JPS62230597A - Multiple head lifter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-stage lifter that can selectively raise, lower, or stop a load at two or more preset lifts.

[Conventional technology and its problems]

2. Description of the Related Art Generally, in maintenance work on automobiles, etc., a lifter is used that can select a height that allows work to be performed in a comfortable posture depending on the part to be serviced.

As a prior art example of the above-mentioned lifter, there is one shown in FIG. This refuku is configured such that a loft 31 is slidably inserted into a guide tube 30 whose lower end is closed, and is prevented from being removed.
A plurality of mutually connected rubber bellows 34 are attached between a flange 32 provided on the upper outer periphery of the loft 31 and a flange 33 provided halfway on the outer periphery of the guide tube 30, and rubber bellows 34 are connected to each other through air supply and exhaust holes 35 formed in the lower flange 33. bellows 34
The rubber bellows 34 is expanded by supplying air to the inside of the rubber bellows 34.

However, the above-mentioned lift lid has the disadvantage that if it is stopped midway through the lift, it cannot be stably maintained at the adjusted height because the operating source air is compressible.

[Purpose of the invention]

Therefore, this invention solves the above-mentioned inconveniences, and allows for easy maintenance multi-stage lift that can be stopped in stages at preset positions and maintained in a rigid state at each stop position. The purpose is to provide refuku.

[Structure of the invention]

In order to achieve the above object, the present invention connects a plurality of posts with different diameters in a slidable manner to form a telescopic shaft whose upper and lower ends are closed, and between each of the above posts and the outer posts. A stopper mechanism is provided to limit the amount of elevation of the post, a flange is provided on the upper outer periphery of each post, and a bellows that expands and contracts with the inflow and outflow of fluid is installed between this flange and the flange below it, and is formed inside each bellows. forming an inflow and outflow hole communicating with the fluid chamber,
The fluid chamber of the lowermost bellows is configured to communicate with the inside of the telescopic shaft through a passage.

[Operation] The lifter constructed as described above is configured to raise or lower the lifter step by step by controlling the inflow and outflow of fluid into and out of the fluid chambers formed inside the bellows using a TIE fit that corresponds to each bellows separately. Make it.

Now, when fluid is supplied to the lowest bellow among the vertical bellows, the bellows expands and the post inside the bellows moves upward relative to the post outside. As the moving posts rise, the internal volume between the posts increases, so the pressure decreases and the fluid supplied into the bellows flows into the posts from the passage.

Therefore, the post rises smoothly, and when the post rises to a predetermined height, a stopper mechanism provided between the posts is activated and the moving post is stopped. The bellows is then held in an extended state by closing the fluid supply circuit.

- Therefore, by extending each bellows sequentially from the bottom, the lifter can be raised by a predetermined stroke step by step, and by maintaining the internal pressure of each bellows at the set pressure, the A rigid stopping state can be obtained.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a lid that allows the load to be selectively raised and lowered to three lifts.

The lifter includes a telescopic shaft 1. The telescopic axis 1 is
A first post 2, a second post 3, a third post 4, and a fourth post 5 having different outer diameters are sequentially slidably connected, and the lower end of the first post 2 is closed with an end plate 6.

Furthermore, a solid shaft is used as the fourth post 5.

At the top of the outer periphery of each post 2.3.4.5 above is a flange 7.
is provided. The flanges 7 of the second post 3 and the third post 4 have a two-piece structure, and the distance between the flanges is as follows.
It is sealed with a seal 8. Further, the upper flange 7 of the two-piece flange 7 and the flange 7 of the first post 2 are each provided with a guide tube 9 for guiding the movement of the post. The space between the guide tube 9 and the post 4.5 inserted therethrough is sealed by an O-ring 10 attached to the inner diameter surface of the guide tube 9.

Furthermore, a protrusion 11 is provided on the lower surface of each of the lower flange 7 of the two-piece flange 7'' and the flange 7 of the fourth post 5, facing the guide tube 9 below. Due to the contact with the lower guide tube 9, the second post 3 is connected to the first post 2, the third post 4 is connected to the second post 3, and the fourth post is connected to the third post 4.
The amount by which the boss 5 descends is limited.

The second post 3, the third post 4, and the fourth post 5 are provided with a large diameter portion 12 slidable along the inner circumferential surface of the outer post at the lower part of the outer periphery. Part 12
can come into contact with the inner periphery of the lower surface of the flange 7 of the first post 2, and this contact limits the amount of rise of the second post 3 with respect to the first post 2. Further, the large diameter portion 12 of the third post 4 and the large diameter portion 12 of the fourth post 5 are
The upper flange 7° of the second post 3 and the lower inner periphery of the upper flange 7° of the third post 4 can come into contact with each other, and due to this contact, the third post 4 and the fourth post 5
The amount of increase is limited.

Between the flange 7 of the first post 2 and the flange 7 of the second post 3, between the flange 7 of the second post 3 and the flange 7 of the third post 4, and between the flange 7 of the third post 4 and the flange 7 of the fourth post 5. A first rubber bellows to a third rubber bellows 13, 14, 15 are attached in between, respectively, via a tightening ring 16, and each rubber bellows 13, 14, 15 has a plurality of shape-retaining rings 17 attached to its outside. This prevents it from expanding in the radial direction.

By installing the above rubber bellows 13.14.15,
A sealed fluid chamber 18 is formed therein, and a lower flange of each fluid chamber 18 is formed therein. , 7° are provided with inflow and outflow holes 19 communicating with each fluid chamber 18 .

