US1212480A - Bit-brace. - Google Patents

Description

S. N. HALL 6: C. M. PETERSEN.

Patented Jan. 16, 1917.

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I T STATS ATET FFTCE.

SAMUEL N. HALL, OF MEMPHIS, TENNESSEE, AND CARL M. PETERSEN, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNORS T0 SAID SAMUEL HALL.

BIT-IBRACE.

Specification of Letters Patent.

Patented Jan. 16, 1917.

T 0 all whom it may concern:

Be it known that we, SAMUEL N. HALL and CARL M. Pn'rnnsnn, citizens of the United States, residing at Memphis, in the county of Shelby and State of Tennessee, and Washington, District of Columbia, respectively, have invented a new and useful Bit-Brace, of which the following is a specification.

This invention relates to bit braces and is more especially designed as an improvement upon the structure disclosed in anapplication filed by Samuel N. Hall on February 9, 1914, Serial No. 817,618.

One of the objects, of the invention is to provide a bit brace having improved means whereby the chuck can be rotated at either of two speeds during the operation of the crank arm, the parts of the mechanism being so assembled that they will not become displaced accidentally and will distribute strains in such a manner as to materially strengthen the structure and prevent the parts from breaking under ordinary usage.

A further object is to provide a bit brace having improved means for coupling the parts thereof whereby the same can be operated at either of the two speeds.

Another object is to provide a supplemental grip or handle by means of which the brace can be properly held during the actuation of the speed multiplying mechanism combined with the brace.

YVith the foregoing and other objects in riew which will appear as the description proceeds, the invention resides in the com-' bination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed, with-v out departing from the spirit of the invention. I

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings :,Figure is a view partly in'ele'vation and partly in section of a brace embodying the present improvements. Fig. 2 is an enlarged section on line AB Fig. 1. Fig. 3 is a section on line CD Fig. 1, said section being on an enlarged scale. Fig. 4.- is an enlarged section on line EF Fig. 1. Fig. 5 is a sectlon on line G-H Fig. 1, parts being broken away.

Fig. 6 is an enlarged section on line TJ Flg. 1. Fig. 7 is a perspective view of the lower end portion of the chuck spindle. Fig. 8 is an elevation thereof.

Referring to the figures by characters of reference 1 designates a sleeve engaged fixedly by one end portion of a crank arm 2 the other end of which is provided with a knob 3 of the usual or any preferred construction. That end of the crank arm engaging the sleeve 1 is offset as shown at 1 and is engaged by a grip 5 disposed at right angles to the longitudinal center of the sleeve 1.

Mounted for rotation within the sleeve 1 is a tubular stem 6 extending from the center of a shallow cylindrical gear case 7 which bears upon the upper end of the sleeve 1. A ring or collar 8 is secured to the lower end of the stem 6 and anti-friction devices, such as balls 9, are interposed between this collar and the lower end of sleeve 1.

Formed within the inner face of the wall of the gear case 7 is a ball race 10 adapted to register with a similar race 11 formed upon the outer face of an internal annular gear 12 which is formed upon and depends from a disk 13 constituting the top of the gear case and which disk is provided, upon its periphery, with ratchet teeth or notches 1a. An opening 15 is formed in the wall of the gear case and anti-friction balls are adapted to be inserted through this opening into the registering races 10 and 11 so as thus to hold the gear 12 against displacementrelative to. the gear case and also to reduce friction between the parts. Opening 15 can be closed in any desired manner, as by means of a screw plug 16.

Secured upon the disk 13 is an arm 17 extending radially therebeyond and provided with depending side flanges 18 in which a shifting pin 19 is mounted to slide transversely. This pin is provided at each end with a head 20 whereby it can be manipulated readily and a cam-shaped recess 21 is formed longitudinally. within the middle portion of the pin and is adapted to receive the terminals of opposed pawls 22 which pawls project up to and normally engage the ratchet 14. A spring 23 is interposed between the pawls and serves to hold them normally in active positions. It will be apparent by referring to Fig. 5 thatwhen the pin '19 is shifted longitudinally in one dithe pin 19 is shifted in the opposite direction, the positions of the pawls are reversed. When pin 19 is in its intermediate position, as shown in Fig. 5, both of the pawls are in engagement with the ratchet and oscillation of the arm 17 relative to disk 13 is thus prevented.

