US2819796A - edwards - Google Patents

Description

Jan. 14, 1958 F. H. EDWARDS MICRO-VIBRATING SCREEN 3 Sheets-Sheet 1 Filed Feb. 4, 1954 INVENTOR.

IIIIIIIIIII I iiiliitw HTTORNEY Jan. 14, 1958 FQ H. EDWARDS 1 MICROVIBRATING SCREEN Filed Feb. 4, 1954 s ShetsSheet 2 IN VEN TOR.

FEEDER/CK [ow/ mus HTTORNEY Jan. 14, 1958 F. H. EDWARDS 2,8 9,7 6

MICRO-VIBRATING SCREEN Filed Feb. 4, 1 954 3 Sheets-Sheet 3 INVENTOR.

FEEDER/0K h E0 WFIRDS HTTOR/VEY nited States MICRO-VIBRATING SCREEN Frederick H. Edwards,Meriden, Conn.

Application February 4, 1954, Serial No. 408,232

1 Claim. (Cl. 209-319) This invention relates to screening'devicesand'more particularly to a power-driven micro-adjustable multiple screen for separating or sizing broken stone, minerals, sand, gravel or any finely divided material for commercial or laboratory use.

One object of this invention is to provide a vibratory screen of the above nature in which one end of the screen is continuously rotated in a circular path by means of a pair of eccentric sections formed integral with'a powerdriven shaft, the other end of said screen being supported by a pair of downwardly extending resilient leaf springs.

A further object is to provide a screening device of the above nature which will eliminate the difficulty known in the trade as blinding or clogging, permitting the free passage of the powdered material through the cloth screens at all points.

A further object is to provide a screening device of the above nature having improved means for varying the motion of the discharge end of the screen to control the speed of flow of the materials undergoing sizing.

A further object is to provide a vibrating screen of the above nature in which the circular motion at the receiving end of the screen will be constant, and in which the angular position of the leaf springs which support the discharge end of the screen may be adjusted to cause the motion of the screen at this point to be controlled.

A further object is to provide a screen of the above nature which will be simple in construction, inexpensive to manufacture, easy to install and manipulate, compact, ornamental in appearance, and very efficient and durable in use.

With these and other objects in view, there has been illustrated on the accompanying drawings, one form in which the invention may conveniently be embodied in practice.

In the drawings,

Fig. 1 represents a top plan view of the improved screening apparatus.

Fig. 2 is a side elevational view of the same.

Fig. 3 is a cross-sectional view, on a larger scale, taken on the broken line 33 of Fig. 2, looking in the direction of the arrows.

Fig. 4 is a fragmentary cross-sectional view taken along the line 44 of Fig. 1.

Fig. 5 is a diagrammatic view showing the motions of the front and rear ends of the screen, with the leaf springs in the position shown in Fig. 2; said motions being circular and semi-elliptical respectively.

Fig. 6 is a similar diagrammatic view showing the motions of the front and rear ends of the screen in another adjusted position in which the mid-positions of the leaf springs at the rear end of the screen are vertical.

In carrying out the present invention, a conventional multiple screen body and frame may be used, in which a cross shaft having two integral eccentric sections is provided at the material-receiving or front end. This shaft is mounted to rotate within a pair of ball bearings, and a 2,819,796 Patented Jan. 14, 1958 2; pair of counter-balanced fiywh'eels are I mounted on i the ends of "the shaft, which is driven-by a pulley attached to a motor or other source of power.

On the"-discha'rge or rear end of the 'screen provision is made of a pair of "upstanding leafsprings which are adjustably anchored at theiruppcr'ends to the screen body and adjustably anchored at their lower ends in a pairof curved slots in the' base ofthe machinethe angleof adjustment bein'g indicated on a graduated circular quadrantso ale.

It is who understood that by adjusting the position of the lower ends of the" leaf spring; -any"-desired vibratory motion of the dischargeendof-the'screen may be obtained, according to the particular sizing and rated flow of the powdered material, required;

Referring now to the drawings in which like refer'ence numerals denote corresponding parts throughout the several views, the letter 'B indicates' '-the'=body of the screen, which-"is movablymounte'dupon a pair of longitudinal basechannels lll -and 11.

Thecha'nnels 10 an'd-11- rest upon a pair of bottom lateral I-beams IZQand 13' extending at right angles'to the screen body'l0."

A pair of cyl-indric'al pil- low block bearings 14 and 15 are carr'iedby the topsof the channels 10 and 11 for receivin'g'a horizontal drive shaft I65" Tlie scree'n body B is s'up'porte'd at itsmaterial-receiving front end by a pair of eccentric sections 17 and 18, integral with the shaft 16, and located within a pair of ball bearings 19 and 20, which are embraced by a pair of flanged housings 21, 22.

