US 4,615,193 AGranted

Combination lock

AssigneeBurg-Wachter KG Alfred Luling

InventorAdalbert Luling

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Abstract

A combination lock has a locking bolt movable in bolt-opening and bolt-closing directions by a bolt-operating knob; a plurality of displaceable locking bars each having a predetermined position dependent upon a set combination; an arrangement for preventing the locking bolt from movement from a fully-closed position unless each locking bar is in its predetermined position; a plurality of displaceable code bars connected to the locking bars; a plurality of displaceable digit slides each having an externally accessible, manually engageable portion, a plurality of digit markings and a lug operatively engaging into the associated code bar; a movable carrier plate traversed by the lugs of the digit slides, whereby the locking bars, the code bars and the digit slides are displaced by the carrier plate during a motion thereof in a direction opposite the direction of movement of the locking bolt during opening. The bolt-operating knob is coupled with the carrier plate for moving the latter in a direction opposite the bolt-opening direction during displacement of the locking bolt in the bolt-opening direction.

Claims18

Dependent claims

A combination lock mounted on a door comprising:

(a) a lock housing;
(b) a locking bolt having a fully-open and a fully-closed position and being supported in said housing for executing displacements in bolt-opening and bolt-closing directions;
(c) a manually operable bolt-operating knob;
(d) drive means for connecting said bolt-operating knob with said locking bolt for displacing said locking bolt in response to operation of said bolt-operating knob;
(e) a plurality of side-by-side arranged displaceable locking bars each having a predetermined position dependent upon a set combination;
(f) means for preventing said locking bolt from movement from said fully-closed position unless each said locking bar is in its predetermined position;
(g) a plurality of displaceable code bars connected to said locking bars;
each said locking bar being associated with a separate said code bar;
(h) a plurality of displaceable digit slides each having an externally accessible, manually engageable portion, a plurality of digit markings and a lug passing through said door and operatively engaging into the associated code bar, whereby manual displacement of any of said digit slides effects displacement of the associated locking bar with the intermediary of the associated code bar;
(i) a movable carrier plate situated in said housing between said door and said code bars and being traversed by said lugs, whereby said locking bars, said code bars and said digit slides are displaced by said carrier plate during a motion thereof in a direction opposite said bolt-opening direction;
and
(j) coupling means for connecting said bolt-operating knob with said carrier plate for moving said carrier plate in a direction opposite said bolt-opening direction during displacement of said locking bolt in said bolt-opening direction.

9 more elements

Dependencies are inferred from the claim text.