Movable or removable closures – With means mounting closure for reciprocation – Diverse or springy material guide or slide
Reexamination Certificate
1998-06-12
2001-11-13
Chin-Shue, Alvin (Department: 3634)
Movable or removable closures
With means mounting closure for reciprocation
Diverse or springy material guide or slide
C049S404000
Reexamination Certificate
active
06314682
ABSTRACT:
This invention relates to a process for improving the sliding qualities of a slide contact or carriage on a rail and a device for implementing the process.
BACKGROUND OF THE INVENTION
The invention can be used in particular to improve the sliding qualities of a window support carriage on a rail of a vehicle door “cassette” such as the one described in the French patent application filed by the applicant on Jan. 24, 1997 with registration number 97 00790.
The slide rails of the window support carriages for vehicle door cassettes can expand under the effect of thermal fluctuations. The deformation of the rails is hindered by the rail attachment screws in the shell of the door of the vehicle, these attachment screws generally being located at both ends of the rails. Thus, as it deforms, the rail can over its length acquire irregularities, in particular in locations hindered by the screws. Consequently, the rail can lose its regular curvature which can cause malfunction in the window crank mechanism; in particular, the window support carriages can become blocked. Moreover, the rail has to be made of a plastic material with good properties of mechanical resistance to stress and strain, good resistance to wear from the sliding of the runners and a good friction coefficient between the material comprising the rail and that comprising the runner. All the above requires the user to mold his rail with a very specific plastic material which is difficult to work with.
SUMMARY OF THE INVENTION
The first object of the invention is a process for improving the sliding qualities of a slide contact or carriage on at least one rail, especially in the case of deformations of the rail caused by thermal fluctuations, alleviating the drawbacks of prior art.
This object is achieved in that to improve the sliding qualities of a slide contact or carriage on at least one rail, the carriage carrying a part intended to be moved along the rail, the process comprises a stage wherein, on the surface of the rail on which the carriage moves a section is installed which has a shape which corresponds to the shape of the rail and a device for implementing the process, the section closely following the contour of the rail and smoothing out irregularities or deformations of the rail due in particular to thermal expansion of the latter.
According to another characteristic the section runs on the rail in a direction parallel to the direction of the rail.
According to another characteristic the section is engaged on the rail in a direction perpendicular to the direction of the rail.
According to another characteristic the section is made part of the rail, but can still move proximate to one of its ends, allowing longitudinal expansion of the section along the rail without affecting the possible shape or curve of the section.
A second object of the invention is a device for implementing the process according to the invention.
This object is achieved in that the device which improves the sliding qualities of a carriage on at least one rail is comprised of a section fastened to the surface of the rail on which the carriage moves, the section having a shape which complements the shape of the rail and closely conforms to the shape of the latter.
According to another characteristic, the section is made a removable part of the rail, proximate to at least one of its ends.
According to another characteristic, the section is composed of plastic material.
According to another characteristic, the section is made part of the rail proximate to one of its ends.
According to another characteristic, there is a section located on the rail(s) of the window crank cassette of the vehicle door.
According to another characteristic, there is a section located on the rail(s) of the window crank system of the vehicle door.
According to another characteristic, the section has a friction coefficient less than the friction coefficient of the rail allowing reduction of loads applied to the carriage to move the latter along the rail.
According to another characteristic, the section is composed of acetal.
According to another characteristic, the rail is composed of polypropylene.
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Chin-Shue Alvin
Cohen Curtis A.
Mecaplast Sam
Nixon & Vanderhye P.C.
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