Improvements in and relating to Machinery or Apparatus for Chamfering and Facing Screw-nuts.
Year: 1886

page_text: Date of Application, 12th Oct., 1886.
Complete Left, 28th Mar., 1887.
Complete Accepted, 17th May, 1887.
PROVISIONAL SPECIFICATION.
Improvements in and relating to Machinery or Apparatus for
Chamfering and Facing Screw-nuts.
We, RICHARD SAMUEL WOOD, of 27, Welbeck Street, Chorlton upon Medlock,
Mechanic, and ERNEST NEWMARCH DUNDERDALE of Redland Villa, Victoria Park,
Insurance Broker both of Manchester in the County of Lancaster do hereby declare
the nature of this invention to be as follows:-
This Invention relates to machinery or apparatus for facing and chamfering screw-
nuts and has for its object to effect the facing and chamfering on each side of the nut
successively without rechucking the nut, or simultaneously.
For the purpose of this Invention the nut is mounted upon a screwed mandrel, the
screwed part being of larger diameter than the rest of the mandrel and a little shorter
than the depth of the nut. Over the nut is placed a disc having a central perforation
corresponding to the dimensions and shape of the nut so that the nut may fit therein.
The mandrel is then placed between the centres of an ordinary or special lathe,
arrangements having previously been made for driving the mandrel and the disc at
equal rates so as avoid rotation of the mandrel and of the nut relatively to each other.
The nut may now be faced and chamfered on each side successively in the usual
manner, but it is preferable to face and chamfer both sides of the nut at once.
may be accomplished by employing two slide rests carrying the necessary cutting
tools; one slide rest and cutting tool or set of tools being upon each side of the nut
and disc.
This
When it is desired to bevel or chamfer the edges of the bore of the nut to remove
the burr or "arris" left at the end of the screw thread, a special device or
arrangement of the tool holder carrying the chamfering tool may be adopted so as to
enable this tool to be removed from its point of work sufficiently to enable the
finished nut to be removed and a black one to be put in its place. A convenient
arrangement or device for this purpose is to employ an L shaped tool carrier. The
extremity of one of the arms carries the tool while the other arm may be slotted
077

page_text: parallel with its length. The tool carrier is pinned or pivoted at or about the angle,
to the slide rest, and the slot encloses a bowl mounted upon a vertical pin fixed to the
bed of the lathe. When therefore, the slide rest is moved or fed parallel with the
bed, the chamfering tool moves as and with the slide rest, but when the slide is moved
to or from the centre of the lathe the tool end of the tool carrier is swung forwards or
backwards to an extent which may be governed by an adjustable stop and the position
of the bowl in the slot.
Instead of employing swinging tool carriers for the inside chamfering tools, they
may be mounted upon independent slide rests at the back of the lathe, these slide
rests being simultaneously operated in opposite directions as required.
Dated this 23rd day of September A.D. 1886.
WILLIAM E. HEYS,
Agent for the Applicants.
Improvements in and relating to Machinery or Apparatus for
Chamfering and Facing Screw-nuts.
We, RICHARD SAMUEL WOOD of 27 Welbeck Street Chorlton upon Medlock
Mechanic and ERNEST NEWMARCH DUNDERDALE of Redland Villa Victoria Park
Insurance Broker, both of Manchester in the County of Lancaster, 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 machinery or apparatus for facing and chamfering screw
nuts and it has for its object to effect the facing and chamfering on each side of the
nut without rechucking successively or simultaneously.
The accompanying drawings which are hereinafter referred to, illustrate a machine
or apparatus constructed according to these Improvements.
Fig. 1. is a front view; Fig. 2. is an end view; Fig. 3. is a front view partly in
section; Fig. 4 is a transverse section and Fig. 5 is a plan. In each of the
Figures similar letters are employed to denote similar parts.
A is the support or underframing: B B are slide rests, the slides of which may be
adjusted by screws having squares CC formed upon their ends or they may be
provided with other devices by means of which their rotation may be effected; D is a
transverse slide operated by the screw E which works in the nut F. attached to the
transverse slide; G is a handle for actuating the screw E; HH' are two headstocks
practically equivalent to the headstocks of an ordinary lathe; I is a mandrel having

