USRE27998E - Lubricated bearing assembly and method of making same - Google Patents

Lubricated bearing assembly and method of making same Download PDF

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USRE27998E
USRE27998E US27998DE USRE27998E US RE27998 E USRE27998 E US RE27998E US 27998D E US27998D E US 27998DE US RE27998 E USRE27998 E US RE27998E
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oil
wicking material
bearing
window
sleeve bearing
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/103—Construction relative to lubrication with liquid, e.g. oil, as lubricant retained in or near the bearing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings

Definitions

  • a self-lubricating sleeve bearing assembly having a lubricant reservoir surrounding the sleeve bearing with a window in the sleeve bearing for communicating the lubricant reservoir with the bearing surface.
  • a felt contactor plug is positioned in the reservoir with a portion thereof extending into the window.
  • An oil-impregnated wicking material fills the remainder of the reservoir and is molded about the contactor plug.
  • This invention relates to sleeve bearing assemblies having reservoirs containing an oil-impregnated wicking material, and more particularly it relates to a bearing assembly designed to prevent the solid particles of the wicking material from being drawn onto the bearing surface.
  • wicking material An injectable wicking material known to the art is discussed in my U.S. Patent No. 2,966,459, granted Dec. 27, 1960.
  • the wicking material itself comprises very short cellulose fibers derived from comminuted wood-based paper stock, and is impregnated with any one of the wide variety of suitable bearing lubricating oils.
  • the oil-impregnated wicking material is injected under pressure into a cavity adjacent to a sleeve bearing.
  • the sleeve bearing has an opening therein, often referred to in the art as a window, which communicates with the cavity containing the injected wicking material.
  • the shaft rotates in the sleeve bearing, it draws oil from the wicking material fibers.
  • this drawing effect of the rotating shaft has a tendency to draw the wicking material ⁇ libera themselves through the window of the sleeve bearing and deposit them on the surface of the bearing.
  • Window erosion does not present particularly significant problems.
  • window erosion even the possibility of window erosion cannot be tolerated.
  • FIG. 1 is an end view of the bearing assembly with associated supports
  • FIG. 2 is an enlarged sectional view taken along the lines 2-2 in FIG. l;
  • l FG. 3 is a reduced sectional view taken along the lines 3 3 of FIG. 2; and l FIG. 4 is an exploded view of the bearing sleeve and contactor plug.
  • an end bell 5 for an electric motor or the like having a sleeve bearing assembly 8 supported by radial arms 6 in a conventional manner.
  • the end bell 5 is equipped with a detachable access plate 7.
  • a motor shaft 10 is shown extending through sleeve bearing 9 of the bearing assembly 8.
  • the sleeve bearing 9 is held in position by an inner annular member 11 which is secured to an outer annular wall 12 of the bearing assembly by radial arms 13.
  • Both sleeve bearing 9 and annular member 1l have aligned openings or windows 14 and 20 therein to accommodate a contactor plug 15.
  • a projecting portion of the contactor plug extends through the windows 14 and 20 and slidably contacts the shaft.
  • the main body of the contactor plug is contained ⁇ within a cavity 16 defined by the annular Wall 12. One end of the cavity 16 is closed by a plate 17 which is fastened to the end of the annular wall 12.
  • the other end of the cavity 16 is closed by a washer-shaped cover 22 through which the motor shaft 10 extends.
  • the cavity 16 is filled with the oil-impregnated wicking material 24 which may be injected under pressure into the cavity 16 by any suitable means.
  • a thrust washer 26 and oil slinger 28 are provided with the oil slinger fixed to the shaft 10 to rotate therewith and sling the oil escaping from the end of the sleeve bearing adjacent thereto radially outward into the annulus of wicking material 24 overlying the oil slinger. This provides a conventional closed recirculating system which prevents oil from escap ing from the bearing assembly.
  • the contactor plug 15 is T-shaped to insure that it will not slip through the lwindows 14 and 20.
