US2492684A - Masonry saw - Google Patents

Description

N. C. COATES Dec. 27, 1949 MASONRY SAW 3 Sheets-Sheet 1 Filed Oct. 26, 1946 C. COATES Dec. 27, 1949 MASONRY SAW 3 Sheets-Sheet 5 Filed Oct. 26, 1946 fg/7 a/d/f 604/65 Patented Dec. 27, 1949 :Neligh Clair Coates, Ka

nsas City, Mo, .assignor to Clipper Manufacturing Company, Kansas City, M0,, a corporation of Missouri mplieation0otober 26, 1946, Serial No. 705,825

'11 Claims.

This invention :relates in general to masonry s'aws-zand it refers more :particularly to improvemen-ts ln'117h6 apparatus :and system torsupply-ing lubricant to the disk'cutter in :such saws.

Masonry sawsiare oi roourse well-known, being employed 1 in practice toicut' stone, bricks, tiles, and the like to -the rshapes and sizes needed, for instance in building ronstruotion .and "furnace *building. The eutting' is performed :by a disklike tool rotated at high :speed, theiztool :being "formed of I an :abrasive such as 'Carborundum or 'stee'l'alloy rimmed*withfiiamond-dust. ltlusually is desirable tosupp'lyalubri'oant to thelrim of'the disk where it 'engagesthe workpiece, andiin'the 1 jpa'stithas been customary to jet th'e lubricating fluid against "the sides of iih'e-ciisk so that it :is carried to the rim by centriiugal force. Due to the rough texture of the side -'walls however "this method of application has entailed :cons'iderable .splattering, :an'd'italso 'has'lo'een-characterized by rather uneven distribution'ofthe lubricating fluid around the disk.

It is an object 'of "the vention therefore to 'provide an improved 'nrethod and apparatus "for applying lubricant "to the cutter disk whereby these diflicul'ties are overcome.

Another ob'jectislto provide apparatus for jetting a .lubrioant'toward the cutter fromopposite sides, together with facilities "for "ea's'ily removing.

the .nuid connections from their support.

Another object is to provide an "improvedlubricant circulatingsystem and more particularly a system which will function automatically, without priming, whenever the saw 'is started.

Another object is to provide a sel'fepriming arrangement for a :pump situated above the level of the liquid to be pumped.

Another-object is :to provide an improved valve arrangement :for minimlzing the ;need of ,prim- .ing a pump situated above the level of thevliquid to be pumped.

Another object is to provide an improved pump and also to ,-prouide aniimproved arrangement for driving the pump :and the cutter .disk of .a .ma-

sonry saw :from [a common fpulley.

.-Another objectiis to provide in *a lubricant =circulating system for a masonry :-saw, an improved ,pump i-intake.

Other and further vobjects will appear in the course of the following description of the invention.

In the accompanying drawings form a part of the specification rand iareito bearead in @c'oniunction therewith and on which like :I-Bference numerals are employed to indicate like ,parts of the various views:

Fig. 1 isa-sideelevation of --.a masonry saw embodying the invention, .par tkbeing broken away for purposes of illustration,

Fig. .2 is anelevational view showing the opposite .sideof the upper portion of the -saw,

Fig. 3 is a ,plan vview of the lubricant-circulat- .ing pump for the.saw,=-shown to anen'larged scale,

Fig. Lisa sectional mew-taken along the lines 4-4 of Fig.3 in the direction of the arrows,

Fig. Sisa view taken along theline ll- 5 ofFig. 3 win the direction of thearrows,

Fig. 6 is an ienlargedidetail view of the pulley .and belt arrangemen't tfor driving the saw and therp p,

.Fig. 7 is arsecticnal'v'iew taken along the line 7-1 of Fig. Ginthedirection of the arrows,

Fig. 8 is an enlarged sectional view taken. along :the line J8--B of Fig. )1 .in the direction of the arrows,

Fig. 9 .is .a sectional view taken along thelline 9-9 of Fig.3 in thedirection of the arrows, and

vFig. I0 is an enlarged sectional .viiew taken along. the line Ill-1.0 of Fig. .1 in the direction of thearrows.

Referring more vparticularly to the drawings, the .frame or standard of the saw comprises a :pair of front legs ..|-l,, a pair of rear )legs or uprights .llandahorizontalllbed l 3 which takes the .form of a tray or reservoir. Above the tray .is a .cutter head; this comprises .a deck or platform "I 4 having an electrical .motor v,l 5.mo1mted on the rear end thereof and an abrasive cutting disk 16 the .forward .end. 'Thecutter head 'is carried by .pins 11 extending laterally of the platform HI into oppositely disposed ones of thenotfihes liagprovidedin the rear uprights.

