US1163283A - Eraser-cleaning machine. - Google Patents

Description

G. U. THOMPSON.

ERASER CLEANING MACHINE.

APPLICATION FILED JVULY 3,1914.

1,163,283. Patenfd De0.7,1915.

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ERASER-GLEANING MACHINE.

Specification of Letters Patent.

Patented Dec. "2, rats.

Application filed July 3, 1914. Serial No. 848,791.

To all w ham it may concern :Y

Be it known that I, GRANT U. THOMPSON, a citizen of the United States of America, and a resident of Cedar Falls, Blackhawk county, Iowa, have invented certain new and useful Improvements in Eraser-Cleaning Machines, of which the following is a specification.

Myinvention relates to improvements in eraser cleaning machines, and the object of my improvement is to provide means for diiferentially varying the speedsof rotation of the cleaning drum and the air exhausting fan-wheel in communication therewith, of said machine. This object I have accomplished by the means which are hereinafter described and claimed, and which are illustrated in the accompanying drawing, in which the figure is a side elevation of my improved eraser cleaning machine, with the cleaning drum and fan-wheel chamber shown in vertical, longitudinal axial section.

My improved apparatus comprises a supporting frame having the spaced end uprights 18 and 29 connected by means of longitudinal bars on the sides, and having alined hearings on their upper ends adapted to receive the rotatable shaft 9, the crank 30 being mounted on the left hand end of the said shaft and provided withahandle 31.

The numeral 1 denotes a hollow cylindrical cleaner drum, loosely and. non-slidably mounted on said shaft 9, and having hearing openings in its opposite heads to receive said shaft 9 therethrough, the left hand bearing 20 having an outwardly extending dentated clutch part 21 adapted to detachably receive dentations 22 on a mat ing clutch sleeve 23, the latter slidably and non-rotatably mounted on said shaft 9 and provided with an annular groove. In a bearing 28 in the frame upright 29 is secured a fork 27, in which is i pivotally' mounted the lower end of an end lever 26, whose middle part is formed of detachably connected half rings 25 having inwardly projecting pins 24, the latter extending movably into the clutch part 23. By shifting the lever 26, the said clutch parts may be brought into or out of engagement with each other to detachably securethe drum 1 to the shaft 9. The clutch- parts 22 and 21, when mated, fix the drum 1 on the shaft 9. The drum may be uncoupled from the shaft, when it is desired to use the fan-wheel 7 alone to exhaust dust-laden air from the drum, after the latter is in a state of rest. In the left-hand endof said drum, a number of small openings 34 are arranged about the bearing 20 to serve as air-inlets. The right hand head of the drum 1 has a centrally located inwardly offset part 3 having a number of orifices or air outlets 4 therein in communication with a fan-wheel chamber 8, the latter having an orificed bar 32 in line with the bearing openings in said drum. A sleeve 6 is rotatably and nonslidably mounted upon the shaft 9 within said chamber 8 and has its right hand end extending through the bearing 32 with a pinion 10 fixedly mounted on its outer end. A plurality of vanes 7 project from the --sleeve6 within the chamber 8, forming a fan-wheel adapted to exhaust the air from the drum 1 when in rapid rotation, to carry said air with any chalk dust floating therein through saidchamber 8 and its depending outlet conduit 19 to the interior of a dust collector 33 located beneath said drum. A ring 5 is seated within the inner end of the chamber 8 and has an integral inwardly coned part adapted to receive the entering air currents passing through the outlets 4 in the drum, to direct same toward the fanwheel 7.

I have adopted the following means for establishing differential speeds of rotation of the shaft 9 and fan-wheel 7: The numeral 14 denotes a bearing sleevefixedly mounted in the right hand frame upright 18, and containing arotatable counter-shaft on which is mounted the fixedly connected pinion l3 and gear wheel 11, the latter being in mesh with the pinion S on said sleeve 6. A gear wheel 12 is fixedly mounted on the shaft 9 and is in mesh with said pinion 13. The numeral 16 denotes an electric motor mounted on the bracket 17 of the frame, and whose driving shaft has a pinion 15 thereon in mesh with said gear wheel 11. It is obvious that by the means of the use of said gear-train, the shaft 9 and sleeve 6 may be rotated at different speeds, the fanwheel 7 being rotated at a much higher rate of speed than the drum 1. This permits of the air being effectively exhausted from the drum 1 while the latter is rotating at a low rate of speed to tumble about any blackboard erasers which have been deposited therein through its swinging closure 2.

Either the motor 16 or the hand crank 13 may be used to impart the differential rotaconduit 19.

My said apparatus is thus very sanitary for use in school buildings, as no chalk dust can possibly escape into the building.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is:

In combination, a supporting frame, spaced bearings therein, a rotatable shaft mounted in said bearings, means for rotating said shaft, a hollow drum mounted rotatably non-slidably upon said shaft, said drum having an opening, a closure for said opening, said drum having a clutch-face on one end, a mating clutch-member slidably non-rotatably mounted on said shaft adapted to be shifted into or out of clutch with the clutch-face on said drum, said drum having air-inlets in one head, the opform provided with a plurality of small airoutlets, a cylindrical chamber seated within said cylindrical rentrant part and provided with an air-vent, an air-exhausting rotary fan mounted in said cylindrical chamber, means for rotating said drum and said fan at different speeds of rotation, and an inwardly coned collar seated about the inner face of said fan and adapted to draw the dust-laden air from the drum between the vanes of the fan to be delivered to the vent of said chamber without'precipitation in the chamber.

Signed at Waterloo, Iowa, this 16th day of June, 19%.

GRANT U. THOMPSON.

Witnesses:

W. H. BRUNN, GEO. G. KENNEDY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. (3.

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