초록 ▼

A plunger type lock comprising a barrel with an axial bore, locking members in the form of balls housed in the barrel wall and extensible outwardly from the barrel by a plunger axially slidable within the barrel bore, at least one further ball housed in an opening in the wall of the plunger and exte

A plunger type lock comprising a barrel with an axial bore, locking members in the form of balls housed in the barrel wall and extensible outwardly from the barrel by a plunger axially slidable within the barrel bore, at least one further ball housed in an opening in the wall of the plunger and extensible outwardly therefrom and a peripheral groove on the inner wall surface of the barrel for receiving the further ball, the further ball being forceably moved and held in the barrel\s groove by an incorrect key, instrument or an implement to prevent and resist movement of the plunger whenever an unauthorized attempt to operate and open the lock is made.

대표청구항 ▼

A plunger type lock comprising a barrel with an axial bore, locking members on said barrel and extensible outwardly from said barrel, plunger means movable axially within said bore and in a first axial, locking position thereof, holding the locking members in extended position, said plunger means in

A plunger type lock comprising a barrel with an axial bore, locking members on said barrel and extensible outwardly from said barrel, plunger means movable axially within said bore and in a first axial, locking position thereof, holding the locking members in extended position, said plunger means in a second axial, unlocking position permitting the locking members to move inwardly of said barrel, means biassing said plunger means into its first axial position, and means for preventing axial movement of said plunger means into its second axial position comprising at least one further locking member carried by said plunger means and movable inwardly and outwardly of said plunger means, said barrel having stop means engageable with said further locking member when said plunger means is in its first axial position and said further locking member extends outwardly of said plunger means, whereby displacement of said further locking member outwardly of said plunger means with an implement when said plunger means is in its locking position causes said further locking member to engage said stop means and prevents axial movement of said plunger means toward its second axial position.