- To prevent the platform irom rocking about these .pins when .the saw is in use, a generally vertical .rod .I'B which is pivotally attached 'atits upper end to the rear of platform is -olamped.rigidlyat its zlower end lgy means of a pair of dogs (not shown) whichanez'controlled by the horizontal tube 21 andthe manual adjustment .knob :22. The grip of thetdogsionztherod IS'maybeilQosened by turning the :knob, whereby platform -l-4 then ,rmay be rocked about pin H to raise =01 lower the cutting :disk at will. 1

Wings rod 19 so ithatxa pin.may be threaded through one of the 9110165 ,24 in the :rod :and .rested "on the top surface of the wings to .iac'ilitate :trans- (fearing pivotgpins- I] ifmm 1a ziower-set :of matches :23 are provided *on'opp'osite sides of the idea to jet the it to a higher set, or vice versa. The apparatus and method for adjusting the height of the cutter head is described more in detail in my copending application, Serial No. 584,544, filed March 24, 1945, which issued as Patent No. 2,450,371, dated September 28, 1948, and forms no part of the present invention.

Mounted on the platform I4 between the motor and the cutting disk is a lubricant-circulating pump 26. It is driven by the motor through a narrow V-belt 2i mounted on the motor pulley 26 in the manner best seen in Figs. 6 and 7. A wider V-belt 29 aligned with the narrow belt 2! and operating directly over the narrow belt in a wider part of the motor pulley drives the cutting disk I t. A screen guard 30 secured to the platform covers both belts.

The pump draws lubricant from the reservoir I3 through an intake valve 33, which will be described in more detail presently, thence through the flexible hose 34 and discharges it through hose 35 into a manifold 36. Mounted on top of the guard 37! which covers the upper portion of the cutting disk, this manifold has a pair of tubes 38 extending obliquely downward inside the guard and terminating in small apertures through which the lubricant is jetted toward opposite faces of the disk or, more specifically, toward the hub plates 42 between which the disk is clamped. The tubes 38 are slidably supported in sleeve-like sheathes 40 which are welded or otherwise rigidly afiixed to the inner vertical walls of the guard 37 so that by merely removing the screws M which fasten the manifold to the guard the manifold and its attached tubes may be withdrawn from 40. Small screws 39 tubes are removable thereof.

Since the abrasive cutting disk rotates at high speed the lubricant jetted against the sides of the hub plates 42 is carried outwardly by centrifugal force, first over the curved marginal edge of the hub plates and then along the opposite the supporting sheathes provided in the ends of the to facilitate the cleaning faces of the disk in the form of a thin film until it reaches the periphery of the disk where the cutting occurs. In the past it has been the praclubricant directly against the roughened surface of the abrasive disk, but this is quite unsatisfactory because the strong air currents which are set up by the roughened sides intercept and otherwise interfere with the jet, spattering it over a wide area; also, great pump pressure is required in order to make the lubricant penetrate this zone of fast moving air and reach the surface of the disk. I have found that by directing the jets against the smooth surface of the plates 42 where these strong air currents do not exist, and permitting the lubricant to flow over the curved edges thereof onto the disk, less pump pressure is required, and an excellent distribution of fluid is obtained with substantially no spattering.

A trough 43 is removably attached to the forward edge of the guard by means of a U-shaped spring clip 44 having inturned ends which fit into registering holes in the trough and guard. This trough has inwardly projecting upturned edges which form a gutter between the guard and the sides of the cutting wheel for collecting excess lubricant and. draining it back through spout 43!; onto the wheel near the center thereof. Thus the excess fluid is recirculated to supplement the lubricant supplied by the jets.

Beneath the cutting wheel is a workpiece con-" veyor or carriage 45. This carriage has flanged wheels 46 operatin in roller bearings, which wheels roll upon the upper rim of the tray I3 and permit the carriage with the stone, brick or tile workpiece positioned thereon to be moved back and forth beneath the cutting wheel. The cutting wheel turns in the direction indicated by the arrows in Figs. 1 and 2, and lubricant thrown rearwardly from the lower edge thereof is drained back into the reservoir by a curtain and splash board (not shown) located between the rear uprights l2.

Turning now to Figs. 3, 4 and 5 the construction of the pump will be described in detail. It comprises a casing 25 having therein a vertical partition 4? on one side of which is a large chamber 48. Communicating with this chamber (which hereinafter will be referred to as the suction chamber) is the pump intake 49.

On the opposite side of the partition there is, at best seen in Figs. 4 and 5, a lower chamber housing the impeller 55 and an upper chamber 5| which hereinafter will be referred to as the pressure chamber. An aperture 52 (Fig. 5) connects the latter two chambers, and a removable cover 53 gives access to'them, this cover having near its bottom a plug 54 which is removable for the purpose of draining the pump, and having at the top a discharge port 55 which communicates with the pressure chamber.

The partition 41 has two openings therethrough, a small one (56) near the top and a larger one (5"?) which encircles the hub of the impeller 59. The impeller is rigidly secured to a shaft 58 having the pulley 59 aflixed to the other end thereof. This shaft is rotatably supported by a bearing 6! mounted in the pump casing as shown in Fig. 4, and it is encircled by a suitable fluid sealing ring 62.

An opening is provided in the top of the large chamber 48 so that the pump may be filled with lubricant like that in reservoir l3 when the masonry saw is originally placed in service. Filler cap 53 then is screwed into place in the opening and it ordinarily is unnecessary to again fill the pump in the course of normal usage, even though such use is intermittent, unless it is intentionally emptied.

In operation, the impeller is driven by motor 15 in the direction indicated by the arrow (Fig. 5) whereupon it draws fluid from the suction chamber 48 through aperture 5'! and expells it through aperture 52 into the pressure chamber 5!. Due to the suction thus created on the inlet side of the impeller chamber, fluid is drawn from the reservoir I3 through hose 34 and inlet port 49 into the suction chamber to replace that expelled into the pressure chamber. From the pressure chamber most of the fluid is driven through the outlet port 55, hose 35, manifiold 36, and tubes 38 from which it is jetted against the sides of the rotating hub plates; however, part of the fluid forced into the pressure chamber flows back into the suction chamber through aperture 56. This serves the important function of priming the pump at the beginning of its operation.

More specifically, in the brief period during which the impeller is accelerating from a standstill it is unable, because of its low speed and also because of the fact that a certain amount of air may be trapped in the hose 34, to draw suflicient liquid into the suction chamber from the reservoir I 3 to replace all that which leaves the suction chamber through orifice 51. Were the suction chamber to go dry the pump naturally would 35*.66 connected- -thereto-.-by a small orifice 61. :sm'all steel: ball turestsin ai-tapered socket at the be-i n danger'of bec6ming inop rative and accord the recirculation of iluid -frohi'the pressure hamper to' the' su'ction phainber is' importa'nt in vercoming zthis dangeri The re-circulation continues to a certain extent throughout:the operaar sideoftife wall oi the 'disk centralj portionithe expdsed "-face' of the 1 plate tion of the pump but at full speed the greatest part of the work done-bythe pump is useful, i. e., drawing fluidlinthroughportfili. and expelling it through port' 55.

spaced laterally ironi the exposed face of said plateymean's" for jetting 'a lubricant -throi1gh= said nozzle ontd-the -rotating huliplatez said hub-having a thin marginai eage contacting the rough and-having a thicker "-sinoothly from the central p'ortion=toe the -lubricanton the 'cen'triiugalaction over the thin l :.:=-Fi'g.=:l0;-'shows1in:detaihsthe constructioni'of the IB edge dr thi -p'late entctrieroughside wall' of the intake valve lubricant. from .the..-reservoir I 3. a. It. comprises a cylindrical shell'33 having a deep socket-like recess or lower chamber fil'vand an upper ehaimber :bottom of -theupperchamber-1, and spacedabove the balla'ishort.distance isaipifi 69 extending diametrically across the chamber :with'its' ends rigid y afi tmregisterineih in the p te: 2U"said-cutter:fluidbonnections for walls. A nipple" T0 is screwed into the upper chamber above the pinto permit the hosesnto' be connected thereto.

The valve 33 is maintained erect on the bottom of the tray l3 by means of a rigid stud 12 over which the recess or socket 65 fits. When the pump is operating fluid enters the lower chamber through the openings 13 covered by screen 14, flows upwardly through orifice 61, around the ball 68 (which now is carried upwardly against pin 69) and out into the hose 34 by 10. When the pump ceases to operate there is a tendency for the fluid standing in hose 34 to run back down into the reservoir IS. The ball 68 settles back into its tapered recess to prevent this, however, and thus the level of lubricant is maintained near the pump inlet port. This maintains the air trapped in the hose at a minimum, and hence reduces the tendency of the suction chamber to go dry when started.

