JP2535526Y2 - Portable hydraulic compressor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic compressor, and more particularly to an improvement of a portable hydraulic compressor in which a member to be compressed such as a pipe joint is manually set between compression dies to perform compression processing. Things.

[0002]

2. Description of the Related Art For example, at a plumbing site of a plumbing pipe,
In order to compress and join together a pipe joint portion in which one and the other of the pipes are overlapped on the inside and the outside, or a pipe joint member with a pipe end inserted from both sides,
2. Description of the Related Art A portable hydraulic compressor integrally formed with a small hydraulic pressure generating unit is known. A portable hydraulic compressor 200 shown in FIG. 14 is an example of the above. A pair of support frames 206 integrally fixed on the front side of a hydraulic cylinder 204 that drives an output rod 202 forward to drive the hydraulic rod are respectively provided. Support shaft 208 perpendicular to the center line of cylinder 204
A pair of jaws 210 are provided so as to be rotatable around, and a compression die 212 is attached to each end of the jaws 210. The pair of jaws 210
It is connected to a slide member 214 fixed to the output rod 202 via a pair of links 216, and the distal end thereof is closed as the output rod 202 is driven to protrude. FIG. 15 shows the hydraulic cylinder 2
It is a figure showing the state where oil pressure of 04 was released. In these figures, the hydraulic cylinder 204 is integrally fixed to a hydraulic pressure generating unit (not shown) on the right side.

[0003]

However, when the portable hydraulic compressor 200 performs compression processing,
As shown in FIG. 15, when the output rod 202 of the hydraulic cylinder 204 is held at the retracted position and the pair of jaws 210 are opened in advance, and when the jaws 210 are closed, the compression die 2 is closed.
14 so as to be able to satisfactorily compress the member to be compressed.
Thus, it was necessary to position 00 and the member to be compressed in an appropriate positional relationship. For this reason, for example, one compression die 214
It is sometimes started with the member to be compressed in contact with it, but depending on the situation at the piping site, there are places that are not clearly visible due to narrow places and obstacles, It is difficult to compress well when the contact state is incomplete, or when there is misalignment or misalignment of the squareness.

The present invention has been made in view of the above circumstances, and an object of the present invention is to enable easy and accurate mutual positioning before starting.

[0005]

In order to achieve the above object, the gist of the present invention is as follows: (a) a hydraulic cylinder for driving the output rod to protrude forward; and (b) a hydraulic cylinder for protruding forward from the hydraulic cylinder. (C) respectively disposed on the support frame so as to be rotatable about a support axis perpendicular to the center line of the hydraulic cylinder, and (D) biasing means for constantly biasing the pair of jaws in a direction in which the distal ends of the pair of jaws are closed,
(E) The pair of jaws are respectively connected to the other end portions of the pair of jaws opposite to the distal end portions with the support shaft interposed therebetween so as to be relatively rotatable around a connection shaft parallel to the support shaft, and separated from the connection shaft. A pair of links for opening and closing the pair of jaws by reciprocating an engaging portion provided at a set position in a direction parallel to the center line, and (f) connecting the engaging portion to the center line in parallel with the center line. Guide means for guiding in a suitable direction and supporting the pair of jaws so that they can reciprocate between a forward position where the pair of jaws are closed and a rear position where the pair of jaws are opened; (g)
The output rod is provided integrally with the output rod, and when the output rod is driven to protrude, the output rod is brought into contact with the engagement portion to press the pair of jaws in the closing direction, while the output rod is held at the retracted position. And a contact member that allows the engaging portion to reciprocate between the front position and the rear position.

[0006]

In such a portable hydraulic compressor, when the output rod of the hydraulic cylinder is held at the retracted position, the engaging portion of the pair of links connected to the pair of jaws is guided by the guide means. It is allowed to reciprocate between the front position and the rear position while holding the other end of the pair of jaws with one hand, for example, so as to oppose the urging force of the urging means. Of the jaw can be opened. Therefore, if the relative position between the compressor and the member to be compressed is adjusted so that the member to be compressed is located between the compression dies in that state, then the force of the hand that opened the pair of jaws is relaxed, The member to be compressed is sandwiched between the compression dies according to the urging force of the urging means. As described above, the member to be compressed is sandwiched between the compression dies,
If the positional relationship between the compression die and the member to be compressed is correctly determined, and the output rod of the hydraulic cylinder is protruded and driven in that state, the abutting member is brought into contact with the engaging portion and the pair of jaws is moved in the closing direction. The member to be compressed is pressed and compressed between the compression dies.

