Improvements in Screw-threaded Bolts, Rods, and the like, and in Apparatus for Manufacturing the same.
Year: 1890

page_text: Date of Application, 21st Jan., 1890-Accepted. 3rd May, 1890
COMPLEIE DI BUITIVATION.
Improvements in Screw-threaded Bolts, Rods, and the like, and in
Apparatus for Manufacturing the same.
We, JAMES W. WATSON, Superintendent WILLIAM L. GELSTON, Foreman Pattern
Maker and CHARLES A. WEED, President of a Company, all of Chester, Delaware
County, Pennsylvania, United States of America, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be par-
ticularly described and ascertained in and by the following statement:
This invention consists of a machine for cutting right and left screw threads or
bolts, rods, and the like, the same embodying cutting dies, one having a right hand
thread, and the other a left hand thread, the two dies being arranged in the same
plane, so that the bolts, rods, and the like, may be successively subjected to the action
of the two dies.
Each die is connected with a shaft, arbor or mandrel, one being inclosed by the
other, and provided with means for rotating the same, the machine possessing other
features, as will be hereinafter set forth.
It will be seen that the right and left screw threads on bolts, rods, and the like, may
be quickly produced, and they will be found to be of superior order, owing to the
uniformity of the work and admirable qualities of the same in the regularity and
finish of the pitch of the threads.
Figure 1 represents a side elevation of a machine for cutting right and left screw
threads, embodying the invention.
Figure 2 represents a longitudinal section thereof, on an enlarged scale.
Figure 3 represents a side elevation of a bolt or rod having right and left screw
threads, illustrative of the operation of the machine.
Figure 4 represents a horizontal section of a portion on line x, a figure 1, on a
reduced scale.
Similar letters and numerals of reference indicate corresponding parts in the several
figures.
Referring to the drawings: A designates the frame of the machine, on which is
mounted the hollow shaft or mandrel B, one end of which carries a screw cutting
die C, and the other end carries a gear wheel G. Encircling the shaft B, is a hollow
shaft or mandrel E, one end of which carries a screw cutting die F, and the other end
carries a gear wheel D.
The gear wheels D and G mesh with pinions H, whose shaft J is provided with
a clutch K and pulleys. L. Meshing with the wheel G and its pinion H, is an
idler H¹.
The clutch K is operated by a lever M, mounted on the frame A, whereby the
motions of the gear wheels D, G, and of the dies C, F, may be reversed.
The die C is held in position on the shaft B, by means of bolts or screws N, and
the portion of the shaft E, which encircles said die, is enlarged, forming a head E¹,
which carries bolts or screws P, which secure the holder Q of the die F in the end
of the said shaft E, said holder having screws R for retaining said die F in
position.
The periphery of the head E' is recessed, as at S, whereby access may be had to
the bolts N, R, for disconnecting the dies from their holders or carriers, and the
holder Q, may be removed to allow the withdrawal of the dies and subsequent
restoration of the same.
On the frame A is supported the holder T for the bolt, rod, or the like, to be
threaded, said bolt, or the like, being shown at U, figures 1 and 2, it being noticed
that the dies C, F, are in the same plane, or their cutting faces are in a line with
each other, so that the bolt, or the like, introduced into one die, may enter the other,
as will be seen in figure 2.

page_text: The operation is as follows: Power is applied to the pulleys L, by means of a belt
and cross belt, and the clutch K is so set, that proper motion is imparted to the
gearing H, D, G, whereby the shafts B, E, and consequently the dies C, F, are
rotated.
The bolt, or the like, is now advanced to the dies, and it first enters the die F,
whereby a thread is cut thereon, after which it enters the die C, and has a thread cut
thereon over the first named threads, but in reverse direction, both as illustrated in
Figure 3. When the threading is accomplished, the lever M is moved, whereby the
clutch is operated to cause the reversal of the direction of rotation of the gearing, and
consequently of the shafts B, E, and dies C, F, so that the bolt, rod, or the like, may
be withdrawn, after which the lever is returned to its first position so that the dies
may be again rotated in the direction necessary for continuing the screw cutting
operation.
The cuttings may be removed through the recess or opening of the head of the
shaft E, and through the hollow portion of the shaft B.
The reversal of the motion of the dies, after the screw cutting is performed, is
accomplished by means of the mechanism shown in figure 4.
The holder T of the bolt U, or the like, is connected with a carriage V, shown in
figure 1, whose snpporting shaft W has connected with it a pinion X, which meshes
.with a rack-bar Y, on the frame A of the machine. A drum or pulley is also secured
to said shaft W, around the same is wound a cord Z, whose end carries a weight 1,
so that said carriage V may be returned to its normal position after the screw cutting
operation.
To the carriage is secured a bed 2, see figure 4, from which rise the lugs 3,
between which is fitted an arm 4, said lugs being provided with set screws or
bolts 5, whereby the arm may be firmly held and adjusted in the direction of its
length.
The end of the arm towards the dies, carries a wedge-shaped head 6, which enters
the slotted limb 7, of a spring-catch 8, the latter being secured to the frame, as
at 9, it being noticed that the limb 7 is within said frame, and the angle of the catch
has the lever M in engaging contact therewith, in figure 4.
A weight 10 is attached to an arm 11 on the axial end of the lever M, for moving
said lever in the present case to the left, when released of the catch 8.
When the machine is to be started, the lever is moved in the present case, to the
right, and it rides over and presses back the catch, until it reaches the angle or
shoulder thereof, the catch then springing out and holding the lever.
The carriage T is now advanced, and the bolt, or the like, engaged with the dies,
the latter then drawing in the bolt, or the like, as held by the carriage. The wedge
enters the limb 7 and bears against the wall of the slot therein, thus gradually moving
the shoulder or angle of the catch, from the lever M.
When the cutting is accomplished, the catch is fully clear of the lever, and the
latter is no longer controlled by the same, and now becomes controlled by the
weight 10, so that it returns to its first position, thus operating the clutch K and
reversing the gearing, thus reversing the dies.
The bolt, or the like, is now subjected to the action of the weighted cord Z, and
thus withdrawn from the dies, the carriage returning to its first position, and with it,
the connected parts.
It will be seen that right and left screw threads, may be quickly produced
on bolts, rods, and the like, the same being uniform or régular in their finish and
pitch.
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. Screw cutting dies with reversed threads, connected with operating shafts and
occupying the same plane, substantially as described.
2. Screw cutting dies with reversed threads occupying the
same plane and

page_text: connected with operating shafts, one of which is inclosed within the other, substantially
as described.
3. A screw cutting machine having dies, arranged substantially as described, and
provided with reversed threads whereby a bolt, or the like, may have right and left
threads cut successively thereon, substantially as described.
4. Two shafts each carrying a die, and one inclosed within the other, the dies
having threads in reversed directions, in combination with screws or bolts for
connecting the dies with their shafts, one of the shafts having a recessed head which
encircles said bolts, substantially as described.
5. The dies C, F, shafts B, E, and bolts N, R, in combination with the removable
holder Q, of the die F, said holder being removably fitted in the end of the shaft E,
substantially as described.
6. The wedge 6, in combination with the carriage, a catch and the lever M,
substantially as described.
7. The wedge 6, and the carriage, having lugs 3 with set screws 5, as stated.
8. A bolt, rod, or the like, having machine-made right and left intersecting screw
threads thereon, as a new article of manufacture, substantially as described.
Deted this 15th day of January 1890
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicants.