Patent US3765730A successfully refreshed from Google Patents.
US3765730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for automatically adjusting track shoe assembly in crawler tractor
Assignee: Komatsu Ltd
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Filing: 1971-07-30
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Granted: 1973-10-16
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Expires: 1991-07-30
Abstract
Abstract A device for automatically adjusting the track shoe assembly in a crawler tractor which comprises serially providing a spring whose rear end is supported on the track frame, a capacity variable pressure storing chamber containing pressurized fluid, and a capacity variable adjusted pressure chamber for containing pressurized fluid for operating the piston provided on the end of the rod connected to the front idler of the track assembly; automatically feeding the pressurized fluid of said pressure storing chamber into said adjusted pressure chamber when the pressure of the fluid of said adjusted pressure chamber is insufficient to expand the track by operating the front idler through said piston with said automatic feeding of pressurized fluid, wherein when the pressure of the fluid of said adjusted pressure chamber is large, said spring is loosened through the pressurized fluid within said pressure storing chamber to reduce the impact given to said front idler and track.
Inventors
- 👤 S Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:20
CPC Classifications
B; B62; B62D; B62D55/00; B62D55/08; B62D55/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
239 words
A device for automatically adjusting the track shoe assembly of a crawler tractor comprising: a. a sprocket mounted on the rear portion of a track frame; b. a front idler; c. a track shoe spanned on said sprocket and front idler; d. an adjusted pressure chamber including a first cylinder and a first piston mounted on the end of a first rod said first rod being coupled to said idler: e. a pressure storing chamber including a second cylinder connected to the rear end portion of said first cylinder; f. first and second seats wherein said first seat moves within said second cylinder, and said second seat is fixed to said track frame; g. a spring positioned between said first and second seats; and h. valve means connected between said pressure storing chamber and said adjusted pressure chamber said valve means including a spool means and a pressure adjusting spring wherein said spool means is positioned such that the force of said spring is on one side and the pressure of said adjusted pressure chamber is on the other side whereby when the pressure in said adjusted pressure chamber falls below a predetermined value the valve means permits fluid communication and thus the transfer Of fluid from said pressure storing chamber to said adjusted pressure chamber thereby moving said first rod and thereby said idler to cause said track shoe to be tightened on said sprocket and front idler.
Claim 2
Independent Claim
239 words
A device for automatically adjusting the track shoe assembly of a crawler tractor comprising: a. a sprocket mounted on the rear portion of a track frame; b. a front idler; c. a track shoe spanned on said sprocket and front idler; d. an adjusted pressure chamber including a first cylinder and a first piston mounted on the end of a first rod said first rod being coupled to said idler: e. a pressure storing chamber including a second cylinder connected to the rear end portion of said first cylinder; f. first and second seats wherein said first seat moves within said second cylinder, and said second seat is fixed to said track frame; g. a spring positioned between said first and second seats; and h. valve means connected between said pressure storing chamber and said adjusted pressure chamber said valve means including a spool means and a pressure adjusting spring wherein said spool means is positioned such that the force of said spring is on one side and the pressure of said adjusted pressure chamber is on the other side whereby when the pressure in said adjusted pressure chamber falls below a predetermined value the valve means permits fluid communication and thus the transfer Of fluid from said pressure storing chamber to said adjusted pressure chamber thereby moving said first rod and thereby said idler to cause said track shoe to be tightened on said sprocket and front idler.
Claim 3
Dependent Claim
61 words
A device for automatically adjusting the expansion of a track shoe assembly of a crawler tractor according to claim 1 wherein a second rod is fixed in the central portion of the first seat, and one end portion of said second rod is movably inserted into the second cylinder and a stopper is provided on the end of said second rod.
Claim 4
Dependent Claim
48 words
A device for automatically adjusting the expansion of a track shoe assembly of a crawler tractor according to claim 1 comprising a first opening for feeding non-compressive fluid, connected to said adjusted pressure chamber; and a second opening for feeding non-compressive fluid connected to the pressure storing chamber.
Claim 5
Dependent Claim
39 words
A device for automatically adjusting the expansion of a track shoe assembly according to claim 1 wherein a drain plug for removing non-compressive fluid, connected to said adjusted pressure chamber, is provided on the wall of the first cylinder.
Claim 6
Dependent Claim
47 words
A device for automatically adjusting the expansion of the track shoe assembly of a crawler tractor according to claim 1 wherein a bracket is fixed on the bearing for supporting a rotary shaft of the front idler and said bracket is connected to the rod through yoke.
Claim 7
Dependent Claim
54 words
A device for automatically adjusting the expansion of a track shoe assembly of a crawler tractor according to claim 1 wherein said valve means includes a first port connected to said pressure storing chamber and a second port connected to said adjusted pressure chamber wherein said spool means connects and disconnects said two ports.
Claim 8
Dependent Claim
30 words
A device for automatically adjusting the expansion of the track shoe assembly of a crawler tractor according to claim 1 wherein said spring is housed in a spring containing cylinder.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |