US1327938A - Artificial arm - Google Patents

Description

E. R. BIRCHARD.

ARTIFICIALARM.

APPLICATION FILED JUNE 25. 1919.

Patented J ah. 13, 1920.

INVENTUR.

UNITED STATS PATENT orrron.

ESLIE R. BIRCI-IARD, OF TORONTO, ONTARIO, CANADA, ASSIGNOR TO THE DEPARTMENT OF SOLDIERS CIVIL RIB-ESTABLISHMENT, INVALIDED SOLDIERS COMMISSION OF THE DOMINION OF CANADA.

Application filed June 25,

- To all whom it may concern:

Be it known that I, Esmr. R. BIRCHARD, a subject of the King of Great Britain, residing in the city of Toronto, in the county of York, Province of Ontario, Canada, have invented certain new and useful Improvements in Artificial Arms, of which the following is a specification.

This invention relates to arms particularly intended for use in amputation cases where the forearm has been amputated a short distance below the elbow. In such cases when the elbow is closed, the short forearm practically disappears into the upper arm, thus making it impossible to provide an ordinary arm jointed in the usual way and operated by the stump. I overcome this difficulty by providing a joint by means of which the artlficial forearm moves through a longer are than the stump of the natural arm, so that the artificial forearm may be swung up to its limit of movement while the natural stump is still approxi mately at right angles to the upper arm.

The invention is illustrated in the accompanying drawings in which Figure l is a side elevation of my improved arm;

Fig. 2 a plan view of the same; and

Fig. 3 a side elevation of the joint with the parts in the positions they assume with the forearm swung up.

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

l is the artificial forearm, which may be of any construction, and 2 the sheath or jacket adapted to be secured to the wearers upper arm. 3 is the bucket for the stump of the forearm. Side irons 4 are secured to the artificial forearm, side irons 5 to the sheath 2, and side irons 6 to the bucket 3. These irons are all pivoted together at 7.

Pivot-ally connected to each side iron 6 is a link 8 which is connected with a stud 9 slidable in a slot 10 in the side iron 5. A link 11 is connected to the stud 9 and is pivotally connected with the side iron 4 closer to the pivot 7 than the pivot of the Specification of Letters Patent.

ARTIFICIAL ARM.

Patented Jan. 13, 1920.

1919. Serial No. 306,708.

' link 8. The result of this construction is that the artificial forearm is swung through a larger arc than that through which the bucket for the stump is moved, and the object of my invention is thus attained. The operating connections between the bucket and the forearm member are preferably duplicated at each side of the arm but of course one set only might be employed.

The side irons 6 of the bucket 3 are each preferably provided. with a lug 12, which by contact with the side irons of the forearm limit the extension of the forearm.

In practice many changes may be made in the details of construction without departing from the spirit of my invention.

What I claim as my invention is:

1. An artificial arm comprising a forearm member, an upper arm sheath and a bucket in which the operating connections between the bucket and the forearm member comprise a part mounted to slide longitudinally of the upper arm sheath; a link pivotally connected with the sliding part and with the buck t member; and a link pivotally connected with the sliding part and the forearm member, the distance between the pivot-point of the bucket link to the bucket and the pivot-point of the bucket to the upper arm sheath being greater than the distance between the pivotpoint of the forearm link to the forearm member and the pivot-point of the forearm to the sheath.

2. Anartificial arm comprisinga forearm member, an upper arm sheath and a bucket in which the forearm member, the upper arm sheath and the bucket are each provided with side irons at each side pivoted on a common pivot and provided with operating connections between the bucket and the forearm member comprising a part sliding in a slot formed longitudinally of one of the side irons of the sheath; a link pivotally connected at one end to the sliding part and at its other end to one of the side irons of the bucket; and a link pivotally connected at one end to the sliding part and at its other end to one of the side irons of the forearm member at a point closer to the common pivot of the side irons than the pivot point of the link of the bucket member from the said. common pivot.

3. In an artificial arm, the combination of a forearm member; an upper arm sheath;

a bucket for a forearm stump, the bucket and forearm member being pivotally connected with the sheath; and link connections 1,s27,93s v E. R. BIRCHARD.

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