Improvements in and relating to Screwing Machines.
Year: 1899

page_text: Date of Application, 2nd Aug., 1899
Complete Specification Left, 1st May, 1900-Accepted, 23rd June, 1900
We, CHARLES MCCORMAC, of 7, Holdsworth Terrace, Shaw Hill, Managing
Director, and MESSRS. G. F. SMITH, LIMITED, of South Parade, Machine Tool
Makers, both in Halifax, in the County of York, do hereby declare the nature
of this invention to be as follows:
The object of this invention is to construct an automatic, instantaneous release
motion for the die boxes of screwing machines, whereby the mechanism is more
direct and positive in its action.
Within the hollow spindle of screwing machines we mount a suitable slid-
ing rod or shaft having a disc at one end, the other being secured to a loose
boss; to this boss is hinged a fulcrum lever; to the other end of this fulcrum
lever is a sliding stud; thus stud engages intermittently with a slot in a recess
in the friction clutch of the main driving wheel.
A projection or cam is formed upon the outer face of the clutch, which
engages or strikes against an antifriction bowl upon a second sliding rod or
shaft connected with the die mechanism.
The action is as follows:-When a sufficient length of thread has been put
upon the rod or shaft, and as the same is fed through the dies, it strikes against
the disc upon the sliding bar, which, acting on the fulcrum lever, projects the
sliding stud within the recess in the friction clutch and puts the same in gear,
and as it revolves with the driving wheel the projection or cam strikes the anti-
friction bowl, moving the second sliding rod, which releases the dies from
further action.
2 1000
Improvements in and relating to Screwing Machines.
We, CHARLES MCCORMAC, of 7, Holdsworth Terrace, Shaw Hill, Managing
Director, and MESSRS. G. F. SMITH, LIMITED, of South Parade, Machine Tool
Makers, both of Halifax, in the County of York, do hereby declare the nature
of this invention, and in what manner the same is to be performed, to be parti-
cularly described and ascertained in and by the following statement:-
-
The obiect of this invention is to construct an automatic instantaneous release

page_text: motion for the die boxes of screwing machines, whereby the mechanism for
releasing the dies is more direct, positive, and automatic in its action than has
hitherto been the case in this class of machines.
DESCRIPTION OF DRAWINGS.
Fig. 1 is an elevation partly in section of the fast headstock of a screwing
machine with our improvements applied.
Fig. 2 is a plan view of the fast headstock of a screwing machine, with our
improvements applied.
Fig. 3 is a sectional view of clutch, main driving wheel and hollow spindle,
through the line A, B.
Within the hollow spindle C of screwing machines we mount a suitable slid-
ing rod or shaft D, having at one end a nxed disc E; also upon this shaft D
is a boss G having a neck F fitting within one end of the hollow spindle C, this
neck steadys or assists in supporting the rod D which is also adjustable within
the hollow spindle according to the length of screw required. Hinged upon
the boss G is a fulcrum lever H connected to a sliding spring stud J, having a
taper nose which engages with a corresponding groove K in the split arm of
a suitable friction clutch, this friction clutch L rests within a chamber formed
by the main driving wheel M and a shell or flanged disc N; on the outside face
of this disc N is formed a cam projection P, which when the shell revolves,
strikes an antifriction bowl P¹ upon a second sliding rod or bar R, connected
with the levers R and clutch of the die mechanism.
This shell N is stationary when the machine is screwing, being clear of the
main driving wheel M, and loose upon its boss, and is so held by means of a
stop or projection W engaging with a spring stud X carried by the headstock.
The sliding rod or shaft ]) is adjustable or moved within the hollow spindle C
by means of the disc T, and when the rod has been so adjusted, and the boss G
secured in the position shown, the machine is ready to commence work.
The action is as follows:-When a sufficient length of thread has been cut
upon the rod or shaft, the end of such shaft (as the same is fed through the
dies), strikes the disc E upon the sliding or adjustable rod or shaft D, causing
such rod to act upon the boss G, and fulcrum lever H which projects the sliding
stud J into the recess K in the arm of the friction clutch L, binding the said
clutch L against the flanged disc or shell N in such a manner, that as the main
driving wheel M. continues to revolve, the said shell N revolves with it, the
stop W overcoming the resistance of the spring stud X, and as the said shell
continues to revolve, the cam projection P strikes the bowl P¹ upon the sliding
bar R moving the said bar and immediately releasing the dies Z.
The clutch is released by means of the spring V upon the sliding stud, upon
the removal of the screwed rod or shaft.
The sliding bar R and dies are again set in position by the ordinary hand
lever, fixed upon the cross shaft Y, when desiring to cut another thread.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
=
1. An automatic release motion for screwing machines, consisting of an
adjustable sliding bar D, disc E, boss G, lever H, sliding spring stud J, clutch L,
shell N cam projection P', and stop W, such projection P and stop W engaging
with or acting upon at intervals the bowl P¹ and stud X respectively, in the
manner and for the purposes set forth.
2. In an automatic release motion for the die boxes of screwing machines,
the combination of an adjustable sliding rod or shaft D, upon which are mounted
disc E, and boss G, the said boss G actuating the fulcrum lever H and sliding
spring stud J, in the manner and for the purposes set forth.
3. In an automatic release motion for the die boxes of screwing machines,

page_text: the combination of a clutch L and flanged disc or shell N loose upon the boss
of the main driving wheel M, cam projection P, bowl Pi and bar R, operated
and operating in the manner and for the purposes set forth.
JOHN E. WALSH,
Waterhouse Chambers, Crossley Street, Halifax.
Patent Agent for the Applicants.
JOHN E. WALSH,
Waterhouse Chambers, Crossley Street, Halifax.
Patent Agent for the Applicants.