Combination lock

A lock assembly comprising:

• a plurality of peripherally gated tumbler wheels supported for rotation about a common axis;
• a peripherally gated control cam rotatable about said common axis;
• a bolt movable between an extended and retracted position;
• a fence lever having a first end rotatably mounted to said bolt and a second end having a fence for engagement with the peripheral gates on said tumbler wheels and a latch for engaging said peripheral control cam gate only when said fence engages said peripheral tumbler wheel gates to provide cam operated movement of said bolt between said extended and retracted positions;
• means for biasing said fence lever second end towards said control cam;
• a housing having a bolt opening through which said bolt is moved between said extended and retracted positions;
• means for precisely positioning said fence lever and bolt when said bolt is moved to said extended position and said latch is disengaged from said control cam gate, said positioning means including:
• a detent extending outward from said fence lever first end having a face for abutting against said housing to position said bolt in said extended position to prevent further extension of said bolt;
• an abutment face on said fence lever second end;
• and
• an abutment shoulder on said housing positioned for contact with said fence lever abutment face when said bolt is in the extended position and said latch is disengaged from said control cam gate to prevent movement of said bolt in a retractive direction when said bolt is in said extended position, said detent, lever abutment face, housing shoulder abutment and lever latch biased against said control cam thereby providing three positioning points to precisely position said bolt in said extended position.

A lock assembly comprising:

• a plurality of peripherally gated tumbler wheels supported for rotation about a common axis;
• a peripherally gated control cam rotatable about said common axis;
• a bolt having a front end and a rear end being movable between an extended and a retracted position;
• a fence lever having a first end rotatably mounted to said bolt and a second end having a fence for engagement with the peripheral gates on said tumbler wheels and a latch for engaging said peripheral control cam gate only when said fence engages said peripheral tumbler wheel gates to provide cam operated movement of said bolt between said extended and retracted positions;
• means for biasing said fence lever second end towards said control cam;
• a housing having a bolt opening through which said bolt is moved between said extended and retracted positions and a removable backplate;
• and
• relock means comprising a V-shaped coplanar relock spring rod having a first end secured to said housing and a second end extendable transversely behind said bolt rear end to a bolt blocking position when said bolt is in said extended position and said backplate is removed to thereby prevent retraction of said bolt, said relock spring second end being compressed out of said bolt blocking position when said backplate is mounted to said housing.