JPH0238737B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fluid pressure support used for the purpose of supporting the concrete frame of the floor of each floor of a concrete building, or supporting the earth retaining plates applied to both side walls of an open trench dug in the ground. Although it looks like a long cylinder without a handle on the outside, it has a fluid tank inside and a cylinder that extends the ram using fluid pressure.
The cylinder is equipped with a cylinder-type compression pump or the like that sends pressurized fluid to the cylinder, and when the ram is extended, the compression pump is driven by a handle such as a rod that is inserted from the outside and the fluid is sent into the cylinder, thereby causing the ram to extend. After extending the telescopic cylinder fitted around the outer periphery, the handle is removed to create the appearance of an elongated cylinder, and when the support is removed, it can be opened and closed by external operation without using the already removed handle. The structure is such that the valve is opened and the pressure fluid filled in the cylinder is returned to the fluid tank to control the contraction of the telescopic cylinder. The objective is to provide a well-organized fluid pressure supporter that maintains the diameter.

Conventionally, in a hydraulic jack that has the same purpose as the present invention, the hydraulic pump is operated by operating a non-removable handle provided in the center of the outer circumference, and the oil from the built-in oil tank is sent to the front of the ram of the hydraulic cylinder. A structure in which the head metal fitting and the ram extend together is disclosed in Japanese Utility Model Application Publication No. 51-93572.
Since the handle cannot be removed, it not only becomes an obstruction when the ram is extended, but also because the thin ram extends in the axial direction, even if the head fitting is formed to the same diameter as the hydraulic cylinder, etc. There are drawbacks such as unevenness occurring in the axial direction when the ram is extended.
As described above, the present invention is different from the conventional ones in that the entire ram can maintain approximately the same diameter both when it is extended and when it is contracted.

An embodiment of the present invention will be described.

1 in the figure shows the cylindrical support body.
The fluid pressure operation tube 2, the switching valve tube 3, and the fluid pressure operation tube 4 are connected in the axial direction, and one end of the fluid pressure operation tube 4 is connected at the center of the interior to the center of one side of the switching valve tube 3. A fixed cylinder 5 is provided, and a telescopic cylinder 6 that can freely expand and contract is fitted on the outside of the fluid operating cylinder 4.

The above-mentioned fluid pressure operating cylinder 2 and the telescopic cylinder 6 fitted onto the fluid pressure operating cylinder 4 have approximately the same outer diameter.

The switching valve cylinder 3 is composed of a circular bracket 11 having an outer diameter slightly larger than the fluid pressure operation cylinder 2 and the telescopic cylinder 6, and an axially stepped insertion hole 12 is provided through the bracket 11 so that the switching valve cylinder 3 can be operated by fluid pressure. The insertion tube 22 whose side surface is engaged with the collar 23 of the cylinder-type compression pump tube 21 protruding into the tube 4 is fitted into the insertion hole 12 . The insertion tube 22 is provided with a fluid feed hole 25 having a slightly smaller diameter and connected to the piston sliding hole.

Inner and outer annular protrusions 16 and 17 are provided on the end face of the bracket 11 on the side of the fluid pressure actuating cylinder 4, and one end of the fluid pressure actuating cylinder 4 described above is fitted and fixed to the outer annular protruding piece 17, and the inner annular protrusion 4 is fixed. One end of the cylinder 5 located at the center of the hydraulic cylinder 4 is fixed to the projecting piece 16, and a donut-shaped plate 33 is provided around the outer periphery of the cylinder.
A ram 34 is fixed to the end of the operating cylinder 4 by welding or the like to form a fluid tank 36 between the cylinder 5 and the fluid pressure operating cylinder 4, and a ram 34 is fitted into the cylinder 5 and protrudes from the end of the cylinder. The end plate 35 is fixed to the end of the telescopic cylinder 6 by welding or the like, so that the ram 34 and the telescopic cylinder 6 can expand and contract as one. The above fluid feed hole 25 is connected to the cylinder 5 via the first check valve 28.
A discharge hole 43 provided in the switching valve cylinder 3 is connected in front of the ram 34 . The first check valve 28 has a ball valve in contact with the valve seat 26 by a spring applied from the cylinder 5 side.

