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Title: Double changeable key lock for safe deposit boxes and the like
Claims: What is claimed is: 1. A lock requiring two different keys for operation of the lock to unlocking position, comprising a lock housing, a slide bolt mounted in the housing for sliding movement between projected and retracted positions, a aplurality of gate members each having a gating recess, means mounting said gate members in said housing for movement with said slide bolt, first and second rotatable key plugs at first and second key stations in said housing spaced apart along the direction of bolt movement, a first set of a plurality of renter key tumbler levers to be positioned by a renter key in the first key plug, means for mounting said renter key tumbler levers in said housing positioning them normally in interfering relation to a first set of said gate members and mounting said renter key tumbler levers for movement under operation of said renter key in said lock to a noninterfering position, a second set of a plurality of guard key tumbler levers to be positioned by a guard key in said second key plug, means for mounting the guard key tumbler levers in said housing positioning them normally in interfering relation to a second set of said gate members and mounting them for movement under operation of said guard key in said second key plug to a non-interfering position, both sets of said tumbler levers having portions disposed to engage said gate members and prevent movement of said slide bolt to unlocking position until both said renter key and said guard key have been inserted in said lock and are positioned to concurrently hold said two sets of tumbler levers in said non-interfering position relative to said two sets of gate means whereby the gate members are then released to permit retraction of said bolt to unlocking position, said bolt including gate locator means having a projection to be interfitted in holding relation with an edge of each of said gate members and movable between a gate-holding and gate-releasing position, and a gate release cam accessible from externally of the lock housing when the bolt is in a preselected intermediate position to be manipulated for shifting said gate locator means between gate-holding and gate-releasing positions. 2. A lock as defined in claim 1, wherein said means for mounting said gate members includes means for releasing both said first and second sets of said gate members from said bolt to enable their positions to be changed relative to said bolt and relative to the profile of the keys required to aline said gate members and tumbler levers in non-interfering positions, whereby either or both of the keys required to operate the lock may be changed. 3. A lock as defined in claim 1, wherein said gate members include gate openings facing toward said tumbler levers having inwardly divergent side edges, said tumbler levers having fence projections adapted to interfit into said gate openings having outwardly divergent side edges, said gate members being releasable from said bolt to assume different positions relative to said tumbler levers, and said gate members being movable arcuately by said tumbler levers when released from said bolt to enable changing of the first and second keys required to open said lock. 4. A lock as defined in claim 1, wherein said first and second sets of tumber levers are pivotally mounted on a common axis in said housing between said key stations. 5. A lock as defined in claim 4, wherein said guard key tumbler levers each have an opening encircling said first key plug of sufficient size to maintain the associated guard key tumbler levers free of any contact with the renter key in said first key plug. 6. A lock as defined in claim 5, wherein said tumbler lever axis and said key-receiving rotatable plugs are located substantially in line with each other along a common mid-plane of said lock. 7. A lock as defined in claim 1, wherein at least some of said tumbler levers are substantially symmetrical about a midplane through the tumbler lever to facilitate their assembly into the lock. 8. A lock as defined in claim 1, wherein at least some of said tumbler levers include key follower surfaces to be engaged by the associated key, which are formed on interior surfaces of apertures formed in said tumbler levers. 9. A lock as defined in claim 1, wherein said gate release cam is rotatable and is carried by said bolt and intercoupled with said gate locator means for shifting the same between said gate-holding and gate-releasing position, said gate release cam being alinable with an opening in said housing when said bolt is in a preselected intermediate position between said projected and retracted positions for insertion of a tool to shift the gate release cam between positions disposing said gate locator means at said gate-holding and gate release positions. 10. A multiple key lock for safe deposit boxes and the like comprising a lock housing, a bolt slidably supported in said housing for movement between a projected locking position and a retracted unlocking position, a plurality of platelike gate members releasably carried by said bolt to prevent movement of the bolt from said locking position toward unlocking position until a plurality of mating tumbler levers operated by a renter's key and a guard key are alined in selected relation to each of the gate members, the improvement permitting changing of both the renter's key and the guard key for opening the lock comprising a first set of plurality of renter's key tumbler levers pivotally mounted adjacent one end on a common pivot axis and having first key follower surfaces on each tumbler lever thereof to be engaged by a renter's key insertable in said lock at a renter's key station, the lock having renter's key-receiving means spaced laterally of said common pivot axis and located adjacent said key follower surfaces, and a second set of a plurality of guard key tumbler levers pivotally mounted on said common pivot axis and having second key follower surfaces on each said guard key tumbler lever to be engaged by a guard key insertable in said lock at a guard key station spaced from said renter's key station, the lock having guard key-receiving means spaced laterally of said common pivot axis oppositely disposed relative to the renter's key receiving means, whereby adjustment of the gate members carried by said bolt relative to each of the two sets of tumbler levers permits changing of the customer and guard keys, said bolt including gate locator means having a projection to be interfitted in holding relation with an edge of each of said gate members and movable between a gate-holding and gate-releasing position, and a gate release cam accessible from externally of the lock housing when the bolt is in a preselected intermediate position to be manipulated for shifting said gate locator means between gate-holding and gate-releasing positions. 11. A multiple key lock as defined in claim 10, wherein said tumbler levers are each symmetrical about a mid-plane of the tumbler lever extending through common pivot axis and said key follower surfaces are formed on inner edges of apertures extending through the tumbler levers. 