US2206364A

US2206364A - Screw driver attachment

Info

Publication number: US2206364A
Application number: US213511A
Authority: US
Inventors: John N Petre
Original assignee: PARK METALWARE CO Inc
Current assignee: PARK METALWARE CO Inc
Priority date: 1938-06-13
Filing date: 1938-06-13
Publication date: 1940-07-02
Anticipated expiration: 1957-07-02

Description

July 2, 1940. J. N. PETRE 2,206,364

SCREW DRIVER ATTACHMENT Filed June 15, 1938 D t INVENTOR BY 4% ./am'f. WITNEESfi y ATTORNEYS Patented July 2 1940 Uni-rep STATES PATENT OFFICE SCREW DRIVER ATTACHMENT Application June13, 1938, Serial No. 213,511

3 Claims.

The invention relates to a screw driver attachment and more especially to a screw holding screw driver.

The primary object of the invention is the provision of a tool of this character, wherein the runner or sleeve slidably fitting the shank of such tool has interlocked with said runner or sleeve the arms of a pair of gripping members, these being engageable with a screw when the screw driver is set thereto for the working of the screw home or its removal from a piece of work.

Another object of the invention is the provision of a tool of this character, wherein a fastener, such as a headed or non-headed screw, can be firmly gripped and held to the work irrespective of the condition of the screw driver receiving notch or slot as provided therein so that successful operation of the tool may be had for the insertion or removal of the fastener of screw type into or from a piece of work.

A further objector the invention is the provision of a tool of this character, wherein the runner or sleeve frictionally embracing the shank of the screw driver or the like will remain in place anywhere of the major length of such shank so that the spring holder for the screw or the like can be above, "below or exactly at the tip of the screw driver.

A still further object of the invention is the provision of a tool of this character, which is extremely simple in construction, readily and easily adjusted, thoroughly reliable and efiicient in operation, assuring the positive gripping of a screw or the like to be operated upon by the tool, strong, durable, and inexpensive to manufacture.

'With these and other objects in view, the invention consists in the features of construction, combination and arrangement of parts as will be hereinafter more fully described, as illustrated in the accompanying drawing, which discloses the preferred embodiment of the invention, and as pointed out in the claims hereunto appended.

In the accompanying drawing: 7

Figure 1 is a perspective view of a screw driver showing the attachment constructed in accordance with the invention and applied thereto.

Figure 2 is a vertical longitudinal sectional view through the attachment asapplied to the screw driver shank.

Figure 3 is an elevation of the attachment showing the same carried by the shank of the screw driver, the view being at a right angle to that in Figure 2.

Figure 4 is a view similar to Figure 3 but looking in a direction at a right angle thereto and the attachment being in an extended position on the screw driver shank.

Figure 5 is a view similar to Figure 4 but showing the attachment in a slightly retracted position gripping and holding a screw in operable engagement with the tip of the screw driver shank.

Figure 6 is a View similar to Figure 5 showing a further working adjustment of the attachment.

Figure 7 is a sectional View on the line 1-1 of Figure 2 looking in thedirection of the arrows.

Figure 8 is a perspective view of one of the members of the attachment.

Figure 9 is a perspective view of the runner or sleeve of the attachment.

' Figure 10 is a sectional view on the line Iii- 10 of Figure 4 looking in the direction of the arrows. y

Similar reference characters indicate corre-- sponding parts throughout the several views in the drawing. I

Referring to the-drawing in detail, A designates generally a screw driver of any conventional type having the usual shank Hi provided with the screw-engaging tip II and carrying a handle l2. The shank H1 in this instance is of substantially square formation and cross section throughout a major or greater portion of the length thereof.

Upon this screw driver is the screw holding attachment which comprises a runner or adjusting sleeve l3 slidably fitted to the shank IU of r the screw driver A. This sleeve is preferably made from a single sheet metal blank bent to embrace the shank [0 of the screw driver, it being of substantially rectangular shape in cross section throughout its length while at opposite sides of the shank ID of the screw driver within the said runner or sleeve I 3 are clearances for the arms M of gripping or holding jaws [5, these being inherently resilient. The arms M are provided with outwardly turned terminaltongues or ears l6 which are accommodated within receiving slots. I! cut into the runner or sleeve I3 at opposite sides thereof and opening outwardly therefrom. These tongues or cars l6 are held engaged in the slots 11 through the crowding dispositon of the shank [0 when the sleeve or runner I 3 is fitted thereon. The arms M are preferably bulged or. bowed outwardly as at I8 (see Figure 8) and when placed within the runner or'sleeve [3 these. portions l8 are tensioned for frictional action upon the shank ll! of the screw driver A which is inserted between them as shown in Figure 2 so as to hold the runner or sleeve in slidably adjusted position on the shank.

The holding jaws l5 are outstruck from the arms M as at l9 and are provided with inturned claw terminals 20 for cooperative gripping engagement with a screw 2| for the holding of the same in position to be acted upon by the tip ll of the shank H] of the screw driver in the working of the screw home in apiece of work or outwardly therefrom.

The holding jaws l5 are susceptible ,of embracing the screw 2! at various points of its length and particularly for hooking action with a head 22 of such screw for positively holding the latter in position to be worked upon through the engagement of the screw driver tip II in the; slot 23 provided in the head 22 of said screw. These jaws l5 of the attachment also will serve to grip and hold a fastener. devoid of the head but having a screw driver receiving slot for the engagement of the screw driver therewith.

The attachment positively holds the screws or studs either when inserting them in or removing them from a piece of work.