The bracket 11 is provided with a fluid movement path 14 that surrounds the insertion hole 12 and the discharge hole 43, and communicates with a three-way open valve port pipe 39 that is fitted into the movement path 14 with a portion thereof communicating. communicates with the fluid tank 36 through the suction port 37 and the fluid guide pipe 47 inserted into the fluid tank 36, and communicates one side of the valve port pipe 39 through the cutout 25a of the front fluid feed hole 25 and the communication hole 38, A second check valve 42 is provided which presses the ball valve against a valve seat 40 on the valve port pipe 39 side by a spring 41. The outer periphery of the fluid movement path 14 is closed by a ring plug 15.

The fluid pressure operation tube 2 connected to the annular protrusion 18 of the bracket 11 has a handle insertion hole 20 on its outer periphery through which a rod-shaped handle 50 can be freely inserted and removed, and one end of the piston 30 fitted in the compression pump tube 21 is provided inside. A rocking piece 32 is pivotally connected to a link 29 whose one end is fitted into a forked groove 24 provided on the outer periphery of the collar 23 and is pivotally supported.
A handle insertion tube 31 is provided which is integrated with the switching valve tube 3.
The end plate 19 is fixed to the open opening on the opposite side of the connecting portion.

A part of the fluid movement path 14 of the bracket 11 is connected to the discharge port 43, and a reflux hole 8 passes through the wall portion 13 provided on the fluid pressure operating cylinder 4 side of the movement path 14.
is provided in communication with the fluid tank 36, and is provided with an on-off valve 10 that is pushed by a set screw 9 screwed into a notch of the ring plug 15 to close a portion where the fluid movement path 14 communicates with the discharge hole 43. The on-off valve 10
When the push screw 9 constituting the push piece is manually released to release the pressure on the on-off valve 10, the discharge hole 43 is connected to the reflux hole 8.
communicate with.

A bifurcated guide pipe 44 extending toward both ends of the fluid tank 36 is connected to the fluid guide pipe 47 described above, and ball valves 48 and 49 are fitted into the openings 45 and 46, respectively. The bifurcated guide tube 44 and the fluid guide tube 47 allow fluid to be completely sucked in even if either the end plate 19 or the end plate 35 of the support body 1 is placed upward. use it facing upwards,
Or, it is not needed when the support body 1 is used horizontally.

FIG. 2 shows a mode of use in which the support body 1 is held horizontally and the ram is extended. In this drawing, the hydraulic cylinder 4 is shown to have a small diameter, but in reality, as shown in FIG. 1, the outer diameter of the telescoping cylinder 6 hardly changes.

To explain the operation of this embodiment, when the on-off valve 10 is closed by the set screw 9, the handle insertion hole 20
The handle 50 inserted from the handle insertion tube 31
When the piston 30 is reciprocated, the first check valve 28 is closed when the piston moves to the left, and the second check valve 42 is opened to compress the oil in the fluid tank 36 into the pump cylinder 21. When moving to the right, the second check valve 42 is closed, the first check valve 28 is opened, and compressed oil is fed into the cylinder 5. By repeating this, the ram 34 and the end plate 35 are pushed, and the telescopic cylinder 6 Stretch.

Furthermore, when the pressure on the on-off valve 10 by the set screw 9 is released, the compressed oil in the cylinder 5 passes through the return hole 8, the fluid movement path 14, and the discharge hole 43, and flows into the fluid tank 36.
The ram 34, end plate 35, and telescoping cylinder 6 can be expanded and contracted. The contraction operation becomes more accurate by interposing the contraction assisting spring 51 between the cylinder 5 and the ram 34.

