Locks – Portable – Padlocks
Patent
1990-10-15
1991-07-02
Gall, Lloyd A.
Locks
Portable
Padlocks
70312, 70318, 70328, 70DIG44, E05B 3702
Patent
active
050276239
ABSTRACT:
A combination lock includes a lock body, having a hollow spindle laterally protruding outwardly, a locking bolt having a plurality of projections formed on the bolt insertably into the hollow spindle adapted for locking the lock, a plurality of dials normally coupled with sleeves rotatably mounted in the lock body having a plurality of annular corrugated teeth formed on an inner ring of each sleeve retarding the withdrawal of the projections of the bolt to prevent a trial opening by touch feeling by an intruder when rotating the dials in order to find out an opening slot formed in the sleeves for withdrawing the locking bolt, a plurality of positioner plates slidably held on the spindle for rotatably clickingly engageable with the sleeves for helping sensing a subsequent dialing operation from numeral to numeral; and a combination-changing plate pre-inserted in the locking bolt for pushing the sleeves inwardly to disengage their coupling with the dials for free rotation of dials for re-setting a new combination.
REFERENCES:
patent: 4383425 (1983-05-01), Orabona
patent: 4441346 (1984-04-01), Castiglioni
patent: 4445348 (1984-05-01), Saitoh
patent: 4610152 (1986-09-01), Duringer
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