US3611918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Press
Assignee: Perkins Machine Co
•
Filing: 1969-09-29
•
Granted: 1971-10-12
•
Expires: 1989-09-29
Abstract
Abstract Press with counterbalanced ram mounted for longitudinal reciprocation in a frame, a pitman being coupled to the ram and connected to a crankshaft for pivotal movement with respect to a first axis spaced from the axis of rotation of the crankshaft, a counterweight for the ram being mounted for longitudinal reciprocation and being aligned with the ram, and a pitman assembly coupled to the counterweight and connected to the crankshaft for pivotal movement with respect to a second axis spaced from the axis of rotation of the crankshaft and in a direction opposite the direction of spacing of the first axis.
Inventors
- 👤 Daniel W Marsh
- 👤 Bertram W Perkins Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:38
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/0064; Y; Y10; Y10T; Y10T83/00; Y10T83/869; Y10T83/8821; Y10T83/8824
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
A press having a bed, a ram mounted for longitudinal reciprocation toward and away from said bed, a crankshaft mounted to be driven in rotation about a first axis, a first pitman assembly coupled to said ram and connected to said crankshaft for pivotal movement with respect to a second axis spaced from said first axis, a counterweight for said ram mounted for longitudinal reciprocation and aligned with said ram, and a second pitman assembly coupled to said counterweight and connected to said crankshaft for pivotal movement with respeCt to a third axis spaced from said first axis in a direction opposite the direction of said spacing of said second axis, said counterweight being adapted to receive a selected supplementary weight to balance a selected tool mounted on said ram.
Claim 2
Dependent Claim
130 words
A press having a bed, a ram mounted for longitudinal reciprocation toward and away from said bed, a crankshaft mounted to be driven in rotation about a first axis, a first pitman assembly coupled to said ram and connected to said crankshaft for pivotal movement with respect to a second axis spaced from said first axis, a counterweight for said ram mounted for longitudinal reciprocation and aligned with said ram, and a second pitman assembly coupled to said counterweight and connected to said crankshaft for pivotal movement with respeCt to a third axis spaced from said first axis in a direction opposite the direction of said spacing of said second axis, said counterweight being adapted to receive a selected supplementary weight to balance a selected tool mounted on said ram.
Claim 3
Dependent Claim
65 words
The press of claim 1 wherein each said pivotal movement of a said pitman assembly includes longitudinal and transverse components of reciprocation, the longitudinal components of said respective assemblies occuring in opposite directions, the transverse components of said respective assemblies occuring in opposite directions, said assemblies being of relative weights chosen so that forces associated with said respective longitudinal and transverse components balance each other.
Claim 4
Dependent Claim
39 words
The press of claim 1 wherein said first pitman assembly comprises a ram pitman, said second pitman assembly comprises two counterweight pitmans which straddle said ram pitman, said counterweight pitmans being of higher density material than said ram pitman.
Claim 5
Dependent Claim
30 words
The press of claim 3 wherein each of said two counterweight pitmans includes side portions not structurally required and present only to increase the weight of said two counterweight pitmans.
Claim 6
Dependent Claim
50 words
The press of claim 3 wherein said two counterweight pitmans and said first pitman assembly are of generally equal weight, said first axis is midway between said second an third axes, and all portions of said first pitman assembly undergo combined longitudinal and transverse reciprocation during operation of said press.
Claim 7
Dependent Claim
31 words
The press of claim 1 wherein said axes are coplanar, said first axis is midway between said second and third axes, and said counterweight and said ram are of equal weight.
Claim 8
Dependent Claim
15 words
The press of claim 1 wherein said counterweight is recessed to receive said supplementary weight.
Claim 9
Dependent Claim
14 words
The press of claim 1 wherein said counterweight is mounted for reciprocation along gibs.
References Cited (Backward Citations)
US2321325A
Cited
US3450038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |