Improvements in and relating to Bolt Belt Fasteners.
Year: 1897

page_text: Date of Application, 23rd Sept., 1897
Complete Specification Left, 23rd June, 1898-Accepted, 30th July, 1898
Improvements in and relating to Bolt Belt Fasteners.
I, ISAAC JACKSON of Glossop in the County of Derby, Belt Fastener Manufacturer,
do hereby declare the nature of this invention to be as follows:―
This invention relates to that type of belt fastener in which a bolt or a screw
and a nut are employed to make the joint, and its objects are to make the fastener
more compact so as to avoid risk of its striking or catching any-thing which may be
near the running belt in which it is used, to ensure a firmer grip upon the belt, and
to increase the efficiency of the fastener generally.
•
With the fasteners referred to a convex washer or bolt head is employed on one
side of the belt and a concave nut on the other side so that the belt is forced out
of its plane into a flattened dome shape between the nut and washer.
On the inner
surface of the nut, that is to say on its concave side, a tubular bored extension is
formed which passes through a central hole in the belt and is internally screwed so
as to form the nut thread. The nut itself is of relatively large diameter, convex on
the outer surface, and rounded or turned up at the edge to prevent cutting the
belt.
For turning the nut I employ special devices. Through the substance of the nut
I produce a plurality preferably two, four, or eight, small holes parallel with the axis
of the bolt. The nut can then be turned by means of a key having a dished end to
fit upon the convexity of the nut and being provided with a plurality of pins projecting
therefrom in such a manner as to fit into all or some of the holes in the nut.
Dated this 22nd day of September A.D. 1897.
COMPLETE SPECIFICATION (AMENDED).
Improvements in and relating to Bolt Belt Fasteners.
I, ISAAC JACKSON of Glossop in the County of Derby, Belt Fastener Manufacturer,
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 that type of belt fastener in which a bolt or a screw and

page_text: a nut are employed to make the joint,. and-its-objects-are-to-make-the-fastener
more-compact-so as to avoid risk of its striking on-catching-anything-which-may-be
near-the-running-belt-in-which-it-is-used;-to-ensure-a-firmer-grip-upon-the-belt, and
to-increase-the-efficiency of the fastener generally:
With the fasteners referred to, a convex washer, or its equivalent, the convex
underside of the bolt head, is employed on one side of the belt, and a concave nut on
On
the other. a-similarly shaped-washer-being-placed-under-the-nut-it-desired.
the inner surface of the nut, that is to say on its concave side; a tubular bored ex-
tension is formed which passes into the substance of the belt. or-through-the-hole in
the-nut-washer-when-this-is-used.. This tubular extension is tapped to form the nut
thread. The nut itself is of relatively large diameter, convex on the outer surface;
and rounded or turned up at the edge to prevent cutting the belt,. especially--when
no washer-or-plate-is-used-under-the nut.
For turning, the nut I employ special devices. Through the substance of the nut
I produce a plurality preferably, two, four, or eight small holes parallel with the axis
of the bolt. The nut can then be turned by means of a key, having a dished end to
fit upon the convexity of the nut, and being provided with a plurality of pins pro-
jecting therefrom in such a manner as to fit into all or some of the holes in the
nut.
In order that my invention may be more easily understood I have hereto appended
a sheet of drawings to which I will hereinafter refer, and which illustrate a fustener
and various-modifications of the improved belt fasteners-and the devices for turning
the nuts,. similar-letters being used to indiente similar-parts-where-they-occur-in-the
different-Figures.
Figure I illustrates in section a lap joint made with the improved fastener. A is.
the bolt or screw the head B of which is convex or coned on its inner surface. C is
the nut, concave on its inner face, and formed or provided with a tubular extension
D, which is tapped with a screw thread to fit upon the bolt A. E are holes formed through
F
the nut and adapted to be engaged by keys which will be hereinafter described.
and G are ends of the belt, which, it will he observed are forced out of their plane
into a dome shape between the bolt head and the nut,
Figures-2-and-3 represent-respectively-a-section-and-a-plan-of-a-similar-lap-joint,
but-in-this-ease-a-convex washer H is interposed between-the-bolt head-and the sur-
face-of--the-belt. Either this-washer, or the inner-face-of-the-bolt-head-when-used
without-a-washer-may-be-formed-with-spikes--projections-or-the-like-to-engage-with
the-substance-of-the-belt-and-prevent-turning when-the-nut-is-being-serewed-up-or
unserewed. When-the-washer is used-the-bolt-head may be engaged-with-it-for-a
similar purpose-in-any-suitable-manner, as, for instance, by forming-the-unserewed
part-of-the-bolt-non eirenler in section-and-passing-it through a similar-hole-in-the
washer. The edges of the nut C-are-rounded or-turned-up-so- that there is no risk
of-cutting-the-belt.
Figures-4-and-5-are-illustrations-of-a-section-and-plan-ot-a-lap-joint-similar-to
those before described;-but-in-this-ease-a-washer-or-plate-J-is--placed-between-the
This-washer--corresponds--to-the-shape-of
nut-C-and-the-upper-surface-of-the-belt.
the-nut-and-is-also-eoneave-on-its-inner-surtace. It-may-fit flat-against-the-surface
of-the-nut,-or--it-may-be-formed-with-a-concentric groove--or-recess-K-as-shown
which-comes-below-the-path-of-the-holes E-and-permits-the-spikes-or-projections-of
the-key-to-be-properly entered into the nut. 4
1
i
Although-the-drawings-have-so-far-only-illustrated lap-joints-in-one-of-which-ne
washer-is-used,--and-in-the--two-others--a--top--and---a-bottom-washer-are--used
respectively, it-will-be-understood that both-top-and-bottom-washer-may-be-used-in
the-same-joint-if-desired.
Figure 6-shows-in-section-an-end-to-end-or-butt-joint-made-by the aid of these
improved-fasteners: The-ends-of-the-belt-are- laid- together as shown; and a twe
ended-washer-or-bridge-plate-I-is-laid-across-the-ends. The-ends-of-the-plate-are
se-formed-that-they-adapt themselves-to--the nuts--C-in-a-similar manner to-the
/ 4
รา

page_text: single-washer-J-before-described: The-bolts-pass-through-the-substance-of-the-belt
and-are-engaged-by-the-nuts-as-shown.
Figure
7-illustrates-a-similar-section-of-a-butt-joint,-but--in-this--ease-washers-H
are-placed-under-the-bolt-heads.
The two-ended-plate-L-may-also,-if-required,-be-formed-with-grooves--or recesses
as-indicated-by-the-letter-K-in-Figure-4.
Figure-S-is-a-representation-of-a-plan-of-u-butt-joint, two-of-the--plates-L-being
employed, although-any-smaller-or-greater-number--may--be-used--aecording-to-the
width-of-the-belt.
In Figure 29 is illustrated in plan, and partly in elevation and partly in section, a
two ended key adapted to engage with two different sizes of nuts." Each end of the
key M is cupped or made concave to correspond with the outer surface of the nut, is
perforated at N for the passage of the screw, and is formed on its concave surface with
pins, projections or the like O, adapted to engage with the holes E in the nuts and
thus serve to rotate them.
Another form of key M is similarly illustrated in Figure 3 10. This key, in
addition to being double ended, is double faced, that is, on each side at each end, it
is formed with a concavity from the surface of which projects spikes or the like O.
Either of these patterns of keys may, however, be single ended.
The-plates-L-shown--ih-Figures-6,-7-and-8-may-be-formed-on-their-side--edges
with-central-nibs-or-projections-or-be-otherwise-marked-so-as-to-indicate-when-they
are-placed equally-over-the-two-ends-of-the-belt.
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. In-a-bolt-belt--fastener;-a-nut,-concave--on-its-inner--surface, convex-on-its
enter-surface,-rounded-at-its-edges,-formed-with a tubular--serewed--extension,-and
and-as-illustrated-by-the-accompanying-drawings.
perforated-to-engage-with-a-key,-arranged--substantially-as--herein
before-described
2. A-belt-belt-fastener provided-with-a-nut-constructed--and--arranged substan-
tially-as-hereinbefore-described-and-as-illustrated-by-the-accompanying-drawings.
3. A-belt-belt-fastener-eenstructed--and--arranged--substantially-as-hereinbefore
described-and-as illustrated-by-the-accompanying-drawings.
4. A key for use with a bolt belt fastener of the type set forth, having one or both
of its ends formed with one or more concavities from the surface or surfaces of which
project spikes, pins or the like, to engage with holes formed in the substance of the
nut, substantially as herein before described and as illustrated by the accompanying
drawings.
1000