Improvements in and relating to Pneumatic Tyres.
Year: 1893

page_text: Date of Application, 28th Feb., 1893
Complete Specification Left, 28th Dec., 1893-Accepted, 24th Feb., 1894
PROVISIONAL SPECIFICATION.
Improvements in and relating to Pneumatic Tyres.
I, HARRY HEWITT GRIFFIN, of 73 Norroy Road, Putney, in the County of
Surrey, Journalist, do hereby declare the nature of this invention to be as
follows:-
My invention relates to an improved device for contracting and lengthening the
bands or wires used for securing the covers of pneumatic tyres to wheel rims, and
it has for its object effecting this purpose in a more efficient manner than at present
obtains.
According to my invention I form on or attach to the ends of each band or wire
a toothed rack, and in the rim of the wheel I mount a spindle carrying a pinion
which gears with the racked ends of the band or wire so that by rotating the spindle
the band or wire may be drawn up taut or slackened, a suitable locking device
being provided to fix the spindle to the rim after the required adjustment has been
obtained. The ends of each band or wire or the racks formed on or fixed thereto
are guided by suitable guides formed in or on the rim to keep them in gear with
the pinion.
Each band or wire is furnished with this tightening device, or as a modification'
one such device may be used to operate both of the bands or wires, in which case
one end of each band or wire is hooked or otherwise attached to the wheel rim, and
a toothed rack is formed on or attached to the other end of each of the said bands
or wires the one lying in the opposite direction to the other. The pinion is then
made of such a diameter that it reaches across the groove in the rim from one side
of the rim to the other to engage with the racks on each band or wire. When the
said pinion is rotated the one binding band or wire is drawn up in one direction and
the other in the other direction.
As a further modification the racks may be made as loose pieces and be mounted
in grooves in the rim, the ends of the binding wire or wires being hooked to engage
with holes or slots in the said rack pieces, and further the grooves in which the said
racks slide may have inclined or sloping faces so that as they are moved to expand
or lengthen the wires or bands the hooked ends of the bands or wires are
automatically disengaged from the said racks.
A
ليوم
T
1009
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.
35
COMPLETE SPECIFICATION.
Improvements in and relating to Pneumatio Tyres.
I, HARRY HEWITT GRIFFIN, of 73 Norroy Road, Putney, in the County of
Surrey, Journalist, 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
10 and by the following statement :-
My invention relates to an improved device for contracting and lengthening the
bands or wires used for securing the covers of pneumatic tyres to wheel rims, and
it has for its object effecting this purpose in a more efficient manner than at present
obtains.

page_text: I attain this end in the manner shown by the accompanying drawing, in
which-
Figure 1 is a view in transverse section of a wheel rim and fixing bands arranged
according to my invention.and.
Figure 2 is a broken view in plan thereof.
Figure 3 is a broken view in plan showing a modification of my invention, and
Figure 4 is a broken view in side elevation of another form my invention may
assume.
Throughout the views similar parts are marked with like letters of reference.
I form on or attach to the ends of each baud or wire A a rack B and radially in
the rim of the wheel I mount two spindles D each carrying a pinion E on its
outer end which gears with the racks B on the ends of one of the bands or wires. A
so that by rotating the said spindle the said band or wire can be drawn up taut or.
slackened. A suitable locking device such as a lock nut d is provided to lock the
spindle D carrying the pinion E to the wheel rim C after the band has been drawn
up taut. The ends of each band or wire or the racks formed on or fixed thereto
are guided by suitable guides c formed on or attached to the rim C to keep them in
gear with the pinion.
Each band or wire A is furnished with this tightening device, or as a modification
as shown by Figure 3 one such device may be used to operate both of the bands or
wires, in which construction one end of each band or wire is hooked or otherwise
attached to the wheel rim, and a rack B is formed on or attached to the other end
of each of the said bands or wires the one lying in the opposite direction to the
other, the pinion E being made of a suitable diameter to gear with the racks on
both of the bands or wires. Thus when the pinion is rotated the one fixing band or
wire is drawn up in one direction and the other in the opposite direction.
Instead of mounting the spindles carrying the pinions radially in the wheel rim
they may be mounted in the sides of the wheel rim as shown by Figure 4 in which
construction the guide'c for the rack is preferably shaped to enclose both the rack
and the pinion.
As a further modification the racks may be made as loose pieces and mounted in
grooves or slides in the rim and the ends of the fixing bands or wires hooked to
engage with holes or slots in the said rack pieces, so that, the fixing bands or wires
can be removed from the wheel rim without removing the racks therefrom. In this
construction the grooves. or slides adapted to receive the racks may have inclined or
sloping faces so that as they are moved to expand or lengthen the bands or wires the
hooked ends of the said bauds or wires become automatically disengaged from the
said racks.
The fixing bands or wires may be either enclosed in pockets in the edges of the
cover of the tyre or they may engage with beads or enlargements on the edges of
the cover in the manner now well-known.
I wish it to be particularly understood that I do not limit myself to the precise
details of construction herein before described and illustrated by the accompanying
drawing but that I hold myself at liberty to make such changes and alterations as
fairly fall within the spirit and scope of my invention.
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 :-
:-
1. The respective combinations of parts forming my improved fastenings for
pneumatic tyres substantially as herein before respectively described.
2. The combination with the bands or wires used for securing the covers of
pneumatic tyres to wheel rims, of racks and pinions constructed and arranged to
operate substantially as herein before set forth.
3. A device for securing the covers of pneumatic tyres to wheel rims consisting
of two bands or wires each hooked or otherwise attached to the wheel rim at one
end and having a rack at the other end, and of a pinion mounted to rotate in the

page_text: rim and engage with the racks on the edges of the bands or wires to tighten or
slacken them simultaneously and provided with any suitable locking device as set
forth.
4. In a device for securing the covers of pneumatic tyres to wheel rims consisting
of bands or wires operated by racks or pinions, mounting the racks on or in inclined
guides or planes and hooking or otherwise attaching the ends of the bands or wires
to the said racks so that as the racks are operated to slacken the bands or wires the
said ends of the said bands or wires automatically disengage themselves from the
said racks, as set forth.
Dated thin noth dow of Deanamhan 1002
ROBERT E. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.