Patent US2388241A successfully refreshed from Google Patents.
US4026732A
Expired / Lapsed
US
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Method for induction hardening gear teeth
Assignee: Cincinnati Steel Treating Co
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Filing: 1975-08-28
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Granted: 1977-05-31
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Expires: 1995-08-28
Abstract
Abstract A method and apparatus for obtaining full tooth width induction hardening of gear teeth. The method comprises attaching gear teeth shaped non-magnetic material templates to the opposite sides of the gears in close proximity to but spaced from the sides of the gear teeth. The gear teeth are then progressively induction hardened by passing a current intensifier between the aligned teeth of the templates and the gears while maintaining current flow to the intensifier for the full width of travel of the intensifier between the gear teeth. In the preferred embodiment the faces and roots of the templates are slightly undersize relative to the faces and roots of the gear teeth and the tops of the teeth of the template are slightly oversize and extend beyond the tips of the teeth of the gear.
Inventors
- 👤 Howard W. Dammel
- 👤 Robert M. Frantz
- 👤 James H. Luke
- 👤 William G. Skrzypczyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:49
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/06; C21D1/09; C21D1/10; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
129 words
The method of heat treating oppositely facing working surfaces of adjacent gear teeth so as to obtain a substantially uniform depth heat treatment across the full width of the gear teeth, which method comprises the steps of locating a pair of gear tooth contoured templates in close proximity to but spaced from opposite sides of the gear teeth, and heating the oppositely facing working surfaces of adjacent gear teeth by progressively moving a current intensifier sequentially between a pair of gear teeth of one template, between the oppositely facing working surfaces of the adjacent gear teeth, and between a pair of gear teeth of the other template while maintaining current flow through the intensifier as the intensifier passes between the oppositely facing working surfaces of the adjacent gear teeth.
Claim 2
Independent Claim
129 words
The method of heat treating oppositely facing working surfaces of adjacent gear teeth so as to obtain a substantially uniform depth heat treatment across the full width of the gear teeth, which method comprises the steps of locating a pair of gear tooth contoured templates in close proximity to but spaced from opposite sides of the gear teeth, and heating the oppositely facing working surfaces of adjacent gear teeth by progressively moving a current intensifier sequentially between a pair of gear teeth of one template, between the oppositely facing working surfaces of the adjacent gear teeth, and between a pair of gear teeth of the other template while maintaining current flow through the intensifier as the intensifier passes between the oppositely facing working surfaces of the adjacent gear teeth.
Claim 3
Dependent Claim
29 words
The method of claim 1 in which each of said gear tooth contoured templates is spaced between approximately 0.015 and 0.025 inches from one side of the gear teeth.
Claim 4
Independent Claim
145 words
The method of heat treating oppositely facing working surfaces of adjacent gear teeth so as to obtain a substantially uniform depth heat treatment across the full width of the gear teeth, which method comprises the steps of forming a pair of low electrical resistance templates having peripheral contours similar to the peripheral contour of said gear teeth, positioning said pair of contoured templates in close proximity to but spaced from opposite sides of the gear teeth, and heating the oppositely facing working surfaces of adjacent gear teeth by progressively moving a current intensifier sequentially between a pair of teeth of one template, between the oppositely facing working surfaces of the adjacent gear teeth, and between a pair of teeth of the other template while maintaining current flow through the intensifier as the intensifier passes between the oppositely facing working surfaces of the adjacent gear teeth.
Claim 5
Independent Claim
145 words
The method of heat treating oppositely facing working surfaces of adjacent gear teeth so as to obtain a substantially uniform depth heat treatment across the full width of the gear teeth, which method comprises the steps of forming a pair of low electrical resistance templates having peripheral contours similar to the peripheral contour of said gear teeth, positioning said pair of contoured templates in close proximity to but spaced from opposite sides of the gear teeth, and heating the oppositely facing working surfaces of adjacent gear teeth by progressively moving a current intensifier sequentially between a pair of teeth of one template, between the oppositely facing working surfaces of the adjacent gear teeth, and between a pair of teeth of the other template while maintaining current flow through the intensifier as the intensifier passes between the oppositely facing working surfaces of the adjacent gear teeth.
Claim 6
Dependent Claim
27 words
The method of claim 3 in which each of said contoured templates is spaced between approximately 0.015 and 0.025 inches from one side of the gear teeth.
Claim 7
Independent Claim
170 words
The method of heat treating oppositely facing working surfaces of adjacent gear teeth so as to obtain a substantially uniform depth heat treatment across the full width of the gear teeth, which method comprises the steps of forming a pair of low electrical resistance templates having peripheral contours similar to the peripheral contours of said gear teeth, said templates having teeth formed thereon the sides and roots of which are undersize relative to the sides and roots of said gear teeth, and positioning said pair of contoured templates in close proximity to but spaced from opposite sides of the gear teeth, and heating the oppositely facing working surfaces of adjacent gear teeth by progressively moving a current intensifier sequentially between a pair of teeth of one template, between the oppositely facing working surfaces of the adjacent gear teeth, and between a pair of teeth of the other template while maintaining current flow through the intensifier as the intensifier passes between the oppositely facing working surfaces of the adjacent gear teeth.
