US1542812A - Roll for beating engines - Google Patents

Description

June 23; 1925.

' A. J. ALLISON ROLL FOR BEA'IING ENGINES Filed June 16, 1924 m m 1 AT Qf a 9/ Patented June 23, 1925.

UNITED STATES Kl'ATENT OFFICE.

ALBERT I. ALLISON, OF DAYTON, OHIO, ASSIGR'OB TO THE A. A. SECONDS-DAYTON COMPANY, OF DAYTON, OHIO, A CORPORATION OF OHIO.

ROLL FOR BEATING ENGINES.

Application filed June 16, 1924. Serial No. 780,274.

T 0 all whom it may concern: Y

Be it known that I, ALBERT J. ALLISON, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented new and useful Improvements in Rolls for Beating Engines, of which the following is a specification.

This invention relates to rolls for heating engines used in refining paper pulp, and it pertains to securing the knives or bars to the rolls in such manner that not only are the bars not liable to work loose, but should it be necessary to remove a bar it may he done without disturbing the other bars in the roll. The merits of the invention will be more readily appreciated after it has been described, so I shall proceed with a detailed description of one embodiment, illustrating the description with the accompanying drawing, in which,

Figure 1 is a longitudinal section of a portion of a heater roll;

Figure 2 shows a portion oi' one head of a roll, seen from the inside of the roll;

Figure 3 shows a fragment of the periphery of the head, looking toward the axis of the roll;

Figure 4 is a view of the wedge used for securing a bar in a slot on the periphery of the head, and

Figure 5 is sectional \icw of a fly bar.

The roll comprises two heads 10 secured to ashaft 11., Each head has a heavy annular rim 12 in which a series of radial slots 13 formed Fig. 53), adapted to receive the corners of ily bars 14. One wail of each slot, the wall 15, is parallel to the axis of the roll. This is shown in Figure 3, where the line 12 represents the axis of the roll. But as is seen in Figure 2, this wall is not radial. It lies in a plane tangent to a circle having the axis of the head as a center. Being parallel to the axis of the roll th s wall i5 is perpendicular to the fare of tin lead. The opposite wall of each-slot, 16, loans with infra-once to the axis of the head, as does the wall 15, and it also loans with reference to the face of the head, so that the slots are broader at one side of the head than at the other, while the walls diverge inwardly, so that the slots are broadest at the bottom. Between the heads I placeoa or more spiders 20, which spiders have slots similar in the slots 13 in the heads, except. that the slots extend clear across the periphery of the spider, while the slots of the heads are closed at the outer faces of the heads by webs 17, which give the heads a smooth exterior. In order to allow the fly bars to extend to a point flush with the outer faces of the heads the bars are notched as at 21, to provide for the webs 17.

Referring to Figure 5, it will be seen that in cross section one side of the fly bar is fiat. For convenience I shall call this the back of the bar. At a point near its center the bar is thickest, and from this central point the thickness of the bar gradually diminishes. Thus the bar has two faces, 25 and 26, each of which is at an angle to the back. the thickest part of the bar is not uite at the center, one edge of the bar is slig tly thicker than the other edge; in practice this difierence is about one sixteenth of an inch. The reason for making the bar with edges of unequal thickness is that some users of beater bars, or in certain classes of work, a thin edge is desired to cooperate with the stationary blades of the beating engine, in which case the thick ed e of the bar is set 50 in the slots in the hen s. For other urposes a thicker workin edge is desire if so the thin ed e of t e bar is set in the slots, leaving the thick edge for work.

Having decided which e of the bar is to lie in the slots in the h s and spiders,

a channel 27 is milled in each bar to receive the splines 28 on the wedges 291 It is not necessary to mill the channel the full length of the bar: it sullices to mill the portions of Q the bar which are to be confined in Slots plus a length about equal to the length 0% the wedges. The wedges taper endwise as well as radiall In other words, they are of a form to fi l] the space in the slots unoccupied by the bar. After a bar is set in place a wedie is driven into each 8101;, thus securing t e bars firmly. It is GUS- trunary to fill a portion of the space between the ha rs of a heater roll with strips of wood. This being common practice and well understood in the art it is not necessary to illustrate these or explain them farther.

One function of the channel 27 in the fly bar is to receive the spline 28 on the wed thereby tying the bar and wedge together, while leaving the wedge free to be driven tightly into the slot in the head. Another function of the channel is to facilitate the securing of the bar with the wedge. In pracit is not ties the slots 12 in the heads are formed with cores when the heads are cast, and the wedges are malleable iron castings. Made in this way the parts may not always tit perfectly, 'l'lu-relm'e, when a wedge is driven home it may immune tight near the bottom of the slot, while it is still loose at the upper part of the slot, 01' it may tighten first at the upper part or eren in the middle of the slot. The channel in the bar divides the area on which the wedge lmars into two parts, separated. by the median area occupied by the channel, and in order to preserve this separation the depth of the channel is made greater than the height of the spline, so the spline will not bottom in the channel. Being made of malleable iron the wed are capable of compressing as they are ven home, enahlin them to conform to the conditions whit-h diam If one portion of the wedge ti htens before other portions, compression 0 the tight portion permits the wedge to be driven farther in, without undue strain on the. parts, until all portions of the wedge, except that opposite the channel, have heeolne tight Thus a result is obtained analogons to that which would be produced were two indepemlent wedges used, one in the lower part and the other in, the upper part of the slot. If desired. the wall 15 of each slot may be depressed slightly in the middle, so that the imci: of the bar will lie against the wall of the slot only at. the top and bottom. Thi hown at 18, in Figure 2, but nual in the carrying out of my invention, because unli'ss tho wall of the slot is very nnlevel the bar will flex enough as the wedge is driven in to insure the required hearing of the her against the top and bottom of the slot,

The advaz'atage of having the wedge tight at both the. upper and lower part of the slot, notwithstanding it is not light in the median area. will easily be understood. For then the leverage of reaction to a lateral strain on the bar is always the whole depth of the slot. Should the wedge be tight only at the top of the slot, the reaction to a lateral strain on the bar in one direction would be comparatively slight, as the inner edge of the bar could vibrate in the slot, with the tight part of the wedge as a sort of neutral axis. If the wedge were ti ght at the bottom only a similar tho opposite condition would obtain. in each case the bar would be able to resist strain in one direction, but unable to resist strain in the opposite direction. W -ith the wedge tight in the middle only, the lew'erage of reaction woiild never be more than half the depth of the slot. Maximum security, for the bar against lateral strain,

which is the principal strain imposed upon the bar, would be obtained if two separate wedges were driven in, one at the bottom and the other at the top of the slot. This is not only impracticable, and would involve additional channels for tying the wedges to the bar, but by my expedient of relieving the median portion of the wedge. l secure primtieally the same result with much less trouble and expense, and less liability of the wedges becoming loose. The malleable wedges may be driven until a substantially uniform pressure is obtained in the two active areas of the wedge.

Fly bars of the cross section of that shown in Figure 5, but without the channel 27, are well known. Bars of this form are so much used that they are rolled in long lengths by various steel mills and all that is necessary to prepare them for use in beater rolls is to cut the bars into ieces of the required length and then make w atever other pro aration is needed to fit them for the roll trey are to go into. In the present case this consists in milling the channels 27. But the channels might be rolled in the bars at the steel mill, and then nothing would remain but to cut the bars to the required length. The advantage of milling the channelsis thateither the thin or the thick edge may be retained for the working edge, While I prefer fly bars of the section shown, my invention is not limited in its application to bars of this form, as the principles I have described, are applicable to bars of other forms. Nor is my inyention limited to the described embodiment in other particulars. Having described the purpose and preferred embodiment of the in vention, I claim:

1. In a heater roll, in Combination: a head having slots on its periphery for the 1eception of fly bars, the walls of said slots dii 'erging inward, making the slots broadest at the bottom, one wall of'each slot being peipemlicular to the face of the head while thoother wall leans with reference to said face, making the slot broader at one side of the head than at the other; a fly bar, one side of which is adapted to lie against said perpendicular wall and having alongitudinal channel in the other side, and a wedge adapted to drive into the space between the bar and said leaning wall, having a spline on one side which lies in said channel in the has, tying the wedge and bar together, the. width of the wedge being equal to the depth of the slot.

