Patent US4590782A successfully refreshed from Google Patents.
US4590782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making of a bevel gear
Assignee: KM Kabelmetal AG
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Filing: 1980-07-03
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Granted: 1986-05-27
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Expires: 2000-07-03
Abstract
Abstract A bevel gear is made by means of a die, a punch, and two concentrical counterpunches, one having a particularly contoured extension. A cylindrical blank, having a diameter not larger than the smallest bevel gear root circle, is inserted in the die; a portion is held by one counterpunch but reverse-extruded in part into the gap between that counterpunch and the advancing punch. A portion of the blank inserted into the interior of the die flows concurrently radially into the small-diameter portion of the die cavity. Subsequently, the reverse-extruded, tubular portion is forced back in parts by the second counterpunch, acting in the gap, to fill the large-diameter portion of the cavity. A tubular shaft extension may remain on the gear.
Inventors
- 👤 Herbert Leykamm
- 👤 Siegfried Knabel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:48
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/28; B21K1/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
Apparatus for making bevel gear, comprising: a die having a cavity for forming a bevel gear; a punch disposed for relative advance to and into the die cavity; a first counterpunch coaxially disposed to the punch and having an annular extension into the cavity, there being a gap between the first counterpunch and the punch, said extension including a cylindrical part, being slightly smaller than any radially adjacent innermost diameter dimension of the die cavity for a disposition of abutment of the first counterpunch and the die; and a second counterpunch disposed in said gap being movable in relation to the punch, but also advancing with the punch.
Claim 2
Dependent Claim
108 words
Apparatus for making bevel gear, comprising: a die having a cavity for forming a bevel gear; a punch disposed for relative advance to and into the die cavity; a first counterpunch coaxially disposed to the punch and having an annular extension into the cavity, there being a gap between the first counterpunch and the punch, said extension including a cylindrical part, being slightly smaller than any radially adjacent innermost diameter dimension of the die cavity for a disposition of abutment of the first counterpunch and the die; and a second counterpunch disposed in said gap being movable in relation to the punch, but also advancing with the punch.
Claim 3
Dependent Claim
73 words
Apparatus for making bevel gear, comprising: a die having a cavity for forming a bevel gear having a cylindrical, spline-shaft-type extension; a punch disposed for relative advance to and into the die cavity; a first counterpunch coaxially disposed to the punch, there being a gap between the first counterpunch and the punch; and a second counterpunch disposed in said gap being movable in relation to the punch, but also advancing with the punch.
Claim 4
Dependent Claim
73 words
Apparatus for making bevel gear, comprising: a die having a cavity for forming a bevel gear having a cylindrical, spline-shaft-type extension; a punch disposed for relative advance to and into the die cavity; a first counterpunch coaxially disposed to the punch, there being a gap between the first counterpunch and the punch; and a second counterpunch disposed in said gap being movable in relation to the punch, but also advancing with the punch.
Claim 5
Dependent Claim
15 words
Apparatus as in claim 2, said first counterpunch having an annular extension into the cavity.
Claim 6
Dependent Claim
41 words
Apparatus as in claim 3, said extension having a conical tip, the cone angle being approximately equal to a cone angle of the root cone of the bevel gear to be made and as defined by the cavity and its contour.
Claim 7
Dependent Claim
28 words
Apparatus as in claim 2, said extension having radial, gear-like teeth, insertable in grooves of the spline-shaft-like extension as defined by extensions of ridges of the die cavity.
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) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |