Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1975-06-16
1977-09-06
Scott, Samuel
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
74422, F16H 1904
Patent
active
040460193
ABSTRACT:
A locking device for a lift having a base and a lifting platform which may be variably elevated above the base of the lift. The locking device comprises an elongated gear rack secured at one end to the lifting platform of the lift and slidably received within a housing secured to the base of the lift. A first gear, having its axle secured to the housing, is positioned within the housing so that the first gear continually meshes with the gear rack. A second gear is also disposed in the housing and is movable between a first and a second position. In the first position the second gear meshes only with the gear rack thus permitting longitudinal movement of the gear rack whereas in the second position the second gear meshes with both the gear rack and the first gear thus forming a three point gearing system and preventing further longitudinal movement of the gear rack.
REFERENCES:
patent: 1218021 (1917-03-01), Walther
patent: 2502057 (1950-03-01), Mitchell
patent: 3762235 (1973-10-01), Splinter
Ratliff, Jr. Wesley S.
Scott Samuel
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