JP3591371B2 - Hydraulic tools - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a hydraulic tool such as a crimping tool having a hydraulic pump and used for caulking a crimp terminal to an electric wire.
[0002]
[Prior art]
In a conventional hydraulic tool of this type, a power switch handle for moving a power source of a main body, for example, turning a motor on and off, and a release button for releasing oil after work is independently operated.
[0003]
[Problems to be solved by the invention]
However, since there is no lock mechanism for the power switch handle, the power switch may be inadvertently turned on when holding the tool body, causing the tip cylinder to start moving, or the power switch may be turned on when the release button is operated (release operation). Yes, the hydraulic tool with an output of about 10 tons did not have a main body structure in consideration of safety.
[0004]
Therefore, an object of the present invention is to provide a hydraulic tool in consideration of safety.
[0005]
[Means for Solving the Problems]
The hydraulic tool according to claim 1, wherein the hydraulic tool includes a motor, a hydraulic pump driven by the motor, an output cylinder device having an output piston connected to the hydraulic pump and driven to advance, and connected to the output piston to advance. A hydraulic tool including a driven work part, a tool main body that holds these, and a grip portion provided on the tool main body for gripping the tool main body,
A release valve provided in a cylinder chamber of the output cylinder device for discharging pressurized fluid in the cylinder chamber; a release button provided on the tool body to operate the release valve; and operable connected to the motor Power switch provided with a simple switch handle,
The switch handle is provided on a front side of the grip portion, and the release button is a slide button provided adjacent to the switch handle so as to be slidable in a width direction of a base portion of the grip portion,
The release button has an initial position that is a release valve inoperative position,Becomes the release valve inoperative positionON operation non-restricted position of the switch handle and,Release valve operating positionWhenCan be moved to three positions,
And, when the release button is in the initial position and the release valve operating position, the operation of moving the switch handle to the ON position is prevented.And the moving operation is allowed when in the on-operation non-restricted position.This is provided with an operation restricting section.
[0006]
According to the hydraulic tool of the first aspect, the switch handle of the power switch and the release button are arranged adjacent to each other, and the release button is provided with an operation restricting portion for preventing the operation of the switch handle, so that it is difficult to hold the tool body when holding the tool body. The danger that the power switch is easily turned on can be prevented and safety can be improved.In addition, the switch handle cannot be operated when the release button is operated, and the pump does not operate during the release operation, so it is possible to prevent pump damage due to misuse and to provide a tool body that emphasizes safety. it can.
[0011]
Claim 2The described hydraulic tools areClaim 1AtThe switch handleA switch case of the power switch, which is provided to be able to advance and retreat.The switch handle andPosition the operation restricting part of the release button betweenThe switch handleThe operation of is prevented.
[0012]
Claim 2According to the hydraulic tool described above, the same effect as that of the first aspect is obtained.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of the present invention will be described with reference to FIGS. That is, this hydraulic tool is a crimping tool used for caulking a crimp terminal to an end of an electric wire.
[0016]
As shown in FIG. 1, the hydraulic tool includes a motor 130, a hydraulic pump 140 driven by the motor 130, an output cylinder device 3 having an output piston 51 connected to the hydraulic pump 140 and driven to advance. And a crimping die 120 which is a work part connected to the output piston 51 and driven to advance. These are coaxially arranged on the body 151 of the tool main body 150 as shown in FIG. 1, and the grip 152 protrudes from the body 151.
[0017]
The output cylinder device 3 includes an oil tank 100 connected to the cylinder chamber 50, a release valve 70 (see FIG. 10) provided in the cylinder chamber 50 of the output cylinder device 3 for discharging pressurized fluid in the cylinder chamber 50, and a tool. A release button 153 is provided near the grip 152 protruding from the body 151 of the main body 150 and operates the release valve 70. The oil tank 100 and the release valve 70 are arranged on the upper part of the body 151 on the opposite side of the grip 152 and the release valve 70Operation piece 77And the release button 153 are connected via a lever 155. The lever 155 is pivotally supported so that the distance between the rotation fulcrum and the operation piece 77 that is the operation part of the release valve 70 is smaller than the distance between the rotation fulcrum and the release button 153. ing. The lever 155 of the embodiment has a substantially inverted L-shape as shown in FIG. 2 and a support shaft 155c is provided at a substantially intermediate portion thereof. The lever 155 is disposed on the outer periphery of the hydraulic pump 140 near the cylinder chamber 50, and the support shaft 155c is provided. Are supported in a bearing hole formed in the wall of the cylinder chamber 50.
