US2596851A - Cutter blade - Google Patents

Description

May 13, 1952 J. HANSEN CUTTER BLADE Filed Feb. 27. 195o i IVENTOR. /Uhn NEIL Patented May 13, 1952 UNITED STATES PATENT OFFICE CUTTER BLADE.

John Hansen, Bettendorf, Iowa Application February 27, 1950, Serial No. 146,497

often occurring that the bread is crushed andv the cuts or slices are not clean.

VIn my U. S. Patent 2,002,812 I disclose amethod of making a cutter blade of. the type referred to above. The design of blade of that patent .is the basic design used in conventional .breadslicing machines. It has many advantages-.and functional characteristics that have established the superiority of that particular type. Nevertheless, it has been determined that that type of blade is susceptible to improvement to the endA that a keener cutting edge may be provided to eliminate crushing of the bread. For that purpose, the blades of the present invention have been developed, the principal feature of which is a thinner cutting section 4provided by opposite beveled faces, preferably hollow ground, which may be scalloped either along the lines of the conventional blade referred to above of-provided with an improved scallop in which *the profile is in the form of a hooked curve; that is, more in the nature of a parabola than a true arc. It is a further object of the' invention to provide an improved cutter blade that may .be readily and inexpensively produced, bearing in mind that blades of this type are commonly provided by .simple grinding operations, for which 1 purpose many of the beveled faces on the. present -blade are produced as sections of cylinders or cones. Primarily, it is a feature yof the invention to materially reduce the thickness of the vcutting section at the points or peaks of the scallops. and likewise to provide contiguous sharpened profiles on the valleys between the vpeaks oripoints.

The foregoing and other important objects Claims. (Cl. .14S-129.)

Figures 2 and 3 are respectively transverse sectional-views taken on the lines 2-2 and 3 3 of Figure 1.

Figurefi is a view along the line 4--4 of Figure 1.

Figure 5 is an enlarged fragmentary transverse sectional view taken through the blade and showing the structurethereof at a stage prior to its completion, the View being approximately four times that of Figure 3 and representing a section in the same plane as Figure 3.

Figures is anv enlarged sectional view duplicating the cutting section of Figure 3 but drawn to the'same scale as Figure 5.

Figure '1 is a side elevational view of a modified form of blade in which the scalloped cutting edge includes valleys, the proles of' which are in the form of parabolic or hooked curves.

- The blade constructed according to the embodiment of Figures 1 to 6 comprises a bodyV 20 `having a base section 22 and a cutting section 24. The base section includes a back edge 26 andapair of opposite parallel sides 28 and 30 which extend perpendicular to the back edge anddesirable features inherentin and enoompassed by the present invention will become Vapparent as two preferred embodiments thereof are `-andcmbodying the principles .of .the invention, the -view being Yaigiproximately three times the actual size vof the blade.

toward a cutting edge provided at 32 on the cutting section 24, this cutting edge being scalloped to provide a series of alternate peaks 34 and valleys 36. The parallel sides 28 and 30 extend from the back edge 26 for a distance approximately two-thirds ofthe total distancebetween the'backedge 26'and cutting edge 32. The parallel sides thus terminate in a zone defined by Ya yline 38 intermediate the edge 26 and the straight linealong which the peaks 34 are alined. As seenin Yhigure4, the peaks 34 lie along a line inthelmedian planebetween the sides 28v and "30; although, this line could 'bein any parallel `the back 'edge 26 and the line'along which lies formed on ythefradius.lof such abrasive wheel.

These-'beveled faces converge froml the jsides 28 and 30 to and meet at the line of peaks 34, thus providing each peak with a keen sharp cutting point 44.

The scallops may be provided by grinding according to the method of my patent identified above; or the beveled faces 4!) and 42 may be provided in a preliminary operation. Because of the grinding of the beveled faces 40 and 42, these faces will be preliminarily intercepted by each scallop generally along a line B-B as shown in Figure 5. Therefore, the cutting section is additionally ground or otherwise provided with a secondary beveled face 46 which adjoins "or merges with the primary beveled face 42 and which converges toward and sharply meets the opposite beveled face 40 to provide a keen sharp cutting edge portion 48 on the prole of each valley. In other words, the secondary bevel at 46, if considered as a straight rather than a hollow ground bevel, forms an acute angle with the primary beveled face 40 (at 48) and an obtuse angle with the beveled face 42, just short of the line 38 along which the beveled face 42 and side 3B meet. As shown in Figure 1, the curvature of the bevel 46 is eccentric or non-parallel to the curvature of the valley profile 3S, being formed on a radius as at C.

