US68071A - fkank hartford - Google Patents

Description

@uiten tatss @attentV @fitta D. ,FRANK HARTFORD, -OF BOSTON, ASSIGNORTO `HIMSELF AND EDMUND TARBELL, OF SOUTH BOSTON, MASSACHUSETTS.

Letters Patent No. 68,071, dated August 27, 1867.

IMPROVED BOW-DRILL STOCK.

To ALL WHOMV 1T MAY eoNennN:

Be it known that I, D. AFRANK HARTFORD, ot' Boston, in the county of Suffolk, and State of Massachusetts, have invented certain new and useful improvements in Bow-Drill Stocks; and I do hereby declare that the folloiving is a full and exact description thereof, reference being had to the accompanying drawings, and'to the letters of' reference marked thereon. i

The lnature of my invention consists in combining with the spindle of a boxv-drill stoel; tivo string-pulleys, in such e. nua-nner that the reciprocating motion oi' the bow ivill cause the drill-stock te revolve in one direction only.

To enable others skilled in the art to make 'and use my invention, Iwill proceed to describe its construction anduse. In the drawingsi Figure 1 is a perspective View,

Figure 2 is a longitudinal section,

Figure 3 is an elevation of one of the string-pulleys.

Figure l)bis au isometrical perspective vien', showing a part of the drill-stock D and ratchet C of my improved bow-drill stock, one of the pulleys being removed se as to show the ratchet. i i

I construct my improved bow-drill stock as follows: A suitablehandle, II, is made of any desirable material, into the end of which a socket, L, is made, as shown in the drawings, or in any suitable or convenient manner. The object of this socket L is simplyto formagood journal into which the end of the drill-shank D may revolve freely. Firinly attached` to the shank D is a ratchet-wheel, O, (iig. 4,) upon both sides otv which the stringpulleys 'A A are placed. Into the faces of the string-pulleys A A', which come together, recesses are made, as shown 'in tige. 2 and 4. These recesses contain the ratchet O and pawls D B, with springsK K. One of the pawls B B is attached to theY pulley A, and the other to the pulley A, as show n'iin figs. 3 and 4. The string- 'pulleys A and A are free to revolve on the spindle D in one direction only, ais-the pawls B B check them from revolving in one direction unless the spindle Dyrevolves with them. The pulleys A A are checked from any longitudinal motion on the spindle D by means of the pins l? P', (iig. 2,),the ends of which `follow grooves made in the spindle D. V .Y

To operate my drill-stock I require a bow having two strings. One ei' the strings, S S, for instance, passes around the pulley A and leaves it from the upper side, While the other string S S passes :around the pulley A and leaves it from thel under side, so that, whichever Way ythe b ow is pushed, the pulleys A A revolve in opposite directions, butl as they are so arrangedthat revolving in one direction only can they operate upon the spindle D, it :follows thatD will alvvays revolve in the same direction, though the bor' may reciprocate.

Having thus described myiuventi'on, `I will proceed to 'set forth my claim.

What I claim as my invention, and desire to secure by Letters Patent of the United States, is-

Thc combination of the cord-pulleys A A,pawls-B B, ratchet C, with the mandrel D and handle H, when the whole is constructed as described andtorthe. purpose set forth. 4 i

` D. FRANK HARTFORD.

.Witnesses FRANK G. Pnnkns A.- HUN BERRY'.

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