[0018]
On the other hand, a power switch 157 provided with a switch handle 156 operable by being connected to the motor 130 is housed in the grip portion 152, and a release button 153 is disposed on the hydraulic pump 140 side above the switch handle 156.
[0019]
As described above, the release button 153 is disposed adjacent to the switch handle 156, and the release button 153 is provided with the operation restricting portion 158 for preventing the operation of the switch handle 156. When the release button 153 is in the release valve operating position, the switch handle 156 is turned off. The second operation restricting portion 159 for preventing the operation of moving the switch handle 156 to the ON position when the release button 153 is at the initial position where the release valve is not operated, while preventing the operation of moving the switch handle 156 to the ON position. Is provided on the release button 153. The release button 153 is a slide button, and is a lock piece of the release button 153 between the switch case of the power switch 157 and the trigger handle, which is provided with a trigger handle as the switch handle 156 so as to be able to move forward and backward. , 159 to prevent operation of the trigger handle. In this manner, the release button 153 is moved to three positions: the initial position, which is the ON operation restriction position of the trigger handle, the ON operation non-restriction position of the trigger handle, and the release valve operating position, which is the ON operation restriction position of the trigger handle. It is free.
[0020]
FIG. 2 is a view of the release button 153, lever 155, and switch handle 156 taken along the line AA in FIG. 1, and the release button 153 is positioned just between the switch handle 156 of the power switch 157 and the hydraulic pump 140. It is slidably disposed through the base of the grip 152. The release button 153 is in the shape of a band plate, and the operation restricting portion 158 and the second operation restricting portion 159 are arranged side by side on the surface facing the switch handle 156 at intervals slightly wider than the width of the switch handle 156. The release button 153 is slid so that it can be positioned on the neck 156a of the switch handle 156 at a position between the switch handle 156 and the switch case. Further, on the surface on the opposite side of the release button 153, there is provided a projection 160 which can push the end of the lever 155 by sliding the release button 153. The release of the release button 153 from the tool body 150 is also used by the operation restricting portions 158 and 159.
[0021]
FIG. 3 shows the relationship between the release button 153 and the power switch 157 as viewed from the line BB in FIG. 2. A positioning piece 161 is provided on the side surface of the release button 153, and a chevron-shaped recess 162 and a projection are formed on the surface of the positioning piece 161. A portion 163 is formed. A spring positioning portion 165 is provided at a portion of the tool body 150 facing the positioning piece 161 to position both ends of the click spring 166 formed by a substantially U-shaped leaf spring. To be elastically engageable. The spring positioning portion 165 has a receiving recess 165a for receiving one end of the click spring 166 formed at one end of a support surface 165b for supporting the click spring 166, and a stopper (not shown) provided at the other end to prevent the click.
[0022]
Regarding the operation of the release button 153 and the switch handle 156, each of FIGS. 2 and 3 shows the locked state of the switch handle 156 and the initial position of the release button 153. At this time, the protrusion 167 of the click spring 166 engages with the recess 162 of the release button 153 to position the release button 153, and at the same time, the protrusion 167 separates from the rear end 155a of the lever 155, and the operation restricting part 158 is connected to the switch handle. 156 is located at the neck 156a. Therefore, the ON operation of the switch handle 156 is restricted, and the power switch 157 cannot be turned on.
[0023]
Each of FIGS. 2 and 3 (b) is in a switch-on state, and is a position where a steering wheel is not turned on. At this time, the release button 153 is slid one step, and the click spring 166 gets over the convex portion 163 to give a click feeling. At the same time, the operation restricting portion 158 is separated from the neck portion 156a of the switch handle 156, so that the switch handle 156 is turned on. The release button 153 is positioned on the slope of the projection 163, with the projection 167 hitting the lever 155 and being pressed against the lever 155.
[0024]
Each of FIGS. 2 and 3 (c) is at the time of release and is a release valve operating position of the release button 153. At this time, the release button 153 is further slid one step in the same direction as above, and the second operation restricting portion 159 enters the neck portion 156a of the switch handle 156, so that the switch is locked, and at the same time, the lever 155 is pushed by the projection 167. The lever 155 rotates about the support shaft 155c, and the tip 155b of the lever 155 pushes the operating piece 77, which is the operating portion of the release valve 70, against the spring force of an internal spring 76, which will be described later. Operate and release. When the release button 153 is released, the lever 155 and the release button 153 return by the restoring force of the internal spring 76 of the release valve 70, and return to the position where the power switch 157 can be turned on, ie, FIG.
[0025]
Note that a battery pack 160 may be provided at the end of the grip portion 152 to serve as a drive source for the motor 130.
[0026]
As shown in FIG. 4, the crimping device main body has a crimping die 120 mounted on the tip of a tool main body 150. A concave mold 21 is provided at the opening / closing portion 123 of the crimping die 120, and a convex mold 122 as a work portion is provided at a tip of the output piston 51 of the output cylinder device 3. And the convex mold 122 are opened.
[0027]
The crimping of the crimp terminal is performed as follows. That is, the opening / closing portion 123 is opened and closed, and an electric wire (not shown) and a crimp terminal (not shown) are inserted between the concave mold 121 and the convex mold 122 of the crimping die. The crimp terminal is caulked to the electric wire by approaching the operation of the output piston 51.
[0028]
As described above, the body 130 of the tool body 150 houses the motor 130, the hydraulic pump 140 driven by the motor 130, and the output cylinder device 3 connected to the hydraulic pump 140. The hydraulic pump 140 and the output cylinder device 3 constitute a power device for a crimping tool. Power is supplied to the motor 130 from a power source such as a battery pack 160 mounted on the grip 152 of the tool body 150 or a commercial AC power source.
[0029]
As shown in FIG. 4, the hydraulic pump 140 is an axial rotation type, has an axial fluid pressure pump unit having an automatic variable type swash plate, and has an automatic flow rate adjusting mechanism, and the swash plate device 1 and the cylinder device 2 are combined. Have. The swash plate device 1 is attached to one end opening of a cylindrical oil chamber 4 that fills a fluid such as oil, and the cylinder device 2 is attached to a small-diameter opening at the other end of the cylindrical oil chamber 4. Is filled with oil.
[0030]
The swash plate device 1 has a rotating shaft 5 serving as a power transmission shaft driven by a motor 130, a supporting shaft 6 having an axial direction different from that of the rotating shaft 5, and a sliding face 7 a of the rotating shaft 5. A swash plate 7 rotatably provided around the support shaft 6 so as to be inclined with respect to the direction, and a swash plate restoring means for restoring the swash plate 7 to an inclined posture, for example, a spring for urging the swash plate 7 to the inclined posture. 8 In the embodiment, the base end 17 of the rotating shaft 5 is attached to the center of the motor mount 9 via a bearing 15 serving as a bearing, and the distal end 5a of the rotating shaft 5 is connected to the center of the cylinder device 2 via a bearing 16 serving as a bearing. Is attached to the concave portion provided in. The motor 130 is mounted on the motor mount 9, and the drive shaft of the motor 130 is connected to the base end 17 of the rotating shaft 5. The motor mount 9 is in contact with an opening edge of one end of the oil chamber 4 and is fixed together with a motor 130 to a screw hole 18 provided in the opening edge by a bolt (not shown). The cylinder device 2 has a screw 19 formed on the outer periphery, is screwed and attached to a female screw formed on the inner peripheral surface at the other end of the oil chamber 4, and has an O-ring 20 in a circumferential groove formed on the peripheral surface of the cylinder device 2. It is attached to the inner periphery of the oil chamber 4 in a liquid-tight manner. The motor mount 9 has a projection 11 fitted into the opening of the oil chamber 4, a peripheral groove is formed on the peripheral surface of the projection 11, and an O-ring 21 is mounted in the peripheral groove. Is liquid-tightly adhered to the inner peripheral surface. Reference numeral 22 denotes an oil seal provided on the projection 11.
