Changeable rotary combination shackle lock

Abstract

A shackle leg changeable combination lock including clutches and combination wheels slidable to position therein for positive engagement in which the combination wheels are axially restrained in position by a removable cap held by a detent means. The cap is removable when a shackle leg is moved upwardly to an unlock position and the cap detent means is overcome by application of force.

Description

BACKGROUND OF THE INVENTION

Cable or chain combination locks of the type having means for setting or changing the combination have been known (U.S. Pat. Nos. 4,445,348 and 4,615,191). Other combination locks have included mechanisms described in U.S. Pat. Nos. 1,706,994; 1,898,947; 4,354,365; 4,441,346; and 4,831,860.

SUMMARY OF THE INVENTION

Broadly, the present invention includes a shackle combination lock that is readily partially disassembled when the shackle is pulled to the open position to permit change of the combination. A cap end is removable by causing the depression of a spring-loaded clasp permitting the combination wheels to be removed from the clutches and replaced in a selected position to attain the desired new combination.

It is a feature of the lock that the removable cap is securely held by the lock shackle in the lock position and readily removable when the shackle is in the unlock position.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view of selected parts of the lock;

FIG. 1A is also an exploded perspective view of certain parts of the lock;

FIG. 2 is a partial elevational sectional view of the lock;

FIG. 3 is a sectional view along line 3--3 of FIG. 2;

FIG. 4 is a sectional view along line 4--4 of FIG. 2;

FIG. is a selected view along line 5--5 of FIG. 2; and

FIG. 6 is bottom perspective of the lock cap.

DESCRIPTION OF THE PREFERRED EMBODIMENT

In FIGS. 1 and 1A, lock 10 includes fixed body portion 8, removable cap end 9, lock shaft body 11, lock shaft 12, clutches 13a-d and, combination wheels 16a-d, and U-shaped shackle 15 with shackle legs 15a, 15b. Shaft body 11 includes shaft portion 11a having both holes 25a-d and head 11b. Lock shaft body 11 is permanently fixed to body portion 8 using a pin or other suitable means.

Fixed body portion 8 in turn includes shackle sleeve opening 17, shackle leg retaining pin 18 and shaft body recess 19 (FIG. 2). Removable end cap 9 has shackle cap recess 9a and lock shaft body head 11b includes shaft recess sleeve 22 aligned to receive leg 15b. Cap a also has recess 23 to house head 11b.

Removable end cap 9 is held in lock position by shackle leg 15b; however, when leg 15b is moved out of head 11b and cap 9, cap 9 is readily removable by the exertion of force to cause cap 9 to be urged away from shaft body head 11b causing spring 26 to move out of lock cap cavity 27 into head dwell recess 29.

Lock 10 further includes locking mechanism 30 in which shaft 12, housed in shaft body recess 19 of shaft body portion 11a, is urged to the right (FIG. 2) by coil spring 34 causing large shackle lock ball 36 to engage shackle notch 37 of shackle leg 15b. Shaft 12 includes four (4) annular shackle depressions 12a-d for accommodating small shaft lock balls 38a-d. Lock balls 38a-d are captured in depression 12a-d and restrained by clutches 13a-d. Each clutch 13a-d includes a ball clutch pocket 44a-d which permits shaft lock balls 38a-d to be moved out of shaft grooves 12a-d to permit spring 34 to be compressed as shackle leg 15b is pulled upwardly camming ball 36 to the left (see arrow in FIG. 2) to unlock the lock. FIG. 2 shows the clutches 13a-d positioned with clutches 13a-c in positions in which balls 38a-c can not move upwardly out of grooves 12a- c while clutch 13d is turned so that clutch pocket 44d permits ball 38d to move upwardly upon laterally movement of shaft 12. Clutches 13a-d are moved to selected positions by combination wheels 16a-b which are engageable as clutch projections 47a-d enter wheel recesses 48. Clutches 16a-d also carry thumb pieces 51a-d.

Once the combination wheels 16a-d are aligned to permit balls 38a-d to be moved upwardly, a pull on shackle 15 causes shackle leg 51a to move upwardly camming ball 36 to the left (FIG. 2) to release leg 15b. As leg 15b is moved upwardly out of cap recess 9a and head recess 22, cap end 9 is free to be disassembled by applying sufficient force to cause spring 27 to move into dwell recess 29 and release cap 9.

Once cap end 9 is removed, combination wheels 16a-d can be removed laterally and replaced with each of the sets of projections 47a-d moved into a number of wheel recesses 48 on clutches 13a-d to create a new combination.

Claims

1. A changeable combination U-shaped shackle lock in which the shackle has two legs and further has clutches and combination wheels comprising

a) a fixed body having a shaft means for receiving and holding a first shackle leg in the fixed body for limited movement therein and said fixed body including a head means sized and proportioned to permit the combination wheels to be placed around and removed from the shaft means and said fixed body having a recess sleeve receiving a second shackle leg;

b) the shaft means having a hollow shaft recess extending therethrough;

c) a reciprocal shaft positioned in the hollow shaft recess, which shaft is normally urged toward the second leg located in the head means;

d) a ball between the reciprocal shaft and second leg to lock the second leg;

e) a removable spring-loaded cap positionable on the head means which cap is sized and proportioned to prevent removal of the combination wheels from the shaft means and includes a recess opening substantially perpendicular to the path of reciprocation of the shaft means, such opening for receiving the second leg which recess opening is aligned with the recess sleeve; such cap upon removal allowing removal of the combination wheels; and

f) spring-loaded detent means for holding the cap on the head means after the lock is in its unlock position with the second leg removed from the head means and the cap;

whereby the head means, cap and second leg engage when the lock is locked and second leg and cap do not engage when the lock is unlocked permitting cap removal only upon activation of the detent means following shackle unlocking.

2. The lock of claim 1 in which the shaft has grooves, the shaft means includes holes and the clutches have pockets, all for accommodating lock balls.