Casing structure for a cotter-pin type lock core

Details Casing structure for a cotter-pin type lock core Casing structure for a cotter-pin type lock core

2003-06-20

2004-11-02

Walsh, John B. (Department: 3676)

Locks

Operating mechanism

Key

C070SDIG001, C070S367000, C070S372000

Reexamination Certificate

active

06810703

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a casing structure for a cotter-pin type lock core. More particularly, the present invention is related to a removable casing structure for preventing release of cotter pins from a lock core by accident.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional cotter-pin type lock core includes a lock stator
90
and a lock rotor
92
. The lock stator
90
is regarded as an outer housing and provided with a cylindrical hole
91
adapted to accommodate the lock rotor
92
for allowing axial rotation. The lock stator
90
and the lock rotor
92
are formed with a plurality of pinholes
93
for receiving elastic members
94
, upper cotter pins
95
and lower cotter pins
96
. The lock stator
90
is further provided with a plurality of through holes
99
which are aligned with the pinholes
93
. A key
97
is able to insert into a keyway
98
formed on the lock rotor
92
for unlocking. To remove or change the cotter pins
95
and
96
, the lock rotor
92
is turned to align the pinholes
93
with the through holes
99
of the lock stator
90
. Consequently, an unwanted set of lower cotter pins
96
can be replaced.
When the lower cotter pins
96
are replaced, the lock rotor
92
must be turned to avoid releasing the lower cotter pins
96
through the through holes
99
. However, an inappropriate rotation of the lock rotor
92
may align the pinholes
93
with the through holes
99
that may cause an accident release of the lower cotter pins
96
through the through holes
99
.
Taiwanese Patent Publication No. 332,572 discloses a removable structure for a cotter-pin type lock core and a key thereof. The cotter-pin type lock core is provided with a plurality of sealing members which are adapted to seal corresponding pinholes by screw-connection.
Furthermore, Taiwanese Patent Publication No. 489,879 discloses a cotter-pin type lock core and a cotter-pin cover combined therewith. The cotter-pin cover is adapted to cover pinholes by engaging the cotter-pin cover with the lock core.
Still, there is a need for a guard device for a cotter-pin type lock core which is convenient for changing cotter pins.
The present invention intends to provide a casing structure for a cotter-pin type lock core, and the casing structure is removable and convenient for assembling with the lock core in such a way to mitigate and overcome the above problem.
SUMMARY OF THE INVENTION
The primary objective of this invention is to provide a casing structure for a cotter-pin type lock core which is convenient for assembling with the lock core that prevents cotter pins from release.
The secondary objective of this invention is to provide a casing structure for a cotter-pin type lock core which is convenient for removing from the lock core and resealing it after changing cotter pins.
The casing structure for a cotter-pin type lock core in accordance with the present invention consisted of a semi-cylindrical casing which defines a longitudinal axis. The semi-cylindrical casing includes a first sidewall, a first side edge, at least one first engaging portion, a second sidewall, a second side edge and at least one second engaging portion. The first engaging portion and the second engaging portion are extended from the first side edge and the second side edge respectively, and adapted to engage with the lock core. The first side edge and the second side edge are opposite and define a maximum diameter. And the first engaging portion and the second engaging portion define a width that is slightly smaller than the maximum diameter defined by the first side edge and the second side edge.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description and the accompanying drawings.


REFERENCES:
patent: 1736685 (1929-11-01), Wilder
patent: 2111098 (1938-03-01), Segal
patent: 2977786 (1961-04-01), Kendrick et al.
patent: 3176488 (1965-04-01), Jacobi
patent: 3673831 (1972-07-01), Nelson
patent: 3774423 (1973-11-01), Orr
patent: 4123926 (1978-11-01), Elder
patent: 4472953 (1984-09-01), Gater
patent: 6170307 (2001-01-01), Feder

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