US2366033A

US2366033A - Vibrator

Info

Publication number: US2366033A
Application number: US471747A
Authority: US
Inventors: Robert L Johnstone
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-08-21
Filing date: 1943-01-08
Publication date: 1944-12-26
Anticipated expiration: 1961-12-26

Description

Dec. 26, 1944. R. L. JOHVNSTONE VIBRATOR Original FiIed Aug. 21, 1942 2 Sheets-Sheet 1 r Fig. 2.

Patented Dec. 26, 1944 UNITED STATES PATENT OFFICE VIBRATOR Plobert L. J ohnstone, University City, Mo.

8 Claims. (CI. 7461) This invention relates to vibrators for imparting vibratory or reciprocal motion to various types of devices, such as screens for different purposes, feeders, classifiers, conveyors, and other mechanisms.

Objects of the invention are to provide an improved vibrator mechanism for translating a continuous rotary motion into a vibratory or straight line reciprocal motion and imparting said vibratory or straight line reciprocal motion to the operated device such as a screen, etc.; to provide a continuously rotated vibrator mechanism having the weights that effect or create vibration arranged to distribute the forces over a much wider area, approximately 180 more or less, than other types of vibrators now in general use and with which I am familiar; to provide an improved vibrator mechanism having a rotaryshaft driven by the motor, in combination with a tubular shaft or sleeve mounted concentrically on said first shaft and having a weight attached thereto between weights that are attached to the driven shaft; to provide a novel system of bearings for supporting the driven shaft and the tubular shaft or sleeve, respectively, so that the weight and forces of each shaft are supported independently of the other shaft, thus relieving each shaft from forces, strains, and stresses of the other shaft; and to provide a novel system of gearing for rotating the tubular shaft or sleeve by the coaxial driven shaft in order to create vibration and distribute the forces over approximately 180 more or less.

Other objects will appear from the following description, reference being made to the annexed drawings, in which- Fig. 1 ma top plan view of a vibrator and cooperating mechanism constructed and assembled in accordance with the present invention.

Fig. 2 is a side elevation of the vibrator and 40 mechanism shown in Fig. 2, parts being broken away to show other parts in section.

Fig. 3 is an enlarged longitudinal sectional view of the vibrator mechanism on the line 3-3 of Fig, 4 is a side elevation of one of the weights showing the relatively wider area thereof for distributing the vibratory forces over approximately 180 more or less.

This is a division of my copending application Serial No. 455,657, filed August 21, 1942, now PatentNo. 2,325,2 18, July 27, 1943, for Vibrator.

The present invention for translating a continuous rotary motion into a vibratory or reciprocal motion, and thereby imparting a vibratory or reciprocal motion to the ultimate device to be operated, is shown assembled and mounted for imparting such motion to a screen or the like. In the embodiment chosen for illustration of thelinvention, the device I to be vibrated is 60 supported by pairs of trunnions 2 having the trunnions of each pair axially alined. While the device l is shown in an approximate horizontal position, it is plain that said device may be mounted in a vertical position, or at any angle between horizontal and vertical positions. The

trunnions 2 are supported in bearings 3 provided with elastic bushings, as disclosed in my said copending application. The bearings 3 are detachably connected with the upper ends of flat springs 4. The lower ends of said springs are detachably secured to supporting members 5 constituting a part of a rigid frame 6. The inherent resiliency of the flat springs 4 will cooperate with the vibrator or actuating mechanism to move or return the device I toan initial or starting position when the actuator orvibrator is stopped. The springs 4 are-freely bendable throughout theirilengths so-tha-t 'theJtenden-c to crystallize or deteriorate as a result of their bending operations is minimized. Further, the elastic bushings in the bearings 3 additionally reduce the tendency toward deteriorationof the springs 4.

The unit .of the apparatus for imparting vibratory or reciprocal motion to any device such as the device I is shown in Fig. 3 of the drawings.

The principal parts of the unit ar enclosed in a housing comprising end members I and 8 and an intermediate housing member 9. These three housing members are assembled in endwise abut- I tin arrangement and-are rigidly secured to ether by removable and replaceable bolts Ill. The intermediate housing member 9 encloses integral webs l I which are spaced apart about the same distance that separates them from the respective end walls of the housing.

A power-driven shaft I2 is journalled in bearings l3 and M in the end housing members 1 and 8, respectively. One end of the shaft l2 projects through an appropriate bushing in a covering cap I 5 attachedto the end member I, and the opposite end of ,saidshaft l2 and its bearing Mare covered and enclosedby a cap [6 detachably secured to the end member 8. r

A tubular shaft or sleeve I! is mounted on and is coaxial with the driven shaft l2. As shown,

the shaft or sleeve H is much shorter than the shaft.l2,-leaving the endsof the shaft 12 projecting beyond the shaft I1 and into ,the bearings l3 and I l. The bushing or sleeve [1 has its ends journalled in bearings-l8 mounted in and supported by the two webs I l in axial alinement with each other and with the bearings l3 and I4. This novel system of bearings supports the driven shaft l2 and the tubular shaft or sleeve ll, respectively,; so that the weight and forces of each shaft are supported independently of the other shaft, thus relieving each-shaft from forces, strains and stresses of the other shaft. The tubular shaft orsleeve, ll isheld from endwise 2,866,083 shaft for rotating said'tubular shaft and thereby said second weight.

