US2865210A

US2865210A - Shaker drive

Info

Publication number: US2865210A
Application number: US606846A
Authority: US
Inventors: Fisher Chester Donald
Original assignee: Sprout Waldron and Co Inc
Current assignee: Sprout Waldron and Co Inc
Priority date: 1956-08-29
Filing date: 1956-08-29
Publication date: 1958-12-23
Anticipated expiration: 1975-12-23

Description

Dec. 23,- 1958 v c. D. FISHER KSHAKER DRivE Filed Aug. 29, 195e M M II Ln n.l f n M/ M r .IV HF! ,...4 -LBIIL fa .b

United States Patent O f 2,865,216 SHAKER DRIVE Chester Donald Fisher, Muncy, Pa., assignor to Sprout, Waldron & Company, Inc., Muucy, Pa., a corporation of Pennsylvania Application August 29, 1956, Serial No. 606,846

8 Claims. (Cl. 74-61) This invention relates to an oscillating shaker drive for imparting oscillating or vibrating motion to a shaker or like device and, more particularly, to an eccentric shaker drive adapted to impart vibrational or oscillating force in one plane without substantial vibration components in other planes.

f Apparatus such as shakers of various sorts, sieves, screens for separating solid materials according to particle size, sluice boxes and the like are conventionally equipped with a drive mechanism which will Shake them or vibrate them to increase or control or enhance the flow of material therethrough. As such apparatus to be vibrated increases in size, however, it may be found that applying a conventional electrical vibrator or a conventional mechanical vibrating drive, such as a shaft with eccentric weights thereon, may produce objectionable components of vibration in the whole apparatus in addition to the desired shaking or vibrating of the desired portion of the apparatus.

Thus, considering a substantially flat screen or sieve which it is desired to vibrate predominately in a horizontal plane, the application thereto of conventional eccentric-type vibrating or oscillating rams or drives may also produce substantial vertical vibrational components in addition to the desired horizontal oscillation, and such vertical vibrating components may be objectionable and are wasteful.

According to this invention, however, a rotating vibrating drive is provided having two counter-rotating eccentrically weighted pulleys which produce the desired oscillating or vibrating movement but are so constructed and timed that substantially all the oscillating or vibrating force is applied in only one plane with only minor, if any, moments of force or vibration effects being generated by the drive in other planes.

One object of this invention is to provide a vibratory motion drive mechanism of the character described in which substantially all of the drive force is generated in but one plane and having two coaxial counter-rotating eccentrically weighted pulleys driven with a positive timing belt.

Another object of this invention is to provide a drive of the character described in which two eccentrically Weighted counter-rotated pulleys are mounted on a common shaft and are po-sitively driven in timed relation with each other to effect continuously controlled positioning of the eccentric weights thereon with respect to each other.

A further object of this invention is to provide a drive of the character described which may be beltdriven and open for accessibility and which 'is free of gear train drives or the necessity of being enclosed in an oil tight casing.

Other objects and advantages of this invention will be apparent from the following description, the accompanying drawing, and the appended claims.

In the drawing- Fig. 1 is a plan view of a vibratory motion drive em- 2,865,210 Patented Dec. 23, 1958 ICC bodying this invention as applied to a classifying screen device for solid particles;

Fig. 2 is a plan end view of the device illustrated in Fig. 1;

Fig. 3 is a diagrammatic view showing various positions of the eccentric weights during the operation of a device embodying this invention;

Fig. 4 is a transverse section through a device embodying the invention along the line 4-4 of Fig. l; and

Fig. 5 is a fragmentary section along the line 5 5 of Fig. 4.

Referring to the drawing, in which like characters of reference refer to like parts throughout the several views thereof, a classifying screen for classifying solid particles according to size is fragmentarily illustrated at 10 at being flexibly mounted in known manner in a supporting framework 11 for substantially free endwise movement along a substantially horizontal plane within the framework 11. At one end of screen 10 is mounted a U-shaped bracket 12 carrying a tixed shaft 13. Freely rotatable around shaft 13 are two

hollow pulleys

15 and 16, mounted for rotation about shaft 13 as by bearings 17.

The outer peripheries of

pulleys

15 and 16 are toothed, asV

indicated by the teeth 19, to accommodate the internal rib 2Q of an endless timing belt 25 which runs, as shown, over both

pulleys

15 and 16, around a drive pulley 26 driven by a motor 27 and around an idling pulley 28.

As will be apparent from the foregoing, the internal ribs 20 on drive belt 25 engage in the teeth 19 on

pulleys

15 and 16. Thus with the belt threaded as shown in the drawing,

pulleys

15 and 16 will be positively driven at the same speed but in opposite directions and in continually maintained timed relation with each other.

Pulleys 26 and 28 need be merely flat pulleys acting on belt 25 since a positive guarantee against slippage of the belt around these pulleys is of little consequence provided the exact timed relative positioning of

pulleys

15 and 16 With respect to each other is maintained.

Pulleys 15 and 16 contain fastened therein at one point around the periphery thereof

heavy weights

30 and 31, each eccentrically arranged within its respective pulley and each of sufficient size and mass with respect to the size and mass of pulleys v15 and 16 to give a substantial unbalanced force as the pulleys are rotated.

In the operation of the device, the toothed pulleys are set with respect to each other by timing belt 25 so that, during continued counter-rotation of

pulleys

15 and 16, the

weights

30 and 31 therein meet or come face to face or pass each other at the horizontal centerline of the device, but are diametrically opposite as they pass the vertical centerline of the device. This sequence of conditions is illustrated diagrammatically in Fig. 3 where weight 31 is shown in full line infour sequential positions while weight 30 is shown in dotted lines in the positions it assumes at the same movements of time that pulley 31 is in the positions shown for it.

Fromvthe foregoing, it will be noted that the meeting or passing of both eccentric weights 30 and 31 (each time each one passes the horizontal centerline of the device) will give an impact or moment of force along the horizontal centerline, the direction of this force depending upon which side of the vertical centerline the meeting of the

weights

30 and 31 occurs. When

pulleys

15 and 16, on the other hand, are rotated so that the

weights

30 and 31 are passing the vertical centerline of the device, the weights will be diametrically opposed and substantially in balance with each other with no substantial moment of force along the vertical centerline, and the two weights will remain substantially in balance and each counteracting the vibrational force of the other except adjacent the horizontal centerline where the cen,-

trifugal force acting on each of the

eccentric weights

30 and 31 will cooperate toproduce'a substantial oscillatory force along the horizo-ntal plane.

In this manner, accordingly, considerable vibration or oscillation can be imparted to screen primarily along a horizontal plane without also imparting substantial vertical components of vibratory force to the supporting framework 11. It should also be noted that, because of the belt drive, motor 27- can-be-mounted onframe 11, rather than on the movingscreen 10, despite continued movement of the screen and bracket 12 and

pulleys

15 and 16 with respect to frame 11 and motor 27. Furthermore, both pulleys and 16 are concentrically mounted on a common shaft so that the counterbalancing of the

weights

30 and 31 at the vertical centerline and the cooperative unbalancing of the

Weights

30 and 31 when they pass the horizontal centerline are enhanced as compared to a case where

pulleys

15 and 16 were not concentrically'mounted on a common shaft. Also, the absence of a gear drive for effecting the timed positive counter-rotation of pulleys 1S and 16 means that there is no particular need for a gear box or other oil-tight casing to enclose the device nor of jack shafts or other extra parts.

It will accordingly be seen that this device provides asimple, readily accessible, and economical means for producing oscillatory or vibrational motion in one plane while avoiding vibrational components in other planes. As will be apparent from the foregoing, it makes little or no difference as to in which plane it is desired for the driving motion to occur since whether the oscillating or vibratory motion produced by this device acts in a horizontal plane or in a vertical plane or in any other plane depends merely upon the initial setting of

pulleys

15 and 16 with respect to each other by belt 25 so as to determine at what

point weights

30 and 31 will be adjacenteach other and at which points during rotation they will be diametrically opposed and in balance.

While the forms of apparatus herein described constitute a preferred embodiment of the invention, it is to be understood that the invention is not limited to these precise methods or forms of apparatus, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.

What is claimed is:

l. An oscillating drive device of the character described for imparting oscillatory motion to apparatus along substantially only a single plane, comprising a pair of coaxial pulleys, means for mounting said pulleys for counter-rotation on said apparatus, an eccentric weight of substantial mass on each of said pulleys, an endless positive drive timing belt for positive engagement with said pulleys, means for driving said belt, and means for threading said belt for counter-rotation of said pulleys with respect to each other.

2. An oscillating drive device of the character described for imparting oscillatory motion to apparatus along substantially only a single plane, comprising a pair of coaxial pulleys, means for mounting said pulleys for counter-rotation on said apparatus, an eccentric weight of substantial mass on each of said pulleys, a positive drive timing belt for positive engagement with said pulleys, means for driving said belt, and means for threading said belt for counter-rotation of said pulleys with respect to each other, said belt being threaded over said pulleys to time said counter-rotation thereof effecting meeting of said eccentric weights in said single plane and separation of said eccentric weights in other planes.

