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Publication numberUS1647493 A
Publication typeGrant
Publication dateNov 1, 1927
Filing dateOct 10, 1924
Priority dateOct 10, 1924
Publication numberUS 1647493 A, US 1647493A, US-A-1647493, US1647493 A, US1647493A
InventorsFrank A Young
Original AssigneeKenneth S Startup
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Power hammer
US 1647493 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Nov. 1927..

F. A. YOUNG POWER HAMMER Filed Oct. 10. 1924 v lNvENToR @17H/ BY ,Y

ATTORNEY Patented Nov. l, 1927.


A y 1,611,493A PATENT oFFlcE.



AApplication led October 10, 1924. Serial No. 742,854.

`This invention relates to power operated forging hammers; and its object is to provide a machine of this character which 'wlll be of simple and inexpensive construction, efficient in operation and include mechanism whereby the hammerv strokes may be completely controlled. p

The invention consists in the novel construction, adaptation and comblnation of Y 1c parts hereinafter described and claimed.

In the accompanying drawing,-

Figure 1 is avfront elevation of a power hammer embodying the invention, partly broken away and partly in section to show details of construct-ion; and Fig. 2 avertical section taken substantially on l1ne 2-2 of Fig. l. .i In said drawing, the reference numeral 5 represents' generally, a rigid frame which sup orts all of the Working parts of the macIhine and is supported in an elevated position, as for example, upon the Joists 6 of a building. As illustrated, said frame comprises a base element 7 and pairs of ost elements 8 and 9 which are surmounte by a top element 10. 11 represents a hammer-v head which is guided for vertical movements in a tube 12 which depends from the frame element 7.

Said hammer-head is secured to the lower end of a stem 13, preferably a board ofhhard wood', said stem passing upwardly between the complementary members 14-15v and 16-17 of two pairs of friction rolls.

These rolls are keyed or otherwise secured upon shafts 141, 151, 161 and 171 to whlch are also secured pulleys 142, 152, 162, and 172, about which, anda supplementar pulley 1.9

asses a power driven belt 20 w ereby said friction rolls are rotated as indlcated by direction arrows in Fig. 1.1

Theshaft 141 is journaled in ,eccentrlc sleeves, such as 21, mounted in bearings provided in the frame posts Sand, in like manner, the shaft 161 is journaled in eccentric sleeves 22 mounted in bearings provlded 1n the frame posts 9.

The shaft 151 of the roll 15, which 1s opposed to roll 14, is journaled in bearings provided in the lower ends of arms 23 which are swingably mounted upon the sleeves 22 in which the shaft 161 is journaled. The shaft 171 is journaled in the upper ends of arms, as 24, whose lower ends are swmgably the operator standing upon the lfloor 30 adjacent to the machine anvil whichl is designated by 31. t

Included in the invention are devices for engaging the stem 13 to retain the hammer at a selected elevated position.

As shown, said devices consist of a pair of blocks 32-321, one at each side of the hammer stem, mounted upon the machine frame for movementtoward and from the stem. To such end, I provide headed screw bolts 33 passin through slots in the respective blocks an engaging in screw threaded holes provided in t-he frame. .The blocks may be controlled by any known or suitable means, as illustrated the controlling means comprises a lever 34 fulcrumed at 35 to the block 32 and intermediate its length is pivotally connected at 36 to ends of links 37 whose otherends are pivotally connected at 38 rto the block 321. i

39 represent springs connected, as shown,

to the lever 34 and tending to act through' the medium ofthe lever 34 and links 37 to cause the blocks 32 and 321 to be yieldingly held in disengaged relation with respect to the lhammer stem.

