IMPROVEMENTS IN MACHINERY FOR MOULDING TOOTHED WHEELS AND OTHER CIRCULAR ARTICLES
Year: 1875

page_text: LETTERS PATENT to James Cuthbert Scott, of Manchester, in the
County of Lancaster, Engineer, for the Invention of "IMPROVEMENTS
IN MACHINERY FOR MOULDING TOOTHED WHEELS AND OTHER CIRCULAR
ARTICLES."
Sealed the 13th July 1875, and dated the 15th January 1875.
PROVISIONAL SPECIFICATION left by the said James Cuthbert Scott
at the Office of the Commissioners of Patents, with his Petition,
on the 15th January 1875.
I, JAMES CUTHBERT SCOTT, of Manchester, in the County of Lancaster,
5 Engineer, do hereby declare the nature of the said Invention for "Iм-
PROVEMENTS IN MACHINERY FOR MOULDING TOOTHED WHEELS AND OTHER CIRCULAR
'ARTICLES," to be as follows:-
#
: My Invention refers to an arrangement wherein a trammel is
employed for carrying a segmental portion of the pattern required for
producing the toothed wheel or other circular article. Upon a stationary
pillar I mount a cap capable of being turned thereon, and within it I
form a chamber for the reception of the trammel which is capable of

page_text: being moved inward or outward by a traversing screw or similar means.
Upon the aforesaid cap is formed a worm wheel, in gear with which is a
worm carried by a bearing fixed to the aforesaid stationary pillar which
also carries the usual dividing plate, and between these two parts is the
necessary gearing for adapting the change wheels, the whole being
adapted to the said fixed pillar and therefore independant of the radial
motion of the trammel. Upon the friction pillar I adapt a friction
break, which when put in force confines the said cap and therefore the
trammel to its proper position when brought thereto by the gearing.
The segmental pattern may be adapted and moved. upward and down-
ward by any ordinary means, but I propose to provide it with projections
corresponding in their distances apart to the pitch of the wheel to be
moulded when such article is to be produced, and these projections being
caused to move into each others impressions show whether the diameter
arranged for is correct. This improvement in the segmental pattern is-
applicable to other arrangements. in which such moulding apparatus is
employed, and the same remark applics to the friction brake above
mentioned.
t
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Cuthbert Scott in the Great Seal Patent
Office on the 15th July 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
CUTHBERT SCOTT, of Manchester, in the County of Lancaster, Engineer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fifteenth day of January, in the year of
our Lord One thousand eight hundred and seventy-five, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and succes-
sors, give and grant unto me, the said James Cuthbert Scott, Her
special license, that I, the said James Cuthbert Scott, my executors,
administrators, and assigns, or such others as I, the said James Cuthbert
·Scott, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time, and at all times there-
after during the term therein expressed, should and lawfully might

page_text: projecting into grooves 18, the box 3 and trammel 6 are prevented from
rising. Upon the periphery of the box 3 is formed a ring of teeth 20, in.
gear with which is a worm 21 on a shaft 22, the axis of which is con-
nected to the usual change gearing 23 and notched plate 24; but
according to my Invention these parts are not mounted upon the
trammel but are carried by brackets which extends from the pillar 1.
During the operation of moulding a wheel the handle 24* is turned, and
this through the gearing connected therewith gives motion to the
worm 22, which by acting upon the ring of teeth 20 turns the box 3.and
trammel 6 round through the required space, and the other operations
are conducted as usual. It will thus be seen that the trammel does not
carry the usual gearing, and by removing the cap of the box it may be
lifted out at pleasure.
Another part of my Invention is designed to prevent inaccuracy of
moulding should the diameter represented by the radius of the trammel
be not strictly correct in reference to the change wheels employed. For
this purpose I provide the part which carries the segmental pattern with
projections corresponding in their distances apart to the pitch of the
wheel to be moulded when such an article is to be produced, and by
these means I can avoid the use of the change wheels ordinarily
employed. This improvement is shewn in the detached views, Figs. 5, 6,
7,8. At 30 is the part which carries the segmental pattern 31 and 31*,
and on one side thereof is the half of a tooth 32, and on the other side a
second half tooth 32*, both of these parts being of comparatively short
depth. For simplicity of explanation of the use of this apparatus let it
be supposed for the moment that the space 33 having been moulded the
trammel is turned round by hand after the pattern has been lifted until
the part 32 corresponds with the surface of the moulded space 33, then
it will have been ascertained that the segmental pattern has passed
through the proper distance for the moulding to be continued, and this
might be done for every tooth; but as a means of facilitating the
operation I now refer to Figs. 7 and 8. At.22 is the worm marked by
the same number of reference in the before alluded to Figs., and upon
the axis thereof is a pulley handle 34, the crank of which works in close
proximity to a fixed plate 35 with one notch formed therein (or there
might be the usual number of notches) and with surface divisions around
the other part of its circumference. Starting for the first time at the
aforesaid notch and by turning the said pulley handle the trammel, as

page_text: before described, is caused to turn upon its centre until it has been found.
(as mentioned above) that the short half tooth 32 corresponds to the
moulded part 33. This being a proof that the right position has been
attained for a continuance of the moulding, that operation may proceed
in the ordinary manner, but to facilitate the moving of the trammel for
the future part of the moulding through the correct distance the
workman makes a temporary mark upon the division of the plate 35.
corresponding to the position of the winch handle 34, and noting the
number of turns he has had to make he will know exactly when he has
brought the segmental pattern to its proper position. It will thus be
observed that the use of change wheels with their attendant dis-
advantages for a fixed radius is avoided. The use of the second half
tooth 32* is simply for registering the position of the last moulding..
This part of my Invention is applicable to moulding machines generally
in which a trammel is used.
Having thus described and ascertained the nature of my said Inven--
tion, and the manner in which the same is to be performed, I desire it.
to be understood that I claim as secured to me under the above in part.
recited Letters Patent and for the purposes above set forth,-
Firstly. The use of the trammel revolving upon a pillar which carries
the gearing necessary for imparting motion thereto.
Secondly. In reference to Figs. 5 and 6 the use of the parts 32, 32*,
or of one of them.
In witness whereof, I, the said James Cuthbert Scott, have here-
thin Tauntonth