Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1982-03-22
1985-12-24
Jillions, John M.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
254361, 180271, 414569, 303 13, B66D 108
Patent
active
045601488
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to log skidding vehicles having a winch and winch control member and, more particularly, to a brake system which applies the vehicle's service brakes simultaneously with neutralizing the vehicle's transmission.
BACKGROUND ART
Cable equipped log skidding vehicles are designed for dragging logs with a cable and associated chokers. Such log skidding vehicles have winches for retracting the cable and attached logs toward the vehicle and for unwinding cable from the winch to facilitate choker setting and log attachment. The winch is typically controlled by a winch control lever which the operator moves in a suitable direction to either retract or unwind the cable.
When winching a log bunch to a skidding position (relative to the skidding vehicle), the vehicle operator simultaneously must turn in his seat to view the log bunch rearwardly of the vehicle, operate the winch control lever typically arranged alongside his seat, modulate engine speed to regulate winch speed and force with a governor control device and apply the service brakes of the vehicle to winch against subsequently to shifting the transmission into neutral. While service brake and governor control have each been historically provided by a modulating foot-operated pedal, simultaneous operation of such brake pedal, governor control pedal, and the winch control lever while viewing rearwardly from the vehicle can cause the operator to assume an uncomfortable, contorted position not conducive to any of the operations, but, instead, a compromise among the three. To avoid such discomfort and provide improved operator visibility of the skidded load, operators have sometimes utilized a vehicle parking brake to winch against since it normally locked and, thus, did not require continuous exertion by the operator on the brake pedal. Use of the locking parking brake permitted the operator to devote his entire attention to the skidded load, governor control, and winch control lever. However, the parking brake is normally designed to hold the static load of the vehicle rather than the relatively larger loads imposed on the vehicle by winching the log bunches to their skidding positions. As a result of such unintended use, the parking brake's life was often adversely affected.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention a log skidding vehicle having a transmission is provided with a brake system which is alternately actuatable by a service brake control valve and a winch control lever mounted actuator. The winch control lever mounted actuator, when applied, simultaneously applies the service brakes by actuating a winch brake control valve and neutralizes the transmission. The brake system is arranged to permit independent operation of the service brake control valve and the winch brake control valve.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be more fully understood from the following detailed description of a preferred embodiment, taken in connection with the accompanying drawings, in which:
FIG. 1 is a side elevation view of an exemplary log skidding vehicle; and
FIG. 2 is a schematic illustration of that vehicle's brake system and transmission neutralizer.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring now to FIG. 1, a log skidding vehicle 10 includes ground engaging members such as the illustrated four wheels 12 (only two are shown) and a chassis 14 which has an operator enclosure 16 mounted thereon. On the rear of the chassis 14 is mounted an integral arch-fairlead 17 and a winch 18 which selectively retracts and pays out cable through the fairlead 17 to facilitate its attachment to logs typically through the use of chokers (not shown). A winch control lever 20 is mounted within the operator enclosure 16 and is used to actuate the cable winch 18 to winch logs to an optimal skidding position relative to the vehicle 10.
FIG. 2 is a schematic illustration of the brake system 22 of the vehicle 10. An air compressor 24 supplies pressurized air to a reservoir 26 from which a
REFERENCES:
patent: 1987688 (1935-01-01), Lamp
patent: 2464039 (1949-03-01), Howell
patent: 3091976 (1963-06-01), Johnson et al.
patent: 3380545 (1968-04-01), Kemper
patent: 3444968 (1969-05-01), Golan et al.
patent: 3939937 (1976-02-01), Moberg
patent: 4063624 (1977-12-01), Beck et al.
patent: 4128276 (1978-12-01), Beck
patent: 4257503 (1981-03-01), Lutnick
patent: 4293164 (1981-10-01), Hoefer
Caterpillar Tractor Co.
Jillions John M.
Keen Joseph W.
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