Wheel substitutes for land vehicles – Combined or convertible
Patent
1975-01-02
1976-09-14
Wood, Jr., M. H.
Wheel substitutes for land vehicles
Combined or convertible
305 22, B62D 5530
Patent
active
039803511
ABSTRACT:
A track idler recoil assembly is mounted on a crawler tractor for resiliently resisting longitudinal movement of a yoke-mounted track idler caused by track deflection. The assembly comprises a spring housing, open at one end and closed at the other, rigidly secured to the tractor track frame; a coiled compression type recoil spring within the spring housing; and means, including a pushrod and a hydraulic ram, to transmit force between the track idler yoke and the spring and to enable installation and removal of the spring in uncompressed condition. The pushrod is detachably connected to the idler yoke and extends through a hole in a rigid portion of the track frame. The hydraulic ram is located between the pushrod and the spring and is slideably supported in a tubular spring restraining member which is mounted on the spring housing and movable axially into the open end thereof to fixed position to hold the spring in a precompressed condition.
During installation, the uncompressed spring is located in the housing and the ram is disposed on the restraining member between the spring and the rigid portion of the track frame. The ram is then extended to precompress the spring and the spring restraining member is moved axially into engagement with the precompressed spring and is secured in a fixed position to hold the spring in precompressed condition. The ram is then retracted and the pushrod is secured to the idler yoke, whereupon the ram is again re-extended to engage the pushrod and the spring to serve as an incompressible link for transmission of force.
During removal, the ram is retracted, the pushrod is removed, the ram is re-extended between the spring and the rigid portion of the track frame to hold the spring precompressed, while the spring restraining member is moved axially out of engagement with the spring, and the ram is then retracted to decompress the spring.
REFERENCES:
patent: 2717813 (1965-09-01), Gardner
patent: 3539229 (1970-11-01), Scully
patent: 3574418 (1971-04-01), Okabe
patent: 3792910 (1974-02-01), Kaufman
patent: 3829172 (1974-08-01), Oestmann
patent: 3841715 (1974-10-01), Comer
Danner Bill A.
Orr Bobby J.
Schaffner Donald L.
Brown Robert A.
Carroll John A.
Fiat-Allis Construction Machinery, Inc.
Kirby Thomas F.
Wood, Jr. M. H.
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