2. Mechanism for producing and imparting vibratory motion comprising a housing supported for vibratory movement-sconnections for imparting vibratory movements of said housing to a device to be vibrated, a driven rotary shaft supported by said housing for rotation, a pair of spaced alined unitary and radially immovable weights each having a circumferential length of about 180 attached to said shaft for rotation thereby, a pair of spaced bearings supported in ugal fonces through about 360 when said secondweight is diametrically opposite from said first weights, axially alined gears attached to said first shaft and to said tubular shaft respectively, and

a gear for rotating said gear that is attached to said tubular shaft by said gear that is attached to said driven shaft. w

' 3. Mechanism for producing and imparting vibratory motion comprising a housing, a driven shaft, a tubular shaft in said housing coaxial with said driven shaft, separate pairs of axially alined bear ngs supporting said driven shaft and said tubular shaft for rotation in opposite directions, means for rotating said driven shaft, gearing for rotating said tubular shaft by and in the opposite direction from said driven shaft, and unitary and radially immovable weights attached to and wholly supported at all times by said shafts rebratory motion comprising two coaxial shafts of different lengths, bearings for supporting the longer of said two shafts, a pair of additional bearings located between said first bearings supporting the shorter of said two shafts, mechanism for rotating said longer shaft, gearing for rotating said shorter shaft by said longer shaft, and unitary and radially immovable weights attached to and wholly supported at all times by said shafts respectively and each having an arc of at least 180 providing a substantially even and uniform flow of centrifugal force when said shafts are rotated.

5. Mechanism for producing and imparting vibratory motion comprising two'coaxial shafts one of which is longer than th other, spaced bearings for supporting said longer shaft, a pair of additional bearings located between said first bearings and supporting said other shaft, gearingior rotating said other shaft'by said longer shafft, unitary and radially immovable weights attached to and wholly supported at all times by said longer shaft beyond the ends of said other shaft and each having an arc of at least 180, a unitary arc of at least 180 and'cooperating with said first weights to provide substantially even and.

uniform flow of centrifugal fonce when said two shafts are rotated, and mechanism for rotating said longer shaft.

6. Mechanism for producing and imparting vibratory motion comprising two end bearings and two intermediate bearings. between and axially alined with said end bearings, a tubular shaft journalled in said intermediate bearings, a driven shaft extending through and rotative in said tubular shaft and journalled in said end bearings, gearing for rotating said tubular shaft by said driven shaft in the opposite direction of rotation of said driven shaft, a pair of spaced alined unitary and radially immovable weights attached to and wholly supported at all times by said driven shaft laterally beyond said intermediate bearings, and a weight attached to said tubular shaft between said intermediatev bearings and having about the same circumferential length as said first named weights and cooperating therewith. to distribute centrifugal forces through a complete circle when said second weight is diametri cally opposite from said first weights.

7. Mechanism for producing and imparting vibratory motion comprising a frame supported for vibration, two end bearings and two intermediate bearings between and axially alined with said end bearings, means for supporting all of said bearings in said frame, a tubular shaft journalled in said intermediate bearings and terminating short of said nd bearings, a driven shaft extending through and beyond the ends of said tubular shaft and journalled in said end bearings, a gear wheel attached to said driven shaft, a complementary gear wheel attached to said tubular shaft between said intermediate bearings, a gear engaging both of said gear wheels for rotating said tubular shaft by and oppositely from said driven shaft, a pair of spaced alined unitary and radially immovable weights attached to and wholly supported at all times by said driven shaft laterally beyond said intermediate bearings and between said end bearings, and a unitary and radially immovable weight attached to and wholly supported at all times by said tubular shaft between said intermediate bearings and having about the same weight as the sum of said pair of weights.

8. A unit for imparting vibratory or reciprocal motion comprising two end members, an intermediate member rigidly and detachably secured to said end members, two end bearings mountedin said end members, two intermediate bearings supported by said intermediate member between and in axial alinement with said end bearings,

a tubular shaft journalled in said intermediate bearings and terminating short of said end bearings, a driven shaft extending through and rotative in said tubular shaft and journalled inv said end bearings, gear wheels attached to said tubular shaft and said driven shaft respectively at opposite sides of one of said intermediate bearings, a gear engaging said two gear wheels for rotating said tubular shaft by and oppositely from said driven shaft, a pair of alined unitary and radially immovable weights attached to and wholly supported at all times by said driven shaft laterally beyond said intermediate bearings, and a unitary and radially immovable weight attached to and wholly supported at all times by said tubular shaft between said intermediate bearings and ROBERT L. J OHNSTONE.