US3558847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric resistance welding electrode holder for holding two electrodes in balanced force contact
Assignee: Tuffaloy Products Inc
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Filing: 1968-06-04
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Granted: 1971-01-26
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Expires: 1988-06-04
Abstract
Abstract A variable condition compensating and equalizing dual electrode holder having cam-surfaced pistons supporting the electrodes and a barrel cam coacting with the cam surfaces on the pistons. The pistons are resiliently extended by springs and one piston retracts upon contact until the other piston makes contact with the workpiece in advancing movement of the holder. This action is permitted by transverse movement of the barrel. Further inward movement of the pistons due to advancing movement of the holder locks the pistons in their different extensions against the barrel. Further advancing movement of the holder presses the electrodes into equal contact with the workpiece. Coolant circulation is provided by tubular pistons and coaxial tubes and transferring coolant across the holder body through the barrel cam cavity from side apertures in the tubular pistons.
Inventors
- 👤 Robert B Width
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:57
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/30; B23K11/31; B23K11/312
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
305 words
A compensating electrode holder for making electric resistance welds with two electrodes for substantially equalizing varying conditions at one electrode relative to the other electrode to effect substantially equal welds by making substantial equal engagement of both electrodes against a workpiece, comprising: a holder body having paired cylinders and a transverse cam-track cavity between said cylinders: a piston in each said cylinder, and a round barrel in said cavity between said pistons; said pistons being relieved to form a lower cam surface on said pistons below said round barrel relief on said pistons leading from said cavity; said cam surface being adapted to engage said round barrel; said device bEing so coordinated as to allow axial movement of said pistons relative to each other and to said round barrel and to allow transverse movement of said barrel relative to said pistons; said pistons having outer ends beyond said holder body equipped with sockets for mounting electrodes therein; said pistons being selectively moved axially inwardly of said holder body when said holder body advances electrodes mounted on said pistons into engagement with a workpiece; said round barrel allowing different distances of axial inward movement of said pistons by transverse movement of said round barrel of said round barrel between said lower cam surfaces on said pistons so as to engage said lower cam surfaces at different rise points on said cam surfaces; said round barrel when in engagement with both said lower cam surfaces of both said pistons being jammed therebetween preventing further axial inward movement of both said pistons securing said pistons and electrodes in their so adjusted axial projection; and said pistons, cam surfaces, and round barrel by relative movement between each other thereby allowing for different axial extension of electrodes mounted on said pistons to compensate different workpiece engagement conditions at the electrodes.
Claim 2
Dependent Claim
305 words
A compensating electrode holder for making electric resistance welds with two electrodes for substantially equalizing varying conditions at one electrode relative to the other electrode to effect substantially equal welds by making substantial equal engagement of both electrodes against a workpiece, comprising: a holder body having paired cylinders and a transverse cam-track cavity between said cylinders: a piston in each said cylinder, and a round barrel in said cavity between said pistons; said pistons being relieved to form a lower cam surface on said pistons below said round barrel relief on said pistons leading from said cavity; said cam surface being adapted to engage said round barrel; said device bEing so coordinated as to allow axial movement of said pistons relative to each other and to said round barrel and to allow transverse movement of said barrel relative to said pistons; said pistons having outer ends beyond said holder body equipped with sockets for mounting electrodes therein; said pistons being selectively moved axially inwardly of said holder body when said holder body advances electrodes mounted on said pistons into engagement with a workpiece; said round barrel allowing different distances of axial inward movement of said pistons by transverse movement of said round barrel of said round barrel between said lower cam surfaces on said pistons so as to engage said lower cam surfaces at different rise points on said cam surfaces; said round barrel when in engagement with both said lower cam surfaces of both said pistons being jammed therebetween preventing further axial inward movement of both said pistons securing said pistons and electrodes in their so adjusted axial projection; and said pistons, cam surfaces, and round barrel by relative movement between each other thereby allowing for different axial extension of electrodes mounted on said pistons to compensate different workpiece engagement conditions at the electrodes.
Claim 3
Dependent Claim
87 words
In a device as set forth in claim 1: an upper cam surface on each said piston above said round barrel; said pistons having inner ends within said holder body; a spring in each said cylinder between said inner end of each said piston and said holder body; and said springs resiliently displaceably urging said piston upper cam surfaces against said barrel to roll said round barrel to center between said piston to position said pistons outer ends at maximum axial outer projection of said holder body.
Claim 4
Dependent Claim
189 words
In a device as set forth in claim 1: said pistons being axially hollow; said holder body having fluid coolant inlet and outlet orifices and channels; one said orifice and channel leading to one said cylinder and the other said orifice and channel leading to the other said cylinder; a tube lying coaxially in each said piston with each said tube connected to one said orifice and channel; each said piston having a radial aperture communicating between its axial hollow interior and said cam track cavity of said holder body; said coaxial tubes having bottom ends adjacent said piston sockets; coolant fluid fed into one said orifice and channel traveling down said coaxial tube to an electrode in said piston socket; back up the associated said piston hollow interior to its radial aperture, through said radial aperture, cam track cavity and said radial aperture of the other said piston into its hollow interior; down said other piston''s hollow interior to an electrode mounted in said other piston socket; and back up said other piston''s said associated coaxial tube to the other said channel and orifice of said holder body.
References Cited (Backward Citations)
US2623973A
Cited
US2976599A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |