US1571550A - Venting apparatus for motors - Google Patents

Description

Feb. 2, 1,925. 1,571,550

l T. P. KIMMAN VENTING APPARATUS FOR MOTORS Filed Jan. 3. 1922 Patented Feb. 2, 1926.

UNlTED TES 1,511,550V PATENT o FFic THEODORE B'KIMMAN, 0F CLEVELAND, OEI, ASSIGNOR T@ CHICA@ BNEH'IIC T0013 COMPANY, OF NEW YORK, N. Y., A CURPRATIGH 0E NEW mY.

VENTNG LPPARA-T'S FOR MTGRS.

Application filed January 32 intl-2. Serial. No. 536,652.

To all whom 'it may concern.'

Be it known that I, THEoDoRE` l). KXMMAN, a citizen ci the United States," residing at Cleveland, in they county of Cuyahoga and State of Ohio, have invented certain new and useful improvements in Venting Apparatus for Motors, of which the following is a speciiication. -Y

My invention relates in general to motors and specifically to the motors of hand operated (xr-portable tools, such as machines for grinding, polishing, buiing, brushing and the like, and more particularly to improved venting means for permitting escape or exhaust of air, compressed in the crank case, whileprevcnting escape ot the lubricating oil `with the air. Pneumatically operated tools are necessarily operated at high speeds and therefore require constant and efficient lubrication, which is usually .of the type iin which the oil is splashed or thrown 0H by the crank shaft. Some of the compressed air, conducted to the cylinders to operate the pistons and hence the crank shaft, escapes W" past the pistons into the crank case, Where the pistons tend, to compress it. Venting means have been used prior to my invention to permit the excess air to be 'exhausted from the crank case', but such venting means have 30 proven deficient and objectional, in that no provision has been made to prevent escape of the lubricating oil withlthe air.

The-principal object of my invention is to provide means for eifectually preventing thev 35 lubricating oil from being carried' out of the crank' case with the air escaping through the vent tube or conduit. To this end, l provide a simple,v durable and highly ecient centrifugal. device, which separates the oil from the air escaping` through the vent tube. With the above and incidental objects in view, the invention consists in certain -novel features of construction and combinations oi parts, the essential elements whereof are recited in the appended claims and the preferred form oi embodiment of which is described' in detail hereinafter and illustrated in tull in the accompanying drawings, which form part of this specification.

@t said drawings, liig. 1 is a sectional elevation'oi a pneumatic tool, embodying my invention, and llig. 2 is a cross-section through the tool, as on the line 2-2 oi Fig, l. r Referring to the drawings, the pneumatic tool shown is or' a well known construction andmay he used for grinding, polishing, v bulling and similar purposes. It comprises in general the casing 6, opposed cylinders 7, arranged at an angle ci 90 with respect to each other, a crank shaft 8, connected byconnecting rods to the pistons in the cylinders, av handle 13 for holding the tool and controlling its operation, and a tool shaft 10, operated by the crank shaft through the medium of gears 11 and 12. The casing ti comprises the central portion or body cast integral with the cylinders v7, and end ca s or cases 14 and 15, which carry suitab e bearings tor-supporting the crank shaft 8 and shaft 10.' The gear case 15 is provided with a tubular extension 15a for housing part of the shaft l0, and at its outer end carries fa shield or guard 16 which is positioned around the wheel (not shown), which is mounted on the end of the shaft for performing the function for which the tool is to Abe used. The extension 15 also carries bearings'lb for the tool shaft 10. I have' shown a tool of the type described for the` purpose of illustration only and' it is to be understood that my invention is susceptible of use in pneumatic tools or motors used for di'erent purposes than those mentioned above, and that I do not intend to limit the application of m invention to pneumatic tools of any speci c kind. Y

he means, constituting the subject matter of my invention, comprisesv a vent tube 17, a centrifugal oil separator 18 and a plate or cover 19 on the tube. The tube 17 1s securedv at its upper end and by any suitable means in an opening in the to of the tool casing and it is bent interme iate its ends so that its opposite end portion extends hori zontally and intothe separator 18. The separator is cylindrical in :torni and has e. large chamber 2O in one end. e wall ot the chamber 20 is rovided with holes 2l.. The opposite end cip the separator 18 is pro vided with a screw threaded projection 22 which is screwed into a screw threaded re cess 23 in the inner end oi the tool shaft 10, so that the separator isi in arial ment and rotated as a 'unit `with the tool shaft 10. The dished disc or cup like plate 19 is provided with a central open ing through which the pipe or tube 'l'l on tends and the disc 19 has a projecting brachet or toot 2d secured to a portion 25 oit the tool casing 6 by any desired means such as mi Miti der

screws. It will be noted that the vent tube 17 and associated device, for preventing escape of oil, are positioned between theo posedcylinders, While the crank shaft 8 1s positioned in the bottom of the apparatus.

From the above descriptiomthe operation. of the mechanism,` embodying my invention, will be apparent.. that the lubricating oil is to be maintained at the desired level in the crank case, and

that the oil is splashed or thrown by the crank shaft and connections to lubricate the travelin device. The air, which escapes from the cylinders, pastr the pistons and into the crank case, upon being compressed in he crank case escapes through the chamber 2O of the end of t e tube.

l have described above one form of emi bodiment of my invention, but it is lto be understood that the invention is susceptibleof various changes and modificatinsfall coming Within the scope andA spiritnf'iny p invention, as defined in the following claims.

I claim:

1. Means for venting the crank casing of a motor comprising avent passage opening into a chamber within said casing, said chamber having a perforate wail adapted to be rotated when the motor is in operation whereby7 centrifugal force is utilized to re-- strain lubricant splashed about4 in the casing from entering said passage.

2. A venting device for the crank casing of a motor coriprisiwY a rotatable chamber within the casing, l chamber having an apen end ope in the walls thereof, a vent duct g the open end ci' said chamber, a at c tor assceiated with It will be understood along the tube 17 into the open chamber, and means for rotating said chamber when .the motor is in operation, Whereby lubricant splashed inte and upon said chamber or carried -therein by the vented gases is `returned lby centrifugal force to the casing. v

3. In a device of the class described, the combination of a casing, a crank shaft therein, lubricant in the casing, a perforated device open atan end to .permit escape of the air butprevent escape of-lubricant therewith, a conduit through which the air escapes, and a stationary plate over the open endh of said device.

4. I na device of the` class described, the combination of a casing, a crank shaft therein, llubricant in the casing, a perforated device open .at anlend to permit escape of the air lbut prevent cscapeof lubricant therewith, a conduitthrough which the air escapes, and a stationary plate over the open end of said device and through which the end of the conduit projects.

5. In a device of the class described, thc combination of a casing, a crank shaft therein, lubricant'in the casing, a tool shaft operated by the'. crank shaft, a perforated dcvice secured to said tool shaftand open at one end to permit escape of the air but prevent escape of lubricant therewith, a conduit through whichair escapes, and a stationary plate over-j the open end of said device. y

6. venting device for the crank casing of a motor comprising a rotatable chamber within the casing, said chamber having an open end and openings in the walls thereof, astationary deflector closing the open end of said chamber, a vent duct extending through said deflector and terminating within said chamber, and means for rotating said chamber when the motor is in operation. whereby the lubricant splashed about in said casing is prevented from passing out through said duct with the vented gases.

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