Hydraulic elevator apparatus

Details Hydraulic elevator apparatus Hydraulic elevator apparatus

1975-11-20

1977-08-16

Love, John J.

Expansible chamber devices

With cushioning means effective over a portion only of stroke

92 85B, 187 17, F01B 1102, B66B 1104

Patent

active

040418456

ABSTRACT:
Hydraulic elevator apparatus including a cylinder and a fluid actuated plunger which supports an elevator car. A cylinder head seals against fluid leakage to the outside, and it guides the plunger as it moves relative to the cylinder. The cylinder head includes a travel limit structure for the plunger which generates a hydraulic retarding force programmed by a resilient device which adjusts the hydraulic retarding force during a travel limit stop. The resilient device also adds its own retarding force to the plunger, to smoothly decelerate and stop the plunger with minimal impact forces on the cylinder head.

REFERENCES:
patent: 244092 (1881-07-01), Thayer
patent: 531792 (1895-01-01), Forslund et al.
patent: 559526 (1896-05-01), Heermans
patent: 564620 (1896-07-01), Johnson
patent: 963905 (1910-07-01), Larsson
patent: 1081690 (1913-12-01), Morton
patent: 1831136 (1931-11-01), Reed
patent: 2998288 (1961-08-01), Newhouse
patent: 3067726 (1962-12-01), Williams
patent: 3267815 (1966-08-01), Ortman et al.
patent: 3905278 (1975-09-01), Ourdouillie

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