[0007]

As described above, according to the portable hydraulic compressor of the present invention, the member to be compressed can be sandwiched between the compression dies before the compression working by the hydraulic cylinder.
Correct positioning of the positional relationship between the compression die and the member to be compressed can be easily performed, workability in a narrow place or a place difficult to see is improved, and processing defects due to positioning errors are reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. 1 and 2 are a front view and a plan view showing a portable hydraulic compressor 10 (hereinafter simply referred to as a compressor 10) according to an embodiment of the present invention. The compressor 10 is turned on only while the grip portion 12 and the switch 14 provided on the grip portion 12 are pressed.
A first housing 20 that houses a pump driving electric motor 16, a gear mechanism that transmits the rotational force of the electric motor 16, and a tank 18, and a second housing that houses a hydraulic pump and valves. 22 and
The hydraulic cylinder 24 and the tool head 26 are integrally provided.

FIG. 3 is a longitudinal sectional view of the first housing 20 and the second housing 22. As is apparent from FIG. 3, the housings 20 and 22 include:
A rotation shaft 34 to which the rotation of the output shaft 28 of the electric motor 16 is transmitted via the gears 30 and 32 is rotatably held, and a pump chamber 36 is provided in a direction orthogonal to the rotation shaft 34 to provide hydraulic pressure. A plunger 40 of the pump 38 is fitted so as to be movable in the axial direction. The plunger 40 is
A compression coil spring 44 interposed between the plug 42 and the pump 42 forms a pump chamber 36. The compression coil spring 44 constantly urges the compression shaft 44 toward the rotation shaft 34, and contacts a eccentric cam 46 provided on the rotation shaft 34 via a needle bearing 48. Contacted,
When the rotating shaft 34 is rotationally driven by the electric motor 16, the rotating shaft 34 is reciprocated in the axial direction to increase or decrease the volume of the pump chamber 36. The pump chamber 36 is provided in the second housing 22.
4 and FIG. 5 showing a VV cross section of FIG. 4, the hydraulic oil is allowed to flow into the pump chamber 36 but is prevented from flowing out through a check valve 50. The check valve 5 allows the outflow of the hydraulic oil from the pump chamber 36 but prevents the inflow while the hydraulic oil is in communication with the suction oil passage 52.
Hydraulic oil is sucked from the suction oil passage 52 and discharged to the discharge oil passage 56 as the volume of the plunger 40 increases or decreases due to the reciprocating movement of the plunger 40.

The suction oil passage 52 is opened to an oil storage chamber 58 shown in FIG. 3, and the oil storage chamber 58 is connected to the tank 18 via an oil path 60.
The tank 18 has a bottomed cylindrical metal housing 62 whose opening is screwed into the first housing 20, and is accommodated in the housing 62 and the opening is fixed to the inner wall surface of the housing 62 by a seal ring 64. And a bottomed cylindrical rubber tank 66. The oil storage chamber 58 is communicated with the rubber tank 66. The rubber tank 66 is filled with hydraulic oil, and is expanded and contracted according to the amount of the oil. The housing 62 has a ventilation hole 68 for communicating the inside with the atmosphere.

On the other hand, the discharge oil passage 56
The switching valve 70 shown in FIG.
Is communicated with the valve chamber 72. Valve chamber 72
Is a diagram in which an opening of a bottomed circular hole formed in the second housing 22 is closed by a plug 74, and the discharge oil passage 56
Is opened at the lower end of the valve chamber 72, that is, at the end on the plug 74 side. A main valve body 76 is fitted in the valve chamber 72 so as to be slidable in the axial direction. The main valve body 76 is constantly urged toward the plug 74 by a compression coil spring 78. A circular hole 80 with a bottom is formed in the main valve body 76 from the end on the side of the plug 74.
A small circular hole is formed at the bottom of the 0, and a needle valve type sub-valve 84 is disposed so as to be movable in the axial direction. The auxiliary valve body 84 is always urged by a compression coil spring 86 inserted between the auxiliary valve body 82 and the plug 74 in a direction opposite to the plug 74, that is, in a direction to protrude from the main valve body 76. The protrusion provided on the bottom of the circular hole 80 is prevented from projecting by a predetermined amount or more. The spring force of the compression coil spring 86 is sufficiently weaker than that of the compression coil spring 78, and the main valve body 76 is actuated via the auxiliary valve body 84.
6 is always moved to the plug 74 side against the urging force of No. 6 and is fitted to the protruding shaft 82. An oil supply / discharge passage 8 communicating with the hydraulic cylinder 24 is provided at an intermediate portion of the valve chamber 72.
8 is opened, and a discharge oil passage 90 communicating with the oil storage chamber 58 is opened at an end opposite to the plug 74, and a plurality of passages are formed in a cylindrical portion of the main valve body 76. An oil hole 92 is provided. The sub-valve 84 is provided with a plug 7
4 is moved in the opposite direction to the discharge oil passage 90.
, And closes the discharge oil passage 90. In addition, FIG.
It is a figure corresponding to IV section.

The switching valve 70 configured as described above is
When the hydraulic pump 38 is operated by the electric motor 16 and hydraulic oil is supplied from the discharge oil passage 56 into the valve chamber 72, the hydraulic pressure causes the main valve body 76 to resist the urging force of the compression coil spring 78. It is moved in a direction away from the plug 74, and as shown in FIG.
4 closes the opening of the discharge oil passage 90 in accordance with the urging force of the compression coil spring 86, and moves the main valve body 76 to a position where the protruding shaft 82 relatively comes out of the circular hole 80. Crevice with circular hole 80 and oil passage hole 9
The discharge oil passage 56 is communicated with the supply / discharge oil passage 88 via the second passage 2. As a result, the hydraulic oil pumped from the hydraulic pump 38 is supplied to the hydraulic cylinder 24. When the electric motor 16 is stopped and hydraulic oil is no longer supplied from the hydraulic pump 38, the main valve body 76 is moved toward the plug 74 according to the urging force of the compression coil spring 78, and is shown in FIG. As described above, the protruding shaft 82 is relatively fitted into the circular hole 80 of the main valve body 76, and the sub-valve body 84 resists the urging force of the compression coil spring 86 with the movement of the main valve body 76. Then, it is separated from the opening of the discharge oil passage 90, and the discharge oil passage 90 and the supply / discharge oil passage 88 are communicated. This allows the working oil in the hydraulic cylinder 24 to return to the oil storage chamber 58 and further to the tank 18 via the supply / discharge oil passage 88 and the discharge oil passage 90. In addition, circular hole 8
A predetermined gap is provided between the inner peripheral surface of the shaft 0 and the outer peripheral surface of the protruding shaft 82, and the main valve body 76 can be returned to a position where the main valve body 76 abuts on the plug 74 by flowing hydraulic oil through the clearance. It has become.

A relief valve 94 is provided in the second housing 22 and is connected to a supply / discharge oil passage 88 via a branch oil passage 96. This relief valve 94
Is provided with a relief valve 100 which always closes the opening of the branch oil passage 96 by a compression coil spring 98. When the oil pressure in the supply / discharge oil passage 88 becomes higher than necessary, the relief valve 100 is provided. Is pushed back against the urging force of the compression coil spring 98, thereby opening the opening of the branch oil passage 96 and discharging the hydraulic oil in the supply / discharge oil passage 88 to the discharge oil passage 102.
From the oil storage chamber 58.

On the other hand, as shown in FIG. 8, the hydraulic cylinder 24 has a front side in a cylinder housing 110 including an inner tube 106 having a cylinder bore 104 formed therein and an outer tube 108 fitted outside the inner tube 106. That is, a piston 114 integral with an output rod 112 protruding leftward in FIG. 8 is slidably provided. The inner tube 106 has a bottomed cylindrical shape, and is fixed to the end surface of the second housing 22 by three bolts 118 on the bottom 116 side, and has a piston 114 and an output The pressurizing chamber 122 (see FIG. 13) formed in the meat hole 120 formed in the center of the rod 112 and on the bottom 116 side in the cylinder bore 104 and the oil supply / discharge passage 88 of the second housing 22 are connected. A communication hole 124 for communication is provided. The inner tube 10
The inner tube 6 and the outer tube 108 are inserted by a wire 126 such as a piano wire inserted between a pair of annular grooves provided so as to form an annular passage having a circular cross section when both are fitted. An outer tube 108 is connected to the tube 106 so as not to be detachable in the axial direction and relatively rotatable around the axis. For this reason, the outer tube 1 around the axis of the hydraulic cylinder 24
08 In addition, the posture of the tool head 26 can be easily changed according to the working conditions and the like.

A compression coil spring 128 is disposed between the piston 114 and the outer tube 108 around the output rod 112. When hydraulic oil is supplied into the pressurizing chamber 122, the piston 114 The output rod 112 against the urging force of the compression coil spring 128
When the hydraulic pump 38 is stopped and the hydraulic pressure of the hydraulic oil is reduced while the hydraulic pump 38 is stopped, the piston 114 is moved to the compression coil spring 128.
Hydraulic fluid in the pressurizing chamber 122 according to the urging force of the communication hole 12.
4 and pushed back to the bottom 116 side. When the hydraulic pump 38 stops, the switching valve 70 is switched to connect the supply / discharge oil passage 88 and the discharge oil passage 90, so that the hydraulic oil in the pressurizing chamber 122 can be pushed out.

The tool head 26 includes a support frame 130 integrally fixed to the cylinder housing 110 so as to protrude forward from the hydraulic cylinder 24, and a hydraulic cylinder 2.
4 and a pair of support pins 132 perpendicular to the center line and parallel to each other
A pair of jaws 134 disposed on the support frame 130 so as to be rotatable around, a leaf spring 136 disposed between the pair of jaws 134 and forcing their distal ends to always close. One end of each jaw 134 is rotatably connected around a connection pin 138 to the rear end opposite to the above-mentioned front end of the jaw 134 with the support pin 132 interposed therebetween. A contact member 1 provided with a link 142 and an engagement recess 144 that can abut on each engagement pin 140 of the link 142 from the right side in FIG. 8 and is integrally provided at the tip of the output rod 112 of the hydraulic cylinder 24.
46.

The support frame 130 is connected to the IX-
As is apparent from FIG. 9, which is a cross-sectional view taken along the line IX, a pair of front ends 108a, 108b are disposed on both sides of the front ends 108a, 108b (see FIG. 8) of the outer tube 108 in parallel with each other.
8b at two locations, bolt 148 and nut 150
And are integrally fixed by the fastening. A pair of jaws 1
Reference numeral 34 is provided between the pair of support frames 130, and the support pins 132 are not detachable because C-shaped retaining rings 152 are provided at both ends protruding from the support frame 130. A compression die 154 is attached to the distal ends of the pair of jaws 134 for compressing and integrally connecting a member to be compressed (not shown) such as a pipe joint portion of a water supply / drainage pipe or a pipe joint member. This compression die 154
8 is slid in a direction parallel to the support pins 132, that is, in the direction of the front and back of FIG.
4, the ball 158 is provided so as to be able to be pushed in from the fitting surface 156 of the tip of the jaw 134 with the compression die 154, and is prevented from falling off. One end of the leaf spring 136 is fixed to the lower jaw 134 in FIG. 8 by a countersunk screw 160, and the other end of the leaf spring 136 is brought into contact with the other end, that is, the upper jaw 134. The shape in the unrestrained state is set in advance so as to apply a biasing force so as to separate the rear end portions from each other. The lower jaw 134 is urged clockwise to the lower support pin 132 while being urged. In this embodiment, the support pin 132 corresponds to a support shaft, and the leaf spring 136 corresponds to a biasing unit.

As shown in FIG. 9, the pair of links 142 are formed with a concave portion 162 formed at the rear end of the jaw 134,
In addition, the one end and the other end are inserted into a recess 164 formed on the front side of the contact member 146 with a small gap therebetween. The connection pin 138 includes
With a length in the axial direction substantially equal to the thickness dimension of the jaw 134, the rear end of the jaw 134 and one end of the link 142 can be penetrated in parallel with the support pin 132, and The fixing screw 166 is fixed to the link 142. The engagement pin 140 fixed in parallel with the connection pin 138 at the other end of the link 142 separated from the connection pin 138 has an axial length at both ends closer to both ends than the connection pin 138 at a predetermined engagement depth. A pair of support frames 130
Are respectively engaged in guide grooves 168 provided inside. The guide groove 168 is provided in the hydraulic cylinder 2
4 is formed in a direction parallel to the center line of the
The jaws 134 are reciprocated while being guided by the guide grooves 168 so that the pair of jaws 134
8 and the pair of compression dies 154
Is opened and closed. In the present embodiment, the engaging pin 140 corresponds to an engaging portion.

