Punch tool

Abstract

To provide a punch tool with excellent workability when forming a hole in a part to be worked such as a housing and a panel.SOLUTION: A punch tool 1 includes a body 2 that grips and pulls a bolt 17 in a state where a punch 19 is connected to the bolt inserted through a die 18 and a part to be worked 30. The body 2 has a cylinder part 3, a connection part 4 connected to the cylinder part 3, a hydraulic pump 5 that supplies hydraulic oil 5b to the cylinder part 3 via the connection part 4, and an electric motor 6 that drives the hydraulic pump 5. The cylinder part 3 has a plurality of claw parts 7, a piston 8 that reciprocates while surrounding the claw parts 7, a receiving part 9 through which the bolt 17 is inserted and which is in contact with the die 18, a first spring 11 that pushes the piston 8 such that the piston 8 moves toward the die 18, and a second spring 12 that pushes the claw parts 7 such that the claw parts 7 come into contact with the piston 8. The punch tool is configured such that the piston 8 grips and pulls the bolt 17 by advancing while narrowing the interval between the claw parts 7 in a circumferential direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a punch tool for punching a hole in a workpiece. [Background technology]

[0002] Conventionally, punch tools for drilling holes in workpieces such as housings and panels have been known (Patent Document 1: Japanese Utility Model Application Publication No. 6-15822, Patent Document 2: Japanese Patent Application Publication No. 7-80566, Patent Document 3: US Patent Application Publication No. 2022 / 0032486). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 6-15822 [Patent Document 2] Japanese Patent Application Publication No. 7-80566 [Patent Document 3] US Patent Application Publication No. 2022 / 0032486 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, a worker would thread a bolt onto a punch tool and insert the bolt into a die. Then, the worker would hold the punch tool, align the bolt threaded onto the tip of the tool with a pilot hole in a workpiece, insert the bolt into the pilot hole, and screw the punch into it. Because punch tools weigh several kilograms, the setting work places a significant burden on the worker. Furthermore, when drilling a hole in a housing such as a chassis, the bolt may need to be aligned with the pilot hole from inside the housing. However, it is difficult for the worker holding the punch tool to visually confirm the exact position of the pilot hole. In other words, the setting work of aligning the bolt threaded onto the tip of the punch tool with the pilot hole in the workpiece, inserting the bolt into the pilot hole, and screwing the punch into it is more difficult than simply inserting a bolt into the pilot hole. Therefore, the setting work still requires a high level of skill from the worker. [Means for solving the problem]

[0005] The present invention has been made in view of the above circumstances, and has as its object to provide a punch tool that is excellent in workability when punching holes in a workpiece such as a housing or a panel.

[0006] In one embodiment, the above problem is solved by the solution disclosed below.

[0007] The punch tool of the present invention comprises a main body that grasps and pulls a bolt inserted through a die and a workpiece and connected to a punch, the main body having a cylinder section, a connecting section that connects to the cylinder section, and a hydraulic pump that delivers hydraulic oil to the cylinder section via the connecting section, the cylinder section having a plurality of claws, a piston that reciprocates around the claws, a receiving section through which the bolt is inserted and that contacts the die, a first spring that pushes the piston so that the piston approaches the die, and a second spring that pushes the claws so that the claws contact the piston, the piston moving forward while narrowing the circumferential spacing between the claws, thereby grasping and pulling the bolt.

[0008] According to this configuration, the bolt can be inserted into the die and then held by hand to align it with the pilot hole in the workpiece, which dramatically improves workability.

[0009] For example, the first end of the piston has a tapered surface whose inner diameter decreases toward the tip, and the claws have inclined surfaces that match the tapered surface and are in slidable contact with the tapered surface. With this configuration, the circumferential spacing between the claws can be smoothly narrowed in conjunction with the forward movement of the piston.

