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GB2269427A - Bearing assembly - Google Patents

Bearing assembly Download PDF

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Publication number
GB2269427A
GB2269427A GB9315964A GB9315964A GB2269427A GB 2269427 A GB2269427 A GB 2269427A GB 9315964 A GB9315964 A GB 9315964A GB 9315964 A GB9315964 A GB 9315964A GB 2269427 A GB2269427 A GB 2269427A
Authority
GB
United Kingdom
Prior art keywords
bearing assembly
bush
assembly according
housing members
mounting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9315964A
Other versions
GB9315964D0 (en
Inventor
Jonathan Michael Howa Layfield
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meritor Heavy Vehicle Systems Ltd
Rubery Owen Rockwell Ltd
Original Assignee
Ror Rockwell Ltd
Rubery Owen Rockwell Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB898927639A external-priority patent/GB8927639D0/en
Application filed by Ror Rockwell Ltd, Rubery Owen Rockwell Ltd filed Critical Ror Rockwell Ltd
Priority to GB9315964A priority Critical patent/GB2269427A/en
Publication of GB9315964D0 publication Critical patent/GB9315964D0/en
Publication of GB2269427A publication Critical patent/GB2269427A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/02—Sliding-contact bearings
    • F16C23/04—Sliding-contact bearings self-adjusting
    • F16C23/043—Sliding-contact bearings self-adjusting with spherical surfaces, e.g. spherical plain bearings
    • F16C23/045—Sliding-contact bearings self-adjusting with spherical surfaces, e.g. spherical plain bearings for radial load mainly, e.g. radial spherical plain bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
    • B60T1/06—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels
    • B60T1/067—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels employing drum
    • 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
    • F16C33/08—Attachment of brasses, bushes or linings to the bearing housing
    • 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
    • F16C33/72—Sealings
    • F16C33/74—Sealings of sliding-contact bearings
    • 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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
    • 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
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/45—Brakes
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/22—Mechanical mechanisms converting rotation to linear movement or vice versa acting transversely to the axis of rotation
    • F16D2125/28—Cams; Levers with cams
    • F16D2125/30—Cams; Levers with cams acting on two or more cam followers, e.g. S-cams
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/44—Mechanical mechanisms transmitting rotation
    • F16D2125/56—Shafts for transmitting torque directly

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Mounting Of Bearings Or Others (AREA)

Abstract

A bearing assembly (1) for a brake actuating shaft (16) for a vehicle axle comprises a bush (11) having a part-spherical outer periphery (12) and a bore to receive the shaft, and housing members (2, 3) secured about the bush and having inner surfaces co-operating with the bush to hold and locate it whilst allowing tilting of the bush relatives thereto. A locating member (21) engaging an annulus (15) at the bore and an annulus (19) of the shaft locates the shaft axially in the bush. One or more protrusions (7) of one housing member (3) locate against a surface or surfaces of a mounting (6) to locate the assembly radially on the mounting, and to enable the assembly to react a radial force on the shaft by transmitting a proportion of the force to the mounting at the protrusion, or one of the protrusions. <IMAGE>