FIG. 10 is a diagram showing the inner surface of the support frame 130. A pair of guide grooves 168
It has an elongated hole shape having a width slightly larger than the diameter of 40 and the predetermined engagement depth, and is spaced apart from the center line of the hydraulic cylinder 24 by an equal distance in parallel with the center line. They are formed in parallel. The guide groove 168 guides the engagement pin 140 in a direction parallel to the center line of the hydraulic cylinder 24 and a pair of jaws 13.
10 corresponds to a guide means for reciprocally supporting between a front position shown by a dashed line in FIG. 10 when the door 4 is closed and a rear position shown by a two-dot chain line when the pair of jaws 134 are opened. In addition, at the rear end of the support frame 130,
A pair of insertion holes 170 through which the bolts 148 are inserted are provided.

FIG. 11 is a front view of the contact member 146 with a part thereof cut away. A front portion of the contact member 146 has a mountain shape when viewed from the rear, and a valley portion thereof is formed. The engaging recess 144 corresponding to
It has an arc shape with a radius slightly larger than zero. The most protruding central projection 172 is the dimension between the pair of guide grooves 168 of the support frame 130, that is, the guide surface 168 near the center in FIG.
having a width dimension substantially equal to the dimension between ai and 168bi,
A pair of sliding surfaces 174 parallel to the center line of the hydraulic cylinder 24
have. A fitting hole 178 into which the fitting projection 176 of the output rod 112 of the hydraulic cylinder 24 is fitted is provided on the rear side of the contact member 146, and the fitting projection 176 is fitted. The stop bolt 18 which can protrude into the engagement groove 180 formed in the fitting protrusion 176
2 and a lock bolt 184 for locking the stop bolt 182 are screwed from the outer peripheral side.

When the output rod 112 of the hydraulic cylinder 24 is protruded and driven, the engagement recess 144 abuts on the engagement pin 140 to press the pair of jaws 134 in the closing direction. Compression dies 154
While the member to be compressed is compressed between the output rods 1
8, the engagement pin 140 held at the front position by the urging force of the leaf spring 136 causes the engaging pin 140 to be pressed against the urging force of the leaf spring 136. It does not prevent you from moving to the rear position. That is, when the pair of jaws 134 are manually opened and closed, the engagement pins 14 of the pair of links 142
0 allows reciprocating movement between the front position and the rear position, respectively.

Next, the operation of the portable hydraulic compressor 10 configured as described above will be described.

First, in a state where the output rod 112 of the hydraulic cylinder 24 is held at the retracted position without pushing the switch 14, the tool head 26 is supported, for example, by the hand not gripping the grip portion 12, FIG.
As shown in FIG. 7, the rear ends of the pair of jaws 134 are sandwiched between the fingers in the direction of the arrow in the figure, and the distal ends of the pair of jaws 134 are opened against the urging force of the leaf spring 136. At this time,
The posture of the tool head 26 around the central axis of the hydraulic cylinder 24 is changed as necessary according to the arrangement direction of the member to be compressed at the piping site. In this state, the compressor 10 is moved so that the member to be compressed is located between the pair of compression dies 154.
After adjusting the relative position between the pair of jaws 134 and the member to be compressed, the force of the finger that opened the pair of jaws 134 is released, and the leaf spring 136 is released.
The member to be compressed is sandwiched between the compression dies 154 according to the urging force.

When the positional relationship between the compression die 154 and the member to be compressed is correctly determined, the switch 1
4, the electric motor 16 is operated, the hydraulic oil is pumped to the switching valve 70 by the hydraulic pump 38, and the switching valve 70 is moved by the hydraulic oil pressure to the discharge oil passage 56 and the supply / drain oil passage 88. And the communication between the supply / discharge oil passage 88 and the discharge oil passage 90 is interrupted, and as shown in FIG.
The hydraulic oil pumped from the pressure chamber 12 of the hydraulic cylinder 24
Flow into 2. As a result, the output rod 112 of the hydraulic cylinder 24 is protruded and driven, and the engagement concave portion 144 of the contact member 146 comes into contact with the engagement pin 140 of the link 142, and the compression die is connected to the pair of jaws 134 via the connection pin 138. A pressing force in a direction to close 154 is applied.
Thus, the member to be compressed is compressed between the compression dies 154. In a state where the compression die 154 is completely closed and the pushing operation of the switch 14 is continued, the relief valve 94 is increased due to an increase in the hydraulic pressure.
Is opened, and the working oil supplied from the hydraulic pump 38 is returned from the branch oil passage 96 to the inside of the tank 18 via the discharge oil passage 102.

