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US 4,647,089 AGranted
Dead bolt lock operable by pressurized fluid
AssigneeThe United States of America as represented by the Secretary of the Army
InventorRoy A. Zangrando
Life of this patent
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Abstract
A bolt of a dead bolt lock is moveable between a locking position and an ocking position by application of a pressurized fluid. In both the locking and unlocking positions a plurality of locking balls are urged into locking engagement with a locking groove and are maintained in such locking engagement by a resiliently urged locking cam without the necessity for maintaining the pressurized fluid once the required condition is attained. Application of the pressurized fluid unlocks the bolt, displaces it to its alternate position and locks it in place.
Claims4
A dead bolt lock comprising:
- a barrel;
- a bolt slidable within said barrel between a locking position and an unlocking position;
- actuating means responsive to application of a pressurized fluid for selectively displacing said bolt between said locking and said unlocking positions;
- at least one locking groove in a surface of said barrel adjacent said bolt;
- a cavity in said bolt;
- at least one radial hole from said cavity to a surface of said bolt adjacent a surface of said barrel;
- a locking ball in said at least one radial hole;
- said at least one radial hole being aligned with said at least one locking groove in at least one of said locking and said unlocking positions;
- cam means for urging said locking ball into engagement with said locking groove whereby said bolt is locked in one of its locking and unlocking positions, said cam means including a rod displaceable within said cavity by said actuating means and at least one lock cam slideably disposed on said rod, said at least one lock cam including a small diameter portion, a large diameter portion and a ramp portion joining said large and small diameter portions, said actuating means including means for disposing said small diameter portion adjacent said locking ball during said displacing and for disposing said large diameter portion adjacent said locking ball in one of said locking and unlocking positions, said large diameter portion being effective to maintain said locking ball in said locking groove;
- and
- resilient means for maintaining said cam means in a position maintaining said engagement without requiring additional application of said pressurized fluid.
8 more elements
A dead bolt lock comprising:
- a generally cylindrical barrel;
- a generally cylindrical bolt slideable within said barrel between a locking and an unlocking position;
- a generally cylindrical cavity within said bolt;
- first and second locking grooves axially spaced a first predetermined distance apart in an inner surface of said cylindrical barrel adjacent said bolt;
- first and second radial holes between said cavity and a surface of said bolt adjacent said cylindrical barrel, said first and second radial holes being axially spaced a second predetermined distance apart;
- a first locking ball in said first radial hole;
- a second locking ball in said second radial hole;
- a rod in said cavity displaceable by pressurized fluid means between a locking and an unlocking position;
- a locking lock cam on said rod;
- an unlocking lock cam on said rod;
- resilient means effective for biasing said locking lock cam and said unlocking lock cam apart on said rod;
- said locking lock cam and said unlocking lock cam each having a large diameter portion adjacent each other, a small diameter portion at opposed ends thereof and a ramp portion joining said large and small diameter portions;
- said large diameter portion being effective, when aligned with its respective locking ball, to hold its respective locking ball engaged in a locking groove and to prevent relative motion between said barrel and said bolt;
- said small diameter portion being effective, when aligned with its respective locking ball, to permit said respective locking ball to move radially out of engagement with a locking groove and to thereby permit displacement of said bolt to its alternate position;
- means on said rod for selectively disposing a desired one of said large and small diameter portions of a selectable one of said locking lock cam and said unlocking lock cam adjacent its respective locking ball whereby locking and unlocking of said bolt in its locking and unlocking positions is performed;
- and
- said means on said rod further including means for displacing said bolt between its locking and unlocking positions.
14 more elements
Dependencies are inferred from the claim text.