US877288A - Ratchet-drill. - Google Patents

Description

PATBNTEDJAILZL 1'90'8. J. B. BLAGKWELL.

RATCHBT DRILL.

oAPPLIOA'I'ION FILED JULY s, 190s.

2 SHEETS-SHEET 2.

JOHN B. BLAOKWELL, OF DARLINGTON, SOUTH CAROLINA.

RA'rcHEi'r-DRILL.

Specification of Letters Patent.

Patented Jan. 21, 1908.

Applicatonliled July 6, 1906. Serial No. 324,929.

To all whom it may concern:

Be it known that I, JOHN B. BLACKWELL, a citizen of the United States, residing at Darlington, in the county of Darlington andv State of South Carolina, have invented a new and useful Ratchet-Drill; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to ratchet drills, and it has for its objects to simplify and irnprove the construction and operation of this class of devices. i

lVith these and other ends in view which will readily appear as the nature of the invention is better understood, the same consists in the improved construction and novel arrangement and combination of partswhich will be hereinafter fully described, and particularly pointed out in the claims.

In the accompanying drawings has been illustrated a simple and preferred form of the invention it being, however, understood that no limitation is necessarily made to the precise structural details therein exhibited, but that changes, alterations and modifications within the scope of the invention may be resorted to, when desired.

In the drawings z-Figure l-is a side elevation, of a ratchet drill constructed in accordance with the principles of the invention. Fig. 2-is a horizontal sectional view, taken on the plane indicated by the line 2-2 in Fig. 1. Fig. 3 is a vertical sectional view; Fig. 4 is a detalil plan view of the operating handle and paw Corresponding parts in the several figures are designated by like characters of reference.

The frame, F, of the improved drill is cruciform, consisting of a vertical portion or stem, 1, having laterally extending arms, 2, 2. The stem is cored and drilled longitudinally to afford a bearing for the bit shaft, 3; the lateral arms 2, 2 have reduced extensions, 4, forming bearings upon which bevel gears, 5, are mounted for rotation; the extremities of the extensions 4 being externally screwthreaded, as shown at 6, for the reception of jam-nuts, 7, 8, and washers, 9, that serve to retain the bevel gears upon the bearings. `The proximate faces of the bevel gears and of the inner jam nuts 7 are formed with ball races,

.for the reception of anti-friction balls, 10.

The bit shaft 3, which extends through the bearing formed for its reception in the vertical portion or stem of the frame, is provided at its lower end with a recess or socket, 11, in which the shank or tang of a bit may be secured by means of a set-screw, 12; or, if preferred, a bit socket, as 13, of ordinary chuck construction may be mounted in the recess 11. The bit shaft carries near its lower end a bevel gear, 14, meshing with the bevel gears 5, 5, and between the hub of the bevel gear 14 and the lower extremity of the stern 1 of the frame there are placed anti friction balls, 15. The bit shaft carries near its upper end a bevel gear, 16, which meshes with the bevel gears 5, 5; the upper extremity of the bit shaft is threaded, as shown at 17, for the reception of the screw case, 18, between the lower extremity of which and the hub of the bevel gear 16 jam nuts, 19, 20, a washer, 21, and anti friction balls, 22, are interposed, the bevel gear 16 being thus supported upon the bit shaft in such a manner as to rotate freely thereupon. The bevel gear 14 is firmly secured upon the bit shaft, as by means of a set screw, 23.

The feed screw, 24, which operates in the screw case 18, is provided with a hand wheel, 25, whereby it may be conveniently operated, and the upper extremity of said feed screw has a conicalbearing point, 26, enabling the device to be operated in connection with a drill support ofordinary construction.

A handle, 27, is provided said handle being provided with terminal divergent straps, 28, 29, having eyes or apertures journaled either direct upon the bit shaft, adjacent to the bevel gears 14 and 16, or upon the hubs of said wheels, as shown in the drawings. The bevel gears are provided with peripheral cogs or teeth, 30, and upon the handle straps 28, 29 there are pivoted reversible, spring actuated pawls, 31, adapted to engage the peripheral teeth of the bevel gears to eect the rotation of the bit shaft in opposite directions; it being readily understood that when the operating handle is reciprocated, said pawls will exercise a pushing action in opposite directions. It will also be seen that by reversing the position of the pawls, the direction of rotation of the bit shaft will be reversed.

For the purpose of assisting in holding the device steady during operation, a handle, 32, is provided, said handle being screwed onto the threaded extremity of the extension 4 of one of the frame arms 2; a cap, 33, is threaded onto the extremity of the opposite frame arm, as shown. Said handle and cap also assist in securely assembling the parts, and impart a neat and finished appearance to the device.

From the foregoing description taken in connection with the drawings hereto annexed, the operation and advantages of this invention Will be readily understood by those skilled in the art to which it pertains. The general construction is simple and `inexpensive; the parts may be readily7 assembled for use, and the arrangement of ball bearings is such that the Working parts Will be largely relieved from friction, and, hence, the device may be used With easeand efficiency.

Having thus described my invention, I claim and desire to securefby Letters Patent of the United States A In a device as speciiied, ythe combination of a cruoiform frame consisting of integral lateral and vertically extending arms and provided With a vertically disposed bore, of a bit shaft journaled therein, a gear having ratchet teeth loosely mounted upon the upper portion ,of said shaft, another gear fixed to the lower portion of sadshaft and also provided .With ratchet teeth disposed opposite to the ratchet teeth of the upper gear, a horizontally operating forked lever provided With oppositely operating s ring actuated paWls to co-act With the rato et teeth, a gear journaled upon one of the lateral arms and a handle extending from the other laterally disposed arm as specified.

In testimony Whereof I have signed my name to this specification in the presence of tWo subscribing Witnesses.

JOHN B. BLACKWELL.

Images