[0031]
The rotary shaft 5 is provided with a flange 24 at a position in the oil chamber 4, a long stopper 25 using a pin, for example, is provided on one side of the flange 24 with respect to the rotary shaft 5, and a short stopper using a pin is provided on the other side. A stopper 26 is provided upright. The support shaft 6 is provided at right angles to the rotary shaft 5 in the oil chamber 4 by, for example, a fulcrum pin. The swash plate 7 is attached to both ends of the support shaft 6 and has a through hole 7b at the center through which the rotary shaft 5 is inserted, and is rotatable between a pair of stoppers 25 and 26. The rotation range is, for example, about 1.5 to 10 degrees with respect to a direction perpendicular to the rotation axis 5. The spring 8 uses, for example, a plurality of coil springs, and is compressed and interposed between the flange 24 and the swash plate 7 on the long stopper 25 side, inclining the swash plate 7 in a direction away from the flange 24, and as shown in FIG. It is locked to a short stopper 26. The spring 8 can be a leaf spring or a combination thereof in addition to a coil spring.
[0032]
The cylinder device 2 has a cylinder 30 disposed opposite to the sliding surface 7 a of the swash plate 7, and has a plurality of cylinder recesses 33 which are substantially parallel to the rotating shaft 5 and open toward the swash plate 7. The cylinder recess 33 has a discharge portion 35 at the bottom thereof which can be discharged from the cylinder recess 33 through a first check valve 34. The discharge portion 35 is inserted into each opening of the cylinder recess 33 so as to be able to advance and retreat, and the tip is provided. The swash plate 7 is provided with a piston portion 37 that moves forward and backward in accordance with the rotation of the swash plate 7, and suction means for sucking fluid into the bottom of the cylinder recess 33 by the advance operation of the piston portion 37. Have.
[0033]
In the embodiment, the cylinder 30 of the cylinder device 2 is attached to the other end of the oil chamber 4. As shown in FIG. 11, five cylinder recesses 33 are arranged around the center at equal intervals in the circumferential direction, and a discharge portion 35 having a first check valve 34 is provided at the bottom via a small-diameter communication passage 44. Have been. The piston 37 has a distal end slidably in contact with the sliding surface 7a of the swash plate 7 and is urged by a spring 36. A spring receiving portion 46 using a ring is provided at the distal end, and the piston 37 is provided on the piston 37. One end of a spring 36 using, for example, a coiled spring is engaged with the spring receiving portion 46, and the other end is engaged with the front end engaging concave portion of the cylinder concave portion 33 of the cylinder 30, thereby urging the piston portion 37 to project. The partial spherical surface at the tip of the piston portion 37 is in contact with the sliding surface 7a of the swash plate 7. Thus, when the swash plate 7 rotates together with the rotation of the rotary shaft 5, the piston portion 37 repeats one reciprocating stroke with one rotation of the swash plate 7.