Claim 8
Independent Claim
170 words
The method of heat treating oppositely facing working surfaces of adjacent gear teeth so as to obtain a substantially uniform depth heat treatment across the full width of the gear teeth, which method comprises the steps of forming a pair of low electrical resistance templates having peripheral contours similar to the peripheral contours of said gear teeth, said templates having teeth formed thereon the sides and roots of which are undersize relative to the sides and roots of said gear teeth, and positioning said pair of contoured templates in close proximity to but spaced from opposite sides of the gear teeth, and heating the oppositely facing working surfaces of adjacent gear teeth by progressively moving a current intensifier sequentially between a pair of teeth of one template, between the oppositely facing working surfaces of the adjacent gear teeth, and between a pair of teeth of the other template while maintaining current flow through the intensifier as the intensifier passes between the oppositely facing working surfaces of the adjacent gear teeth.
Claim 9
Dependent Claim
27 words
The method of claim 5 in which each of said contoured templates is spaced between approximately 0.015 and 0.025 inches from one side of the gear teeth.
Claim 10
Independent Claim
185 words
The method of heat treating oppositely facing working surfaces of adjacent gear teeth so as to obtain a substantially uniform depth heat treatment across the full width of the gear teeth, which method comprises the steps of forming a pair of low electrical resistance templates having peripheral contours similar to the peripheral contour of said gear teeth, said templates having teeth formed thereon the sides and roots of which are undersize relative to the sides and roots of said gear teeth and the tips of which are oversize relative to the tips of said gear teeth, and positioning said pair of contoured templates in close proximity to but spaced from opposite sides of the gear teeth, and heating the oppositely facing working surfaces of adjacent gear teeth by progressively moving a current intensifier sequentially between a pair of teeth of one template, between the oppositely facing working surfaces of the adjacent gear teeth, and between a pair of teeth of the other template while maintaining current flow through the intensifier as the intensifier passes between the oppositely facing working surfaces of the adjacent gear teeth.
Claim 11
Independent Claim
185 words
The method of heat treating oppositely facing working surfaces of adjacent gear teeth so as to obtain a substantially uniform depth heat treatment across the full width of the gear teeth, which method comprises the steps of forming a pair of low electrical resistance templates having peripheral contours similar to the peripheral contour of said gear teeth, said templates having teeth formed thereon the sides and roots of which are undersize relative to the sides and roots of said gear teeth and the tips of which are oversize relative to the tips of said gear teeth, and positioning said pair of contoured templates in close proximity to but spaced from opposite sides of the gear teeth, and heating the oppositely facing working surfaces of adjacent gear teeth by progressively moving a current intensifier sequentially between a pair of teeth of one template, between the oppositely facing working surfaces of the adjacent gear teeth, and between a pair of teeth of the other template while maintaining current flow through the intensifier as the intensifier passes between the oppositely facing working surfaces of the adjacent gear teeth.
Claim 12
Dependent Claim
27 words
The method of claim 7 in which each of said contoured templates is spaced between approximately 0.015 and 0.025 inches from one side of the gear teeth.
Claim 13
Independent Claim
127 words
The method of heat treating a ferrous metal object so as to obtain a substantially uniform depth heat treatment across the full width of the object, which method comprises the steps of locating a pair of templates of approximately the same peripheral contour as said metal object in close proximity to but spaced from at least a portion of a pair of opposite sides of the object, and heating said metal object between said opposite sides of said object by sequentially and progressively moving a current intensifier past one of said templates, between said opposite sides of said metal object, and past the other one of said templates while maintaining current flow through the intensifier as the intensifier passes between said opposite sides of said metal object.
Claim 14
Independent Claim
127 words
The method of heat treating a ferrous metal object so as to obtain a substantially uniform depth heat treatment across the full width of the object, which method comprises the steps of locating a pair of templates of approximately the same peripheral contour as said metal object in close proximity to but spaced from at least a portion of a pair of opposite sides of the object, and heating said metal object between said opposite sides of said object by sequentially and progressively moving a current intensifier past one of said templates, between said opposite sides of said metal object, and past the other one of said templates while maintaining current flow through the intensifier as the intensifier passes between said opposite sides of said metal object.
Claim 15
Dependent Claim
31 words
The method of claim 9 in which at least a portion of each of said templates is spaced between approximately 0.015 and 0.025 inches from said opposite sides of said object.
References Cited (Backward Citations)
US3592703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |