MACHINE FOR CUTTING AND STRIPPING BACK ELECTRIC WIRES AND CABLES

• US 3,727,492 A
• Filed: 03/18/1971
• Issued: 04/17/1973
• Est. Priority Date: 03/21/1970
• Status: Expired due to Term

• Current Assignee: Vincenzo Zanni
• Original Assignee: Vincenzo Zanni
• Inventors: Zanni, Vincenzo
• Primary Examiner(s): Riordon, Robert C.
• Assistant Examiner(s): Parker, Roscoe V.
• Application Number:
  US05/125,782
• Time in Patent Office: 761 Days
• Field of Search: 81/9.51,9.5A,9.5R 83/924
• US Class Current: 81/9.43
• CPC Class Codes: H02G 1/1212 using wire or cable clamping means

Abstract

A hand-held device is disclosed for cutting electrical wires and cables while stripping the sheath from a short section thereof. Two pairs of jaws are provided, the first pair clamping a section of the wire, while the second pair, which is pivotally movable relative to the first pair in the direction of the wire axis, notches and strips the wires sheath, and cuts the wire. The device is powered by compressed air actuated piston.

Claims

1. A device for cutting and stripping back sheathed wirEs or cables, comprising first and second pairs of jaws disposed side by side, said first jaws being adapted to clamp a section of the wire, said second jaws being adapted to cut an end of said wire and to notch the sheath of the wire between said end and the clamped section, one of said pairs of jaws being pivotally mounted relative to the other, so that the one pair is able to be moved away from the other pair substantially in the direction of the axis of the wire or cable clamped in the first jaws, and means for actuating, in succession, the closure of the first jaws, the closure of the second jaws, and the pivotal movement of the one pair of jaws away from the other pair.

2. A device according to claim 1, wherein the actuating means comprise first and second wheels, one of which is rotatably mounted on a jaw of each of said first and second pairs of jaws, and a first cam adapted to coact, in succession, with said first and second wheels of said first and second pairs of jaws, thereby actuating the closure of said jaws, and including spring means for maintaining said jaws normally open.

3. A device according to claim 1, wherein said actuating means comprise a roller rotatably mounted on the pivotally mounted pair of jaws and a cam coacting with said roller to actuate pivotal movement of the pivotally mounted pair of jaws away from the other pair of jaws, and including a spring means for holding said first and second pairs of jaws normally in contact with each other.

4. A device according to claim 2, wherein said actuating means comprise a roller rotatably mounted on the pivotally mounted pair of jaws and a second cam coacting with said roller to actuate pivotal movement of the pivotally mounted pair of jaws away from the other pair of jaws, and including a second spring means for holding said first and second pairs of jaws normally in contact with each other.

5. A device according to claim 4, comprising a pneumatic cylinder including a piston to drive said actuating means,and a control lever which is displaced to actuate said cylinder, and wherein said actuating means comprise a longitudinally movable slide connected to said piston and including said first and second cams.

6. A device according to claim 5, wherein said control lever is disposed parallel to the body of the machine for actuation by one hand of an operator holding the device.

7. A device according to claim 5, wherein the slide is substantially T-shaped, including a leg and cross-member, the cross-member of the slider comprising said first and second cams each of which has substantially the shape of an inclined plane, the leg of the slider being connected through a rod with the piston of the pneumatic cylinder.

8. A device according to claim 7, including a casing of said pneumatic cylinder integral with support means for pivotally mounting one jaw of said one pair of jaws and for securing one jaw of said other pair of jaws.

9. A device according to claim 5, including valve means operable by said control lever for admitting compressed air to said pneumatic cylinder whereby said piston is moved from a rest position toward said jaws, and including spring means for returning said piston to the rest position.

10. A device according to claim 4, wherein said first cam is an inclined plane whose dimensions are so limited relative to said first wheel that the pivotal coaction of said second cam and said roller cause disengagement of said first cam and said first roller, allowing the first pair of jaws to spring open.

11. A device according to claim 1, wherein said second pair of jaws comprise a first pair of active edges to shear the end of the wire or cable, and a second pair of active edges to cut the notch in the sheath of the wire, the edges of the second pair being so spaced from one another that they cut the notch in the sheath when the edges of the first pair shear the wire or cable.

12. A device according to claim 11, wherein said second pair of jaws comprises first and secOnd pairs of blades, said pairs of blades being integral with said first and second pairs of active edges.

13. A device according to claim 11, wherein one jaw of said first pair of jaws comprises a clamping surface mounted on an intermediary pad of yieldable material.