Year: 1893

page_text: Date of Application, 10th Oct., 1893-Accepted, 10th Oct., 1894
щастие.
Fig. 4 is a detail view showing the gear for driving the tool-carrying spindles.
Fig. 5 is a side elevation of one of the screw-forming tools.
Fig. 6 is a front elevation and Fig. 7 a side elevation of one of the devices for
adjusting the tools.
The main parts of the improved machine are the three tool-carrying shafts or
spindles.
In ordinary machines of this class, the tool-carrying shafts or spindles are
always inclined and converge towards the point of operation. In the present
machine, the tool-carrying shafts or spindles may be parallel with or at an inclination
to one another.
Each tool-carrying spindle A has at its operating point a screw-forming
tool B B', shown separately in Fig. 5, consisting of the screw-former proper B and
a tail or shank B. The tool is made in one piece, and the thread-forming part B
may be allowed to wear away until its diameter becomes no greater than the
diameter of the shank. These screw-forming tools replace the rollers ordinarily
employed, and are adapted to form screws of very small diameter, if required.
They are closed or thrown into engagement by means of a cam C mounted to
rotate independently on a shaft E. The boss of the cam C is furnished with teeth.
A sleeve or clutch D, arranged to slide on the projecting end of the shaft E, and
connected thereto by a feather and feather-way, has teeth corresponding with the
teeth on the cani C. The teeth on the sleeve or clutch D are caused to engage
with the teeth on the cam C by depressing the pedal F. When this pedal is
released, the weight G, which is connected to the cam C, turns the latter back
into its normal position, thus permitting the tools to open and move out of
engagement. In the periphery of the cam C there is a notch adapted to engage
with a roller on an adjustable fork mounted on the arm V' of the locking
device V. The outer bearing of the tool-carrying spindles A are provided with
wings or lugs (Fig. 3), each terminating in an incline corresponding with one of
the inner inclined notches of the locking device V. When the roller r carried
by the arm V' of the locking device V engages with the notch in the periphery of
the cams C, the screw-forming tools are free to move away from one another. In
order to cause them to close on the blank, is necessary to depress the pedal F,
which is connected by a link and arm with a shaft carrying a fork engaging with
the sleeve, or clutch D on the longitudinal shaft E. This brings the teeth of the
cam C and clutch I into gear, the cam is set in motion, the locking arm V' is
raised, and the tools are moved close together for operation. By means of au
adjusting screw H, the extent of the engagement can be regulated in order that
the tool may be compressed more or less tightly as may be required.

page_text: A device, such as shown in Figs. 6 and 7, is provided on each of the shafts A for
enabling the tools to be adjusted until the pitch of the screw-thread formed on the
heated blank is sufficiently accurate. By turning the toothed piece J embedded in
a recess formed in a collar K, that collar and the collar L are caused to rotate in
opposite directions, thus turning to the desired extent the shaft A on which the
particular device is mounted. The bolt M serves to prevent the parts K and L
from becoming separated.
The inner end of each of the three shafts carries a pinion N (Fig. 4). The
three pinions N engage with the teeth of an internally toothed wheel O, which is
rigidly connected to a toothed wheel P on the shaft P. This wheel is actuated by
a pinion R keyed on the end of the main driving shaft Q. The shaft Q carries a
fast pulley S and a loose pulley S'. By means of the gearing R, P and U, motion
is conveyed from the shaft to the wheel W, which is keyed to the shaft E
extending along the machine. The shaft E rotates continuously. The cam C is
intermittingly operated by means of the clutch D so as to open or close the
tools B B'; that is, so as to move them into, or out of, the operative position, as
may be required.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I claim :-
1. In a machine for making screws, screw-bolts or screw-taps from heated blanks,
the employment, in lieu of inclined converging spindles, as hitherto used, of parallel
spindles, such as A, substantially as herein described.
2. In a machine for making screws, screw-bolts or screw-taps from heated blanks,
the employment of screw-forming tools, such as B B', each consisting of two parts,
namely, the screw-former proper (B) and the shank (B¹), substantially as herein
described.
3. In a machine for making screws, screw-bolts or screw-taps from heated blanks,
the employment of a toothed cam, such as C, actuated by means of a correspondingly
toothed clutch, such as D, for the purpose of moving the tools B B' into the operative
position, substantially as herein described.
4. In a machine for making screws, screw-bolts or screw-taps from heated blanks,
the employment of a pedal, such as F, and counterweight, such as G, for acting on
the clutch D and the cam C, thereby serving to move the tools B B¹ into and out
of the operative position, substantially as herein described.
5. In a machine for making screws, screw-bolts or screw-taps from heated blanks,
the employment, for adjusting a screw-forming tool, of a device consisting of a
toothed piece, such as J, which, on being turned, actuates collars, such as K and L,
rotating them in opposite directions, substantially as herein described.
6. The improved machine for making screws, screw-bolts or screw-taps from
heated blanks, substantially as described with reference to the accompanying
drawings.
Dated the 10th day of October 1893.