After the compression of the member to be compressed is completed, the switch 1
4 is released, the operation of the electric motor 16 is stopped, and the hydraulic oil is no longer supplied from the hydraulic pump 38 to the switching valve 70, so that the discharge oil passage 90 communicates with the supply / discharge oil passage 88. As a result, the piston 114 of the hydraulic cylinder 24 is pushed back in accordance with the urging force of the compression coil spring 128, and the hydraulic oil in the pressurizing chamber 122 is supplied through the supply / discharge oil passage 88 and the discharge oil passage 90 to the oil storage chamber 5.
8, and then returned into the tank 18. As a result, the output rod 112 and the contact member 146 are returned to the retracted position in FIG. 8, and the movement of the engaging pin 140 to the rear position, that is, the opening operation of the pair of jaws 134 is allowed again. The tool head 26 is separated from the member to be compressed after the compression processing is completed, and the operation is completed. Since the pair of jaws 134 are held in the closed position by the leaf spring 136, the compressor 10 can be separated from the member to be compressed simply by pulling the compressor 10 rightward in FIG.

As described above, according to the portable hydraulic compressor 10 of the present embodiment, prior to the compression working by the hydraulic cylinder 24, the pair of jaws 134 are held by the fingers of one hand supporting the tool head 26. After adjusting the relative positions of the compressor 10 and the member to be compressed with the distal ends of the pair of jaws 134 opened with the other end side interposed therebetween, the force of the hand is released and the urging force of the leaf spring 136 is released. Can be sandwiched between the compression dies 154 according to
It is easy to correctly position the positional relationship between the member 4 and the member to be compressed, so that workability in a narrow place or a place difficult to see is improved, and processing defects due to positioning errors are reduced.

In the hydraulic cylinder 24 of the present embodiment, the outer tube 108 to which the tool head 26 is fixed is rotatably provided with respect to the inner tube 106 fixed to the second housing 22. There is an advantage that operations such as positioning with respect to the member to be compressed become easy.

Further, in this embodiment, a single-acting hydraulic cylinder 24 is used, and a switching valve 70 which is switched according to a supply state of hydraulic oil from a hydraulic pump 38 is employed. While the push rod is released, the output rod 112 is retracted, so that the operation is easier than, for example, switching between the operation stop of the hydraulic pump 38 and the switching of the valve by a switch or the like. In particular, the portable compressor 10 as in this embodiment
In this case, the burden on the worker is greatly reduced and the work efficiency is improved.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, in the above embodiment, a pair of links 1
The engagement pin 140 provided at the other end of the support frame 42 is supported by guide grooves 168 provided in the support frames 130 on both sides so as to be able to reciprocate between a front position and a rear position. The form of engagement of the guide means can be changed as appropriate, and various mechanisms can be used by using a known mechanism such as a slide member rotatably provided at the other end of the link 142 being guided by a guide rail of the support frame 130. Aspects can be configured.

Further, the contact member 146 in the above embodiment is used.
Has a projection 172 having a pair of sliding contact surfaces 174, and has a function of regulating the movement of the engaging pin 140 of the link 142 together with the guide surfaces 168 ai and 168 bi near the center of the guide groove 168. , 172 and one of the guide surfaces 168ai and 168bi may be omitted. The guide groove 168 can be omitted by disposing a substantially E-shaped abutting member having a protruding portion which is also separated from the protruding portion 172 in the vertical direction in FIG.

In the above embodiment, the tool head 26 is rotatable with respect to the hydraulic cylinder 24 by the wire 126 and cannot be pulled out. However, for example, the outer tube 108 is screwed into the inner tube 106 and Sometimes, an engaging pin or the like that engages with each other is provided so that the outer tube 108 can be relatively rotated within a predetermined rotation angle range while preventing the outer tube 108 from rotating and coming out of the inner tube 108 in the reverse direction. Various connecting means for connecting the two so as to be rotatable and unable to come out can be adopted. In the present invention, it is not always necessary to provide such a connecting means, and the inner tube 106 and the outer tube 108 may be connected so that they cannot rotate relative to each other.

