MENTS IN MACHINERY FOR SCREWING OR FORMING SCREW THREADS ON SCREW BLANKS OR BOLTS
Year: 1877

page_text: "
LETTERS PATENT to William Robert Lake, of the Firm of Lake & Co., Patent
Improve-
Agents, Southampton Buildings, London, for the Invention of
MENTS IN MACHINERY FOR SCREWING OR FORMING SCREW THREADS ON SCREW
BLANKS OR BOLTS." A communication from abroad by Edward Nugent, of
Brooklyn, New York, United States of America:
Sealed the 24th July 1877, and dated the 19th May 1877.
COMPLETE SPECIFICATION filed by the said William Robert Lake at the
Office of the Commissioners of Patents on the 19th May 1877.
86
1.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. IMPROVEMENTS IN MACHINERY FOR SCREWING
OR FORMING SCREW THREADS ON SCREW BLANKS OR BOLTS." A communication
from abroad by Edward Nugent, of Brooklyn, New York, United States of
America.
This Invention relates to the construction of a feeding device and its arrange-
ment, in combination with a series of cutters on a single shaft, for cutting the
threads on one or more screw blanks or bolts at the same time, so that each
although taking its motion from the same driving shaft shall be entirely independent
of the other cutters.
The object of the said Invention is to so construct a machine for forming the
thread screw blanks or bolts that any number of blanks may have their threads
formed at the same time without the chips from one cutter clogging the others,
and so that either may be taken out for repairs without stopping the machine or
in any way interfering with the working of the other cutters, and at the same time
so to construct the parts that the movements necessary to form the thread on a
single blank may communicate motion_requisite to operate any number of devices
to cut any number of screws at once. To effect this object I arrange several cutters
in a straight line on a single shaft with a feeding device and other parts necessary
to screw as many blanks, each cutter and set of devices necessary to the cutting
of the thread on a screw blank being entirely independent of the others, the said
driving shaft extending in a line with the cutter shaft and a bar extending the
same distance and parallel with the cutter shaft to give motion to the feeding
device and longitudinal motion to the screwdrivers.

page_text: entirely independent of the other by means of à simple arrangement for throwing
them out of gear.
DESCRIPTION OF THE DRAWING.
Figure 1 is a perspective view of my improved machine for forming threads on
screw blanks; Figure 2 is a top view of a portion of the same; Figure 3 is a
transverse section thereof.
Figure 4 shows on an enlarged scale a clutch device which connects the feeding
arrangement with the bar that gives it motion, as herein-after described.
A is the cutter shaft; B is the feeding device which carries the blank forward
to the cutter; C is the bar which gives motion to the feeding device. This bar
receives a longitudinal motion from a cam D; E is a rest against which the blank
is held while being screwed; F is the die which receives the blank from the feeding
device and forces it against the rest E, holding it there while it is being screwed.
The die F is forced forward at the proper time by means of an incline or cam G on
the side of the bar C, and is forced back to its place again by a spring. A spring H
on the feeding device holds the blank in place against the face of the die until it is
caught between the die and rest. A projection N₁ on the spring H as the feeding
device moves back is brought in contact with an incline O¹, pressing the spring H
back to allow a blank to drop into the socket R'.
I is a screwdriver, which has a longitudinal and a rotary motion. It takes its
longitudinal motion from the bar C by means of an arm J. Its rotary motion is
derived from the main shaft by means of a gear wheel K on the said shaft, meshing.
into a gear wheel L on the screwdriver shaft. A cam M gives motion to a
former N, and through the latter communicates a rocking motion to the cutter
shaft A by means of a connecting arm O. A¹ is the cutter. A spring P holds the
lower end of the arm O in place against the former N.. A cam Q comes in contact
with the end of the cutter shaft A and forces it forward, causing the cutter A¹ to
traverse the blank the distance required to cut the thread, a spring K₁ forcing it
back each time. The cam receives its motion by means of a gear wheel R
attached to it, and meshing into a gear wheel S on the main shaft The cams D
and M receive motion by means of a gear wheel T on their shaft, meshing into a
gear wheel U on the same shaft as the cam Q.
The clutch device V is attached to the bar C, its hinged latch falling into the
forked or slotted arm C¹ on the shaft of the feeding device, so that by means of the
latch D¹ the feeding device may be connected with the bar C to give it motion or
may be disconnected therefrom at will.
The cutter A¹, feeding device B, die F, rest E, and screwdriver I may be increased
to any number without duplicating the other parts, as each separate set of devices
would take their motions from the same machinery necessary to screw a single
blank.
The operation of screwing or forming the thread on a screw blank in this
improved machine is as follows:-The blank is taken from the hopper by the
feeding device B and conveyed forward in front of the die F, its head toward the
screw driver I, and as the feeding device recedes the die F is forced forward against
the blank, grasping it between itself and the rest E. At this point the screwdriver
point enters the slot in the head of the blank and causes it to revolve against the
cutter A¹. The cam M forces the former N forward, thus giving the rocking
motion to the shaft A and forcing the cutter points against the blank. The cam Q
moves against the end of the shaft A, forcing it forward longitudinally, causing the
cutter to transverse the blank, the spring K³ forcing it back. A sufficient number
of movements are thus given to the shaft A to cut the required thread on the blank
when the parts of the device each in its turn release the same and move back to
their places to receive another blank while the finished screw drops into a receptacle
below, and the same operations are repeated on another blank.

page_text: Having thus fully described the said Invention, as communicated to me by my
foreign correspondent, and the manner of performing the same, I wish it understood
that I claim,
First. The shaft carrying two or more cutters in combination with the arm, the
spring, and cams, as above specified and for the purpose set forth.
Second. The feeding device having the spring in combination with the bar, the
cam, and the clutch, as above specified and for the purpose set forth.
Third. The feeding device, the clutch, and the bar in combination with the arm
and screwdriver, as above specified and for the purpose set forth.
Fourth. Two or more cutters arranged in a straight line on a single shaft in
combination with two or more feeding devices and two or more screwdrivers, all
arranged and operating as above specified and for the purpose set forth.
Fifth. A machine for forming screw threads on blanks or bolts and consisting
of the parts constructed and combined as shewn in the accompanying Drawing and
operating as above set forth.
In witness whereof, I, the said William Robert Lake, have hereunto set my
hand and seal, this Nineteenth day of May, in the year of our Lord One
thousand eight hundred and seventy-seven.