[0034]
The suction means is provided with a suction port 39 at the front end of the piston portion 37 and a discharge port 40 at the rear end side of the piston portion 37 as shown in an enlarged view in FIG. A second check valve 42 operable to perform a discharge operation is provided in the passage 41. The second check valve 42 includes a ball valve 42a, a spring 42b that presses the ball valve 42a, and a screw portion 42c that supports the spring 42b. The screw portion 42 c is screwed into a female screw formed in the discharge port 40, and the valve, for example, the ball valve 42 a contacts the valve seat 41 b at the end of the small-diameter portion 41 a on the suction port 39 side of the passage 41. When the screwing amount of the screw portion 42c is adjusted, the force with which the ball valve 42a presses the valve seat 41b is adjusted. The suction port 39 is located in the oil chamber 4 during the suction operation in which the cylinder recess 33 advances toward the swash plate 7 from the cylinder recess 33. Therefore, when the piston portion 37 advances, the volume of the cylinder recess 33 increases. As a result, the ball valve 42a of the second check valve 42 is opened from the valve seat 41b, and the oil in the oil chamber 4 is sucked into the cylinder recess 33 from the suction port 39 (FIG. 7B). On the other hand, at the time of the retreat operation of the piston portion 37, the volume of the cylinder concave portion 33 becomes small, and the oil in the cylinder concave portion 33 is pressurized. However, the second check valve 42 is pressed in the direction in which the ball valve 42a is closed by the valve seat 41b. The valve remains closed without opening (FIG. 7A), and the pressurized oil is discharged to the discharge unit 35 as described later.
[0035]
The output cylinder device 3 has a cylinder chamber 50 serving as a discharge chamber of the cylinder device 2 connected to the discharge section 35, and has an output piston 51 inserted into the cylinder chamber 50. The output piston 51 includes a contact portion 55 that slides on the inner peripheral surface of the cylinder chamber 50 and a driving piece 56 provided at the center of the contact portion 55. An O-ring 57 is provided in a circumferential groove on the outer peripheral surface of the contact portion 55, and is in fluid-tight contact with the inner peripheral surface of the cylinder chamber 50. The output piston 51 is urged by a spring 90 in a direction to reduce the internal volume of the cylinder chamber 50. The spring 90 of the embodiment is a coil spring. The coil spring is passed through the driving piece 56, and one end is locked to the contact portion 55, and the other end is locked to the crimping die 120 side attached to the cylinder chamber 50. , The output piston 51 is biased toward the cylinder device 2 side.
[0036]
The end of the oil chamber 4 on the side of the cylinder device 2 is attached to the bottom wall 50a of the cylinder chamber 50. The discharge unit 35 is configured to extend over the cylinder device 2 and the output cylinder device 3, and an end of the discharge unit 35 communicates with the cylinder chamber 50. The first check valve 34 includes a spring supported at one end of the discharge portion 35 and a valve, for example, a ball valve supported at the tip of the spring and abutting against a valve seat at the boundary between the discharge portion 35 and the communication passage 44. . Therefore, when the cylinder concave portion 33 of the cylinder device 2 is compressed by the piston portion 37, the pressure of the communication portion 44 increases, the ball valve is pushed from the valve seat and the valve is opened, and the oil of the cylinder concave portion 33 passes through the discharge portion 35. The oil flows into the cylinder chamber 50, and the oil accumulates in the cylinder chamber 50. As described above, since the output piston 51 of the output cylinder device 3 is provided with the spring 90 in the direction of compressing the cylinder chamber 50, the output piston 51 is normally in a state of being retracted into the cylinder chamber 50. Is pushed by the oil pressure due to the reciprocating operation of the piston portion 37, and the output piston 51 advances outward against the spring 90. On the other hand, the reverse flow of the oil is prevented because the ball valve of the first check valve 34 is pressed against the valve seat by the oil and comes into close contact therewith.
[0037]
As described above, the swash plate 7, the piston portion 37, and the cylinder 30 are disposed in the oil chamber 4, the oil chamber 4 is connected to the oil tank 100, and the cylinder chamber 50 is connected to the oil through the release valve 70 and the pressure reducing valve 60. It is connected to the tank 100.
[0038]
As shown in FIGS. 5 and 9, a pressure reducing valve 60 is provided in the bottom wall 50 a of the cylinder chamber 50. This pressure reducing valve 60 is inserted into the bottomed hole 61, a small-diameter communication passage 62 communicating with the inside of the cylinder chamber 50 at the bottom of the bottomed hole 61. A valve body 63 of a third check valve having a conical portion for closing the outlet of the communication passage 62, a spring 64 for pressing the valve body 63 toward a valve seat, and a female screw formed on the opening side of the bottomed hole 61 And a pressure adjusting unit 65 that supports a spring by providing a screw that is screwed into the spring. The spring pressure of the spring 64 is changed in accordance with the screwing amount of the pressure adjusting section 65 to adjust the pressure for pressing the valve body 63 against the valve seat, so that the oil pressure in the communication passage 62 communicating with the cylinder chamber 50 becomes equal to the oil pressure. The position, that is, the pressure at which the valve body 63 is pushed by the oil pressure to open and decompress the cylinder chamber 50 is adjusted. The pressure adjusting section 65 is provided with an O-ring 66 in an outer circumferential groove to prevent oil leakage. 67 is an outlet formed on the side of the bottomed hole 61.
[0039]
As shown in FIGS. 6 and 10, a release valve 70 is provided on the bottom wall 50 a of the cylinder chamber 50. The release valve 70 includes a valve chamber 72 of a fourth check valve that communicates with the cylinder chamber 50 at a communication portion 71, and an operation chamber 74 that communicates with an end of the valve chamber 72 through a small-diameter communication passage 73. In the valve chamber 72, a valve closing a communication passage 73 communicating with the operation chamber 74, for example, a ball valve 75 is pressed by a spring 76. The operation chamber 74 is opened on the outer surface of the bottom wall 50a, the end of the operation piece 77 protrudes from this opening, and is urged so as to protrude to the outside by a spring 78. A pressing piece 79 capable of pressing the ball valve 75 is provided. Reference numeral 80 denotes an oil outlet formed on the side of the operation chamber 74. When the output piston 51 of the cylinder device 3 is to be retracted, the operating piece 77 is pushed and the ball piece 75 is pushed open by the pushing piece 79 against the spring 76 so that the oil in the cylinder chamber 50 is released by the pressure to the communication passage 73. Then, the oil flows through the operation chamber 74 to the outside of the cylinder chamber from the oil outlet 80.
[0040]
As shown in FIG. 4 again, the oil tank 100 adjacent to the oil chamber 4 is attached to the bottom wall 50a of the cylinder chamber 50, and a communication path 101 for communicating the oil tank 100 and the oil 4 chamber is formed in the bottom wall 50a. A filter 103 is mounted at the outlet on the oil tank 100 side. The outlet 67 of the bottomed hole 61 of the pressure reducing valve 60 and the oil outlet 80 of the operation chamber 74 of the release valve 70 are connected to the oil tank 100. The oil tank 100 is formed of a flexible member.
[0041]
The operation of the crimp terminal crimping device will be described. 4 and 8 show the operation at the time of pressurization for terminal crimping, in which the output piston 51 of the output cylinder device 3 is retracted by the spring 90, and the cylinder chamber 50 is in the minimum space. The oil pressure in the chamber 50 is also at a minimum. At this time, the swash plate 7 is pressed against the short stopper 26 by the spring 8 of the swash plate 7. When the motor 130 rotates, the rotating shaft 5 and the swash plate 7 rotate, the piston portion 37 slides on the sliding surface 7a, and the piston portion 37 reciprocates in the axial direction. In this reciprocating operation, when the piston portion 37 advances toward the swash plate 71 by the spring 36 from the cylinder concave portion 33, the internal volume of the cylinder concave portion 33 increases, so that oil is sucked into the cylinder concave portion 33 from the suction port 39, Further, when the piston portion 37 is retracted into the cylinder recess 33 by the swash plate 7, the internal volume in the cylinder recess 33 is compressed. At the time of this compression, the second check valve 42 does not flow backward to the suction port 39 side in the piston portion 37, but pushes the first check valve 34 of the discharge portion 35 open to pump oil into the cylinder chamber 50. I do. The piston portion 37 makes one reciprocation with one rotation of the swash plate 7, but since the inclination angle of the swash plate 7 is the maximum at this time, the reciprocation stroke of the piston portion 37 is also maximum, and therefore the oil pressure per one reciprocation is sent. The amount is also maximum. In the cylinder chamber 50 in the output cylinder device 3 in which the oil is pumped from the piston portion 37, the internal pressure of the cylinder chamber 50 is sequentially increased by the oil, and the output piston 51 advances. Therefore, the convex mold 122 of the crimping die 120 moves closer to the concave mold 121.
