Motor vehicles – Special wheel base – Five or more wheels
Patent
1977-07-08
1978-07-25
Betts, Kenneth H.
Motor vehicles
Special wheel base
Five or more wheels
280 4318, 280 4323, 280704, B62D 6112
Patent
active
041024249
ABSTRACT:
A tag wheel lift includes first and second brackets, spaced longitudinally and provided with inner and outer legs, with the former being attached to a mounting plate by spacing blocks which provide clearance for nuts for pivot bolts which extend through the legs. One end of a leaf spring for the corresponding tag wheel is pivoted on a bolt or pin extending between the lower ends of the legs of the first bracket, while the other end of the spring is pivoted between a pair of lower links, at the lower rear corner of a rearward offset. A hydraulic cylinder is pivoted on the first bracket, while the piston rod thereof is pivoted between the movable ends of a pair of upper links, on the same pivot which connects the upper links with the lower links. The upper ends of the upper links are pivoted between the inner and outer legs of the second bracket, with the outer leg being restricted in length to provide clearance for upward movement of the lower links to folded or retracted position, with the rearwardly extending offset moving past the outer leg of the second bracket. This moves the corresponding end of the tag wheel spring to a higher position, to place the corresponding wheel a sufficient distance above the road. In extended position, the links are essentially in line, to cause the tag wheel to engage the rod beneath. A tag wheel lift is mounted on each side of the chassis and the two are retracted and extended simultaneously, through appropriate controls.
REFERENCES:
patent: 2774606 (1956-12-01), Burweger
patent: 3195917 (1965-07-01), Baldock
patent: 3243193 (1966-03-01), Fulmer et al.
patent: 3285621 (1966-11-01), Turner
patent: 3384384 (1968-05-01), Diehl
patent: 3533641 (1970-10-01), Driskill
patent: 3659671 (1972-05-01), Heinze
patent: 3831210 (1974-08-01), Ow
patent: 3856319 (1974-12-01), Hardy
patent: 3915470 (1975-10-01), Jansen
Betts Kenneth H.
Crandell Ralph F.
Hydraulics Unlimited Manufacturing Co.
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