The modified form of blade shown in Figure 7 is very similar to that just described, except that the scalloped cutting section 24a thereof is provided with alternate peaks 34a and valleys 36a, the pronle of each valley being in the form of a hooked or parabolic curve, or otherwise in such form that the profile includes a relatively long portion 36h and a relatively short curved portion 36e, the former being formed on an arc having a relatively long radius and the latter including an arc of relatively short radius. For the purpose vof orienting the structure of Figure 7 with that of Figures 1 to 6, the reference characters used in Figure 7 will be the same as those previously used, except that they will carry the exponent a. Additionally, transverse sections respectively on the lines X-X and Y-Yof Figure 4 will have the appearance of the sections shown in Figures 2 and 3.

In both forms of the invention it is characteristic that the cutting section 24 (24a) is relatively thin in cross section, particularly at the peaks 34 (34a). Further, because of the secondary beveled face at 46 (46a) the curved or prole cutting edge portions 48 (48a) are relatively thin and considerably sharper and therefore present less resistance to passage through the material being cut than blades of prior construction.

It will be seen from the foregoing description that the advantages and features of the invention are effectively achieved by either form of the invention disclosed. Features and advantages other than those specifically enumerated herein will undoubtedly occur to thoseversed in the art, as likewise will numerous modifications and alterations of the preferred embodiments of the invention, all vof which may be made without departing from the spirit and scope of the invention as defined' in the appended claims.

What is claimed is:

1. A cutting blade, comprising: an elongated, relatively thin body having a back edge, a cutting edge, and opposite, generally parallel sides; said cutting edge being scalloped lengthwise thereof to provide a series of alternate'peaks and valleys, said peakslying on a line parallel to the back edgeand within the plane of one ofy the sides; said vsides'i'sxtending from the back edge toward the cutting edge and terminating in a zone intermediate said back edge and said peak line, and the valleys extending from said peak line toward said back edge to a depth short of said zone; opposite, primary beveled faces extending throughout the length of the body and respectively adjoining the sides of the body along straight lines and converging therefrom toward saidpeak line and gradually thinning out the thicknessof the` body between said zone and the cutting edge, said faces meeting at the peaks to provide said peaks with sharp cutting points; and a secondary beveled face along the profile of each valley and extending from one cutting point to a neighboring cutting point, and further merging with the primary beveled face at one side of the valley and converging toward and meeting the opposite primary beveled face to provide on said valley a sharp cutting edge portion contiguous with said neighboring cutting points.

2. A cutting blade, comprising: an` elongated, relatively thin body having a back edge, a cutting edge, and opposite, generally parallel Sides; said cutting edge being scalloped lengthwise thereof to provide a series of alternate peaks and valleys, said peaks lying on a line parallel to the back edge and Within the plane of one of the sides; said sides extending from the back edge toward the cutting edge and terminating in a zone intermediate said back edge and said peak line; opposite, primary beveled faces extending throughout the length of the body and respectively adjoining the sides of the body along straight lines and converging therefrom toward said peak line and gradually thinning out the thickness of the body between said zone and the cutting edge, said faces meeting at the peaks to provide said peaks with sharp cutting edge portions; and a secondary beveled face along at least a portion of the profile of each valley between one peak and a neighboring peak, and further merging with the primary beveled face at one side of the valley and converging toward the opposite primary beveled face to provide on said valley a cutting edge portion intermediate said neighboring peaks. Y

3. A cutting blade, comprising: an elongated, relatively thin body having a back edge, a cutting edge, and opposite, generally parallel sides; said cutting edge being scalloped lengthwise thereof to provide a series of alternate peaks and valleys. said peaks being alined and lying within the plane of one of the sides; said sides extending from the back edge toward the cutting edge'and terminating in a zone intermediate saidv back edge and said peak line; opposite, primary beveled facesextending throughout the length of the body and respectively adjoining thesides of the body along straight lines and converging therefrom toward said peak line and gradually thinning out the thickness of the body'between said zone and the cutting edge,'said faces meeting at the peaks to provide said peaks with sharp cutting edge portions; and a secondary'beveled face alongat least a portion of the profile of each valley between one peak and a neighboring peak, and further adjoining the primary beveled face at one side of the valley at an obtuse angle and converging toward and joining the opposite primary beveled face at an acute angleto provide on said valley a cutting edge portion intermediate said neighboring peaks. j k

i-i. The invention defined in claim 3, further characterized in that: the prole of eachvalley includes a relatively lor'g` cutting edgeV portion vEi Aextending from one peak a major part'of the distance between said one peak and a neighboring peak, Aand a contiguous relatively short hooked cutting edge portion extending the remainder of the distance to saidl neighboring peak.

'5. A cutting blade, comprising: an elongated, relatively thin body including a longitudinal base section having opposite, longitudinal, parallel sides, and further having a longitudinal cutting section integral with the base section and being of reduced thickness as compared to the vbody bythe provision thereon of opposite beveled faces extending throughout the lengthof the body and respectively adjoining said body sides along straight lines and converging to a longitudinal cutting edge lying in a longitudinal plane within said opposite sides; said cutting section vbeing scalloped lengthwise. of the cutting edge to provide a series of alternate peaks and valleys; said peaks being disposed at the convergence of said beveled faces and comprising thereat sharp cutting edgeportions; the profile of each'of said valleysA intersecting said converging vfaces within Vthe cutting'section; and each proiilehaving a :secondary bevel thereon sharply angled to Vone of `sad beveled faces to provide such profile with a sharp cutting edge.

.6..A cutting blade, comprising: an elongated, relatively thin body including a longiudinal base section having opposite, longitudinal, parallel sides, and further having `a longitudinal cutting section. integral with the base section and being of vreduced thickness as compared to the body by the'provision thereon of opposite beveled'faces extending throughoutk the length of the body and respectively adjoining said body vsides along straight lines and convergingto a longitudinal y,cutting edge lying in a longitudinal plane within V`said opposite sides; said cutting section being scalloped lengthwise of thecutting edge to provide a'series of alternate peaks and Curved valleys; said Vpeaks being .disposed at the Convergencer of said beveled facesv and comprising threat sharp cutting edge portions; the curved prof-lle of each of said valleys intersecting said converging faces within the cutting section; and each profile having'a secondary bevel lthereon sharply angled to one of said beveled faces and eccentric to the profile curve to provide such profile with a sharp cutting edge.

7. A cutting blade, comprising: an elongated, relatively thin body including a longitudinalbase section having opposite, longitudinal, parallel sides, and further having a longitudinal cutting section integral with the base section and being of reduced thickness as compared to the body by the provision thereon of opposite beveled faces extending throughout the length of the body and respectively adjoining said body sides along straight lines and converging to a longitudinal cutting edge lying in a longitudinal plane within said opposite sides; said cutting section being scalloped lengthwise of the cutting edge to provide a series of alternate peaks and valleys; said peaks being disposed at the convergence of said beveled faces and comprising thereat sharp cutting edge portions, each of a thickness materially less than the thickness of said base section; the profile of each of said valleys intersecting said converging faces within the cutting section; and each profile having a secondary bevel thereon sharply angled to one of said beveled faces to provide such profile with a sharp cutting edge.

8. A cuttinggblade, comprising: an elongated,

relatively thin body including a longitudinal base ,section having opposite, longitudinal, parallel sides, andk further havinga ylongitudinal cutting section integral with thebase section `and-being of reduced thickness as compared to the body by theprovision thereon of opposite beveled faces extending throughout the length of the body and respectively adjoining said ybody sides along straight lines and rconverging to a longitudinal cutting edge lying in a longitudinal planerwithin said opposite sides; said cutting section lbeing scalloped lengthwise of the cutting edge'` to provide a series of alternate peaks and curved valleys; said peaks being disposed at the convergenceof said beveled faces and comprising there vat sharp cutting edge portions, each of av thickness materially less than the thickness of said base section; the curved prole of each of said valleys intersecting said converging faces within the cutting section; andveach pronle'having a secondary bevel thereon sharply angled vto one of said beveled faces and eccentric to the profile curve to provide such profile with a sharp cutting edge.

.9. A cutting blade, comprising: an elongated, relatively thin body including a longitudinal base section having opposite, longitudinal, parallel sides, and further having a longitudinal cutting section integral with the vbase section and being of reduced thickness asfcompared to the body by the provision thereon offopposite beveled faces extending througout the length of the body vand yrespectively adjoining said body sides along straight lines and vconverging to a longitudinal cutting edge lying ina longitudinal plane -within said opposite sides; said cutting section being scalloped lengthwise of the cutting edge to provide'a series of alternate peaks and valleys; said peaksbeing disposed at the convergence of said beveled faces and comprising'thereat sharp cutting edge portions and eachv-alley having a hooked-curve profile; the prole of each of said-valleys'intersecting said converging faces within the cutting section; and each profile having a secondary bevel thereon sharply angledto one of said beveled faces to provide such profile with a sharp cutting edge.

