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Publication numberUS919156 A
Publication typeGrant
Publication dateApr 20, 1909
Filing dateAug 15, 1908
Priority dateAug 15, 1908
Publication numberUS 919156 A, US 919156A, US-A-919156, US919156 A, US919156A
InventorsCharles B Gilmore
Original AssigneeJohn F White, Charles B Gilmore
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Bit-stock.
US 919156 A
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Description  (OCR text may contain errors)

O. B. GILMORE.

BIT STOCK. APPLICATION FILED AUG. 15, 1908.

91 9, 1 56, Patefite d Apr.20, 1909.

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UNITED STATES PATENT oEEroE.

CHARLES B. GILMORE, OF SPRINGFIELD, ILLINOIS, ASSIGNOR OF ONE-HALF TO JOHN F. WHITE, OF BLOOMINGTON, ILLINOIS.

BIT-STOCK.

To all whom it may concern:

Be it known that I, OHARLEs B. GILMORE, citizen of the United States, residing at Springfield, in the county of Sangamon and State of Illinois, have invented certain new and useful Improvements in Bit-Stocks, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to a bit stock and has especial reference to the driving mechanism therefor.

The invention includes a driver having a bit and means associated therewith for accelerating the speed of the bit and the driver carried thereby, and mechanism for releasing the o crating connection of said first mentione means, whereby the driver may be driven directly from the handle of the instrument.

The invention also contem lates a tool of the character described whic may be operated and adjusted by a single hand'of the user.

More particularly the invention comprises a handle, a bit, a differential gear mechanism for the bit, an operative member for the latter, and a clutch member adapted to release the operative connection of the differential gear and couple the handle directly to the bit, with means for normally retaining said clutch in an inactive position.

The arrangement of parts and the novel details of construction will be pointed out in the description hereinafter, reference being directed in this connection to the accompanying sheet of drawings forming a part ereof, and wherein a preferred embodiment of the invention is disclosed for the of illustration.

In the said drawings, Figure 1 is a longitudinal section, and Fig. 2 is a transverse section on the line II3C6 of Fig. 1.

Referring now more particularly to the drawing, in which like reference characters denote corresponding parts throughout the several views, 1 is a casing having an inwardly turned annular flange 2 at its inner terminal. Mounted to slide longitudinally of the casing is a cap member 3, which is conveniently formed cup-shaped, with the purpose Specification of Letters Patent.

Application filed August 15, 1908.

Patented April 20, 1909.

Serial No. 448,676.

annular flange thereof loosely engaging the inner surface of the casing, and the body 3 constituting the closing means for the outer end of the casing 1. A transverse partition or abutment 4 is provided within the casing intermediate its ends and is apertured for the loose reception of the shank or bit 5 of a screw driver or the like 5, it being within the contemplation of my invention to use tools other than screw drivers. I The bit 5' proj ects without the inner end of the casing and terminates in an enlargement at its opposite end having a shoulder 5 engaging over said partition. To the opposite side of the partition a gear wheel 6 is keyed to the bit 5 7 is a tubular sleeve rotatably mounted upon the bit 5 and extending through the inner end of the casing, an enlargement 7 b of which constituting with the annular flange 2 a retaining wall for ball-bearings 8. An annular flange 9 is provided at the opposite end of the tubular member 7 and constitutes a support for rotatable gear wheels 10 arranged to mesh respectively with the gear wheel 6 upon the bit 5 and an internal annular gear 11 upon the casing. The enlargement 7 is preferably serrated or notched whereby the fingers of the operator may ob tain a firm grip thereon and thereby rotate the differential gears to impart to the bit and the part carried thereby a high speed.

From the description thus far it will be observed that the tool is double acting or reversible in that the screw driver may be rotated in either direction at a high speed, and with but one hand of the user. In operation the palm of the hand is grasped about the handle 1 with the forefinger and thumb in engagement with the operating end 7 b of the tubular member '7, movement being imparted to said tubular member through the medium of the forefinger and thumb with the result that the driver is actuated at an accelerated speed in either direction.

As before described the cap member 3 is slidably mounted within the casing 1. It has a pin and slot connection 12 with the casing which constitutes a guide for the cap and means for limiting its movement in either direction. A spring 13 is inserted in the casing between the partition 4 and cap 3 and normally tends to hold the latter in its outward position. The cap 3 is also provided with a clutch face 14 arranged to engage when in innermost position a complementary clutch face 15 upon the end of the oit 5 In the normal operation of the tool it will be noted that motion is imparted to the bit 5 through the medium of the interposed differential ear. When, however, it is desired to release the gear-connection and lock the parts together it is only necessary to push the cap member 3 inwardly against the action of the spring until the clutch face thereof engages the complementary clutch face on the bit, when direct movement from the casing 1 to the bit 5 may be had.

