Pumps – Expansible chamber type – Plural pumping chambers
Reissue Patent
2000-07-18
2002-06-25
Tyler, Cheryl J. (Department: 3746)
Pumps
Expansible chamber type
Plural pumping chambers
C417S531000, C417S440000, C092S146000, C092S058100
Reissue Patent
active
RE037763
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a bicycle tire pump, and more particularly, to a structure for connecting the head to the non-circular cylinder of the pump so as to have a strong connection between the head and the cylinder.
BACKGROUND OF THE INVENTION
Referring to
FIG. 5
, a type of conventional bicycle tire pump includes a non-circular cylinder
41
and a head
40
which is attached to the cylinder
41
. The non-circular cylinder
41
includes two circular tubes connected side by side so that there
have
are
two passages defined in the non-circular cylinder
41
with two sets of piston
device
devices
(
Figure
not shown) respectively received in the two passages. The head
40
has a valve received therein and
communicate
communicating
with the two passages so that when operating the two sets of the piston
device
devices
, pressurized air will flow through the valve. The head
40
generally is connected to the non-circular cylinder
41
simply by way of gluing
,
and the gluing area between the head
40
and the non-circular cylinder
41
is limited so that the head
40
tends to disengage from the non-circular cylinder
41
. Once there
has
is
leakage defined between the head
40
and the non-circular cylinder
41
, the bicycle tire pump is functionless.
The present invention intends to provide a structure for connecting the head to the non-circular cylinder of the bicycle tire pump, wherein a connecting member is securely received in the head and a bolt having a passage defined therethrough extends through the cylinder to be fixedly connected to the connecting member so as to provide a strong connection between the head and the non-circular cylinder. The present invention is designed to mitigate and/or obviate the disadvantage of the conventional tire pump.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a bicycle tire pump comprising a cylinder having two passages defined therethrough which are separated by a board, two openings respectively defined in a top of the cylinder and communicating with the two passages. Two pistons are respectively and movably received in the two passages.
A head is mounted to the top of the cylinder and has an outlet defined in one of two ends thereof with a valve received in the outlet. Two ways are defined in the head and respectively communicate with the two passages. A bolt extends through one of the two passages and is threadedly connected to the head, the bolt having a longitudinal passage defined therethrough which communicates with one of the two ways.
An object of the present invention is to provide the bicycle tire pump having two passages defined in the cylinder and the head mounted to the cylinder, a bolt extending through one of the two passages and threadedly engaged with the head to securely connect the head to the cylinder.
Further objects, advantages, and features of the present invention will become apparent from the following detailed description with appropriate reference to the accompanying drawings.
REFERENCES:
patent: 872043 (1907-11-01), Beck et al.
patent: 1390559 (1921-09-01), Huntley
patent: 2383181 (1945-08-01), Enslin et al.
patent: 3907461 (1975-09-01), Bouder
patent: 5683234 (1997-11-01), Chuang et al.
patent: 5715554 (1998-02-01), Downs et al.
patent: 5779457 (1998-07-01), Chuang et al.
patent: 5902097 (1999-05-01), Wu
Kamrath Alan
Rider Bennett Egan & Arundel LLP
Tyler Cheryl J.
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