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Publication numberUS1755535 A
Publication typeGrant
Publication dateApr 22, 1930
Filing dateJul 5, 1927
Priority dateJul 5, 1927
Publication numberUS 1755535 A, US 1755535A, US-A-1755535, US1755535 A, US1755535A
InventorsBratrud Otto M
Original AssigneeBratrud Otto M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Adjustable cutting instrument
US 1755535 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

April 22,1930. 0. M. BRATRUD ADJUSTABLE CUTTING INSTRUMENT Filed July 5, 1927 INVENTOR 0H0 MflPaiPll Z ATTORNEY Patented Apr. 22, 1932 PATENT OFFICE OTTO BRATBUD, OF SEATTLE, WASHINGTON ADJUSTABLE cu'r'rme INSTRUMENT Application filed July 5, 1927. Serial No. 203,556

My invention relates to and has for a purpose the provision of a simple, practical, and durable instrument by which the manual manipulation of a blade in the cutting or 6 scraping of any article is greatly facilitated.

It is also a purpose of my invention to provide a cutting instrument in which the blade is provided with two cutting edges either of which may be presented for use and adjustable to expose more or less of'the cutting edge to suit the particular purpose for which it is being used.

I will describe only one form of adjustable cutting instrument embodying my invention, and will then point out the novel features thereof in the claims. 2

In the accompanying drawing:

Figure 1 is a view showing in side elevation one form of cutting instrument embodying my invention.

Figs. 2 and 8 are views in side elevation, and Fig. 4- a perspective view of the main parts of the instrument shown in Fig. 1 disconnected from each other.

prises a casing including a relatively long tubular section M, and a short section M, the two sections being detachably connected to each other by the provision of a tubular extension 15 011 the section M which is exteriorly threaded for engagement within a threaded portion 16 of the section M, all as clearly illustrated in Fig. 5. The section M is tubular in part to provide a chamber 18, the remainder of the section being solid with the exception of a slot 17 which communicates with the chamber to receive a blade B carried by a holder H and in such manner that Fig. 5 is a vertical sectional view taken one end of the blade can project from the free end of the casing section. This end of the section constitutes the working end of the casing and as shown in Figs. 1, 4 and 5 it is tapered in form to facilitate operation of the blade in cutting or scraping.

As shown in Fig. 7 the blade B has oblique end edges which are sharpened to provide cutting edges as indicated at 19 and 19 respectively. Between its ends the blade is provided with an opening 20 for receiving a pin 21 on the flat side 22 of a shank 23, the latter constituting part of the holder H. The holder also includes a head 24 on the upper end of the shank 23,and extending upwardly from such head is a sleeve 25' interiorly' threaded to receive the threaded portion-of a rod 26. The rod is provided with a cap 27 by which the rod can be rotated in one direction or the other to effect a longitudinal adjustment of the holder H as a unit within the casing to vary the projected position of the blade B. r i

As clearly shown in Fig. 5, the cap 27 is provided with a knurled portion 27 which is adapted to be gripped in eifectingrotation of the head. It is locked against displacement from the casing section M by the provision of an annular groove 28 therein in which is seated an annular bead 29 formed in the casing section by instriking the latter.

With the parts of the instrument assembled as illustrated in Figs. 1 and 5, the head 24 and the sleeve 25 are disposed within the section M, while the shank 28 projects into the chamber 18 to hold the blade B extended into the slot 17. It is important to note that the shank 23 is formed with an oblique shoulder 23 against which one cutting edge is adapted to bear in order that the blade may be properly positioned to'move longitudinally within the slot 17 By rotating the cap 27 the blade holder H is moved in one direction-or the other within the casing thereby effecting longitudinal adjustment of the blade B so that the cutting edge presented to the working end of the casing can be projected any desired distance within the range of adjustment of the holder. It will be understood that movement of the holder H in either'direction imparts a corresponding movement to the blade B through the operative connection provided between the two by the pin 21. This operative connection is maintained at all times by virtue of the longitudinal alignment of the flat side 22 of the shank in respect to the slot 17whereby the blade is at all times engaged by the pin.

