Apparatus and method for maintaining positional alignment betwee

Details Apparatus and method for maintaining positional alignment betwee Apparatus and method for maintaining positional alignment betwee

1980-07-03

1982-10-19

Nase, Jeffrey V.

Conveyors: power-driven

Conveyor section

Endless conveyor

91171, 226 21, 474104, B65G 3916, F15B 1122

Patent

active

043545955

ABSTRACT:
The invention relates to a method and apparatus for maintaining relative positional alignment between two spaced-apart points on a moveable member, such as a rotating axle on which is mounted a conveyor belt pulley. The invention comprises a hydraulic pump (80) which is operatively communicated to first and second hydraulic cylinders (21and 30, respectively). The first hydraulic cylinder (21) applies a reference hydraulic pressure to a first point (13) on the axle (11) and moves the axle (11) to maintain the pressure at a constant, pre-determined pressure level. The second hydraulic cylinder (30) is operatively connected to a second point (12) on the axle (11) spaced apart from the first point (13). A fork (77) and pin (42) mechanism senses relative movement between the first point (13) and the second point (12) on the axle (11). A hydraulic servo-valve (60) directs hydraulic fluid to the second hydraulic cylinder (30) for moving the axle (11) at its second point (12) in a direction and for a distance corresponding to the movement of the axle (11) at the first point (13).

REFERENCES:
patent: 2602298 (1952-07-01), Ashton et al.
patent: 2761285 (1956-09-01), Beecroft
patent: 2764869 (1956-10-01), Scherr
patent: 2914957 (1959-12-01), Johnson
patent: 2932171 (1960-04-01), Ranson
patent: 3159268 (1964-12-01), Dyke
patent: 3489264 (1970-01-01), Begiebing
patent: 3603451 (1971-09-01), Promin et al.
patent: 4173904 (1979-11-01), Repetto

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