page_text: a screwed head of larger diameter than the stem of the mandrel; this mandrel has its
head screwed to correspond and fit within the particular size of nut to be operated on
and the screwed part is a little shorter than the depth of the nut. K is a disc having
a central perforation corresponding to the dimensions and shape of the nut. As
represented in the drawings Figs. 3 and 4 the nut is carried in a chuck bush or
removeable piece M, this arrangement obviates a change of the dise K when the size
of the nut is altered. The disc K is concentric with the mandrel and is arranged so
that it may be rotated at an equal rate therewith. The desired rotation of the
mandrel and of the disc may be effected very conveniently by means of the two pairs
of friction pulleys N N¹ and ' N being equal to O and N¹ to 0. The friction
pulleys may be driven from the cone pulley P and may be put in gear therewith by
means of the handle Q which is connected with an eccentric, this device for pulling
the friction pulleys into gear is equivalent and similar to the corresponding device
in the back gear of a lathe. It will be seen that the friction pulley O may as
shown in the drawings be formed upon the disc K. It may be carried or borne upon
smaller pulleys or rollers arranged around its circumference or as represented it may
bear in the annular casing R, a portion of the casing being cut away to allow the
frictional surface to come into contact. S S are two curved or bent levers or tool
carriers. Each tool carrier is pinned or pivoted at T T to a pin or pivot carried by
the traversing slide D; their inner ends carry the chamfering tools U U₁ and their
outer ends engage with or are controlled by two stationary bowls, V V₁ the position
of which may be adjusted by the screw W and they may also be connected by spiral
springs to the pins T T to assist their return motion. The tool carriers SS¹ may
have the positions of their pins or pivots adjusted as may be required by the
screws XX. The sarfacing bevelling tools are carried by the tool holders in the
slide rests B B. Z is an adjustable stud or bowl which may be set nearer to or
further from the disc K. as may be required in order to bring it into contact with
the nut when the latter is in its correct position in the disc for being operated on.
By this means it may be ensured that the same amount of metal shall be taken off
each side of the nut. When one face of the nut only is required to be bevelled a
surfacing and bevelling tool or tools will be employed with one of the slide rests and
a surfacing tool only with the other. For the sake of clearness some of the parts
which would actually be in sight have been omitted from some of the figures.
In operating the machine or apparatus a mandrel I of the required size is fixed in
position; the various cutting tools are changed altered or adjusted so as to produce
their respective cuts on the nut to bring it to the desired form and dimensions; the
adjustable stop or bowl Z is secured in its proper position, and a suitable bush or
chuck for holding the nut is secured in the disc. The friction pulleys being out of
gear, the apparatus may be set in motion, when the mandrel will revolve and the disc
will remain stationary: A black, screwed nut may now be presented to the head of
the mandrel through the opening in the centre of the disc, when the screwed part of
the mandrel will engage with the thread of the nut which is prevented from rotating
by being held within the stationary disc. The nut will consequently be screwed upon
the head of the mandrel until it comes in contact with the adjustable stop Z. The
friction pulleys are then put into gear by the handle Q whereupon the mandrel with
the nut thereon, and the disc with the nut therein, are driven at the same speed.
The handle upon the screw actuating the traversing slide is then rotated so as to
bring the surfacing and bevelling tools into operation upon the nut. At the same
time, the centres of the curved or bent tool carriers S S¹ being moved with the
traversing slide, and the tails of the tool carriers being prevented from partaking in
the transverse motion by the stationary studs or bowls V V₁ the tool ends of the
carriers swing through the arcs of circles around T T until their cutting tools come
into contact with and chamfer each end of the bore of the nut. When the cuts
are completed the motion of the hand wheel and consequently of the traversing
slide is reversed and the tools are thereby removed so as to permit the withdrawal of
the nut.

page_text: It will be found more generally convenient to construct the machine or apparatus
substantially as hereinbefore described but it is obvious that the traversing slide ;
slide rests; bent or curved tool carriers, disc; mandrel; adjusting bowls; screws and
friction gear may be adapted to or be arranged or combined with an ordinary lathe.
It is evident also that various mechanical modifications of the details of the apparatus
may be effected without departing from our Invention and that some of them may be
omitted or other parts or details be added thereto as may be required under special
circumstances or conditions.
Having now particularly described and ascertained the nature of this our said
Invention and what manner the same is to be performed, we declare that what we
claim is :
(1) In a machine or apparatus for chamfering and facing screw nuts; the combi-
nation with operating mechanism of a traversing slide, a perforated disc or nut carrier,
a mandrel with an enlarged screwed head, and two slide rests, and an adjustable
stop Z, substantially as hereinbefore described and as illustrated by the accompanying
drawings.
(2) In a machine or apparatus for chamfering and facing screw nuts; the combi-
nation with operating mechanism of a traversing slide, a perforated disc or nut carrier,
a mandrel with an enlarged screwed head, one or two curved or bent and pivoted
tool carriers; two slide rests, and an adjustable nut stop; substantially as hereinbefore
described and illustrated by the accompanying drawings.
In a machine or apparatus for chamfering and facing screw nuts; a mandrel
having an enlarged screwed part or head upon which the nut to be faced or chamfered
is threaded, substantially as hereinbefore described and illustrated by the accompanying
drawings.
(4) In a machine or apparatus for chamfering and facing screw nuts, a rotatable
disc or nut carrier constructed and operated substantially as herein before described
and illustrated by the accompanying drawings.
(5) In a machine or apparatus for chamfering and facing screw nuts; curved or
bent and pivotted tool carriers constructed and operated substantially as hereinbefore
described and illustrated by the accompanying drawings.
(6) In a machine or apparatus for chamfering and facing nuts; a traversing slide
carrying two slide rests and constructed and operated substantially as hereinbefore
described and illustrated by the accompanying drawings.
Dated this 17th day of March AD 1887
WILLIAM E. HEYS,
Agent for Applicants.