Patent ID: 7628047

Claim:
A compound lock comprising a common housing comprising an outer housing having a front; a rear; an inner surface; a front edge being formed on the front of the outer housing; a cover being formed on the rear of the outer housing; an extension tube being formed coaxially on and protruding longitudinally from the cover and having an outer surface; an end surface; and a thread being formed on the outer surface; a central hole being formed through the extension tube and the cover; and at least one notch being formed in the inner surface of the outer housing at the front edge; an inner housing being cylindrical, being mounted coaxially in the outer housing and having a front surface; a rear surface; a supplementary lock hole being formed coaxially through the inner housing; and at least one combination assembly recess being formed on the front surface of the inner housing; and a cap being mounted around the outer housing, being fastened to the inner housing and having an open rear end; a closed front end having an inner surface; at least one wheel hole; and a supplementary lock hole corresponding to the supplementary lock hole of the inner housing; and a sidewall; a latch assembly being connected to the common housing and having a core bracket being cylindrical, being connected to the rear surface of the inner housing and having a front end; a rear end; and a slot being formed axially on the front end of the core bracket, communicating with the supplementary lock hole of the inner housing and engaging the drive shaft of the supplementary lock; a mounting collar being mounted rotatably around the core bracket, fastening to the rear surface of the inner housing and having a mounting hole being formed through the mounting collar and being mounted around the core bracket; and a latch being connected to the rear end of the core bracket and having a proximal end being connected to the rear end of the core bracket; a supplementary lock being mounted in the supplementary lock hole of the inner housing, connecting to the core bracket and having a rear surface; a front surface; and a drive shaft being formed on and protruding coaxially from the rear surface of the supplementary lock; and a combination lock being mounted in the inner housing, selectively connecting to the outer housing or disconnecting from the outer housing and having at least one combination assembly being rotatably mounted respectively in the at least one combination assembly recess of the front surface of the inner housing, protruding respectively through the wheel holes in the closed front end of the cap and having at least one unique combination number; and at least one combination notch corresponding to the unique combination number.