10. A cutting blade, comprising: an elongated, relatively thin body including a longitudinal base vsection `having opposite, lOngitudinal, parallelr sides, and-further having a longitudinal cutting section'integral with the base section'and being of reduced thickness as compared to the body by the provision thereon-of opposite beveled faces extending 'throughout the length 0f the body and respectively `adjoining said 'bod-y sides along straight lines kand converging 'to `a vlongitudinal cutting edge lying in a'longitudinal plane within said opposite sides; said cutting section being scalloped lengthwise of the cutting edge to provide a series of alternate peaks and curved valleys; said peaks being disposed at the convergence of said beveled faces and comprising thereat sharp cutting edge portions and each valley having a hooked-curve profile; the curved profile of each of said valleys intersecting said converging faces within the cutting section; and each profile having a secondary bevel thereon sharply angled to one of said beveled faces and eccentric to the profile curve to provide such profile with a sharp cutting edge.

11. A cutting blade, comprising: an elongated, relatively thin body including a longitudinal kbase section having opposite. longitudinal, parallel sides, and further having a longitudinal cutting section integral with the base section and being of reduced thickness as compared to the body by the provision thereon of opposite beveled faces extending throughout the length of the body and respectively adjoining said body sides along straight lines and converging to a longitudinal cutting edge lying in a longitudinal plane Within said opposite sides; said cutting section being scalloped lengthwise of the cutting edge to provide a series of alternate peaks and valleys; said peaks being disposed at the convergence of said beveled faces and comprising thereat sharp cutting edge portions, each of a thickness materially less than the thickness of said base section and each valley having a hooked-curve profile; the profile of each of said valleys intersecting said converging faces Within the cutting section; and each profile having a secondary bevel thereon sharply angled to one of said beveled faces to provide such profile with a sharp cutting edge.

12. A cutting blade, comprising: an elongated, relatively thin body including a longitudinal base section having opposite, longitudinal, parallel sides, and further having a longitudinal cutting section integral With the base section and being of reduced thickness as compared to the body by the provision thereon of opposite beveled faces extending throughout the length of the body and respectively adjoining said body sides along straight lines and converging to a longitudinal cutting edge lying in a longitudinal plane within said opposite sides; said cutting section being scalloped lengthwise of the cutting edge to provide a series of alternate peaks and curved valleys; said peaks being disposed at the convergence of said beveled faces and comprising thereat sharp cutting edge portions, each of a thickness materially less than the thickness of said base section and each valley having a hooked-curve profile; the curved profile of each of said valleys intersecting said converging faces within the cutting section; and each profile having a secondary bevel thereon sharply angled to one of said beveled faces and eccentric to the profile curve to provide such profile With a sharp cutting edge.

13. A cutting blade, comprising: an elongated, relatively thin body having a back edge, a cutting edge, and opposite, generally parallel flat sides; said cutting edge being scalloped length- Wise thereof to provide a series of longitudinally spaced, alternate peaks and curved valleys, said peaks lying on a line parallel to the back edge and in the longitudinal median plane between said sides; each of said sides extending from the back edge toward the cutting edge for a distance approximately two-thirds of the distance between said back edge and said peak line, and terminating along a straight junction line parallel to said back edge, and the valley curves extending back into the body to a depth short of said junction line; opposite, primary beveled faces extending throughout the length of the body and respectively adjoining the sides of the body along said junction lines and converging therefrom to- Ward said peak line and gradually thinning out the thickness of the body from the junction lines to the peak line, said faces meeting at the peaks to provide said peaks with thin, sharp cutting points; and a secondary beveled face cutting across each valley curve at an angle to the primary beveled face at one side of the bodyfand running along the valley curves from one cutting point to a neighboring cutting point, said secondary beveled face merging with the primary beveled face at one side of said valley along a curve between the valley curve and the junction line at that side of the body, and saidsecondary face converging toward and meeting the opposite primary beveled face to thin out the lateral dimension of the body along said valley and to provide said valley curve with a sharp cutting edge portion contiguous with said neighboring cutting points.

14. The invention defined in claim 13, further characterized in that: the profile of each valley includes a relatively long cutting edge portion extending from one cutting point a major part of the distance between said one cutting point and a neighboring cutting point, and a contiguous relatively short hooked cutting edge portion extending the remainder of the distance to said neighboring cutting point.

15. The invention defined in claim 13, further characterized in that: the curve of each valley includes a relatively long portion as an arc having a relatively long radius, and extending from one cutting point, and said curve further includes a contiguous portion as an arc of relatively shorter radius and extending to a neighboring cutting point.

JOHN HANSEN.

REFERENCES CITED The followingreferences are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 617,964 Krank Jan. 17, 1899 1,951,606- Gellman Mar. 20, 1934 FOREIGN PATENTS Number Country Date 279,947 Great Britain '.Nov. 7, 1927

Images