  • the projecting end of the contactor plug has a cross section which is substantially the same as the size of the windows 14 and 20 so that itfeffectively seals the windows in a manner to prevent the wicking material 24 from escaping therethrough;
  • the shaft rotates, it draws oil from the contactor plug 15 onto the shaft surface and the surface of the bearing.
  • the contactor plug in turn draws oil from the wicking material 24- which is intimately molded thereabout.
  • the presence of the contactor plug in the windows prevents any of the solid matter contained in the oil-impregnated wicking material from passing through the window, thus substantially eliminating the problem of window erosion discussed above.
  • the oil escaping from both ends of the sleeve bearing is recirculatedtback into the wicking material in a conventional manner.
  • the particular wicking material to be employed in the present invention may be of the type disclosed in my ealjlier U.S ⁇ . Patent 2,966,459, in which the oil-absorbing portion of the wicking material comprises comminuted .cellu- ⁇ lose fibers derivedV from'wood-based paper stock. If de-V sired, the novel wicking material disclosed in my copending applicationY Ser. No. 619,312, filed Feb. 2B, 1967 now U.S. Patent No. 3,466,244 wherein the oil-absorbing por; tion of the wicking material comprises cotton linter fibers can be used.
  • the contactor plug 15 be made of what has become known to the art as an F-S felt, which is denser or more tightly matted that the well known F-12 felt which is commonly used for lubricating sleeve bearings.
  • the contactor plug made of F-S felt throttles the ow of oil to the bearings so that the oil feed rate from oil-impregnated cotton linters is between that produced by cotton linters and wood fibers when no contactor plug is present.
  • the oil with which the wicking material is impregnated forms no part of the present invention, and can be selected from a long list of oils known to those skilled in the art to be suitable for lubrication of bearings.
  • the end bell can be clamped in an indexing table of existing machinery for injecting the aforementioned patented wicking material, and the contactor plug 15 can be inserted into the window of the sleeve bearing by a suitable tool at one station of the table. After the contactor plug has been placed into position, the cavity 16 may be filled with the wicking material at a second station of the machine.
  • the oil-impregnated wicking material may be injected into the cavity 16 from one end thereof, rather than through the windows 14 and 20, as is presently being done by electric motor manufacturers, by the same extrusion machinery now being used lo extrude or inject the wicking material of my aforementioned patent, and the methods disclosed in my earlier U.S. Patents 3,226,801, granted Jan. 4, 1966 and 3,273,- 688, granted Sept. 20, 1966.
  • a bearing assembly comprising a sleeve bearing having a window therein, a contactor plug having a portion thereof projecting into said window, housing means for supporting said bearing and defining a chamber around said bearing and contactor plug, and an oil-impregnated wicking material substantially filling said chamber and molded into intimate engagement with said contactor plug, said oil-impregnated wicking material comprising a fluent mixture of oil and oil retaining particles, the majority of said particles having a maximum dimension of about two millimeters or less, whereby said contactor plug retains solid particles from said wicking material from passing through said window while permitting the oil from said wicking material to pass therethrough] [2.
  • a bearing assembly comprising a sleeve bearing having a window therein, a contactor plug having lower and upper portions, said lower portion being press tit in said window in position to contact a shaft member to be journaled in said sleeve bearing, and housing means for supporting said sleeve bearing and defining a chamber about said bearing and contactor plug, an oil-impregnated wicking material substantially filling said chamber and molded into intimate engagement with said upper portion of said contactor plug, said oil-impregnated wicking material comprising a uent mixture of oil and oil retaining particles, the majority of said particles having a maximum dimension of about two millimeters or less, whereby said contactor plug retains solid particles from said wicking material from passing from said chamber through said window while permitting the oil from said wicking mate- Iiil to pass therethrough.;
  • a bearing assem- Y Ybly comprising a sleeve bearing having a window therein
  • a contactor plug having lower and upper portions, said lower portion being in said window in position to contact a shaft member to be iournaled in said sleeve bearing, and housing means for supporting said sleeve bearing and defining a chamber about said bearing and contactor plug.
