US2268853A

US2268853A - Screen stretching and take-up device

Info

Publication number: US2268853A
Application number: US307175A
Authority: US
Inventors: George W Behnke
Original assignee: Simplicity Engineering Inc
Current assignee: Simplicity Engineering Inc
Priority date: 1939-12-01
Filing date: 1939-12-01
Publication date: 1942-01-06
Anticipated expiration: 1959-01-06

Description

Jan. 6, 1942. G. w. BEHNKE 2,268,853

SCREEN STRETCHING AND TAKE-UP DEVICE Filed Dec. 1, 1939 Patented Jan. 6, 1942 SCREENST-RETOHING AND DEVICE I I George W. Behnke, Durand,.Mich., :assignor to.

Simplicity Engineering Company,

Mich.

Durand;

ApplicationxDecembcr 1, 1939, .SerialINo.307175 3.Claims. 7 (Cl. 209-403) This invention relates to gyrating screws-for screening sand, gravel, and other materials of a fragmentary classification, and more particularly to a means for stretching and providing forincreased tension as desired.

One of the prime objects of the invention is to provide a screen take-up including resilient means for exerting a continuous tension on the screen at all times.

Another object is to provide a screen take-up means which can be adjusted to take up slack or wear, which is so located as to protect it from the abrasive action of the material flowing over the screen, and which eliminates dead screening areas and pockets caused by loosely mounted or slack screens.

A further object is to provide a screen take-up assembly of simple, practical, substantial, and economical construction, which can be quickly and easily manufactured and applied, and which facilitates the quick and easy removal or application of the screen to the screen frame.

With the above and other objects in view, the present invention consists in the combination and arrangement of parts, hereinafter more fully described, illustrated in the accompanying drawing, and more particularly pointed out in the appended claims, it being understood that changes may be made in the form, size, proportion, and minor details of construction, without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawing: 1

Fig. l is a fragmentary, part sectional, side elevational view showing the discharge end of a gyratory screen illustrating my take-up in position, the broken lines illustrating the stretching of the screen.

Fig. 2 is a fragmentary top plan view thereof.

Fig. 3 is also a fragmentary top plan View showing the main body or portion of the screen.

Referring now to the drawing in which I have shown the preferred embodiment of my invention, the numeral 8 indicates a conventional screen such as used for screening sand, gravel, and other fragmentary materials of a similar classification. This is mounted and stretched over a screen frame 9 having screen take-up side brackets H] on the outside of the side plates and a take-up rail II is provided on the inside of the frame as shown, bolts I2 being provided for tightening the screen transversely of the frame in the usual manner.

The conventional method for securing the discharge end of the screen is to provide a plurality hook-shapedmember whichare inserted through 3 member for securing it in position.

Insuch construction-the material being processed flows over the face of the screen and over the entire assembly which makes up this fastenfing means, and in a relatively short time, the

abrasive action of the material being screened, wears it so that frequent replacements are necessary, furthermore such assembly has no automatic take-up or stretching properties.

In the instant construction, an end angle B is provided as shown and forms a part of the frame, being secured in position in any approved manner, and a screen end bar 14 is mounted thereon, suitable openings l5 being provided in said bar in spaced relation and accommodate take-up bolts [6 which extend through slotted openings l1 provided in the horizontally disposed leg l8 of the angle B.

An imperforate plate member l9 forms an extension of the screen frame, the leg 2|] being disposed in facial contact with the angle B as shown. The bolts l6 are bent as clearly shown in Fig. 1 of the drawing, the threaded ends projecting through openings 2| provided in the vertically disposed'legs 20 and 22 of the members B and [9 respectively, and a nut and

washer

23 and 24 respectively, are provided on the threaded end of the take-up bolt, a coil spring 25 being interposed between the leg 20 and the washer 24 so that a tension or stretching action is provided on the screen at all times, and this can be regulated by adjusting the nut 23 to provide for increased tension as required.

The imperforate deck extension lip or plate l9 forms an extension or continuation of the screen body and the material flows thereover so that the spring nut and bolt are protected from the product being processed.

The assembly is simple, sturdy, and economical, it provides a stretching means and a take-up, so that the screen is properly stretched at all times, the tension can be adjusted as desired and necessary to produce the best results commensurate with the product being processed, and it also provides for quick and easy mounting or detachment of the screen proper.

From the foregoing description, it will be obvious that I have perfected a very simple and practical screen take-up and stretching means which exerts a tension on the screen at all times.

What I claim is:

1. In a screening-device of the character described, the combination of a frame including spaced side and upper and lower end members, a woven Wire screen disposed between and secured to said side members and to the upper end member, slotted openings in the horizontal face of the lower end member, and downwardly curved bolt members anchored in the discharge end of the screen and extending through said slotted open ings with the threaded ends projecting forwardly beyond the end of the screen, means associated with said bolt for exerting continuous longitudinal tension on said screen, and an imperforate lip projecting over said means and forming an extension of said screen frame.

2. In a screening device of the class described, the combination of a frame including end and side members, a screen secured to said side members and the upper end of the frame respectively, a bar connecting the side members at the discharge end of the frame, slotted openings in the horizontal face of the bar, curved take-up bolts anchored in the discharge end of the screen and extending through said slotted openings, with the threaded ends projecting forwardly beyond the end of the screen, adjustable means on the end of the bolts, resilient means interposed between the adjustable means and the screen frame to provide a constant tension on said screen, and an imperforate lip projecting over said resilient means and forming an extension of said screen frame.

3. In a screening device of the character described, the combination of a frame, a Woven wire screen disposed over said frame and rigidly secured to the sides and the upper, end thereof, longitudinally slotted openings in the lower discharge end of the frame, curved anchor bolt assemblies anchored to one end of the screen and extending through said slotted openings with the free ends curved to extend substantially at right angles and projecting through the end wall of the frame, adjustable means on the threaded ends of the bolts, springs interposed between said adjustable means and said frame to provide a constant tension on the screen in a longitudinal direction, and an imperforate lip forming an extension of the screen and a shield for said assembly.

GEORGE W. BEHNKE.