Improvements in Drilling Machines.
Year: 1893

page_text: Date of Application, 11th Feb., 1893-Accepted, 6th May, 1893
COMPLETE SPECIFICATION.
Improvements in Drilling Machines.
I, CLARENCE FRANCIS HOTCHKISS of Stow Manufacturing Company, 444 State
Street, Binghamton Broome County, State of New York, United States of America
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 :-
My invention relates to boring machines and particularly to that class employing
a pivotally mounted frame carrying at one end the driven pulley, to which a flexible
shaft is connected and in the free end of which the boring, or other, tool is detach-
ably secured, said frame being counterbalanced, and said pulley being driven by a
belt actuated by two cone friction drive pulleys, held in frictional contact, and such
frictional engagement being increased by a weighted lever, which exerts a downward
force upon the primary drive pulley.
My invention consists in the several novel features of construction and operation
hereinafter described and which are specifically set forth in the claims hereto
annexed.
It is constructed as follows, reference being had to the accompanying drawings,
in which
Fig. 1, is a side elevation of the machine, set up, and showing the swing of the
frame, by the dotted lines.
Fig. 2, is an enlarged front elevation, of the frictional drive pulleys and their
supports, sectional in part.
Fig. 3, is a vertical sectional elevation of the same parts on line xx, in Fig. 2,
showing part of the frame in elevation and a sectional elevation of the lever
carrying the friction weight.
A, is a suitable base, shown in Fig. 1 as secured to the ceiling, in which the
vertical shaft a is secured.
B, is the primary drive pulley mounted loosely upon said shaft, and driven by a
belt b supported thereon vertically by the horizontally projecting flange b'. Around
the hub c of said pulley, I secure leather washers in such manner as to create
thereby a bevelled or cone-face upon the lower part of the pulley.
A loose collar d is mounted upon said hub, and a tight collar d' is also secured
upon the lower end of this hub.
A lever e is pivotally connected to the loose collar and upon one end carries the
friction weight e¹ and at the other end is pivotally connected to the part e" erected
upon the arm el projecting from one side of the sleeve h upon the lower end of the
shaft a.
D, is the secondary drive pulley loose upon the stud m projecting from one side
of said sleeve and integral therewith having a cone-face in engagement with
the cone-face of the primary drive pulley, and grooved peripherally to carry the
belt n.
Upon the outer end of this stud m and upon a pin or arbor m' in alignment
therewith and projecting from the opposite side of said sleeve, I pivotally mount
the side rails p which, converging at the right in Fig. 1, carry the counter
weight p'; and converging at the left, a vertical shaft r is journalled therein upon
which the horizontal and flanged driven pulley is secured, which the belt n drives,
to which shaft the flexible drive shaft w is secured, and to¹ is the tool detachably
mounted in the free end of said shaft w.
It will be seen that the weight e¹ operates to maintain the primary drive pulley
in frictional engagement with the secondary one, and to increase the degree of the
pressure of the former upon the latter, according to the specific gravity of the
weight and the length of the lever carrying it.

page_text: It will be further seen that the shaft a is the pivot of the sleeve / and through
the connections aforesaid, of the frame carrying the flexible shaft, so that the said
frame can be swung laterally to any point; and that the frame through the pivotal
mounting of its side rails, can be swung vertically to depress the flexible belt to its
normal position; and that, in short, said sleeve and its mounting and the pivotal
mounting of the frame thereon, together create an universal joint, as the mounting
of the frame.
The cone-faces of the drive pulleys are normally in frictional engagement, but
can be thrown by raising the weight e¹ and the lever e which will lift the primary
drive pulley.
When the frame p is released from downward strain the weight pl will. raise the
outer end thereof, bringing the cross-bar 2 upon the said frame up into contact with
the bar e beneath the weight e' and raise this latter weight and by the leverage
upon the bar e will raise the cone pulley c¹ out of engagement with the pulley D
and thus stop the machine until the frame p is again lowered so as to permit the
re-engagement of the pulley c' with the pulley D and their frictional contact will
again start the machine.
7.
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 boring machine, a vertical shaft, a cone-faced drive pulley loose thereon,
a sleeve loose upon said shaft below said pulley, a second cone-faced pulley loose
upon a shaft projecting from said sleeve and in engagement with the other pulley, a
counterbalanced frame pivotally connected to said sleeve, a driven pulley mounted
in the free end of said frame, and a flexible tool-carrying shaft connected to said
driven pulley, and means to drive said pulleys, in combination as set forth.
2. In a boring machine, a vertical shaft, a conc-faced drive pulley, loose thereon,
a collar loose upon the hub thereof, a collar secured thereto below the loose collar,
a sleeve loose upon said shaft below said pulley, a second cone-faced pulley loose
upon a shaft projecting from said sleeve and in engagement with the other pulley
a weighted lever pivotally connected to said sleeve, a driven pulley mounted in the
free end of said frame, and a flexible tool-carrying shaft connected to said driven
pulley, and means to drive said pulleys; in combination as set forth.
3. In a boring machine, a vertical shaft, a drive pulley. loose thereon and flanged
to carry the driving belt, and having a cone-face of different material secured to it
below said flange, a sleeve loose upon said shaft, a grooved and conc-faced pulley
loose upon a horizontal shaft secured to said sleeve, a counterbalanced frame
pivotally connected to opposite sides of said sleeve, a driven pulley mounted in the
free end of said frame and having a horizontal flange to carry a belt, a flexible
tool-carrying shaft connected to and driven by the latter pulley, and means to drive
said pulleys, in combination as set forth.
4. In a boring machine, a pivotally mounted and counter-balanced frame, a
flexible tool-carrying shaft connected thereto, and means to drive said shaft, in
combination.
5. In a boring machine, a pivotally and rotatably mounted counterbalanced frame,
a flexible tool-carrying shaft connected thereto, and means to drive said shaft, in
every position assumed by said frame; in combination.
Dated this 10th day of February 1893.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.