Back to results
US 4,996,856 AGranted
Structure of cylinder lock
OwnerPeir-Kuen Lin, C. H. Hwanginventors
Life of this patent
Estimating the term…
Abstract
A cylinder lock includes a cylindrical housing connected with a circular insert at its bottom to receive therein a movable barrel and a fixed barrel. A plurality of lock pin assemblies are set in a plurality of pin holes vertically through the movable lock barrel to control the connection of the movable lock barrel with the fixed lock barrel by use of the various stepped pins of an authorized key. The stepped pins can be detached from the key for keeping separately.
Claims20
A cylinder lock comprising:
- a cylindrical housing;
- a fixed barrel fixedly mounted in said cylindrical housing, said fixed barrel having a plurality of pin holes formed axially therethrough adapted to receive a plurality of lock pin assemblies, respectively, a top surface, an axial alignment recess formed in said top surface, and an axle hole formed axially through a center thereof;
- a movable barrel rotatably mounted above and adjacent said fixed barrel in said cylindrical housing for rotation about a central longitudinal axis, said movable barrel having a plurality of pin holes formed axially therethrough adapted to receive the plurality of lock pin assemblies, respectively, and an axial alignment hole formed axially therethrough and adapted to register with said vertical alignment recess formed in said top surface of said fixed barrel, said pin holes of said movable barrel being arranged such that upon a predetermined rotational position of said movable barrel, said pin holes of said movable barrel align with said pin holes of said fixed barrel to form lock pin holes;
- an axle having a circular cross section along most of its length, having a flat portion at a bottom end thereof, and being integrally fixed to said movable barrel such that said axle extends downwardly from said movable barrel and is rotatably received within said axle hole formed in said fixed barrel;
- and
- a circular plate secured to a bottom end of said cylindrical housing below and adjacent said fixed barrel, said circular plate having a hole formed through a center thereof for insertion therethrough of said flat portion of said axle, and a plurality of positioning holes formed therethrough in registry with said plurality of pin holes of said fixed barrel, respectively, each of said plurality of positioning holes having a stepped sidewall with a plurality of stepped portions having respectively different diameters.
3 more elements
A cylinder lock comprising:
- a cylindrical housing;
- a plurality of lock pin assemblies;
- a fixed barrel fixedly mounted in said cylindrical housing, said fixed barrel having a plurality of pin holes formed axially therethrough adapted to receive said plurality of lock pin assemblies, respectively;
- a movable barrel rotatably mounted above and adjacent said fixed barrel in said cylindrical housing for rotation about a central longitudinal axis, said movable barrel having a plurality of pin holes formed axially therethrough adapted to receive said plurality of lock pin assemblies, respectively, said pin holes of said movable barrel being arranged such that upon a predetermined rotational position of said movable barrel said pin holes of said movable barrel align with said pin holes of said fixed barrel to form lock pin holes;
- and
- a key means for driving each of said plurality of lock pin assemblies downwardly within each of said lock pin holes, respectively, to thereby release a locking condition between said fixed barrel and said movable barrel and allow said movable barrel to rotate relative to sad fixed barrel, said key means comprising a key body and a plurality of stepped pins extending downwardly therefrom and corresponding in number to the number of said plurality of lock pin holes, said plurality of stepped pins being individually detachably connected to said key body such that each of said plurality of stepped pins can be carried by a different person.
3 more elements
Dependencies are inferred from the claim text.