I claim:

1. In a tool of the character described a handle comprising a tubular casing having an internal annular gear intermediate its ends, a bit shank projecting at its lower end without the casing and otherwise inclosed by said casing, the bit shank having intermediate its ends gearing to cooperate with said first mentioned gear and a clutch member movably connected with the upper end of said casing and arranged to connect directly with said shank at a point above the gearing and within the casing.

2. In a tool of the character described, a handle comprising a tubular casing open at its respective ends, a bit shank projecting through the lower end ofthe casing and having a geared connection with the casing and means whereby the bit shank may have an independent connection with the casing comprising a clutchface upon the bit shank, and an auxiliary clutch member sleeved within the opening at the rear end of the casing and having a pin and slot connection with said casing.

3. A tool comprising a casing adapted to be grasped by the palm of the hand of the user, a bit, means for connecting the bit to the casing whereby the bit may be rotated by the casing, means whereby the casing may be released from said connection, a differential gear'for the bit, the said gear being arranged within the casing and iii-closed thereby, and an actuating device forthe gear independent of the casing and constructed and arranged to be operated bythe thumb and forefinger of the hand of the user.

4. A tool comprising a bit, a handle, means for coupling the bit to the handle for direct action, automatic means ior'releasing said coupling, and independent means for rotating the bit at an increased speed.

5. A tool comprising a bit shank, a handle, difier'ential gearing. within the handle for operating the shank, means extending without the handle and independent of the latter for operating the differential gearing to rotate the shank at a high speed, and means for coupling the handle directly to the bit shank and locking the diiierential gearing comprising a clutch member slidably mounted within the handle, and constituting a closure for one end of the handle.

6. A tool comprising a bit shank, a gear upon the bit shank, a casing hating an internal annular gear, a tubular member sleeved upon the bit shank and having a gear wheel arranged to mesh with the annular gear of the casing and the gear of the bit shank respectively, and said tubular mem her having an operating member extending without the casing.

7. A tool comprising a bit shank, a gear upon the bit shank, a casing having an internal annular gear, a tubular member sleeved upon the bit shank and having a gear wheel arranged to mesh with the annular gear of the casing and the gear of the bit respectively, said tubular member having an operating member extending without the casing, and means ior locking each of said parts together and to the handle whereby the bit may be op e-rated directly from the handle.

8. A tool of the character described comprising a bit shank having at its inner end an integral clutch member and a gear wheel intermediate its ends, a casing, gearing interposed between said gear wheel and casing, and a clutch member complementary to the clutch member of the bit shank carried by and movable relative to the casing,

9. A tool comprising a tubular casing con stituting a handle having an opening at its opposite ends, a bit shank projecting through one of said openings, gearing interposed between the inner wall of the casing and shank,

an operating member independent of the handle projecting without the casing for rotating the shank through said gearing, and a clutch member slidably connected with said casing for direct connection with the shank, the clutch having an operating part projecting through the other opening of the casing.

10. A tool comprising a tubular casing open at its respective ends, a bit shank fitting within one of said openings and projecting therewithout at one end, an integral clutch at the opposite end of the bit shank within the casing, a cooperating clutch member between the casing and said shank clutch for operating the-shank directly, the said cooperating clutch having an operating part extending without the other opening of the casing, an interposed differential gear for operating the shank at a diilerent speed, and means for operating the latter.

11. A tool comprising a tubular casing open at its lower end, a bit shank fitting within the casing and projecting therewithout at the lower end, an integral clutch at the opposite end of the bit shank within the tween the casing and said shank clutch for in presence of two witnesses.

operatin the shank directly means for 1 T normalb holding said clutch members sep- CHARLES arated, an interposed differential gear for Witnesses: operating the shank at a different speed, and f HERBERT D. WINQr-IELL, means for operating the latter. CHAs. L. HINES.

easing, a cooperating clutch member be- I In testimony whereof I affix my signature I i

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2477528 *Dec 31, 1946Jul 26, 1949Richard RonneVariable-speed hand tool
US2721591 *Feb 17, 1953Oct 25, 1955Walter H CriswellGeared screw driver
US5289743 *Apr 26, 1993Mar 1, 1994Salvatore CiramiTwo-speed reduction geared screwdriver
US7849766May 14, 2008Dec 14, 2010Stryker SpineSpeed multiply screwdriver handle
US7987745 *Jan 16, 2009Aug 2, 2011Gauthier Biomedical, Inc.Variable gear ratio ratchet
US8122788 *Jan 18, 2010Feb 28, 2012Gauthier Biomedical, Inc.Variable gear ratio ratchet
US8468914 *Aug 4, 2010Jun 25, 2013Gauthier Biomedical, Inc.Variable gear ratio ratchet
US20100294084 *Aug 4, 2010Nov 25, 2010Gauthier Michael TVariable Gear Ratio Ratchet
WO2008143874A1 *May 14, 2008Nov 27, 2008Stryker SpineSpeed multiply screwdriver handle
Classifications
Cooperative ClassificationB25B17/00