US4254540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stamped bevel gear
Assignee: Individual
•
Filing: 1978-09-27
•
Granted: 1981-03-10
•
Expires: 1998-09-27
Abstract
Abstract A method of manufacturing gear forms comprising cold forming metal stock to produce a workpiece having a protruding hub portion with a central opening, impressing indentations in the hub portion by means of appropriate dies, boring and counterboring the region around the hub portion, and modifying the central opening according to the configuration of a shaft to be received thereby.
Inventors
- 👤 William Bilak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:36
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/26; B21D53/28; B21K; B21K1/00; B21K1/28; B21K1/30; B23; B23P; B23P15/00; B23P15/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49462; Y10T29/49467; Y10T29/49478
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
117 words
A method for manufacturing a gear form having an integral hub with a central opening for receiving a drive shaft having a predetermined cross-sectional shape, said method comprising the steps of: (a) piercing a hole defined by an edge in a metal stock workpiece; (b) forming a protrusion in the region of the stock including the hole, without substantially restricting the flow of displaced metal along the length of the protrusion; (c) compressing the protrusion with no forming tools in the hole, to a predetermined height without substantially restricting the flow of the displaced metal into the edge of the hole; and (c) piercing the region surrounding the hole to the cross-sectional shape of the drive shaft.
Claim 2
Independent Claim
117 words
A method for manufacturing a gear form having an integral hub with a central opening for receiving a drive shaft having a predetermined cross-sectional shape, said method comprising the steps of: (a) piercing a hole defined by an edge in a metal stock workpiece; (b) forming a protrusion in the region of the stock including the hole, without substantially restricting the flow of displaced metal along the length of the protrusion; (c) compressing the protrusion with no forming tools in the hole, to a predetermined height without substantially restricting the flow of the displaced metal into the edge of the hole; and (c) piercing the region surrounding the hole to the cross-sectional shape of the drive shaft.
Claim 3
Dependent Claim
24 words
The invention according to claim 1 and further including a step of enlarging the hole in conjunction with the step of forming the protrusion.
Claim 4
Dependent Claim
36 words
The invention according to claim 1 and including the further step of forming a first depression in the region about the hole without substantially restricting the flow of displaced metal into the region of the hole.
Claim 5
Dependent Claim
21 words
The invention according to claim 3 wherein the step of forming the first depression is accomplished by coining the first depression.
Claim 6
Dependent Claim
33 words
The invention according to claim 3 and further including the step of forming a second depression in the region about the hole on the opposite side of the workpiece from the first depression.
Claim 7
Dependent Claim
21 words
The invention according to claim 5 wherein the step of forming the second depression is accomplished by coining the second depression.
Claim 8
Dependent Claim
44 words
The invention according to claim 1 wherein the hole has a central axis, and the method includes the further step of forming a plurality of equi-angularly disposed indentations on the exterior of the protrusion extending parallel to and about the axis of the hole.
Claim 9
Dependent Claim
47 words
The invention according to claim 1 and including the further step of forming a center counterbore in the region about the hole with a diameter at least as great as the greatest lateral dimension of the cross-section of the drive shaft, prior to the final piercing step.
Claim 10
Dependent Claim
20 words
The invention according to claim 8 wherein the step of forming the center counterbore is accomplished by coining the counterbore.
Claim 11
Dependent Claim
52 words
The invention according to claim 1, wherein said step of forming a protrusion comprises forming the protrusion using a round-ended punch and a flat die, said die having an opening sufficient to accept said protrusion when said punch enters said workpiece and having no other restriction to the flow of displaced metal.
Claim 12
Independent Claim
129 words
A method for manufacturing a gear form having an integral hub with a central opening for receiving a drive shaft having predetermined cross-sectional shape, said method comprising the steps of: piercing a hold defined by an edge in a metal stock workpiece; forming a protrusion in the region of the stock including the hole, without substantially restricting the flow of displaced metal along the length of the protrusion; compressing the protrusion to a predetermined height without any forming tool in the hole and without substantially restricting the flow of the displaced metal into the edge of the hole; piercing the region surrounding the hole to the cross-sectional shape of the drive shaft; and flattening the uppermost surface of the protrusion without substantially restricting the flow of the displaced metal.
Claim 13
Independent Claim
129 words
A method for manufacturing a gear form having an integral hub with a central opening for receiving a drive shaft having predetermined cross-sectional shape, said method comprising the steps of: piercing a hold defined by an edge in a metal stock workpiece; forming a protrusion in the region of the stock including the hole, without substantially restricting the flow of displaced metal along the length of the protrusion; compressing the protrusion to a predetermined height without any forming tool in the hole and without substantially restricting the flow of the displaced metal into the edge of the hole; piercing the region surrounding the hole to the cross-sectional shape of the drive shaft; and flattening the uppermost surface of the protrusion without substantially restricting the flow of the displaced metal.
Claim 14
Independent Claim
156 words
A method for manufacturing a gear form having an integral hub with a central opening for receiving a drive shaft having a predetermined cross-sectional shape, said method comprising the steps of: piercing a hole defined by an edge in a metal stock workpiece; forming a protrusion in the region of the stock including the hole, without substantially restricting the flow of displaced metal along the length of the protrusion; compressing the protrusion to a predetermined height without any forming tool in the hole and without substantially restricting the flow of the displaced metal into the edge of the hole; piercing the region surrounding the hole to the cross-sectional shape of the drive shaft; and forming a plurality of equi-angularly disposed indentations on the exterior of the protrusion extending parallel to and about the axis of the hole, said forming step comprising causing the displaced metal to flow inimpededly and build up the area about said hole.
Claim 15
Independent Claim
156 words
A method for manufacturing a gear form having an integral hub with a central opening for receiving a drive shaft having a predetermined cross-sectional shape, said method comprising the steps of: piercing a hole defined by an edge in a metal stock workpiece; forming a protrusion in the region of the stock including the hole, without substantially restricting the flow of displaced metal along the length of the protrusion; compressing the protrusion to a predetermined height without any forming tool in the hole and without substantially restricting the flow of the displaced metal into the edge of the hole; piercing the region surrounding the hole to the cross-sectional shape of the drive shaft; and forming a plurality of equi-angularly disposed indentations on the exterior of the protrusion extending parallel to and about the axis of the hole, said forming step comprising causing the displaced metal to flow inimpededly and build up the area about said hole.
References Cited (Backward Citations)
US2072308A
Cited
US2127969A
Cited
US2157354A
Cited
US2850794A
Cited
US3354689A
Cited
US3434327A
Cited
US3895922A
Cited
US3893818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |