US1411651A - Trimming knife - Google Patents

Description

A. 0. WEISMANN. f 4

TRIMMING KNIFE.

APPLICATloN FILED SEPT. 2o. 1920.

Patented Apr. 4, 1922.

UNITED STATES PATENT OFFICE.

ARNOLD 0. WEISMANN, OF CHICAGO, ILLINOIS.

TRIMMING KNIFE.

Speeication of Letters Patent.

Patented Apr. 4., 1922.

Application filed September 20, 1920. Serial No. 411,536.

vices and is particularly adapted to utilize discarded safety razor blades and to provide a trimming knife in which the blades may be readily renewed or replaced.

The principal objects of my invention are to provide 'a handle to which the razor blades of a type similar to that used in the Gillette safe-ty razor may be attached to afford a substantial and convenient trimming knife; to attach the blade to the handle in such a manner that the removal and replacement of the blade may be readily and quickly accomplished ;to securely clamp the blade on to'the handle and brace same so that looseness or shifting of the blade is prevented; to provide a guard for the blade which reinforces the latter and prevents breakage owing to the thin character of the blade; and in general to provide an improved holder for safety razor blades, of simple form, inexpensive construction, and whereby such blades may be readily secured and held in the holder so as to provide a trimming knife which may be subjected to hard usage without danger of breaking thel blade.

On the drawings- Fig. 1 is a side view of a trimming knife formed of my improved holder with a razor blade attached;

Fig. 2 an edge view thereof; l

Fig. 8 a sectional view on the line 3 3 of Fig. 1; and

Fig. 4 an edge view of the clamping plates which I employ for attaching the razor blade to the handle.

Referring to the drawings the reference numeral 1 indicates a handle which is preferably of wood or similar material. suitably shaped so as to be conveniently grasped for trimming or cutting with the attached blade, and 2 is a tapered metal socket which is fitted on to the end of the handle 1 and secured thereto by the rivet 3. The end of the handle 1 within the socket 2 is slitted or divided as indicated at 4 and at the inner end of the slit is enlarged, as indicated at 5,

to form an arched seat at each side for a purpose which will appear hereinafter.

The outer end of the socket 2 is shaped to form an end opening 6 of narrow width which aligns with the slitv 1 in the handle 1l and at each side of the opening there is a lip 7 extending forwardly from the socket. These lips are of corresponding form and arranged in spaced parallel relation and each has a corresponding circularA notch 8 in the outer end.

This holder is designed particularly to be used with razor blades of the type used in the Gillette safety razor, such blades being extremely thin and double edged and provided with a perforation 9 near each end. Owing to the thinness of these blades it is impossible to use them in an ordinary blade holder for cutting purposes, as for example, as a shoe makers knife for cutting leather, rubber, etc., as the strain of a hard cut either bends the blade so that it will not cut on astraight line or breaks thefblade. To enable the blade to be Iused for work of this character and at the same time afford a simple and convenient means for attaching the blade to the handle, I employ a pair of clamping plates 10' and 11 each of which is similarly formed with a corresponding shank 12 for insertion through the opening 6 of the socket 2 and into the slit 1 of the handle, said plates 10 and 11 being of suitable width just beyond the opening G to cover the entire width of the razor blade 13 and being correspondingly cut away at opposite sides, as indicated at 11 and 15. so as to expose the forward portion of each edge of the blade. The portions 1-1- may be cut away for a somewhat longer distance along the edge of the blade and to a little greater depth than the cut away portions 15 to expose a greater portion of the blade for ordinary use, whereas the less amount of cutting away of the plates 10 and 11 at 15 reinforces the cutting edge to a greater extent and enables the portion of the blade exposed at this point to be used for harder service than the portion exposed at the point 14. However. at both sides the plates 1() and 11 are extended outwardly fairly close to the edge of the razor so as to reinforce the latter and prevent bending and breaking thereof. which would occur in cutting hard materials without such reinforcement. The plate 11 at a point distant froml the outer end corresponding approximately to the distance of the holes 9 in the razor blade from-the ends thereof has a circular stud 16 riveted, or otherwise secured, on the inner face and of suitable size to fit somewhat closely in either of the holes 9 of the razor blade 13, and the other plate 10 at a v corresponding point is provided with aperture 17 to receive the end of the stud 16 and thereby hold the plates 1() and 11 in alignment. The'plate 11 also has another stud 18 on the inner face spaced from the stud 16 a distance corresponding to the distance between the holes 9 in the razor blade 13, and the plate 10 has a corresponding aperture 19 to receive the stud 18. The stud 18 extends upwardly from the plate 11 so as to project through the opening 19 in the plate 10 when the razor lblade is clamped therebetween and at the outer side of the platev 11 is a corresponding stud 20, and these studs 18 and 20 when the lates 10 and 11 are inserted in the socket 2 t into the notches 8 of the lips 7 of the socket to steady or brace the clamping members 10 and 11 and prevent shifting thereof and consequent looseness of the blade 13 on the handle in the operation of cutting.

