IMPROVE- MENTS IN FEED MOTION FOR RATCHET BRACES AND DRILLS
Year: 1885

page_text: COMPLETE SPECIFICATION.
I, JOHN FRANKLIN ALLEN, of the City and State of New York, United States
of America, Engineer, do hereby declare the nature of my invention for IMPROVE-
MENTS IN FEED MOTION FOR RATCHET BRACES AND DRILLS and in what manner
the same is to be performed to be particularly described and ascertained. in. and
by the following statement:-
The nature of my invention consists in the arrangement of gearing connecting
the spindle or stock with the adjusting screw of the drill, for the purpose of
producing an automatic and regular feeding device during the operation of the
drill.
In the accompanying drawing Fig I represents a section of a Ratchet Brace
embodying my invention. Fig II is a cross section at line 2, 2, fig L. Fig III is a
cross section at line 3, 3, fig L. Fig IV is a section and internal view of the gear
wheel.
Similar letters represent similar parts in all the figures.
A represents the spindle. or stock, into the lower part of which the tool B is
inserted, and in the upper part, the adjusting screw C. This spindle is provided
with a ratchet D, around which the handle E is fitted, arranged with a suitable
spring pawl operating the ratchet in the usual manner.
Around the upper part of this spindle A, a sleeve F is placed connected with the
handle E and turning freely with said handle. The upper part of this sleeve
forms a hollow chamber F1, the internal diameter of which is eccentric with the
end of the spindle.
The upper end of the spindle A has teeth n cut in its body forming a pinion as
shown in figs I and III. Instead of cutting the teeth into the spindle a suitable
pinion may be attached, but I prefer cutting the teeth into the spindle so as to
allow the sleeve to pass freely over the same without the necessity of disconnecting
any part as would be required if a pinion is attached.
G is a ring fitted loosely into the chamber F1 capable of turning freely. The
lower internal part of this ring is provided with teeth m corresponding with the
teeth n at the end of the spindle and meshing into the same. The number of teeth
in this ring G must be greater than the number of teeth on the end of the spindle.
For braces to be used on cast iron, one tooth more in the ring G will be about the
right proportion, while for braces to be used for wrought iron two teeth more in

page_text: the ring G than at the end of the spindle will be required. The upper part of the
ring G is made with a recess w, see fig IV for the purpose hereafter mentioned.
Upon the top of the spindle A a ring H is placed, passing freely around the
adjusting screw C. This ring H has at its lower part a tongue or projection v
fitting into the recess w in the ring G. This ring H is provided with a key K
fitting into a suitable groove in said ring and working in a groove L, extending
the whole length of the adjusting screw C.
By this arrangement the motion given to the ring G is communicated to the
ring H, and through the key K to the adjusting screw C. The key K is fastened
in its position by a small pin J.
The operation is as follows: By detaching the key K and withdrawing the same
out of the ring H and from the groove L in the adjusting screw C, this screw C
can be turned in the usual manner to regulate the length of the ratchet brace, and
fit the same to the work. The key K is then replaced and secured by the pin J,
when the brace will be ready for operation.
By the forward turning of the spindle A and tool, the teeth n in the top of the
spindle will turn the ring G, the difference of speed between the spindle A and
this ring G depends upon the relative proportion of the teeth in the spindle A and
said ring G. This motion of the ring G is communicated to the ring H through
the connection of the two by means of the tongue v on the ring H, with recess w
in the ring G and through the key K connecting this said ring H with the
adjusting screw C, said screw is turned in the spindle A producing thereby the
desired regular feeding of the tool automatically during its operation. The amount
of this feed depends upon the pitch of the screw thread on the adjusting screw C
and upon the relative number of teeth in the ring G and on the end of the
spindle A.
The ring G and ring H are retained in their proper position by the cap plate N
fastened to the top of the chamber F¹.
Instead of connecting the ring or sleeve H with the ring & by means of a tongue
or projection v fitting into a recess w in said ring G as above described, the sleeve
or ring H may be provided at its lower part with teeth, meshing into the teeth m
in the inside of the ring G which said teeth in that case are extended the whole
depth of the ring G.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
First. The combination of toothed spindle A, with ring G, adapted to operate
the adjusting screw C, by intermediate ring H, and key K, said ring G having
internal teeth of a greater number than on the spindle, substantially as specified.
Second. The combination of toothed spindle A, with internally toothed ring G,
and with ring H, keyed to the adjusting screw C, substantially as and for the
purpose set forth.
Third. In a ratchet brace the combination of toothed spindle A, the rings G
and H, connected by tongue or its equivalent, the key K, and having the adjusting
screw C, having groove L, arranged to operate in the manner and for the purpose
substantially as specified.