The present invention has a switching valve cylinder 3 in the center of the fluid pressure operating cylinder 4.
A cylinder 5 with one end fixed to the cylinder 5 is provided, and a donut-shaped plate 33 provided on the outer periphery of the cylinder 5 is fixed to the end of the fluid pressure cylinder 4 to form a fluid tank 36 between the cylinder 5 and the fluid pressure cylinder 4. Therefore, there is no need to lengthen the cylindrical fluid pressure support for the arrangement of the fluid tank 36, and the extensible cylinder 6 is fitted around the outer periphery of the hydraulic cylinder 4, and the cylinder 5 is By fixing the end plate 35 of the fitted ram 34 to the end face of the telescoping cylinder 6 so that the ram 34 and the telescoping cylinder 6 can expand and contract together, the fluid pressure support can also be retracted. Even when extended, it can maintain a cylindrical shape with almost the same diameter without unevenness, and there is no risk of catching the worker's clothes or workpieces. Further, the handle 50 for reciprocating the piston 30 fitted in the cylinder type compression pump tube 21 protruding from the switching valve tube 3 into the fluid pressure operation tube 2 is used only when the ram 34 is extended.
Since the handle 50 can be removed and placed not only when the ram 23 is retracted but also when the ram 34 is extended and in use, the handle 50 that forms a protrusion of the fluid pressure support 1 can be eliminated. It can be made without creating irregularities in the outer shape together with the telescopic cylinder 6, and can eliminate obstacles to work other than when the ram 34 is being extended. The insertion tube 31 serves to maintain the cylindrical configuration of the hydraulic support body 1 as described above. Also, when the ram 34 is contracted, the opening/closing valve 1 is operated by a pressing piece operated from the outside.
It has the effect that it is only necessary to loosen 0.

[Brief explanation of drawings]

The accompanying drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal side view showing the left half and right half, and FIG. 2 is a side view showing an example of the state of use. 1 → Support body, 2 → Fluid pressure operation cylinder, 3 → Switching valve cylinder, 4 → Fluid pressure operation cylinder, 5 → Cylinder, 6 →
Telescoping cylinder, 8 → return hole, 10 → opening/closing valve, 12 → insertion hole, 14 → fluid movement path, 19 → end plate, 20 → handle insertion hole, 21 → compression pump cylinder, 25 → fluid feed hole, 28 → first check valve, 30 → piston, 3
1 → Handle insertion tube, 32 → Rocking piece, 33 → Donut-shaped plate, 34 → Ram, 35 → End plate, 36 → Fluid tank, 39 → Valve port pipe, 42 → Second check valve, 43
→Discharge hole, 50 → Handle.

Claims (1)

[Claims] 1 Fluid pressure operation tube 2 and switching valve tube 3 with approximately the same outer diameter
and a fluid pressure actuating cylinder 4 are arranged to be connected in the axial direction, and a cylinder 5 with one end fixed to the switching valve cylinder 3 is provided in the center of the fluid pressure actuating cylinder 4, and a donut is provided on the outer periphery of the cylinder 5. The shape plate 33 is connected to the hydraulic cylinder 4
The cylinder 5 and the fluid pressure actuating cylinder 4 are fixed to the end portion of the
A fluid tank 36 is configured between the fluid pressure actuating cylinder 4
The telescopic cylindrical body 6 is fitted around the outer periphery of the cylinder 5.
The end plate 35 of the ram 34 fitted in the telescopic cylinder 6
The ram 34 and the telescoping cylinder 6 can be extended and contracted together by being fixed to the end face of the cylinder, and the cylinder-type compression pump cylinder 21 attached to the switching valve cylinder 3 protrudes inside the fluid pressure operation cylinder 2. a swinging piece 32 that swings together with an insertion tube 31 into which a handle that is freely inserted and removed from the handle insertion hole 20 is fitted;
A piston 30 connected to the swing piece 32 and inserted into the pump cylinder is provided, and the fluid feed hole 25 of the compression pump cylinder 21 is connected to the front side of the ram 34 of the cylinder 5 via the first check valve 28. The switching valve cylinder 3 is provided with a discharge hole 43 that opens on the front side of the ram 34, and a fluid movement path 14 that surrounds the fluid feed hole 25 and the discharge hole 43 and communicates with the fluid tank 36. 14 in front of the first check valve 28 through the second check valve 42 and communicates with the fluid feed hole 25, and the discharge hole 43 communicates with the movement path 14 and the movement path 14. through the fluid tank 36,
A fluid pressure support characterized in that an opening/closing valve 10 is provided in a communication portion between a fluid movement path 14 and a discharge hole 43, and the opening/closing valve 10 is configured to control either communication or cutoff by a press piece operated from the outside.