[0042]
FIGS. 5 and 9 show the operation from pressurizing operation for terminal crimping to pressure reducing valve operation for keeping the maximum pressure from completion of caulking constant. When the convex mold 122 starts to press and crimp the crimp terminal, a load is applied to the output piston 51. And pressurizes the oil with the load to press the first check valve 34 of the discharge unit 35. For this reason, a load is applied to the discharge operation of the piston portion 37 that generates the hydraulic pressure that pushes the first check valve 34 open, and a load is applied to the spring 8 of the swash plate 7 that pushes the piston portion 37, and the spring 8 is elastically deformed. Will be done. As a result, when the oil pressure exceeds the spring force of the spring 8 in the cylinder chamber 50, the spring 8 is compressed and deformed accordingly, and the inclination angle of the swash plate 7 approaches the direction perpendicular to the rotating shaft 5, and the spring 8 It will have a tilt angle with balanced pressure. Further, since the piston load is applied at the time of discharge, the piston portion 37 is pushed when the swash plate 7 is rotated and is applied to the swash plate 7 so that the spring 8 is incorporated at that position, which is efficient. When the angle of the swash plate 7 with respect to the piston portion 37 is reduced, the reciprocating stroke of the piston portion 37 is reduced, and the load on the motor 130 is also reduced. When the maximum load is applied, the swash plate 7 is locked by the long stopper 25, but also at this time, the swash plate 7 has an inclination (for example, about 1.5 °) for reciprocating the piston portion 37. In this case, the pressure in the cylinder chamber 50 is kept constant by the operation of the pressure reducing valve 60. The operation of the pressure reducing valve 60 is adjusted by the pressure adjusting unit 65, and is set to the maximum pressure for caulking the crimp terminal. Therefore, although the crimping terminal is securely caulked, the pressure reducing valve 60 is opened for a certain pressure of oil or more, so that no excessive caulking force is applied to the crimping terminal. The swash plate 7 may be inclined so that the piston portion 37 does not reciprocate when the load is the maximum.
[0043]
6 and 10 show a release operation. When the operation piece 77 is pressed, the release valve 70 is pressed and opened, and the oil in the cylinder chamber 50 flows out of the cylinder chamber 50 to reduce the pressure. Due to the decrease in the pressure, the spring 90 of the output piston 51 returns and pushes the output piston 51 back, so that the oil is pushed out and no load is applied to the spring 8 of the swash plate 7, so that the swash plate 7 returns to the maximum angle. The inclined and short stopper 26 is engaged.
[0044]
When the motor 130 is kept operating, the output piston 51 reciprocates in this step, so that the crimp terminal can be continuously caulked. However, the motor 130 is stopped every time the output piston 51 retreats. You may let it.
[0045]
The circulation of oil will be described. The oil is filled in the oil chamber 4 and the oil tank 100, and communicates with each other through the communication passage 101 and the filter 103. The oil tank 100 has a capacity of, for example, about 55 cc and is a flexible tank as described above. When the oil is sucked into the cylinder recess 33 by the discharge operation of the piston portion 37 in the oil chamber 4, the oil sequentially flows from the oil tank 100 into the oil chamber 4 through the filter 103 and the communication passage 101, and the oil tank 100 becomes flexible. As shown in FIG. 5 and FIG. The oil sucked into the cylinder recess 33 is sequentially sent to the cylinder chamber 50 in the output cylinder device 3 under pressure, and the volume of the cylinder chamber 50 is expanded by the movement of the piston 51. The oil in the cylinder chamber 50 is returned to the oil tank 100 by opening the pressure reducing valve 60 at the time of pressure reduction, and is returned to the oil tank 100 by opening the release valve 70 at the time of release. Thus, the oil circulates.
