US1711548A - Fastening device for screening apparatus - Google Patents

Description

May 7, 1929. L. E. sbL AN 4 FASTENING DEVICE FOR SCREENING APPARATUS Fil d'qul zs, 1927 2 Sheets-Sheet 1 \1 ki- \n: h Ill/$1M Q May 7, 1929. L. E. SOLDAN 1,711,

FASTENING DEVICE IIIOR SCREENING APPARATUS Fil ed July 29, 1927 2 Shets-Sheet 2 i6 f 7/ A Patented May 7. 1929.

"UNITED, STATES P TENT. oF icE.

LEWIS E. SOLDAN, OF BUFFALO, NEW'YORK, ASSIGNOR TO PRO'BUCTIVE EQUIP'l/I'Filll'i CORPORATION, 'OF CHICAGO, ILLINOIS, A. CORPORATION OF ILLINOIS.

FASTENING DEVICE FOR SCREENING APPARATUS.

Thisinvention relates to a screen mounting.

very rapidly owing to the abrasion of the gritty material which isoperated upon and this necessitates frequent renewal ,of the screen. The means heretofore employed for replacing a worn screen with a new one were expensive in construction, difficult tooperate and required considerable time :for ejecting 'the change in screens, which is objectionable on account of loss in out-put when the machine is idle which added to the requirement of special forms of screens, made the cost of screening such materials unduly high.

It is, therefore the object of this invention to provide a screen mounting which permits of takingordinary stock screening and readily shaping the same for use and providing fastening means whereby the screen can be eX- peditiously replaced with ease and with no appreciable loss of time.

In the accompanying drawings Fig. 1 is a side elevation of a sifting machine equipped with my improved screen mounting.

Fig. 2 is a cross section taken on line 2--2 Fig. 1.' p

Fig. 3 is a fragmentary top plan view of the sifting machine.

Figs. 1 and 5 are fragmentary vertical. longitudinal section taken on the era-respondingly numbered lines of Fig. 2.

Fig. 6 is a fragmentary vertical cross section, on an enlarged scale taken on line 66 of Fig. 1.

Fig. 7 is a horizontal section taken on line 77 of Fig. 6.

Fig. 8 is a fragmentary vertical transverse section on an enlarged scale, taken on line 88, Fig. 3. r

Fig. 9 is a fragmentary top plan View on an enlarged scale of the sifting machine showing one of the tightening devices.

Similar characters of reference indicate like parts in the several figures of the drawings.

The shaking body or shoe of the sifting machine may be of any suitable construction and in the present instance comprises two upright longitudinal side walls 10, and trans verse end walls 11 connecting the ends of the side walls.

vThe shoe may be shaken reciprocated or oscillated by various means well known in the trade and no particular means have therefore been shown for accomplishing this function.

it-11in the shoe are arranged the means for detachably inountingthe screen whereby the separating effect is produced. This screen is'constructed of a fiat sheet of foraminous material such as woven wire or perforated sheet metal which is of the desired dimensions to substantially conform to the space within the shoe, and this sheet is bent so as to form a flat body 12, and two longitudinal flanges 13 projecting downwardly from the opposite edges of the sheet.

At suitable intervals cross pieces extend across the space within the shoe each of which cross pieces preferably consists of two parallelbars 15 arranged with a narrow space be tween them and secured at their opposite ends to the inner sides of the-sidewalls of the shoe. On top of these cross pieces and adjacent to the side walls of the shoe are arranged two longitudinal supporting bars 14: which are spaced from these walls. The screen is placed within the shoe with the longitudinal edge portions of its body resting on the supporting bars 14 and its depending flanges 13 engaging with the outer sides of these bars, as shown in Figs. 2 and 8.

Means are provided for fastening the 1011 gitudinal edge portions of the screen to the supporting bars which means are preferably constructed as follows Arranged lengthwise of the longitudinal edge portions of the screen are two clamping bars each of which is provided with an upper horizontal flange 16 engaging with the upper side of one of the longitudinal edges of the screen body and a lower flange 17 projecting downwardly from the outer edge of the upper flange and bearing against the outer side of the adjacent longitudinal flange of the screen.

Each of these clamping bars is pressed at intervals against the corner formed at each end of the screens between its body and flanges so as to grip this part of the screenhe- I tween the clamping bar and the respective supporting bar. In its preferred form this clamping device consists of a plurality of clamping screws 18 arranged at intervals along opposite sides of the shoe and each screw inclining inwardly and projecting through an opening 19 in the adjacent wall of I the shoe and bearing at its lower inner end against the outer corner of the respective clamping bar and provided at its upper outer end with a handle or wheel 20. The external screw thread of each clamping screw works in the internally screw threaded opening of a nut 21 arranged at the top of ahollow bracket 23 secured to the outer side of the shoe side wall around the adjacent opening 19. After this clamping screw has been tightened, loosening of the same, due to vibration of the shoe is prevented by a detent consisting of a spring 24 secured to the side wall and engaging with one of a series of notches 25 arranged in an annular row on the periphery of the handle 20. To prevent the inner end of the clamping screws from slipping off the clamping bar, a retaining lip 26 is secured to the vertical flange of the clamping bar in position to engage this outer side of the screen at the lower end thereof, as best shown in Fig. 8.

To prevent the material which is being sifted from passing downwardly between the longitudinal edges of the screen and the side walls of the shoe a closure provided which preferably consists of an inclined guide plate 27 extending upwardly and outwardly from the inner edge of the upper flange of each clamping bar, and a flexible curtain 28 of rubber or other suitable materia secured at its lower edge to the upper inner side of the guide plate and bearing with its upper edge against the inner side of the adjacent shoe wall. This closure not only prevents the material from escaping between the screen and the shoe but also directs all the material to the upper side of the screen so that the same is subjected to separating action of the same, and pern'lits the use of screening material of varying thickness. Y

Upon releasing the pressure of the clamping screws against the clamping bars the latter are automatically raised by means consisting preferably of springs 29 each of which has the form of a strip extending through one of the openings 19 and is secured at its inner end to the guide plate of the respective clamping bar while its outer end is secured to the adjacent bracket 23, as shown in Figs. 2, 8 and 9. When the clamping bars have'been thus released and ele ated from the longitudinal edge portions of the screen, the latter can be easily withdrawn. lengthwise froin the shoe and its supports for inspection and repairing and if desired another new screen or one of a different size mesh may be substituted therefor and so: cured in place, which operation can be effected very quickly and readily and thereby reduce interruption of the operation to a minimum. After the screen has been clamped at its opposite longitudinal edges to the shoe the same is deflected upwardly between its longitudinal edges for the purpose of making the screen taut and enabling the material to flow freely over the same. The improved means for the purpose shown in the drawings are constructed as follows The numeral 30 represents two tightening bars arranged lengthwise between the underside oft-he body of the screen and the upper side of the cross pieces and each provided on its upper side with a facing 31 of rubber or similar elastic material forming a cushion whereby this tightening bar engages the screen. These tightening bars are raised and lowered for putting the body of the screen under tension preparatory to using the same or slackening the same preparatory toremoval by means which preferably comprise a plurality of elbow levers 32 each of which is arranged between the two bars of one of the cross pieces and pivoted thereto by a pin 83 so as to swing vertically, a link 3% connecting the upper arm of each elbow lever with the adjacent part of one of the tightening bars, a shifting rod 35 extending from the lower arm of each elbow lever outwardly, an adjusting head 36 having a screw connection with the outer end of the shifting rod and guided in the adjacent wall of the shaking shoe, and a cam 37 pivoted on the outer end of the head and engaging the outer side of the respective shoe wall. Upon turning each of the cams so that the low part of its face is arranged next to the shoe wall then the outward pull on the rod 35 is relaxed and the corresponding tightening bars are released and permitted to drop by gravity and thus loosen the tension on screen which movement of the tightening bars is aided by lowering means consisting preferably of leaf springs 38 each secured at one end to the underside of the adjacent tightening bar while its opposite end is secured to the adjacent cross piece shown in Figs. 2, 3, and 5. Upon turning each of the cams so that the salient part of its face engages the shoe wall then the pull on the rod 35 causes the elbow levers to be turned in the direction for elevating the tightening bars and raising the body of the screen so that the same is taut and ready for use. The turning of each cam is preferably effected by a handle or lever 39 projecting laterally therefrom and adapted in its tightened position to engage the outer side of the adjacent shoe wall. as shown in Figs. 1, 2, and 6. In order to prevent this cam from becoming loose while the screen is in operation means are provided for locking the same in its operative position, for example, a turn button 40 pivoted on the shoe 'wall and adapted to project through a slot 41. in the hand lever 39 and to engage with the outer side of the same.

By turning the head 36 on the shifting rod 35 these parts may be'adjusted relative to each other tosecure the desired tension on the screen.

I claim as my invention 1. A sifting apparatus comprising a shaking shoe provided with supports, a screen havinga body engaging the top of said supports and flanges engaging with the sides thereof, and clamping means for holding said screen in engagement with said supports, including clamping bars each having a horizontal and a vertical flange engaging with the top of said body and the outer side of the flan e oi the screen, clamping screws inclined relative to the screen body and mounted on said shoe and engaging with said clamping bars, and brackets mounted on said shoe and having nuts which receive said screws.

