JPS61159382A - Manual hydraulic tool - 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 portable manual hydraulic tool used for compressing or cutting a clamped object. Electric wire W held on a steel tower! Suitable for use in continuous work, etc.

[Conventional technology]

Japanese Patent Publication No. 58-28074 is known as a technique for the same purpose, in which hydraulic pressure and a spring are used in combination to cause the ram to move rapidly. Therefore, the speed of the ram cannot be adjusted arbitrarily. Although this rapid traverse is effective when compressing electrical wires that are fixed on the ground using dies that are in the correct position, this type of tool is generally used in extremely unnatural postures when working on high-altitude steel towers. For this reason, when placing the wire in the die, it is necessary to temporarily compress the wire while correcting its position. Therefore, with a tool that uses a spring, if the switching handle is turned inadvertently, the ram will forcefully pop out, which is dangerous, and it is difficult to set the wire in the correct position. Furthermore, because of the reaction force of the spring, the ram cannot be held in a desired position, making assembly and disassembly difficult.

[Problem that the invention seeks to solve]

The speed of the ram can be adjusted arbitrarily. Even when rapid feed is required, the use of an oil-based 5-pressure weir eliminates the need for springs.

〔Example〕

As shown in the figure, the present invention has vjK and a ram 2 attached to one end of the main body 1.
, a cover 3 and a grip 4 are provided at the other end, and a plunger pump lever 5 is provided on the side.

The main body 1 has an open cylinder 1a at one end, and a cover 3 at the other end.
The oil ga is formed between the two. Ram 2 is cylinder 1a
It is possible to form an oil chamber C at the bottom. The ram 2 is also provided with a cylindrical cavity 2a on the bottom side. piston 6
protrudes into the cylinder 1a and is fixed to the main body 1, is provided with an oil chamber at the @ part, and can form an oil chamber e at the top. The sub-cylinder 7 is fitted around the outer periphery of the piston 6, and forms an annular oil chamber d between the stepped small-diameter inner end portion 7a and the stepped large-diameter outer end portion 6a of the sub-cylinder 7. The oil chamber d communicates with the oil chamber d through a hole passing through the piston. There is a suitable annular gap between the sub-cylinder 7 and the cylindrical cavity 2a of the ram, and both are locked by a coupling fitting 8, and the oil 1ic and the oil chamber e communicate through this gap. The main body 1 has a suction valve 9 and a discharge valve 10, and a plunger pump P is installed in the passage connecting the two.
but! ! ! Store. Oil sucked into the suction valve 9 from the oil chamber a by the operation of the pump P is sent to the oil chamber from the discharge valve 10. The main body has a switching valve 11 and a relief valve 12 separately.
This is the provision. The switching valve 11 has two valve seats 11a and 11b that communicate with the oil chamber a and the oil chamber su, respectively, and a passage d511c that communicates with the oil chamber C, with a ball 13 inside.
is stored. A female thread is cut in the center of the main body 1 on the oil chamber ia side, and an oil passage 17 is bored through the oil chamber a and the switching valve 11. The relief valve 12 is interposed in the passage from the oil chamber A to the oil chamber a. The tip of the valve stem 14 faces the switching valve 11 from the valve seat 11g side. Valve stem 1
4 slidably passes through the cover 3, has a male thread cut at its tip, and is screwed into the central female thread of the main body 1. A key 15 is fixed to the valve stem 14. The grip 4 has a long groove 4a cut at its end, which engages with the key 15 of the valve stem 14 and transmits rotation so that the valve stem 14 can move forward and backward. That is, the valve stem 14 moves forward and backward by the left and right rotation of the grip 4. valve s14
The advancing/retracting mechanism is not limited to this, for example, as shown in FIG. 3, the valve stem 14 may be divided into a tip i4a and a base 14b so that only the tip 14t can move back and forth. Although not shown, the threaded part between the valve stem X4 and the main body 1 is removed,
As an eyebrow pressure device, a passage is established that connects the switching valve to the tube 16 only by moving the grip 4 in the axial direction. , a cylinder structure that utilizes the pressure oil at that time may be used.