Provision is also made of ball bearings 23, 24 located between the cylindrical bearings 14, 15 and the shaft 16.

The shaft 16 is adapted to be driven by means of a pulley 25, and said shaft is also provided with flywheels 26, 27 having adjustable counterweights C at the inner ends thereof. The flywheels 26, 27 are secured rigidly upon the shaft 16 by keys 28, 29 as clearly shown in Fig. 3. The counter-weights C are held in adjusted position by means of bolts 27a, located in slots 27b, said bolts 27a having nuts 27c thereon.

The screen body B is adapted to be supported at its discharge or rear end by means of a pair of L- shaped anchor plates 30, 31.

Provision is also made of headed machine bolts 32, 33 and nuts 34, 35 to provide a pivotal connection between said plates 30, 31 and a pair of downwardly extending leaf springs 36, 37. Locking dowel pins 37a, 38a are also selectively received in a series of holes 38b in the body B. If desired similar dowel pins may be employed at the bottom of the leaf spring anchors.

The plates 30, 31 are secured to the springs 36, 37 by rivets 38, 39.

The multiple screen body is herein shown as supporting f our cloth screens 40, 41, 42, 43 of graduated mesh, by means of a plurality of sets of longitudinal angle clips 44, 45, 46, 47, 48, 49, 50, 51 respectively, said clips being held in place by bolts 52 and nuts 52a.

The screen body B is also provided with a plurality of sets of transverse angle bars 54, 55, 56, 57 underlying the screens 40, 41, 42, 43, which bars are preferably welded to longitudinal side angle members 53 as shown. The center portions of the screens are provided with longitudinal supporting bars 58, 59, 60, 61 welded to said cro'ss bars 54, 55, 56, 57 respectively, as shown.

At the receiving end of the screen body B, provision is made of a body end plate 62 which slopes downwardly, as shown in Fig. 2.

In order to carry away the material passing from the discharge end of the screens 40, 41, 42, 43, provision is made of a plurality of downwardly inclined chutes 63, 64, 65, 66.

Operation The leaf springs 36, 37 will first be adjusted to the desired angular positions by means of a pair of bolts 67 (Fig. 2) which are slidably located in the curved opposed slots 68 in the channels 10, 11said slots having quadrant scales 69 graduated from zero at the central bottom position, to 50 degrees at both upper ends thereof.

When the leaf springs 36, 37 are in the vertical posi- I tions shown in Fig. 6, the vertical vibration of the discharge end of the screens will be at the minimum, retarding the speed of travel of the material, while if the leaf springs are swung away from this central position, the motion of the material along the screens will be increased.

It will thus be seen that the travel of the material along the screens may be speeded up or slowed down depending upon the angular adjustment of the lower ends of the leaf springs 36, 37.

It has been found in practice that the eccentric rapid motion of the shaft at the receiving end of the screen, in combination with the arcuate elliptical vibration of the discharge end of said screen, will substantially prevent the screen openings from becoming blinded or clogged, thus greatly increasing the efliciency of the screening process.

While there has been disclosed in this specification, one form in which the invention may be embodied in practice, it is to be understood that this form is shown for the purpose of illustration only and that the invention is not to be limited to the specific disclosure, but may be modified and embodied in various other forms without departing from its spirit. In short, the invention includes all the 4 modifications and embodiments coming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new and for which it is desired to secure Letters Patent is:

In a vibratory apparatus for screening finely divided materials, a base, a screen body mounted on said base and having receiving and discharging ends, power means mounted on said base for imparting a continuous translatory motion in a circular path to the receiving end of said screen body, a pair of downwardly extending resilient leaf springs connected attheir upper ends to the discharge end of said body, whereby said discharge end will be oscillated in a controlled arcuate path, said base being provided with a pair of vertical side walls having aligned upwardly concave arcuate graduated slots, the lower ends of said leaf springs being detachably locked in adjusted position by a pair of elongated horizontal bolts passing through said slots and a pair of nuts.

References Cited in the file of this patent UNITED STATES PATENTS 1,005,900 Stromborg Oct. 17, 1911 1,971,156 Hallenbeck Aug. 21, 1934 2,053,341 Kennedy Sept. 8, 1936 2,178,813 Shaler l Nov. 7, 1939 2,225,909 Gruender Dec. 24, 1940 FOREIGN PATENTS 668,069 Germany Nov. 25, 1938

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