US3807472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shear mechanism for timber harvesting machine
Assignee: Individual
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Filing: 1972-04-19
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Granted: 1974-04-30
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Expires: 1992-04-19
Abstract
Abstract A shear mechanism for mounting on the forward end of a forwardly movable vehicle comprising a forwardly extending generally horizontal main frame having a rearwardly extending opening in the front end thereof to provide rigid support for a pair of shear blades pivotally mounted on the frame on opposite sides of the opening. The opening in the frame is of predetermined width to limit the size of tree that can enter the opening and the shear blades have cutting edges which are located within the opening both in the open and closed positions of the blades. A power assist mechanism is provided for insuring the desired cutting action of the blades on a tree and in one form of the invention the cutting edges of the blades are of a particular serrated construction to combine a fiber spreading and shearing action on a tree being cut.
Inventors
- 👤 R Propst
- 👤 H Propst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:22
CPC Classifications
A; A01; A01G; A01G23/00; A01G23/02; A01G23/08; A01G23/087; A01G23/089
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
153 words
In a timber harvesting machine which includes a forwardly movable vehicle, a shear mechanism mounted on the forward end of said vehicle and comprising a forwardly extending generally horizontal main frame having a rearwardly extending opening in the front end thereof of predetermined width, a pair of shear blades pivotally mounted on said frame on opposite sides of said opening and having cutting edges located within said opening, said blades being pivotally movable between open positions in which said edges are located in a forwardly diverging relation in said opening and closed positions in which said edges are substantially parallel and adjacent each other in said opening, said blades having the forward ends thereof spaced apart a distance greater than said predetermined width in said open position of said blades so that said forward ends of the blades are positioned on opposite sides of said opening in said open positions of said blades.
Claim 2
Dependent Claim
153 words
In a timber harvesting machine which includes a forwardly movable vehicle, a shear mechanism mounted on the forward end of said vehicle and comprising a forwardly extending generally horizontal main frame having a rearwardly extending opening in the front end thereof of predetermined width, a pair of shear blades pivotally mounted on said frame on opposite sides of said opening and having cutting edges located within said opening, said blades being pivotally movable between open positions in which said edges are located in a forwardly diverging relation in said opening and closed positions in which said edges are substantially parallel and adjacent each other in said opening, said blades having the forward ends thereof spaced apart a distance greater than said predetermined width in said open position of said blades so that said forward ends of the blades are positioned on opposite sides of said opening in said open positions of said blades.
Claim 3
Dependent Claim
89 words
A shear mechanism according to claim 1 further including a generally horizontal slide member slidably mounted on said frame at a position rearwardly of said blades, a pair of links pivotally connecting said slide member and said blades such that on rearward movement of said slide member said blades are moved toward said closed positions and on forward movement of said slide member said blades are moved toward said open positions, and power means connected to said slide member and operable to move said slide member rearwardly and forwardly.
Claim 4
Dependent Claim
56 words
A shear mechanism according to claim 1 wherein each of said cutting edges is of serrated construction having a plurality of substantially V-shape notches comprised of outwardly diverging leg surfaces, each of said leg surfaces terminating at the outer end thereof in a substantially vertical edge and at The inner end thereof in a shearing point.
Claim 5
Dependent Claim
37 words
A shear mechanism according to claim 3 wherein each of said leg surfaces is of a decreasing width in an inward direction and is bounded on the top and bottom sides thereof by generally triangular inclined surfaces.
Claim 6
Dependent Claim
37 words
A shear mechanism according to claim 2 wherein said power means comprises a pair of fluid actuated cylinder assemblies mounted on said main frame and disposed on transversely opposite sides of and connected to said slide member.
Claim 7
Dependent Claim
25 words
A shear mechanism according to claim 2 further including a bumper bar connected to said slide member and positioned to extend across said blade edges.
Claim 8
Dependent Claim
116 words
A shear mechanism according to claim 2 further including first and second switch means on said main frame, and means connected to said slide member operable to actuate said first switch means in response to movement of said blades from said open positions toward said closed positions, said last mentioned means being operable to actuate said second switch means in response to movement of said slide member to a position corresponding to said closed positions of said blades, said power means being operable to move said slide member rearwardly in response to actuation of said first switch means and being operable to move said slide member forwardly in response to actuation of said second switch means.
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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |