Patent GB-815618-A (GB)
Title: A padlock retainer and padlock equipped with a retainer
IPC: E05B67/24
Filed: 1956-07-23
Abstract: 815,618. Padlocks; barrel locks. SWANSON, G. E. July 23, 1956, No. 22726/56. Class 44 A padlock retainer 76, Fig. 2, to prevent the shackle 18 of a padlock from being extended from the padlock body 10 beyond a predetermined position, comprises a sheet-like member having in cross-section two flat side sections 78, Fig. 7, lying in substantially the same plane and having a bowed central section 80 projecting from said plane, two slots 82 extending from one end of the member 76 and separating the end portions of the side sections 78 from the adjacent end portion of the central section 80. The retainer 76 may be provided near its bottom end with small bulges 83 in the flat side sections 78 and a resilient tongue 85 is provided in the bowed central section 80, the lower end of the tongue projecting outwardly from the concave surface of the section 80. Adjacent the bottom of the slots 82 the section 80 is weakened by a groove or depression 84. Referring to Figs 2 and 4 the retainer 76 is inserted into a slot 86 in the padlock body 10 the slot 86 having on side portions to receive the sides 78 of the retainer 76 and a bowed portion opening into a bore 14 in the body 10 which bore receives a hinge leg 20 of the shackle 18. When the retainer is inserted in the slot 86 the concave surface of the bowed section 80 will be substantially coincident with the periphery of the bore 14. At its upper end the slot 86 is closeal by a wall 88 inclined towards the bore 14. When the retainer is forced up the slot 86 the end of the section 80 between the slots 82 is bent by engagement with the wall 88 and due to the weakening groove 84, and enters into the bore 14 in the path of an annular shoulder 30 on the lower end of the shackle leg 20. At the same time the bulges 83 are flattened in the slot 86 and the resilient tongue 85 snaps into a working position over the closed bottom end of the bore 14. The shackle is urged upwardly by a spring 28 to a limiting position determined by the bent-in section 80 of the retainer 76. In a modified retainer described with reference to Figs. 10 and 11 (not shown) the weakening groove 84 and tongue 85 are omitted. The locking leg 22, Fig. 2, of the shackle 18 is notched at 26 to engage under a locking ledge 72 on the cylinder 16 of a barrel lock, axially slidable and rotatable in a bore 12 in the padlock body 10. A spring 56 having lateral ends 64, 68 urges the cylinder downwardly and the ends 64, 68 engage the body 10 and in a slot 70, Fig. 6, in the cylinder, respectively, to rotate the cylinder clockwise to a locking position shown in Fig. 4, wherein a flange portion 34 of the cylinder abuts the end of an arcuate recess 36 in the bore 12. The cylinder is provided with a key slot 37, Fig. 4, and spring pressed tumblers 38, Fig. 5, which engage in the locking position in a slot 40 in the bore 12. A slot 42 is preferably provided opposite the slot 40. When the key is inserted the cylinder rotates anti-clockwise, the tumblers can, when the key is removed, enter into a slot 44, Fig. 5, in the bore 12. A slot 46 is preferably provided opposite the slot 44 and both slots have inclined walls to cam the tumblers 38 inwardly when the cylinder 16 is turned clockwise to the locking position, by snapping down the shackle leg 22. When the shackle 18 is moved to its locked position the leg 22 engages an inclined face (not shown) on the cylinder adjacent the ledge 72 and forces the cylinder to rotate in the clockwise direction to the locking position. The cylinder 16 is retained in the bore 12 by a member 48, Fig. 6, slidable in a radial slot 50 in the cylinder. When the cylinder 16 is pushed up into the bore 12 the member 48 is urged outwardly by the spring 56, engaging a finger 52 on the member, into an undercut recess 54 in the bore 12. A bowed portion 58 on the member 48 is engageable in openings 60, 62, Fig. 6, in the locking and unlocking positions of the cylinder, respectively.