GB2054443A - Manually operated punching tool - Google Patents

Abstract

A manually operated punching tool (Figure 4) for cutting keyways in for example metal or plastics material has a die (20) in which is slidably movable a punch (16). The punch has opposed, lateral extensions, one of which is seen at (23) and each extension has a recess, one of which is seen at (24). In addition the tool has handles (11,11) pivotally connected at a pin (13) on which the movable punch (16) and fixed die (20) are also mounted. The handles are connected by pivots (15, 15, 17) to move the punch (16) relative to the die (20) so that a sheet of material placed edgewise in a recessed portion (24) can be slit when the punch is pulled down against the top of the die. <IMAGE>

Description

SPECIFICATION Manually operated punching tool This invention relates to a manually operated punching tool.

A slitting tool is known from U.S. Patent No.

3,263,545 and has a movable die that cuts a slit in metal or plastics. The force used to move the die to cut the slit is on a direct or one-to-one ratio. Also U.S. Patent No. 4,111,022 shows a manual crimping tool having two levers to move the jaws.

The tool of the present invention is primarily for punching or cutting uniform keyways in metal or non-ferrous material and its design provides for either a wider or narrower keyway. According to this invention a manually operated tool comprises:a pair of handles, pivotally connected by a first pin means; a punch means having a recessed bore connected to the first pin means; die means having a bore extending longitudinally therethrough and connected to the first pin means by a bore normal to the longitudinally extending bore; and linkage means having one end pivotally connected to each handle and pivotally connected at the other end to the punch means, whereby movement of the handles produces longitudinally movement of the punch means relative to the die means.

The invention will now be described by way of example, with reference to the drawings, in which:- Figure 1 is a side elevation of the tool; Figure 2 is a top plan as seen from the plane 2-2 of Figure 1; Figure 3 is an enlarged fragmentary elevation of the top part of the tool; Figure 4 is a section at right angles to the plane of Figure 3; Figure 5 shows the die; Figure 6 is a top plane of the die; Figure 7 is a side elevation of a punch tool; Figure 8 is a front elevation of the punch tool; Figure 9 is the top plane of the punch tool; and Figure 10 is a section of the punch and die showing the relative location of the recesses and the respective uses thereof.

Referring to the drawings, Figure 1 shows a manually operated tool 10 comprising a pair of handles 11 pivotally movable to position 12 (shown dotted) about a pivot pin 13. A plurality of linkages 14 is connected pivotally at one end of the linkage 14 to a punch tool 16 by a pivot pin 17. Pivotal movement of the handles outwardly at pivot pin 13 and pivotal movement of linkages 14 causes upward movement of the punch tool 16 by virtue of a recess 18 that provides for slidable movement of the punch tool 16 within the limits provided by the length of the recess 18.

A die 20 is mounted around the punch tool 16 and connected to the tool by means of pivot pin 13. That is, a longitudinal bore 19 in the die is aligned with the recess 18 of the punch tool 16 and connected to the handles 11 by means of pivot pin 13. Movement of the handles 11 causes upward movement of the punch tool 16 whereas the die 20 remains stationary.

The punch tool 16 has a bore at one end so as to be pivotally connected to the linkage 14 by pivot pin 17.

The upper end of punch tool 16 has two cutters 23 and 25 along the longitudinal axis thereof, that are diametrically opposite extensions of each other, that is, they are 1800 apart. However, it is possible for the cutter extension to be at different angular positions.

Each cutter extension 23, 25 has a recess 24, 26, respectively.

The die 20 comprises a bore 22 having longitudinal recesses 22,28 aligned with the protruding cutter extensions 23,25 of the punch tool 16.

It is apparent from Figure 6 that the recesses 22, 27 are of different sizes, but correspond to the sizes of the cutter extension 23, 25, see Figure 9. As shown in Figure 10, a cross-sectional view of the material W to be notched is brought up against the punch tool, and aligned in the recess 26. Movement of the handles 11 inwardly toward each other causes downward movement of the punch tool 16 to the position shown in Figure 4, and in so moving the cutter 25 causes the workpiece material to be notched.

In operation, the operator moves the handles 11 outwardly to move the cutters 23,25 above the die 20 and the tool is moved into position wherein the recess of either cutter 23 or 25 abuts the material to be removed. Then, the operator closes or moves the handles toward each other causing the cutter, either 23 or 25, to remove the metal between the top portion of die 20 and either of the cutter extensions 23 or 25.

1. A manually operated tool comprising: a pair of handles, pivotally connected by a first pin means; a punch means having a recessed bore connected to the first pin means; die means having a bore extending longitudinally therethrough and connected to the first pin means by a bore normal to the longitudinally extending bore; and linkage means having one end pivotally connected to each handle and pivotally connected at the other end to the punch means, whereby movement of the handles produces longitudinal movement of the punch means relative to the die means.

2. Atool according to claim 1 wherein the punch means has a plurality of longitudinal cutter extensions, each extension having a recessed portion intermediate its length and the die means having longitudinal recesses aligned with the cutter extensions.

