US64567A - Improvement in poweb hammees - Google Patents

Description

F. PRESTON. POWER HAMMER.

110.611,56?. Patented May. 7, 1867.

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IMPROVEMENT 1N" POWER EAMMERS.

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To ALL wHeM AI'r MAY colmena= Be it known thatI, THOMAS F. PRESTON, of Pawtucket, in the county of Providence, and State of Rhode Island, have invented a new' and improved Power Hammer; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specicatiomin 'which-4- Figure 1 is a side elevation of my improved power hammer. i `Figure 2 is a front elevation of the same.

Figure 3 is a horizontal sectional view ofthe same, the planejot' s'ectionbeing indicated bythe linexzv, iig. 1-

Figure 4 is'a detail sectional view taken on the line y y, iig. 3.

Similar letters of reference ,indicate corresponding parts. .y The object of this invention is to construct a power hammer in such a manner that thehammer will not ilap about loosely/,but that its motion will be perfectly steady7 and thatenoshock will beconimunicated to the worlt# ing parts above. The invention is chiefly intended as-an improvement on the hammer of- Thomas Shaw, vpatented February 27, 1866. 3

The improvement consists, first, in the useiof a rod for suspendingthe hammam-in placeiof the spring in Shaws hammer. The rod'is providedwvith a' shoulder,.ahove and below which spiral vsprings are arranged, which work between `the said shoulder and the respective ends of a. slot in .theupper-fportion et' thehammerl The lower one of these springs is compressed by the work, while the upper one prevents the violent shock ot' the hammer as it is brought down. Theimpcvemeat consists also in making the guides, wherein the hammer slides up and down, `in separate pieces, instead of casting them in one piece with the guide-brace, 'as in Shaws hammer. 'lhreby the said guides may be set up or adjusted as 4they become worn, while otherwise no accuracy whatever could be obtained.

A is the standard or support, made of cast iron o r other suitable material. y' The horizontal shaft B is mountedin suitable boxes arranged on the said standard, and is provided'with a crank-wheel, C. .By the crankpin a the connecting-rod D is attached to the wheel C, its lower end being pivoted to a rod, E, which is attached to the upper end of the hammer F. The said hammer F is provided, as shown' ingfl, with a slotted' upper` extension, the edges of which are provided with guide-rails, b, fitting into grooves Ain the adjustable' guides c. The rod E is within the slot in F provided with a shoulderer projecting ring or pin d, whereby two spiral Sp1-ings, e and f, are pressed respectivelyagainst the upper and lower enclosure of the slot during the movemcntsof the hammer. a hole in thc hammer. The guides c are lct into the guide-brace G, and are provided with a lipjon each end to During the downward stroke of the hammer, the lower end of the rod E is pressed into prevent their being moved up or down. Two (more oi' less) set-screwsh t'are used for the purpose of holding these guides in place,and at theproper distance from the hammer, so that thereby these guides can at all times be adjusted to the rails b on the hammer. In the drawing only one guide is represented, but in a working machine two have to bc used, one on either side -of the hammer.

i I claim as new, and desire to secure by Letters Patenty 1. The connecting-rods E and D, in combination with the springs e and f, shoulder d, and slotted hammer (orvext'ension of the same) F, substantially as and for the purpose herein shownl and described.

2. The construction and arrangement of the adjustable guide C, .let into the guide-brace G, and provided xvi'tha lip upon each end fitting over the upper and lower sides of said guide-brace G', its centre groored to receive the sliding guidc-rail b n the hammer F, substantially as`herein described and for the purpose specified.

i THOMAS F. PRESTON.

Witnesses:

WILLIAM J. ARNOLD, FRANcIs Foss.

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