US772593A

US772593A - Screw-driver.

Info

Publication number: US772593A
Application number: US20838404A
Authority: US
Inventors: Paul A Wagner
Original assignee: Individual
Current assignee: Individual
Priority date: 1904-05-17
Filing date: 1904-05-17
Publication date: 1904-10-18
Anticipated expiration: 1921-10-18

Description

PATBNTED 00T. 18, 1904.,

- il@ y P.. A. WAGNER I I SCREW DRIVER. 2111110111011 vFILED MAY 1v, 1904.

I. I A.

Patented October 18, 1904.-

PATENT OFFICE.

PAUL A. WAGNER, 0E cARLsTADT, NEW JERSEY.

SCREW-DRIVER.

SPECIFICATION forming part of Letters` Patent No. 772,593, dated October 18, 1904..

` Application liled May 1'7, 1904. Serial No. 208,384. (No model.)

To a/Zlwhom, 'it may concern:

Be it known that I, PAUL A. WAGNER, acitizen of the United States, residing at Carlstadt, in the county of Bergen and State of New Jersey, have invented a certain new and useful Improvement in Screw Drivers, of which the following' is a specification.

The invention relates to screw-drivers in which the blade is separable from the handle; and the object of the invention is to provide means whereby the lblade shall be eliiciently held to resist the torsional strains and end thrust to which a tool'of this character is subjected and for permitting the easyseparation of blade and handle when desired.

The invention consists in -certain novel features and arrangements of parts by which the above objects are attained to be hereinafter described.

The accompanying drawings form a part of v this specification and show an approved mannal section of the metal bushingforming thel interior of the handle; and Fig. 6 isan elevation of one of the halves of the bushing, show-- ing the holding-spring in position. Fig. 7 is on a larger scale and shows a cross-section through'the bushing on the line 7'7 in Fig. 5. Similar lettersl lof reference indicate the same parts in all the figures.

A is the body of thehandle, which may be of wood and of any preferred shape. It isformed with a cylindrical cavity extending through the neck A axially into the body, in

'which is received a tightly-fitting tubular bushing of metal, `made preferably in longitudinal halves, each the counterpart of the other. Each semicylindrical half B is pro vided'onits edges or margins with lips B', matching to rabbets on the other, and with a wall B2 at the lower end, forming when the halves are assembled a closed bottom for the tube or bushing. Extending longitudinally of the bushing along the central line of each l half` on its interior is a groove'b'. The two channels thus formed lie diametrically opposite each other and at a right angle to the line of junction of the halves. The bushing is also provided on each side with an open slot b', formed by recessing the abutting edges of each half, and C is a fiat metal or leaf spring of a width to match to the width of the slots and received in one of the latter. Itis curved to project into the interior of the'bushingat about the mid-length. the flat ends' of the spring being received in cavities b2 b2, formed on the exterior of the bushing, as shown.

Mis the shaft or blade of the screw-driver,

cylindrical in cross-section and drawn or otherwise flattened at each end to form properlyshaped bits or points M M', adapted to engage the usual slot in a screw-head. The'engaging edges of the points may be each ofv the same length, as shown, but are preferably diferent to serve with different sizes of screws. In either case the flattened portion M2 must be of a Width to enter the grooves b of the bushing and engage therein, and the shaft should fit the tubular interior of the bushing closely enough to be firmly supported thereby. The blade is engaged in the handle by forcing one of the points thus entered firmly home against the bottom of the bushing, the grasp of the spring C upon the shaft serving to hold the blade with sufficient force to prevent its laccidental release, but permit its withdrawal when 4desired.

D is a ferrule driven upon the upper end or neck of the handle to reinforce this portion and provide an attractive finish. y

Before inserting the bushing it may be coated with a suitable cement, aiding to resist the tendency to turn in the handle when the tool is in use. in this respect by permitting the material of the handle to expand therein when the bush-- The slots b b/ serve usefully- IOO Other means than the spring C may be employed to provide the required friction for holding the blade, and the slots b' may be omitted. rI he bushing may be cast in a single piece or may be cutfrom a suitably-formed tube, the bottom B2 being simply a circular disk inserted in the recess in the handle below such tube. The grooves b may extend only part of the length of the bushing.

I claiml. A screw-driver blade comprising a cylindrical shaft having a iiattened screw-engaging point at each end wider than such shaft, in combination with a handle having a longitudinal recess therein, a tubular bushing in said recess having a diameter to match to said shaft, and interior grooves receiving the widened portions of one of said points, and an abutment in said recess for receiving the end thrust of said blade.

2. Ascrew-driver blade comprisinga cylindrical shaft having a flattened screw-engaging point at each end Wider than such shaft, in combination With a handle having a longitudinal recess therein, a tubular bushing in-said recess having a diameter to match to said shaft, and interior grooves receiving the widened portions of one of said points, an abutment in said recess for receiving the end thrust of said blade, and a spring in said bushing arranged to impinge against an inclosed portion of said blade.

3. A screw-driver blade comprising a cylindrical shaft having a iiattened screw-engaging point at each end wider than such shaft, in combination with a handle having a longitudinal recess therein, a tubular bushing in said recess having a diameter to match to said shaft. and interior grooves receiving the widened portions of one of said points, an abutment in said recess for receiving the end thrust of said blade, the said bushing having a slot in-its Wall, and a curved leaf-spring lying in said slot and impinging against said shaft.

4. A tool-handle having a recess extending a portion of its length, a tubular bushing held in such recess and divided longitudinally into two parts, alongitudinally-extending groove formed on the interior of each of such semicylindrical parts, a longitudinally-extending slot in said bushing on the line of junction of said parts, formed partly in cach, a lip on each edge of each of said parts matching to a rahbet on the other, a spring extending' through said slot, and a closed bottom for said bushing formed partly on each of said parts, all arranged to serve with a screw-driver blade having a cylindrical shaft and a iiattened screw-engaging` point at each end adapted to engage in said grooves and abut against said bottom.

In testimony that I claim the invention above set forth I afliX my signature .in presence of two witnesses.

PAUL A. WAGNER.

Witnesses:

CHARLES R. SEARLE, F. E. EocARTI-L