US 2472876 A
Description (OCR text may contain errors)
June 14, 1949.` A. H. AHRNDT' ETAL ROTARY DISK KNIFE 2 ShAets-Sheet 1 Filed April 21, 1944 j2me/225:5 I ma/'mjy Junel4, 1949. A. HQAHRNDT `l-:T AL 2,472,876v4 `ROTARY DISK KNIFE z'sneets-sheet 2 Filed April 21, 1944 Patented June 14, 1949 ILC 2,472,8rc
RTARY DISK ArtliiirHl;` Ahrndt and Paul H. Meyer, La Porte,
pany,.La Port'e,aInd., a, corporation 0i"l IIndianay Application Amiral, 194%, Serial N; fs''az 1` claim. (Cananea) This in'ventien rlatsii'tislicihfgknltslandlore particularly 'to laicircular' orgeneiallydisk-shaped slicing knife for use slicing v-inaeihi-'r'i'i'es employing a rotary slicing'kniielior' slicing-'substances suol-i fas in'eat and other materials.
An object of thisv invention i'sto provide vcli-ifi".- able, simple and `ef ient slicing means'vwhichiwill notfrl'i-St; Which'will-n'otf-'stain 'or' contaminate the substance sliced, which Will retain a sharpcutting e'dge,- and' which, vif-hen dulld byf'us; may be'L ground to produce a.J new cutting edge' with minimum effort /andwa'steof material.
vIt has been the-practice 'to 4'e`rn1il'cy'- carbon vsteel knives for such purposes.- plait'ing thej'kn'ives to avoid-rustand-ffcr hygienic reasons.' Theplatin-g operation involves 'the exercise of considerabie the provision of increased'fth'iicknesa offvthe-knife l adjacent the cutting edge Withithe'. result that .in the grindingofsuchnknives. whenidull there is either increas'ed'-vvas't of material or undesired enlargement of the beveledi's'urf-ace adjacentthe veu'tting edg'e.l v K y The presenti invention overcomes the disad- '1V'aritagesl incident te the` manufacture *f 'slicing vlirivesfof 'carbon steel inthe use of stainless's'te'el. This -.maybe providedin thefferrn of argenerally round, at blank-ofapproximately the desired thickness, which may be shaped to generallydiskliker'dish form on a puncl'r'press and reinforced 'byi-theadditien -of a; central vfsiiififeiier orrein'fcrciigiplate which yis spot welded li'rplace.v :Thereafter the peripheral portion of the disk may be hardened and ground to provide a durable cutting edge, reserving a generally soft or unhardened center which is not subject' to deection or deformation to the same extent as the conventional, hardened carbon steel knife.
Another object of this invention is to provide a generally disk-shaped slicing knife having a hardened peripheral portion with opposite surfaces arranged in parallel relation with one another and a beveled periphery comprising a cuti ieefted einbeeiineni; o
tingfedge, the fcuttingied'gepreferably 'beingat one "of the "parallel surfaces;
A' fi-.irthe'r 'object 'of' the" invention is the provision: offs'uehfa' nevar-rari'ged'y tofbefn'iounted for rotation; abou anliaxslnormalftel a surface 'ofits l'centraliportie and having suena hardened- .periplieraipertienl disposed in angular', radially spaced relfatin thelA saidf'ax'island:A ai peripheral`y bevel dispeseulin'l angular relation withthe pal surfaces. l
.A'riadiit'ional 'obet"voff-theiihventin :is-to prvide aslieiii' lenife'wnavi 'avl dish-shaped' body, er'ilpiieifa'l-pertiefi; andaiilinelined portieri connecting? the-L' been' and the annular pori-tien'.
other yoleieciisYer1:tifeinventieiiinclude the v`pre`- alslieing miei-raving'afperipheral pori'f'i'enfo'tg geneiallyunifoiin thickness "andi a cutting edge*withlelgeiiierailyuniforml bevel;v which ma'y 1nefs-n'ariseneenfreir-i1- me @time withal-minimum @fieber-andrea of materieller provide a new euiiingi-'edg @of abstantiauy like feria' and-idi- :.wtiieiprevisienior "arianne-wana nelyf or sapstaiitiaiiy uniform i 'iii-i@kneesv and an e thickness: ndditienaiebectsadvantagesfand capabilities erit n'fth'is invention will beccme'readily' appar nrt frein e descripiifentheieer which follows. nven ea'rrertiierfresi-desl theeemb'inaitien f nstratie anaarrangement lo'f parts 'i1-lustatedl 1n-Tt companfyiigfdrawinlgs; and -whifle there is strewn herein preferred embodiments of 'the ifi-venti n ite befunderstoed thatthe'same are susceptible inbdiatin' and" yclia-r'ige with;
earl-depara 'g fiom-fine spirit lef the invention:
aecompanyfngdrawings illustrate a seitlie invention-anu thevi'e'ws 1tllieifeinllaire asfffoll Fig; rais iafeental, sectibriai view lof tnefknife shown in Fig. l;
Fig. 3 is a fragmentary, sectional view of a reinforced blank employed in forming a knife embodying thel invention; and
Fig. 4 is a yfragmentary view of the black shown in Fig. 3 after being ground to form, With original outlines of the blank indicated in dotted lines, and additional angular dotted lines indicating cutting edges resulting from regrinding from time to time.
