AU647158B2

AU647158B2 - An improved bearing bush

Info

Publication number: AU647158B2
Application number: AU81484/91A
Authority: AU
Inventors: Robert Leslie Watson
Original assignee: VICTOR IND Ltd
Current assignee: VICTOR INDUSTRIES Ltd
Priority date: 1990-07-31
Filing date: 1991-07-31
Publication date: 1994-03-17
Anticipated expiration: 2011-07-31
Also published as: AU8148491A; NZ234734A

Description

f, 647158 pOO011 Regulation 3.2

AUSTRALIA

Patents Act, 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT Original TO BE COMPLETED BY THE APPLICANT NAME OF APPLICANT: ACTULL INVENTOR(S):

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ADDRESS FOR SERVICE: 0 INVENTION TITLE: VICTOR INDUSTRIES LIMITED ROBERT LESLIE WATSON Peter Maxwell Associates Blaxland House, Suite 10, 5 Ross Street, NORTH PARRAMATTA NSW 2151 AN IMPROVED BEARING BUSH The following statement is a full description of this invention, including the best method of performing it know to me:- This invention relates to a bush and more particularly a two section bush suitable for utilisation with a pivotal support for an end of an helical tension spring or similar application.

An intention of this invention is to provide a two section bush which can, for example, be mounted through and captivate a mounting coil or eye of an helical tension spring to facilitate the articulation of the spring on an associated mounting. Preferably the bush is utilised with a separate inner bearing sleeve.

According to a first aspect of this invention there is provided a bush comrrising a first end section having a body portion of a lesser diameter than the diameter of a body portion of a second end section with each end section incorporating an axial bore therethrough and a shoulder at one end thereof extending radially of the body portion, a part of the bore of the second end e 20 section corresponding to the non-shouldered end thereof being of a diameter commensurate to the diametei of the body portion of the first end section whereby the firs3t end section can be inserted, non-shouldered end foremost, into that part of the bore of the second end section and 25 retained in a snap-fit assembly therei,- with, in assembly, the shoulders being spaued apart to form a S -2- (2 channel therebetween extending at least partly about the body portion of the second end section.

According to a second aspect of this invention there is provided a bush as described in the preceding paragraph wherein an annular groove is formed in the exterior face of the body portion of the first end section and a rib is formed in the face of the associated part of the bore of the second end section whereby in assembly the rib and groove inter-engage to snap-fit the bush sections together.

In further describing the invention reference is made to the accompanying drawings of a preferred embodiment and wherein; Fig 1 is an exploded cross-sectional view of the device depicted schematically with a conventional mounting therefor, and Fig 2 is a perspective view of the device assembled in a mounting eye of a tension spring.

A bush 3 is formed in two end sections 3a and 3b adapted .9 to be axially assembled together to provide a pivotal mounting. In situ preferably the bush 3 is utilised with 25 a separate inner bearing sleeve 5 as described in more detail hereinafter.

S-3t' Preferably the bush end sections 3a and 3b are moulded from suitable plastics material. Each end section 3a and 3b incorporates a body portion 6a, 6b respectively, through which an axially disposed bore 8 is provided.

Bore 8 is of a diameter that will provide that sleeve is a close working fit therein. At one end each body portion 6a, 6b incorporates a shoulder, lla and llb respectively, to extend at least partly and preferably, as depicted, completely thereabout.

A part 8b of the bore 8 of the end section 3a corresponding to the non-shouldered end thereof is a diameter commensurate to the diameter of body portion 6b of end section 3b. This enables the non-shouldered end of end section 3b to be inserted in bore section 8b.

Preferably an annular groove 9 is formed about the exterior periphery cf body portion 6b and preferably the length of body portion 6b matches the length of bore 20 section 8b. A rib 10 is preferably formed on the face of bore section 8b whereby in assembly of the end sections as aforesaid the rib 10 and groove 9 inter-engage to snap-fit the end sections 3a and 3b together. Preferably a step 7 is formed between the enlarged diameter bore a section 8b and the remainder of bore 8 of end section 3a.

Preferably the length of bore section 8b matches the -4- \Sa; length of body portion 6b such that in assembly the nonshouldered end of end section 3b abutts the step 7.

In assembly, as depicted in Fig 2 the shoulders lla and llb, following radial alignment thereof, form an exterior channel 12 within which, for example, an eye or mounting coil 13 of a spring 14 can be captivated when the bush end sections 3a and 3b are mounted, one each from either side, into that coil 13 to provide a mounting bush for the spring 14. The bush 3 is particularly suitable for use in enhancing a pivotal mounting of, for example, a helical tension spring 14 to an in situ mounting such as a bolt 15 extending therethrough preferably with bearing sleeve 5 therebetween.

Preferably axially extending annular walls 16a and L6b are provided at the periphery of each shoulder 1la and lib to extend away from the groove 12. Wall 16b forms a 4 cavity 17 in which the head of a mountin bolt 15 can be located. Preferably a cap 18 is provided to seal cavity 17.

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Claims

1. A bush comprising a first end section having a body portion of a lesser diameter than the diameter of a' body portion of a second end section with each end section incorporating an axial bore therethrough and a shoulder at one end thereof extending radially of the body portion, a part of the bore of the second end section corresponding to the non-shouldered end thereof being of a diameter commensurate to the diameter of the body portion of the first end section whereby the first end section can be inserted, non-shouldered end foremost, into that part of the bore of the second end the section and retained in a snap-fit assembly therein, with, in assembly, the shoulders being spaced apart to form a channel therebetween extending at least partly about the body portion of the second end section. 4

2. A bush as claimed in claim 1 wherein each shoulder extends completely about the periphery of its supporting body portion and a sleeve is provided to line the bore of S. the assembled bush. 4*

3. A bush as claimed in claim 1 or claim 2 wherein an annular groove is formed in the exterior face of the body portion of the first end section and a rib is formed in -oU r :N -I 9 the face of the associated part of the bore of the second end section whereby in assembly the rib and groove inter- engage to snap-fit the bush sections together.

4. A bush as claimed in any one of the preceding claims wherein an axially extending annular peripheral wall is formed on at least one shoulder to form a cavity at that end of the bush section and a detachable cap is provided to seal the cavity. A bush substantially as herein described with reference to the accompanying drawings. DATED this 22nd day of December, 1993. VICTOR INDUSTRIES LIMITED Patent Attorneys for the Applicant: PETER MAXWELL ASSOCIATES S S. es S -7- ABSTRACT A bush comprising two engageable components (3A, 3B) having an axially disposed bore disposed therethrough. In a particular form a separate inner bearing sleeve is disposed in close fitting relationship within the bore Connection between the first and second halves (3A, 3B) is made by the engagement of annular walls (6A, 6B) each of which extends proud of the end of respective sections (3A, 3B). Specifically, the annular wall of one section is *9jo stepped radially outward of the associated end of the bore so as to receive the annular wall of the other section inwardly thereof in assembly of the sections axially together to form a bush. In use the bush is suitable for utilisation with a pivotal support for an end of a helical tension spring (14) or similar.