3. An oscillating drive device of the character described for imparting oscillatory motion to apparatus along substantially only a single plane, comprising a pair of coaxial pulleys, means for mounting said pulleys for counter-rotation on said apparatus, an eccentric weight of substantial mass on each of said pulleys, the outer edges of said pulleys being toothed, a positive drive-timingbelt hav-- ing ribs on the inner surface thereof for engaging said mtoothedv pulleys, means for driving said belt, and means for threading said belt for counter-rotation of said pulleys with respect to each other.

4. An oscillating drive device of the character described for imparting oscillatory motion to apparatus along substantially only a single plane, comprising a pair of coaxial pulleys, means for mounting said pulleys for counter-rotation on said apparatus, an eccentric weight of substantial mass on each of said pulleys, the outer edges of said pulleys being toothed, a positive drive timing belt having ribs on the inner surface thereof for engaging said toothed pulleys, means for driving said belt, and means for threading said belt fo-r counter-rotation of said pulleys with respect to eachother, said belt being threaded over said pulleys to time said counter-rotation thereof effecting meeting of said eccentric weights in said single plane and separation of said eccentric weights in other planes.

5. An oscillating drive device of the character described for imparting oscillatory motion to apparatus along substantially only a single plane, comprising a pair of coaxial pulleys each of which is eccentrically unbalanced, means for mounting said pulleys for counter-rotation on said apparatus, a positive drive timing belt for positive engaging and timing said pulleys, means for driving said belt, and means for threading said belt for counter-rotation of said pulleys with respect to each other, said belt being threaded over said pulleys totime said counter-rotation thereof effecting joining of said unbalancing in said single plane and offsetting of said unbalancing in other planes.

6. In an oscillating drive of the character described for imparting oscillating motion to apparatus to be oscillated in substantially but a single plane, the combination which comprises a pair of counter-rotating eccentrically weighted pulleys, means for mounting said pulleys for rotation in face to face relation on said apparatus to be oscillated, a positive drive belt for positive engagement with said pulleys, a drive pulley for driving said belt, means for mounting said drive pulley on a portion of said apparatus which is stationary and not oscillating, means for threading said drive belt over said eccentrically weighted pulleys and said drive pulley for continuous counter-rotational driving of said eccentrically weighted pulleys, and said eccentrically weighted pulleys being angularly positioned with respect to each other so that said eccentric weights thereof meet during counter-rotation of said pulleys only in said plane in which said apparatus is oscillated.

7. In an oscillating drive of the character described for imparting oscillating motion to apparatus to be oscillated in substantially but a single plane, the combination which comprises a pair of counter-rotating eccentrically weighted pulleys, means for mounting said pulleys for rotation in face to face relation on a common shaft on said apparatus to be oscillated, an endless positive gripping drive belt for positive engagement with said pulleys, a drive pulley for driving said drive belt, an 'idler pulley for engaging said drive belt and spaced from said drive pulley, means for mounting said drivepulley and said idler pulley on a portion of said apparatus which is stationary and not oscillating, said drive belt being threaded over said eccentrically weighted pulleys and between said drive pulley and said idler pulley for Continuous counter-rotational driving of said eccentrically weighted pulleys and said eccentrically Weighted pulleys being angularly positioned with respect to each other so that said eccentric weights thereof meet during counter-rotation of said pulleys only in said plane in which said apparatus is oscillated.

8. ln an oscillating drive of the character described for imparting oscillating motion to apparatus to be oscillated in substantially but a single plane, the combination which comprises a pair of counter-rotating:eccentrically weghted=pulleys, -m'eans' for mountingsaid rpulleys vfor rotation in face to face relation on said apparatus to be oscillated, the outer periphery of said pulleys being toothed, a positive gripping drive belt, said belt having ribs on the inner surface thereof for positive engagement with said toothed surfaces of said pulleys, a drive pulley for driving said drive belt, an idler pulley for engaging said drive belt and spaced from said drive pulley, means for mounting said drive pulley and said idler pulley on said apparatus, said drive belt being threaded over said eccentrically weighted pulleys and between said drive pulley and said idler pulley for continuous counter rotational driving of said eccentrically weighted pulleys 6 and said eccentrically weighted pulleys being angularly positioned withl respect to each other so that said eccentric weights thereof meet during counter-rotation of said pulleys only in said plane in which said apparatus is oscillated.

References Cited in the le of this patent UNITED STATES PATENTS 1,828,136 Freedlander Oct. 20, 1931 1,943,220 Keefer Jan. 9, 1934 2,065,798 Dempsey Dec. 29, 1936 2,511,885 Thompson June 20, 1950