Description

BEARING ASSEMBLIES This invention relates to bearing assemblies and, more particularly, though not exclusively, to a bearing assembly for a brake actuating shaft for a vehicle axle.
An axle, for example for a trailer vehicle, comprises an axle beam having a hub at each end. The hubs are rotatably mounted on bearings and, adjacent to each hub, there is a brake assembly. Each brake assembly comprises a brake anchor bracket secured to the axle beam, as by welding or bolting, and carrying two opposed brake shoes which are pivotally mounted at one end on anchor pins and at the other end bear on a brake actuating mechanism. The brake actuating mechanism comprises a shaft (the camshaft) having a cam on its outboard end and which is spaced from and lies parallel to the axle beam, rotatably mounted in an outboard bearing assembly at the anchor bracket and in an inboard bearing assembly adjacent to the inboard end of the camshaft. The inboard bearing assembly is mounted on the axle beam.One end of a lever is fitted to the camshaft at its inboard end and the other end of the lever is connected to a brake actuator, operated, for example, by compressed air, to rotate the camshaft to cause the brake shoes to be expanded to engage a brake drum carried by the hub. Expansion of the brake shoes is effected by the cam, for example an S-cam, on the outboard end of the camshaft which acts on the other ends of the brake shoes via rollers mounted thereon.
This invention provides a novel bearing assembly which, inter alia, may be used as the outboard bearing for the camshaft on an axle such as has been described.
The bearing assembly may be required to react a radial force applied to the shaft (such as is the case when the shaft is an S-cam brake shaft).
According to the present invention a bearing assembly comprises in combination a bush having a cylindrical bore and a part-spherical outer periphery, and opposed housing members secured, or adapted to be secured, together having inner surfaces shaped to co-operate with the outer periphery of the bush so as to hold and locate the bush whilst allowing tilting of the bush within the assembled housing members, at least one of the housing members being formed to provide for axial and radial location of the assembly on or in a mounting there for.
The radial location of the bearing assembly may be provided by one or more, preferably three equi-spaced, protrusions on one of the housing members adapted to locate radially against a surface or surfaces of the mounting for. the assembly radially spaced from the central axis of the cylindrical bore, such that a proportion of the radial force is transmitted to the mounting through the protrusion, or one of the protrusions.
One embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 is a front elevation of a bearing assembly and a shaft, the latter being shown in section, Figure 2 is a side elevation of the bearing assembly and shaft of Figure 1, showing the bearing assembly in section, and Figure 3 is a scrap view in enlarged detail of part of Figure 2 showing a bearing surface of a housing member which co-operates with a bush of the bearing assembly.
Referring to Figures 1 and 2 of the drawings, a bearing assembly 1 includes two housing members which are shown as similar steel pressings 2, 3. The pressings each have an outer flange portion 4 with registering holes 5 whereby the assembly 1 can be secured, for example by bolts or like fastenings, to a mounting which is here shown (in part only) in Figure 2 as a brake anchor bracket 6. Inboard from the flange portions 4 the pressings 2, 3 have an axially extending portion which inciudes three equi-spaced protrusions 7 joined by and alternating with three part-spherical portions 8. The protrusions 7 and portions 8 merge to extend axially a short distance and then radially inwardly to provide housings for O-ring seals 9.
A bearing bush 11 has a cylindrical bore 11' and a part-spherical outer periphery 12 which co-operates with the complementary part-spherical portions 8 of the pressings 2, 3 which provide axial and radial location, and support, for the bush. The bush 11 has centrally located radial lubrication passages 14, provided as drillings, extending from its outer periphery 12 into a central annulus 15, which is in the form of a groove as seen in Figure 2. A shaft 16 is received in the bush 11.
The pressings 2, 3 each incorporate a small platform 17. The platform 17 of pressing 2 is drilled and tapped to receive a grease nipple 18 for injection of grease to lubricate the co-operating surfaces of the part-spherical portions 8 of the pressings and the outer periphery 12 of the bush 11 andr via the lubrication passages 14 and annulus 15, the co-operating surfaces of the bush 11 and shaft 16.
In an S-cam brake, rotation of the shaft 16 to expand the brake shoes against the brake drum gives rise to a bending force on the shaft, applied at the cam. Preferably the bearing assembly and its mounting are arranged so that a proportion of this bending force is reacted by the mounting through one of the protrusions 7. An axle such as has been described will have an S-cam brake at each end, one having a left hand cam and the other a right hand cam. Considering the bearing assembly as shown in Figures 1 and 2, the three equi-spaced protrusions 7 of the pressing 3 adjacent to the anchor bracket 6 locate in and abut radially against the peripheral wall surface 6' of an opening in the anchor bracket through which the shaft 16 extends.
When a bending force is exerted on the shaft at the cams a proportion of the bending force for the right hand camshaft will be reacted at the relevant bearing assembly by one of the three protrusions 7 of the one pressing 3 at the appropriate location bearing radially on the respective anchor bracket at the peripheral wall surface 6' of the opening, and a proportion of the bending force for the left hand camshaft will be reacted at the relevant bearing assembly by a protrusion 7 of its one pressing bearing radially at another of the locations on the anchor bracket with which that bearing assembly is associated.
The protrusions 7 centralise and radially locate the tearing assembly in the anchor bracket 6. Also, the flanges 4 locate the bearing assembly axially with respect to the anchor bracket 6.
For transport purposes the bearing assembly may be made by staking the pressings 2, 3, and the assembly is secured for use by bolting to a mounting.
The bush 11 may conveniently be made of sintered metal or of a plastics material. The housing members have been described as metal pressings. However, these also could be of sintered metal or of a plastics material. In the latter case the part-spherical housing for the bush, whether of sintered metal or of plastics material, may be continuous instead of the interrupted design provided by the spaced part-spherical portions 8 of the pressed members which have been described. Similarly, the protrusions 7 may be continuous instead of being interrupted.
Figure 3 is a scrap view on an enlarged scale showing a part-spherical bearing surface of the pressing 3 which co-operates with the outer periphery 12 of the bush ll, as seen at the top right of Figure 2.

Claims (14)

1. A bearing assembly comprising in combination a bush having a cylindrical bore and a part-spherical outer periphery, and opposed housing members secured, or adapted to be secured, together having inner surfaces shaped to co-operate with the outer periphery of the bush so as to hold and locate the bush whilst allowing tilting of the bush within the assembled housing members, at least one of the housing members being formed to provide for axial and radial location of the assembly on or in a mounting therefor.
2. A bearing assembly according to claim 7 wherein the housing members each have an outer flange portion at which they are secured, or adapted to be secured, together, and at which they are adapted to be secured to a mounting for the assembly to locate the assembly axially on or in the mounting.
3. A bearing assembly according to claim 2 wherein the outer flange portions of the housing members have registering holes whereby the housing members are secured together and can be secured to the mounting by means of bolts or like fastenings.
4. A bearing assembly according to any preceding claim wherein at least one of the housing members has an axially extending portion including one or more part-spherical portions complementary to and providing the inner surfaces which co-operate with the outer periphery of the bush.
5. A bearing assembly according to claim 4 wherein the said one housing member has three said part-spherical portions equi-spaced apart.
6. A bearing assembly according to any preceding claim wherein at least the said one housing member formed to provide for axial and radial location of the assembly on or in a mounting, has one or more protrusions adapted to locate radially against a surface or surfaces of the mounting radially spaced from the central axis of the cylindrical bore, the arrangement being such that in use of the assembly with a shaft entered into the bush a radial force applied to the shaft is reacted by the assembly by a proportion of the radial force being transmitted to the mounting through the protrusion, or one of the protrusions.
7. A bearing assembly according to claim 6 wherein there are three said protrusions equi-spaced around the central axis of the cylindrical bore.
8. A bearing assembly according to claim 7 as dependent from claim 5 wherein the three part-spherical portions are dispose between the three equi-spaced protrusions such that the part-spherical portions and protrusions alternate around the central axis of the cylindrical bore.
9. A bearing assembly according to any preceding claim wherein the housing members have portions shaped to provide housings adjacent to opposite ends of the cylindrical bore for O-ring seals applied to a shaft entered into the bush for use of the assembly.
10. A bearing assembly according to any preceding claim wherein one of the housing members has a platform which receives and locates a grease nipple for injection of grease to lubricate the outer periphery of the bush and co-operating inner surfaces of the housing members.
11. A bearing assembly according to claim 10 wherein the bush has lubrication passages extending from its part-spherical outer periphery into an annular groove in the bore of the bush.
12. A bearing assembly according to any preceding claim wherein the housing members are metal pressings.
13. A bearing assembly according to any preceding claim wherein the bush is made of sintered metal.
14. A bearing assembly according to any of claims 1 to 13 wherein the bush is made of a plastics material.
14. A bearing assembly according to any of claims 1 to 13 wherein the bush is made of a plastics material.
Amendments to the claims have been filed as follows 1. A bearing assembly comprising in combination a bush having a part-spherical outer periphery, a cylindrical bore and an annulus at the bore adapted to receive a locating member for axial location of a shaft in the bore for use of the bearing assembly, and opposed housing members which together contain the bush, the housing members being secured or adapted to be secured together, having inner surfaces comprising part-spherical portions shaped to be complementary to and co-operate with the outer periphery of the bush so as to hold and locate the bush axially and radially between the housing members whilst allowing tilting of the bush relative thereto, and at least one of the housing members having portions formed to co-operate in use of the bearing assembly with a mounting for the assembly to locate the assembly axially and radially in or on the mounting.
2. A bearing assembly according to claim 1 wherein the housing members each have an outer flange portion at which they are secured, or adapted to be secured, together, and at which they are adapted to be secured to a mounting for the assembly to locate the assembly axially on or in the mounting.
3. A bearing assembly according to claim 2 wherein the outer flange portions of the housing members have registering holes whereby the housing members are secured together and can be secured to the mounting by means of bolts or like fastenings.
4. A bearing assembly according to any preceding claim wherein at least one of the housing members has an axially extending portion including one or more of the part-spherical portions.
5. A bearing assembly according to claim 4 wherein the axially extending portion has three of the part-spherical portions equi-spaced apart.
6. A bearing assembly according to any preceding claim wherein at the portions formed to co-operate with a mounting for axial and radial location of the assembly on or in the mounting, include one or more protrusions adapted to locate radially against a surface or surfaces of the mounting radially spaced from the central axis of the cylindrical bore, the arrangement being such that in use of the assembly with a shaft entered into the bush a radial force applied to the shaft is reacted by the assembly by a proportion of the radial force being transmitted to the mounting through the protrusion, or one of the protrusions.
7. A bearing assembly according to claim 5 wherein there are three said protrusions equi-spaced around the central axis of the cylindrical bore.
8. A bearing assembly according to claim 7 as dependent from claim 5 wherein the three part-spherical portions are disposed between the three equi-spaced protrusions such that the part-spherical portions and protrusions alternate around the central axis of the cylindrical bore.
9. A bearing assembly according to any preceding claim wherein the housing members have portions shaped to provide housings beyond opposite ends of the cylindrical bore for O-ring seals applied to a shaft entered into the bush for use of the assembly.
10. A bearing assembly according to any preceding claim wherein one of the housing members has a platform which receives and locates a grease nipple for injection of grease to lubricate the outer periphery of the bush and co-operating inner surfaces of the housing members.
11. A bearing assembly according to any preceding claim wherein the housing members are similar.
12. A bearing assembly according to any preceding claim wherein the housing members are metal pressings.
13. A bearing assembly according to any preceding claim wherein the bush is made of sintered metal.
GB9315964A 1989-12-07 1993-08-02 Bearing assembly Withdrawn GB2269427A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9315964A GB2269427A (en) 1989-12-07 1993-08-02 Bearing assembly