In the above embodiment, the leaf spring 136 as the urging means is disposed with one end fixed to one jaw 134 and the other end abutted on the other jaw 134. However, the form of the leaf spring, such as being disposed between the pair of links 142, can be appropriately changed.
Utilizing another spring member such as a tension coil spring disposed between the support frame 130 and the link 142, or a compression coil spring disposed between the link 142 and the contact member 146, or a magnet. The urging means of a different mode may be constituted by using the above.

Also, at the tip of the pair of jaws 134,
It is also possible to provide a notch having a substantially V-shape across both sides and open the jaw 134 just by pressing against the member to be compressed, so that the member to be compressed is sandwiched between the compression dies 154.

In the above embodiment, the single-acting hydraulic cylinder 24 is used in which the output rod 112 is held at the retracted position by the urging force of the compression coil spring 128 when no hydraulic pressure is applied. Alternatively, a double-acting hydraulic cylinder in which the output rod is protruded and retracted by the supply of hydraulic oil may be used.

Although not specifically exemplified, the present invention can be embodied in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a front view of a portable hydraulic compressor according to an embodiment of the present invention.

FIG. 2 is a plan view of the compressor of FIG.

FIG. 3 is a partial longitudinal sectional view showing the vicinity of a hydraulic pump of the compressor of FIG. 2;

4 is a cross-sectional view of a second housing part provided with a hydraulic pump in FIG. 3, and is a view corresponding to a cross section taken along line IV-IV in FIG. 6;

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a sectional view taken along line VI-VI in FIG. 3;

FIG. 7 is a cross-sectional view showing a state in which an oil passage connection state of the switching valve shown in FIG. 6 is switched.

FIG. 8 is a front view partially showing a hydraulic cylinder and a tool head of the compressor of FIG. 1 in a cross section.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a front view showing a part of a support frame in the tool head of FIG. 8;

FIG. 11 is a front view showing a contact member of the tool head of FIG. 8 with a part cut away.

FIG. 12 is a diagram illustrating a state in which the distal ends of a pair of jaws of the tool head of FIG. 8 are manually opened.

FIG. 13 is a diagram illustrating a state in which the tips of a pair of jaws of the tool head of FIG. 8 are closed by driving a hydraulic cylinder.

FIG. 14 is a view showing an example of a conventional portable hydraulic compressor.

15 is a diagram illustrating a state in which the hydraulic pressure of the hydraulic cylinder is released in the conventional example of FIG.

[Explanation of symbols]

 10: portable hydraulic compressor 24: hydraulic cylinder 110: cylinder housing 112: output rod 130: support frame 132: support pin (support shaft) 134: jaw 136: leaf spring (biasing means) 138: connection pin (connection) Shaft) 140: engaging pin (engaging portion) 142: link 146: contact member 154: compression die 168: guide groove (guide means)

Claims (1)

(57) [Scope of request for utility model registration] 1. A hydraulic cylinder for driving an output rod to protrude forward, a support frame integrally fixed to a cylinder housing of the hydraulic cylinder so as to protrude forward from the hydraulic cylinder, and a center of the hydraulic cylinder, respectively. A pair of jaws, each of which is rotatably disposed on the support frame at right angles to a line and has a compression die attached to a distal end thereof; and a pair of jaws in a direction in which the distal ends of the pair of jaws close. A biasing means for constantly biasing the jaws; and a pair of jaws at the other end opposite to the distal end with the support shaft interposed therebetween so as to be relatively rotatable around a connection shaft parallel to the support shaft. A pair of links that are connected to each other and that open and close the pair of jaws by being reciprocally moved in a direction parallel to the center line by an engagement portion provided at a position separated from the connection shaft; Guiding means for guiding the engaging portion in a direction parallel to the center line and supporting the engaging portion so as to be able to reciprocate between a front position in which the pair of jaws close and a rear position in which the pair of jaws open; The output rod is provided integrally with the output rod, and when the output rod is driven to protrude, is brought into contact with the engaging portion to press the pair of jaws in the closing direction, while the output rod is held at the retracted position. A portable hydraulic compressor having a contact member that allows the engaging portion to reciprocate between the front position and the rear position when the engagement portion is in the ON state.