THERMAL HAND TOOLS

• US 3,752,017 A
• Filed: 04/08/1971
• Issued: 08/14/1973
• Est. Priority Date: 04/08/1971
• Status: Expired due to Term

• Current Assignee: Pace, Inc.
• Original Assignee: Loring E. Young, Richard E. Lloyd, William J. Siegel
• Inventors: Lloyd, Richard E., Young, Loring E., Siegel, William J.
• Primary Examiner(s): Riordon, Robert C.
• Assistant Examiner(s): Parker, Roscoe V.
• Application Number:
  US05/132,499
• Time in Patent Office: 859 Days
• Field of Search: 81/9.5B,9.5R,9.51,43 219/221,227,230,231,232,233,234,235 128/303.1,303.13,303.14,354 83/170,171 30/140
• US Class Current: 81/9.44
• CPC Class Codes: B23K 3/0307 with current flow through the workpiece
• CPC Class Codes: B29C 65/18 using heated tools
• CPC Class Codes: B29C 65/305 involving the use of cartridge heaters
• CPC Class Codes: B29C 66/8221 Scissor or lever mechanisms, i.e. involving a pivot point
• CPC Class Codes: B29C 66/8227 using springs
• CPC Class Codes: B29C 66/83241 cooperating pivoting tools
• CPC Class Codes: B29C 66/8614 Tongs, pincers or scissors
• CPC Class Codes: H02G 1/1275 by applying heat
• CPC Class Codes: H05B 3/0004 Devices wherein the heating current flows through the material to be heated Circuit arrangements for heating by passing the current directly across the material to be heated H05B3/0023; granular, powdered or fluid material H05B3/60

Abstract

The present invention relates to a group of hand thermal tools of simplified construction wherein each has the same upper and lower hand grip members hinged together adjacent to their rear ends and moreover the upper and lower grip member may be identical. A power lead line, extending in at the rear of the grip members, powers each tool. The three distinct thermal hand tools contemplated are; resistance tweezers, conductive tweezers, and wire stripper. The resistance tweezers has a single conductor rod in each grip member extending the length thereof and a tweezer blade removably mounted at the forward end of each rod whereby an electrically conductive object tweezed between the blades becomes resistance heated. The conductive tweezers and the thermal wire stripper each utilize a pair of conductive rods in each grip member extending the length thereof and a resistance heated blade member mounted across the forward ends of each rod pair. In the conductive tweezer, a gripping blade is removably mounted across the forward ends of each rod pair, the blades being opposed so that an object tweezed therebetween becomes heated by thermal conductivity. In the wire stripper, a cutting blade is mounted across the forward end of each rod pair, the blades being in opposing cutting relationship whereby an insulated wire may have the insulation stripped therefrom by the cutting action of the heated blades.

Claims

1. A thermal wire stripper comprising;

upper and lower insulated grip members hinged together adjacent the rear ends thereof;

a pair of electrically conductive guide rods disposed in each grip member and extending forward of said grip member;

an electrically conductive blade member disposed across the forward end faces of each rod pair, the blades being in opposing cutting relationship;

an electrical power lead connection at the rear of said grip members connected to each rod pair to cause resistance heating of the blades;

an adjustment means mounted at the rear of said members adjustably limiting the maximum open position spread of said grip members; and

stop block means slidably mounted on the rods adjustably limiting the closest approach permitted for the blade members.

2. A thermal wire stripper according to claim 1 including a stop block slidably mounted on the rods in the lower grip member said stop block having a beveled upper surface;

and an identical stop block slidably mounted on the rods of the upper grip member, the engagement position of the beveled surfaces predetermining the closest approach permitted for the blades.

3. A thermal wire stripper according to claim 2 wherein a third identical Stop block is slidably mounted on one of the rod pairs adjacent the blade end thereof, said third block serving as a spacer element to predetermine the length of wire to be stripped.

4. A thermal wire stripper according to claim 1 wherein the grip members are identical.