  • an oil-impregnated wicking material substantially filling said chamber and molded into intimate engagement with said upper portion of said contactor plug, said oil-impregnated wicking material comprising a fluent mixture of oil and oil retaining particles, the majority of said particles having a maximum dimension of about two millimeters or less, whereby said contactor plug retains solid particles from said wicking material from passing from said chamber through said window while permitting the oil from said wicking material to pass therethrough, wherein said oil-impregnated wicking ⁇ material comprises oil-impregnated cotton linter iibers and said contactor plug is made of a tightly matted felt material comprising means to throttle the oil feed rate to the bearing surface to less than the feed rute of said wicking material without said contactor plug.
  • a method of making a lubricated sleeve bearing assembly having a windowed sleeve bearing and a cavity surrounding said bearing adapted to receive an oil-impregnated wicking material comprising inserting a contactor plug into the window in said sleeve bearing, and thereafter injecting an oil-impregnated wicking material into said cavity under pressure to mold the material about the contactor plug and substantially till the cavity rwhereby said wicking material delivers oil to said contactor plug for lubricating the bearing surface of said sleeve bearing] 5.
  • a bearing assembly comprising a sleeve bearing having a window therein, a contactor plug having lower and upper portions, said lower portion being in said window in position to contact a shaft member to be journaled in said sleeve bearing, and housing means for supporting said sleeve bearing and dening a chamber about said bearing and contactor plug, an oil-impregnated wicking material of a predetermined feed rate greater than that of iniectable wood fiber wicking material, said oil impregnoted wicking material substantially filling said chamber and molded into intimate engagement with said upper por tion of said contactor plug, said oil-impregnated wicking material comprising a fluent mixture of oil and oil retaining particles, the majority of said particles having a maximum dimension of about two millimeters or less, said contactor plug being made of a tightly matted felt material comprising means to throttle the oil feed rate to the bearing surface to a rate between said predetermined feed rate and the feed rate of injectable wood fiber wicking material.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

A SELF-LUBRICATING SLEEVE BEARING ASSEMBLY HAVING A LUBRICANT RESERVOIR SURROUNDING THE SLEEVE BEARING WITH A WINDOW IN THE SLEEVE BEARING FOR COMMUNICATING THE LUBRICANT RESERVOIR WITH THE BEARING SURFACE. A FELT CONTACTOR PLUG IS POSITIONED IN THE RESERVOIR WITH A PORTION THEREOF EXTENDING INTO THE WINDOW. AN OIL-IMPREGNATED WICKING MATERIAL FILLS THE REMAINDER OF THE RESERVOIR AND IS MOLDED ABOUT THE CONTACTOR PLUG.

Description

M. L. ABEL April 3o, 1914 LUBRICATED BEARING ASSEMBLY AND METHOD OF MAKING SAME lll.
A ORNEYS United StatesPatent Office Re. 27,998 Reissued Apr. 30, 1974 27,998 LUBRICATED BEARING ASSEMBLY AND. METHOD F MAKING SAME Martin L. Abel, Franklin, Mich., assignor to Permawick Company, Inc., Detroit, Mich. Original No. 3,434,765, dated Mar. 25, 1969, Ser. No. 619,313, Feb. 28, 1967. Application for reissue Mar. 25, 1971, Ser. No. 128,135
Int. Cl. F16c 1/24, 13/02, 33/66 U.S. Cl. 308-132 2 Claims Matter enclosed in heavy brackets [1 appears in the original patent but forms no part of this reissue specilication; matter printed in italics indicates the additions made by reissue.
ABSTRACT OF THE DISCLOSURE A self-lubricating sleeve bearing assembly having a lubricant reservoir surrounding the sleeve bearing with a window in the sleeve bearing for communicating the lubricant reservoir with the bearing surface. A felt contactor plug is positioned in the reservoir with a portion thereof extending into the window. An oil-impregnated wicking material fills the remainder of the reservoir and is molded about the contactor plug.
This invention relates to sleeve bearing assemblies having reservoirs containing an oil-impregnated wicking material, and more particularly it relates to a bearing assembly designed to prevent the solid particles of the wicking material from being drawn onto the bearing surface.
An injectable wicking material known to the art is discussed in my U.S. Patent No. 2,966,459, granted Dec. 27, 1960. The wicking material itself comprises very short cellulose fibers derived from comminuted wood-based paper stock, and is impregnated with any one of the wide variety of suitable bearing lubricating oils. In a typical application of the wicking material, the oil-impregnated wicking material is injected under pressure into a cavity adjacent to a sleeve bearing. The sleeve bearing has an opening therein, often referred to in the art as a window, which communicates with the cavity containing the injected wicking material. As the shaft rotates in the sleeve bearing, it draws oil from the wicking material fibers.
In some bearing applications, this drawing effect of the rotating shaft has a tendency to draw the wicking material `libera themselves through the window of the sleeve bearing and deposit them on the surface of the bearing. Normally this tendency, referred to in the art as Window erosion, does not present particularly significant problems. However, in some more demanding bearing applications, even the possibility of window erosion cannot be tolerated.
It is accordingly one object of this invention to provide an improved sleeve bearing assembly in which the phenomenon of window erosion is substantially eliminated.
It is another object of this invention to provide an improved sleeve bearing assembly which avoids the problem of window erosion, and yet delivers sufficient oil to the bearing for adequate lubrication.
It is a further object of the present invention to provide an improved bearing assembly with the above advantages which can easily andfetciently be assembled in an automated operation.
Other objects and features of novelty of the invention will become apparent to one skilled in the art when referring to the following description, taken inconjunction with the accompanying drawings, wherein FIG. 1 is an end view of the bearing assembly with associated supports;
FIG. 2 is an enlarged sectional view taken along the lines 2-2 in FIG. l;
l FG. 3 is a reduced sectional view taken along the lines 3 3 of FIG. 2; and l FIG. 4 is an exploded view of the bearing sleeve and contactor plug.
Referring initially to FIG. 1, there is disclosed an end bell 5 for an electric motor or the like having a sleeve bearing assembly 8 supported by radial arms 6 in a conventional manner. The end bell 5 is equipped with a detachable access plate 7.
Referring to FIGS. 2.4, a motor shaft 10 is shown extending through sleeve bearing 9 of the bearing assembly 8. The sleeve bearing 9 is held in position by an inner annular member 11 which is secured to an outer annular wall 12 of the bearing assembly by radial arms 13. Both sleeve bearing 9 and annular member 1l have aligned openings or windows 14 and 20 therein to accommodate a contactor plug 15. A projecting portion of the contactor plug extends through the windows 14 and 20 and slidably contacts the shaft. The main body of the contactor plug is contained `within a cavity 16 defined by the annular Wall 12. One end of the cavity 16 is closed by a plate 17 which is fastened to the end of the annular wall 12. The other end of the cavity 16 is closed by a washer-shaped cover 22 through which the motor shaft 10 extends. The cavity 16 is filled with the oil-impregnated wicking material 24 which may be injected under pressure into the cavity 16 by any suitable means. A thrust washer 26 and oil slinger 28 are provided with the oil slinger fixed to the shaft 10 to rotate therewith and sling the oil escaping from the end of the sleeve bearing adjacent thereto radially outward into the annulus of wicking material 24 overlying the oil slinger. This provides a conventional closed recirculating system which prevents oil from escap ing from the bearing assembly.
As best seen in FIGS. 2 and 4, the contactor plug 15 is T-shaped to insure that it will not slip through the lwindows 14 and 20. The projecting end of the contactor plug has a cross section which is substantially the same as the size of the windows 14 and 20 so that itfeffectively seals the windows in a manner to prevent the wicking material 24 from escaping therethrough; By injecting the oil-im pregnated wicking material 24 into the cavity 16 under pressure after the contactor plug has been positioned as shown, the wicking material accurately molds itself about the main body of the contactor plug 15 which protrude: from the windows 14 and 20.