3. A tool according to claim 2 wherein the cutter extension are different in size, and the longitudinal recesses correspond in size to that of the cutter extensions.

4. A tool according to claim 2 or claim 3 wherein the recessed portion on each cutter extension is aligned with the die whereby longitudinal movement of the punch means will effect each recessed portion as moved below the top portion of the die.

5. A manually operated punching tool constructed and arranged substantially as herein described and shown in the drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Manually operated punching tool This invention relates to a manually operated punching tool. A slitting tool is known from U.S. Patent No. 3,263,545 and has a movable die that cuts a slit in metal or plastics. The force used to move the die to cut the slit is on a direct or one-to-one ratio. Also U.S. Patent No. 4,111,022 shows a manual crimping tool having two levers to move the jaws. The tool of the present invention is primarily for punching or cutting uniform keyways in metal or non-ferrous material and its design provides for either a wider or narrower keyway. According to this invention a manually operated tool comprises:a pair of handles, pivotally connected by a first pin means; a punch means having a recessed bore connected to the first pin means; die means having a bore extending longitudinally therethrough and connected to the first pin means by a bore normal to the longitudinally extending bore; and linkage means having one end pivotally connected to each handle and pivotally connected at the other end to the punch means, whereby movement of the handles produces longitudinally movement of the punch means relative to the die means. The invention will now be described by way of example, with reference to the drawings, in which:- Figure 1 is a side elevation of the tool; Figure 2 is a top plan as seen from the plane 2-2 of Figure 1; Figure 3 is an enlarged fragmentary elevation of the top part of the tool; Figure 4 is a section at right angles to the plane of Figure 3; Figure 5 shows the die; Figure 6 is a top plane of the die; Figure 7 is a side elevation of a punch tool; Figure 8 is a front elevation of the punch tool; Figure 9 is the top plane of the punch tool; and Figure 10 is a section of the punch and die showing the relative location of the recesses and the respective uses thereof. Referring to the drawings, Figure 1 shows a manually operated tool 10 comprising a pair of handles 11 pivotally movable to position 12 (shown dotted) about a pivot pin 13. A plurality of linkages 14 is connected pivotally at one end of the linkage 14 to a punch tool 16 by a pivot pin 17. Pivotal movement of the handles outwardly at pivot pin 13 and pivotal movement of linkages 14 causes upward movement of the punch tool 16 by virtue of a recess 18 that provides for slidable movement of the punch tool 16 within the limits provided by the length of the recess 18. A die 20 is mounted around the punch tool 16 and connected to the tool by means of pivot pin 13. That is, a longitudinal bore 19 in the die is aligned with the recess 18 of the punch tool 16 and connected to the handles 11 by means of pivot pin 13. Movement of the handles 11 causes upward movement of the punch tool 16 whereas the die 20 remains stationary. The punch tool 16 has a bore at one end so as to be pivotally connected to the linkage 14 by pivot pin 17. The upper end of punch tool 16 has two cutters 23 and 25 along the longitudinal axis thereof, that are diametrically opposite extensions of each other, that is, they are 1800 apart. However, it is possible for the cutter extension to be at different angular positions. Each cutter extension 23, 25 has a recess 24, 26, respectively. The die 20 comprises a bore 22 having longitudinal recesses 22,28 aligned with the protruding cutter extensions 23,25 of the punch tool 16. It is apparent from Figure 6 that the recesses 22, 27 are of different sizes, but correspond to the sizes of the cutter extension 23, 25, see Figure 9. As shown in Figure 10, a cross-sectional view of the material W to be notched is brought up against the punch tool, and aligned in the recess 26. Movement of the handles 11 inwardly toward each other causes downward movement of the punch tool 16 to the position shown in Figure 4, and in so moving the cutter 25 causes the workpiece material to be notched. In operation, the operator moves the handles 11 outwardly to move the cutters 23,25 above the die 20 and the tool is moved into position wherein the recess of either cutter 23 or 25 abuts the material to be removed. Then, the operator closes or moves the handles toward each other causing the cutter, either 23 or 25, to remove the metal between the top portion of die 20 and either of the cutter extensions 23 or 25. CLAIMS

1. A manually operated tool comprising: a pair of handles, pivotally connected by a first pin means; a punch means having a recessed bore connected to the first pin means; die means having a bore extending longitudinally therethrough and connected to the first pin means by a bore normal to the longitudinally extending bore; and linkage means having one end pivotally connected to each handle and pivotally connected at the other end to the punch means, whereby movement of the handles produces longitudinal movement of the punch means relative to the die means.

2. Atool according to claim 1 wherein the punch means has a plurality of longitudinal cutter extensions, each extension having a recessed portion intermediate its length and the die means having longitudinal recesses aligned with the cutter extensions.

3. A tool according to claim 2 wherein the cutter extension are different in size, and the longitudinal recesses correspond in size to that of the cutter extensions.

4. A tool according to claim 2 or claim 3 wherein the recessed portion on each cutter extension is aligned with the die whereby longitudinal movement of the punch means will effect each recessed portion as moved below the top portion of the die.

5. A manually operated punching tool constructed and arranged substantially as herein described and shown in the drawings.