Ramps

Details Ramps Ramps

1979-03-23

1981-06-23

Sheridan, Robert G.

Bridges

Gangway, ramp, or dock leveler

414537, E01D 100

Patent

active

042741726

ABSTRACT:
A platform and ramp apparatus comprises a ramp and structure for securing the ramp to the platform. The securing means comprises link structure rotatably mounted on the platform to rotate about a first axis of rotation fixed relative to the platform, the ramp being rotatably mounted on the linkage to rotate about a second axis of rotation parallel to the first axis of rotation. Engagement structure is provided on the platform and on the ramp respectively, which engagement structure is capable of retaining the ramp in two alternative positions relative to the platform. These are a first ramp position in which the ramp provides a surface sloping downwardly from the platform and a second ramp position in which the ramp provides a surface sloping upwardly from the platform to form a barrier. Rotation of the linkage about the first axis of rotation allows disengagement of the engagement structure whereby the ramp may be moved between the first and second ramp positions.

REFERENCES:
patent: 3138272 (1964-06-01), Flowers
patent: 3369679 (1968-02-01), Robinson

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