, To effect the engagement` of the stem by u the blocks the latter are influenced by regulatlng the lever and links above referred to by means of a pull rope 40 attached to the lever 34 and passing over a guidel sheave 41 to within convenient reach of the operator. The operatlon of the invention maybe explained as follows: When the rope 4U 1s pulled down by theI operator, the blocks 32.

left hand side of Fig. 1 the arms 23 and 24 are correspondingly swung to cause the friction roll 15 to be moved from the hammer stem 13 and the roll 17 to be brought against said stem which is thereby pushed against the roll '16 whereuponthe frictional action of the rolls on opposite sides ofthe stem act to elevate the hammer.

lVhen the roll 17 is retracted by a reverse swing of the lever 28, such as will move the links 26 toward the right hand, the hammer lstem is first released from the rolls 16 and 17 and subsequently frictionally engaged between the rolls 14 and l5, resulting in tue hammer being first allowed to fall by its own gravitation and then accelerated in its downward travel by the power imparted theretov from the belt driven rolls 14 and 15. If it is desired to operate themachine to impart a series of rapidly delivered hammer blows, the lever 28 is manipulated to cause the opposing rolls 14-15 and 16-17 to be alternatelyd brought into engagement with the hammer stem. Slower blows are slip for the purpose of obviating shocks and jars' when either pairs of rolls is brought into engaging relation with the hammer steinA 13.

The operation of the'invention will, it is believed, be understood from the foregoing.

-While l have illustrated a construction now preferred by me, ll do not wish to be understood as conning myself specically thereto except as limited by the appended 'claims Lerares What l claim is,- 1. In a power-hammer, a hammer-head, a stem therefor, two friction-rolls .disposed at different elevations at opposite sides of saidv steln, shafts for said rolls, eccentric sleeves serving as bearings for the respective shafts, a frame in which said sleeves are mounted, means .for securing the sleeves in adjusted rotary positions, two pairs of arms pivotally supported at one 'end of each to the respective sleeves, shafts journaled in the 4free ends of said arms, 'frictionrolls carried by the last named shafts and arranged in opposed relations with the first named rolls, ya pulley provided on each of said shafts, a belt passing about the pulleys for driving all of the rolls, links connecting one pair of said arms withx the other pair of arms,.and means opveratively connected with said arms for regu lating the latter' to cause the upper and lower of said rolls selectively to be engaged with said stem for imparting upward and down'- ward motion predeterminately to the hammer-head.

2. In a power hammer, a hammer-head, a stem therefor, two friction-rolls disposedat different elevations at opposite sides of said stem, shafts for said rolls, a frame provided with journal Vbearings for said shafts, two pairs of arms pivotally connected at one enclof each to said frame, shafts journalled in the free ends of saidlarms, friction-rolls carried by the last named shafts and arranged in opposed relations with the first named rolls, a pulley provided on each of said shafts, a belt passing about the pulleys for driving all of the rolls, links connecting one ypair of said arms with the other pair of day ,of September, ll9241-b :annua a. reune. l

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US7503401Mar 31, 2005Mar 17, 2009Black & Decker Inc.Solenoid positioning methodology
US7556184Jun 11, 2007Jul 7, 2009Black & Decker Inc.Profile lifter for a nailer
US7686199Mar 31, 2005Mar 30, 2010Black & Decker Inc.Lower bumper configuration for a power tool
US7726536Mar 31, 2005Jun 1, 2010Black & Decker Inc.Upper bumper configuration for a power tool
US7789169Mar 31, 2005Sep 7, 2010Black & Decker Inc.Driver configuration for a power tool
US7975893Mar 31, 2005Jul 12, 2011Black & Decker Inc.Return cord assembly for a power tool
US8011549Mar 31, 2005Sep 6, 2011Black & Decker Inc.Flywheel configuration for a power tool
US8123099Mar 31, 2005Feb 28, 2012Black & Decker Inc.Cam and clutch configuration for a power tool
US8231039Mar 31, 2005Jul 31, 2012Black & Decker Inc.Structural backbone/motor mount for a power tool
US8302833Oct 25, 2006Nov 6, 2012Black & Decker Inc.Power take off for cordless nailer
US9486905Jul 23, 2013Nov 8, 2016Black & Decker Inc.Driving tool with controller having microswitch for controlling operation of motor
WO1983002082A1 *Dec 10, 1981Jun 23, 1983Cunningham, James, D.Electrically driven impact tool and method of operating the same
U.S. Classification74/25, 173/122
International ClassificationB21J7/36
Cooperative ClassificationB21J7/42
European ClassificationB21J7/42