Improvements in Machinery for Tapping or Forming Screw Threads in Nuts.
Year: 1890

page_text: Date of Application, 24th Nov., 1890
Complete Specification Left, 20th Aug., 1991-Accepted, 10th Oct., 1891
PROVISIONAL SPECIFICATION.
Improvements in Machinery for Tapping or Forming Screw Threads
in Nuts.
I, JAMES HOLLINGWORTH, of Dobcross, in the County of York, Power Loom
Maker, do hereby declare the nature of this invention (the said invention being
a communication to me from abroad by George Webb, of Pawtucket, Rhode
Island, one of the United States of America, Engineer,) to be as follows
:-
This invention has reference to machinery for accurately and expeditiously
tapping or forming screw threads in nuts.
In carrying out my invention I employ revolving horizontal spindles, one end of
which is prepared to receive the tapping spindle which forms the thread within the
mut. The nut to be tapped is placed in a recess on the moving head so that it
cannot revolve, which head, together with the nut, is caused to travel towards the
revolving tapping spindles by means of a spiral or other form of spring for the
purpose of feeding the nut over the screwed tap spindle, which nut is thereby
tapped, and when the said nut arrives at the end of the screwed portion of the
revolving tapping spindle, the moving head, by reason of the spiral or other spring,
pushes the said nut onto the plain or shank part of the tapping spindle, after which
the operative draws back the sliding head by means of a lever or handle and places
another untapped nut into the recess previously mentioned, when the spring forces
the nut over the screwed spindle, which nut the moving head pushes onto the blank
part of the tapping spindle, and this goes on, one nut after another, until the plain
part of the tapping spindle is filled with tapped nuts, when it is withdrawn from its
position for the purpose of emptying them into a shoot made in the framework or
other convenient place. A series of revolving tapping spindles and moving heads
may be arranged side by side, so that large numbers of nuts can be tapped at the
same time. Suitable arrangements of vessels and pipes are employed, in connection
with an oil vessel, the oil being forced therethrough by means of a suitable form of
pump, for lubricating the tap while the nut is being tapped, such oil escaping
therefrom into the receiver from which the oil is pumped, whereby the oil is being
continuously re-used. The pump is driven from the machine, so that the oil
commences to run when the machine is set in motion, and ceases when the machine
stops, consequently the oil is not running when the machine is not working, neither
is the turning on or turning off of the oil left to be done at the discretion of the
operative.
The nut to be tapped rests on the point of a set screw in the recess formed in the
sliding head, which ensures the hole of the nut coming exactly opposite the centre
of the revolving tap, which set screw can be adjusted in its height when required,
which will happen in course of time by the point of the screw wearing away. The
nut, however, may rest upon a solid bottom, or other method may be employed for
adjusting the position of the nut.
Doted this Dond dovy of November Losû.
TASKER & CROSSLEY,
Halifax and Huddersfield, Agents.

page_text: COMPLETO SPECIFICA LIV
Improvements in Machinery for Tapping or Forming Screw Threads
in Nuts.
I, JAMES HOLLINGWORTH, of Dobcross, in the County of York, Power Loom
Maker, do hereby declare the nature of this invention (the said invention being a
communication to me from abroad by George Webb, of Pawtucket, Rhode Island,
one of the United States of America, Engineer), and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement :-
This invention has reference to machinery for accurately and expeditiously
tapping or forming screw threads in nuts.
In order that my invention may be better understood, I will now describe the
same with reference to the annexed sheets of drawings wherein
Fig. 1 is side elevation of a nut tapping apparatus constructed according to my
invention;
Fig. 2 is plan view and Fig. 3 an elevation of the back of the machine.
A represents the framework or standards of the machine and B an inclined table
or dish upon which are mounted three or other number of fixed grooved beds or
rests D for receiving a moveable headstock E from which projects vertically a
suitably shaped boss or head F formed with a recess to receive the untapped nut a
which is inserted therein, such nut resting upon the point of a set screw which
ensures that the hole of the nut is placed exactly opposite the centre of the revolving
tapping spindle G. The set screw together with the nut resting thereon, can be
adjusted in its height when required, which will happen in the course of time by
the point of the screw wearing away; but the nut, however, may rest upon a solid
bottom formed in the recessed boss or head F, or other methods may be employed
for adjusting the position of the nut. The unscrewed end of the tapping spindles G
are made secure within a hole in the horizontal spindles H. caused to revolve by
strap passing over pulleys I or by means of gearing as thought most advisable.
The modus operandi is as follows:-The operative places an untapped nut into
the recess of the boss F so that it cannot revolve, but the headstock E as well as
bors F, is forced in the direction of the arrow (see Fig. 1) by means of the spiral
spring J which causes the headstock to travel towards the tapping spindles, causing
the nut to be fed or forced over the screwed part of the tapping spindle, whereby
the nut is tapped, and when the said nut arrives at the end of the screwed portion
of the revolving tapping spindle G, the moving head E by reason of the spiral or
other form of spring J, pushes the said nut onto the plain or shanked part of the
tapping spindle, after which the operative draws back the sliding head by means
of the lever or handle K and places another untapped nut into the recess of the
boss F, when the spiral spring again forces the nut over the screwed spindle, and
also forces the nut onto the blank part of the tapping spindle; and this goes on one
nut after another until the plain part of the tapping spindle G is filled with tapped
nuts, when the spindle is withdrawn from its position for the purpose of emptying
the nuts or overturning them into a shoot L made in the inclined table B or other
convenient place.
In order to supply oil or other lubricant to the nut and tapping spindle, I employ
a large oil vessel connected to the framework, shewn at M, from which the oil is
drawn by means of a rotary pump N and forced up through conducting pipes O
and received into a suitable form of cup Pescaping therefrom through pipe Q and
falling onto the nut and tapping spindle whereby they are supplied with lubricant,
which overflow lubricant runs down the inclined table B, passing through the
pipe R and entering again into the reservoir M from which it was originally
pumped, whereby the oil is continuously re-used. The pump N is driven by strap
and pulley S from any convenient part of the machine, so that the oil commences to

page_text: run and lubricate the nut and spindle as soon as the machine is set in motion, but
the supply of oil ceases when the machine stops, consequently the oil is not
running or being wasted when the machine is not working, neither is the
turning on or turning off of the oil left to be done at the discretion of the
operative.
By the employment of a machine fitted up with the appliances enumerated
above, nuts can be very rapidly tapped, and the automatic lubrication of the
nuts efficiently performed without the attention of the workman.
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 :-
Firstly. In machinery for tapping or forming screw-threads in nuts, the employ-.
ment of one or more revolving spindles in combination with sliding heads for
carrying untapped nuts in manner substantially as herein shewn and described.
Secondly. In machinery for tapping or forming screw-threads in nuts, the use of
a sliding head provided with a recess for receiving an untapped nut or nuts, made
to advance in the direction of the tapping spindle as described herein and shewn in
the drawings.
Thirdly. In machinery for tapping or forming screw-threads in nuts, the employ-
ment of a set screw or other device for adjusting the position of nut with regard to
tapping spindle as described.
Fourthly. For forming or tapping screw-threads in nats, the general arrangement
and combination of machinery substantially as herein shewn and described, com-
prising revolving tapping spindles, moving heads carrying untapped nuts, all as
described.
Fifthly. For forming or tapping screw-threads in nuts, the general arrangement
and combination of parts substantially as herein described, comprising revolving
tapping spindles, moving heads carrying untapped nuts, in combination with
apparatus for automatically supplying lubricant in the manner herein described.
Dated this 19th day of August 1891.
"
הר CDACASCOUT
TASKER & CROSSLEY,
Halifax and Huddersfield, Agents.