US177724A

US177724A - Improvement in screw-drivers

Info

Publication number: US177724A
Authority: US
Publication date: 1876-05-23
Anticipated expiration: 1893-05-23

Description

i. F. KINGWILL.

SCREW-DRIVER.

No.177,7Z4. Patented May 23,1876.

Wiinessea: Inventor:

" UN TED STATES PATEN'I OFFICE.

JOHN F. KINGWILL, on CHICAGO, ILLINOIS.

IMPROVEMENT m SCREW-DRIVERS.

Specification forming part of Letters Patent No. 177,724, dated May 23, 1 876 application filed.

' March 15, 1876.

being bad to the accompanying drawing, forming part of this specification, in which Figure llis a front View; Fig. 2, View of (lriver without handle; Fig; 3,. horizontal section of Fig. 1 from Sto S.

My invention relates to screw-drivers; and consists in providing the handle with a ratchet-ferrule, and also in providing the blade with a pawl carrying a spring that is adjustable to either edge of the blade, to reverse the motion of the same in forcing the screw in or out of position, allowing the handle toremain stationary in the hand. v

1n the accompanying drawing, A represents the handle, of suitable material; B, ferrule, generally placed upon-- the lower endof the ,handle, to prevent the same from splitting, while-in this instance teeth are cut upon or in the lower edge, that receive the pawl 0, thus serving as an ordinary ferrule, and also as a ratchet. O is the blade, the upper end made round the distance it is to enter the handle, as represented by D; a, washer, fitting loosely on the rounded portion of the blade; b, stationary washer, secured to the rounded portion, forming a shoulder; d, spring, the desired length, one end of which is secured to than the top, engages firmly the washer a, carrying it back against the end of the handle, and holds the same firmly in position. shoulder 12, coming in contact with the washer, prevents the blade from disengaging the bandle, but allows it to turn in either direction when required. The pawl o is then secured to the blade, by riveting or othersuitable means, and the spring 01 attached to the pawl.

' When a person desires to force a screw into position, the lower end of the spring assumes the position represented in Fig.1. This opcration causes the end of the pawl to engage the teeth upon theferrule. The hand is then turned as far as convehient, and retains its hold upon the handle, turning the same to the point of starting; the pawl rides over the teeth, and when the hand again moves in the opposite direction, the pawl again engages the -teeth, and when a screw is to be withdrawn the lower end of the spring is carried over to the opposite side. (Indicated by dotted lines. shown in Fig.1.) This operation 'disengages the pawl upon that side, and causes it toengage the teeth upon the opposite side,when the operation is the same as above.

' It will be observed that the strain in driving the screw or drawing it is upon the ferrule,

and it the inner surface was smooth it would be liable to turn. To prevent this least one or more projections on the inside, that force their way into the wood where the ferrule is pressed on. Having thus described my invention, what I claim as new, and desire to secure by Let- The i