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Publication numberUS1464824 A
Publication typeGrant
Publication dateAug 14, 1923
Filing dateMar 22, 1922
Priority dateMar 22, 1922
Publication numberUS 1464824 A, US 1464824A, US-A-1464824, US1464824 A, US1464824A
InventorsKollock George L, Martin Robert P
Original AssigneeElectric Hammer Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric hammer
US 1464824 A
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Description  (OCR text may contain errors)

Aug'. 14, 41923. 1,464.824

G. L.. KoLLocK ET AL ELECTRIC HAMMER Filed March 22, 1922 V vwamtoz.)

Patented Aug. 14, 1923.




Application led March 22, 1922. Serial No.l 545,819.

To all whom t may concern.

Be it known that we, GEORGE L. KoLLooK, a citizen of the United States, residing at Seattle, in the county of Kin and State of Washington, and ROBERT P. ARTIN, a citizen of the United States, residing at Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in Electric Hammers, the following being a'full, clear, and 'exact dis closure of the one form of our invention which we at present deem preferable.

For a detailed description of the present forni of our invention, reference may be had to the following specification and to the accompanying drawing, wherein- Fig. 1 is a longitudinal vertical section yof an electric hammer containing our invention and Fig. 2 is a horizontal section of the gearf in and cam.

ur invention resides in the expedient of two oppositely rotating bevel-gears having reversely-set cams which, although rotating in opposite directions co-operate to periodically lift and release the hammer against the forceof its operating spring. In the drawing A represents the shell of an electric hammer which may be made in separable parts convenient for assembling and replacin of the several members, as is now well {nown in the art. B is the armature of the operating electric motor, and C the ield magnet. lThe motor shaft extends axially of the machineand at its inner end is a bevel-pinion D which meshes with two parallel bevel gear-wheels E1, E2 and rotates them in opposite directions. Inside of each wheel is a two-ste cam H, the one shown in Fig. l being in tllie gear-wheel E1 and rotating in a clockwise direction. These cams act respectively in the projections, preferably rollers, rollers K1, K2 which project from the opposite sides of the hammer F and twice in each rotation they cooperatively lift the hammer against the force of its operating spring G and release it.` At each release the sprin forces the hammer out and causes it to give a sudden impact or blow upon the tool which may be includedy inthe chuck J at its extremit It will be observed that the gear-wheels E7 and E2 have rearwardly projecting stubshafts e1 and e2 which are journalled in bearings in the shell A. By this arrangement the space between the wheels is left free for the play of the inner end of hammer F and the rollers K1, K2 thereon.

What we claim as new and desire to secure by Letters Patent is:

13. An electric hammer, comprising an electric m'otor, a bevel-pinion on the motor shaft, two bevel gear-wheels both driven by the said pinion but in opposite directions, a hammer with projections on opposite sides thereof extended intov the space between the gear-wheels, an operating spring yfor the hammer, and oppositely-rotating cams on the adjacent sides of the respective gearwheels acting co-operatively on the said hammer projections. l

2. An electric hammer, comprising an electric motor, a bevel-pinion on the motor shaft, two bevel other with rear-si e journals therefor and both engaging the said pinion, a hammer with opposite projections thereon extended into the space betweenA the two gear-wheels, and oppositelyrotating cams on the inner sides of the respective gear-wheels acting co-operatively on the said hammer projections.

Sixgned at Seattle, county of King, State of ashington, this 10th day of March, 1922.


(gear-wheels facing eachA

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US2672707 *Mar 14, 1951Mar 23, 1954Abraham BernsteinNoisemaking toy tool
US2721491 *Mar 30, 1954Oct 25, 1955Joy Mfg CoImpact means for power-operated pipe wrench
US2794622 *Jul 8, 1953Jun 4, 1957Phillips Drill CoHolder for self-drilling expansion shells and the like
US2834384 *Aug 2, 1955May 13, 1958Cascades Plywood CorpVeneer joggers and jointers
US2905034 *Apr 18, 1958Sep 22, 1959Turner Ralph MReciprocatory impact hand tool
US3489936 *Jun 14, 1967Jan 13, 1970Gen ElectricToothbrush with motion selector button
US3681726 *May 27, 1971Aug 1, 1972Moog IncElectromagneto-mechanical actuator
US3747691 *Feb 9, 1971Jul 24, 1973Lundman OStriking machine
US4732220 *May 16, 1984Mar 22, 1988Marcus Komponenter AbApparatus for briefly and impulsively releasing mechanical energy
US5046374 *Mar 27, 1990Sep 10, 1991Coors Brewing CompanyApparatus for preforming work
US5134874 *Sep 9, 1991Aug 4, 1992Coors Brewing CompanyMethod for performing work
US7581484 *Aug 22, 2006Sep 1, 2009The United States Of America As Represented By The Secretary Of The ArmyWeapon system retention device
US7874839 *Feb 15, 2007Jan 25, 2011Westport Medical, Inc.Powered surgical instruments
US8517730 *Dec 31, 2009Aug 27, 2013King Saud UniversityTooth extraction tool
US20110159459 *Dec 31, 2009Jun 30, 2011Saied Mohamed Hassan DarwishTooth extraction tool
USRE29081 *Nov 28, 1975Dec 14, 1976Moog Inc.Electromagneto-mechanical actuator
U.S. Classification74/55, 310/80, 173/203, 433/121
International ClassificationB25D11/10, B25D11/00
Cooperative ClassificationB25D11/10
European ClassificationB25D11/10