US3042206A

US3042206A - Screen deck

Info

Publication number: US3042206A
Application number: US859801A
Authority: US
Inventors: Francis B Olender
Original assignee: Hewitt Robins Inc
Current assignee: Hewitt Robins Inc
Priority date: 1959-12-15
Filing date: 1959-12-15
Publication date: 1962-07-03
Anticipated expiration: 1979-07-03

Description

July 3, 1962 Filed Dec.

F. B. OLENDER SCREEN DECK 2 Sheets-Sheet 1 1 T -ETL.

INVENTOR #00675 3. o/e y /e ATTORNEYS F. B. 'OLENDER July 3, 1962 SCREEN DECK 2 Sheets-Sheet 2 Filed Dec. 15, 1959 a r V W R WW 0 0d e 35 m m )OW P. W .sYw/

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United States Patent ()fiice 3,042,266 Patented July 3, 1952 3,642,296 SQREEN DECK Francis E. @lender, Wellington, Ni. assignor to Hewitt- Robins Incorporated, New York, N.Y., a corporation of New York Filed Dec. 15, 1959, Ser. No. 859,801 11 (Ilaims. (Cl. 209-495) The present invention relates to vibrating screens and relates, more particularly, to a vibrating screen having a screen deck formed by removable rods which are resiliently mounted in spaced parallel relation to each other.

An object of the present invention is to provide a rod deck for a vibrating screen with resiliently mounted rods which can be readily removed for replacement without the use of special tools. In vibrating screens of this type, the rods which form the screen surface are subject to considerable wear from the materials being screened and it is highly desirable that worn rods can be replaced quickly and with a minimum of difliculty.

Another object of the present invention is to provide a rod deck for a vibrating screen in which the resilient mounting of the rods will serve to cushion the force of material striking the rods and thus, minimize breakage of the rods. A further object of the invention is to provide a resilient mounting for the rods which will permit a secondary vibration to take place in the rods which tends to clean the rods and thus, promotes greater efficiency in the screening operation.

Other objects and advantages of the invention will be apparent and more readily understood from the following description and the accompanying drawings in which:

FIG. 1 is a plan view, partially broken away, of a portion of a vibrating screen employing a rod deck embodying the present invention;

FIG. 2 is a section view taken along the line 22 of FIG. 1;

FIG. 3 is a perspective view illustrating a portion of the rod deck shown in FIG. 1;

FIG. 4 is a section view taken along line 44 of FIG. 1, but on an enlarged scale;

FIG. 5 is a section view taken along line 5-5 of FIG. 1, but on an enlarged scale;

FIG. 6 is a side view of a portion of a rod supporting member employed in the screen illustrated in FIG. 1, but on an enlarged scale;

FIG. 7 is a perspective view illustrating the rod supporting member and holder during assembly (or disassembly) thereof;

FIG. 8 is a section view taken along line '88 of PI G. 7;

FIG. 9 is a side view of a central rod engaging member employed in the screen illustrated in FIG. 1, but on an enlarged scale; and

FIG. 10 is a section view taken on line 10IG of FIG. 9.

Referring to the drawings in detail, there is an end section lit of a vibrating screen. Spaced vertical side plates 11 and 12 form the sides of the screen and

structural members

13, 14, and 15 which extend transversely across the screen between the side plates are located at opposite ends of the section and at the center thereof, respectively.

A series of spaced parallel rods 16 form the surface of the screen over and through which material passes. The rods extend lengthwise of the section with their ends terminating at the transverse

structural members

13 and 14. In operation of the screen, the material being screened is moved by vibration of the screen in the direction indicated by the arrow A and the material which does not pass through the screen progressively advances onto succeeding sections as operation of the screen continues.

As shown best in FIGS. 3-6, the ends of the rods are mounted in rod supporting members 17 which extend across the screen section at the ends thereof. Each of the rod supports 17 comprises an upper strip 18 of flexible material, such as rubber, which has spaced openings 19 formed in one side thereof. The flexibility of the strip permits it to be bent in a vertical plane as indicated in FIG. 7. The openings in the strip are shaped to receive the ends of the rods and the ends of the rods are readily removable therefrom.

Each of the rod supports is also provided with a series of spaced locking lugs 29 which extend downwardly from the bottom or lower surface thereof. Each of the locking lugs has a neck portion 21 which is connected to the bottom or" the flexible strip and which terminates in an enlarged head 22.

The locking lugs and the strip may be formed separately and be secured together or they may be readily molded as one piece from rubber or similar material. As noted above, the material from which the strip is formed must be flexible so that it can be readily bent and when it is made of rubber, a durometer of about 60 to is satisfactory. However, the locking lugs should be more rigid than the strip and when made of rubber, a durorneter of about to is satisfactory.

As shown best in FIGS. 4 and 5, the locking lugs on the rod spacing members fit into recesses 23 in

holders

24 and 25 which are mounted on the transverse

structural members

13 and 14, respectively, at the ends of the section. The recesses are shaped to receive the lugs and extend lengthwise of the holders with openings 26 thereto located on the upper surfaces of the holders.

The holders may be molded from rubber or they may be made of other suitable resilient material which will enable the sides of the recesses leading to the openings to be forced apart sufficiently to permit entry of the enlarged heads of the locking lugs into the recesses. The resilience of the holders also causes the sides of the recesses to engage with the neck portions of the locking lugs with a clamping action which will prevent the locking lugs from becoming unseated during operation of the screen. Thus, the width of restricted openings in the holders may be made slightly narrower than the thickness of the neck portions of the locking lugs. Under these conditions, the portions of the holder engaging with the neck portions of the locking lugs are under tension and a firm gripping action is obtained thereby.

When the holders are made of rubber or similar material, the lower or bottom surface thereof may be bonded to a metal plate 27 which is bolted to one of the transverse structural members. The holder shown in FIG. 5 (and at the right of FIGS. 1 and 2) has two recesses formed therein to receive rod supports for adjoining screen sections. In such a holder, the center of the holder may be relieved by an opening 28 to accommo- 3 date distortion or bulging of the sides of the holder dur ing insertion of the locking lugs of the rod supports into the recesses in the holder.

The holders are illustrated herein as being made of rubber or a similar material, but it will be understood that the holders may also be made of other resilient materials such as metal which has a spring action to permit insertion of the locking lugs therein and to clamp the rod spacing member in place. Holders made of rubber having a durometer of 80 have been found to provide a gripping action in excess of four times the normal forces acting to-disengage the rod spacing members from the holders in normal operation of the screen.

In addition to being supported at their ends, the rods forming the screen surface of the deck section may be flexed in an upwardly arched contour by a comb member 2% of rubber or similar material which extends transversely across the center of the screen section and engages with the bottoms of the rods. As shown best in FIGS. 7 and 8, the comb member has a series of spaced indentations 30 in the upper surface thereof in which the rods are seated. The comb member also has a pair of oppositely disposed legs 31 which extend downwardly on opposite sides of a bracket 32 and are secured thereto by bolts 33. The bracket 32 is mounted on top of the transverse structural member 7.5 at the center of the section so that the comb extends upwardly therefrom into engagement with the rods. The flexing of the rods in this manner causes the rod supports and the holders to assume positions which are slightly inclined with respect to the vertical.

The assembly of a pair of rod supports with rods extending therebetween with the holders is readily accomplished by placing the enlarged heads of the locking lugs on top of the openings to the recesses in the holders and then tapping the top of the strip with a mallet or hammer to force the lugs into place. Removal of rod spacing members and the rods carried thereby is easily accomplished by prying the locking lugs at one end of each of the rod supports free of the recesses in the holders. Thereafter the remaining lugs may be removed from the holders by bending the strip upwardly as shown in FIG. 7.

The fact that the locking lugs are spaced apart permits the flexible strip of the rod spacing member to be bent upwardly without difficulty to permit the locking lugs to be removed progressively from the recesses in the holders. When the rod spacing members and the rods are removed from the holders, the individual rods can be then removed from the rod supports and replaced as required.

In operation of the screen, the vibrating forces which act on the rod deck structure cause a secondary movement or vibration to take place between the rod supports and the holders due to the resilience of the material from which the holders are made and such secondary vibration tends to keep the rods clean.

It will be understand that various modifications and changes may be made in the embodiments of the invention illustrated and described herein without departing from the spirit or scope of the invention as defined by the following claims.

