Pumps – Expansible chamber type – Having separate noncyclic valve
Reexamination Certificate
2003-01-02
2004-11-09
Freay, Charles G. (Department: 3746)
Pumps
Expansible chamber type
Having separate noncyclic valve
C137S228000
Reexamination Certificate
active
06814552
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of Invention
The present invention relates to a pump that is capable of releasing excessive air.
2. Related Prior Art
Taiwanese Patent Publication No. 446070 teaches an upright pump including internal and external cylinders. This conventional pump includes a base
10
, an internal cylinder
20
mounted on the base
10
, a piston
43
movably received in the internal cylinder
20
, a rod
41
connected with the piston
43
, an external cylinder
50
mounted on the internal cylinder
20
, a pressure gauge assembly
70
mounted on the external cylinder
50
and a nozzle
90
in communication with the pressure gauge assembly
70
through a pipe
80
. The internal cylinder
20
defines a space
22
and an aperture
25
at a lower end in communication with the space
22
. A space
52
is confined between the internal cylinder
20
and the external cylinder
50
. The space
22
is in communication with the space
52
through the aperture
25
. The external cylinder
50
defines an aperture
53
near an upper end. The pressure gauge assembly
70
is located at the upper end of the external cylinder
50
. A space defined in the pressure gauge assembly
70
is in communication with the spare
52
through the aperture
53
. In pumping, pressurized air flows from the space
22
to the space
52
from which the pressurized air flows to the space defined in the pressure gauge assembly
70
through the aperture
53
. Although this conventional pump is equipped with the pressure gauge assembly
70
, a user may still over pump, for example, a tire with it. When this happens, it is better for the user to release air from the tire. Such releasing excessive air from the tire is not possible unless the nozzle
90
is removed from a valve of the tire. Such removal of the nozzle
90
from the valve of the tire is however inconvenient. What is worse, the user does not know if he or she releases too much air from the tire unless he or she engages the nozzle
90
with the valve of the tire again. This renders precise pumping more difficult.
The present invention is therefore intended to obviate or at least alleviate the problems encountered in prior art.
SUMMARY OF INVENTION
It is the primary objective of the present invention to provide a pump that is capable of releasing excessive air.
According to the present invention, a pump capable of releasing excessive air is shown to include a hollow base, a cylinder installed on and communicated with the hollow base, a piston movably received in the cylinder, a piston tube including a lower end connected with the piston and an upper end located beyond the cylinder, a tube including a lower end communicated with the hollow base and an upper end inserted into the piston tube through a channel defined in the piston, a release valve mounted on the upper end of the piston tube and a handle mounted on the upper end of the piston tube. The valve is installed on the handle so that it can be touched conveniently and operated easily by a user who is using the pump.
Other objectives, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the attached drawings.
REFERENCES:
patent: 4334839 (1982-06-01), Flagg
patent: D323876 (1992-02-01), Furusawa
patent: 5702239 (1997-12-01), Yang
patent: 5964577 (1999-10-01), Chuang
patent: 6371741 (2002-04-01), Wu
patent: 6422832 (2002-07-01), Wang
Kamrath Alan D.
Nikolai & Mersereau , P.A.
Specialized Bicycle Components, Inc.
LandOfFree
Pump capable of releasing excessive air does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pump capable of releasing excessive air, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pump capable of releasing excessive air will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3308022