[0010] As an example, the cylinder portion has a first member that contacts the first spring and the piston, and a second member that contacts the second spring and the claw portion, and the piston presses the first member, causing the claw portion to grip the bolt, and the first member and the second member compress the second spring, causing the claw portion to release the bolt. With this configuration, the first spring can be smoothly compressed in conjunction with the forward movement of the piston. Also, the second spring can be smoothly compressed in conjunction with the backward movement of the piston.

[0011] As an example, the receiving portion has a base portion with which the piston moves toward and away from it and a protruding portion with which the claw portion moves toward and away from it, and when the piston moves away from the base portion and presses the claw portion, the claw portion grips the bolt, and when the piston moves toward the base portion and the protruding portion presses the claw portion, the claw portion moves away from the bolt. With this configuration, the circumferential spacing between the claw portions can be smoothly increased in conjunction with the returning movement of the piston.

[0012] As an example, the main body has an electric motor that drives the hydraulic pump, a battery pack that supplies power to the electric motor, a mounting part to detachably mount the battery pack, and a handle part with a switch, the battery pack, the mounting part, and the handle part being arranged in this order along a second axis passing through the drive shaft of the electric motor. With this configuration, the punch tool can be applied even in a complicated work area, such as when drilling additional holes in a workpiece in an electrical panel, a control panel, etc.

[0013] As an example, the connecting portion has a first connecting portion that connects to the cylinder portion perpendicular to a first axis passing through the piston, and a second connecting portion that connects to the main body on the second axis, and the first connecting portion and the second connecting portion are rotatably connected to each other. With this configuration, the positions of the main body and the cylinder portion are variable, and the relative angle between the main body and the cylinder portion can be adjusted to a desired angle in accordance with the position and direction of the bolt. This further improves workability.

[0014] For example, the bolt has a male screw portion that screws into the punch, a stepped portion that limits the movable range of the die, and a constricted portion that engages with the claw portion. This configuration allows for a simple and versatile configuration. [Effects of the Invention]

[0015] According to the present invention, a punch tool can be realized which is excellent in workability when drilling holes in workpieces such as housings and panels, and which is easier to use than conventional products. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic perspective view of an example of a punch tool according to an embodiment of the present invention, viewed obliquely from below. [Figure 2] FIG. 2 is a schematic perspective view of an example of a punch tool according to an embodiment of the present invention, viewed obliquely from above. [Figure 3] FIG. 3 is a schematic side view of the punch tool shown in FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view of the punch tool shown in FIG. [Figure 5] Fig. 5A is a cross-sectional view showing an example of the operation of the cylinder unit according to this embodiment, showing a state in which a bolt is inserted into the cylinder unit, Fig. 5B is a view showing a state in which the bolt is gripped following Fig. 5A, and Fig. 5C is a view showing a state in which the bolt is pulled following Fig. 5B. [Figure 6] Fig. 6A is a schematic perspective view showing an example of a bolt according to this embodiment, Fig. 6B is a schematic perspective view showing an example of a die according to this embodiment, and Fig. 6C is a schematic perspective view showing an example of a punch according to this embodiment. [Figure 7] 7A and 7B are schematic perspective views of an example of a claw portion according to this embodiment, viewed obliquely from above and below, respectively. [Figure 8] 8A and 8B are schematic perspective views of an example of a piston according to this embodiment, viewed obliquely from above and below, respectively. [Figure 9] 9A and 9B are schematic perspective views of an example of a receiving part according to this embodiment, viewed obliquely from above and below, respectively. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. This embodiment is a punch tool 1 that punches holes in a workpiece 30 such as a housing or a panel. As an example, the workpiece 30 is made of a metal plate such as a mild steel plate, a stainless steel plate, an aluminum plate, or a copper plate. In all the drawings used to explain the embodiment, members having the same function are given the same reference numerals, and repeated explanations of such members may be omitted.

[0018] 1 to 4 are schematic diagrams showing an example of a punch tool 1 according to this embodiment. The punch tool 1 includes a main body 2 that grips and pulls a bolt 17 that is inserted through a die 18 and a workpiece 30 and connected to a punch 19. The main body 2 includes a cylinder portion 3, a connecting portion 4 that connects to the cylinder portion 3, a hydraulic pump 5 that sends hydraulic oil 5b to the cylinder portion 3 via the connecting portion 4, and an electric motor 6 that drives the hydraulic pump 5.

[0019] The main body 2 has a handle portion 2a held by the operator and an attachment portion 2d to which the battery pack 16 is detachably attached. The battery pack 16, attachment portion 2d, and handle portion 2a are arranged in this order along a second axis P2. As an example, the punch tool 1 is a cordless power tool that is held by the operator on-site. To facilitate explanation of the positional relationship of each part of the punch tool 1, directions are indicated by X, Y, and Z arrows in the drawings. As shown in FIGS. 5A to 5C, the piston 8 reciprocates along the first axis P1. That is, the piston 8 moves forward in the direction opposite to the Z-direction arrow in the drawings and moves back in the direction of the Z-direction arrow in the drawings.

[0020] The main body 2 incorporates a control circuit 23 that controls the electric motor 6. The electric motor 6 and the control circuit 23 are operated by power supplied from a battery pack 16. The battery pack 16 is attached to the attachment portion 2d by a known attachment structure such as slide fitting. The battery pack 16 can be a known secondary battery such as a lithium ion battery or a nickel-metal hydride battery.

[0021] The hydraulic pump 5 has a swash plate cam 5c that rotates and is connected to a drive shaft 6a of the electric motor 6 via a reducer 6b, and a plurality of plungers that reciprocate while in contact with the swash plate cam 5c.

[0022] The main body 2 has an activation switch 2b and a release switch 2c. The activation switch 2b is arranged on the opposite side to the release switch 2c with respect to a second axis P2 that passes through the longitudinal direction of the main body 2. The main body 2 also has a pressure regulation valve 22 that regulates the pressure on the high-pressure side.

[0023] The connecting portion 4 rotatably connects the main body 2 and the cylinder portion 3. The connecting portion 4 has a first connecting portion 4a that connects to the cylinder portion 3 perpendicular to a first axis P1 that passes through the piston 8, and a second connecting portion 4b that connects to the main body 2 on a second axis P2 that passes through the drive shaft 6a of the electric motor 6. The first connecting portion 4a is a swivel shaft, and the first connecting portion 4a and the second connecting portion 4b are rotatably connected to each other. The connecting portion 4 serves both as a fluid supply line for hydraulic oil 5b and a return line for hydraulic oil 5b.

[0024] The second connecting portion 4b is inserted into a cylindrical fixing portion 4c and rotatably attached to the main body 2. The fixing portion 4c is fixedly attached to the main body 2. With this configuration, the second connecting portion 4b can be adjusted to a desired position in the circumferential direction of the second axis P2. For example, the punch tool 1 can be applied even to complicated work areas, such as when drilling additional holes in a workpiece 30 in an electrical panel, control panel, or the like.

[0025] When the operator presses the operation switch 2b, the hydraulic pump 5 enters a pressure-boosting mode in which it sends hydraulic oil 5b to the cylinder section 3. When the main body 2 enters the pressure-boosting mode, the cylinder section 3 grabs and pulls the bolt 17. When the cylinder section 3 grabs and pulls the bolt 17, the punch 19 pushes through the workpiece 30 to drill a hole.

[0026] After drilling the workpiece 30, when the operator presses the operation switch 2b, the check valve 21 operates, and the return mode is set in which the hydraulic oil 5b returns from the cylinder portion 3 to the tank 5a.

[0027] 6A is a schematic perspective view showing an example of bolt 17 according to this embodiment. Bolt 17 is a rod-shaped member made of hard metal, and has a male screw portion 17a formed on one end thereof for threading into punch 19. Also, a constricted portion 17c formed on the other end thereof for engaging with claw portion 7. A step portion 17b is formed between male screw portion 17a and constricted portion 17c, which contacts die 18 to limit its range of movement. Although the figure shows one constricted portion 17c, a configuration in which two or more constricted portions are formed in series is also possible.

