Certain Improvements in Machines for Making Screws by Rolling.
Year: 1895

page_text: Date of Application, 11th Jan., 1895
Complete Specification Left, 11th Oct., 1895-Accepted, 16th Nov., 1895
PROVISIONAL SPECIFICATION.
Certain Improvements in Machines for Making Screws by Rolling.
I, EPHRAIM PHILLIPS, of 54, Bissell Street, in the City of Birmingham,
Screw Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention consists of the hereindescribed improvements in machines for
making screw threads on screw blanks by rolling, the said machines being of that
class in which the screw blank is operated upon by three screw threaded rollers
which are arranged around the blank and revolve on their axes and are pressed
against the blank so as to cause the latter to revolve and form the necessary screw
thread upon it.
By my invention .the construction of the said machine is
considerably simplified and the screw blanks can be threaded and turned out very
quickly. My invention is applicable more particularly for making screws for
screwing into metal but it can also be adapted for wood screws.
In carrying out my invention I provide three small spindles each of which
carries one of the screw threaded rollers which operate on the screw blank. These
spindles are arranged at equal distances apart around a centre which is the centre
of the screw blank. At the back ends these spindles are carried by bearings in a
head-stock and at the front ends they are carried in movable bearings in the frout
of the head-stock arranged in radial guides and outside the bearings there is a ring
made with inclines and provided with a lever by which when the ring is turned in
one direction the inclines act upon the bearings and force the spindles and their
rollers inwardly towards each other to operate on the screw blank and when the
ring is turned in the opposite direction the spindles and bearings move outwardly
Rotary
to allow of the insertion of an unscrewthreaded blank between them.
motion is communicated to these spindles by means of a hollow spindle within
which the said three spindles are situated and which is mounted to revolve in
bearings in the said head-stock and at one part is provided with an internal toothed
wheel which gears with smaller toothed pinions arranged on the said three spindles.
The longitudinal adjustment of the said small spindles is obtained by means of
three set screws one for each spindle arranged in the head-stock at the back ends
of the spindles. The said three screw roller spindles are not parallel with each
other but are slightly inclined from the back towards the screw blank that is to say
the screw roller ends of the three spindles are nearer together than are their other
ends which turn in the fixed bearings. Each of the screw rollers is fixed on its
corresponding spindle and has formed on its periphery a screw thread of the proper
angle and pitch to form the required screw thread on the blank.
a
The machine above in part described operates as follows:-The hollow spindle
having been caused to revolve by a pulley mounted thereon or by gearing or by
other means its rotary motion is transmitted to the three roller spindles and their
rollers which all revolve in the same direction. By turning the said ring through
small angle the screw rollers are separated and a screw blank is inserted between
them and then by turning the ring in the opposite direction the screw rollers are
pressed upon the blank which then commences to revolve and the screw thread is
rolled upon it and by the screw roller spindles being slightly inclined the screw
blank has a forward movement imparted to it so that as the screw thread is formed"
upon the blank the latter gradually works forward and is ultimately delivered from
between the rollers which are then separated for the insertion of another screw

page_text: blank which is operated upon as above desertbed. Thus in working the machine
the screw blanks are one at a time inserted between the screw rollers as far as is
necessary and then when these are closed upon the blank the screw thread is
formed and the screw delivered. A suitable stop limits the motion of the ring and
the distance through which the screw rollers move.
In order to deliver the screw blanks between the rollers automatically I may
arrange for the screw blanks to roll down a guide one after the other to within a
convenient distance from the screw rollers and I arrange a carrying device
consisting of a pair of fingers which by means of cams or other mechanism is
caused to take the screw blanks one at a time and carry the blank forward and
insert it between the screw rollers and then release it and move back for another
screw blank whilst that which is between the screw rollers is being screw threaded
and delivered. The ring which acts upon the bearings of the small spindles and
moves the rollers nearer together or farther apart as stated above may be operated
by an eccentric from a revolving shaft or by other means so as to make the machine
work automatically.
Dated this 10th day of January 1905
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.
Certain Improvements in Machines for Making Screws by Rolling.
