US2664931A - Sectional chip breaker - Google Patents

Description

Jan. 5, 1954 J. s. BALLANTINE SECTIONAL CHIP BREAKER 2 Sheets-Sheet 1 Filed May 17, 1949 J. S. BALLANTIN E SECTIONAL CHIP BREAKER Jan. 5, 1954 2 Sheets-Sheet 2 Filed May 17, 1949 lllrllll Patented Jan. 5, 1954 2,664,931 SECTIQNAL: CHIP BREAKER. am s. Bal an n bso nr N 'Apnlication May li', 1949, Serial No. 93;702

screen 01444-444) The present ntent on re atess-to sect ona hip rs for wo dplaninemachines and theike d m g n ral t improteithee on truc on and operation of devices. of this..type.;

A primary object of the invention is .theprovision'of a sectional chip breakerofimproved construction and operation for planing. machines wherein the possbility of fragments of wood such as chipsand the like becoming lodged-into the working parts of the machine to disrupt operation thereofis substantially minimized and wherein means are provided for automatically comminuting' chips-orthe like which may accidently lodge in certain parts of the machine subject to be adversely afiected thereby.

A further object of the invention is the provision of asectional chip breaker of novel and simple construction in whichparts of the device likely to be adversely afiected by chips and the like arepartly enclosed and shielded from flying chips.

A still further object of the invention is the provision of a sectional chip breaker of improved construction wherein the weight of the device and its pivotal mounting insures intimate contact of the chip breakers with the material being processed and wherein the chip breakers are mounted for individual and/or collective yielding movement in response to the surface characteristics of the material being processed.

Another object of the invention is the provision of a sectional chip breaker in which chips or fragmentsof wood which accidently penetrate into certain parts of the machine likely to be damaged or obstructed thereby are automatically comminuted to thus eliminate the possibility of such damage or obstruction.

These and other objects and advantagesv of the invention will be apparent from a consideration of the accompanying drawings and appended specification which illustrate and describe apreferred embodiment of the invention.

In the drawings:

Fig. l is a plan view showing portionsof a planing machine with my improved chip. breaker attached thereto;

Fig. 2-is, a plan view; of the chip breaker;

Fig. 3 is a front elevational view of the chip breaker as viewed from the bottom in Fig. 2;

Fig- .4 is a vertical cross-sectional view of the chip breaker taken on the line 44 of Fig. 1;

Fig. 5 is a plan View of the cutter ring;

Fig. 6 is a vertical cross-sectional View of the cutter ring taken on the line 5- 5 of Fig. 5;

Fig. 7 is a vertical cross-sectional View similar to Fig. 6 of a modified form of cutter ring; and,

Fig. 8 isa vertical cross-sectional view similar to Fig; 6 of a further modified form of cutter ring.

2: In accordanc wi h; th present invention :the mpr ved.- ohipbreaker device I llcomprises a. plus a ty of individualpresserreet it adapted totrest' n. ap ank. ortherl ke betweenitneicutterghead l1 ndthe.inloedrrollzli ofablaner.- The Dresser et 1 I are than .zeuiiiethe wood chips; up: themtoflv-outwsrdlr noomingplank; and: are ndivi u l y mo nted-on a. uide bar. It or war,- oal ye on at d rectan ularor ss-seotion; ion limitocbvortioal mov mcnt a commodate local .1.0 0 hematerial. suchvas aplank; bei gplaned Add 1.0. merit ofth pressenafeet'is, providcdy.for--by a. pivotal constru tion: comprising1-- armsl5 and -l6 secured to the en s. ot thegnide .bar- M andepive otally mounted onqt: Divot-pins. .llrand l-81se-- Cured in ho-sid immemombers .l 9 "and: :2 Over the pianerv Thus. smallervatiationsin. thickness ofthe ,rnaterialabe' k -out-areautomatically-accommodated by-t o: dividual press rwhile ..-l,argervariations. inthi kn ss are accommodated.- by the clockwise pivoting of the chip breaker In about the .pivot Downward movement or the: nresseri'eet-l his limited y -an-.zadinstablawstop; device.- comprisin adjustable screw -21: nd 121:..scre th carr odbyproiect n ems-Mandi: -t bar u and adapted tov en a e. protecting; stops 25 an 26. secured. to thefsid frama-memberssl 9 nd 20;; For normal; operation: the-.adjustable s p device is; adiustod :so. that. the lower boa-rd c ntacting 'surfacesvct the: presser wfeet; I. 1 are positioned somewhat below; for; example: onesixteenth" ofsanzin h; below the-zlowestsportion of the euttingioirol'e of.atheycutterrhead1:2:

Theprosso toot I: comprise abodxportionil and afoot-porn. :...-.2.&s The'footpcrtion 2'a=.eX': tends downwardly and rearwardly from;v the body portion-21".andbaswa; lowenboard-engaging surface 29 and unperxourvodx chin nidingzsnrface 30;. urve rob-in uiding; surface.- 3.0 forms;v a continua ion -of; the .rearwardly memes surface or tha body-portion- 21 and;- serves; :in onjunc i n therewith; to: 'guide and direct: the chip pwardly; in th lmaohines.

