Patent US3711915A successfully refreshed from Google Patents.
US3711915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making toothed racks
Assignee: Individual
•
Filing: 1971-08-05
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Granted: 1973-01-23
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Expires: 1991-08-05
Abstract
Abstract The flame of a cutting torch is passed through a central longitudinal zone of an elongated blank so that the kerf forms two rack sections with substantially identical teeth thereon. Rack sections with such flame cut teeth are secured together in side-by-side relationship, with their teeth in endwise register, to form a rack exceeding the thickness of the blanks from which the rack sections are cut. Before flame cutting of the teeth is commenced, thin slices are flame cut from opposite faces of the blank which are to become the backs of the rack sections, to prevent warping of the flame cut rack sections along their lengths.
Inventors
- 👤 G Maxon
- 👤 W Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:41
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/14; B23K; B23K7/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49462; Y10T29/49467; Y10T29/49789; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/1967
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
The method of making a rack, which is characterized by the steps of: A. cutting through an elongated blank of rectangular cross section to produce a kerf which extends from one wide side of the blank to the other along its length and defines two laterally adjacent rack sections with equispaced meshing teeth thereon that are substantially identical in shape and size; B. laying one rack section against the other in such orientation that the teeth on the two sections project in the same direction, and a number of teeth on one section are in exact register with teeth on the other section; C. and securing the sections together in said orientation to form a single rack having a width equal to twice the thickness of the blank from which the sections were cut.
Claim 2
Independent Claim
134 words
The method of making a rack, which is characterized by the steps of: A. cutting through an elongated blank of rectangular cross section to produce a kerf which extends from one wide side of the blank to the other along its length and defines two laterally adjacent rack sections with equispaced meshing teeth thereon that are substantially identical in shape and size; B. laying one rack section against the other in such orientation that the teeth on the two sections project in the same direction, and a number of teeth on one section are in exact register with teeth on the other section; C. and securing the sections together in said orientation to form a single rack having a width equal to twice the thickness of the blank from which the sections were cut.
Claim 3
Dependent Claim
36 words
The method of making a rack according to claim 1, wherein said one section when layed against the other is displaced lengthwise of its original position a distance equal to one-half the spacing of its teeth.
Claim 4
Dependent Claim
34 words
The method of making a rack according to claim 1, wherein prior to the cutting of teeth in the blank, thin slices are flame cut from the narrow longitudinal side edges of the blank.
Claim 5
Dependent Claim
70 words
The method of making a rack according to claim 1, wherein: A. the teeth are cut by a flame passing through the blank from one wide side thereof, as a consequence of relative movement between the flame and the blank; B. and said one section is layed against the other with the faces of the sections corresponding to said one wide side of the blank in contact with one another.
Claim 6
Dependent Claim
37 words
The method of making a rack according to claim 4, wherein said one section when layed against the other is displaced lengthwise of its original position a distance equal to one-half of the spacing of its teeth.
Claim 7
Dependent Claim
40 words
The method of making a rack according to claim 5, wherein the flame cutting of teeth in the blank is preceded by a flame cutting operation in which thin slices are cut from the narrow longitudinal edges of the blank.
Claim 8
Dependent Claim
75 words
The method of making a rack according to claim 5, wherein: A. flame cutting of the teeth is commenced at one end of the blank and relative motion between the blank and the flame advances the later toward the other end of the blank; B. and the blank is free to expand lengthwise toward said one end thereof as it is heated by the flame, while being restrained against thermal expansion in the opposite direction.
Claim 9
Dependent Claim
92 words
The method of making a rack according to claim 1, wherein: A. the teeth are cut by a flame as a consequency of relative movement between the flame and the blank; B. flame cutting is commenced at one end of the blank and relative movement between the blank and the flame advances the latter towArd the other end of the blank; C. and the blank is free to expand lengthwise toward said one end thereof as it is heated by the flame, while being restrained against thermal expansion in the opposite direction.
Claim 10
Dependent Claim
36 words
The method of making a rack according to claim 8, wherein the flame is passed through the central zone of the blank at an equal average distance from the opposite longitudinal narrow edges of the blank.
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |