US1143064A - Pneumatic turbine-grinder. - Google Patents

Description

C. PERKINS. PNEUMATIC TURBINE GRINDER. APPLICATION FILED NOV. 20, 1914.

Patented June 15, 1915.

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Inventor. Charles PerKins,

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CHARLES PERKINS, F BRIDG-EWATEB, MASSACHUSETTS.

, PNEUMATIC TURBINE-GRINDER.

' o representing like parts. I

. This invention relates to hand tools and consists of a novel construction of a turbine grinder..

The object of this invention is to obtain a portable and manually operable power driven grinder.

Another object is to provide a rotary grinder in which the means for imparting rotation are adjacent the tool.

Another object'is to secure an easily manipulated light weight compressed air turbine grinder. whose moving elements .are

A dirt-proof, which has few parts, and is simple in construction, and can be produced at small expense.

In order to give an understanding of this invention, thereis illustrated in the drawings a selected embodiment of the same which will now be described.

Figure 1 is a median section of the grinder; Fig. 2 is an elevation ofthe parts shown in Fig. 1, looking from the right hand end, with the ring plate partly broken away; Fig. 3 is a section on the line 33, Fig. 1;

- Fig. 4: is a section on the line 4.-4, Fig. 2;

I This novel construction of thegrinder is formed in this selected embodiment with a housing 1 in which is revolubly mounted a rotor shaft 2 and the impulse wheel 3 -hav-' .4o ing an annular web 4 upon the periphery 5 of which are secured the vanes 6. Radial ribs 7 are cast integral with the main housing 1 and give rigid support to the part of the housing containing the impulse wheel. The air intake face of the housing is closed by means of the cover 8. The housing has cast integral therewith the ears 9 containing threaded recesses while the cover has similar ears 10 bored to receive the screws 11 which are secured in'the threaded recesses of the housing ears 9 and the cover thereby secured to the housin The cover 8 has a central extension 12 w ich aifords a bearing for the rotor shaft 2 and a housing for the air supply duct 13. This air duct13- terminates in a coupling towhich may be Specification of Letters Patent.

Patented June 15, 1915.

Application filed November 20, 1914. Serial No. 873,124.

secured a flexible tube or other flexible means for furnishing an air supply. The air' duct 13 terminates at its'inner end in the transverse air pipe 14 which leads in both directions to the annular channel 15 in the cover. The ring plate 16, secured to the cover 8 by the screws 17, closes the channel 15 and thus forms an annular air pipeway.

The ports or nozzles 18 cut in the cover 8 form the means for directing the compressed air against the vanes 6. The nozzles 18 in this selected embod iw a o a rl 'elg nfl conical type and, as shown in Fig. 4 lead off at an angle .of approximately 20 from the air channel 15. The compressed air is thus directed tangentiallv to impinge upon the vanes 6 of the turbine wheel. There are four such nozzles shown in the accompanying drawings, and they are equi-distantly located in the channel 15. The vanes 6 ofthe impulse-wheel are curved and the compressed air impinging thereon drives the wheel, the air being then exhausted through the exhaust ports 19 which are open to the atmosphere. These exhaust ports are formed by cutting narrow openings in the face of the wheel housing opposite the cover. These ports are placed a short distance beyond each of the air intakes or nozzles andthus give the compressed air a working distance between the intake and the exhaust sufiicient to utilize the expansive force of the air. I

The rotor shaft 2 terminates in a coupling 20 secured to the grinder shaft 21 while the housing 1 terminates in a threaded flange 22 which is secured in a similarly threaded recess in the casing 23 of the grinder shaft.

This grinder shaft projects from its casing and has a collar 24 secured thereon by a pin 25, the collar being held against the flange 26 of the grinder shaft casing. The

shaft end 28 is threaded and a grinder 29 is slipped thereon against the washer 30 and retained by the check nut 31. The grinder to the transverse air-way 14 leading in two directions to the circular pipe 15. The'nozzles 18 of the diverging type permit a slight expansion of the air as it passes to the vanes 6 of the turbine wheel whereon it impinges tangentially. The air has an effective working area from the .ti of the nozzle to the beginning of the a jacent and opposedly positioned exhaust ports. As the successive vanes pass the exhaust ports the spent airis exhausted into the atmosphere. The turbine is mounted upon, and is rotatable with, the

rotor shaft which in turn drives, through the medium of the coupling 20, the shaft upon which the grinding surface is secured.-

There is thus produced an eflicient portable power-driven grinder which can be easily and eifectively operated at varying distances from the source of power. The grinder has few elements and those which are vrotatory have dirt-proof bearings? It is compact, light and-small-in practice, the preferable size of the wheel is from four to nine inches. The linear speed of the grinding surface is high-accomplishing the work quickly and efficiently. It is inexpensive to manufacture, not easily deranged, and can be manipulated with facility.

. This apparatus is especiallyeflicient as a means for, brushing or scrubbing hard surfaces, as for example building and other walls and for removing rust from iron surfaces. A stifl' wire brush may be attached, for this purpose, to the threaded shaft end. It is obvious that this tool may be'used forbuifing, boring or drilling by simply securing the appropriate tool on the threaded shaft end.

'Having fully described my invention, what I claim as new and desire to secure by Letters Patent is: 1:

1. A portable tool comprising a rotor, a rotor shaft, a housing. for said rotor, a cover for said housing, an annular conduit in saidcover, a plurality-of ports in said'cover for directing an elastic fluid to said rotor, a plurality of exhausts in said rotor housing, an extension to said cover, comprising a casing for said rotor shaft and avduct fordirecting an elastic fluid to said annular conduit and means for supplying an elastic fluid under pressure to said duct.

2. A portable tool comprising a rotor, a

rotor shaft, a housing for said rotor, a cover for said housing,"an annular conduit in said cover, a plurality of ports in said conduit adjacent the periphery of said rotor for directing tangentially to its vanes an elastic flu a plurality of complementary exhaust orifices in said housing, said orifices 'bei'ngloifset with respect to said ports whereby an elastic fluid is 'ven an effective working istance along ti e periphery. of said roto a duct in said cover for directing an elastic fluid to said conduit and means in said cover for aflt'ording a plurality of passages for an elastic flllld from said duct to said conduit and means for supplying an elastic fluid under compression to said duct.

3. A portable power tool comprising a rotor, a rotor shaft, a housin for said rotor, a cover for said housing, said cover containing an annular conduit, a pipe having a plurality of passages thereto, a duct for directing a supply of an elastic fluid under compression to said pipe and flexible means secured to said duct whereby a supply of an orifices in said housingadjacent the side of therotor op osite said cover for exhausting the fluid an means for supplying an elastic fluid under compression to said intake.

In testimony whereof, I have signed my CHARLES PERKINS.

Witnesses: i MAURICE W. Moons,

THQMAS J. DRUMMOND.

I name to this specification, in the presence of i two subscribing witnesses. I

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