Untitled record

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AM. PHOTO-LITHO. CO. N.Y. (OSBORNE'S PROCESS.)

JOHN M. VAN OSDEL, OF CHICAGO, ILLINOIS.

SPRING-LANCET.

Specification of Letters Patent No. 2,061, dated April 24, 1841.

To dll whom- it may concern:

Be it known that I, John M. Van Osdel, of the city of Chicago, county of Cook, and State of Illinois, have invented a new and Improved Mode of Making Spring-Lancets; and I do hereby declare that the following is a full and exact description.

The nature of my invention consists in causing the blade of the lancet to react, so that it is brought instantaneously to its firstposition—that is to say, the blade is driven into, and out of the vein, by one motion of the spring, the click of the lancet is entirely subdued, by placing a piece of cork or leather for the bolt of the spring to strike against, after it has performed the required motion.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

I proceed to construct a case, or box of silver, brass, or other metal, of a convenient shape to contain the machinery of the lancet; T make the cases generally about two inches long, three fourths of an inch wide, and one-quarter of an inch thick; one end of the case is semi-circular, and the other end is square; one of the sides of the case is fitted in grooves so as to slide off, (similar to the common spring lancet case). A perspective view is shown of this case at A, of the accompanying drawing.

To construct the machinery—«, a, on Figures B and C represent the blade of the lancet, constructed in the ordinary manner; e. c, the thickness of the edge of the case.

d, d, d, is a pin of steel called the bolt.

/ / f is a round steel rod, firmly secured to the bolt by being screwed into it, or welded to it; on the end of the rod / is a small knob, (of similar metal to the case).

The bridle pieces e, e, e, e, are attached to the bolt cl, by the steel pivot at g ; the lower bridle piece is attached at h, to the blade a, by a steel screw—the upper bridle is pivoted to the edge of the case at k, by means of a steel screw; the construction of the bridle pieces are shown at E, on an enlarged scale where the same letters refer to the different pieces and pivots; as on the 50 Figs. Β. C, and D.

b, b, I), is a strong spiral spring of steel or brass wire which is retained in its place by the rod f passing through it; one end of the spring rests against the circular end 55 of the case, and the other end presses against the bolt d.

A lever is placed on the side of the case (similar to the common lancet). This lever is shown at j, on Figs. A and D. A small 60 steel cam is attached to this lever, which projects inside of the case, and retains the bolt d, as shown at I, I, on Figs. C, D.

It- will be observed that a small circular . projection is made on the edge of the case 65 as shown at k, k, k, this admits of the bridle pieces being made considerably longer, which is a great advantage.

Fig. Β represents the lancet after it is sprung; the bolt d, rests against- the cork 70 or leather piece at i; to set the lancet, take the- case in the left hand and then with the thumb and forefinger of the right hand, raise the knob on the rod /, and draw the rod outward until the cam I catches the end 75 of the bolt d, as shown on Fig. C, where the lance is set; then by pressing the thumb on the lever j, the cam I, is withdrawn, which liberates the bolt cl, which is instantly carried to the point i by the pressure of the 80 spring b, and the bridle pieces e, e, carry the lance down, and up, with great force, and a quick motion.