Punching tool for mobile use

Abstract

A punching tool that is capable of being used and modified independently of the shape of an opening to be punched, and is capable of being used for all round, angular and/or special-shaped tool contours. The punching tool generally comprises a cylinder with a fastener and a die having a lead-through for the fastener and a cavity with a stamp that is configured to connect to the fastener such that a spacer bushing is held to the cylinder.

Claims

1. A punching tool for mobile use, comprising: a cylinder that has a first end and a second end, an adapter with a fastening means attached to said cylinder and configured to connect to a piston of the cylinder, the adapter being at least partially insertable into the cylinder at the first end, the first end of the cylinder having an end face and the cylinder having a lateral surface; a die having a lead-through for the fastening means and a cavity, and a stamp which is configured to connect to the fastening means, a spacer bushing, the spacer bushing having a receiving opening for receiving the adapter and a lead-through for the fastening means; wherein the spacer bushing is held to the cylinder by a first magnetic means; wherein the first magnetic means are arranged in the end face or on the lateral surface of the cylinder, wherein the die is held on the spacer bushing by second magnetic means, wherein the second magnetic means are arranged in an end face or on a lateral surface of the spacer bushing.

2. The punching tool according claim 1, wherein the fastening means is a screw.

3. The punching tool according to claim 1, wherein clearances are provided in the end face of the die facing the spacer bushing.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) FIG. 1 a schematic exploded view of a punching tool 1 according to the invention in accordance with a first embodiment, and

(2) FIG. 2 a schematic exploded view of a punching tool 1 according to the invention in accordance with a second embodiment.

DETAILED DESCRIPTION OF THE INVENTION

(3) In the figures, all the same components are designated with the same reference signs, but for reasons of clarity not all reference signs are necessarily inserted in all illustrations.

(4) The punching tool 1 according to the invention belongs to the mobile hydraulic/pneumatic tools which occur in the prior art in a variety of embodiments. A drive piston, which is hydraulically or pneumatically adjustable in a housing of the punching tool 1 between a starting position and an end position and slides in the cylinder 11, is used to actuate a tool unit connected to this drive piston. In the case of the embodiments shown here, the tool unit is the adapter 13a with fastening means 13b attached thereto, which in turn carry the die 17 and stamp 19 for the actual punching process.

(5) FIG. 1 shows the punching tool 1 according to a first embodiment in a schematic, partially cut-away exploded view. The adapter 13a, which is connected to the drive piston not shown here, is inserted into the cylinder 11. In the adapter 13a, the fastening means 13b is received in a force-fitting manner, for example screwed. In this embodiment, the adapter 13a and the fastening means 13b are designed as one component and are permanently connected to each other.

(6) The fastening means 13b is pushed with its end facing away from the cylinder 11 through the lead-through 153 of the spacer bushing 15 until the adapter 13a rests in the receiving opening 151. According to the invention, the spacer bushing 15 is held on the cylinder by the first magnetic means 21. In the embodiment shown, permanent magnets (e.g. neodymium magnets) are embedded in the end face 111 of the cylinder 11 as first magnetic means 21.

(7) These permanent magnets may be recessed flat with the end face 111 for maximum magnetic force. Alternatively, the permanent magnets may be located slightly lower than the face 111 so that the magnetic force on the spacer bushing 15 to be held is reduced. In this way, different magnetic forces can be realised depending on the size and weight of the spacer bushing 15 and the other components to be attached.

(8) The die 17 is now pushed over the free end of the fastening means 13b, so that the fastening means 13b extends through its lead-through 173 and the cavity 171. In this embodiment, the die 17 is attached to the first magnetic means 21 via second magnetic means 23.

(9) The punching die 1 according to the invention, which is largely assembled in this way, can now be brought up to the material to be punched and positioned as a force-locked assembly without any of the components falling off.

(10) For the punching process, the still free outer end of the fastening means 13b is now guided through a pre-drilled hole in the material to be punched and the stamp 19 is attached to the fastening means 13b from the opposite side, for example by screwing it tight.

(11) By actuating the punching tool, the stamp 19 is now pulled through the material to be punched into the cavity 171 and punches out the desired opening.

(12) FIG. 2 shows the punching tool 1 according to the invention according to a second embodiment alternative to the first embodiment in a schematic, partially cut-away exploded view. FIG. 2 is largely identical to FIG. 1, so that the basic construction need not be described again.

(13) The important difference here is that the adapter 13a and the fastening means 13b are made in two parts. In addition, the fastening means 13b has at least one projection 13b1, which is arranged inside the cavity 171 of the die 17 in the assembled state.

(14) After the punching process, the punched waste piece of the punched material is located in the cavity 171 of the die 17, where it can get stuck depending on the type of material, its thickness and other factors. In order to remove the waste piece from the die of a conventional punching tool, additional tooling or auxiliary devices may have to be used, which can be quite time consuming.

(15) However, by the particular embodiment of the present invention, the waste piece can very easily be reached by pushing the fastening means 13b, whereby the projection 13b1 engages behind the waste piece and pushes it out of the die 17.

(16) Furthermore, in the illustration of FIG. 2, the die 17 is not held to the spacer bushing 15 by second magnetic means 23, but by mechanical means. These mechanical means may, for example, consist of a screw connection or a bayonet lock. The advantages of the preferably provided extended bushing 153b have already been discussed above.

(17) However, such a connection by mechanical means is not mandatory for the embodiment shown. Thus, also in the second embodiment, the die 17 can be held to the spacer bushing 15 by second magnetic means 23.

REFERENCE SIGN

(18) 1 punching tool 11 cylinder 111 front surface of the cylinder 13a adapter 13b fastening means 13b1 projection 15 spacer bushing 151 receiving opening 153 lead-through for spacer bushing 155 end face of spacer bushing 157 clearances 159 end face of spacer bushing 17 die 171 cavity 173 lead-through of the die 175 end face of die 19 stamp 21 first magnetic means 23 second magnetic means