Improvements in Pitch Chains for Driving and other similar Purposes.
Year: 1896

page_text: Date of Application, 13th Aug., 1896
Complete Specification Left, 13th May, 1897-Accepted, 10th July, 1897
PROVISIONAL SPECIFICATION.
Improvements in Pitch Chains for Driving and other similar Purposes.
HENRY STODDARD BISHOP, Enginear Inglewood, Belvedere Park, Erith
Kent and CHARLES SALMON Inspector of Machinery R.N. Thames View Erith
Kent, do hereby declare the nature of this invention to be as follows:-
The object of our invention is to provide a pitch chain of simple and strong
construction and easy of manufacture, for driving and other purposes, such as
rotary or semi rotary movements, over sprocket wheels, chain drives in place of
leather or other belts, and for sustaining counter balance weights, or any similar
and obvious purpose for which such a chain is suitable.
The chain links are constructed for preference of any ductile material, such as
mild steel, but they can if desired be of cast material such as maleable cast iron,
bronze alloys, or steel.
Referring to accompanying drawing, where a small piece of chain is shown,
the links are supposed to be constructed out of sheet or strip material, stamped
or cut out to desired figure aud then folded as shown in Fig. 5 and Fig. 6. In
Fig. 5 the link is purposely left slightly open at A to show the idea of the folding
more distinctly. The circular opening at B may of course be varied in shape to
suit any reasonable form of tooth on wheels over which chain may pass or hang.
Referring now to Figs. 1 and 2 which are respectively elevation & plan of a
small piece of chain assembled from units as shown in Figs. 5 and 6, the manner of
assembling the chain is shown by Figs. 3 and 4.
The link is placed as shown in plan Fig. 4, and then turned in the direction of
the hands of a clock. It is of course obvious, that the links can be put in turning
in the opposite way if desired, according to the manner in which it is offered to its
neighbouring link. The links for any given size of chain will be all interchange-
able for that given size.
COMPLETE SPECIFICATION.
Improvements in Pitch Chains for Driving and other similar Purposes.
We, HENRY STODDARD BISHOP Engineer, Inglewood, Belvedere Park, Erith,
Kent, and CHARLES SALMON, Inspector of: Machinery, R.N. of Thames View, Erith,
Kent, do hereby declare the nature of this invention and in what manner the same
is to performed to be particularly described and ascertained in and by the following
statement:-
The object of our invention is to provide a pitch chain of simple and strong

page_text: construction easy to manufacture for driving and other purposes, such as
rotary or semi-rotary movements, over sprocket wheels, chain drives in place of
leather or other belts, and for sustaining counter-balance weights, or for any
similar and obvious purpose for which such a chain is suitable.
Figure 1 is a plan showing a chain link blank.
Figure 2 is part elevation and part perspective view of a small piece of chain.
Figure 3 is a plan thereof.
Figure 4 is an elevation and
Figure 5 is a plan of a single link.
The links are in the present example made of sheet or strip metal stamped or
cut to the shape shown in Figure 1. The two ends A A¹ are formed in such
manner as to form the pivot, see also Figures 2, 3, 4 and 5, when the link is bent
over on the imaginary line B B (Figure 1) to assume the form shown, for instance
in Figures 4 and 5. There is also stamped a round or other shaped hole C, if the
chain is to be used for chain driving to take the sprockets of a chain wheel, and
there is also made a large hole D to permit the entry of the pivot ends A A' as
illustrated by the Figures 2 and 3 and this hole also allows the sprocket to pass
through if necessary. In Figure 4 the link is shown purposely left slightly open
between the ends A and A' as this ensures that the said ends shall be prevented from
rattling in their bearings in the next link when slack and shall also fit better
besides which it is more easy to make the link with the ends slightly open as shown
than quite close together. Figures 2 and 3 clearly show the method of attaching
one link to another. The link is put in the hole D perpendicularly to the end link
of the chain and when in such position is given a twist so as to bring the links
properly in line.
The link is then turned down in line with the end link as shown, for instance,
by the other links. If it be desired to remove a link the same process is carried
out in the reverse way.
The aforesaid chain links are constructed by preference of any ductile material
such as mild steel, but they can if desired be of cast material such as for instance
malleable cast iron, bronze alloys, or steel.
It is evident that the links may be made in various sizes and that the links of any
chain will all be made uniform and that all the links of any given chain will
consequently be interchangeable.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. A chain made of links, each link consisting of a body part having pivot ends
and having also a hole therein for the insertion of the pivot ends of the next link,
substantially as described.
2. A chain made of links, each link consisting of a body part having pivot ends,
having also a hole for the insertion of the pivot ends of the next link and a hole
adapted to fit over the sprocket of a sprock wheel, substantially as described.
3. A chain made of links, each link being made of sheet metal or a strip of metal
fashioned and bent to form a body part having pivot ends, and having also a hole
for the insertion of the pivot ends of the next link substantially as described.
4. The construction of chain as described and shown on the drawing.
Dated this 19th don of M
1007
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.