Detachable lock core

Details Detachable lock core Detachable lock core

2001-04-17

2003-03-18

Browne, Lynne H. (Department: 3676)

Locks

Operating mechanism

Key

C070S371000, C070S375000, C070S367000

Reexamination Certificate

active

06532782

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a lock, and more particularly to a detachable lock core.
2. Description of Related Art
Referring to
FIGS. 13-15
, a conventional lock is composed of a housing (
50
), a first tube (
60
) and a second tube (
70
). The first tube (
60
) is inserted in the housing (
50
) via a first end of the housing (
50
) and the second tube (
70
) is inserted in the housing (
50
) via a second end of the housing (
50
). A plurality of first apertures (
52
) is radially defined in the housing (
50
) and a plurality of second apertures (
62
) is radially defined in the first tube (
60
), and in alignment with the first apertures (
52
), respectively. A plurality of upper pins (
92
) and a plurality of lower pins (
91
) are respectively received in the first apertures (
52
) and the second apertures (
62
). Furthermore. each of the first apertures (
52
) has a resilient member (
93
) received therein.
The first tube (
60
) and the second tube (
70
) respectively have a first key hole (
61
) and a second key hole (
71
) in alignment with each other. An opening (
72
) is defined at a first end of the second tube (
70
) to receive a first end of the first tube (
60
) facing the second tube (
70
) therein. A first orifice (
73
) and a second orifice (
74
) are radially defined in the second tube (
70
) and in communication with the opening (
72
). The first tube (
60
) has a notch (not numbered) defined at the first end thereof and in alignment with the first orifice (
73
). A pin (
94
) is received in the orifice (
73
) and the notch. The second orifice (
74
) is aligned with the second aperture (
62
) which is defined at the first end of the first tube (
60
).
When a first key (
80
) is inserted in the key holes (
61
,
71
) to align the interface between the lower pins (
92
) and the upper pins (
91
) with the inner wall of the housing (
50
), the first tube (
60
) and the second tube (
70
) can be turned about the housing (
50
). When a second key (not shown or numbered) is inserted in the key holes (
61
,
71
), the lower pin (
91
) at the first end of the first tube (
60
) is not pushed up, and the corresponding upper pin (
92
) is still inserted in the second orifice (
74
). In this case, the first tube (
60
) can be turned about the second tube (
70
) and detached from the housing (
50
).
A user must prepare at least two keys respectively to unlock and detach the lock core, which is very inconvenient. Furthermore, when the first tube (
60
) is detached from the housing (
50
), the lower pins (
91
) may be faced downward and will escape from the second apertures (
62
).
Therefore, the invention provides an improved lock core to mitigate and/or obviate the aforementioned problems.
SUMMARY OF THE INVENTION
The main objective of the invention is to provide a lock core which is convenient for a user to detach.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 3564879 (1971-02-01), Bennett
patent: 4630457 (1986-12-01), Kincaid et al.
patent: 5161397 (1992-11-01), Raybary
patent: 5431034 (1995-07-01), Fann et al.
patent: 5964110 (1999-10-01), Crocco et al.
patent: 6076386 (2000-06-01), Etchells et al.
patent: 6089059 (2000-07-01), Fan

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