Key-removable lock core
AssigneeJaNaKa Limited Partnership
InventorRodrick A. HERDMAN
Life of this patent
Estimating the term…
Abstract
A key-removable lock core that is retained in a core receptacle by a retaining lug, and which can operated by an operating key to align the pins of the pin chambers for shear at the operating shear line, and to allow the key plug to be rotated, and which employs a control tool with the operating key for manipulating the pins into alignment for shear at the control shear line, to allow the sleeve and the key plug together to be rotated, to move the retaining lug on the sleeve between a projected position in which the lug is engaged behind a rearward-facing shoulder in the core receptacle to retain the core in the receptacle, and a retracted position within the profile of the core.
Claims3
A key-removable lock core comprising:
- a) a sleeve comprising a lower cylindrical barrel portion having a longitudinally arranged tubular bore, an upper extension having a plurality of spaced-apart radially-arranged operating pin bores, and a retaining lug extending from the sleeve;
- b) a housing having (i) a lower body portion having a longitudinally-arranged tubular bore for receiving the barrel portion of the sleeve, (ii) an upper body portion having a longitudinally-arranged retaining chamber for receiving the upper extension and retaining lug of the sleeve, and a plurality of radially-arranged control pin bores extending to the tubular bore to define a control shear line, and (iii) a retaining slot to accommodate tangential movement there through of the retaining lug;
- c) a cylindrical key plug rotatable between a key insertion position and a control position, within the tubular bore of the sleeve, and having a cylindrical periphery, a longitudinally-arranged keyway, a plurality of radially-arranged tumbler bores that extend from the keyway to the periphery, to define an operating shear line, the key plug further having at least one control cavity displaced radially from at least one of the tumbler bores, and a control channel intersecting a portion of the at least one control cavity;
- d) a plurality of tumbler pins disposed for axial movement within the plurality of tumbler bores;
- e) a plurality of operating pins disposed for axial movement within the plurality of operating pin bores;
- f) a plurality of control pins disposed for axial movement within the plurality of control pin bores;
- g) at least one auxiliary control pin disposed in the at least one control cavity;
- and
- h) a control tooling configured for manipulation within the control channel to intersect the at least one control cavity, for biasing the at least one auxiliary control pin out of the at least one control cavity at least partially into an associated tubular bore in the sleeve when the key plug is disposed in the sleeve in the control position.
In a key-removable lock core, a cylindrical key plug that further has at least one control cavity disposed in the periphery, displaced radially from one of the tumbler chambers, a control channel intersecting at least a portion of the control cavity, an auxiliary control pin disposed in the control cavity, and biased outwardly from the opening of the control cavity in response to manipulation of the control tool in the control channel to intersect the control cavity.
A key-removable lock core having a retaining lug that retains the lock core in a core receptacle, and is moveable between a projected position in which the lug is engaged behind a rearward-facing shoulder in the core receptacle to retain the core in the receptacle, and a retracted position within the profile of the core, the lock being operable by an operating key that aligns the pins of the pin chambers for shear at an operating shear line to allow the key plug to be rotated, the operating key being used with a control tool for manipulating the pins into alignment for shear at the control shear line, to allow the sleeve and the key plug together to be rotated, to move the retaining lug out of engagement with the core receptacle and to withdraw the key-removable lock core from the core receptacle.
Dependencies are inferred from the claim text.