.2. In a heater roll, in combination a head ha ing slots on its periphery for the reception of fly bars, the walls of said slots diverging inward, making the slots broadest at the bottom, one wall of each slot being perpendicular to the face of the head while the other wall loans with reference to said face. making the slot broader at one side of the head than at the other; a fly bar, om Side of which is adapted to lie against said perpendicular wall and having a longitudinal channel in the other side, and a wedge adapted to drive into the space between the bar and said leaning wall, having a spline on one side-which lies in said channel but. does not IEuOll to the bottom thereof, the spline being in a median position on the side of the wedge, leaving areas above and below the spline adapted to clamp the bar as the wedge is driven home.

3. Ida beater roll, in combination: a head having slots on its periphery for the reception of fly bars, the walls of said slots diverging inward, making the slots broadest at the bottom, one wall of each slot being perpendicular to the face of the head while theother wall loans with reference to said face, making the slot, broader at one side of the head than at the other; a fly bar, one side ofwhich is adapted to lie against said perpendicular wall, a wedge to drive between the other side of the bar and the apposed wall of the slot, said wedge being as wide as the slot is deep, and means for relieving the pressure between the wedge and bar over a mcdiana'trea. thereby dividing the pressure into two areas, one area Ktending inward from theto and the o h' r extending outward from t 1e bottom of the slot.

4. Ina beater roll, in combination a head having slots on its periphry for the reception of fly bars. the walls of said slots diverging inward, making the slots broadest at the bottom, one wall of each slot being perpendicular to the face of the head while the other wall loans with reference to said fare. inakin the slot broader, at one side of the head w ion at the other; a fly ba r, one side of which is adapted to lie against said perpendicular wall, a wedge to drive between the other side of the bar and the apposed wall of the slot, said wedge being as wide as the slot is deep, and means for relieving the pressure between the wedge and bar over a median area, thereby dividing the pressure into two areas, one area extending inward from the top and the other extending outward from the bottom of the slot, the wedge being malleable, thereby enabling the wedge to compress in an area. which becoms tight too soon, so other areas may be made tight by further driving.

5. In a heater roll, in combination: a head having slots on its periphery for the reception of fly bars, the walls of said slots diverging inward, making the slots broadest at the bottom, one wall of each slot being perpendicular to the face of the head while the other wall leans with reference to said face, making the slot broader at one side of the head than at the other; a fly bar, one side of which is adapted to lie against this perpendicular wall and having a longitudinal channel in the other side, said perpendicular wall having a median area which is slightly depressed with reference to the remainder of the wall surface, thereby causing the bar to lie against two separate aneas, one extending outward from the bottom of the slot and the other extending inward from the top of the slot, and a wedge adapted to drive into the space between the bar and the apposed wall, having a spline which tits in said channel but does not reach to the bottom thereof, said wedge being aswide as the slot is deep.

6. In a heater roll, in combination: a-heii dp having slots on its periphery adaptedto're; ceive fly bar, one side wall of each slot hav ing a b ar ng a'rca for the bar at the bottom and another bearingarea at the top of the slot, the median area of the wall being depressed; a wedge adapted to drive betweeh the bar and the other wall of the slot, said wedge being as wide as the slot is deep, and means for limiting the effective pressure of the wedge to said bearing areas.

ALBERT J. ALLISON.

adapted to (11'1"8 into the space between the bar and said leaning wall, having a spline on one side which lies in said channel but does not IEufll] to the bottom thereof, the spline being in a median position on the side of the wedge, leaving areas above and below the spline adapted to clamp the bar as the wedge is driven home.

