JP2583981Y2 - Fluid pressure operated lifting device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for raising and lowering a heavy object such as an air conditioner, and more particularly to a lifting device provided with a telescope type hydraulic cylinder.

[0002]

2. Description of the Related Art An example of this type of hydraulically operated lifting device is disclosed in Japanese Utility Model Laid-Open No. 4-39235. In this prior art, a base tube of a telescopic type hydraulic cylinder is supported on a base, and a load receiving table is provided above a topmost one of a plurality of piston rods of the hydraulic cylinder. By supplying a pressure fluid to the base tube, the plurality of piston rods are extended.

[0003]

[Problems to be Solved by the Invention] In the above prior art,
Since all the piston rods are extended by the supply of the pressurized fluid, there has been a problem that the height of the ascending support provided on the uppermost piston rod cannot be changed. The present invention
An object of the present invention is to make it possible to change the height at which a loading stand of a telescope type hydraulic cylinder is raised.

[0004]

The present invention achieves the above object by, for example, referring to FIGS. 1 to 6, or FIGS.
As shown in (1), the fluid pressure raising / lowering device was configured as follows.

A base tube 10 of a telescopic type hydraulic cylinder 9 is supported on a base 2 and a loading table is provided above the uppermost piston rod 17 among a plurality of piston rods 11... 17 of the hydraulic cylinder 9. In a hydraulically operated lifting / lowering device provided with 21, the upper part 10 a of the base tube 10 and the piston rods 11.
17a, between at least two upper portions 10a and 11a of each of the upper portions 10a and 11a.
A fixing device 37 is provided to prevent the members 1a from relatively extending.

[0006]

The present invention operates as follows, for example, as shown in FIGS. When the telescopic cylinder 9 is extended, when the height of the receiving tray 21 is reduced, the extension of a predetermined one of the plurality of piston rods 11 is prevented by the fixture 37. . Then, the piston rod 11 that has prevented its extension has
, The total stroke of the fluid pressure cylinder 9 is shortened. As a result, the height of the above-mentioned load receiving table 21 is reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an elevation view of a main part of the lifting device. FIG. 1A shows a contracted state, and FIG. 1B shows an extended state. FIG. 2 is an elevational view of the lifting device. FIG. 3 is a perspective view of a lower portion of the above-described lifting device. FIG. 4 is a partial vertical cross-sectional view of the hydraulic cylinder of the above elevating device. 5A and 5B show a fixture of the above elevating device. FIG. 5A is a plan view, FIG. 5B is an elevation view, and FIG. 5C is a side view. 6A and 6B show a loading tray of the above-described lifting device, wherein FIG. 6A is a plan view, FIG.
(c) The figure is a side view.

First, the overall structure of the lifting device will be described mainly with reference to FIGS. 2 and 3. The grounding table 1 includes a cylindrical base 2 and four brackets 3 projecting radially from the base 2. An arm 4 is supported by each bracket 3 so as to be able to swing up and down. A main caster 5 is provided at the tip of the arm 4, and an auxiliary caster 6 is provided below the bracket 3.

The lower part of the base tube 10 of the telescopic type hydraulic cylinder 9 is fixedly fitted in the cylindrical base 2. A loading table 21 is fixed to the uppermost piston rod 17 of the seven piston rods 11 to 17 of the cylinder 9. The receiving table 21 includes a table body 22
And four support pipes 23 assembled in a cross shape in plan view
It is constituted by and.

The base tube 1 of the above-mentioned hydraulic cylinder 9
0, a gas cylinder 27 is connected via a compressed gas supply / discharge hose 25 and a supply / discharge switching control grip 26 (refer to FIG. 6). The gas cylinder 27 is mounted on a support 29 laid on the brackets 3 and attached to the base tube 10 by a Velcro belt 30.

