Curve cutter

Application filed October 29, 1928. Serial No. 315,670.

This invention relates to cutting devices, and more particularly to a device for cutting curves of various sorts, particularly compound and irregular curves.

It is possible, by mounting a cutting blade for free turning movement and disposing it to engage the work at a point eccentric to the axis on which the blade turns, to cut curves of various characters. During the cutting 10 operation, the blade, due to its eccentric mounting, trails the supporting member or handle in which such blade is mounted so that the blade may be moved with facility along a line defining a pattern which it is desired 15 to cut. I have found, however, that it is important, to assure accuracy and ease in the cutting operation, to support the blade in such manner that it will be disposed perpendicular to the work at all times during the cut25 ting operation.

By thus supporting the blade, itwillreadily turn or swivel so as to· follow with ease the curves of intricate patterns and will cut the material or work much more readily than if ²⁵ the blade were not thus held.

One of . the main objects of my invention is to provide a cutting device of the character stated, of simple construction and operation in which the blade is held perpendicular to 20 the work and is supported in such manner as to be readily movable thereover in all directions. A further object is to provide means whereby the blade can be readily adjusted so as to vary its angular relation to· the work ³⁵ and can be renewed when desired at small cost. Further objects and advantages will appear from the detailed description.

In the drawing:

Fig. 1 is a perspective view illustrating the manner of using a cutting device constructed in accordance with my invention;

Fig. 2 is a sectional view through the handle, the blade and the holder therefor being 45 shown in elevation ;

Fig. 3 is a section taken substantially on line 3—3 of Fig. 1.;

. Fig. 4 is a section taken substantially on line 4- 1 of Fig. 2.

I have illustrated my invention, in Fig. 1, as used for cutting various designs in a sheet 1 of paper or other material.

Preferably this sheet is supported upon a glass plate 2 which rests upon a table 3. The provision of the glass plate 2 is not essential 55 but I prefer to utilize this plate as it prevents injury to the cutting edge of the blade such as would be apt to occur if the sheet 1 were supported upon wood or other material of like character into which the blade would eo enter after cutting through the sheet.

The cutting device comprises a hand piece or handle 4.bored out from its lower end for reception of a neck 5 which extends upwardly from a head 6, this head being slotted or 65 bifurcated. The head and the neck constitute a holder for the cutting blade. The upper end of neck 5 is rounded as at 5^a and abuts the inner end of the bore which receives this neck, the inner end of this bore being preferably 70 normal to the axis thereof, as illustrated. The neck δ is provided with a circumferential groove 7 which receives the inner end of a retaining screw 8 threaded through handle 4. The blade holder is thus mounted in handle ⁷⁵4 in such manner as to have free turning movement on the axis of the handle.

A blade 9 is adjustably and removably secured in head 6 by means of a linger 10 inserted through the slot of this head, and a so securing screw 11 threaded into the head transversely of the slot. The blade 9 includes the body 12 of rhomboidal shape, finger 10 projecting from the upper inner corner of this body. 85 . The lower edge 13 of the body is the cutting edge and is inclined downwardly away from the holder, terminating in point 14. This point is disposed eccentric to the holder and is intended and adapted to penetrate the ⁹⁰work and to provide a point of contact upon which the blade will readily turn or swivel to accommodate changes in direction thereof along the pattern being cut. The downward and outward inclination of the cutting edge ⁹⁸13 relative to the holder is of advantage as producing a draw cut so that relatively thick material can be cut with but little effort. By loosening the screw 11 the angular relation of the blade to the work can be varied so as ¹⁰⁰ '2

1,775,813 the arms 17 and 25 is sufficient to perinit cutting of any figure of any size such as would ordinarily be produced by a device of this character. . :

Preferably, I provide a sleeve 28 of rubber or other suitable material, about the lower portion of handle 1 to facilitate firm holding of the tool ’during use thereof. This sleeve has been omitted in Fig. 2 for the sake of clearness. . In using the device handle 4 is ₇₅grasped as iri Fig. 1, so as to be held firmly, to increase or decrease the draw cut. effect of the cutting edge 13 in accordance with the material being operated upon. .

To assure ease and accuracy, in cutting the material, the cutter, comprising the holder and the blade, should be held perpendicular to the ’work at all times so that-the point.14 will serve as the point upon which the blade turns and the cutting edge 13 will be· maintained in the proper angular relation to -the work to assure greatest ease in. cutting of _e—---------- <= · . . .

the material. Tn effect this result, I have· andas then moved over the work m such manprovided means whereby the blade and the ner as to cause the cutting edge of blad? 9 holder, constituting the cutter, are held per-, to fohow accurately the outline of the design pendicular to the work at all times and. are or pattern being cut, as.indicated. Due to the _ 'supported in such’ manner as to be readily fact that the handle 4 is maintained perpenmovable thereover: in all directions. .., dicular to the work at all times, ease, and ' A supporting 'and''securingmember in the 'accuracy-in tracing-and cutting the patter 'foriri bf a screw clamp.15 of known type is , secured to the edge' of table 3. I have found a Screw clamp convenient as providing means ‘ whereby my device Can be readily attached 'to a table Of' conventional construction, but it will be understood that any other suitable 3‘ or converiient 'device for attaching the supporting means t o a table or like structure, can ’ be employed. The’member 15. is provided with a stud 16 projecting, vertically from the top thereof. This stud is disposed perpenj) 'dicular to the upper face of table 3 and, consequently, to the Work 1, /

An arm 17 is provided,at. its ends, with sle'eves 18 and 19 which are 1’ _x \ . -arid 'extend transversely of the arm, Qg ______ ., '' turning movement thereon and seats upori a ‘ ’ ddllar 20 at'the lower efid of this stud. Sleeve

22, which is transversely slotted from its upor pattern being cut, as indicated. Due to the ₈θ dicular to the work at all times, base and is obtained.

The blade-itself can be readily produced at- _8gsmall cost and can be replaced as necessary or desired.