Improvements in Drilling Apparatus.
Year: 1897

page_text: Date of Application, 21st Oct., 1897--Accepted, 15th Jan., 1898
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COMPLETE SPECIFICATION.
Improvements in Drilling Apparatus.
I, CHARLES DAVIS CUTTS, of Fort Fairfield, in the County of Aroostook, and
State of Maine, one of the United States of America, Merchant, 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 improvements in drilling apparatus and has for its.
object to provide an ordinary hand drill with a steadying device when it is applied
to a pipe or similar article.
To the accomplishment of this object my invention consists in providing an
externally screw-threaded sleeve with means for securing it to a bit-stock and
with a chain nut designed to travel thereon and to carry a chain encircling the
object upon which it is desired to operate, for the purpose of properly centering
the drill and for insuring the accuracy of its operation.
Referring to the drawings,
Figure 1 is a side elevation of an ordinary brace provided with a bit and with
my improved apparatus as applied to a pipe.
Figure 2 is a plan view of a screwed sleeve and its connected mechanism.
Figure 3 is a plan view of the chain nut.
Referring to the drawings, 1 indicates the brace, 2 the brace-cap, 3 the handle,.
4 the head, 5 the bit-stock, and 6 the bit of an ordinary, hand drill. In the form
of drill illustrated the brace is designed to be swiveled upon the bit-stock and
designed to be intermittently connected thereto by pawl and ratchet mechanism .7
of well known construction. .8 indicates what I will term the cylindrical sleeve of
my device which is externally screw-threaded and is provided near its upper end
with a number of preferably diametrically opposite threaded holes 9 designed for
the reception of the threaded portions 10 of the sleeve-securing thumb screws 11.
The screws 11 are preferably provided with heads 12 and have their, extremities
rounded as at 121, and preferably polished, to prevent their cutting the neck of a
bit-stock against which they are designed to be screwed for the purpose of securing
the sleeve to an ordinary stock. Suitable locking nuts 13 may be provided to
ensure the fixed adjustment of the screws. 14 indicates the travelling chain nut.
consisting preferably of a substantially circular body part 15 having a screw-
threaded bore 16 and provided with diametrically opposite chain grips 17 of any
suitable character. The chain grip illustrated is, however, a preferable embodiment
of that element of my invention consisting simply of a swivel 18 to which a chain
is designed to be attached at one end and a T-shaped slot 20 upon the opposite
side of the nut designed to receive the free end of the chain and in which the chain
may be locked at any desired length by turning it at right angles to its normal
direction. For the purpose of reducing the friction between the travelling nut
and the sleeve 8, I prefer to notch the threaded bore 16 by a series of notches 21.
It will be seen that when the drill is desired to be employed for the purpose of
tapping a metallic pipe or similar article, it is simply necessary to slide the sleeve 8
over the bit-stock and secure it thereon by adjusting the thumb screws 11 to bring
their rounded ends 12¹ firmly against the neck of the stock, the adjustment of

page_text: the screws being fixed by turning the locking nuts 13 against the sleeve. The
chain nut is now rotated upon the sleeve until it assumes the proper relative position
and the bit having been directed against the pipe the chain is carried under said
pipe and after being drawn taut is secured in the chain grip 20. All strain upon
the sleeve will be opposed by the frictional contact between the thumb screws 11
and the neck of the stock as well as by, a positive limiting stop formed by the
ledge 22 of the bit-stock against which the abutment screws 11 are designed to
impinge. When practical, sockets may be formed in the stock for the reception of
the screws, but ordinarily this is not necessary. As the bit progresses in the course
of the process of drilling the slack caused thereby in the chain may be taken up
by rotating the travelling nut 14, a very slight rotation being necessary under
ordinary circumstances to take up the slack produced during the drilling of a
hole of reasonable depth.
I do not desire to limit myself to the details of construction herein shown and
described but reserve the right to change, modify or vary them at will within the
scope of my invention.
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 drilling apparatus of the character described the combination with a
sleeve and sleeve securing mechanism, adjustably carried by the nut, substantially!
as specified.
2. In a drilling apparatus of the character described, the combination with an
externally screw-threaded sleeve, of adjustable sleeve retaining mechanism, a
travelling nut carried by the sleeve, and a chain adjustably carried by the travelling
nut, substantially as specified.
3. In a drilling apparatus of the character described, the combination with an
externally screw-threaded sleeve, of abutment screws carried thereby, locking nuts
upon said screws, a travelling chain nut carried by the sleeve, a chain secured to
one side of the travelling nut, and a chain clamp upon the opposite side of said
nut designed to adjustably secure the chain, substantially as specified.
4. In a drilling apparatus of the character described, the combination with a
cylindrical sleeve externally screw-threaded and provided with a plurality of
threaded holes near one extremity, of threaded abutment screws piercing said
holes and provided with rounded ends, lock nuts upon said abutment screws, a
travelling chain nut provided with an internal threaded bore designed to receive
the chuck sleeve, and with oppositely extending chain clamps, a chain secured
to one of said clamps, and a T-shaped slot to adjustably retain the free end of the
chain, substantially as specified.
Dated this 20th
Ontahan 100%