IMPROVED DETACHABLE PITOH COMPOUND DRIVING CHAINS AND WHEELS FOR THE SAME
Year: 1887

page_text: Date of Application, 9th Sept, 1887
Complete Specification Left, 9th June, 1888
Complete Specification Accepted, 31st Aug., 1888
I WILLIAM WOOLLASON of No. 6 Pelham Cottages Pelham Street in the City
of Lincoln Engine Fitter do hereby declare the nature of my invention for IMPROVED
DETACHABLE PITOH COMPOUND DRIVING CHAINS AND WHEELS FOR THE SAME to he
as follows:
A Pitch chain is to be constructed and put together by means of alternate links one
having a double headed pin E at either end as shown by section 1 on the drawing
and the other link being composed of two parts each of which has a slot with an
outside rabote (marked "C" on Section 2 of the drawing) inserted in it; in or near
the centre of the slot C, is a round or other shaped hole "B" cut out to receive the
pin heads of the first link. The pins on the first link after passing through the holes
in the second link are drawn up the slot to the bearings marked "D" and shown by
sections 3 and 4 on the drawing. The inserted links are marked A³ in sections 3 and 4
in the drawing. Separate detached pins may be used.
The chain is completed and made endless by the final link being fitted with a pin
marked P on section 4 of the drawing having a right and left handed screw to insert
in the eyes of the preceeding link or a rivet may be used.
The chain may be made in any kind of metal or of leather india rubber or
gutta percha.
The pulley "section 5 and 6" on the drawing is toothed with wood cogs or teeth
dovetailed or inserted in the iron centre of the pulley so that these can readily be
removed or replaced. The use of the wood teeth or cogs in the pulley being to
make the chain work as silently as possible.
An octagonal hexagon or other shaped wheel may be used as
the chain.
GENERAL REMARKS.
a
pulley for
The invention is for facilitating the putting together of, or detaching the links from,
a Pitch chain and also for constructing such a chain in a strong and safe manner by
means of separate pieces of stamped or cast material of an inexpensive character.

page_text: I WILLIAM WOOLLASON of No 6 Pelham Cottages in the City of Lincoln Engine
Fitter do hereby declare the nature of my invention for IMPROVED DETACHABLE PITCH
DRIVING CHAINS AND WHEELS FOR THE SAME and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement :-
My invention relates to an improved construction of a Detachable Pitch driving
chain and wheels for the same having for its object an easy and safe mode of
adjustment.
First. Fig. 1 (sections 3 and 4) shows a Pitch chain constructed and put together
by means of alternate links one having a double headed pin "E" at either end as
shown by section 1 on the drawing and the other link (section 2) being composed of
two parts each of which has a slot (with an outside rabot if required) marked "C" on
such section inserted in it. In or near the centre of the slot "C" is a round or other
shaped hole "B" cut out to receive the pin heads of the first link.
The pins on the first link after passing through the holes in the second link
are drawn up the slot to the bearings marked "D" and shown by sections 3 and 4
on the drawing.
The inserted links are marked A' in sections 3 and 4.
Second. Fig. 2 shows a plain view of a link (forked shaped) having a rounded head
or boss with two parallel sides.
Fig. 3 is an end elevation of the link in which a round hole "6" is inserted through the
head or boss and holes "B" are also inserted through each of the sides of the link. A slot
or groove "C" is made or cut from the lower sides of the holes "B" to a sufficient depth
to allow a loose Pin (Fig. 4) to fall into position. A pitch chain is then made up of the
links which are fastened together by means of the Pin (Fig. 4) which is cut or shouldered
down near each end to fall into the slots or grooves in the sides of the link the pin
being slightly less in diameter than the holes "b" "B" (in the head and side of each
link) is passed through the round hole in one side of a link B' then through the head
of another link (held at an angle to allow of the holes being exactly opposite each
other) and brought out the hole in the opposite side of the first link. The two links
are then fastened together by the flat shoulder in the pin being drawn down the slots or.
grooves (made to receive it in the sides of the links. The links will then readily
move as on a hinge and can be detached by again bringing the pin into such a position
that it will pass through the holes in the sides and heads of the connected links.
the above case heads at the end of the pin are dispensed with.
In
Third. In a similar way a detachable chain can be constructed with simple discs or
bars of metal or other material slotted from centre to ends as shown in section (2)
having a round hole "B" midway (or near midway) between the ends of the slot in
each disc or bar. The discs or bars can be coupled and formed into links by passing
loose round pin (E' (Fig. 5) with a head "e") through three or more of them and
a

page_text: these discs by being drawn alternately on the pin to the full extent of their slots will
form a complete coupled chain (Fig. 6) which can be used as a Pitch chain and also
as a driving band by being run on its edges over a pulley. The pin E2 in this case
will not require to be shouldered or cut but the discs or bars can be rabotted or
recessed if necessary.
The pulley (Section 6) is toothed with cogs or teeth of wood or other material
dovetailed or inserted in the side of the pulley so that these can be readily removed or
replaced. The pulley can also be made adjustable by means of having an eccentric
inserted in it as shown in the drawing.
The use of the eccentric used in the wheel is for the purpose of taking on or off or
slacking or tightening the pitch chain without difficulty.
The eccentric is held in position by bolt marked "G" inserted through it and by
this means the axis of the wheel is kept in the true centre of the spindle but by
removal of bolt the axis of the wheel is thrown out of centre and any chain or belt
running over the pulley is at once slacked so as to be removed.
Having now particularly described and ascertained the nature of my invention
and in what manner the same is to be performed I declare that what I claim is
1. The construction of a Pitch Chain by means of links made either in one or more
piece or pieces having holes and slots in each so arranged for the insertion of a pin to
hold them together on the principle substantially described and specified.
2. The use of a slot in the side or sides of the links of a chain in addition to or in
connection with the hole through which the pin is to be inserted for connecting the
chain together substantially as described.
3. The use of a loose pin to connect the links on the principles substantially as
described and specified.
4. The construction of a pulley toothed with cogs dovetailed or inserted to be
readily removeable and adjustable by means of an eccentric substantially as described
and specified.
Dated this Eighth day of June 1888.