US1017916A - Power-hammer. - Google Patents

Description

G. H. ROWE.

POWER HAMMER. APPLIoAiIoN FILED 00T. a1. 1910.

1,017,916. Patented Feb.20, 1912.

CDLUMBIA PLANOGRAPH co..v{^SH1NG1uN. D. c.

UNTTED sTATEs PATENT oEEioE.

GEORGE H. ROWE, OF IBERWYN, ILLINOIS, ASSIGNOR TO THE ELECTROMAGNETIC TOOL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

POWER-HAMMER.

To all 'whom t may concern.'

Be it known that I, GEORGE I-I. RowE, citizen of the United States, residing at Berwyn, in the county of Cook and Sta-te of Illinois, have invented a certain new and useful Improvement in Power-Hammers, of which the following is a full, clear, concise, and exact description.

My invention relates to t-hat class of power or drop hammers in which the blow of the mechanically reciprocated driving piston upon the piston of the ram or hammer is cushioned by air, the air space in the cylinder being provided with a valve controlled by the user.

My invention, speaking generally, consists in providing a solenoid about the cylinder, in order that the position and action of the hammer piston within the cylinder may be under magnetic influence, and the position thereof, and hence the length of the stroke of the hammer may be regulated by varying the strength of the current traversing the coils of the solenoid. I also provide for regulating the density of the air cushion thereby also regulating the length of stroke of the hammer. In combining the regulation of the air cushion and t-he strength of the current traversing the heliX the length of the stroke of the hammer and consequently the intensity of the blow is linely regulated at the will of the user.

My invention will be more readily understood by reference to the accompanying dra-wing7 in which- Figure 1 is a front view showing the posit-ion of the piston, in dotted lines; Fig. 2

is an enlarged fragmentary vertical section.

Like parts are indicated by similar character's of reference throughout the views.

I have shown the crank disk 1 with its connecting rod or pitman 2 for reciprocating the driving piston 3. Suitable split packing rings 4, 4l, 4L are provided in the piston 3. The space 5 is provided between the driving piston 3 and the driven or hammer piston 6, the density of the air cushion being controlled by a valve 7. Oil grooves are provided as shown in the drivenpiston 6, in the well-known way. In this way the density of the air cushion and hence the intensity of the blow may be regulated.

The cylinder 8 may be of cast iron. It is cut away at 9, 9, 9, 9 in order that the resistance of the field of force may be in- Specication of Letters Patent.

Application led October 31, 1910.

Patented Feb. 20, 1912.

Serial No. 589,876.

creased, that is to say, these openings are preferably provided between the core or armature 6 (which also serves as vthe hammer piston) and the surrounding solenoid or electrcmagnet coil or helix 10. The hammer 11 works in grooves provided in the guide blocks 12, 12 as shown. The anvil 13 is in' proper position upon. the anvil block. The rheostat or resistance box 14 is provided for regulating the strength of the current in the solenoid. The lever being readily controlled by the treadle 15.

It will be seen that thev intensity of the blows of the hammer will be determined by the length of the stroke; the user has two cooperating means for thus regulating the length of the stroke, first, by means of the valve 7 connected with the air space 5 and, second, by means of the said rheostat.

Referring to the crank disk, it will be seen that in its revolution the driven piston is reciprocated in the cylinder to carry the hammer piston down belowv its normal suspended position and on the return stroke upwardly above such intermediate position. In lifting the hammer, the lirst part of the upward stroke is assisted by the action of the solenoid thereon and thus power is exerted over and above the atmospheric pressure until the hammer piston has passed upwardly above its normal or intermediate position; the suction of the air aided by the momentum acquired will carry the piston and consequently the hammer somewhat above this normal intermediate position.

It will be understood that the cuttingaway of the cylinder 8 at points 9 is for the purpose of increasing the reluctance of the magnetic circuit, as is well understood.

The plunger or core 6 would normally occupy what is actually its intermediate position, such latter position being that shown in the drawings. Hence upon a downward stroke being completed and the piston 3 being retracted, the piston 6 is drawn up into the solenoid, in a well understood manner. There being a magnetic attraction between the two pistons, the piston 3 in its backward stroke tends to partially withdraw with it the piston 6, and thus elevates the piston 6 above what would be its normal position. The extent to which the piston 6 is thus elevated and hence the length of the stroke is dependent upon the degree of energization of the solenoid 10.

I claim- 1. The combination with a cylinder, of a driving piston and a driven piston working in the cylinder, an air space being provided between the said pistons7 a solenoid surrounding the cylinder, the driven piston being the core of said solenoid, said solenoid being adapted when traversed by current to hold said driven piston in an intermediate suspended Heating position, the driving piston, when reciprocated, acting through the medium of the air cushion formed in the said space to operate the driven piston, and a tool carried by said driven piston,

2. The combination with a cylinder and a solenoid surrounding the same, of a. reciprocating hammer and its piston, adapted to be held suspended by the magnetic action of the solenoid when traversed by current, means under the control ot the user tor varying the strength oit said current to regulate the position ot the hammer, an air space being provided in the cylinder above the said piston, and a mechanically recip rocated piston acting, through the medium of the air forming a cushion in said space, upon the hammer to operate the same.

3. The combination in a power hammer mechanism, of a piston and a hammer carried thereby7 a solenoid surrounding the piston, said solenoid when traversed by current being adapted to hold the hammer in a suspended or tioating position, and means for Varying the strength oit the solenoid to regulate the lengt-h of the stroke and intensity o'l' the blow substantially as and for the purpose specified.

Ll. The combination of a driven connecting rod and a` piston reeiprocated thereby7 a hammer and its piston, a cylinder having an air space therein between said pistons. a valve under the control of the user for regulating the air cushion :termed between said piston, a solenoid, the hammer piston being of iron and serving as the core or armature of said solenoid which surrounds the said piston, and means for varying the strength of said solenoid whereby the length ot' stroke and consequent intensity of the blow of the hammer may be controlled by the riser7 substantially as and for the purpose specified.

5. The combination with a cylinder, of a mechanically driven piston arranged to reciprocate therein7 a solenoid surrounding said cylinder beyond the end of the forward stroke of said piston, a second piston in said cylinder, said second piston constitnting a core for said solenoid, and a tool can4 ried by said second piston.

6. The combination with an iron cylinder, ot a lmechanically driven piston of magnetic material arranged to reciprocate there inv`v a solenoid surrounding said cylinder beyond the end ot the forward stroke oi' said piston. a second piston of magnetic material iitting in said cylinder in proX- imity to said solenoid, and a tool carried by said second piston.

7. The combination with an iron cylinder'.y ot a mechanically driven iron piston arranged to reciprocate in said cylinder, a solenoid surrounding said cylinder beyond the end ot' the forward stroke of said pis ton, a second iron piston iitting in said cyl inder and constituting a movable core for said solenoid, said second piston being arranged to be driven by said first mentioned piston, said cylinder being provided with openings about` its cirenniference at approximately the point at which the inner face of the second piston is designed to be driven, and a tool carried by said second piston.

In witness whereof7 l, hereunto subscribe my name this 29th day of Oct-ober, A. D., 1910.

GEORGE H. ROWE. lli/'itnesses Geenen P. BARTON,' MGCLELLAND YOUNG.

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

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