US919712A - Ratchet-drill. - Google Patents

Description

'J. R. GILMAN.

BATGHET DRILL.

APPLICATION FILED SEPT. 28, 1908.

Patented A 7,1909.

amen-Cos T all whom it may concern: r I

- urn I s rs PAZEENT neuron.

JAMES GILMAN, or LOUISVILLE, KENTUCKY.

l .RA'ICHET-DRILL.

Specification of Letters fatent.

Patented April 27', 1909.

Application filed September 28, 1908. Serial No. 454,959.

Be it known that I, JAMns R. GILMAN, a

citizen of the United States, residing at Louisville, in the county of Jefferson, State 7 of Kentuck have in ented certain new and useful Improvements in Ratchet-Drills; and

I do hereby declare the following to he a full,

provision of a ratchet drill. having mechan ism by which a continuous forward rotation 3 of the drill is effected upon the forward stroke and the back stroke of the operating lever or handle of the drill so that the bit will be driven continuously forward into the-work omrated upon. with a more positive andv effective movement.

Another object of the invention is the provision of a ratchet drill which. is simple and durable in construction, very effective in operation and adapted to drive the bit continuously forward on both the forward and backward stroke of the handle thereof.

In the drawings accompanying and forming part of this specification is illustrated one form of embodiment of the invention which to enable those skilled in theart to practice the invention will be set forth at length in the following d6SCIl3t1OI1 while the novelty of the invention wil be included in the claims succeeding said description; However, it is to be understood that changes, variations and modifications may be made such as come properly within the scope of the claims hereunto appended without departing from the spirit of the invention. In the drawings, Figure 1 is a side elevation of the ratchet drill in position for drilling. Fig. 2 is a vertical sectional view thereof. Fig. 3 is a transverse sectional view. Fig. 4 is a sectional viewon the line 44 of Fig. 1. Fig. 5 isa frontviewof the ratchet drill with its front platepartly broken away.

Similar reference characters indicate corresponding arts throughout the several views of the d awings.

In the drawings the ratchet drill comprises a chuck 8 having a central squared. tapering socket 9 to receive the end of abit 1O in oneend thereof and formed with an annular flange 11 and with a gear wheel 12 having a central shank 13 in rear of the annular flange of the chuck. The said chuck is mounted within a casing 14 having an operating handle 15 and which casing is pro- :vided atits front edge with an inwardly directed annular rim or flange 1.6 and in rear thereof are internal gear teeth 17 which mesh with the teeth of a gear wh'cel 18 journaled upon a pin 19 intersecting an opening or space 20 accommodating the gear wheel 18 and contained in an annular shell 21 projecting from one side and integral with a circular plate 22 mounted within the casing. Projecting outwardly centrally from the plate 22 is a threaded feed screw 23 having mounted thereon a threaded sleeve 24 formed with a closed beveled end 25 to engage a fixed part to hold the bit in working position with the material operated upon.

Between the gear wheel 12 and the plate 22 and surrounding the shank 18 of the chuck are opposed cones 26 having annular grooves in adjacent faces to form race-ways 27 in which are disposed ball-bearings 28 to minimize friction during the rotation of the chuck. The said gear wheel 18 meshes with the gear wheel 12 formed on the chuck 8 so as to forwardly rotate the bit 10 upon moving the handle 15 in a forward direction which is termedthe forward stroke thereof. At a diametrically opposite point with respect to the opening or space 20 in the shell 21 is a further opening or space 29 receiving a dog or pawl 30 the latter mounted upon a pin 81 intersecting the said opening or space 29 and having its bearing in the said shell and which dog or pawl 30 is disposed diagonally within the casing and normally engages the teeth of the gear wheel 12 and the internal teeth 17 of the casing so as to lock the said casing 14 with the gear wheel 12 of the chuck upon manipulating the handle 15 to impart a back or return stroke to the drill,

however upon this back or return stroke due to the locked conditionof the casing with the 21 adjacent the opening or space 29 and its opposite free end playing against the said dog or pawl.

Detachably secured by fasteners 34 to the casing 14 are front and rear closing plates 35 and 36 and keyed to the feed screw or threaded screw 23 is a gear wheel 37 abutting against the said rear closing plate 36 and surrounding the gear wheel 37 is a shell head 38 of an auxiliary handle or operating lever 39 and within the shell head 38 is mounted a locking dog 10 to engage the gear wheel 37 so that upon operating the auxiliary handle 39 in one direction will rotate the drill chuck 8 to forwardly advance the bit 10 carried thereby.

To maintain the shell head 38 of the auxiliary lever in a position to surround and inclose the gear wheel 37 there are provided jam lock nuts 11 engaging the threaded screw 23 of the ratchet drill.

In operation the ratchet drill is arranged to cause a continuous forward movement of the drill chuck 8 by intermittent, forward and backward strokes of the operating lever 15. For instance, when the operating lever is moved forward to complete a forward stroke the gear wheel 18 is rotated by being in mesh with the internal gear teeth 17 and by this rotary movement and the said gear wheel 18 enmeshing with the gear wheel 12 of the chuck 8 the latter will be caused to rotate in an opposite direction thereby rotating the bit 10 for cutting action upon the work operated upon. Now upon manipulating the operating lever or handle 15 to complete a back stroke the double acting dog or pawl will automatically be brought into locking engagement with the teeth of the gear wheel 12 and the internal teeth 17 of the casing 14 so as to lock the latter with the drill socket 8 to rotate with. the latter and cause a continuous forward feed of the bit 10 into the work operated upon.

hat is claimed is 1. A drill of the class described comprising a casin havin an o)eratin lever a bit gear and the chuck gear wheel to permit continuous rotation in one direction of the chuck upon forward and backward strokes of the operating lever.

2. A drill of the class described comprising a casing having an operating lever, a bit chuck mounted within the casing, a gear Wheel formed on the chuck, a plate within the casing and having an annular shell, an internal gear formed on the casing, a gear wheel rotatably supported by the shell and in mesh with the internal gear and gear wheel on the chuck, a dog engaging the in ternal gear and the chuck gear wheel to permit continuous rotation in one direction of the chuck upon forward and backward strokes of the operating lever, and feed mechanism projecting outwardly from the said plate.

In testimony whereof, I ailix my signature, in presence of two witnesses.

JAMES R. (HIIMAN.

Witnesses:

HENRY ARTER-BUN, JOHN SAMPLE.

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