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Publication numberUS820508 A
Publication typeGrant
Publication dateMay 15, 1906
Filing dateNov 18, 1905
Priority dateNov 18, 1905
Publication numberUS 820508 A, US 820508A, US-A-820508, US820508 A, US820508A
InventorsFrederick Leonhardt
Original AssigneeFrederick Leonhardt
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Sight-feed lubricator.
US 820508 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

PATBNTED MAY 15, 1906.




Specification of Letters Patent.

Patented May 15, 1906.

Application led November 18, 1905. Serial No. 287,932.

T0 all whom, it may concern,.-

Be it known that I, FREDERICK LEON- HARDT, a citizen of the United States, and a resident of Sheboygan, in the county of Sheboygan and State of Wisconsin, have invented certain new and useful Improvements in Sight-Feed Lubricators, and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention consists in certain peculiarities of construction and combination of parts hereinafter set forth with reference to the accompanying drawings and subsequently claimed, its object being to provide against fracture of glass in sight-feed tubes of lubricators and in case of fracture to prevent particles of glass from flying, as well as to facilitate the substitution of one such tube for another in a lubricator and to avoid the necessity of exact measurements with respect to the dimensions of the substitute tube.

Figure 1 of the drawings represents a fragment of an improved lubricator partly in section, and Fig. 2 an elevation of the sight-feed tube of the lubricator partly broken away.

Referring by letter to the drawings, A indicates the oil-reservoir, and B C the feed-tube holders, of a lubricator. The upper tubeholder B is closed at the top by a screw-plug D, and a packing-ring Eis compressed against the lower end of said holder by a sleeve-nut F, run on an exterior thread of same. A similar ring G is compressed against the upper end of the lower tube-holder C by a sleevenut H, run on an outer thread of said holder, and by means of said packing-ring and nuts the sight-feed tube is made fluid-tight in both holders for the same.

The sight-feed tube comprises an outer metallic jacket I, of cylindrical form, interiorly screw-threaded at its ends and provided with apertures b midway of its length, a glass shell J in the jacket visible through the apertures of same, packing-gaskets K, opposing the ends of the shell, and hollow nuts L run in said jacket against the gaskets, shanks c of the nuts being extended through said gaskets to bush the same and project into said shell. Particular attention is called to the fact that the glass shell, packing-gaskets, and nuts of the sight-feed tube are wholly within the outer jacket portion of said tube, so as to preclude the possibility of undue pressure on said shell longitudinally of the same, and the position of said tube in practice is such that there is no bind upon its To position the sight-feed tube, as partof the lubricator, the` screw-plug D of the tube-holder B is removed and the sleevenuts F H loosened, after which said tube is dropped into place, said nuts tightened, and said plug put back in said holder. The bind of the packing-rings F G is circumferentially of the outer metallic jacket portion of the sight-feed tube, and the length of this tube as a whole is immaterial so long as it is made to extend in opposite directions through said rings. Hence accuracy of length of the sight-feed tube with reference to the distance between the tube-holder of a lubricator is not essential, and it has been explained how an otherwise too short a tube maybe lengthened.

It is to be noted that one end of the sightfeed tube is free in the remainder of the lubricator, and thus said tube is unimpeded as to longitudinal expansion, this being an important feature of my invention.

To compensate for expansion and contraction, the glass shell of the sight-feed tube is of sufficiently less diameter than the jacket, in which it is made fluid-tight 'by the packinggaskets and nuts aforesaid, and the expansion and contraction of said jacket and that of the tube-holders is never detrimental to said glass shell. However, should there be a fracture of the aforesaid shell the jacket for the same will prevent the flight of particles of glass. As herein shown, the glass shell may be comparatively short, and this of itself tends to lessen the liability of said shell to fracture under the conditions to which it is exposed when the lubricator is in service.

It is a very simple matter to remove an unserviceable sight-feed tube and substitute a newone of the construction aforesaid regardless of accuracy as to the length of said new tube, provided it is long enough to extend through both of the packing-rings aforesaid when dropped in through the upper tubeholder from which the screw-plug closure is temporarily removed.



I claim-- 1. A sight-feed tube Jfor a lubricator comprising an outer metallic jacket having the ends thereof interiorly screw-threaded7 a glass shell Within the jacket visible through apertures in the same, packing-gaskets opposing ends of the shell, and hollow nuts that engage the screw-threads of said jacket against the gaskets and have hollow Shanks extending through said gaskets to bush the same and project into said shell.

- 2. A lubricator having packing-rings opposing ends of its feed-tube holders, sleevenuts in connection with said holders against the packing-rings, and a sight-feed tube comprising an outer metallic jacket extending in opposite directions through said rings and FREI). LEONHARDT.


Referenced by
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US5522474 *Oct 7, 1994Jun 4, 1996Burman; Jerry L.Apparatus and method for changing automatic transmission fluid
Cooperative ClassificationF16N29/00