IMPROVEMENTS IN THE CONSTRUCTION OF LINK DRIVING BELTS
Year: 1884

page_text: I, JOHN KEIL TULLIS, of the firm of John Tullis & Sons, St Ann's Leather Works,
Glasgow, in the County of Lanark, North Britain, Leather Belt Manufacturer do
hereby declare the nature of the said invention for IMPROVEMENTS IN THE
CONSTRUCTION OF LINK DRIVING BELTS to be as follows:-
This Invention, which relates to the construction of Link Driving Belts, has for
its object in the first place to enable such belts to lie in close contact with the
rounded surface of the driving pulleys on which such Belts run.-This object is
effected by forming the Leather Links of a gradually increasing depth from the
centre towards the edges, thus constituting the driving surface of the Belt into a
rounded hollow channel. The Invention has for its object in the second place to
enable half twist driving belts of the "Link" construction, to lie close to the
driving pulley at the part where the twist of the belt tends to lift it out of contact
therewith. This object is effected by making the Links of the Belt of a gradually
increasing depth towards that side thereof which the twist tends to lift off from
the said pulley.

page_text: COMPLETE SPECIFICATION.
Improvements in the Construction of Link Driving Belts.
I, JOHN KEIL TULLIS of the firm of John Tullis and Sons, St. Ann's Leather
Works, Glasgow, in the County of Lanark, North Britain, Leather Belt Manu-
facturer do hereby declare the nature of my said invention for IMPROVEMENTS IN
THE CONSTRUCTION OF LINK DRIVING BELTS and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:
My Invention, which relates to the construction of link driving belts, has for its
object in the first place to enable such belts to lie in close contact with the
rounded surface of the driving pulleys on which such belts run. This object is
effected by forming the leather links of a gradually increasing depth from the
centre towards the edges, thus constituting the driving surface of the belt into a
rounded hollow channel. The Invention has for its object in the second place to
enable half twist driving belts of the "link" construction, to lie close to the
driving pulley at the part where the twist of the belt tends to lift it out of contact
therewith This object is effected by making the links of the belt of a gradually
increasing depth towards that side thereof which the twist tends to lift off from
the said pulley.
In order that my said Invention may be properly understood and readily carried
into effect I will now proceed to describe the drawings hereunto annexed.
Figure 1, is a plan of a portion of a driving belt constructed according to the
first part of my Invention.
Figure 2, is an end view corresponding to one end of Figure 1.
Figure 3, is an elevation of one edge of the belt corresponding to Figures
1 and 2.
Figures 4, 5, and 6, are respectively similar views of a portion of half-twist link
driving belt as constructed according to my present Invention.
With reference to the portion of link driving belt represented at Figures 1, 2,
and 3, the links a, are of a depth gradually increasing from the centre towards the
edges thereof, thus constituting the driving surface of the belt into a rounded
hollow channel. The belt may be hollowed out on one surface in the manner
herein before described; or, as shewn at Figure 2 of the annexed drawings the said
belt may be hollowed out at both its surfaces.
In constructing half-twist driving belts in accordance with my present Invention,
as represented at Figures 4, 5 and 6 of the annexed drawings, I make the links a,
thereof of a depth gradually increasing towards one side b, that is to say, towards
the side which the twist tends to lift off from the surface of the driving pulley.
The links a, are pivoted together in the ordinary well-known manner, that is to
Bay, by the rivets c

page_text: Having now particularly described and ascertained the nature of my Inven-
tion and in what manner the same is to be performed, I declare that what
I claim is
First. Link driving belts, the surface or surfaces of which is or are hollowed out,
that is to say, the links of which are of a depth gradually increasing in depth
from the centre towards the edges all substantially as and for the purposes
herein before set forth with reference to Figures 1, 2 and 3 of the annexed
drawings.
'
Second. Half twist link driving belts, constructed with their links of a depth
gradually increasing towards one edge thereof substantially as and for the
purposes herein before described with reference to Figures 4, 5 and 6 of the
annexed drawings.
J. H. JOHNSON, DAY & JOHNSON,
Applicant's Agents.