12. A multiple key lock as defined in claim 11, wherein said renter's key-receiving means and said guard key-receiving means and said common pivot axis are all substantially alined along a mid-plane of said lock. 13. A multiple key lock as defined in claim 10, wherein said tumbler levers are normally disposed in interfering relation to said gate members along the direction of movement of the gate members with the slide bolt from locking to unlocking position and wherein said tumbler levers are shaped and positioned to occupy non-interfering relation to movement of said tumbler levers and bolt from locking position to unlocking position only when the renter's tumbler levers are displaced by contact with the proper renter's key with said key follower surfaces and said guard tumbler levers are displaced by contact of their associated key follower surfaces with a proper guard key. 14. A multiple key lock as defined in claim 10, wherein said gate members have gated edges confronting said tumblers and a plurality of teeth along an edge thereof opposite the gated edges of said gate members, and said gate locator means is a slide member having a holding tooth insertable into interleaving relation between teeth of said gate members when said gate release cam is in a predetermined position to hold the gate members in positions corresponding to the configuration of renter's and guard keys for which the lock is set. 15. A multiple key lock as defined in claim 13, wherein said gate members have gated edges confronting said tumblers and a plurality of teeth along an edge thereof opposite the gated edges of said gate members, and said gate locator means is a slide member having a holding tooth insertable into interleaving relation between teeth of said gate members when said gate release cam is in a predetermined position to hold the gate members in positions corresponding to the configuration of renter's and guard keys for which the lock is set. 16. A lock requiring two different keys for operation of the lock to unlocking position, comprising a lock housing, a slide bolt mounted in the housing for sliding movement between projected and retracted positions, a plurality of gate members each having a gating recess, means mounting said gate members in said housing for movement with said slide bolt, a first set of a plurality of tumbler levers to be positioned by a first key, means for mounting said tumbler levers of said first set in said housing positioning them normally in interfering relation to a first set of said gate members and mounting said tumbler levers for movement under operation of said first key in said lock to a non-interfering position, a second set of a plurality of tumbler levers to be positioned by a second key, means for mounting the tumbler levers of said second set in said housing positioning them normally in interfering relation to a second set of said gate members and mounting them for movement under operation of said second key in said lock to a non-interfering position, said tumbler levers having portions disposed to engage said gate members and prevent movement of said slide bolt to unlocking position until both said first and second keys have been inserted in said lock and are positioned to concurrently hold said two sets of tumbler levers in said non-interfering position relative to said two sets of gate means whereby the gate members are then released to permit retraction of said bolt to unlocking position, said bolt including gate locator means having a projection to be interfitted in holding relation with an edge of each of said gate members and movable between a gate-holding and gate-releasing position, and a rotatable gate release cam carried by said bolt and intercoupled with said gate locator means for shifting the same between gate-holding and gate-releasing position, said gate release cam being alinable with an opening in said housing when said bolt is in a predetermined intermediate position between said projected and retracted positions for insertion of a tool to shift the gate release cam between positions disposing said gate locator means at gate-holding and gate release positions. 17. A multiple key lock as defined in claim 16, wherein said gate members have gated edges confronting said tumblers and a plurality of teeth along an edge thereof opposite the gated edges of said gate members, and said gate locator means is a slide member having a holding tooth insertable into interleaving relation between teeth of said gate members when said gate release cam is in a predetermined position to hold the gate members in positions corresponding to the configuration of renter's and guard keys for which the lock is set. 18. A multiple key lock for safe deposit boxes and the like comprising a lock housing, a bolt slidably supported in said housing for movement between a projected locking position and a retracted unlocking position, a plurality of platelike gate members releasably carried by said bolt to prevent movement of the bolt from said locking position toward unlocking position until a plurality of mating tumbler levers operated by a renter's key and a guard key are alined in selected relation to each of the gate members, the improvement permitting changing of both the renter's key and the guard key for opening the lock comprising a first set of a plurality of renter's key tumbler levers pivotally mounted adjacent one end on a common pivot axis and having first key follower surfaces on each tumbler lever thereof to be engaged by a renter's key insertable in said lock, the lock having renter's key-receiving means spaced laterally of said common pivot axis and located adjacent said key follower surfaces, and a second set of a plurality of guard key tumbler levers pivotally mounted on said common pivot axis and having second key follower surfaces on each said guard key tumbler lever to be engaged by a guard key insertable in said lock, the lock having guard key-receiving means spaced laterally of said common pivot axis oppositely disposed relative to the renter's key receiving means, whereby adjustment of the gate members carried by said bolt relative to each of the two sets of tumbler levers permits changing of the customer and guard keys, said bolt including gate locator means having a projection to be interfitted in holding relation with an edge of each of said gate members and movable between a gate-holding and gate-releasing position, and a rotatable gate release cam carried by said bolt and intercoupled with said bolt locator means for shifting the same between gate-holding and gate-releasing position, said gate release cam being alinable with an opening in said housing when said bolt is in a predetermined intermediate position between said projected and retracted positions for insertion of a tool to shift the gate release cam between positions disposing said gate locator means at gate-holding and gate release positions. 19. A multiple key lock as defined in claim 18, wherein said gate members have gated edges confronting said tumblers and a plurality of teeth along an edge thereof opposite the gated edges of said gate members, and said gate locator means is a slide member having a holding tooth insertable into interleaving relation between teeth of said gate members when said gate release cam is in a predetermined position to hold the gate members in positions corresponding to the configuration of renter's and guard keys for which the lock is set. Other info: Inventors: Phillips, Peter J. (Redando Beach, CA, US) Application Number: 517399 Filing Date: 1974-10-23 Publication_date: 1976-10-05 Assignee: Sargent & Greenleaf, Inc. (Rochester, NY) Primary Class(es): 70/339 70/383 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Frazier, Roy D. Assistant Examiner: Holko, Thomas J. Attorney: Mason, Fenwick & Lawrence |
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