Improvements in and relating to Pumps or Inflators for Pneumatic Tyres.
Year: 1898

page_text: COMPLETE SPECIFICATION.
Improvements in and relating to Pumps or Inflators for Pneumatic
Tyres.
I, WILLIAM HENRY BELCHER, of G, Thavies Inn, Holborn, in the County of
Middlesex, 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 pumps or inflators for pneumatic tyres so provided as
to be operated on the rotation of the wheel upon which they are mounted. The
object of the invention is to mount such a pump or inflator upon a pneumatic tyred
wheel in a simple and convenient manner.
The invention consists in the fixture of a pump or inflator for automatic opera-
tion on the rotation of a wheel by securing one extremity of the pump to the
usual air valve projecting inwardly from the rim of the wheel and connecting the
opposite extremity of the pump to the hub by means of guide rods or stays secured
to a strap encircling the hub, such stays serving the additional purpose of guide
rods for the cross head of the piston which is reciprocated by means of a connecting
rod operated from a fixed eccentric, or by other suitable means.
The invention is illustrated in the accompanying drawing in which
Figure 1 represents a part cross sectional elevation of a pneumatic tyred cycle
wheel having a pump or inflator mounted thereupon in accordance with the present
invention, while
Figure 2 is a front elevation corresponding thereto.
In carrying the invention into effect as illustrated in the accompanying drawings
a pump A is provided having a nozzle A¹ at one extremity secured by means of a
screwed collar B to the air valve C of any ordinary construction which is provided
upon the rim D of the wheel. The opposite extremity A2 of the pump A has
screwed therein a plug E serving to guide the piston rod in its travel and to
exclude dust and dirt from entry within the interior of the pump, such plug E
being provided with an orifice or having its central hole provided of such a
diameter as to unrestrictedly admit air on the outward stroke of the piston. The
inner end A³ of the pump A has provided thereupon a flange Feither screwed
thereupon or abutting against a shoulder provided on its extremity. This flange F
is secured by two stays G and by a connecting strap H to the hub I of the wheel,
nuts being screwed upon the extremities of the rods G by which they are
effectively tightened or braced. The stays G serve the purpose of carrying the
cross head J to which the extremity of the piston rod K is connected and to which
also the extremity of the connecting rod L is secured by means of a pin M and
nut N. The stays or guide rods G may be maintained spaced apart by means of
a bridge or distance piece O.
In such a fixture of the pump the strap I will adapt itself to any size of hub and
a slot i provided therein will serve to clear the lubricator usually provided in
the centre of the hub no matter what the position of the lubricator relative to the
alve of the tyre

page_text: Motion is communicated to the cross head J by means of a connecting rod L
whose extremity may be provided with a series of holes or a continuous slot so that
the stroke of the pump may be thereby adjusted. The connecting rod L is secured
to a strap P running within a peripheral groove in the fixed eccentric disc Q
such disc being mounted upon a spindle R of the wheel and being secured to the
fork S by means of a strap T.
It will be understood that upon the rotation of the wheel D the strap P will run
round the fixed eccentric disc Q and in so doing cause a reciprocation in each
direction for every revolution thereof, the extent of reciprocation and the quantity
of air forced in the tyre being regulated by the means before described. In the
alternative the fixed eccentric disc Q may be provided with a radial slot so that
the degree of eccentricity with the spindle may be varied, thereby providing for
the variation of the extent of the reciprocation of the pump.
After the pump has been inflated to the required degree the connecting rod may
be unfastened from the pin M and turned over on the pin 7 and then fastened
to the fork S by means of a strap U as indicated in dotted lines in Figure 1
and 2.
When a puncture of the tyre has been made the connecting rod L may be set so
as to give a minimum reciprocation of the piston so that on the rotation of the
wheel a continuous supply of air shall be forced into the tyre. In order to avoid
too great a pressure of air within the tyre a safety valve may be provided so as to
relieve the pressure on a determined degree being exceeded.
Having now particularly described and ascertained the nature of
invention, and in what manner the same is to be performed, I declare that what
my said
I claim is:
1. Means for the fixture of an inflator or pump to a pneumatic tyred wheel
consisting in securing one end of the pump to an air valve provided upon the
rim and the opposite end to the hub by means of stays and a strap, which stays
serve the purpose of guide rods for the cross head of the piston rod to which motion
is imparted on the rotation of the wheel, substantially as and for the purpose
herein before described.
2. Means for the automatic inflation of the tyre of a pneumatic wheel consisting
of parts constructed and operating substantially as hereinbefore described.
Dated this 17th day of September 1898