Patent US3720993A successfully refreshed from Google Patents.
US3720993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction welding method
Assignee: Caterpillar Inc
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Filing: 1970-10-26
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Granted: 1973-03-20
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Expires: 1990-10-26
Abstract
Abstract Friction-welding apparatus comprising a rack and pinion for translating force from a unidirectionally, linearly acting hydraulic motor into rotational force and applying the resultant rotational force to one of a pair of relatively rotatable weld pieces. Programming means regulate operation of the hydraulic motor to precisely determine energy input to a weld interface between the weld pieces.
Inventors
- 👤 C Farmer
- 👤 C Loyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:10
CPC Classifications
F; F16; F16H; F16H19/00; F16H19/02; F16H19/04; B; B23; B23K; B23K20/00; B23K20/12; B23K20/121
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
In a method of the kind in which two metal weld pieces are bonded across a common interface while the pieces are relatively moved in rubbing contact until their interface is brought to a plastic condition, the steps comprising pressing the pieces together at their interface, driving the pieces in rubbing contact by motor means effective to produce a precisely controlled, limited amount of unidirectional, linear motion during the welding portion of each weld cycle, and translating the unidirectional, linear motion of the motor means into reciprocating motion for application to weld pieces to set them into relatively reciprocating motion.
Claim 2
Dependent Claim
100 words
In a method of the kind in which two metal weld pieces are bonded across a common interface while the pieces are relatively moved in rubbing contact until their interface is brought to a plastic condition, the steps comprising pressing the pieces together at their interface, driving the pieces in rubbing contact by motor means effective to produce a precisely controlled, limited amount of unidirectional, linear motion during the welding portion of each weld cycle, and translating the unidirectional, linear motion of the motor means into reciprocating motion for application to weld pieces to set them into relatively reciprocating motion.
Claim 3
Dependent Claim
109 words
In a method of the kind in which two metal weld pieces are bonded across a common interface by pressing the pieces together at the interface while the pieces are relatively moved in rubbing contact until their interface is brought to a plastic condition, the steps comprising pressing the pieces together at their interface, driving the pieces in rubbing contact by motor means effective to produce a precisely controlled, limited amount of unidirectional, linear motion during the welding portions of each weld cycle, and translating the unidirectional, linear motion of the motor means into rotational motion for application to the weld pieces to set them into relatively rotating motion.
Claim 4
Dependent Claim
109 words
In a method of the kind in which two metal weld pieces are bonded across a common interface by pressing the pieces together at the interface while the pieces are relatively moved in rubbing contact until their interface is brought to a plastic condition, the steps comprising pressing the pieces together at their interface, driving the pieces in rubbing contact by motor means effective to produce a precisely controlled, limited amount of unidirectional, linear motion during the welding portions of each weld cycle, and translating the unidirectional, linear motion of the motor means into rotational motion for application to the weld pieces to set them into relatively rotating motion.
Claim 5
Dependent Claim
25 words
The method of claim 2 wherein the step of translating unidirectional, linear motion into rotational motion is accomplished by means of a rack and pinion.
Claim 6
Dependent Claim
32 words
The method of claim 1 further comprising the step of selectively programming the unidirectional, linear motion of the motor means to precisely regulate energy input to the interface of the weld pieces.
Claim 7
Dependent Claim
44 words
The method of claim 4 wherein the step of selectively programming the unidirectional, linear motion of the motor means is effective to precisely and selectively regulate rate and duration of relative motion between the weld pieces during the welding portion of each weld cycle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |