
By the operation of 48, the wheels 24, 25 can be ascended via the small link rods 37, 52 without fail.

Further, the wheels 25 are located on the shaft 17A side of the lower link rod 10 and on the roller 16 side of the lower link rod 11, that is, on the moving side.
A pressing member 47 for raising the upper link rod.
By providing a pressing member 32 for raising the wheel 24 on the shaft 15 side of the lower link rod 10, that is, on the fixed side, on the shaft 17 side of 12, the pressing members 32, 47 are simultaneously leveraged when the link mechanism 4 is reduced. When the link mechanism 4 is extended, the pressing members 32 and 47 can be separated from the levers 34 and 48 at the same time, so that the wheels 24 and 25 can be separated from the levers 34 and 48 at the same time.
25 can be floated almost simultaneously.

Further, since the pressing lever 7 and the operating valve 8A for operating the hydraulic cylinder 3 are provided on the work table 2,
The lifting drive can be performed while riding on the work table 2.

It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible.

[0021]

According to a first aspect of the present invention, there is provided a base provided with front and rear rods and both side rods, and supporting legs provided at four corners with downwardly directed support legs, and a worktable provided on the base via a link mechanism having a lifting drive device. A wheel provided on the base so as to be able to move up and down via a mounting shaft provided on the inside of the support leg, a pressing member provided downward on a link rod of the link mechanism, and a front and rear rod. A supporting shaft rotatably provided, a connecting rod connecting the pair of mounting shafts to each other in parallel with the side rod, and a base fixed to the support shaft and a distal end opposed to a lower end of the pressing member. A lifting platform device comprising a lever provided to be in contact with, and a small link rod rotatably connecting a substantially center of the lever and the connecting rod, wherein the wheel is raised and lowered. There is no need to provide a separate cylinder, etc. It is possible.

According to a second aspect of the present invention, there is provided the elevator device according to the first aspect, wherein an arc portion is provided at a tip of the lever, and the wheel can be raised and lowered reliably.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an embodiment of the present invention.

FIG. 2 is a front sectional view showing one embodiment of the present invention, in which one wheel is grounded.

FIG. 3 is a front cross-sectional view showing one embodiment of the present invention in a state where one wheel is floating.

FIG. 4 is a side sectional view showing one embodiment of the present invention, in which one wheel is in a ground contact state.

FIG. 5 is a front sectional view showing another embodiment of the present invention, in which the other wheel is in a ground contact state.

FIG. 6 is a side sectional view showing another embodiment of the present invention, in which the other wheel is in a ground contact state.

[Explanation of symbols]

 Reference Signs List 1 base 1A 1B front and rear rods 1C 1D side rods 2 work table 3 hydraulic cylinder (elevation drive) 4 link mechanism 10 11 lower link rod 11 12 upper link rod 22 22A support leg 24 25 wheel 27 42 mounting shaft 31 46 connecting rod 32 47 Pressing member 34 48 Lever 34A 48A Base 34B Arc 35 35 Support shaft 37 52 Small link rod

Claims (2)

(57) [Claims] 1. A base having front and rear rods and both side rods, supporting bases provided at four corners with downwardly directed support legs, a work table provided on the base via a link mechanism having an elevating drive device, and the support legs A wheel provided on the base so as to be able to move up and down via a vertically mounted mounting shaft, a pressing member provided downward on a link rod of the link mechanism, and a rotatably provided between the front and rear rods. A supporting rod, a connecting rod connecting the pair of mounting shafts to each other in parallel with the side rod, and a base fixed to the supporting shaft and a distal end provided so as to face and contact the lower end of the pressing member. A lifting lever device comprising: a lever lever; and a small link rod that rotatably connects a substantially center of the lever lever and the connecting rod. 2. The elevator device according to claim 1, wherein an arc portion is provided at a tip of the lever.