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB898927639A GB8927639D0 (en) 1989-12-07 1989-12-07 Bearing assemblies
GB9026464A GB2238834B (en) 1989-12-07 1990-12-05 Bearing assemblies
GB9315964A GB2269427A (en) 1989-12-07 1993-08-02 Bearing assembly

Publications (2)

Publication Number Publication Date
GB9315964D0 GB9315964D0 (en) 1993-09-15
GB2269427A true GB2269427A (en) 1994-02-09

Family

ID=27264831

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9315964A Withdrawn GB2269427A (en) 1989-12-07 1993-08-02 Bearing assembly

Country Status (1)

Country Link
GB (1) GB2269427A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0779190A1 (en) * 1995-12-12 1997-06-18 Valeo Systemes D'essuyage Sheet metal support bearing for a windscreen wiper shaft
WO1998034043A1 (en) * 1997-01-30 1998-08-06 Meritor Heavy Vehicle Systems Limited Brake bearing and camshaft assemblies

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB791470A (en) * 1955-05-06 1958-03-05 Clevite Corp Self-aligning bearing
GB2041109A (en) * 1979-01-06 1980-09-03 Rubery Owen Rockwell Ltd Bearing assemblies
GB2071225A (en) * 1980-03-06 1981-09-16 Forster P Self-adjusting bearing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB791470A (en) * 1955-05-06 1958-03-05 Clevite Corp Self-aligning bearing
GB2041109A (en) * 1979-01-06 1980-09-03 Rubery Owen Rockwell Ltd Bearing assemblies
GB2071225A (en) * 1980-03-06 1981-09-16 Forster P Self-adjusting bearing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0779190A1 (en) * 1995-12-12 1997-06-18 Valeo Systemes D'essuyage Sheet metal support bearing for a windscreen wiper shaft
WO1998034043A1 (en) * 1997-01-30 1998-08-06 Meritor Heavy Vehicle Systems Limited Brake bearing and camshaft assemblies

Also Published As

Publication number Publication date
GB9315964D0 (en) 1993-09-15

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