Further, the fluid chamber 18 inside the first rubber bellows 13 and the first
The inside of the post 2 refers to the orifice passage 2 formed in the flange 7 of the first post 2 and the large diameter portion 12 of the second post 2.
The fluid supplied to the fluid chamber 18 flows into the first post 2 from the orifice passage 20 thereof.

The lifter shown in the embodiment has the above structure, and this lifter fixedly supports, for example, the first post 2, the flange 7 of the fourth post 5 supports the load, and each rubber bellows 13.
14. By extension of 15, the load is raised and lowered.

Now, the inflow and outflow holes 1 formed in the flange 7 of the first post 2
When fluid is supplied from 9 to the inside of the first rubber bellows 13, the first rubber hemrose 13 expands and the second post 3 rises. Due to the rise, the internal volume of the telescopic shaft 1 increases and the pressure decreases, so that the fluid in the fluid chamber 18 of the first rubber bellows 13 flows into the interior of the telescopic shaft 1 from the passage 20.

Therefore, the second post 3 rises smoothly, and when the second post 3 rises to a predetermined height, the second post 3 rises smoothly.
The large diameter portion 12 provided at the lower part of the outer periphery abuts against the inner periphery of the lower surface of the flange 7 of the first post 2, and the second post 3 is stopped by this contact. FIG. 2 shows a state in which the first rubber bellows 13 is extended, and in that state, the inflow and outflow holes 1S
By stopping the supply of fluid to and closing the fluid supply circuit, the pressure in the fluid chamber 18 of the first rubber bellows 13 is maintained at a constant pressure. As mentioned above, by setting the pressure to be somewhat higher than the pressure required to lift the load, the extra output after lifting the load is generated by the second post 3.
The large diameter part 12 of the first post 2 is stored as contact pressure on the inner periphery of the lower surface of the flange 7 of the first post 2, and a lifter that is rigid without becoming fluffy even with slight fluctuations in load can be obtained. 5 can be supported extremely stably.

In addition, in the state where the first rubber bellows 13 is extended, by supplying fluid to the internal Φ fluid chamber 18 of the second rubber bellows 14, the second rubber bellows 14 is extended, and the large diameter portion of the third post 4 is The second rubber bellows 14 can be extended to a position where the second rubber bellows 12 comes into contact with the inner peripheral portion of the lower surface of the flange 7 of the second post 3.

Furthermore, by supplying fluid into the inside of the third rubber bellows 15, this third rubber bellows 13 is expanded, and the fourth rubber bellows 13 is expanded.
The third rubber bellows 15 can be extended to a position where the large diameter portion 12 of the post 5 comes into contact with the inner peripheral portion of the lower surface of the flange 7 of the third post 4.

This state is shown in FIG.

Therefore, in the embodiment, the load supported by the fourth post 5 can be selectively raised or lowered to three levels of lift.

In the case of the embodiment, an italifter for three rubber bellows is shown, but the number of rubber bellows is not limited to this, and the fluid supplied to the fluid chamber 18 may be water, oil, or air. By using , water and oil, a rigid suspension can be obtained.

〔effect〕

As described above, the present invention provides flanges on the upper outer periphery of each of the plurality of posts constituting the telescopic shaft, attaches a bellows between each flange and the flange below the flange, and communicates with the fluid chamber inside each bellows. Since the inflow and outflow holes are provided, each bellows can be expanded and contracted independently and sequentially by the inflow and outflow of fluid into and out of the fluid chamber inside the bellows, thereby making it possible to raise and lower the load in stages by a number corresponding to the number of bellows.

In addition, by supplying fluid to the fluid chamber inside the bellows and making it expand, the post inside the bellows simultaneously rises, and when it rises by a predetermined stroke, a stopper mechanism provided between the post and the post outside the bellows is activated. In order to
The load can be reliably moved up and down over a predetermined stroke, and by making the pressure inside the bellows somewhat higher than the pressure required to lift the load, the extra output after lifting the load can be generated by the large diameter part of the post. The contact pressure with the flange of the lower post is stored, and a rigid lifter that does not become fluffy even with slight fluctuations in load can be obtained.

As a result, the load can be stopped and held extremely stably.

Furthermore, since the sliding part of the mechanism is completely protected by rubber bellows, it can be used underwater without worrying about rusting or water contamination with lubricating oil.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a half-sectional view showing an embodiment of the lifter according to the present invention, FIGS. 2 and 3 are half-sectional views showing the same working contact layer, and FIG. It is a sectional view showing a conventional lifter. 1... Telescopic shaft, 2... First post, 3
・・・・・・2nd post, 4・・・・・・3rd post,
5...4th post, 7...flange,
9...Guide cylinder, 11...Protrusion part, 1
2...Large diameter portion, 13...First rubber bellows, 14...Second rubber bellows, 15...
...Third rubber bellows, 18...Fluid chamber, 1
S... Inflow/outlet hole, 20... Orifice passage. Patent applicant: Sumitomo Electric Industries, Ltd. Agent: Kama 1) Text: Part 2, Part 2, Part 1

Claims (1)

[Claims] A plurality of posts with different diameters are sequentially connected in a slidable manner to form a telescopic shaft whose upper and lower ends are closed, and a stopper mechanism is provided between each of the above posts and the posts on the outside thereof to limit the amount of elevation of the posts. A flange is provided on the upper outer periphery of the post, and bellows that expand and contract as fluid flows in and out are installed between the flanges, and an inflow and outflow hole is formed that communicates with the fluid chamber formed inside each bellows. A multi-stage lifter in which the fluid chamber and the inside of the telescopic shaft are communicated through a passage.