. The plates 10 and 11 are bowed outwardly intermediate of their ends, as shown in Fig. 4, so that when the Shanks 12 thereof are inserted in the socket 2 the exposed portions of said plates 10 and 11 and particularly the outer ends thereof will press firmly against the opposite sides of the blade 13. The

Shanks 14 of each of the plates 10 and 11 at their inner ends are oppositely arched at 21 so as to spring outwardly into the cavities 5 at opposite sides of the lower end of the split 4 when the Shanks 12 are fully inserted so as to hold the plates 10 and 11 securely in the fully inserted position in the socket 2.

It will be observed that the forward end of the socket 2 is rounded as at 22 and the opposite ends of the opening 6 are located a short distance back of' the rounded portions 22, thereby serving to stiffen the forwardly.

projecting lips 7 and afford a slight spring or give which insures the lips 7 being held firmly against the outer faces of the plates 10 and 11.

- In attaching a blade to this holder the plates 10 and 11 are merely withdrawn from the socket 2, a substantial pull being required owing to the engagementof the ex-.

panded ends 21 inthe slitted opening of the handlel, and then the razor blade 13 is placed between the plates 10 and 11 with the openings 9 of the blade fitted on the studs 16 and 18. The plate 10 is then pressed down against the top of the razor blade so that the openings 17 and 19 of the plate 10 engages the studs 16 and 18 respectively and the Shanks 4 of these plates inserted in the socket 2 until the studs 18 and 20 engage the notches 8 of the lips 7. When so engaged the expanded ends 21 of theshanks 4 engagein the enlarged lower end 5 oftheslit4 and hold the clamp plates 10 and 11 securely connected to the handle 1.

While I have shown and described my invention in a preferred form, I am aware that various changes and modifications may be made without departing from the principles of my invention, the scope of which is to be determined by the appended claims.

`I claim as my invention: f

1. In a knife, the combination of a handle having an elongated socket opening extending into the end thereof, a pair of clamping plates adapted to grip and hold a blade therebetween and provided with corresponding extensions adapted to be inserted in the socket opening of the handle, said extensions being provided with laterally expansible portions at their inner ends and- `the socket being provided with lateral seats at the inner end-adapted to be engaged by the expansive portions of the extensions for holding the extensions in the fully inserted position, and a ferrule on the handle having anu opening in alignment with the socket opening and engaging the outer faces of the clamping plates adjacent the inner end of the blade so as to press the plates against the blade.

2. In a knife, the combination of a handle having an elongated socket opening in one end, a pair of clamping plates having corresponding extensions adapted to be inserted in the socket opening so as to hold a blade therebetween, saidl clamping plates being reversely arched from end to end and engaged midway between the ends of the arched portions by the outer end of the socket so as to be fiattened against the blade and exert spring tension thereon when the extensions are inserted in the socket opening of the handle. y

3. In a knife, the combination of a handle having an elongated socket opening in one end, a ferrule on the end of a handle around the elongated opening and provided with an extension at each side of the opening, a pair of clamping plates adapted to hold a blade therebetween and having corresponding portions adapted to be inserted in the opening of a handle, said extensions being arranged to press the clamping plates together when the latter are attached to the handle.

4. In a knife, the combination of a handle having an elongated socket opening in one vend thereof, a pair of clamping plates adapthaving an elongated opening in the end, a pair of clamping plates having portions insertable in said opening for attaching the clamping plates to the handle and simultaneously-pressing the plates together so as to clamp a blade therebetween, interengaging means on the plates and the blade for holding the plates in the proper relative position and locking theblade therebetween, said means being arranged to projectat opposite sides of the clamping plates, an extension on the handle at each side of the opening therein having' notches in their forward ends engaged by the aforesaid projecting locking means of the clamping plates. l 6. ln a knife, the combination of a handle having an elongated opening in. the end thereof, a pair of clamping plates having corresponding portions insertable in said opening for attaching the -plates to the handle and pressing the plates together so as to clamp a blade therebetween, a -blade interposed between and interlocked ywith the clamping plates, said clamping plates being extended to the outer end ofthe blade and across the entire width of the inner end of the blade and being correspondingly cut awayalong the lateral edge from a point.

having corresponding extensions inserted ink the openingoil the handle, a blade inter` locked with and clamped between the eX- posed portions of the plates and having an edge thereof project-ing beyond the clamping plates, means projecting at opposite sides of the clamping plates intermediate of the ends of the exposed portions thereof, and a projection on the handle at each side of the openingtherein for holding the plates against the interposed blade and having portions at the outer end engaging the projecting means of the clamping plates for bracing same against movement relatively to the handle under cutting pressure.

, i ARNGLD O. WEISMANN.

Images