Improvements in Pneumatic Tire Pumps.
Year: 1896

page_text: Date of Application, 20th Oct., 1896
Complete Specification Left, 17th July, 1897-Accepted, 14th Aug., 1897
PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Tire Pumps.
We, THOMAS AWRENCE MURPHY, DANIEL JOSEPH MURPHY, both of No. 841
Broadway, New York, County and State of New York, United States of America,
Engineers, and ISAAC HICKS of No. 195 Rutledge Street, Brooklyn, County of
Kings and State of New York, United States of America, Notary Public, do
hereby declare the nature of this invention to be as follows:-
The invention relates to small hand pumps adapted for inflating pneumatic
tires, and especially adapted by compactness of construction to be carried in the
tool bag of a bicycle.
The object of the improvement is to attain high compressing power with
moderate effort by employing a plurality of cylinders and pistons actuated by a
short inner crank and a long hand crank, affording leverage and division of work
through the circle of rotation; the whole being arranged consistently with
compact construction.
The invention consists essentially of two aligned cylinders connected by a central
pitman chamber or case; the outer heads of the cylinders being permanently
closed; the whole forming an integral box with the only opening at one side of
the pitman chamber, which is provided with a removable lid.
The invention also consists in providing pistons connected by means of a
separable rigid arm to which is connected the pitman: the crank and its shaft
being mounted in the removable lid of the pitman chamber, so that by the
removal of the said lid, the pitman may be disconnected from the said piston arm,
and then by disconnecting the members of said arm from each other, the pistons
may be removed through the opening in the side of the pitman chamber.
The invention also comprises certain improvements in the construction of the
pistons themselves: whereby the same act as valves for the induction of air into
the cylinders, and whereby the pistons are guided. The pistons are composed of
two plates or discs between which are confined cup leather packings. The disc
on the concave side of the cup is small enough in diameter to allow the cup to
contract away from the sides of the cylinder and form a valve for the passage of air
between the cup and the cylinder, and the disc on the convex side of the cup is
made of a diameter to fit the cylinder, but is provided with marginal openings to
allow the air to pass.
By means of the aforesaid construction, the cost of manufacture is reduced to
the minimum, owing to the few parts that require to be fitted, and combined
lightness and strength are secured. Movable parts are enclosed and protected,
and the external shape of the case affords a convenient and secure hand-hold
while pumping, and occupies but little space when packed.
AL 10th of Antahan 1906
CRUIKSHANK & FAIRWEATHER,
62 St. Vincent Street, Glasgow, Chartered Patent Agents,
Agents for the Applicants.

page_text: Improvements in Pneumatic Tire Pumps.
We, THOMAS LAWRENCE MURPHY, DANIEL JOSEPH MURPHY, both of No. 841
Broadway, New York, County and State of New York, United States of America,
Engineers, and ISAAC HICKS of No. 195 Rutledge Street, Brooklyn, County of
Kings and State of New York, United States of America, Notary Public, 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:-
Our invention relates to the class of small hand pumps adapted for inflating
pneumatic tires, and especially adapted by compactness of construction to be
carried in the tool bag of a bicycle, and adapted for low cost of manufacture and
convenient accessibility and removal of parts for cleaning or repairs.
Our invention consists in certain novel features of construction hereafter
described and claimed.
Referring to the accompanying drawing, Figure 1 is a front sectional elevation,
taken on the line of Figure 2. Figure 2 is a side sectional elevation, taken
on the line y-y of Figure 1. Figure 3 is a cross section taken at -, Figure 1;
the disk 6, and cup of the piston being removed.
The cylinders A, A, are rigidly aligned and connected by a central connecting
case B, forming the pitman chamber, which is provided with a removable lid C.
The outer extremities D, D', of the cylinders A, A', are provided with permanently
fixed heads, and said cylinders are permanently fixed to the central case B; the
whole forming a single box with the only opening and means of access at C.
Each piston E, E, is provided with a respective section F, F, of a connecting
arm, separably connected together by screws 2, 2, or other suitable means. By
unscrewing the screws 2, 2, the pistons may be removed independently by deflecting
them with their respective rods at the angle to the axis - of the cylinders and
drawing them through the opening of the case B3, after the lid C, has been removed.
'Removable cylinder heads are thereby avoided, the heads being brazen on
affording a point of economical construction.
The inner crank G, is, inunted on the shaft H, journaled in the plate or lid C,
and the outer or hand crank I, is screwed on to the end of the shaft H, whereby
the same may be removed, permitting the removal of the plate C, and the crank G,
may then be detached from its connecting rod or pitman J, and removed, and then
the pistons can be turned around until the screws 2, 2, are accessible, and the
pistons can next be removed, leaving the box A, A, B, intact.
The pitman J, is connected to the arm F, F, at the point 3.
The lid C, is provided with a small perforation at 4, for admitting air.
Each piston E, E, has a flexible cup packing 5, 5, secured between metallic
disks 6, 7. and the disks 6, are of diameter sufficiently smaller than the inside of
'the cup to permit free play of the latter between the disk and the cylinder,
forming a valve which is closed when the piston is forced outward to compress air
on the concave side of the cup, but opens freely to admit air when the piston is
retracted forming a vacuum back of the piston.
In order to insure perfect operation the disk 7, on the convex side of the cup,
may be made of a diameter to fit the cylinder and center the cup; marginal
openings 8, 8, being provided on the said disk 7, as seen in Figure 3, to pass the
air.
The disk 7 is of such limited thickness as to permit the angular deflection of
the piston by the yielding contact of the cup packing 5, necessary for the removal
of the piston as described.

page_text: Delivery valves 9, 10,, are provided on the outer extremities of the cylinders,
and the delivery sides of these are connected together by a tube 11, the same
intersecting the case B, for convenience, and at one end of the box, on one of the
cylinder extremities, a delivery nipple is provided, for the attachment of a suitable
india rubber tube connection of usual character.
Having now particularly described and ascertained the nature of our said In-
vention, and in what manner the same is to be performed, we declare that what we
claim is:-
1. A pump constructed of a single shell comprising two aligned cylinders
permanently closed at their outer ends and connected by a central case having a
lateral opening, in combination with pistons having rods fixed thereto separably
connected so as to form a rigid arm, said pistons fitting the cylinders with yielding
contact so as to permit the deflection of their rods from the axis of the, cylinders
when disconnected, whereby the pistons may be removed toward one another and
angularly through said lateral central opening of the shell, and rotary means in
said connecting-case for operating the pistons.
2. The combination in a pump, of a single shell comprising two aligned cylinders
permanently closed at their outer ends and connected by a central case having a
lateral opening, pistons in said cylinders having rods fixed thereto separably
connected so as to form a rigid arm, said pistons fitting the cylinders with yielding
contact so as to permit the deflection of their rods from the axis of the cylinders
when disconnected, a removable cover on said lateral opening, a rotary shaft
journaled in said cover, an external hand-crank removably attached to said shaft,
an internal crank on said shaft, and a pitman separably connecting said internal
crank with said rigid arm of the pistons, substantially as and for the purposes
described.
1007
CRUIKSHANK & FAIRWEATHER,
62 St. Vincent Street, Glasgow, Chartered Patent Agents,
Agents for the Applicants.