US412509A - Ratchet-drill - Google Patents

Description

(No Model.) 2 sheets-sheen 1.`

G. 8v J. L. JONES.

RATGHET DRILL.

No. 412,509. Patented Oct. 8I 1889.

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(No Model.)

G. LJ. L. JONES.

RA'TGHLT DRILL.

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GEORGE JONES AND JOHN L. JONES, O F CHATTANOOGA, TENNESSEE.

RATCH ET-DRI LL.

SPECIFICATION forming part of Ltters Patent No. 412,509, dated October 8, 1889. Application filed August 23, 1889. Serial No. 321,782. (No model.)

To all whom it may concern:

Be it known that we, GEORGE JONES and JOHN L. JONES, citizens of the United States, residing at Chattanooga, in the county of Hamilton and State of Tennessee, have jointly invented a new and useful Improvement in Ratchet-Drills, of which ythe Afollowing is a specification.

Our invention relates to improvements -in ratchet-drills, andhas for its objects to provide means which will enable the drill to be reversed or advanced at the will of the operator; to provide a feed-screw having a squared portion equipped with a cone point or center at each end and carrying a solid nut having ratchet-wheels with reversely-arranged teeth, and to provide pawls upon the handle of the drill, one of which has an extended lip normally held in contact With the fixed ratchet on the drill-stock and with the lower of the two ratchets upon the feed-nut.

A further object of the invention is to provide a dog which is adapted to be detachably secured by a key or otherwise to either of the squared ends of the feed-screw, and which serves to hold the said screw from turning, as

will be hereinafter described.

We attain these objects by the mechanism illustrated in the accompanying. drawings, in which- Figure lis a vertical sectional view of a ratchet-drill constructed in accordance with our invention; Fig. 2, a side elevation; Fig. 3, a plan view; and Figs. 4, 5, and 6, detail views, to be hereinafter referred to. Figs. 5 and 6 are drawn to an enlarged scale.

Similar letters refer to similar parts throughout the several views.

The stock or barrel A, with its chuck B vfor holding the drill, the ratchet-wheel C, keyed to the stock, and the handle D, are well known and constitute no partl of our invention.

y Mounted on a pivot-bolt d in a slot of the handle is a pawl E, having an extended lip e,

Y said pawl being held to its work by a spring in the usual manner. The lower part of the face of this pawl engages with a ratchet C, fixed on the stock o f the drill to turn said stock when the handle is worked in the manner common to this class of devices; but the upward extension of the lip serves an entirely different purpose, as will be hereinafter explained. Mounted on the same vertical pivot d on the top surface of the handle is a twoarmed lever F, having integral wit-h its shorter arm a pawl f. The long arm of this lever is flattened, and has a vertical perforated depending portion f', which ts over a bolt G, working in a transverse perforation g of the handle. As the lever swings in the are of a circle, the transverse perforation is of sufficient size to allow the bolt to accommodate itself to this movement. Surrounding this bolt is a spiral spring g,which bears against a sleeve or washer resting against the rear end of the lever, and tending continually to force the pawl of such lever out of contact with the reverse ratchet on the feed-screw, as shown in Fig. 3.

I-I is a feed-nut having cast integrally with its hub the two ratchets h h. The teeth of the ratchets h h have reverse inclinations. The internally-threaded hub of the feed-nut extends for a short distance from each side of the ratchets. Fitted within the nut is a reversible feed-screw l, the thread of which has the usual pitch, and at each end this screw is squared or iattened, as at i', and is provided with a conical point or center 2, made of the best refined steel, and with a transverse groove i3.

J is a dog having two bifurcated portions j j at right angles to each other. The arms of the bifurcated portion j of this dog are spaced apart sufficiently to lit upon either squared end of the feed-screw, and are perforated at js to receive a pin or key j4, which, fitting in the groove 3, locks the dog in position upon said screw. The purpose of this dog is to keep the feed-screw from turning and also to hold it central with the post, thereby preventing the drill fromv grinding the sides of the hole. A chamber K, adapted to receive either extension of the feed-nut, is formed in the upper end of the drillstock.