[0046]
In the present invention, the fluid may be other than oil.
[0047]
In the embodiment, the crimping tool has been described as an example. However, a hydraulic tool such as a wire or bolt cutting device may be used.
[0048]
【The invention's effect】
According to the hydraulic tool of the first aspect, the switch handle of the power switch and the release button are disposed adjacent to each other, and the release button is provided with an operation restricting portion for preventing the operation of the switch handle, so that it is difficult to hold the tool body when holding the tool body. The danger that the power switch is easily turned on can be prevented and safety can be improved.In addition, the switch handle cannot be operated when the release button is operated, and the pump does not operate during the release operation, so it is possible to prevent pump damage due to misuse and to provide a tool body that emphasizes safety. it can.
[0051]
Claim 2According to the hydraulic tool described above, the same effect as that of the first aspect is obtained.
[Brief description of the drawings]
FIG. 1 is a side view showing a state where a tool main body according to an embodiment of the present invention is divided into two parts.
FIG. 2 is an explanatory diagram showing a relationship between a switch handle, a release button, a lever, and the like, as viewed from a line AA of FIG.
FIG. 3 is a diagram illustrating the operation of a release button and a switch handle, as viewed from the line BB in FIG. 2;
FIG. 4 is a partial cross-sectional view showing an operation state when the hydraulic tool is pressurized.
FIG. 5 is a partial cross-sectional view illustrating a state during a pressurizing operation and a state during a pressure reducing valve operation.
FIG. 6 is a partial cross-sectional view of a state during a release operation.
FIGS. 7A and 7B are enlarged cross-sectional views showing a check valve of a piston portion, wherein FIG. 7A shows a state where the check valve is closed, and FIG. 7B shows a state where the check valve is open.
FIG. 8 is an enlarged partial cross-sectional view of a main part explaining the operation of the swash plate.
FIG. 9 is an enlarged partial cross-sectional view of main parts during the pressurizing operation and the pressure reducing valve operation.
FIG. 10 is an enlarged partial cross-sectional view of a main part in a state during a release operation.
FIG. 11 is an explanatory view of the cylinder device as viewed in the axial direction.
[Explanation of symbols]
3 Output cylinder device
4 Oil chamber
5 Rotation axis
6 Support shaft
7 Swash plate
8 Spring
50 cylinder chamber
51 output piston
60 pressure reducing valve
70 Release valve
77 Operating piece of release valve
90 spring
100 oil tank
120 crimping dies
130 motor
140 hydraulic pump
150 Tool body
151 torso
152 grip
153 release button
155 lever
155c spindle
156 switch handle
157 Power switch
158 Operation regulation section
159 second operation restricting unit

Claims (2)

A motor, a hydraulic pump driven by the motor, an output cylinder device having an output piston connected to the hydraulic pump and driven to advance, a work portion connected to the output piston and driven to advance, A hydraulic tool having a tool body to be held and a grip portion provided on the tool body for gripping the tool body,
A release valve provided in a cylinder chamber of the output cylinder device for discharging pressurized fluid in the cylinder chamber; a release button provided on the tool body to operate the release valve; and operable connected to the motor Power switch provided with a simple switch handle,
The switch handle is provided on a front side of the grip portion, and the release button is a slide button provided adjacent to the switch handle so as to be slidable in a width direction of a base portion of the grip portion,
The release button has an initial position where the release valve unactuated position, and on the operation non-restricting position of the switch handle to be the release valve inoperative position, is movable to three positions of the release valve actuated position,
The release button prevents the switch handle from moving to the ON position when the release button is at the initial position and the release valve operating position, and allows the movement operation when the switch handle is at the ON operation non-restricted position. Hydraulic tool with a regulation part. Hydraulic according to claim 1, wherein blocking the said operation restricting portions of the release button by the position of the switch handle operation between the switch case of the power switch is provided to be movable forward and backward the switch handle and the switch handle tool.

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