Improvements in Pitch or Drive and similar Chains.
Year: 1891

page_text: Date of Application, 27th Feb., 1891
Complete Specification Left, 10th Oct., 1891-Accepted, 14th Nov., 1891
PROVISIONAL SPECIFICATION.
Improvements in Pitch or Drive and similar Chains.
A communication from THOMAS MAXON, of Dayton, in the County of Montgomery
and State of Ohio, United States of America, Manufacturer.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E. do hereby declare the nature of this invention to be as follows :-
This invention relates to that class of pitch chains of which the links are usually
cast in metal the links being so arranged that while perfectly free for operation
they cannot become detached in ordinary use the detaching of them requiring
that the links should be turned over at a quite unusual angle to each other. In
carrying out this invention I prefer to make the end bar with a slight recess or flat
in the centre of it and in such a part as not to interfere with the bearing for the
contiguous link. The end of the next link is formed with a broad hook adapted to
fit the open interior of the chain and snugly surround the end bar. Inside this hook
and preferably centrally of its width is a slight projection or lug of a size adapted
to pass through the recess on the end bar and the arrangement is such that when
the links are put together at a suitable acute angle the hook can be placed upon
the end bar by reason of the lug in that position passing through the recess in the
bar, but when straightened out the links cannot be detached as the lug then fits
upon the end bar which can only pass the opening in the hook when the lug
coincides with the recess on the end bar. The breadth of the hook engaging with
the link prevents the two links moving sideways further than is desirable and as
the links cannot become detached a strong, cheap and exceedingly useful chain may
be produced.
Dated this 27th day of February 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Pitch or Drive and similar Chains.
A communication from THOMAS MAXON, of Dayton, in the County of Montgomery.
and State of Ohio, United States of America, Manufacturer.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E., 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 class of pitch chains of which the links are usually
cast in metal the links being so arranged that while perfectly free for operation
they cannot become detached in ordinary use the detaching of them requiring that
the links should be turned over at a quite unusual angle to each other. In carrying
out this invention I prefer to make the end bar with a slight recess or flat in the
centre of it and in such a part as not to interfere with the bearing for the con-
tiguous link. The end of the next link is formed with a broad hook adapted to fit
the open interior of the chain and snugly surround the end bar. Inside this hook
and preferably centrally of its width is a slight projection or lug of a size adapted
to pass through the recess on the end bar and the arrangement is such that when
the links are put together at a suitable acute angle the hook can be placed upon the
end bar by reason of the lug in that position passing through the recess in the bar,
TP21

page_text: but when straightened out the links cannot be detached as the lug then fits upon
the end bar which can only pass the opening in the hook when the lug coincides
with the recess on the end bar. The breadth of the hook engaging with the link
prevents the two links moving sideways further than is desirable and as the links
cannot become detached a strong, cheap and exceedingly useful chain may be
produced.
In the accompanying drawings
:-
Figure 1 is a face view of one of the links constructed according to this
invention.
Figure 2 represents a longitudinal section of a chain constructed according to
this invention.
Figure 3 shows two links of the chain in the position for putting together or
taking apart, and
Figure 4 shows in plan and longitudinal section one link of the chain.
Like letters represent like parts throughout the drawings.
A is the link by preference rectangular having at one end a hook or head B the
shape of which will be clearly seen from the drawings. The end bar of the link to
which the hook B is connected is flattened or reduced at A' to allow of the entrance
of the end bar A² of the next link such entrance being prevented except when the
two links are in the proper angular relation to each other by the lug or
projection B' formed on the inside of the hook B. As shown in Figure 1 the end
bars of the various links are retained in their respective hooks by these lugs B¹ so
that the links cannot be separated from each other.
A small recess C corresponding with the lug B' is formed in the end bar A² and
by putting the links in the position shown in Figure 3 so that the recess C of one
link and the lug B₁ of the next coincide it will be seen that the links can be
separated. In Figure 3 the link marked D can be drawn out from the link A. in
the direction indicated by one head of the arrow, or inserted into the link A in the
direction indicated by the other head of the arrow so that while in ordinary use
the links cannot be detached they can nevertheless be easily detached when placed
in the position shown in Figure 3. The double view in Figure 4 shows clearly the
relative positions of the recess C and the lug B' of one of the links. The hook B.
is made of such a width as to conveniently fit in the recess of the link with which it
engages.
Generally speaking these links may be made of cast metal but they may be
otherwise formed (as for example by stamping) if preferred.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondent, and in what manner the
same is to be performed, I declare that what I claim is :-
1. A detachable chain link consisting of a link head lug and recess respectively
such as A B B and C substantially as and for the purpose described and illustrated
in the accompanying drawings.
2. In a joint for a detachable chain link the combination with a link end-bar
having a recess such as C of a hook such as B having a lug such as B' substantially
as and for the purpose described and illustrated in the accompanying drawings.
3. The combination in a chain of two complete links such as A substantially as
and for the purpose described and illustrated in the accompanying drawings.
Dated 10+ don of O Jan 1801
W. P. THOMPSON & BOULT,
Agents for the Applicant.