[0028] 6B is a schematic perspective view showing an example of the die 18 according to this embodiment. The die 18 is made of cemented carbide, is a cylindrical member with one end closed, and has a through hole 18a through which the male thread portion 17a of the bolt 17 passes.

[0029] 6C is a schematic perspective view showing an example of punch 19 according to this embodiment. Punch 19 is made of cemented carbide and is a member having a cutting edge formed on one end side, and has female thread portion 19a that screws onto male thread portion 17a of bolt 17.

[0030] The cylinder portion 3 has a plurality of claws 7, a piston 8 that reciprocates around the claws 7, and a receiving portion 9 through which a bolt 17 is inserted and that contacts a die 18. The cylinder portion 3 also has a first coil spring 11 that presses the piston 8 so that the piston 8 approaches the die 18, and a cap 13 that is attached to the end of the cylinder portion 3 and supports the first spring 11. The cylinder portion 3 also has a second coil spring 12 that presses the claws 7 so that the claws 7 contact the piston 8. Here, the first spring 11 has a larger diameter than the second spring 12, and has a greater restoring force.

[0031] The cylinder portion 3 has a first member 14 that contacts the first spring 11 and the piston 8, and a second member 15 that contacts the second spring 12 and the claw portion 7. Both the first member 14 and the second member 15 are cylindrical members with steps. Here, the second member 15 has a smaller diameter and a longer overall length than the first member 14.

[0032] 7A and 7B are schematic perspective views showing examples of the claws 7 according to this embodiment. As an example, the claws 7 are made of a hard metal or cemented carbide member, and three claws are arranged in the circumferential direction of the first axis P1. Between the front end 7a and the rear end 7b, the claws 7 are formed with an inclined surface 7c whose outer diameter decreases as the claws approach the front end. Although the figures show three claws 7, a configuration in which four or more claws are arranged in the circumferential direction of the first axis P1 is also possible.

[0033] 8A and 8B are schematic perspective views showing an example of the piston 8 according to this embodiment. As an example, the piston 8 is a cylindrical member made of hard metal or cemented carbide. The second end 8b of the piston 8 has a larger diameter than the first end 8a, and an O-ring is disposed thereon. The first end 8a of the piston 8 is formed with a tapered surface 8c whose inner diameter decreases toward the tip. The inclined surface 7c of the claw portion 7 is configured to slidably contact the tapered surface 8c.

[0034] 9A and 9B are schematic perspective views showing examples of the receiving part 9 according to this embodiment. As an example, the receiving part 9 is a cylindrical member made of hard metal or cemented carbide. The receiving part 9 has a base part 9a and a protruding part 9b that protrudes and has a smaller diameter than the base part 9a, and a through hole 9c is formed therein.

[0035] Next, the operation of the cylinder unit 3 will be described below.

[0036] 5A is a diagram showing a state in which the bolt 17 has been inserted into the cylinder portion 3. Because the hydraulic oil 5b has returned to the tank 5a, the restoring force of the first spring 11 causes the piston 8 to contact the base 9a of the receiving portion 9. Because the second spring is compressed by the first member 14 and the second member 15, the protruding portion 9b of the receiving portion 9 presses the claw portion 7, separating the claw portion 7 from the bolt 17.

[0037] 5B is a diagram showing the state in which bolt 17 is gripped, following on from FIG. 5A. When hydraulic oil 5b is sent to cylinder portion 3, piston 8 moves away from base portion 9a and pushes first member 14, causing claw portion 7 to grip constricted portion 17c of bolt 17.

[0038] Fig. 5C shows the state after the bolt is pulled, following Fig. 5B. The inclined surfaces 7c of the claws 7 are in slidable contact with the tapered surfaces 8c of the piston 8, and the piston 8 moves forward while narrowing the circumferential spacing between the claws 7, thereby gripping and pulling the narrowed portions 17c of the bolt 17.

