Year: 1898

page_text: I, THOMAS JOHN PERRETT, of 181, Queen Victoria Street, London, E.C.,
Engineer, do hereby declare the nature of this invention to be as follows;-
This invention relates to an improved construction of vehicle wheel having a wood
tyre secured to a metal rim, and especially suitable for motor cars, traction engines
and other heavy road vehicles. In a wheel constructed according to my invention,
as hereinafter described, the wood tyre is readily secured in place and cannot
become accidentally detached or displaced.
In carrying my invention into effect, I provide the wheel with a metal rim
having a groove of dovetail or equivalent section formed around its outer
periphery, and around the bottom of this groove I form or provide a sharp edged
locking rib of wedge or equivalent shaped section. The wood tyre is composed of
a series of wood blocks of suitable shape which are forced in the line of the grain
or otherwise by hydraulic or other pressure into the dovetail groove aforesaid.
As the blocks are forced into the grooved rim their inner ends are entered by the
sharp edge of the locking rib and thereby split open and expanded so as to closely
fit the dovetail groove and become securely, locked therein.
The said tyre blocks may be of various shapes, for example they may be in the
form of cubes or rectangles; or of rhomboidal form, in which case the lines of
junction between the blocks will be at an angle to the wheel axis; or the meeting
faces of the blocks may be curved so that a concave face of one block fits a convex
face of the next.
The construction and arrangement of the wedge shaped locking rib may also
vary, for example the same may extend in a straight line around the rim groove,
or may be serpentine so as to enter the blocks alternately on opposite sides of
the centre line of the rim. Or in lieu of a continuous rib a series of locking
projections may be employed; or two or more continuous locking ribs may be
used instead of a single continuous rib if considered desirable.
T41 5th day of Wohnuary 1808

page_text: same is to be performed to be particularly described and ascertained in and by
the following statement;-
-
This invention relates to an improved construction of vehicle wheel having a wood.
tyre secured to a metal rim, and especially suitable for motor cars, traction engines,
and other heavy road vehicles.
In a wheel constructed according to my invention, as hereinafter described, the
wood tyre is readily secured in place and cannot become accidentally detached
or displaced.
In carrying my invention into effect, I provide the wheel with a metal rim
having a groove of dovetail or equivalent section formed around its outer
periphery, and around the bottom of this groove I form or provide a sharp edged lock-
ing rib or ribs of wedge or equivalent such as chisel shaped section. The wood
tyre is composed of a series of wood blocks of suitable shape which are forced in
the line of the grain or otherwise by hydraulic or other pressure into the dovetail
groove aforesaid.
As the blocks are forced into the grooved rim, their inner ends
are entered by the sharp edge of the locking rib, and thereby split open and expanded
so as to closely fit the dovetail groove and become securely locked therein.
The said tyre blocks may be of various shapes, for example they may be in the
form of cubes or rectangles, or of rhomboidal form, in which case the lines of
junction between the blocks will be at an angle to the wheel axis; or the meeting
faces of the blocks may be curved so that a concave face of one block fits a convex
face of the next.
The construction and arrangement of the wedge shaped locking rib may also
vary, for example the same may extend in a straight line around the rim groove,
or may be serpentine so as to enter the blocks alternately on opposite sides of
the centre line of the rin. Or in lieu of a continuous rib, a series of locking
projections may be employed, or two or more continuous locking ribs may be
used instead of a single continuous rib if considered desirable.
The inner faces of the wood tread strips may be first saw cut to lead the sharp
edges of the ribs into the cuts and so prevent undue splitting which might happen
with wood of a somewhat brittle character.
My invention is clearly represented on the annexed sheet of drawings.
Figure 1 sectional perspective elevation of a tyre rim of gutter formation with
two straight circumferentially knife like or wedge shaped projecting ribs.
Figure 2 similar elevation of a gutter shape of rim with a single but wavy or
serpentine circumferentially formed knife edge or wedge shaped rib therein.
Figure 3 represents portion of a wood tread tyre with my invention applied.
Figure shows a double ribbed rim with chisel wedge shaped ribs, so that sides
of the wood tread are forced outwardly to grip the flanges.
A metal rim with webs or wings B, B, forming side flanges, C. sharp edged
locking rib. D, wood tread in short lengths to shape and either plain ended
or formed with interlocking concave and convex shape, as indicated at the dotted
lines Figure 3, where I have shown the wings B, B, crowded into contact with
the shaped treads D.
The two sharp edged wedge ribs C, C, shown at Figure 1, are found to be
preferable to a single mid rib, as shown at Figures 2 and 3 for holding the treads
in place when forced into the rim A by hydraulic pressure, the wood being less
liable to split than with the mid-rib arrangement, and will enable the bottom
portions of the wood to fill out to the flanges and become fixed without necessi-
tating the flanges being afterwards crowded into contact, although this crowding
in may be effected for greater security and neatness.
It will be understood that the sharp edged wedge ribs may be separately secured
in the rim, or be formed during the rolling operation.
Having now particularly described and ascertained the nature of the said in-
vention and in what manner the same is to be performed I declare that what I
claim is:-
1. Providing a metal flanged rim of a wood tread wheel tyre with one or more

page_text: internal sharp edged ribs C, C, as and for the purposes described and substantially
as represented on the annexed drawings.
2. Securing wood tread strips in channelled or flanged wheel rims having sharp
edged wedged rib or ribs for entering and swaging and securing the wood into
contact with the flanges of said rim, substantially as indicated and described.
The 5th day of December 1898
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Thomas John Perrett.