I, EPHRAIM Phillips, of 54, Bissell Street, in the City of Birmingham,
Screw Manufacturer, 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 consists of the hereindescribed improvements in machines for
making screw threads on screw blanks by rolling, the said machines being of that
class in which the screw blank is operated upon by three screw threaded rollers
which are arranged around the blank and revolve ou their axes and are pressed
against the blank so as to cause the latter to revolve and form the necessary screw
thread upon it.
By my invention the construction of the said machine is
considerably simplified and the screw blanks can be threaded and turned out very
quickly. My invention is applicable more particularly for making screws for
screwing into metal but it can also be adapted for wood screws.
I will describe my invention by referring to the accompanying drawings on
which
Fig. 1 is a front view of a screw making machine constructed according to this
invention; Figs. 2 and 3 are respectively a side and a back elevation of the same;
Fig. 4 is a back sectional elevation on line X X of Fig. 2;
Figs. 5 and 6 are front elevations of the said machine with the front plate
removed Fig. 5 shewing the rollers in positions which they occupy when forming
the screw and Fig. 6 shewing the rollers opened apart ready for the insertion of a
screw blank to be operated upon by them;
Fig. 7 is a longitudinal section of the said machine ;
Fig. 8 shews one of the spindles and rolls of the same separately;
Fig. 9 is a front view of the three rolls on an enlarged scale shewing how they
act upon a screw blank;
Fig. 10 is a side elevation of one of the rolls ;
Fig. 11 shews separately on an enlarged scale one of the slides which carry the
spindles and
Fig. 12 is a sectional plan of my said screw making machine with the addition of

page_text: an appliance for feeding the screw bhooks throngh the machine from the back of..
the lead stock.
The same letters of reference indicate the same parts in, all the figures of the
drawings.
Fa carrying out my invention I provide three small spindles marked
respectively A1 A2 A3 one of which is shewn separately by Fig. 8. Each of these
spindles has fixed at one end of it one of the screw threaded rollers of which there..
are three markod respectively B B B which operate on the screw blank. ...
These spindles are arranged at equal distances apart around a common centre.
which is the centre of the screw blank C. At their back ends a these spindles are
carried by bearings D in the head stock E and at their front ends a² they are each.
carried in the hearing of a separate sliding bearing block of which there are
tliree marked respectively FF2 F3 one of which is shewn separately by Fig. 11.
These bearing blocks are as shewn in Figs. 5 and 6 arranged in radial guides in a
plate G fixed to the heat stock and outside these bearings there is a ring. which
I call the gripe ring free to turn on a boss part.g of the plate and made
with inclined parts h² adapted to act upon the outer ends of the
slides FF2 F³.
i
When the ring is turned in one direction as indicated by the arrow in Fig.
the inclines act upon the bearings F F F and force the spinilles A'A A³
and their rollers. B1 B2 B3 inwardly towards each other to operate on the screw
blank C, and when the ring H is by the lever H' turned in the opposite direction
as indicated by the arrow in Fig. 6 the spindles A¹ A² A³ and bearings FFF
are moved outwardly to allow of the insertion of the screw blank C between thein.
The outward movement of the rollers B B B as aforesaid is accomplished by:
small springs 11 12 13 which connect the slides F1 F2 F3 to the front plate J which!
latter is secured to the boss part of of the plate G to keep the slides F F F³ in
position.
Rotary motion is communicated to the spindles A1 A2 A3 by means of the
hollow spindle K. turning in bearings ee in the head stock E and provided with
a band pulley for the driving band. Within the hollow spindle K the three.
small spindles A1 A2 A3 are situated and at one part this hollow spindle K is
provided with an internally toothed wheel which gears with smaller toothed
pinions a³ a as (see Fig. 4) arranged respectively on the three spindles A¹ A* A³.
