US4078291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable rivet anvil
Assignee: Individual
•
Filing: 1976-10-01
•
Granted: 1978-03-14
•
Expires: 1996-10-01
Abstract
Abstract A rivet anvil for replacing rivets holding sickles, such as on hay and grass mowers, combines, and other machinery, while in the field, has a base with an upstanding rod. A rivet seat is formed in the top of the rod and is sized to accept and hold a rivet head while its post is peened. The anvil is relatively lightweight and can be carried with the machine.
Inventors
- 👤 Ruth E. Broemmelsiek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:02
CPC Classifications
B; B21; B21J; B21J15/00; B21J15/38; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53991
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
335 words
A field anvil for supporting a rivet as it is peened to attach a sickle to a support bar at a location having a rough or soft terrain, such as an agricultural field, comprising: a base and an upstanding rod, the base being approximately square in shape with each side having a length approximately one-third the heighth of the rod and the base having a thickness of approximately one-eighth the length of a side to provide a substantial area compared with its mass to distribute the impact force applied to the anvil and effectively transmit the force to a support while firmly supporting the rod and preventing its flexing, the base thereby incorporating the mass of the earth on rough or soft terrain and maintaining the anvil and a rivet in a substantially fixed orientation with respect to a sickle and support bar during peening, the rod being approximately cylindrical and extending upwardly from the approximate center of the base and thereby distributing the impact load substantially equally across the full area of the base to prevent flexing of the rod during peening, the rod having a tapered section near its uppermost end to aid in fitting the rod against the rivet head and between any supporting structure surrounding the members being riveted without substantially weakening the rod or increasing its susceptibility to breakage during peening, the rod having a top surface, the taper terminating at the apex of the rod to circumscribe the top surface, the top surface being substantially flat and having means forming a curvilinear identation of approximately hemispherical shape with a diameter approximately two-thirds that of the top surface, the curvilinear indentation being adapted to receive less than all of the rivet head and sufficiently retain the rivet in a stationary mode relative to the sickle and support bar to thereby minimize the area of the top surface required and maximize the allowable taper, and the anvil thus being suitable for use with rivets having minimum clearance from other supporting structure.
Claim 2
Dependent Claim
335 words
A field anvil for supporting a rivet as it is peened to attach a sickle to a support bar at a location having a rough or soft terrain, such as an agricultural field, comprising: a base and an upstanding rod, the base being approximately square in shape with each side having a length approximately one-third the heighth of the rod and the base having a thickness of approximately one-eighth the length of a side to provide a substantial area compared with its mass to distribute the impact force applied to the anvil and effectively transmit the force to a support while firmly supporting the rod and preventing its flexing, the base thereby incorporating the mass of the earth on rough or soft terrain and maintaining the anvil and a rivet in a substantially fixed orientation with respect to a sickle and support bar during peening, the rod being approximately cylindrical and extending upwardly from the approximate center of the base and thereby distributing the impact load substantially equally across the full area of the base to prevent flexing of the rod during peening, the rod having a tapered section near its uppermost end to aid in fitting the rod against the rivet head and between any supporting structure surrounding the members being riveted without substantially weakening the rod or increasing its susceptibility to breakage during peening, the rod having a top surface, the taper terminating at the apex of the rod to circumscribe the top surface, the top surface being substantially flat and having means forming a curvilinear identation of approximately hemispherical shape with a diameter approximately two-thirds that of the top surface, the curvilinear indentation being adapted to receive less than all of the rivet head and sufficiently retain the rivet in a stationary mode relative to the sickle and support bar to thereby minimize the area of the top surface required and maximize the allowable taper, and the anvil thus being suitable for use with rivets having minimum clearance from other supporting structure.
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) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |