Patent US3899093A successfully refreshed from Google Patents.
← Back to Patent Explorer
US3899093A Expired / Lapsed US ⏱️ 0.0 years remaining

Anti-tipping log skidder

Assignee: Caterpillar Inc
•
Filing: 1973-04-18
•
Granted: 1975-08-12
•
Expires: 1993-04-18
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A log skidder has a pair of upper and lower rollers mounted rearwardly of a towing winch to receive a cable therefrom. In normal operation, the cable is solely guided over the upper roller whereas during the ascent of a steep grade, for example, the cable is further received under the lower roller to substantially decrease the tipping moment arm imposed on the log skidder.

Inventors

  • 👤 Jan K Allen

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 23:25
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/28; B66D1/36; B60; B60P; B60P3/00; B60P3/40; B60P3/41

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 190 words
A log skidder disposed on a longitudinal axis thereof comprising a frame, a towing winch mounted on said frame and having a cable wrapped thereon, first cable guide means mounted on and vertically above said frame and positioned rearwardly of said towing winch, said cable received and guided over said first cable guide means, and second cable guide means fixedly mounted on said frame substantially below said first guide means and constructed to define an opening for selectively permitting said cable to be placed thereunder from said first guide means to substantially shorten the tipping moment arm of said log skidder during selecteD phases of operation thereof, said second cable guide means comprising a roller rotatably mounted on and between a pair of first and second support brackets and wherein said first bracket is attached to said frame by releasable fastening means and said second bracket is pivotally mounted on said frame by pivot means whereby release of said releasable fastening means will permit said roller to be pivoted along with said second bracket about said pivot means on said frame to allow insertion of said cable under said roller.
Claim 2
Dependent Claim 190 words
A log skidder disposed on a longitudinal axis thereof comprising a frame, a towing winch mounted on said frame and having a cable wrapped thereon, first cable guide means mounted on and vertically above said frame and positioned rearwardly of said towing winch, said cable received and guided over said first cable guide means, and second cable guide means fixedly mounted on said frame substantially below said first guide means and constructed to define an opening for selectively permitting said cable to be placed thereunder from said first guide means to substantially shorten the tipping moment arm of said log skidder during selecteD phases of operation thereof, said second cable guide means comprising a roller rotatably mounted on and between a pair of first and second support brackets and wherein said first bracket is attached to said frame by releasable fastening means and said second bracket is pivotally mounted on said frame by pivot means whereby release of said releasable fastening means will permit said roller to be pivoted along with said second bracket about said pivot means on said frame to allow insertion of said cable under said roller.
Claim 3
Dependent Claim 17 words
The log skidder of claim 1 further comprising a bulldozer assembly mounted on a forward end thereof.
Claim 4
Dependent Claim 30 words
The log skidder of claim 1 wherein said frame comprises front and rear frames connected together by a vertically disposed pivot means, said towing winch mounted on said rear frame.
Claim 5
Dependent Claim 29 words
The log skidder of claim 1 wherein said first cable guide means comprises a roller rotatably mounted on a logging frame secured on the frame of said log skidder.
Claim 6
Dependent Claim 26 words
The log skidder of claim 4 wherein said roller is rotatably mounted on a box-like fairlead, secured on said logging frame to confine said cable therein.
Claim 7
Dependent Claim 26 words
The log skidder of claim 1 wherein said second cable guide means is disposed in at least substantial vertical alignment, below said first cable guide means.
Claim 8
Dependent Claim 41 words
The log skidder of claim 1 wherein said pivot means is at least generally disposed in alignment with the longitudinal axis of said log skidder to permit said roller to be pivoted vertically downwardly upon release of said releasable fastening means.

References Cited (Backward Citations)

US2700481A Cited
US2869741A Cited
US3086666A Cited
US3322396A Cited
US3477596A Cited
US3515297A Cited
US3794296A Cited
US3762584A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-08-11 1979-02-10 1979-08-12 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-08-11 1983-02-10 1983-08-12 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-08-11 1987-02-10 1987-08-12 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag