US1009113A - Grease-plug. - Google Patents

Description

o. NATERRY. GREASE PLUG.

APPLICATION FILED APR. 7, 1908.'

` www@ Nos/.21, 1911.

' 0. N. TERRY.

` GREASE PLUG. APPLIOATION P11131; Amm?, 190s.

l S,E091 l S. 1 Patgnted 1101.21, 1911.

2 SHEETS-SHEET 2.

wrench.,

UNrrEi) strain:sl PATE fr rricu.

OTIS TERRY., OF LINCOLN, NEBRASKA, ASSIGNOR Ol? ONE-HAIF TO ROBERT D.

y SMITH, 0F BOSTON, MASSACHUSETTS.

GREASE-PLUG.

Application filed April 7, 1908. Serial No. 425,682.

A To all whom it may concern:

Be it known that l, Oris N. TERRY, acitizen of the United States, residing at Lincoln, in the county ot Lancaster and State of Nebraska, have invented certain new and useful Improvements in Grease-Plugs, of which the following is a specification.

The object of my invention is to provide an improved closure for grease cups which shall be held in .place by engagement with the grease in the cup. This object and others Will be made apparent in the following speciiication and claims, taken in connection with the accompanying drawings, in which- Figure l is an axial section of a grease cup having a grease plug embodying one forni of my invention. Fig. 2 is an elevation (partly in section) of a modification. Fig. 3 is an end view 'of the plug shown in Fig. 2. Figs. et and 5 are, respectively, an end elevation. and end view of another niodiiieation. Figs. 6, 7 and 8 are, respeetirely, an. elevation, end view and perspective view of a fourth torni. Figs. 9 and 10 are, re-

spectively, longitudinal sections and end views of a itli forni. Fig. "ll is a bottoniI end view oi' a bushing which may be used with an ordinary grease plug and grease cup; and Fig. 12 is an axial section or" the same.

In lubricating machinery. with more or less solid lubricants or greases, it'is common to' have a grease cup, which is represented by the reference numeral 17, having nipple 18 adapted to be connected to a duct leading to theY part to be lubricated. This cup is closed by a plug 16. The parts described thus far are old in the art. The plug 1G nia close the cup 17 by having a screw threaded engagement therewith, or with a bushing as shown in F ig. l. ln such case the top end l5 of the plug is preferablyy squared to permit the application of a To save weight and material the plug li may preferably he made hollow.

Considerable diiiiculty has been experienced Y with grease plugs on account of their tendency to become looseby jarring.

My invention consists in so modifying an ordinary grease plug as'to lprevent it from becoming detached from the grease cup.

Broadly speaking, niy invention consists in so extending 'the surface of the end of the grease plug in contact with the grease tliatthere/sliall be a considerable area of Contact, whereby the grease will hold the plug from escaping. n

Ot the many forms which my invention may take I have illustrated -a few in the accompanying drawings, throughout which the reference numeral l2) represents the ordinary flat end. of the grease plug. In Figs. and 3 this is extended in the form of a rib or vane 20 which is surrounded by the grease 20a. In Fig. Lthe end surface 19 is increased by a conical projection 21. ln Figs.'

4 and 5 the surface in Contact with the grease is increased by cutting short longitudinal channels .22 around the sides of the plug 16. In (i, 7 and 8 a vane 25 has one end 2 adapted to receive a pivot pin 24 which also engages a pinjeet'ion 23 from the-end surface 1.9. This vane isoblique as 1s shown clearly in Fig. 8, the inclination being such that when the plug is'beingv screwed into the grease cup the vane 25 rides upon the grease, but as lsoon as the plug starts to unscrew Athe vane 25 digs down into the grease thus engaging it and thereby preventing the 'escape of the plug. In Figs. 9 and l0 a recess 27 extends into the end-19 of the pliigthus increasing the sur- .face in Contact with the grease. This recess and come in contact with the sides of the externally screw threaded cylindrical grease plug which may bescrewed down inv engagement with the internal screw threads 3l. rlliisbushing. in combination with the foim ofplug illustrated in Fig. l, is rei-y ei'lective. The bushing 2Q when screwed into a grease cup serves to provide the latter with interior longitudinal grooves, mentioned in seine of the following claims. l't is obvious that the gr 'se cup might be constructed integrally with suoli grooves, thus doing away with the necessity for the busliing. When thus' combined, the grease is forced along the grooves 3Q and fills into the I ing screw threaded engagement therewith,

an extended area to comein Contact `with space behind the conicalprojection 21. The combination of a grease cup and plug with this form of bushing is shown in Fig. 1.

Many more forms of my invention might readily be devised in View of the'disclosure herein given, but it is thought that this'will be suiieient to illustrate the principle involved. The adhesion of the grease'to'- the end of the grease plug or the stiffness of the grease, or both o'f these properties, are taken advantage of to prevent the escape ofthe plu either by rotation thereof or by direct wit drawal.

I claim: y

' l. In combination, a grease cup and a grease plug litting Within said cup and havsaid grease cup being `provided with interior longitudinal grooves with the ends of said grooves adjacent to said plug.

2. In combination, a grease cup having interior screw threads, a grease plug having exteriorscrew threads engaging said cup,

terior longitudinal grooves cutting across said screwvthreads.

3. In combination, a grease cup, a grease plug having screwv threaded engagement with the grease cup, and having on its' en d the grease, said grease cup being provided thereto by its smaller base,

y my naine.

with longitudinal interior groovesY adapted to permit the grease toflow'up around the extended end of the grease plug. f

` 4. In combination, a grease cup, a grease plug -having screwv threaded engagement therewith, a frusto-conical projection on the inner end of the grease plug, being joined grease cup` being provided with longitudinal grooves inthe inner Wall of the grease cup.Y

5. In combination, a grease Cup and grease plug itt/ing within said cup and have ing screw threaded engagement therewith, said grease cup being provided with interior longitudinal grooves with the ends of al u and vsaid ,saidv grooves adjacent to` said plug, and

means acting between the plug and the u, i;"rooves provided in the cup to prevent rotation of the plug relatively to the cup.

6. Incombi'nation, a grease cup having interior screw threads, an interiorly and exteriorly screw threaded bushing therein, said'bushing having longitudinal grooves `onthel inside thereof, and a screw plug enga ing said bushing.

n testimonywhereof, I have Vsubscribed OTIS N. TERRY.

Witnesses: v

' LrLLIAN A. KIBBY,

ANNIE C. COURTENAY.

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