The present invention is configured as described above. When the valve stem is advanced and the valve seat 11b is closed, the oil supplied by the pump P flows from the oil gb to the oil chamber d, and the ram along with the sub cylinder is moved to the cylinder 1a.
draw it into. When the valve stem is completely retracted and the valve seat 11a is closed, the oil in the oil chamber exits through the passage 11c to the oil chamber C and further to the oil chamber e, pushing the ram out of the cylinder. At this time, oil also flows into the oil chamber d, but the force that causes the ram to retract is much smaller than the extrusion force of the ram, so extrusion is carried out without any problem.

FIG. 2 shows the situation when the ram begins to be fast forwarded. The valve stem moves back slightly and the valve! l! 11 m + 11 b
Both are open. Tube 16 is filled with Jf
The forced oil is ejected from the valve seat 11a into the switching valve chamber.

The oil discharged by the pump P also flows into the same chamber from the valve seat 11b. The two merge and flow to the passage 11c, and the oil chamber C and the oil chamber C
Press to fast forward the ram. When the ram comes into contact with the workpiece between the two, the valve stem is moved back to close the valve seat 11a, and the pump P is operated to perform compression feeding. If the pump continues to operate after completion of compression, the relief valve 12 opens and the oil flows back to the oil chamber a. Here, the valve stem is moved forward to close the valve seat 11b. The oil flows to the oil chamber d and is pushed back by the ram, and the oil in the oil chamber C flows back to the oil chamber a via the passage 11C, and the oil flows through the tube 16.
expand. This completes one cycle. tube 16
As described above, the tube contributes to rapid forwarding, but if rapid forwarding is not particularly required, the tube may be omitted.

〔effect〕

The speed of the ram can be adjusted arbitrarily by rotating the grip. Since all operations are hydraulic, the 6-set type is also easy to operate.

[Brief explanation of drawings]

FIG. 1 is a front view of the hydraulic tool, FIG. 2 is a detailed front view of the main parts, and FIG. 3 is another embodiment of the valve stem advancing/retracting mechanism. 1... Body, 2... Ram, 3... Cover, 4
...Grip, 5...Lever, 6...Piston,
7...Sub cylinder, 8...Joining metal fittings, 9...
...Suction valve, 10...Discharge valve, 11...Switching valve, 11a, tlb...Valve seat, 1], c...
Passage, 12... Relief valve, 13... Ball,
14... Valve stem, 15... Key, 16...
...Tube, 17 ...Oil passage, a, b, c,
d...Oil chamber, P...Plunger pump. Fig. 3 140 14b

Claims (1)

[Scope of Claims] A main body having an open cylinder at one end and a cover forming an oil chamber a at the other end; A ram provided with a body, a piston that protrudes toward the center of the cylinder and is fixed to the main body and has an oil chamber b at the bottom and an oil chamber e at the top, and an oil chamber b.
A sub-cylinder is fitted onto the outer periphery of the piston to form an annular oil chamber d that can communicate with the sub-cylinder and is secured to the cylindrical cavity of the ram so that both oil chambers c and e can communicate with each other, and a sub-cylinder that sends pressurized oil to the oil chamber b. A plunger pump to be inserted into the oil chamber, a passage communicating from oil chamber b to oil chamber a via a relief valve, a valve stem supported on the main body cover so as to be able to move forward and backward, and a cylindrical structure that is also supported on the cover and that can control the movement of the valve stem back and forth. a grip, a switching valve capable of shutting off oil sent from oil chamber b or switching oil to oil chambers a and c, respectively, by advancing and retreating the valve stem, and a high-pressure device housed in the grip and communicating with oil chamber a. A manual hydraulic tool that moves the ram forward and backward by operating the grip.