US158801A

US158801A - Improvement in plates for guiding a hand-knife in cutting cloth

Info

Publication number: US158801A
Authority: US
Publication date: 1875-01-19
Anticipated expiration: 1892-01-19

Description

1. LACM ANN. r Plates for Guiding a Hand-Knife in Cutting Cloth, 810.

No. 58,801. v PatentedJan. 19,1875.

IKE GRkPH ISCQ PHOTO LITN.55& 4-! PARK PLACE. "3 1 UNITED STATES PATENT ()FFIGE.

JACOB LAOMANN, or PHILADELPHIA, PENNSYLVANiA.

IMPROVEMENT IN PLATES FOR GUIDING A HANDKNIFE IN CUTTING CLOTH, &c.

Specification forming part of Letters Patent No. 158,801, dated January 19, 1875; application filed October 16, 1874.

To all whom it may concern:

Be it known that I, JACOB LACMANN, of the city of Philadelphia, in the State of Pennsylvania, have invented an improvement in the metallic plates for guiding a hand-knife in cutting through layers of kid-skin, cloth, muslin, or other similar fabric, of which the following is a specification The object of my invention is to improve the metallic plates required to guide the handknife used in cutting through the series of layers of leather, cloth, muslin, or other fabric,

. required in the manufacture of gloves, shoes,

and wearing apparel generally, by constructing the said plates of steel, with finely roughened and hardened edges, whereby the said edges, while serving as grinding-surfaces, will keep the knife sharpened as it is passed along in close contact with said roughened edges.

' Figure l is a plan View of a metal plateguide, embodying my invention, used by me in the manufacture of the covering for the arms and hands of dolls. Figs. 2 and 3 are, respectively, two edge views of double and single beveled edges. Fig. 4. is-a side view of the knife-blade with the slightly concave and pointed cutting-edge found to be the best form as a grinding-edge against the passing knife;

but, when so made, the plate must be applied with the square edge next to the fabric to be operated upon. If it be desired to have the plate reversible-i. a, so as to be applied to the fabric by either side, as where both right and left forms of the fabric are required to be cut from the same face side th ereofabout onethird of the thickness of the plate (at the middle) is to be left at right angles to its plane, and the two outer thirds slightly beveled inward, as shown at a a, Fig. 3, the reefangular portion a, in either case, being the roughened one, against which the hand-knife is pressed in cutting. After the plate is formed, and the said portion roughened, it is to be hardened substantially in the same manner as files are hardened, and it is then ready for use. The curved or concave form of the pointed edge of the knife (see Fig. 4) is found by experience to be the best, and it will be seen that the grinding effect of the roughened part of the edges of the plate against the contact side of the sloping knife will be to keep that curved, and main cutting portionof the knife in a sharpened condition, thus saving the labor and time heretofore consumed by grinding on a stone.

The ordinary wooden patterns are soon cut and ruined by the knife, and the ordinary smooth-edged iron patterns wear away rapidly and dull the edge of the knife.

The advantages of my invention will be readily perceived without any further description or explanation.

I claim as my invention A pattern-plate for guiding a hand-knife in cutting out layers of leather, cloth, or other fabric, when the boundary edges of said plates are of steel roughened and hardened, substantially as and for the purposes set forth. JACOB LAOMANN. Witnesses:

BENJ. MORISON, WM. H. MORISON.