US296924A

US296924A - Eobbet k cheeey

Info

Publication number: US296924A
Authority: US
Publication date: 1884-04-15
Anticipated expiration: 1901-04-15

Description

(No Model.)

' R. N. CHERRY.

SELF FBEDING. RATGHET DML?. No. 296.924. Patented Apr. 15, 1884.

l i Wroesses: a www j, Jazz/6712507* l x. y

N. PETERS. mnnrulhngnpmr, wam: nnnnn c.

UNTTED STATES PATENT "Charna ROBERT N. CHERRY, OF` JERSEY CITY, NEV UERSEY.

SELF-FEIEDING FlATCHET-DRILL.`

SPECIFICATION forming part 0f Letters Patent NO. 296,924, dated Arpril 15, 1884.

Application filed November 15, i883. (No model.)

To @ZZ whom it may concer/L f Be it known that I, ROBERT N. CHERRY, a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jersey, have invented a new and useful SelfFeeding Ratchet-Drill, of which the following is a specification.

My invention consists in a device for automatically operating the feed-screw of an ordinary ratchet-drill. I obtain this result by the mechanism illustrated in the accompanying drawings, in which- Figure` l is a longitudinal section of that part of the tool to which my invention relates. Fig. 2 is a sectional plan on line :c a: of Fig. l. Fig. 8 is a sect-ion on line YY of Fig. l, showing the contour of the casing D. Fig. 4 is a vertical central section of a drill containing my improvement.

Similarlettersrefer to similar parts throughout the several views.

Referring to the drawings, A is the wrench, B the stock, and C the feed-screw, of an ordinary ratchet-drill.

e is a groove out in the inner face of the wrench A.

L is a crown ratchet-wheel formed on th stock B.

L is a crown ratchet-wheel having a circular opening about its axis, by which it is slipped upon the stock B.

f is a rib formed on the ratchet L. The rib f slides freely in the groove c. It will be seen that the-wheel L, through the rib f sliding in the groove e, will partake of motion from the wrench A.

d are teeth formed on the wheel L', adapted to engage with the teeth b, formed on the wheel L.

a. is a spring resting upon the nut I, and bearing on the under face of the wheel L. The spring a operates to keep the teeth d in engagement with the teeth Z, and at the saine time to permit the teeth to play past each other during the operation of the wrench.

D is a casing fitted loosely on the stock B, the stock being free to revolve in the same.

E is a spur-gear screwed rigidly on the end of stock B. E is a spur-gear meshing with E and carried on the stud G.y The wheels E and E are bored eccentri'cally, for a purpose to be hereinafter shown.

H is a ratchet-wheel having a feather, o, sliding in the spline p, cut in the feed-screw C.

h is a pawl carried by a pin, t', the pin being stepped in either of the holes n in wheel E.

J is a plate held by the screw K for the purpose of inclosing the works.

m is a glass plate or disk, to be hereinafter explained.

s s s are holes in the feedscrew, to be used for inserting a small rod for,the purpose of slacking down the screw when a hole is tobe drilled part way through a piece of metal.

l r is a hole in the casing D, for a purpose to be hereinafter explained. The holes t in the screw K are to enable it to be crowded snugly to the plate J by passing a rod through the holes. The feed-screw C is threaded into the upper end of the stock B, so as to be rotated by the stock; but the pawl hacts against the ratchet `H to give the screw C a slower movenient than the stock B. i

' Operation: By vibrating the wrench A the stock B is caused to revolve, carrying with it the eccentric-gear E, feed-screw C, and ratchet-wheel H, all at a uniform speed. The ec centric wheel E engages with and drives the eccentric wheel E', which in turn carries the pawl h through a complete circle. At each revolution the pawl It engages with the ratchet H and retards its speed. The toe q of the pawl h leaves the ratchet-wheel H in the proper position to engage with the ratchet at its next revolution; but should the pawl lose its proper position by turning on its axis `while the wheel F/ is making a revolution, then the heel z of the pawl 7L will tread on the face of the ratchet H, thereby placing the toe of the pawl in position to again engage with the wheel H. The radius of the ratchet Hbeing greater than theradius from the holes a to the center of the wheel E', it is obvious that the teeth of the ratchet H travel faster than the toe q of the pawl h; hence when the toe q of the pawl h. is in engagement with the teeth of the ratchet H it follows that the ratchet-wheel, with the feed-screw C, will revolve slower than the stock B, thus feeding the drill to its work; and, further, the wheels E and E' being eccen- IOO tric, the wheel E being` carried at a uniform speed with the stock B, it follows that the speed of E will vary at every point between its least and-greatest radii; hence by shifting the pawl hin the holes n a slow, Inedinin, or fast feed is obtained. The glass plate m is to enable the operator to see Without removing the plate J in which of the holes n the pawl is placed.

To operate the tool, place it in an ordinary brace or clamp; then pass any small rod through the hole r and allow the rod to bear against the brace or clamp, thus preventing the easing I) from revolving with the Stock B, and thereby producing the feed.

Having thus described my invention, I claim asnew and desire to secure by Letters Patent- The combination of the eccentric Wheels E and E, the ratchet H, 'pawl h, feed-screw C, and stock B, substantially as herein shown 2o and described.

RCBT. N. CHERRY.

vifitnesses:

JOHN M. CHERRY, REUBEN B. CHERRY.