Improvements in Inflators for the Pneumatic Tyres of Cycles.
Year: 1892

page_text: Date of Application, 16th Aug., 1892
Complete Specification Left, 9th May, 1893-Accepted, 10th June, 1893
PROVISIONAL SPECIFICATION.
Improvements in Inflators for the Pneumatic Tyres of Cycles.
AUGUSTINE CAMPBELL DAVISON 531 Holloway Road in the County of
Middlesex Civil Engineer do hereby declare the nature of this invention to be as
follows:-
The object of my invention is to make an inflator which shall combine the easy
portability of the ordinary small hand inflator with the capacity of the long pump,
usually 18 to 24 inches long, which it is now necessary to carry if speed of inflation
and high pressure are desired.
To obtain this I make my pump barrel of a comparatively short length and
stroke and with a correspondingly large diameter and fit it with a base so that it shall
stand vertically upon the ground, and I obtain the force necessary to work it by
moving the plunger up and down by means of the foot whereby the whole weight
of the body is available for working the plunger on the down or compression
stroke.
I prefer to make the base with a hinge to fold out of the way when not in use
and to fit the top of the plunger rod with a stirrup through which the foot may be
passed, so that the pump can be kept secure by placing one foot upon the hinged
base while the other foot is used to work the plunger up & down by placing the
toes through the stirrup.
The plunger may however be forced up by a spring placed in the barrel of the
pump in which case the stirrup can be replaced by a small foot plate of sufficient
size to form a comfortable rest for the sole of the foot.
Dated this the 15th day of August 1892.
AUGUSTINE CAMPBELL DAVISON.
COMPLETE SPECIFICATION.
Improvements in Inflators for the Pneumatic Tyres of Cycles...
AUGUSTINE CAMPBELL DAVISON 531 Holloway Road, in the County of
Middlesex, Civil Engineer do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
The object of my invention is to make an inflator which shall combine the easy
portability of the ordinary small hand inflator now in use, with the capacity
and power of the long pump usually 18 inches, to two feet in length, which it is
necessary at present to carry if speed of inflation and high pressure are desired.
To obtain this I make my pump barrel of a comparatively short stroke and
length, say about four inches, and with a larger diameter than is usual, and provide
it with a base so that it shall stand upon the ground. To obtain the force necessary
to work it which from the large diameter is greater than in a hand pump, I work
the plunger up & down by the foot whereby the whole weight of the body can be
placed upon the plunger during the down or compression stroke. I prefer to make
the base with a hinged foot piece which can be unfolded when the is required
for use and to fit the top of the plunger rod with a stirrup through which the foot
may be passed, so that the pump can be kept secure by placing one foot upon the
hinged foot piece, while the other foot is used to work the plunger by placing the
toes through the stirrup.
pump
In order that my invention may be fully understood I will more particularly
[ Paica Rd 1

page_text: describe it with the aid of the accompanying drawings in which similar parts are
marked with like letters of reference.
Figs. 1 and 2 are an elevation and plan respectively of a pump constructed
according to my invention.
Figs. 3 and 4 are an elevation and plan respectively showing a modification of
the foot piece.
Figs. 5 and 6 are an elevation and plan respectively showing a modification of
the foot piece.
Referring to the drawings A designates the barrel of the pump which may be
about 4 inches long and 1 inches in diameter.
In the barrel A a plunger of ordinary construction works, being actuated by the
plunger rod C, which has fixed to it at the top a roughened foot plate D. The
down stroke is the working or compression one. B is the foot piece for holding
the pump steady, which may be either screwed on as in Figs. 1 and 2 so as to be
entirely removable, or folded with a hinge as shown in Figs. 3 and 4 and Figs. 5
and 6.
E is the stirrup for the foot which I prefer to make of a leather strap as shown
so that it may be adjustable, but which may be constructed of metal if preferred.
F is the usual flexible tube for conveying the air to the tyre.
The action of the arrangement is as follows
The pump being held firm by placing one foot upon the foot piece B, the toes of
the other foot are placed through the stirrup E and the plunger drawn up & forced
down during the compression stroke by the weight of the body.
It is obvious that the plunger may be forced up by a helical spring placed
beneath it in the barrel of the pump in which case the stirrup E can be done away
with altogether and the small foot plate D will suffice to take the pressure of the
foot on the down or compression stroke, without departing from the principle of my
invention.
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
1st. A short stroke inflator for pneumatic tyres held by one foot & actuated by
the other whereby the whole weight of the body is available for compressing the
air, substantially as herein before described and illustrated, or any mere modification
of the same.
2nd. In a foot pump for pneumatic tyres the combination of barrel A, foot
plate B and stirrup E all constructed arranged and operating as and for the purpose
set forth.
Dated this the 8th day of May 1893.
AUGUSTINE CAMPBELL DAVISON.