Animal husbandry – Waste toilet or related device – Walled receptacle; e.g. – litter box – etc. – containing...
Patent
1977-07-11
1979-12-11
Chamblee, Hugh R.
Animal husbandry
Waste toilet or related device
Walled receptacle; e.g., litter box, etc., containing...
A61D 300
Patent
active
041777646
ABSTRACT:
This invention relates to clamps for attachment to the legs of animals, especially sheep, and among other things may be used for suspending the animals by their four legs for shearing and other treatment operations.
A clamp according to the invention comprises two pivotally connected clamp members between which the leg is clamped. The clamp is normally maintained in its open condition by at least one return spring, and is closed, in opposition to the spring or springs, by means actuated by a fluid under pressure.
Preferably the clamp, is normally locked or retained in its open condition so that it cannot be closed by the said fluid pressure means until it is released by operation of an actuating member.
One of the said clamp members is preferably fixed to a clamp carrier member, in which case the other or pivoted clamp member is opened and closed by the said spring and fluid pressure means respectively.
The said fluid pressure means preferably comprises a cylinder fitted with a slidable plunger and means for transmitting projecting movements of the plunger to the pivoted clamp member. When the pivoted clamp member is fully open, the line of action of the force transmitted thereto by the plunger preferably passes through or close to its pivotal axis, so that the closing torque, if any, thus transmitted to the pivoted clamp member is insufficient to overcome the opposing action of the return spring, while the said actuating member preferably imparts an initial closing movement to the pivoted clamp member.
The said cylinder is preferably connected by a tube to a master cylinder fitted with a spring-loaded piston by which the hydraulic fluid is normally maintained under pressure and means are provided for retracting the piston in order to relieve the pressure on the fluid and thus permit the clamp, when closed, to be re-opened by the return spring.
REFERENCES:
patent: 941543 (1909-11-01), Sistek et al.
patent: 1112867 (1914-10-01), Taylor et al.
patent: 2829622 (1958-04-01), Borthwick
patent: 3215120 (1965-11-01), Geary
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