Abstract: An antitheft device for marking articles for sale and comprising two members, which automatically interlock one another when one member is inserted in a cavity in the other member, the first member being a rod-shaped body with a completely or partially pointed insertion end, whereby said rod-shaped body is capable of engaging for instance balls loosely arranged in the cavity of the second member, a third member of magnetizable material being inserted below the loosely arranged balls, whereby a resilient member with an upward driving force is placed below said third member. According to the invention the resilient member is an annular plastic member with inward connecting parts connected to a centrally arranged disk-shaped plastic member pressing against the third member in the cavity, the annular plastic member being secured by way of squeezing to an annular groove in the bottom of the housing.

Abstract: A power striker pin mechanism utilizes a base plate having a horizontal guide slot in its front side surface and a vertical guide slot in its rear side surface. A striker pin carrying slider is slidably received in the horizontal slot and is formed with a cylindrical post portion which projects rearwardly of the slider through a clearance opening in the base plate and through the vertical slot at the rear side of the base plate. A circular cam is located in the vertical slot and formed with an eccentric bore which rotatively receives the post portion of the slider. The circular cam is mounted upon a guide member for rotation relative to the guide member about its center and the guide member in turn is mounted for movement vertically relative to the base plate within the vertical slot. A flexible cable fixed at one end to the cam is tensioned to apply a torque to the cam.