Joints and connections – Interfitted members – Clamped members
Patent
1994-09-29
1996-09-03
Knight, Anthony
Joints and connections
Interfitted members
Clamped members
403371, 403367, 403 78, 403 22, F16C 1104, F16B 306
Patent
active
055517943
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a swivel link, especially for use in rotative interconnection of two relatively pivotable machine/building/construction members or similar interhinged parts at their adjacent end portions. One of said members/parts may be bifurcated and formed with two aligned swivel link attachment holes. The swivel link comprises one bolt and two expandable, internally conical sleeves, wherein the bolt is formed with two opposite directed, conically tapering end portions each intended to be placed in an attachment hole and each to cooperate with an internally conical sleeve. Each sleeve is assigned a nut for axial displacement of the respective internally conical sleeve, in order to bring the sleeve into surrounding engagement with the associated conical bolt portion within the respective-attachment hole. The bolt is formed with a through-going, axially directed bore for the accommodation of a shaft having threaded end portions for said nuts, said shaft, at one end portion thereof, having a stop flange which may be brought to rest against the adjacent end face of the bolt.
Such a swivel link is used where space conditions do not allow tightening of one of the nuts by means of an appropriate tool, i.e. in cases where one cannot reach the nut outside one of the attachment holes.
Likewise, it is previously known that the through-going shaft has a key groove in the end having free access. Upon rotation of the shaft from the end to which one has free access, it is intended that the non-accessible nut shall be displaced axially without any rotation, in order to, during the axial displacement thereof, to push the associated internally conical sleeve, often designated the cone sleeve, onto the adjacent conical end portion of the bolt, whereby the cone sleeve is brought to expand radially while wedging itself into the space between the conical end portion of the bolt and the internal wall defining the respective attachment hole.
In order no allow this known swivel link to function according to the purpose thereof, it is, of course, a presupposition that the non-accessible nut does not rotate with the through-going shaft. Such an undesirable nut rotation is, however, very difficult, if not impossible, to avoid.
In practice, when this prior art swivel joint is to be mounted, it has been found that the non-accessible nut has not been tightened properly, because it has turned around as the through-going shaft was rotated from the available end thereof. In fact, nothing prevents the non-accessible nut from turning, and one achieves at the most a very unsatisfactory influence on the respective cone sleeve, which then does not become properly expanded within the attachment hole, slackness or play within the hole not being taken sufficiently up. The complete result of such an inexpedient mounting of a swivel link of this kind is an articulation wherein the bolt is loose at one attachment, which may involve damages to the equipment wherein such an articulation is incorporated.
The accessible nut is rotatable on the through-going shaft's opposite, threaded end portion and becomes tightened as usually, so that, at the accessible end of the swivel link, difficulties do not arise in expanding the cone sleeve properly within the space between the attachment hole wall and the conical bolt end portion.
Between the two conically tapering end portions, the bolt has a central, cylindrical bolt portion on which the pivotable machine/building/construction member is rotatively supported, usually through the intermediary of a bearing (articulated or swivel bearing, slide or plain bearing), arranged in a bore in said pivotable member's end portion which, in active position, is positioned between the two branches of the bifurcated end of the attachment part, said bore being coaxially aligned with the two attachment holes.
The through-going shaft has a central lubricating groove which, at the inner end thereof, passes into a radial groove. The outer end of the latter is to be brought into registry with a radial lubricating groove
REFERENCES:
patent: 389480 (1888-09-01), Massett
patent: 1561507 (1925-11-01), Clark
patent: 3784316 (1974-01-01), Bittern
patent: 4824281 (1989-04-01), Katsube
Aarre Arne
Oaland Knut S.
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