As pointed out hereinberore the Dresser-feet fl 1. are, individually mounted on the guide bar M: or vertically.elongatedrectan ular CI'OSSwSGOfiQD for limited vertical movement; response to local variations in thickness of a board..being.= out; For hi purpose. therear side ofz-thabodr portion; 21 pp s t th -r arW rQIri-n Iin. .zobip euid ne u-m face 3| is out;Outsta-formra'zu-shapedrectan ular recess or opening-13,2. -andtupper and; lower-mm jectingfianged portionsorwalls 33 and, The recess -32 isshaped :tohousathc. guide. bar- .I 4 and issomewhat, longerin itsvertioalldimension. than verticalrmovementofthe in:

the vertical thickness thereof to permit the desired limited vertical movement of the chip breaker thereon. The inner wall of the recess forms a bearing surface having sliding enga ment with one side of the guide bar. The presser feet are held in position on the guide bar M by bolts 35 which pass through aligned vertical bores 36 and 31 in the flanges 33 and guide bar [4 respectively and are screw-threadedly engaged with threaded vertical bores 38 in the flanges 34 aligned with the aforesaid bores. Springs 39 surround the lower ends of the bolts 35 and have one end thereof seating against the upper ends of the enlarged counterbores 40 in the lower portion of the guide bar 14 and the other end thereof seating against the flange 34 of the body portion 21'. The upper portions of the springs are housed within the counterbores. In the construction shown the bolts 35 are freely slidable in the openings 31 of the guide bar l4 so that the presser feet II can at all times move upwardly against the action of springs 39 in response to unevenness in the material being cut.

As will be apparent from the description thus far, the mounting of the presser feet II is so arranged that the elements thereof which are likely to be clogged and/or obstructed by chips, sawdust, and the like are substantially shielded from the path of movement of such chips and the like so that clogging is reduced to a minimum. However, in the absence of complete enclosure, par ticles may sometimes seep into the working parts and prevent proper functioning of the device. This is particularly true in the case of particles. chips, and the like which may lodge between the lower surface of the upper flanges 33 and the upper surface of the guide bar l4 since the presence of such particles prevents proper seating of the presser feet with consequent inefficiency of operation.

In accordance with the present invention the possibilities of such clogging action are substantially eliminated by the provision of suitably shaped metallic rings 4| loosely surrounding the bolts 35 between the flanges 33 and the guide bar l4 and designed to comminute chips lodging in such areas and cause them to fall out under the vertical vibrating movement between the two parts. The metallic rings 4| are preferably hexagonal in cross-sectional shape as shown in Figures 5 and 6 but may alternatively be diamond shaped or square as shown by the rings 42 and 43 of Figures '7 and 8 or other desired shape which will provide opposite sharp edges disposed for coaction with the opposing surfaces of the flanges 33 and guide bar l4.

In the operation of the device, as a board or the like advances under the presser feet H, the latter will move vertically against the action of the springs 39 and thus adjust themselves to any unevenness in the surface of the lumber. Vertical movement of the presser feet H is limited to the flanges 34 striking the lower edge surface of guide bar l4. Thus if the unevenness of the lumher is such as to require a vertical movement of the presser feet greater than this, the entire mechanism will pivot about the pivot pins 11 and I8. Such pivoting movement is resisted by the weight of the chip breaker mechanism which is designed to correctly tension the springs 39 to exert the desired bearing pressure. Suitable weights or the like may be used to secure the desired tension of the springs 39. Thus upward vertical movement of the individual chip breakers is resisted in the flrst instance by the springs 33 and in the second instance by a part or all of the weight of the entire mechanism. Hence the possibility of damage to the mechanism by the uneven character of the stock being cut is substantially eliminated.

Furthermore, the possibility of clogging the machine by chips or the like is substantially diminished by a construction in which the parts likely to be clogged are substantially enclosed and shielded from the flying chips. And finally, stray chips which do lodge in the area between the flanges 33 and guide bar H are rapidly comminuted and discharged so as not to interfere with the proper functioning of the device.

Various modifications of the invention described and illustrated will most likely occur to those skilled in the art to which the invention relates and may be made without departing from the spirit of the invention, the scope of which is indicated in the attached claims.

I claim:

1. A chip breaker comprising a guide bar, a plurality of presser feet mountd on said guide bar, each of said presser feet having a recess therein for receiving said guide bar, the width of the guide bar being less than the length of the recess in each presser foot, aligned openings in said guide bar and each of said presser feet, pins disposed in said aligned openings for mounting said presser feet on the guide bar, a ring mounted on each of said pins between the guide bar and a wall of said recess, said ring being shaped to comminute chips and the like lodging in such area, and resilient means for urging each of the presser feet downwardly.

2. A chip breaker as set forth in claim 1 in which said ring is hexagonal in cross-sectional shape.

3. A chip breaker as set forth in claim 1 in which said ring is diamond shaped in cross-sectional shape.

4. A chip breaker as set forth in claim 1 in which said ring is square in cross-sectional shape.

5. A chip breaker comprising a guide bar, a plurality of presser feet mounted on said guide bar, each of said presser feet having a recess therein for receiving said guide bar, the width of the guide bar being less than the length of the recess in each presser foot, aligned openings in said guide bar and each of said presser feet, pins disposed in said aligned openings for mounting said presser feet on the guide bar, a chip displacing hard element interposed between the opposing surfaces of the upper wall of the recess of each of the presser feet and the upper side of the guide bar, said chip displacing elements embracing the pins and being mounted for movement relative to both said opposing surfaces and adapted to prevent accumulation of chips in the recess in the area of said opposing surfaces.

JAMES S. BALLANTINE.

References Cited in the file of this patent UNITED STATES PATENTS

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