[0039] According to this embodiment, the punch tool 1 has excellent workability when drilling holes in the workpiece 30 such as a housing or a panel, and is easier to use than conventional punch tools.

[0040] In the above example, a punch tool 1 having a straight body has been described, but the present invention is not limited to this example. This configuration can be applied to portable punch tools in general. In the above example, a punch tool 1 in which an electric motor is used as the driving source for the hydraulic pump has been described, but the present invention is not limited to this example. The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the present invention. [Explanation of symbols]

[0041] 1 punch tool 2 Main body, 2a Handle, 2b Activation switch, 2c Release switch, 2d Mounting part 3 Cylinder section 4 Connecting part, 4a 1st connecting part, 4b 2nd connecting part, 4c Fixed part 5 Hydraulic pump, 5a Tank, 5b Hydraulic oil, 5c Swash plate cam 6 electric motor, 6a drive shaft, 6b reducer 7 Claw, 7a Tip, 7b Rear end, 7c Slanted surface 8 piston, 8a first end, 8b second end, 8c tapered surface 9 Receiving part, 9a base, 9b protrusion, 9c through hole 11 First spring 12 Second spring 13 Cap 14 First member 15 Second member 16 Battery pack 17 bolt, 17a male screw part, 17b step part, 17c constricted part 18 die, 18a through hole 19 punch, 19a female thread portion 21 Check valve 22 Pressure Regulating Valve 23 Control circuit 30 Processed part P1 1st axis P2 2nd axis

Claims

1. It has a main body that grips and pulls the bolt that has been inserted through the die and the workpiece and connected to the punch, The main body has a cylinder portion, a connecting portion connected to the cylinder portion, and a hydraulic pump that sends hydraulic oil to the cylinder portion via the connecting portion, The cylinder portion has a plurality of claws, a piston that reciprocates around the claws, a receiving portion through which the bolt is inserted and that contacts the die, a first spring that pushes the piston so that the piston approaches the die, and a second spring that pushes the claws so that the claws contact the piston, and the piston moves forward while narrowing the circumferential spacing between the claws, thereby gripping and pulling the bolt. A punch tool characterized by:

2. The first end of the piston is formed with a tapered surface whose inner diameter becomes smaller as it approaches the tip, and an inclined surface that matches the tapered surface is formed on the claw portion, and the inclined surface is in slidable contact with the tapered surface. The punch tool according to claim 1 ,

3. the cylinder portion has a first member in contact with the first spring and in contact with the piston, and a second member in contact with the second spring and in contact with the claw portion, The piston presses the first member, causing the claw portion to grip the bolt, and the first member and the second member compress the second spring, causing the claw portion to release the bolt. The punch tool according to claim 1 ,

4. the receiving portion has a base portion with which the piston comes into contact and moves away, and a protruding portion with which the claw portion comes into contact and moves away, When the piston moves away from the base and pushes the claw portion, the claw portion grips the bolt, and when the piston comes into contact with the base and the protrusion pushes the claw portion, the claw portion moves away from the bolt. The punch tool according to claim 1 ,

5. The main body has an electric motor that drives the hydraulic pump, a battery pack that supplies power to the electric motor, an attachment part to which the battery pack is detachably attached, and a handle part on which a switch is disposed, and the battery pack, the attachment part, and the handle part are arranged in this order along a second axis that passes through the drive shaft of the electric motor. The punch tool according to any one of claims 1 to 4,

6. The connecting portion has a first connecting portion that is connected to the cylinder portion perpendicular to a first axis that passes through the piston, and a second connecting portion that is connected to the main body on the second axis, and the first connecting portion and the second connecting portion are connected to each other so as to be rotatable. The punch tool according to claim 5,

7. The bolt has a male screw portion that screws into the punch, a step portion that limits the movable range of the die, and a constricted portion that engages with the claw portion.

7. The punch tool according to claim 6,

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