3. In a heater roll, in combination: ahead having slots on its periphery for the reception of fly bars, the walls of said slots diverging inward, making the slots broadest at the bottom, one wall of each slot bring perpendicular to the fare of the head while theother wall loans with reference to said face, making the slot broader at one side of the head than at the other; a, fly bar, one side ofwhich is adapted to lie against said perpendicular wall, a wedge to drive between the other side of the bar and the up posed wall of the slot, said wedge being as wide as the slot is deep, and means for relieving the pressure between the wedge and bar over a median area. thereby dividing the pressure into two areas, one. area xtending inward from the top and the ojh r extendin; outward from the bottom hf the slot.

4. Ina beater roll, in CflfLiilHtlllOfli a head having slots on its periphery for the reception of fly bars. the walls of said slots diverging inward, making the slots broadest at the bottom, one wall of each! slot being perpendicular to the fare of the head while the other wall loans with reference to said fare. mahin the slot broader, at one side of the head w ten at the other; a. fly ha r, one side of which is adapted to lie against said porpendirular wall, a, wedge to drive be tween the other side of the bar and the apposed wall of the slot, said wedge being as wide as the slot is deep, and means for re lieving the pressure lit-tween the wedge. and bar over amedian area, thereby dividing the pressure into two areas, one area extending inward from the top and the other extend ing outward from the bottom of the slot, the wedge being malleable, thereby enabling the wedge to compre s in an anea, which be- ('oms tight too soon, so other areas may be made tight by further driving.

5. In a heater roll, in combination: a head having slots on its periphery for the rece tion of fly bars, the walls of said slots (i rerging inward, making the slots broadest at the bottom, one wall of each slot being perpendicular to the face of the head while the other wall leans with reference to said face, making the slot broader at one. side of the head than at the other; a fly bar, one side of whirh is adapted to lie against this prrpendirular wall and having a longitudinal channel in the other side, said perpendicular wall having a median area, which is slightly depressed with referenre to the remainder of the wall surface, thereby ransing the bar to lie against two separate areas, one extending outward from the bottom of the slot and the other extending inward from the top of the slot, and a wedge adapted to drive into the space between the bar and the apposed wall, having a splinyhich tits in said channel but does not. reach to the bottom thereof, said wedge being as'wide as the slot is deep.

6. In a heater roll, in combination: ahead having: slotson its periphery adapted to'r; (Oil'O tly bar, one side wall of each slot hur in ,L' a lam ng a'rea for the bar at the bottom and slot, the median area of the wall being dopressed; a wedge adapted to drive etween the bar and: the other wall of the slot, said wedge being as wide as the slot is deep, and means for limiting the effective pressure of the wedge to said bearing areas.

ALBERT J. ALLISON.

Certificate of Correction.

It is hereby certified that in Letters u n the ap lication of AlbertJ. il olls for eating En ines, correction as follows: age 3, line the comma, and line Patent No. 1,542,812, Allison, of Dayton, Ohio, or an improvement in errors appear in the 35, claim 4 after the 36, for the word when anted June 23, 1925,

printed s ification re uiring word l iroader strike out read tinzn; same page, line 77, claim 6, for the word bar read bare; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Oflice. Signed and sealed this 21st day KARL FENNING,

Acting Commz'eiorwr of Paten another bearing; area at the top of the Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,542,812, nted June 23, 1925, u n the 'ap lication 0f Aibert'ji. Allison, of Dayton, Ohio, or an improvement in olls for ating En ines," errors appear in the printed syecificatlon requiring correction as follows: age 3, line 35, claim 4 after the word broader strike out the comma, and line 36, for the word when read than; same page, line 77, claim 6, for the word bar read bars; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 21st day of July, A. D. 1925 [m] KARL FENNING,

Acting Oommz'siorwr of Paten

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