USRE20291E

USRE20291E - Magnetic plug

Info

Publication number: USRE20291E
Authority: US
Inventors: Albert E. Bock
Filing date: 1932-02-20
Publication date: 1937-03-09

Description

March 9, 1937. A. E. BOCK 1 Re. 20,291 MAGNETIC PLUG Original Fileci Feb. 20, 1952 Inventor Reissued Mar. 9 1937 UNITED STATES mcns'nc PLUG.

Albert E. Bock, White Clay, Nebn, asaignor to Hale Corporation, Clarinda, Iowa, a corporation of Iowa Original No. 1,944,208, January 23, 1934, Serial No. 594,251, February 20, 1932.

Application i'orrelssne December 16, 1935, Serial No. 54.792

ZCIaims.

This invention relates to the art of collecting. for subsequent removal of the ferrous, debris which becomes commingled with the lubricant within power transmission housings, incidents to the wear of the moving parts or gears contained in said housing.

It is a particular object of the invention to provide a removable device for the drain plug openings of ferrous power transmission housings, the magnetic portion of the device to be spaced away from and out of contact with the ferrous housing so that the latter will not affect the influence of the magnet and prevent the most advantageous operation of the device.

A further object of the invention is to provide means whereby the magnetic core of the device may be readily, and .economically secured in its carrying shell of non-magnetic material.

Other and further objects and advantages of the invention will be understood from the following detailed description reference being had to the accompanying drawing forming a part thereof and in which:

Figure l is a. sectional view of a fragment of a power transmission housing or gear case and showing the new device applied to the drain plug opening thereof.

Figure 2 is a side elevation P ug.

Figure 3 isa top plan view thereof.

Figure 4 is a side elevation of a magnetic core employed.

Figure 5 is a top plan view of the core shown in Figure 4.

Figure 6 is a side elevation of the central porof the new drain tionof a diii'erential gear-housing and showing the new device applied thereto.

Figure 7 is a vertical section of a removable cover plate for the housing shown in Figure 6 and illustrating the applicability of the new device to the plate.

Referring now to the drawing for a more par-- ticular description, Ill indicates the bottom of a power transmission housing gear case or the like and II a threaded'opening'thereof which is provided for the purpose of draining refuse 'lubricant and debris from the interior of said I5 at the end of the shell opposite to said nut. As thus described it will be understood that an annular rim I6 is thus disposed concentrically about the opening it.

A magnetic cylindrical core I1 is employed which in diameter is substantially equal to the diameter of the recess ll.

The core I1 is provided with a bifurcated end.-

whereby a north pole I8 and a south pole. is is formed, similar to well known horse shoe magnets.

An annular groove 20 is provided for purposes later described in the wall of the core.

The shell I2 is preferably formed of brass by casting, and as a result thereof the annular wall surrounding the recess I5 is rugose.

The magnetic core is preferably formed of tungsten metal or the like and preferably cut from elongated cylindrical rods of said material, the, annular side wall, of the core ll being rough and unfinished.

ably a second portion of the rim IS an opposite,

to the member 2| is peened into the groove 20 as indicated at 22. The second tongue 22 may be dispensed with in instances where a close fit is provided between the core and the interior of the shell. It will be understood that it is essential to rigidly and securely lock the core and the shell together whereby the core will be prevented from moving away from the shell and. intermlngling with the moving gears within the transmission housing.

In operation the new device when placed in a drain opening of a housing will attract and detain particles of metal contained within the lubricant of the housing as indicated at 23 and it will be noted that the magnetic core I1 is not in direct contact with the housing, being spaced therefrom by means of the non-magnetic shell l2 which is positioned between the core and the housing.

It will be understood that the new device is applied to the bottom of a transmission housing and 'may be applied to a rear axle housing, as shown in Figures 6 and 'I.

From the foregoing description it is thought to be obvious that a magnetic grease plug constructed in accordance with my invention is particularly well adapted for use by reason or the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention is susceptible of some change and modification without departing from the principles and spirit thereof and for this reason I do not .wish to be understood as limiting myself to the precise arrangement andformation of the several parts herein shown in carrying out my invention in practice except as herein claimed.

I claim:

LA drain plug for power transmission housings and the like having a threaded drain open- I ing therein, comprising anon-magnetic shell exteriorly threaded 'for engagement in a transmission housing drain opening and having an integral nut on its outer end for turning the shellto remove and position the same, said shell having a recess in its inner end opposite said nut providing an annular rim on the shell adapted to project through and beyond the opening in .the

transmission housing, a magnetic core fitting in the recess in the shell. said core having a bifurcated projecting end extending beyond the shell and providing opposite poles for the core and having an annular exterior groove in register with the projecting end of the shell, said rim having an inwardly offset portion projecting into said groove for interlocking the core in the shell.

2. A drain plug for power transmission housings and the like having a threaded drain open-' ing therein, comprising a shell exteriorly threaded for engagement in a transmission housing drain opening and having an integral nut on its outer end for turningthe shell to remove and position the same relative to said drain opening,

said shell having arecess in its inner end oppo site said nut. a bifurcated magnetic core within said recess in said shell,-the plug being of nonmagnetic material. and an interlocking connection between the bifurcated portion of the magnet and the portion of the shell encircling the bicurcated portion of the magnet.

' ALBERT E. BOCK.