US1812462A - Twine cutter - Google Patents

Description

June so, 1931. R, BEAVER 1,812,462

TWINE CUTTER Filed Aug. 22, 1927 INVE RUDOLPH BEHvE/e zwamwi w- Patented June 30, 1931 UNITED STATES PATENT OFFICE I RUDOLPH BEAVER, OF WATER-TOWN, MASSACHUSETTS, ASSIGNOR TO GILLETTE SAFETY RAZOR COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF DELAWARE TWINE CUTTER Application filed August 22, 1927. Serial No. 214,651.

This invention relates to twine cutters having replaceable blades and adapted for use on store counters or similar places for the purpose of cutting the twine used in tying up bundles and for other purposes.

My invention contemplates the provision of a cutter of this character which is particularly effective in operation, a mere touch acting to sever the twine instantly. Its features of mechanical construction are also of importance. It comprises a number of assembled parts, each being simple and cheap to manufacture in itself and which may be assembled rigidly and compactly without the use of tools. The construction is such, moreover, that the cutter may be easily taken apart to permit replacing a used blade by a new sharp blade, while at the same time the parts are retained securely against accidental disengagement from their assembled condition.

These and other features of the invention will be best understood and appreciated I from the following description of a preferred embodiment thereof selected for purposes of illustration and-shown in the accompanying drawings, in which;

Fig. 1 is a plan view of the cutter,

Fig. 2 is a view in side elevation,

Figs. 3, 4, and 5 are views in perspective on a larger scale of the component parts of the cutter and v Fig. 6 is a sectional view on a still larger scale of the member shown in Fig. 4 taken on line 6-6-6.

The twine cutter herein shown comprises three separate parts, a back or blade holding member 1, a front or clamping plate member 2 and the blade 3. The blade holding member may be a sheet steel stamping and is substantially U-shaped, having a recess 7 with a straight bottom edge 8, and a curved top edge 9. This member is bent or flanged on a line 4 and the flange is provided with apertures 6 by which the cutter may be fastened to a counter, desk, leather band on the users wrist or other support by means of screws or rivets. The clamping plate or front member 2 may also be a steel sheet stamping and is provided with a recess 10 of the same size and shape as the recess 7' in the web of the holding member 2, so that when these parts are assembled in coextensive relation the recesses register with each other.

The blade 3 herein shown has a curved cutting edge 21, a straight back edge 20 and a locating aperture 11.

The parts of the cutter are held in assembled interlocked condition by two studs 13 and 14 which project from the blade holding member 1 and extend outwardly a distance slightly greater than the combined thickness of the clamping plate 2 and blade I 3. These studs are provided with enlarged heads 15 and 16. The clamping plate 2 is provided with a slot 17 extending inwardly from its rear edge and its upper arm 18 is provided with a keyhole slot 19, the circular portion of which is slightly larger than the head 15. The member 1 is also provided with a short pin 12 extending outwardly not more than the thickness of the blade 3.

In assembling the parts of the cutter the blade is placed in position on the pin 12 with 7 its back edge 20 resting on the flanged portion 5 of the blade holding member 1. The clamping plate 2 is then threaded over the stud 13 with its straight lower edge resting upon the upper face of the flange 5 and the slot 17 in line with the stud 14. If then the member 2 is moved to the right, as seen in the drawings, by pressure or tapping, the shanks of the studs will be received in the slots 17 and 19 with their enlarged heads engaging the surface of the clamping plate 2 and maintaining all the parts in rigid compact interlocking engagement.

In order to retain the parts of the cutter a ainst accidental displacement a portion 0 one of the members may be bent to form a resilient lock. As herein shown the left end of the upper arm 18 of the plate 2 is bent slightly outwardly from the plane of the plate. As will be seen, the bent plate must be slightly sprung in assembling the parts so that a resilient pressure will be exerted on the head of the studs.

An additional or alternative locking effect may be secured if necessary by tapering 10a a portion of the locking plate 2 adjacent to the slot 17 and making the stud 14 slightly shorter than the full thickness of the locking plate 2 and blade 3. Such a tapering portion is indicated in Figs. 4: and 6 by the reference character 22. It will be seen that this exerts a wedging action when the clamping plate is forced into its assembled position.

In order to facilitate disassembling the ill be carried forwardly and the studs disengaged from their respective slots.

As already noted the" cutting edge .21 of the blade 3 is curved and so locatedas to be exposed in the registering recesses 7 and 10 of the clamping members. The upper edge 9 of the recess 7 is also curved .on an are such that the opening between it and the cutting edge 21 of the blade tapers from the open end of'the recess inwardly toa point at which the edge 9 intersects the cutting edge 21. As herein shown'the taper ofthe opening progressively decreases from the mouth of the recess and this is accomplished by making the radius of curvature of the edge 9 of the recess 7 less than the radius of curvature .of the cutting edge 21. It is this feature of the construction which makes the cutter particularly efiective when the twine is introduced into the throat. V

- While I have described the twine cutter of my invention as adapted for general use, I am not aware that a twine cutter has ever been used on a wrist strap. This is a purpose for which the construction herein disclosed is particularly adapted. The back or blade holding member 1 is accordingly shown in Fig. 3 as riveted to abroad curved plate 23 by which it is maintained securely in upright position; The plate 28 .isrprovided with parallel slots fora wrist band each slot having teeth 24 at one edge adapted to enter the band and hold the cutter against transverse displacement.

Having now described the preferred em.- bodiment of my invention, I claim 1. A twine cutter comprising a fixed member, a movable member, an intermediate blade, said fixed member having means for attachment to a support, and stud'and-slot connections for retaining the members in assembled relation, a portion of one member being bent away from the'plane of the other member at a point adjacent to one, of the studs to provide for a resilient pressure against the head of that stud tending to prevent the parts from accidental disening va'headed stud adjacent to the loop of the U and another stud adjacent-"to one end 'of its arms, a slot extending inwardly from the end of the other member coacting with the first stud .anda keyhole slot with the other, and a blade adapted to be held between the members position to cut material which is passed transversely into theregistering recesses, the forward vend of the cutting edge of the blade being below the lower arms of the'U-shaped members, and the rearrend of the edge being above the upper arms at the inner end oft-he recesses. I Y

3. A twine cutter comprising co-extensive interlocking members, one having a flange at its base to support the cutter as a Wholeand.

the other having an edge shaped to engage said flange, .and a .replaceable blade adapted to be held between them in edge engagement with the flange, said interlocking members and blade being assembled in parallel relation, but one member being initially bent to provide a resilient .lock in the assembled cutter. V V

4:. A twine-cutter comprising amember having an angularly disposed base flange for supporting the cutter as a whole, a clamping member arranged to slide longitudinally of the .cutter in a path determined by its engagement with the base flange,and

clamping means associated with said mem-' bers arranged to engage when the clamping member is thus moved upon the base flange.

5. A twine cutter comprising a transversely forked blade-holding member having at its base an out-turnedfiange'for supporting said member in upright position, the flange having-a plane upper blade-positioning face, a blade provided with a fiat back and a curved sharpened edge arranged to project above the lower fork of the blade-holding member s when the back of the blade is supported by the face of .said flange, and a blade-clamping plate shaped forinterlocking engagement with the blade-holding member and edge engagement with said flange.

Signed at Boston, Massachusetts, this nineteenthday of August, 1927. i

RUDOLPH BEAVER.

gagement, the members being. so designed I

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