The above-mentioned hydraulic cylinder 9 is configured as follows, as shown in FIG. A plurality of bottomed piston rods 11 to 17 (only 11 to 14 are shown here) are sequentially fitted into the base tube 10. Each piston part 1 of each piston rod 11 to 14
1b to 14b have flow holes 11c to 14c, respectively.
c is formed. Cylinder chamber 1 of base tube 10
The pressure fluid supplied to 0d is sequentially supplied to each of the cylinder chambers 11d to 14d through the above-mentioned flow holes 11c to 14c.

In the above-mentioned fluid-operated lifting device, when lifting an object such as an air conditioner, the object is placed on the load receiving table 21 and then the hydraulic cylinder 9 is operated by operating the control grip 26. Is extended. In order to raise the object to be lifted or lowered along a wall or a corner, the arm 4 may be turned upward by about 90 degrees to jump up almost vertically, and the auxiliary caster 6 may be brought close to the wall surface. When the elevating device is stored, each arm 4 may be flipped up in a vertical state, and the engaging pin 32 of the arm 4 may be engaged with the engaging groove 33 for holding the folded posture. Reference numeral 34 is
A reference numeral 35 denotes an engagement operating tool.

[0013] Between the flange 10a provided on the upper part of the base tube 10 and at least two of the upper flanges 11a to 17a of the piston rods 11 to 17, these flanges are opposed to each other. A fixture 37 is provided to prevent the elongation.

As shown in FIG. 1 and FIG.
7 is provided with divided bodies 38, 38 obtained by equally dividing a cylindrical body into two parts in the direction of the center of the cylinder, and these divided bodies 38, 38 are rotatably connected by hinges 39 so that they can be expanded on both sides. ing. A connecting piece 40 is integrally protruded from an end of the split body 38 on the expanding side, and both connecting pieces 40
Can be joined with a bolt 41 and a nut 42. Inner flanges 43 having an inner diameter substantially equal to the outer diameter of the base tube 10 are protruded from the lower peripheral edge and the upper peripheral edge of each of the above-mentioned divided bodies 38, and a locking piece is 44 is extended.

Then, as shown in FIG. 1A, in a state where the fluid pressure cylinder 9 is contracted, the lower engaging piece 44 is brought into contact with the lower surface of the flange 10a of the base tube 10. Then, the upper locking piece 44 is brought into contact with the upper surface of the flange 11a of the lowermost piston rod 11, and the divided bodies 38 are closed in this state. Thereafter, the hydraulic cylinder 9 is extended. Then, as shown in FIG. 1B, the extension of the lowermost piston rod 11 is prevented, and the maximum extension stroke is shortened by the stroke of the lowermost piston rod 11. In this case, since the lowermost piston rod 11 is fixed to the base tube 10 by the fixture 37,
Even when the object to be lifted is lowered from
1 is prevented from unexpectedly extending.

The fixture 37 may be provided between the base tube 10 and any one of the plurality of piston rods 11 to 17.
It may be provided between any two of the plurality of piston rods described above, and may be provided over three or more piston rods.

The above-mentioned loading tray 21 is configured as shown in FIG. 6 for storing the lifting device. Four holding plates 46 are fixed to the upper surface of the base body 22, and each holding plate 4
The support pipe 23 is inserted into the insertion hole 47 formed in the sixth pipe 6. Reference numeral 48 denotes a clamp. The base body 2 above
The hose 25 and the control grip 26 are attached to a central portion of the hose 2. In this way, the lifting device can store a part of its components in the loading tray 21, so that it can be easily transported and stored in a narrow space.

FIGS. 7 to 9 show two modified examples, and a configuration different from the above-described embodiment will be described. Note that, in these modified examples, members having the same configuration as those in the above-described embodiment are given the same reference numerals in principle.