2. Asifting apparatus comprising a shakingshoe provided with supports, a screen having a body engaging the upper sides of said supports and flanges engaging with the lateral sides thereof, and clamping means for holding said screen in engagement with said supports, including clamping bars each having a horizontal and a vertical flange engaging with the top of said body and the outer side of the flange on the screen, clamping screws mounted on said shoe and engaging with said clamping bars, and retaining lips arranged on. said bars and engaging with said screws.

3. A sifting apparatus comprising a shaking shoe having side walls and supports adj acent tothe inner sides otsaid walls, a screen having a body resting on top of said supports and longitudinal flanges projecting downwardly from said body and engaging the outer sides of said supports, clamping means com iirising bars having horizontal and vertical flanges engaging the top of said body and the side of the flange on. said body, inclined guide plates projecting upwardly and outwardly from the horizontal flanges of said clamping bars and flexible curtains extending across the space between said guide plates and said side walls.

4. A sifting apparatus comprising a shaking shoe having side walls and supports adjacent to the inner sides of said walls, a screen having a body resting on top of said supports and longitudinal flanges projecting downwardly from said body and engaging the outer sides of said supports, clamping means comprising bars having horizontal and vertical flanges engaging the top or" said body and the side of the flange on said body, inclined guide plates projecting upwardly and outwardly from the horizontal flanges of said clamping bars, and flexible curtains secured to the upper ends of said guide plates and engaging theirv upper ends with the inner sides of the walls of said shoe.

5: A sifting apparatus comprising a shaking shoe having side walls and supports adj acent to the inner sides of said walls, a screen having a body resting on top of said supports and. longitudinal flanges projecting downwardly from said bodyand engaging the outer sides of said supports, clamping means comprising bars having horizontal and vertical flanges engaging the top of said body and the side of the flange on said body, and means tending to raise said bars when the and the side of the flange on said body, in

clined guide plates projecting upwardly and outwardly from the horizontal flanges of said clamping bars, screws mounted on said shoe and engaging said bar for holding them, and springs tending to raise said bars and connected at one end with said guide plates and mounted at the opposite ends on said shoe. y I 7. A sifting apparatus comprising a shaking shoe, a screen secured to said shoe at its edges, and means for deflecting said screen between its edges for tightening the same comprising tightening bars adapted to engage with the underside of said screen, elbow levers mounted on the shoe. and connectedwith the tightening bars, and means for shifting said elbow levers.

8. A sifting apparatus comprising a shaking shoe, a screen secured to said shoe at its edges, and means for deflecting said screen between its edges for tightening the same comprising tightening bars adapted to engage with the underside of said screen, elbow levers mounted on the shoe and connected with the tightening bars, and means for shifting said. elbow levers comprising a shifting rod connected with each elbow lever, and a cam pivotally connected with each rod and adapted to engage said shoe.

9. A sifting apparatus comprising a shaking shoe, a screen secured to said shoe at its edges, and means for deflecting said screen between its edges for tightening the same comprising tightening bars adapted to engage with the underside of said screen elbow levers mounted on the shoe and connected with the tightening bars, means for shifting said elbow levers, and springs for depressing said tightening bars.

10. A sifting apparatus comprising a shaking shoe, a screen secured to said shoe at its edges, and means for deflecting said screen between its edges for tightening the same comprising tightening bars adapted to engage with the underside of said screen, elbow levers mounted on the shoe and connected with the tightening bars, and means for shifting said elbow levers comprising a shifting rod connected Witheach elbow lever, a cam pivotally connected with'each rod and adapt- 7 ed to engage said shoe, and means for holding said cam against turning.

11. A sifting apparatus comprising a shaking shoe, a screen secured to said shoe at its edges, and means for deflecting said screen between its edges for tightening the same comprising tightening bars adapted to en gage with the underside of said screen, elbow ed to engage said shoe. a handle connected with said cam and having a slot, and a turn button pivoted on the shoe and adapted to pass through said slot of the handle and bear against the outer side of thesanie.

:12. A sitting apparatus comprising a shaking shoe provided with a support having a horizontal top and a vertical outer side; a

screen having a horizontal body engaging with the horizontal top of said support and a depending vertical flange engaging with the vertical side of said support; a-clamping her having a horizontal flange engaging with the top of said screen body anda vertical flange engaging with said screen flange; and an inclined clamping screw, arranged at an angle to the screen body and mounted on said shoe and engaging with said clamping bar,

In testimony whereof I aflix my signature.

LEWIS E. SOLD AN.

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