The arms l4 within the sleeve orrunner 13 will be positively interfitted therewithby the ears or tongues I6 engaged in the slots l1, this being effected by the presence of the shank l0 within the said sleeve or runner with the arms l4 disposed between the said shank and opposite side walls of the runner or sleeve, The runner or sleeve is frictionally held on the shank I0 and will remain in any desired location on manual adjustment thereof. I r

l The interfitting of the arms l4 within thesleeve or runner l3 avoids the necessity of rivets or other like fastenershin the assembly of the attachment and in the connection of the arms with said runner or sleeve.

The holding jaws I5 at the gripping termina thereof may be of a formation-to cooperate with a screw driver which in cross section -is round, oval or fiat faced and similarly the runner can be shaped in conformity with the screwdriver at the shank thereof.

--The jaws are outwardly offset with relation to the runner receiving the arms 14, these arms being outwardly bowed for the purposes herein.- before stated and the connecting portions l9 between the jaws proper and the arms being preferably oblique as shown. This outwardly ofisetting; of the jaws is for the purpose of removing the flexing point of the spring from the point thereof exactly where it emerges from the run.- ner to the interior of the latter and thus overcoming spring breakage at such point.

By reason of the formation and proportionate transverse dimension of the runner l3, which loosely embraces the screw driver shank In, there is provided suificient space for the arms M between the shankland the two'opposed walls of the runner to allow the flexing-action of these arms throughout the entire extent thereof with the result that the spring in these arms is transferred from the point where the same emerge from the runner. lflow due to the shape of the arms, that is to say, the bulges or bowed condition as at l8 wholly within the runner,there is not only obtained frictional'action on theshank,but, as stated above, the flexing action of these arms is transferred to a point inside of theru'nner. The arms id have a transverse line contact at their opposite ends with the shank of the/screw driver and a transverse line contact with the runner intermediate their ends and these arms are freely flexible throughout between their respective places of vcontact; with the screw driver shank and runner where they are movable with frictional resistance particularly when an outadjacent opposed sides of the shank, and a pair of cooperatively opposed resilient single-piece} jaw members projected forwardly from the forward end of said runner and having screw-retaining provision at their outer ends, said jaw members being formed with integral arm extensions of substantially the same length as the runner and offset inwardly therefrom at their inner ends and adjacent the forward end of the runner and extending respectively in the opposite longitudinal spaces between the screw driver shank and the adjacent opposed side portions of the runner, said arm extensions being fastened at their rear ends to the adjacent end portions of the runner and each arm extension being bowed outwardly with maximum original offset greater than the width of the space between the screw driver shank and the opposed sidewall of the runner, whereby, when assembled in the attachment, to be placed under tension by compressive distortion thereof, the extensions will have in the region of their opposite ends a transverse line contact with the screw driver shank and intermediate their ends a transverse line contact with the adjacent opposed side portions of the runner. r

2. An attachment for a screw driver having a conventional shank and screw-engaging tip portion, said attachment comprising an elongated open-ended runner freely embracing and slidable longitudinally on the screw driver shank, said runner having two parallel opposite longitudinal side portions spaced throughout the length thereof from the adjacent opposed sides of the shank, and'a pair of cooperatively opposed resilient jaw members each formed from a single fiat strip and having a portion projected forwardly from the forward end of said runner and having screwretaining provision at its outer end, said jaws having integral arm extensions of substantially the same length as the runner and inwardly offset therefrom at their inner ends and extending respectively with freedom of transverse movement in the opposite longitudinal spaces between the screw driver shank and the adjacent side'portions of the runner, said arm extensions being fastened at their rear ends to the adjacent'end portions of the runner and each arm extension being bowed outwardly substantially from end to end thereof with maximum original offset greater than the width of the space between the screw driver shank and the opposed runner wall, whereby, when assembled in the attachment, said arm extensions are placed under tension by compressive distortion thereof and have in the region of their opposite ends a transverse line contact with the screw driver shank and intermediate their ends a transverse line contact with the adjacent opposed side portions of the runner.

3. An attachment for a screw driver having a conventional shank and screw-engaging tip portion, said attachment comprising a runnerireeiy embracing and slidable longitudinally on tire screw driver shank, said runner comprising an elongated open-ended tubular member of rectangular cross section having two opposite longitudinal side wall portions spaced throughout the entire length thereof from the adjacent opposed sides of the shank, said side wall portions of the runner being apertured adjacent the rear ends thereof, and a pair of cooperatively opposed resilient jaw members each formed from a single flat strip and having a portion projected forwardly from the forward end of said tubular runner member and having screw-retaining provision at its outer end, said jaws each having an integral arm extension at its inner end of substantially the same length as the tubular runner member and offset inwardly from the jaw portion proper with an oblique connecting portion between the jaw portion proper and the arm extension, said arm extensions being each bowed outwardly from end to end thereof with maximum original oiTs-et greater than the width of I the space between the screw driver shank and the opposed runner wall and formed with an outwardly turned rear terminal tongue, whereby, with said arm extensions inserted in the respective opposite longitudinal spaces between the screw driver shank and the adjacent opposed Walls of the tubular runner member and the rear terminal tongues of said resilient arm extensions interfitted in the apertured rear end portions of the runner member, said arm extensions are placed under tension by compressive distortion thereof and held against longitudinal movement at their rear terminals and have a transverse line contact with the screw driver shank adjacent both their rear and forward terminals with their outwardly bowed portions intermediate the terminals thereof in transverse line contact with the adjacent opposed wall portions of the tubular runner member.

JOHN N. PETRE.