FIGS. 7 and 8 show a modification of the fixing device 37. FIG. The fixing tool 37 includes two upper and lower rings 5.
1 and 51 are provided. Each ring 51 has an inner diameter larger than the outer diameter of the base tube 10, and connecting pieces 52 are protruded from two opposing portions thereof, and both connecting pieces 52 are connected by bolts 53 and nuts 54. Joined. At the upper and lower peripheral edges of the upper and lower rings 51, inner flanges 43 having an inner diameter substantially equal to the outer diameter of the base tube 10 are protruded, and are locked from the distal end of each inner flange 43. The piece 44 is extended.

Then, as shown in FIG. 7 (a), the lower locking piece 44 is brought into contact with the lower surface of the flange 10a of the base tube 10 while the fluid pressure cylinder 9 is contracted. The upper locking piece 44 is brought into contact with the upper surface of the flange 11a of the lowermost piston rod 11, and in this state, the upper and lower rings 51
4 to join. Thereafter, the above-mentioned fluid pressure cylinder 9
Is extended. Then, as shown in FIG. 7B, the extension of the lowermost piston rod 11 is prevented, and the maximum extension stroke is shortened by the stroke of the lowermost piston rod 11.

As shown by the dashed line in FIG.
The upper ring 51 may be configured to engage with the flange 12a of the second piston rod 12 from the bottom, and the piston rod 12 may be fixed to the base tube 10. In this case, the total stroke can be shortened by the length obtained by adding the strokes of the two piston rods 11 and 12. Further, by providing an upper ring to which a plurality of the piston rods 11 to 17 can be fixed and appropriately selecting them, a stroke according to the use can be set.

FIG. 9 shows a modification of the above-mentioned load receiving table 21. Two support pipes 23 are accommodated in each of the left and right sides of the upper surface of the base body 22, and the hose 25 and the control grip 26 are housed in the center of the base body 22.

[0023]

The present invention has the following effects because it is constructed and operates as described above. When the telescopic type hydraulic cylinder is extended, a predetermined one of the plurality of piston rods can be prevented from being extended by the fixture. For this reason, the total stroke of the fluid pressure cylinder can be shortened by the stroke of the piston rod whose extension is prevented, and the height of the load receiving table provided above the uppermost piston rod can be easily changed.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a main part of an embodiment of a lifting device according to the present invention, wherein FIG. 1 (a) shows a contracted state, and FIG. 1 (b) shows an extended state.

FIG. 2 is an elevation view of the lifting device.

FIG. 3 is a perspective view of a lower portion of the elevating device.

FIG. 4 is a partial longitudinal sectional view of a hydraulic cylinder of the elevating device.

5 (a) is a plan view, FIG. 5 (b) is an elevation view, and FIG. 5 (c) is a side view.

FIGS. 6A and 6B show a loading tray of the lifting device, wherein FIG. 6A is a plan view, FIG. 6B is an elevation view, and FIG.

FIG. 7 is a view showing a modification of the above elevating device and corresponding to FIG. 1 described above.

FIG. 8 is a view showing a fixture of the elevating device and corresponding to FIG. 5 described above.

FIG. 9 is a view showing a modification of the above-mentioned loading tray and corresponding to FIG. 6;

[Explanation of symbols]

2 ... Base, 9 ... Hydraulic cylinder, 10 ... Base tube,
10a: Upper part (flange), 11 to 17: Piston rod, 11a to 17a: Upper part (flange), 21: Receiving stand, 37: Fixing tool.

Claims (1)

(57) [Scope of request for utility model registration] 1. A base tube (10) of a telescopic type hydraulic cylinder (9) is supported on a base (2), and a plurality of piston rods (11... 1) of the hydraulic cylinder (9) are provided.
7) In a fluid pressure-operated lifting device in which a loading table (21) is provided above the uppermost piston rod (17), the upper part (10a) of the base tube (10) and each of the above Each upper part (11a ... 17a) of the piston rod (11 ... 17)
A fixture (37) is provided between at least two of the upper portions (10a) and (11a) to prevent the upper portions (10a) and (11a) from extending relatively to each other. Hydraulically operated lifting device.