Improvements in Pumps for Inflating Pneumatic Tyres and the like.
Year: 1896

page_text: Date of Application, 3rd Sept., 1896-Accepted, 10th Oct., 1996
COMPLETE SPECIFICATION.
Improvements in Pumps for Inflating Pneumatic Tyres and
the like.
I, WILLIAM FRANK BROWNE, of Leggett's Hotel, Park Row, New York
City, in the County and State of New York, United States of America, Engineer,.
do hereby declare the nature of this invention, and in what manner the same-
is to be performed, to be particularly described and ascertained in and by the-
following statement :-
This invention relates to a pneumatic pump in which the piston or plunger is.
forced back into the raised or retracted position by means of a suitable spring.
The object of the invention is to provide a pneumatic pump which is simple in.
construction, and which is especially effective and durable in use.
The matter constituting my invention will be defined in the claims.
I will now describe the details of construction and operation of my improved.
pump, by reference to the accompanying drawings, in which,
Figure 1 represents a vertical, central section of the pump.
Fig. 2 represents a top plan view thereof.
Fig. 3 represents an elevation of the pump barrel, or cylinder, the piston or
plunger being depressed and enclosed within the same.
The-
Fig. 4 represents a side elevation of a slightly modified form of pump.
The preferred form of my pump is illustrated in Figs. 1, 2 and 3.
cylindrical barrel, A, is preferably made by drawing or spinning from a suitable
piece of metal, so as to form it without seam or joint, and is provided at the top.
with a concave flange b, and at the bottom with a boss, a, having a screw-threaded
opening for attachment of an escape pipe. The piston B, (Fig. 1) is, preferably,.
made with a cylindrical lower end and a conical upper end, or, more correctly, in.
the form of the frustum of a cone with a central opening, and with the upper edge
turned over to form an outwardly projecting flange d, which is, preferably, concave
at the under side, as shown.. The plunger B, is hollow, and has, at the lower end,.
a valve 6", and suitable openings a¹. The upper part of the piston, which projects.
above the cylindrical barrel is made conical for the purpose of permitting the
coiled spring C to telescope, and all of its turns to lie, one within the other, in the
some horizontal plane, inside of the flange b, thus permitting the piston to be
depressed and entirely enclosed within the pump barrel when not in use, as shown
in Fig. 2. The lower end of the spring C is supported on the flange b, of the
barrel, and the upper end thereof bears against the under side of the Hange d, of
the plunger.
The piston, or plunger B, may be made with parallel walls throughout its-
length, as shown in Fig. 4, and with this construction, the supporting flange b', for
spring C. is preferably secured a little below the top of cylinder A. In this
construction, the spring C, will be coiled around the periphery of cylinder A, and
when the plunger B is depressed, will lie in the space between the top of cylinder A,.
and the flange b¹.
The coiled spring C, serves the purpose of forcing the plunger back or into a
raised position after it has been depressed by the operator. By attaching a pipe
to the screw-threaded boss, a, air may be conducted to any holder or place of use,
such as a pneumatic bicycle-tire.
This pump is very light and simple in construction and well adapted for the-
purpose for which it is intended.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a pneumatic pump, the cylinder or barrel having a projecting flange, and
the piston or plunger B, having at its upper end a suitable flange, as d, in
combination with a suitable spring. interposed between said flanges, substantially
as and for the purposes described.
2. In a pneumatic pump, the cylinder or barrel having a circumferential flange
and the piston or plunger having a conical upper end and an outwardly turned
flange at or near its top, in combination with a coiled spring interposed between
said flanges and adjacent to said conical portion of the plunger, substantially as
and for the purpose described.
Dated this 3rd day of September 1896.
°
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.