Improvements in Miners' and other Ratchet Drills.
Year: 1897

page_text: Date of Application, 10th Dec., 1897
Complete Specification Left, 10th Sept., 1898-Accepted, 12th Nov.,
1898
Improvements in Miners' and other Ratchet Drills.
We, DANIEL SMITH and JAMES SMITH, both of 16, Foundry Open, Gallowgate,
Camlachie, Glasgow, Engineers, do hereby declare the nature of this invention
to be as follows:-
This invention relates to ratchet drills used by miners' and others and it has
for its object to improve their construction.
In carrying out our invention instead of the usual ratchet hand-lever and pawl
we use a hand-lever fulcrumed near its lower end and provided with a curved or
bent toe which is capable of entering the teeth of a loose toothed wheel. This
loose toothed wheel which is mounted on the drill spindle drives an intermediate
pinion and gear wheel which latter in its turn drives a fast gear wheel on the drill
spindle.
The whole arrangement is such that at each movement of the lever the gearing
is set in motion and revolves the drill and at the same time automatically feeds
it forward.
The intermediate gear wheels may be made interchangeable so that any desired
speed can, by changing the gear wheels, be given to the drill spindle.
An indicating pin can be litted on the usual slide of a miners' drill for the pur-
pose of indicating the amount of the feed.
The screw feed may be the same as usual with the exception that the screw
spindle may be made with a coarse and strong thread.
The gear wheels of the intermediate gear may be carried in a movable frame.
1008
We, DANIEL SMITH and JAMES SMITH, both of 16, Foundry Open, Gallowgate,
Camlachie, Glasgow, Engineers, do hereby declure the nature of this invention
und in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:
-
This invention relates to hand-lever ratchet drills or ratchets as generally used by
minera, mechanics, and other workmen for drilling and boring purposes and it has
for its object to improve their construction.
Under this invention there is combined with the ratchet drill or ratchet suitable
gearing whereby the bits or drills can be rotated, when necessary, with much

page_text: greater speed than heretofore. Owing to the fact that the boring bit or drill can
be much more quickly rotated in the now ratchet than in the common ungeared
ratchet much time and labour in boring and drilling operations can be saved.
And in order that our said invention may be properly understood we have here-
unto appended an explanatory sheet of drawings, whereon:-
Fig.
is a side view of our new geared hand drilling machine.
Fig. 2 is an end view of the same.
Fig. 3 is a vertical longitudinal section of the drill Fig. 1.
Fig. 4 shows a slight modification.
In carrying out our invention we provide the hand lever a with a pawl b borne
upon by a spring c. The pawl is capable of entering the teeth of a toothed wheel d
mounted loosely upon the drill spindle e and which drives a pinion f made in one
with a sleeve and a toothed wheel which latter, in its turn, drives a small
toothed wheel fitted fast to the drill spindle.
The wheels h, f, and sleeve g revolve upon the pin ji passed through the forked
frame fitted upon the spindle.
is the chuck and m the drill broken off.
The ratchet drill shown on the drawings is for use by coal miners, and, as a
consequence, it has a long screw feed. As will be seen the spindle e extends
backwards some distance and is screw threaded and it carries a long screw nut n.
This nut is enclosed by a casing o secured to the forked frame by screws p and
slotted nearly its whole length at q. Passed through the slot into the nut is a pin r.
The drill is self feeding.
The whole arrangement is such that at each movement of the hand-lever a the
gearing is set in motion and revolves the drill and at the same time automatically
feeds it forward.
As the spindle e revolves it works as usual in the nut n and feeds the augur
bit m forward. For the purpose of preventing the spindle being screwed right
out of the nut the pin is provided. When the pin reaches the end of the slot g
it prevents the drill being fed further forward.
In some cases, especially where small and finely toothed gear wheels are used
it is advisable to cast in oune with or secure to the wheel d a ratchet wheel s, as
shown at Fig. 4, into the teeth of which the pawl 6 may work. In this case the
b
lever jaw would be made as shown in the figure, that is to say, wide enough to
pass outside of both wheels d, s.
The intermediate gear wheels may be made interchangeable so that any desired
speed can, by changing the gear wheels, be given to the drill spindle.
The screw feed may be the same as usual with the exception that tho screw
spindle may be made with a coarse and strong thread.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we consider novel and desire to claim is;-
:-
1. Haud lever ratchet drills or ratchets having combined with them suitable
gearing for the purpose of increasing the speed of rotation of the boring drill or
bit, substantially as set forth.
2. The construction or general arrangement and combination of parts of the
geared hand ratchet drill or ratchet, substantially as hereinbefore described and
shown on the drawings annexed.
Datel this 8th day of Santamber 1908
H. D. FITZPATRICK,
100, Wellington Street, Glasgow, Agent.