As the shaft rotates, it draws oil from the contactor plug 15 onto the shaft surface and the surface of the bearing. The contactor plug in turn draws oil from the wicking material 24- which is intimately molded thereabout. The presence of the contactor plug in the windows prevents any of the solid matter contained in the oil-impregnated wicking material from passing through the window, thus substantially eliminating the problem of window erosion discussed above. As previously described, the oil escaping from both ends of the sleeve bearing is recirculatedtback into the wicking material in a conventional manner.
The particular wicking material to be employed in the present invention may be of the type disclosed in my ealjlier U.S`. Patent 2,966,459, in which the oil-absorbing portion of the wicking material comprises comminuted .cellu-` lose fibers derivedV from'wood-based paper stock. If de-V sired, the novel wicking material disclosed in my copending applicationY Ser. No. 619,312, filed Feb. 2B, 1967 now U.S. Patent No. 3,466,244 wherein the oil-absorbing por; tion of the wicking material comprises cotton linter fibers can be used. The majority of the bers of the oil-impreg nated wicking material of both of my aforementioned [earlier patent and copending application] patents are about two millimeters or less in length, as clearly brought out in the [specification of my patent and application] specifications thereof. It is because of these relatively short length bers that the window erosion problem arises. However, the term oil-impregnated wicking material as used in the specification and claims is not to be construed as limited to wicking materials in which the oil-absorbing portion of the material is bers. This term is intended to include any uent oil-impregnated material in which oilabsorbing solids are present.
It is preferred that the contactor plug 15 be made of what has become known to the art as an F-S felt, which is denser or more tightly matted that the well known F-12 felt which is commonly used for lubricating sleeve bearings. The contactor plug made of F-S felt throttles the ow of oil to the bearings so that the oil feed rate from oil-impregnated cotton linters is between that produced by cotton linters and wood fibers when no contactor plug is present. The oil with which the wicking material is impregnated forms no part of the present invention, and can be selected from a long list of oils known to those skilled in the art to be suitable for lubrication of bearings.
As noted, one of the advantages of the present bearing assembly is that it is particularly adaptable to mass production techniques. The end bell can be clamped in an indexing table of existing machinery for injecting the aforementioned patented wicking material, and the contactor plug 15 can be inserted into the window of the sleeve bearing by a suitable tool at one station of the table. After the contactor plug has been placed into position, the cavity 16 may be filled with the wicking material at a second station of the machine. Specifically, the oil-impregnated wicking material may be injected into the cavity 16 from one end thereof, rather than through the windows 14 and 20, as is presently being done by electric motor manufacturers, by the same extrusion machinery now being used lo extrude or inject the wicking material of my aforementioned patent, and the methods disclosed in my earlier U.S. Patents 3,226,801, granted Jan. 4, 1966 and 3,273,- 688, granted Sept. 20, 1966.
What is claimed is:
[1. A bearing assembly comprising a sleeve bearing having a window therein, a contactor plug having a portion thereof projecting into said window, housing means for supporting said bearing and defining a chamber around said bearing and contactor plug, and an oil-impregnated wicking material substantially filling said chamber and molded into intimate engagement with said contactor plug, said oil-impregnated wicking material comprising a fluent mixture of oil and oil retaining particles, the majority of said particles having a maximum dimension of about two millimeters or less, whereby said contactor plug retains solid particles from said wicking material from passing through said window while permitting the oil from said wicking material to pass therethrough] [2. A bearing assembly comprising a sleeve bearing having a window therein, a contactor plug having lower and upper portions, said lower portion being press tit in said window in position to contact a shaft member to be journaled in said sleeve bearing, and housing means for supporting said sleeve bearing and defining a chamber about said bearing and contactor plug, an oil-impregnated wicking material substantially filling said chamber and molded into intimate engagement with said upper portion of said contactor plug, said oil-impregnated wicking material comprising a uent mixture of oil and oil retaining particles, the majority of said particles having a maximum dimension of about two millimeters or less, whereby said contactor plug retains solid particles from said wicking material from passing from said chamber through said window while permitting the oil from said wicking mate- Iiil to pass therethrough.;
3. [The bearing assembly of claim 2] A bearing assem- Y Ybly comprising a sleeve bearing having a window therein,
a contactor plug having lower and upper portions, said lower portion being in said window in position to contact a shaft member to be iournaled in said sleeve bearing, and housing means for supporting said sleeve bearing and defining a chamber about said bearing and contactor plug. an oil-impregnated wicking material substantially filling said chamber and molded into intimate engagement with said upper portion of said contactor plug, said oil-impregnated wicking material comprising a fluent mixture of oil and oil retaining particles, the majority of said particles having a maximum dimension of about two millimeters or less, whereby said contactor plug retains solid particles from said wicking material from passing from said chamber through said window while permitting the oil from said wicking material to pass therethrough, wherein said oil-impregnated wicking `material comprises oil-impregnated cotton linter iibers and said contactor plug is made of a tightly matted felt material comprising means to throttle the oil feed rate to the bearing surface to less than the feed rute of said wicking material without said contactor plug.
[4. A method of making a lubricated sleeve bearing assembly having a windowed sleeve bearing and a cavity surrounding said bearing adapted to receive an oil-impregnated wicking material comprising inserting a contactor plug into the window in said sleeve bearing, and thereafter injecting an oil-impregnated wicking material into said cavity under pressure to mold the material about the contactor plug and substantially till the cavity rwhereby said wicking material delivers oil to said contactor plug for lubricating the bearing surface of said sleeve bearing] 5. A bearing assembly comprising a sleeve bearing having a window therein, a contactor plug having lower and upper portions, said lower portion being in said window in position to contact a shaft member to be journaled in said sleeve bearing, and housing means for supporting said sleeve bearing and dening a chamber about said bearing and contactor plug, an oil-impregnated wicking material of a predetermined feed rate greater than that of iniectable wood fiber wicking material, said oil impregnoted wicking material substantially filling said chamber and molded into intimate engagement with said upper por tion of said contactor plug, said oil-impregnated wicking material comprising a fluent mixture of oil and oil retaining particles, the majority of said particles having a maximum dimension of about two millimeters or less, said contactor plug being made of a tightly matted felt material comprising means to throttle the oil feed rate to the bearing surface to a rate between said predetermined feed rate and the feed rate of injectable wood fiber wicking material.
References Cited The following references, cited by the Examiner, are
of record in the patented tile of this patent or the original patent.
UNITED STATES PATENTS 3,184,272 5/1965 Ridgway, Jr. 308-132 2,945,729 7/ 1960 Mitchell 308-132 2,123,872 7/1938 Whiteley 308-132 2,960,371 11/1960 Staal: 308-132 2,966,459 12/1960 Abel 252-14 3,140,128 7/1964 Tann 308-240 3,224,819 12/1965 Hunt 308-132 3,235,317 2/1966 Cunninham 308-132 3,030,157 4/1962 Dedcrich 308-132 CHARLES I. MYHRE, Primary Examiner F. SUSKO, Assistant Examiner
US27998D 1971-03-25 1971-03-25 Lubricated bearing assembly and method of making same Expired USRE27998E (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5098206A (en) * 1988-08-25 1992-03-24 Interelectric Ag Shaft bearing assembly for a miniature electric motor
US11193541B1 (en) * 2020-06-11 2021-12-07 Curtis Collins Hassell Self-lubricating SLZ-type tow dolly assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5098206A (en) * 1988-08-25 1992-03-24 Interelectric Ag Shaft bearing assembly for a miniature electric motor
US11193541B1 (en) * 2020-06-11 2021-12-07 Curtis Collins Hassell Self-lubricating SLZ-type tow dolly assembly

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