US1301367A

US1301367A - Artificial hand.

Info

Publication number: US1301367A
Application number: US27906919A
Authority: US
Inventors: Bartholomew Bowler
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-02-25
Filing date: 1919-02-25
Publication date: 1919-04-22
Anticipated expiration: 1936-04-22

Description

B. BOWLER.

ARTIFICIAL HAND.

APPLICATION man Fsmzs, Isle. 4

Patented Apr. 22,1919.

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ARTIFICIAL HAND.

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To all whom t may concern.'

Be it known that I, BAR'rI-IoLoMEw Bow- LER, of the city of Toronto, in the county of York, Province of Ontario, Canada, a subject of the King of Great Britain, have invented certain new and useful Improvements in Articial Hands, of which the following is a specification.

This invention relates to the hand shown and described in my prior United States application No. 277,818, dated February 18, 1919, and my object is to improve the constructions employed for rotarily adjusting the hand on the arm member and for adjusting the hand to one side or the other of thev axis of the arm member. It is more particularly my object to so design these parts that they are more easily and cheaply made while possessing equal or greater eiciency than the parts they replace.`

I attain my object by means of the constructions hereinafter described and illustrated in the accompanying drawings in which Y lFigure 1 is an elevation of my improved hand connected to an artiiicial arm member;

Fig. 2 a similar view, partly in section, taken at right angles to Fig. 1;

' Fig. 3 a longitudinal section of the connection between the hand member and the arm member;

Fig. 4 a plan view of the end plate and adjusting plate of the arm member;

Fig. 5 a partial longitudinal section on an enlarged scale of the connection between the hand and arm members; and

Fig. 6 a view similar to Fig. 5 showing a slight modification.

In the drawings like numerals of reference indicate corresponding parts in the different figures.

1 is an artificial arm member of ordinary construction adapted to be laced to a stump. The end of the arm member is formed a flat metal plate 2, to which the hand member is connected. The hand member is provided for the purpose with a boss 3 having a threaded hole formed therein adapted to screw on to the threaded upper end of the pin 4. This pin 4 has a head 5 formed at its lower end and is rotatable in the end plate 2. On the end plate is superimposed an ad- 'usting plate6, which has a fiat sided hole formed therein (see Fig. 4) which engages a correspondingly shaped part 8 of the pin 4. The adjusting plate will thus serve to Specification of Letters Patent.

Patented Apr. 22, 1919.

Application filed February 25, 1919. Serial No. 279 .069.

rotatethe pin 4 in the plate 2, while the plate 2 is itself free to slide suiiiciently longitudinally of the ypin to permit the boss 3 to be screwed down tight on the end of the pin to jam the adjusting plate and the end plate together. The threaded end of the pin 4 is somewhat larger than the remainder of the pin so that the pin remains in position in the

plates

2 and 6 when the boss is unscrewed. l

The purpose of this construction is to enable the hand member to be rotarily adjusted on thearm member. It ywill be observed that when theboss 3 is clamped in place, it always assumes a certain position relative to the plate 6, so that by turning the plate 6 (when the parts are loose) to any desired position, the position of the hand member will also be found to be changed when it is screwedtightly in position.

I find it preferable to provide frictional means tending to resist the turning of the adjusting plate 6 on the end plate 2. For this purpose I may provide what is commonly called click mechanism, as shown in -Fig 5, or plates 9 of fiber or other frietional material as shown in Fig. 6.

In Figs. 3, 4 and 5 I show a spring actuated ball 10 supported by a holder 11 to operate through an opening in the end plate 2. A plurality of small holes 12 are formed in the adjusting plate 6 concentric with the pin 4 and in position to consecutively engage the ball 10. The ball, when engaging r a hole, yieldingly resists movement of the adjusting plate. while the sound of the click indicates to the user when the plate has been adjusted through an angle corresponding to one or more holes. the adjusting plate to facilitate its rotary adjustment.

The boss 3 is provided with the jaws 14, between which is pivoted the shank 15 of the hook 16. The hook is thus adapted to swing on an axis at right angles to an aXis longitudinal of the arm on which the boss 3 turns. It will be noted that the axis on which the shank is pivoted lies substantially in the same plane as the hook. The pivot pin on the shank passes through both jaws 14 and the shank and is suitably set up with a nut.

To adjust the angle of the hook as indicated particularly in Fig. 2, I provide a latch 18 pivoted. in a slot formed in the shank 15 and adapted to engage any one of the notches 19 of a quadrant formed on one A lug 13 is provided on of the jaws 14. A, spring 2O engagingthe latch and the shank provides means tending to hold the latch in engagement with the notches.

The hook is constructed substantially as in the prior patenthereinbefore referred to. The hook is double and the parts of each half remote from the shank are substantial-ly arcshaped as shown. The center from which the arc is struck vis located in the shank, preferably near the outer end thereof.

Between the halves of the hook is :pivoted a clamp arm 21, `which is `preferably formed of resilient metal and is curved in thedirection of its length as shown. To adjustably connect the clamp arm to the arc-shaped parts of the hook, I Lprovide a dog 522 4pivoted on the clamp armand normally pressed by a spring 23 to engage the teeth of a-rack 24, preferably a ratchet rack, formediinfth'e outer side offthe arc-shaped partiofeach half of the hook. rThe arm is thus easily vswung to press against the outer side of anyf'object.

with which the `hook unay be engaged Vand releasably held as moved.

What I claim as my invention is:

l. The combination of a hand provided with a boss for attachment to anarticial arm member; jaws `formed onlsaid boss; a hook member having a shank -iitted between said jaws; a ypivot pin passing through said jaws and shank, theshank above the pivot pia beingaiviaed of snaai; a mail 'pivoted in the shank, a notched quadrant being formedl on one of `the jaws with which said latch is ,adapted to engage; and a spring en- Y plate superimposed A'on theend plate, `Said adjusting pl-ate being looseon but having-ia rotative fengagement with the pin.; :and fa hand fmember provided v.with 1.a boss 'adapted to screw fon theapin 4and jam the adjusting plate and end plate together. v

Am artificial arm ymember providedat its lend .with-,a flat plate.; a central lipin rotatably connedtetl with said `plate and provided with a threaded (outer, end; an adjusting platesuperimposed'on theend iplatesaidadjusting :plate :being loosefon but lhaving `v`a irotativeengafgement with the pin; iazcliclndevice -yieldingly retainingthe adjusting plate l in any predetermined position to which vit fis turned andra hand :member :provided with 3a boss Iadapted to screw lon the pin-and jam the adjustingplate andend plate together. Signed at the city of Toronto this rl9th day of Feb., 1919. 4 I j BARTLHQLOMENV BQNVL'ER.

Copies of `this patentrmay be'obtalned. -for :,ve cents each, `by.adressingthe Commissioner of Pateta i i yWashington,1h01