The valve 33 also serves another useful purpose on those occasions when the pump is intentionally drained, for example in freezing weather. To refill the pump, the valve simply is supporting stud 12, turned end for end, and held above the pump; when supported thus it serves as a funnel through which lubricant may be poured so that it will 34 into the pump. After the pump has been filled, the valve is restored to its normal position on stud l2 and the same used as previously described.

From the foregoing it will be seen that my improved lubricating system and apparatus are well adapted to attain all of the ends and objects hereinbefore set forth together with other advantages which are obvious and which are inherent to the apparatus.

It will be understood that certain features and subcombinations are of utility and may be employed without reference to other features and subcombinations. This is contemplated by and is within the scope of the claims.

Inasmuch as many possible embodiments of the through whichxthe apump draws v -parallehtubsrigidly'connectedthereto, said tubes way of nipple the pump is again cant contained in the tray,

invention may be made without departing from 6 lane normal to the axis of disk.

' 2a A'masonrysaW-as'el'aimed in claim l" where- 'n saidmprinting A substantiallynormatto theplane ofthe cutter. f: 15 -disk l-ike cutter retatably mounted 3: A masonry s-aw comprising a cutter head, a on thehead, a guard carried by the head andsurroundingthe upper'part of thecutterfiafipair of'parallel sleeves rigidlf'afiixed to s'aidguard on opposite sides of jetting a lubriofthecutterf'said connections including amani'f'oldhaving a pairof said sleeves for support.

4. In a masonry saw, a rotating cutter disk, a tray below the disk, a lubricant for the disk contained in the tray, means including a. pump operative to draw lubricant from the tray and introduce it on the disk, said pump having a flexible intake line terminating in a funnel-like member normally occupying an inverted position with its mouth submerged in the lubricant contained in the tray.

5. In a masonry saw, a rotating cutter disk, a tray below the disk, a lubricant for the disk contained in the tray, means including a pump operative to draw lubricant from the tray and introduce it on the disk, said pump having an intake line whose inlet is submerged in the lubriand a check valve in the line substantially at said inlet for preventing the flow of lubricant away from the pump through said line.

6. In a masonry saw,

removably insertable in a rotating cutter disk, a

lifted from the 5 tray below the disk, a stud extending vertically upward from the bottom of the tray, lubricant for the disk contained in the tray, means including a pump operative to draw lubricant from the tray and introduce it on the disk, said pump having a flexible intake line terminated by a sleeve adapted to be positioned over said stud so it closely encircles same and is held upright thereby, and apertures in the sides of the sleeve above the stud for admitting the lubricant in the tray to the interior of the sleeve.

'7. In a masonry saw, a cutting disk and a motor each having a pulley, a pump having a pulley situated intermediate the motor pulley and the disk pulley, said three pulleys being disposed in a common plane and all having Vshaped belt tracks, a narrow V-belt linking the motor pulley and pump pulley, and a wider V-belt linking the motor pulley and the disk pulley.

8. In a masonry saw, an abrasive cutting disk, a relatively smooth circular hub plate engaging one side of the disk and covering the center portion of the rough side wall of said disk, the periphery of said disk being beveled so it meets said one side of the disk in an obtuse angle, means for rotating said disk and hub plate as a unit, and means spaced from the exposed face of the rotating hub plate for jetting fluid onto said face.

9. In a masonry saw, an abrasive cutting disk having rough side walls each disposed in a flat the disk, a smooth hub plate adjacent one side of the disk and covering the center portion of the rough side wall of the disk, means for IOtating the disk and ing hub plate, said hub plate having a thin marginal edge contacting the rough side Wall of the disk and having a thicker central portion, the

8 belt and linking the driving pulley with said other driven pulley.

11. A machine as in claim 10 wherein said one driven pulley is smaller in diameter than said 5 other driven pulley.

NELIGH CLAIR COATES. REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Number Name Date Furber July 4, 1916 Bieling et a1. Sept. 10, 1935 Jacobsen June 27, 1939 Pearson Aug. 26, 1941 Albertson Apr. 2, 1946 FOREIGN PATENTS Country Date Great Britain Apr. 12, 1940

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