US1036379A

US1036379A - Screw-driver.

Info

Publication number: US1036379A
Application number: US69484112A
Authority: US
Inventors: Frank Arthur Tibbals
Original assignee: Individual
Current assignee: Individual
Priority date: 1912-05-03
Filing date: 1912-05-03
Publication date: 1912-08-20
Anticipated expiration: 1929-08-20

Description

' and, by pressing thereon,

SCREW-DRIVER.

1 11/ 155'wkom iz may concern:

Me it known that 1, F ANK ARTHUR Tissans. a citizen of the United States, and a resident of Monmouth. in the county of.

\Yarren and State of 'lllino's, have invented an Improvement in Screwrivers, of which the following is a specification.

My invention is an improvement in that class of ratchet screwdrivers which" are provided with a leverattachment adapting them for very heavy work and for use in angles or places where it is difficult to operate an ordinary screwdriver.

The invention is embodied in the improved construction, arrangement, and combination of parts hereinafter described, and illustrated in the accompanying drawing, in which Figure 1 is a longitudinal section of my impro-ged screwdriver, showing the blade locked with the handle, so that it may be used like an ordinary screwdriver. Fig. 2 ,is a longitudinal section showing the lever in working position and the clutch mechanism disengaged. Fig. 3 is a longitudinal section'of the metal ferrule connecting'the handle proper with the blade. Fig. 4 is a cross section on the line a e-4c of Fig. 1. Fig.

' 5 is a cross section on the line 5-5 of Fig. 2.

Fig. 6 is a cross section on the line- 6-'6 of Fig. 1.

trating the clutch mechanism.

Referring in the first instance to Fig. 1, 1nd1cates an enlarged wooden the numeral 1 handle, 2, an iron or-other metal ferrule which is rigidly connected therewith, and 3, the blade, or screwdriver proper. A cam lever 4 is pivoted at in the ferrule 2 and its shank or handle portion is adapted to close into a longitudinal recess or groove 1 in" the handle, as shown in Figs. 1 and 4; and it is locked detachably in saidgroove by means of a spring catch 6.'see Fig. 4:. The catch consists of a pin adapted to slide in the transverse bore of the handle against the tension of a spiral spring 7 and is provided with a lateral claw 8 which isadapted to take into a groove or recess formed in the lever 4. 1

.The outer end of the catch is accessible, the claw 8 may be disengaged from the lever, so that the latter-will be left free, tobe turned down out of the groove 1*. l The ferrule 2 is provided in one side with a longitudinal slot 2 which registers with the groove 1 of the Specification of Letters Patent. P gmented Application fiiea ra 3, 1912. Serial No. 694,841. 7

. ceive the pivot-pin 5, and the extreme Fig. 7 1s a perspective view illus ILLINOIS.

"".'":-E: handle, this being obviously necessar. enable the lever to be moved from thei'ver, tical'to the horizon'talposit-ion indicated i Fig. 2, and vice versa.- 3.

The inner or lower 'endof the lever. provided with an inclined slot 4 to" 1'6 -end of the lever is constructedto act .asthe cam proper, the clutch as shown in Fig. 1. I This clutch 9 is provided, as shown in Fig. 7, W1th lateral lugs or projections 9 that are adapted to fit and slide in corresponding longitudinal gro'ove's 10see Figs. 1,3 and 6'-which are same pressing upon'a movable,

formed in the middle portion-0f the fer.-

rule 2. The clutch 11 formed on the slightly enlarged head of the blade 3 is adapted to .receive and engage with corresponding projections on the slidable clutch 9, and the latter is held normally separated-from the clutch 11 by means of a spiral spring 12.

It will now be understood that when the l ver is raised and locked in the groove of the handle, as shown in Fig. 1, which is'its normal position, its cam end pressing upon.

the 1novable-clutch 9 forces it down into engagement with the clutch 11 on the blade 3, andthus the latter is locked with the ferrule and may be rotated with the handle the same as in the case of an ordinary screwdriver; but when it is desirable to use the lever forturning the screwdriver, it is released from the catch 6 and thrown down to the horizontal posit-ion shown in Fig. 2. In such case, the diagonal arrangement of the slot 4 permits the'cam to slideju p ward, so to speak, far enough to allow the-spring12 to force the movable clutch 9 upward-out of engagement with the blade clutch 11., Then, before pulling on the lever to turn the screwdriver,.pressure is applied to the handle 1. sufficient to compress the spring 12 and bring the clutches again i-IltO engagement. In such case, it. is obvious that the ferrule will slide down on the-blade shank far enough, as indicated by dotted lines in Fig.

2, to permit the clutches to engage. 'The pull on the lever is given when)" such engagement has been effected, and consequently the blade is rotated a di tance corresponding to the lateral horizo tal swing of the lever. Thendownward pressure on the handle 1- being relieved, the clutches again disengage, so that the lever may be turned back to its original horizontal position, whereupon pressure being again applied downward to the handle, the clutches are again forced into contact and pull on the lever being given, the blade is rotated as before. Thus by alternate downward pressure upon the handle andpull on the lever laterally, the blade is rotated with powerful effect.

What I claim is:

l. The combination of a handle, ferrule,

and blade, the latter being provided with a half clutch, a corresponding hal 'l. clutch which is slidable in the ferrule toward and from the blade and looked rotatably with the ferrule, a spring which normally holds the clutches separated, and a cam lever pivoted in the ferrule and adapted, when in normal closed position, to hold the clutches engaged, substantially as described.

2. The combination of a handle, ferrule, and blade, the latter being provided with a half clutch, a corresponding half clutch which is slidable in the ferrule toward and from the blade and locked rotatably with the-ferrule, a spring which normally holds the clutches separated, and a cam lever havoaaare ing a diagonal slot in its working end, a

pivot pin passing transversely through it,

and the ferrule, the cam portion being thus adapted, when the lever is in normal closed position, to press upon the movable clutch and hold it engaged with the blade and when the lever is thrown down to horizontalposition, the cam relieves pressure on the normally separated, and a cam lever pivoted in the ferrule and adapted, when in horizontal position, to relieve pressure on the movable clutch, as described.

FRANK ARTHUR TIBBALS. Witnesses:

D. W. HARE, J. A. SIEGIRIED.