US1687788A

US1687788A - Screw driver

Info

Publication number: US1687788A
Application number: US66656A
Authority: US
Inventors: Abraham S Pinkus
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-11-03
Filing date: 1925-11-03
Publication date: 1928-10-16
Anticipated expiration: 1945-10-16

Description

mam El KV mm P m sum .m A l Oct. 16, 1928.

I INVENTOR.

5 v ATTORNEY,

Patented Get. 16, 1 92 8.

ABRAHAM s. PINKUS, on NEW YORK, N. 'Y,

' scanw DRIVER.

Application filed November 3, 1925. Serial No. 66,656.

' This invention relates-to screwdrivers and more particularly to screwdrivers of the clutch type in which a clutch is provided ior holding the screw while it is screwed nto place, or for holding the screw asit is withdrawn. An object of the invention is the provision oi a clutch for the screw head which may be engaged or released by the action of the fingers of the hand which operates the device, another object is to secure the automatic release of the screw from the clutch and another object is to provide means for operating the clutch by the movement of the outer sleeve relative to the handle. Other objects of the invention will appear from the following specification and the accompanying drawings, in which, Fig. l, is a screwdriver V embodying my invention, Fig. 2 corresponds to Fig. 1, with the handle shown 1n section,

Fig. 3 is an-enlarged view of the interior with'certain parts shown in section, Fig. 4 is a cross-section of the handle on the line 1212 of Fig. 3, and Fig. 5 is a cross-section.

of the shank on the line 1313 of Fig. 2. j

The present invention comprises a screwdriver bit with a plurality of clutch springs extending lon itudinally therewith and enclosed in a tubular sleeve. The bitIis movable longitudinally relative to the handle but is. secured to rotate with. the handle. clutch springs do not move longitudinally relative to the handle, but the outer sleeve is movable longitudinally relative to the handle and this sleeve may rotate independ ently of the other parts; The relative longitudinal motion between the sleeve and the clutch sprin s operates the clutch and, as the sleeve is moved by a'finger grip, it is apparent that the clutch is manipulated from the handle. The longitudinal motion of the'bit Is opposed by a spring and so arranged that when the clutch is released,the bit automat1- cally discharges the screw. The fiat end en- EZZL iH the screw is u 3-set fromthe lon itudit) O 23 nal shank which engagesthe handle, this end has a shoulder which, normally is engaged by the clutch members and whenin thisposition the device is used as an ordinary screw driver. g

The preferred form of my invention is shown in the drawings in which the shank is indicated by 51, the handle by 52, the fer- The rule by 53 and the finger grip by'the disc 54.

longitudinal centre of the handle. The stem' of the bit 61 is made from round stock and at the inner end is fitted with a square sleeve62 which is secured thereto by the'pin 63. This .sleeve' slides in the central aperture in 64 and r is projected b the spring 65. Thusth'e bit has a longitu inal movement relative to the handle while it is rotated by the handle and has a normally projected position.

The sleeve 51 has a flange 7 3 at the inner end which engages the spring 72 in the hol low handle. This sleeve can thus be moved relative to the handle to release the jaws 56 of the clutch as indicated in Fig. 2 while the spring 72 tendsto move the sleeve to the position which holds the clutch jaws closed.

The clutch jaws are formed from

springs

66, 67, 68 and 69 which are formed in the'arc of a circle as indicated in the cross-section. in I Fig. 5 so as to align with: the tubular form of the instrument. The inner ends of these springs are turned over as indicated'at 71, Fig. 3 to engage the washer 70 which is engaged by the spring 72. I e

Inassembling it will be noted that the clutch springs are inserted in sleeve 51 from the outer end, spring 72 and washer 70 are then placed, the stem 61 of the bit is'inserted from the. outer end andthe square block 62 is riveted to this end when it is in place. This block prevents the washer 70 and the

springs

66,67, 68'and 69 from being displaced at the inner end'and the entire device is thus ready to insert inthe handle where it is held by the ferrule 53. engaging the flange 73.

In this construction it should be noted that the sleeve 51 is free to rotate as well' as to slide in the handle. This sleeve may, thus, be firmly held while the device is put to its intended use. Where desired the

springs

66, 67, 68 and 69 may be made of a tube slit at the end to form jaws.

Having thus. described my invention, I claim:

In a screwdriver of the class described, the

combination, ahandle, a tnbnlar sleeve having one end slidably inserted in said handle, a

shank formed in a bit at one end and spring fingers having inturned ends aoent said bit slidably inserted with said [shank in said sleeve, said spring lingers forming jaws'con trolled by said sleeve for holding a screw in alignment With said bit, a ferrule on said handle resisting the outward inovenient'o f weaves secured to the end of said shankniaking non-turning engagement with said handle whereby said bit is operated by the handle.

Signed at New York in the county of New York and State of New York this 27th day of October, A. D1925.

ABRAHAM S. PINKUS.