Pneumatic Tyre Pressure Gauge.
Year: 1899

page_text: Date of Application, 17th May, 1899
Complete Specification Left, 19th Feb.. 190) -Accepted, 17th May, 1900
Pneumatic Tyre Pressure Gauge.
I, CHARLES LILLICRAP, Fifty-nine, Robert Street, Manselton, Swansea, South
Wales, Electrician, do hereby declare the nature of this invention to be as
follows:-
The apparatus consists of a metal cylinder, with a slot cut longitudinally
thorough one side, with a cover on each end with a hole in the centre which
The main screw which passes thorough the cylinder
form guides for a screw.
carries a loose shoe outside the cylinder. It also carries a deeply groved metal
wheel which carries a U shaped guide and pointer inside the cylinder, for setting
It also carries a metal nut which carries a pointer for
at a known distance.
indicating the pressure. Between this nut and the top cover, is a spiral spring
with a known resistance to pressure. On the top cover is attached a metal strap
with two lugs, one on each end to loop a flexible metal strap which is slotted
to suit any size. This second strap encircles, when in use, the apparatus and tyre.
1000
CHARLES LILLICRAT.
1, CHARLES LILLICRAP, of Fifty-nine, Robert Street, Manselton, Swansea, South
Wales, Electrician, 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:-
The object of my invention is to provide an apparatus which will enable those
using pneumatic tyres to ascertain the resisting pressure of air or gas inflated or
pumped into the inner or air tube instead of by the usual method of pressing the
tyre with the finger or thumb or between the finger and thumb as by such method
it is impossible to ascertain what the pressure inflated or pumped into the tube
would be equal to resist. By my invention a known pressure can be forced into
the tube to support the tyre to suit the rider for safe and easy riding further than
this it frequently occurs when the air pressure is low that the tyres of cycles are
taken off the wheels and the air tubes taken out to locate the fault under the
impression that the tube is leaking or a small puncture has occured when really
nothing of the kind has happened the slackness being due only to inadequate air
pressure. By means of my invention the internal pressure or resisting pressure
of the tube and tyre can be readily known and retained the same.
In order that my invention may be clearly understood and more easily carried

page_text: into practice I have appended hereunto a sheet of drawings upon which I have
fully illustrated the nature of my said invention together with the mode of and
means for carrying the same into effect.
Figure 1 is a section through an inflated tyre shewing my indicator attached
thereto and in front elevation.
Figure 2 is a side elevation.
Figure 3 is a sectional elevation through Figure 1 when disengaged.
Figure 4 is a broken off view of the band attachment.
My device consists of a metal cylinder A with the slot a cut longitudinally
down one side, the cylinder being divided and marked on the one side near the
top to represent pounds per square inch and on the same or other side near the
bottom to represent parts of an inch. The ends of the cylinder are provided with
the metal covers a having holes in the centre forming guides for the screw B
which passes through them.
Mounted upon the aforementioned screw at the bottom is the loose shoe c¹
shaped to the form of a knob while on the same screw, within the cylinder, the
deeply grooved metal wheel D is fastened and carries a U shaped guide d¹ with
pointer E for setting at a known distance. The screw B also carries the metal
nut H bearing the pointer F, which indicates the pressure per square inch, when
the apparatus is in use, the nut H being retained in position by the internal
socket. Between the nut H and top cover the spiral spring K is provided
having a known resistance to pressure. The metal strap M is attached to the top
cover for resisting back pressure and is provided with the two metal lugs m¹ one
on each side for looping the flexible metal strap N which is provided with slots n¹
to suit any size tyre and when in use is attached to the device and encircles a
portion of the wheel and tyre. In using the gauge it is necessary to turn the
screw B to the left, thereby unscrewing same by means of the milled nut P which
is locked in position by a lock nut 2 at the top of the screw B, until the set
pointer E which is the lower one, comes on the first mark under o from the pres-
sure pointer, after which the flexible metal strap is looped onto one of the lugs,
the end after being passed under the rim of the wheel being looped to suit the
size of tyre. The gauge being then in position the main screw 13 is turned by
means of the milled nut to the right so as to press the button el onto the tyre and
the set pointer then indicates the parts of an inch and the pressure pointer indi-
cates the resisting pressure of the tyre. There is however no necessity to loop
the gauge for the pressure pointer to indicate zero or o but it should be looped so
that any level number of pounds is represented on the pressure scale by means
of the slots on the flexible metal strap such slots being cut at an equal distance
to suit the distance of the set scale.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
A pneumatic tyre pressure gauge with means of attachment and detachment by
which the pounds pressure to which the tyre is inflated is indicated substantially
such as and for the purpose herein set forth and illustrated.
Dated this 95th d
LEWIS WM. GOOLD,
Agent for Applicant, 5, Corporation Street, B'ham.
LEWIS WM. GOOLD,
Agent for Applicant, 5, Corporation Street, B'ham.