Padlock
AssigneeAardee Spring & Lock Company Limited
InventorJohn McCoag
Life of this patent
Estimating the term…
Abstract
A disposable padlock which cannot be opened by a key but whose locking effect can only be nullified by the use of sufficient force to deform the padlock. A shackle is automatically engaged when inserted into a body portion of the padlock. Engagement members mounted in the body portion are biassed to engage recesses in limbs of the shackle in such a way that the padlock will deform before the shackle will be removed by the application of force. Means may be provided for preventing rotation of the limbs of a sheared shackle engaged by the body portion.
Claims10
A keyless disposable padlock comprising a body portion having two substantially parallel bores, a shackle having two limbs capable of insertion into the respective bores of the body portion, a cross-bore in the body portion partially intersecting with at least one of the bores and having its cross-section eccentric relative to the bore which it intersects, engaging means in the cross-bore, means biassing the engaging means to a position in the partial intersection of the cross-bore and at least one of said bores, at least one limb of the shackle for insertion into at least one intersected bore havingn a portion arranged to be engaged by the engaging means automatically when the limb is inserted into the bore so that the engaging means lies trapped in said partial intersection between the engaged limb of the shackle and the opposite wall of the cross-bore, the engagement by the engaging means preventing movement of at least one limb along at least one of said bores whereby the padlock cannot be opened without damaging at least one of the component parts of the padlock.
Dependencies are inferred from the claim text.