Having thus described our invention, the operation thereof is as follows, viz: The drill being placed in position, the handle is worked back and forth in the usual manner, causing the pawl E to operate the ratchet C, and the extended lip e thereof to engage with the teeth ICO manner: Should a bind of the parts ensue from this or any other canse, by simply pressing on the handles of the patri-levers E F the paWl E is thrown out of contact with the ratchets C 7i and the pawl F into contact with the reverse ratchet h', thereby slightly reversing the feed-screw and thus relieving the drill, enabling the operator to start again with less pressure on the drill, this operation being repeated until the hard place is passed.

IVhen it is necessary to change the drill, the operator grasps the handles of the two paWllevers, throwing one pawl out of and the other into action, as above set forth, and reverses the screw a couple of turns. The key j* is then knocked out and the dog J released,

instantly' relieving the ratchet.

The reversible double ratchet-Wheel and feed-screw constitute an important feature of our invention, as by reversingr this device end for end the machine is ready for operation without the labor of screwing the feed-screw to position lWithin a screw-chamber in the drill-stock.

We do not limit ourselves to the exact devices shoWn and described, as it is obvious many changes could be made therein which would come Within the province of our invention.

Having thus fully described our invention, what We claim, and desire to secure by Letters Patent, is-

l. A drill-stock provided with a chamber in its upper end, the Walls of which are plain, in combination with a removable feed-screw carrying a nut, the hub of which is adapted to t Within said chamber, substantially as set forth.

2. A ratchet-drill stock enlarged at its upper end to form a chamber, in combination With a removable feed-screw having a nut provided With ratchet-teeth, said nut having an extended hub adapted to fit Within the chamber, substantially as set forth.

3. A ratchet-drill stock provided with a chamber at its upper end, in combination with a vremovable feed-screw and a nut carrying reversely-arranged ratchet-teeth, and provided With an extended hub on each side gf said ratchet-teeth, substantially as set Orth.

4. A feed-screw for ratchet-drills, provided with a squared portion at each end, in combination with 'a dog having a bifurcated portion adapted to be secured on either end of said screw, substantially as set forth.

5. A ratchet-drill stock enlarged at the upper end to form achamberand provided with the usual fixed ratchet-wheel, in combination With a feed-screw, a nut on said screw provided'with ratchet-teeth and with an extended hub, a handle sleeved on the drill-stock, and a pawl having an extended face adapted to engage the ratchets on the stock and feedscrew, substantially as set forth.

6. In combination with a ratchet-drill stock, a reversible feed-screw having'acone point or center at each end, a nut provided with reversely-arranged ratchets, a handle sleeved on the drill-stock,a pawl having an extended face carried by the handle, and a second pawl, also mounted on the handle and normally held out of contact with the upper of the reverse ratchets on the feed-nut, substantially as set forth. i

7. The combination, with a ratchet-drill stock and a handle sleeved thereon, of a pawl pivoted within the handle and having an extended face, a feed-screw, a nut provided with reversely arranged ratchet teeth, a paWl mounted on a vertical pivot in the handle, and a spring for holding said pawl normally ont of contact with the ratchet on the feednnt, substantially as set forth.

8. In combination with a ratchet-drill stock having a chamber at its upper end, a handle sleeved to said steck, a spring-actuated pawl with an extended face carried by the handle, a feed-screw, a nut provided with reverse ratchets and with an extended hub, a pawllever pivoted to the top of the handle and having an extended perforated arm, and a spring-actuated bolt passing through a perforation in the handle, substantially as described.

9. In combination with the stock A, having ratchet O, and provided with the chamber K, the handle D, sleeved to said stock, the springactuated pawls E F, pivoted on said handle, the nut I-I, having extended hubs and carrying the reversely-arranged ratchets h h', and the reversible feed-screw I, having a cone point or center at each end, substantially as described.

GEORGE JONES. JOHN L. JONES.

Witnesses:

D. P. MoNTAGUE, GEO. L. GILLSPIR.

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