Abstract: A barrel lock and a key for locking and unlocking the barrel lock. The lock has a hollow barrel with a spring loaded plunger that reciprocates within the bore of the barrel. A recess is provided in an axial blind bore formed in the rear end of the plunger, the recess defining a gripping surface for unlocking the barrel lock. A spring loaded baffle washer having a key central aperture is positioned within the barrel bore rearwardly of the plunger. The baffle washer limits access to the plunger and prevents unauthorized unlocking of the barrel lock.The key has elongated outer expanding fingers and an inner coaxially arranged expander rod. The expanding fingers are sized and shaped so that they can pass entirely through the key central aperture of the baffle washer. When the key is fully inserted into the lock and the key handle is operated, the expanding fingers radially expand and press against the gripping surface in the blind bore.

Abstract: A double-acting barrel lock and key in which the lock has a hollow plunger which reciprocates between a security forward locking position and a normal rearward unlocking position. The lock also has a lock pin coaxially mounted within the hollow plunger for reciprocating between a forward unlocking position and a normal rearward locking position. When a nail-type pick is inserted into the rear of the lock and drives the lock pin forwardly to its unlocking position, a spring urges the hollow plunger forwardly to its security locking position in which the locking balls are maintained in their outward locking position.A key has double-acting means for simultaneously maintaining the hollow lock plunger in its normal rearward unlocking position while moving the lock pin to its forward unlocking position, thereby permitting the locking balls to move inwardly to their unlocking position.

Abstract: Improved method of making an abrasive wire for sawing stone. The improvement resides in the step of affixing the solid abrasive body to the support element. This step is accomplished by deforming the axially protruding free end of the underlying smaller diameter portion of the support element so that it enlarges and assumes the same diameter as the larger diameter other end of the support element, thereby sandwiching and locking the abrasive body solidly therebetween.