The longitudinal adjustment of the small spindles A1 A2 A3 is obtained by means
of the three set screws L1 L2 L³ one for each spindle arranged in the head
stock at the back ends of the spindles. The three roller spindles A A A³ are
(as will be seen by Fig. 7) not parallel with each other but are slightly inclined
from the back ends a¹ to the screw roller ends B1 B2 B3, that is to say, these
latter are rather nearer together than are the other ends of the spindles which turn
in the fixed bearings D. Each of the screw rollers B₁ 132 B³ is fixed on its corre-
sponding spindle and has formed on its periphery a screw thread of the saine
angle and pitch as the required screw thread on the blank but of the opposite
hand, that is to say, if the screw thread on the blank is required to be right
hand then the screw thread on the rollers B1 B2 B3 must be left hand. Similarly
if a left hand screw thread is required on the blank then the screw threads on
the rollers B B2 B3 must be right hand.
The machine above in part described operates as follows:-The hollow spindle K
having been caused to revolve by a band on the pulley k¹ or by other means, its
rotary notion is transmitted to the three roller spindles A¹ A² A³ and their
rollers B B2 B3 which all revolve in the same direction. By turning the gripe
ring H through a small angle the screw rollers B' B2 B3 are separated as shewn in
Fig. 6 and a screw blank C is inserted between them and then by turning the
ring H in the opposite direction as indicated by the arrow in Fig. 5 the screw
rollers B B B are pressed upon the blank C which then commences to revolve and
the screw thread is rolled upon it and by the screw roller spindles A' A² A³ being
slightly inclined towards the blank as above described the screw blank C has a
F

page_text: forward movement imparted to it so that as the screw thread is formed upon the
blank C the latter gradually works forward and is ultimately delivered from
between the rollers B1 B2 B3 which are then separated for the insertion of another
screw blank which is operated upon as above described. Thus in working the
machine the screw blanks are one at a time inserted in the direction shewn by
the arrow in Fig. 7 between the screw rollers B1 B2 B3 at the front of the machine
as far as is necessary and then when these are closed upon the blank as above
described the screw thread is formed and the screw delivered. The stops M¹ M²
coming in contact with the projectious * h on the ring H limit the motion of the
saine and the distance through which the screw rollers move.
The ring H which acts upon the bearings FF2 F3 of the small spindles A' A² A³
and moves the rollers B1 B2 B3³ nearer together or farther apart as stated above, may
as will be readily understood without a drawing be operated by an eccentric from
a revolving shaft or by other means so as to make the rollers B1 B2 B3 advance
and retire automatically.
When operating on screw blanks which are made without heads and are screw
threaded from end to end these may be fed in between the rollers B1 B2 B3 one
after the other from the back end of the machine along a central tube N (see
Fig. 12) arranged in the centre of the hollow spindle K so that in this case the screw
blanks will pass along the tube N in the direction of the arrow in Fig. 12 and
between the rollers B1 B2 B3 and be delivered screwed at the front of the machine.
The lever handle O (see Fig. 12) can conveniently be arranged to push the screw
blanks forward.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
1. In a machine for making screws by rolling, the combination of the three
inclined spindles A' A2 A3 provided with screw threaded rollers 131 B2 B3 at one
end of the same inclination and pitch as the required screw thread but of the
opposite hand, the adjusting screws L1 L2 L³ at the back end of the spindles for
adjusting the same longitudinally, the hollow spindle K mounted to revolve in the
head stock and surrounding the spindles A A2 A3 and provided with the internal
toothed wheel gearing with the small spur pinions a³ a as on the said spindles so
as to cause them to revolve all in the same direction, the slides F1 F2 F3 carrying
the front end portions of the spindles, the gripe ring H carried by said head stock
and surrounding the slides FF2 F3 and provided with operating lever and made
with inclines ¹³ ³ to act upon the slides when the gripe ring is turned in one
direction so as to force the rollers on to the screw blank and cause the same to
rotate and be screw threaded and gradually delivered from between the rollers,
said inclines also allowing the slides to move the rollers apart when the gripe ring
is turned in the opposite direction, all substantially as hereinbefore set forth and
illustrated by the accompanying drawings.
2. The combination and arrangement of parts forming the improved machine
for making screws by rolling herein described and illustrated by the accompanying
drawings.
Dated this 10th day of October 1895.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.