By forming the blade B with the two cutting edges 19 and 19 and mounting the-blade on the holder H as described, it is possible to reverse the blade on the mounting to present either cutting edge to the working end of the casing so that when one cutting edge becomes dull the other can be employed. It is to be noted that the working end of the casing is likewise formed with an oblique edge so that the supporting surface provided thereby with respect to the blade may be parallel to the cutting edge thereby minimizing the possibility of breaking the blade during use, and particularly when scraping. By reason of the ready detachability of the casing sections from each other, the facility with which the blade B can be rversed or a new blade substituted will be apparent. The casing in practice will be of a diameter slightly exceel ing that of a pencil or pen so that it can be carried in thepecket, and to retain the instrument against accidental displacement from the pocket, a conventional'clip 30 is secured to the section M. 7

Although I have herein shown and described only one form of adjustable cutting instrument embodying my invention, it to be understood that various changes and modifications may be made herein without departingfrom the spirit of the invention and the spirit and scope of the appended claims.

I claim:

. 1. A cutting instrument comprisinga casing, a holder within the'casing, a blade carried by the holder and adapted to project from the casing, a threaded sleeve on the holder, a threaded rodengaging the sleeve, and means rotatable in the casing for actuating'therod to effect an adjustment oithe holder through the medium of said sleeve whereby an adjustment-of the blade is secured, the holder including a shank having a flat side against which said blade bears, and a pin projecting from the flat-side. of the shank and engaging the blade for sec-uring' the latter to the shank.

2. A cutting instrument comprising a casing, a holder within the casing, a blade carried'by the holder and adapted to project from the casing, a threaded sleeve on the holder, a threaded rod engaging the sleeve, and means rotatable in the casing for actuating the rod to effect an adjustment of the holder through the medium of said sleeve whereby an adjustment of the blade is secured, the blade having two cutting edges and being mounted on the holder to permit reversal thereof so that either cutting edge can be projected from the casing.

3. A cutting instrument comprising a casing, a holder in the casing, a blade carried by the holder and adapted to project from the casing, and means operable from apoint exteriorly of the casing for actuatin the holder to effect an adjustment of the blade whereby its cutting edge can be projected various distances-from the casing, the holder including a shankhaving a flat side against which said blade bears, and a pin projecting from the fiat side oft-he shank and engaging the blade for detachably securing the latter to the shank, the casing having an opening through which theblade projects, with the walls of the opening operating to definitely guide-theblade and-maintain it in engagement with the pin.

4. A cutting instrumentcomprising a casing composed of two sections detachably connected to each other, one of the sections having a tapered end provided With-a slot, a blade holder having a head disposed within the ether casing section and ashank projecting into the first casing section, said shank beingprovided with a flat side having a pin, a blade extending into the slot and engaging. the hat side of the shank, said blade having its opposite ends sharpened to provide cutting edges andanopening'therein for receiving said'pin, an interiorly threaded sleeve on the head, an exteriorly threaded rod engaging within the sleeve, a cap on the'rod for rotating thelatter, and means for rotatably securing the cap within the casing. A


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2483750 *Dec 22, 1945Oct 4, 1949Bratrud Otto MGlue spreader and paper cutter
US4320576 *May 2, 1980Mar 23, 1982Firma Martor-Argentax E. H. Beermann KgRazor knife with self-retracting blade
US4516575 *Jun 3, 1982May 14, 1985Coopervision, Inc.Surgical scalpel
US4790312 *Jan 20, 1987Dec 13, 1988Becton Dickinson Acutecare, Inc.Surgical knife
US20060185172 *Oct 20, 2005Aug 24, 2006Fiskars Brands, Inc.Utility knife
U.S. Classification30/320, 30/162
International ClassificationB26B27/00
Cooperative ClassificationB26B27/00
European ClassificationB26B27/00