Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1995-03-03
1996-10-22
Herrmann, Allan D.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
74579R, 403300, 403305, 403306, G05G 2500, B60K 2000, F16H 5902
Patent
active
055665802
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a motion transmission rod, especially for operating a gearbox.
BACKGROUND OF THE INVENTION
In order to prevent vibration being transmitted from the gearbox to the operating lever, use may be made of cable connections, or a filtering joint may be located at the extremity of the transmission rod, but these solutions are expensive.
SUMMARY OF THE INVENTION
The object of the present invention is to provide other solutions to this problem, which are simple to fit and relatively inexpensive to manufacture, while complying with the overall space requirement stipulations.
To this end, a rod in accordance with the invention includes, over a part of its length, an elastic filtering sleeve and is characterized in that this sleeve is engaged via its extremities in two tubular extremities of the rod, which are thus connected to each other.
This sleeve will generally include a rigid core coated with an elastic coating, this cores consisting, for example, of a rod of rectangular cross section or of a tube of round cross section.
In order to contrive for the rod to transmit the movements of the lever accurately, while effectively filtering out vibration, it may further be characterized in that said sleeve transversely has various stiffnesses.
This could be obtained by the shape of the cross section of the rigid core, and also by the fact that said tubular extremities of the rod are flattened in order to produce the clamping of said sleeve.
Other improvements to this rod consist in making sure that the two tubular extremities of the rod, connected to each ocher by the elastic filtering sleeve, cannot pivot with respect to one another about the axis of the rod while it is being operated.
To this end, a rod as defined hereinabove is, in accordance with the present invention, further characterized in that said rod has, in the region of the union between said tubular extremities of the rod, at least one widened part also coated with said elastic coating and engaged in two notches of shape complementary to that of said widened part and made in the end face of said extremities.
Preferably, two widened parts will even be provided, these also being coated with said elastic coating and engaged in two pairs of notches of shape respectively complementary to those of these widened parts, and made in the end face of said extremities.
Thus, this pivoting of the two tubular extremities of the rod will be prevented, and this will be the case without any rigid bridge being established between these extremities, because these widened parts are coated with elastic material.
According to another provision of the invention, said elastic coating of the sleeve has a peripheral bead capable of being inserted, after fitting, between said tubular extremities of the rod.
This bead will thus constitute an elastic limit stop between these extremities, capable of limiting their axial movement with respect to each other, and here again without creating any rigid union between these extremities.
Advantageously, the rod could be further characterized in that two flattened lengths of reinforcing tube are clamped onto said flattened tubular extremities of the rod, which will reinforce the rod at this point.
In order to prevent these lengths from pivoting axially with respect to each other, it is advantageous for them to include at the end, in their facing extremities, notches similar to those which are made in the end face of the tubular extremities of the rod, so as to receive the extremities of said widened parts.
BRIEF DESCRIPTION OF THE DRAWINGS
Various embodiments of the invention will now be described by way of non-limiting examples, with reference to the figures of the appended drawing in which:
FIG. 1 is a view in axial section of the filtering sleeve before fitting into the rod, on the line I--I of FIG. 2;
FIG. 2 is an end-on view of the filtering sleeve;
FIG. 3 is a side view of a rod for operating a gearbox equipped, in accordance with the invention, with the sleeve of FIGS. 1 and
REFERENCES:
patent: 4492129 (1985-01-01), Hasegawa
patent: 4777839 (1988-10-01), Lindholm et al.
patent: 4960009 (1990-10-01), Schultz et al.
patent: 5189925 (1993-03-01), Neal et al.
patent: 5347881 (1994-09-01), Watson et al.
Girard Andre
Piu Giovanni
Herrmann Allan D.
Hutchinson
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