Safety lock ring structure of a dispenser pump

Details Safety lock ring structure of a dispenser pump Safety lock ring structure of a dispenser pump

2002-02-11

2003-08-12

Derakshani, Philippe (Department: 3754)

Dispensing

With lock or fastening seal

Inhibiting actuation of discharge assistant

C222S321900, C222S384000

Reexamination Certificate

active

06604656

ABSTRACT:

RELATED U.S. APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
REFERENCE TO MICROFICHE APPENDIX
Not applicable.
FIELD OF THE INVENTION
The present invention relates generally to a dispenser pump, and more particularly to a safety lock ring structure of the dispenser pump.
BACKGROUND OF THE INVENTION
As shown in
FIGS. 1 and 2
, a dispenser pump
10
of the prior art is provided at the bottom with a piston rod
11
extending through a cap
20
into a cylindrical body
30
to urge one end of a spring
31
. The spring
31
serves to provide the piston rod
11
with a recovery force. The cylindrical body
30
is provided therein with a slot
32
and a check ball
33
which is retained in the slot
32
. As the dispenser pump
10
is exerted on by an external force, the contents of the cylindrical body
30
are dispensed. In view of the fact that the dispenser pump
10
is apt to be exerted on by the external force accidentally or inadvertently, the cylindrical body
30
is provided at the top end with a fastening cap
21
which is provided with inner threads
22
. In the meantime, the piston rod
11
of the dispenser pump
10
is provided at the top segment thereof with outer threads
12
engageable with the inner threads
22
. The piston rod
11
is locked by the fastening cap
21
such that the outer threads
12
of the piston rod
11
are engaged with the inner threads
22
of the fastening cap
21
, thereby preventing the contents of the cylindrical body
30
from being dispensed by accident. However, if the dispenser pump
10
is inadvertently turned in reverse, the inner threads
22
of the fastening cap
21
become disengaged with the outer threads
12
of the piston rod
11
, as shown in
FIG. 2
;
BRIEF SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a dispenser pump with a safety structure for preventing the contents of the dispenser from being dispensed accidentally or inadvertently.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by a dispenser pump safety structure comprising a dispenser pump head, a locking cap, and a twist-off means to avert the disengagement of the locking cap with the dispenser pump head, thereby preventing the contents of the dispenser from being dispensed accidentally or inadvertently.


REFERENCES:
patent: 4479589 (1984-10-01), Ford
patent: 5549223 (1996-08-01), Hori

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