Door system for large primate caging

Details Door system for large primate caging Door system for large primate caging

1988-12-07

1990-09-04

Hirsch, Paul J.

Animal husbandry

Milkers

With signals, indicators, registers, and timers

49360, A01K 100, A01K 108

Patent

active

049535005

ABSTRACT:
A door system for an opening separating two areas that contain a primate with the primate being able to control by switches connected to the operating system for opening and closing the door to dictate his ingress and egress between the areas. The caretaker can override the switches controlled by the primate. A hydraulically driven piston, operable through a fluid control cylinder containing a spool valve, raises and lowers the door to close and open the opening. Fluid exhausted from the system by the movements of the piston is discharged upon the floor of one of the areas to keep it clean.

REFERENCES:
patent: 1041851 (1912-10-01), Niemann
patent: 3802123 (1974-04-01), Frey et al.
patent: 3802126 (1974-04-01), Markus
patent: 3821865 (1974-07-01), Steinke
patent: 3921335 (1975-11-01), Hewitt et al.
patent: 3938282 (1976-02-01), Goyal
patent: 4296570 (1981-10-01), Balbach et al.
patent: 4322913 (1982-04-01), Himmer
patent: 4476678 (1984-10-01), Hall
patent: 4794879 (1989-01-01), Thom et al.

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