The particular knife Il] herein disclosed for the purpose of illustrating the invention comprises a generally disk-like body II which, as shown, is of stainless steel and provided with a central, reinforcing plate I2 spot welded thereon. A central opening I3 co-axial with the body II and the plate I2 is provided for mounting the knife on a shaft of a slicing machine for rotation.
The body I`I and the plate I2 may be formed from flat disks of stainless steel which are shaped in a punch press, the plate I2 being shaped to the form shown in Fig. 2 and the body Il being shaped to provide a peripheral portion I4 of the form shown in Fig. 3 and indicated in dotted lines in Fig. 4.
Thereafter the peripheral portion I4 of the knife is hardened and then ground to the form shown in Fig. 4, the waste or ground oi portion being indicated in dotted lines in that iigure. The grinding of the peripheral portion of the body II of the blank shown in Fig. 3 is conducted to produce a portion of desired thickness, which may be of the order of .048" to .050", with opposite, preferably parallel surfaces I5 and I6, a peripheral bevel I1, and an adjacent cutting edge I8. The hardened portion of the knife, including the surfaces I5 and I6, extends inwardly from the cutting edge I8 a substantial distance to provide for repeated grinding of the cutting edge to provide new cutting edges, as indicated by the dotted angular lines in Fig. 4, With beveled portions I1 of like dimensions and angular relation with the original beveled portion.
The knife Il) thus produced is generally diskshaped with a depressed central portion I9 having opposite surfaces and 2| disposed in planes substantially normal to the axis 22 of the opening I3, intermediate portions 23 and 24 arranged in angular, radially spaced relation with the axis 22 and with one another, a peripheral portion having opposite surfaces I5 and I6 parallel with one another and disposed in angular, radially spaced relation with the axis 22 and the intermediate portions 23 and 24, and a peripheral bevel I1 disposed in angular relation with the surfaces I5 and I6 and providing a circular cutting edge I8.
'Ihe formation of a slicing knife in the manner stated, using stainless steel, enable the provision of a knife having a bevel approximately M3 wide adjacent the cutting edge and the maintenance of a bevel of like Width through successive regrinding operations until the available hardened portion of the knife, which ordinarily will extending a depth of 1%," inwardly from the cutting edge of the knife, is exhausted.
An example of a slicing knife embodying the invention which has been found satisfactory may be described as follows: A iiat disk of stainless steel 1/8 thick is centrally reinforced by welding thereon a circular plate of like material gif thick. The composite article is shaped in a punch press to generally dish form, as shown in Fig. 3, with a substantially flat central portion of approximately 3" in diameter, an adjacent, intermedi- CII ate annular portion approximately 5 wide and having an outer diameter of approximately 9%", an annular peripheral portion approximately 11/8" wide and having an outer diameter of approximately 11%", and an angular portion connecting the said peripheral portion and the said intermediate portion and having opposite surfaces arranged in parallel relation with one another and disposed at an angle of approximately 30 with the said surface of the central portion. The peripheral portion is hardened by induction. The peripheral portion and the adjacent connecting portion are then ground to the form shown in Fig. 2, providing a connecting portion having opposite, parallel surfaces spaced approximately g apart, a peripheral portion having opposite, parallel surfaces spaced approximately .050" apart and disposed at an angle of approximately 2 in relation to a plane parallel with the said surface of the central portion, and a peripheral bevel approximately 1/8" wide to provide a cutting edge at the upper surface of the said peripheral portion, viewing Fig. 2.
Changes may be made in the form, construction and arrangement of the parts without departing from the spirit of the invention, and the right is hereby reserved to make all such changes as fairly fall within the scope of the following claim.
The invention is hereby claimed as follows:
A circular knife for meat slicing machines and the like comprising an outer peripheral thin circular rim having straight, flat, parallel sides extending in a direction perpendicular to the axis of the knife and terminating in a cutting edge, an inner integral section extending from the inner end of the rim at an angle from the plane of the rim and having parallel sides, a dish shaped central portion extending inwardly from the inner section and integral therewith, said central portion increasing in thickness toward its center, and a central circular reinforcing section fixed to the concave part of the central dish shaped portion and conforming in shape thereto and of less diameter.
ARTHUR H. AHRNDT. PAUL H. MEYER.
REFERENCES CITED The following references are of record in the ille of this patent:
UNITED STATES PATENTS Number Name Date 22,711 Lane Dec. 16, 1879 1,607,879 Drucker Nov. 23, 1926 1,679,508 Stukart Aug. 7, 1928 2,065,572 Folk Dec. 29, 1936 2,338,139 Slayton Jan. 4, 1944 FOREIGN PATENTS Number Country Date 579,001 France 1924 287,494 Germany 1915