That end of the arm 17 remote from the disk 13 is forked, as shown at 24 and is provided with guide ears 25 upon the top thereof while depending from the sides of the fork are cars 26 engaged by a clamping screw 27. This clamping screw has a small hand lever 28 extending from one end thereof whereby, by giving a slight movement to the lever 28 in one direction, the sides of the fork 24 will be shifted toward each other whereas, by moving the lever 28 in the opposite direction, said sides will be permitted to spring or move apart. When the sides of the fork are shifted toward each other,the ears 25 will clamp upon aslide 29 which constitutes an extension of the arm 17, this slide being provided at its outer end with a grip 30 made up of movably connected sections adapted to engage the intermediate portion of the crank arm 2. Inasmuch as this grip constitutes no part of the present invention, but has been fully described in the application of Samuel N. Hall hereinbefore referred to, it is not deemed necessary to describe or illustrate the same in detail in the present case.

at diametrically opposed points are guide sleeves 37 within each of which is slidably mounted a locking pin 38. The lower end of each pin is provided with a head 39 whereby it can be readily engaged and actuated while the opposed or upper end of each pin is normally seated in a notch 40 formed in the lower face of the disk 13. Each. pin 38 is provided, at an intermediate point, with a broad annular groove 41 which gradually increases in depth from its center to its sides and projecting into each groove is a spring finger 42 carried by the guide 37 in which the pin is mounted. This spring finger is adapted to be seated in either side or end portion of the groove 41 so as thus to hold the pin 38 in either raised or lowered position.

Extending from the sleeve 1 is an ear 43 having a notch 44 into which one of the pins 38 is adapted to project when withdrawn from the notch 40.

The lower end of the spindle 31 is cut away to provide a shoulder 45 and the terminal of the spindle is beveled as at 46. This spindle projects into and is secured .within the tubular chuck 47 the inner end of the chuck being provided with a head 48 spaced from the sleeve 1 and stem 6 by a series of anti-friction balls 49 and abearing disk 50 engaged by theballs. The chuck has a spring 51 secured to the outer side thereof by a screw 52 or the like, the lower or free end of the spring being provided with a beveled head 53. A sleeve 54 is mounted for rotation on the chuck and has an interior annular groove 55 into which the head'52 projects so that the sleeve is thus held against longitudinal movement relative to the chuck. That portion of the sleeve opposite the head 53 of the spring 51 is formed with a cam-shaped recess 56 so that, when the sleeve is rotated in one direction on the chuck, the spring 51 will be pressed inwardly whereas, when the sleeve 54 is rotated in the opposite direction, the spring will be released and permit the head 53 to shift outwardly.

The chuck is adapted to receive a bit or other tool indicated generally at 57 and which has its inner end reduced, as at 58 thus to lap the reduced end of the spindle 31. This tool 57 has a notch 59 so located that when the tool is in engagement with the spindle 31, the notch will be directly opposite the head 53. Consequently by giv- 'ing a short turn to the sleeve 54, the head 53 can be caused to shift into the notch 59 and thus lock the tool to the spindle 31.

However by rotating sleeve 54 in the oppotion of the balls in the races 10 and 11 will prevent the annular gear 12 from becoming displaced within the gear case and will also reduce friction between the parts. While the two pins 38 are seated in the notches 40, the disk 13 will be locked to the gear case with the result that, when the grip 30 is disengaged from crank arm 2 and is shifted inwardly toward disk 13,.the grip 5 canbe engaged by one hand, the knob 3 pressed against the body of the user, and the grip 30 employed for rotating disk 13 and the gear case. During this operation, the chuck will rotate once during each complete rotation of the gear case, the anti-friction balls 9 serving at this time to reduce friction. By withdrawing one of the pins 38 from its notch l0 and seating its lower end in the recess 44 in ear 48, the disk 13 will not only be held against rotation independently of the gear case 7, but said gear case will also be held against rotation independently of the sleeve 1 so that the chuck can thus be rotated by means of the crank arm 2 and in dependently of the grip 30 and the parts connected thereto. By now withdrawing the other pin 38 from its notch 4E0 the disk 13 will be released from the gear case so that, by disengaging grip 30 from crank arm 2, holding said grip in one hand and holding the grip 5 in the other hand, the disk 13 can be rotated by means of the grip 30 and motion will be transmitted from the annular gear 12 through gears 35 and 83 to gear 32, with the result that the speed of rotation oi spindle 31 will be multiplied, friction at this time being reduced by the balls 49.

Obviously by utilizing the pawls 22 and the pin 19, the brace can be used as a ratchet brace.

lVhat is claimed is 1. The combination with a sleeve, a tubular stem mounted for rotation therein, and a gear case revoluble with the stem, of a chuck spindle mounted for rotation within the stem, sp'eed multiplying gearing within the case for actuating the spindle, a crank arm connected to the sleeve, and means op erating independently of the crank arm for actuating the gearing.

2. The combination with a sleeve, a tuloular stem mounted for rotation therein, and a gear case revoluble with the stem, of a chuck spindle mounted for rotation within the stem, speed multiplying gearing within the case for actuating the spindle, a crank arm connected to the sleeve, means operating independently of the crank arm for actuating the gearing, and means carried by the gear case for engaging the sleeve to hold the case against rotation relative thereto.

3. The combination with a sleeve, a tubular stem mounted for rotation therein, and a gear case revoluble with the stem, of a chuck spindle mounted for rotation within the stem, speed multiplying gearing within the case for actuating the spindle, a crank arm connected to the sleeve, means operating independently of the crank arm for actuating the gearing, and means carried by the gear case for locking the gearing against operation Within the gear case, and means upon the sleeve for engagement by said locking means when the gearing is released, for holding the gear case against rotation relative to the sleeve.

4:. The combination with a sleeve, and a crank arm fixedly connected to the sleeve, said crank arm having an offset grip portion extending radially from the. sleeve, of a tubular stem mounted for rotation within the sleeve, a gear case carried thereby, a ratchet disk constituting a closure for the gear case, an internal gear depending from the ratchet disk and within the gear case, means for rotating said ratchet disk with or independently of the crank arm, a chuck spindle mounted for rotation within the tubular stem, gearing within the case for transmitting motion to the spindle from the internal gear, means carried by the gear case for engaging the disk to lock the gearing against operation, and means upon the sleeve for engagement by said locking means when the gearing is released, to hold. the gear case and stem against rotation relative to the sleeve during the rotation of the internal gear.

5. The combination with a sleeve, a crank arm fixedly connected thereto, of a tubular stem mounted for rotation within the sleeve, a gear case carried thereby, a disk constituting a closure for the gear case, an internal gear depending from and revoluble with the disk, said gear being located within the case, a chuck spindle mounted for rotation within the stem, a gear thereon, speed multiplying means within the gear case for transmitting motion from the internal gear to the spindle, a locking pin slidably mounted in the gear case and adapted to engage the disk to hold the gears against operation, and means upon the sleeve for engagement by the pin to hold the case against rotation relative to the sleeve when the gears are unlocked, and means for rotating the disk when the gears are disengaged.

In testimony that we claim the foregoing as our own, we have hereto affixed our signatures in the presence of two witnesses.

SAMUEL N. HALL. CARL M. PETERSEN. Witnesses:

IVY E. SIMrsoN, PHILOMENA A. ROGKELLI.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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