I claim:

1. In a rod deck for a vibrating screen, the improvement which comprises a pair of rod supporting members, each of said members including an elongated strlip of flexible material, said strips being bendable in a vertical plane and having spaced rod-receiving openings formed in a side face thereof, and a series of spaced lugs extending downwardly from each of the strips, said lugs having enlarged portions at their lower ends; and resilient holder means for releasably engaging with the lugs on the respective rod supporting members and positioning the rod supporting members in spaced relation with respect to each other.

2. In a rod deck for a vibrating screen, the improvement as defined in claim 1 wherein the holder means includes a pair of elongated members formed of resilient material, said holder members each having portions resiliently engaging with the lugs on one of the rod supporting members.

3. In a rod deck for a vibrating screen, the improvement as defined in claim 1 wherein the holder means includes a pair of elongated members formed of a resilient, rubber-like material, each of said holder members having a recess extending lengthwise thereof, said members being shaped to receive the lugs on the rod supporting members and having side portions resiliently engaging with said lugs on opposite sides thereof.

4. In a rod deck for a vibrating screen, the improvement as defined in claim 1 wherein the lugs on the rod supporting members are more rigid than the flexible strip.

5. 'In a rod deck for a vibrating screen, the improvement which comprises a rod supporting member, said member comprising an elongated strip of flexible material, said strip being bendable in a vertical plane and having spaced rod-receiving openings formed in a side face thereof and a series of spaced lugs extending downwardly from said strip, said lugs being more rigid than the strip and having enlarged portions at their lower ends, and an elongated holder, said holder having portions resiliently engaging with said lugs.

6. In a rod deck for a vibrating screen, the improvement which comprises an elongated strip of flexible material, said strip being bendable in a vertical plane and having spaced openings formed in a side face thereof, said openings being shaped to receive ends of a series of rods therein, a series of spaced lugs extending downwardly from the flexible strip, each of said lugs having an enlarged portion at its lower end and a neck portion con necting the enlarged portion to the strip, and a holder releasably engaging with said lugs, said holder having portions extending on opposite sides of the lugs and resiliently engaging therewith.

7. A rod deck assembly for a vibrating screen which comprises a pair of spaced rod supporting members, each of said members comprising an elongated strip of flexible material, said strips being bendable in a vertical plane and having spaced rod-receiving openings in side faces thereof, and a series of spaced lugs extending downwardly from each of said strips, each of said lugs having an enlarged portion at its lower end; a series of spaced parallel rods extending between the strips with the ends of said rods being removably mounted in the open-ings in the side faces of the strips; and a pair of spaced holders releasably engaging with the lugs on the strips and holding the strips in spaced relation with respect to each other, said holders having portions extending on opposite sides of the lugs and resiliently engaging therewith.

8. A rod deck assembly for a vibrating screen as defined in claim 7 wherein the elongated strips are formed from a rubber-like material and the lugs are formed from a material which is more rigid than the strip.

9. A rod deck assembly for a vibrating screen as defined in claim 7 wherein the holders are molded from a rubber-like material with a recess shaped to accommodate the lugs extending lengthwise thereof.

10. A rod deck assembly for a vibrating screen as defined claim 7 which includes a comb member located beneath the rods at a point between the rod supporting members, said comb member engaging with and holding the rods in an arched contour.

11. In a rod deck for a vibrating screen, the improvement which comprises a pair of spaced rod supporting members, each of said members including an elongated strip of rubber-like material, said strips being bendable in a vertical plane and having spaced openings formed in opposing sides thereof, said openings being shaped to permit the insertion of rod ends therein and the removal of said rod ends therefrom, and a series of spaced 6 lugs extending downwardly from each of said strips, References Cited in the file of this patent said lugs having enlarged portions at their lower ends UNITED STATES PATENTS and neck POIUOIIS connecting the enlarged portions to the strip; and means for releasably clamping the rod 1,427,031 Step9 22, 1922 supporting members in spaced relation with respect to 5 24721551 symons Sept 1939 each other, said means including a pair of holders formed 2,204,928 culvfar June 18, 1940 from a rubber-like material with recesses extending 2,716,787 Hams P 1955 lengthwise thereof, said recesses being shaped to receive 218991256 Kelley 11, 1959 the lugs on the respective rod supporting members with 2,910,180 Parks 1 1959 the sides of said recesses resiliently engaging with said 10 2,914,177 Parks 24, 1959 lugs.