US3599469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming gears
Assignee: Nachi Machining Technology Co
•
Filing: 1968-08-19
•
Granted: 1971-08-17
•
Expires: 1988-08-19
Abstract
Abstract Method and apparatus for forming a gear from a cylindrical blank by forcing it through a circular-toothed die. The ends of the teeth of the die are tapered to facilitate displacement of metal. The blank is subjected to a multiplicity of rapid impacts by means equivalent to an air hammer.
Inventors
- 👤 Arthur B Bassoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:40
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/28; B21K1/30; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49462; Y10T29/49467; Y10T29/49474
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
Apparatus for forming an external gear from an annular blank having an outer cylindrical surface whose diameter is substantially equal to the pitch diameter of the gear to be formed, comprising an internally toothed annular die having longitudinally tapered teeth, a stationary support for said die engaging said die outwardly of the tooth spaces thereof, a cylindrical pilot in alignment with said die, a movable blank support comprising an arbor having a cylindrical portion slidable longitudinally in said pilot, a reduced portion adapted to enter into and guidingly support the blank, and an annular radial shoulder engaging a side of the blank, a driver loosely connected to said arbor, and means for reciprocating said driver to deliver a multiplicity of rapid impacts of a magnitude on the order of several hundred foot-pounds from said driver directly to said arbor to drive said blank through said die.
Claim 2
Dependent Claim
146 words
Apparatus for forming an external gear from an annular blank having an outer cylindrical surface whose diameter is substantially equal to the pitch diameter of the gear to be formed, comprising an internally toothed annular die having longitudinally tapered teeth, a stationary support for said die engaging said die outwardly of the tooth spaces thereof, a cylindrical pilot in alignment with said die, a movable blank support comprising an arbor having a cylindrical portion slidable longitudinally in said pilot, a reduced portion adapted to enter into and guidingly support the blank, and an annular radial shoulder engaging a side of the blank, a driver loosely connected to said arbor, and means for reciprocating said driver to deliver a multiplicity of rapid impacts of a magnitude on the order of several hundred foot-pounds from said driver directly to said arbor to drive said blank through said die.
Claim 3
Dependent Claim
37 words
Apparatus as defined in claim 1 in which helical teeth are formed on the blank comprising helical teeth on said die, and helical teeth extending between the pilot and the portion of the arbor slidable longitudinally therein.
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |