Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Reexamination Certificate
2000-05-08
2001-10-09
Fenstermacher, David (Department: 3682)
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
C074S4830PB
Reexamination Certificate
active
06298743
ABSTRACT:
The invention relates to a selector lever for automatic transmissions, which is used to control the gearbox of a motor vehicle and to select various shift positions. It comprises a handle with attached hollow shaft, inside of which a stop bar can be moved in axial direction between a release position and a stop position. In the stop position, the lever is secured in the respective shift position while in the release position, the selector lever can be pivoted to another shift position. The lever can be released from the stop position with the aid of the stop bar. The stop bar for a selector lever disclosed in German Patent 195 06 766 C1 is actuated with an actuating part designed as pushbutton. The actuating part can be moved inside a guide channel of the handle, crosswise to the axial direction or the movement direction of the stop bar. A pivoting lever is mounted on the actuating part, which can be pivoted in a plane defined by the axial direction and the actuating direction. The pivoting lever for one exemplary embodiment of the known selector lever is designed with one arm and, upon depressing the pushbutton, makes contact with its free end with a slanted surface arranged inside the handle. The pivoting lever extends through the stop bar end that projects into the guide channel of the handle and lifts up the stop bar with a slanted region of the lever arm. As a result, the selector lever is released from the stop position.
The particular disadvantage of the known selector lever is that in addition to its involved assembly, the stop bar is admitted with a force component that is effective crosswise to its longitudinal axis or crosswise to the axial direction. This transverse load increases the force for lifting the stop bar. In addition, the guidance of the stop bar inside the hollow shaft is subject to increased wear.
Starting with this, it is the object of the invention to propose a selector lever that does not have said disadvantages.
The solution involves a selector lever having the features listed in claim
1
. Based on this, the actuating part has at least one slanted surface that cooperates in the manner of a wedge-type sliding gear with a counter surface on a sliding piece, which is forcibly guided inside the handle in movement direction of the stop bar or in axial direction. This sliding piece is movement-connected to the actuation end of the stop bar facing the handle, via a connection that is not free of play or is movable in actuation direction. Wedge-type sliding gears of the type mentioned herein are described, for example, in “KONSTRUKTIONS-ELEMENTE DER FEINMECHANIK” [Design Elements in Precision Engineering], Carl Hauser Publishing House, 1993, pages 105, 537. They comprise a driving member with a wedge-type surface and a power take-off part with a counter surface that cooperates with the wedge-type surface. The power take-off part or the sliding piece of such a wedge-type sliding gear is guided restrictively in a crosswise to the movement direction of the driving part or the actuating part. When cooperating with the slanted surface of the actuating part, the sliding piece is admitted with a force component that is effective in actuating direction. To avoid such a transverse load on the stop bar, the invention suggests using a separate sliding member and not the stop bar for the sliding piece. This separate sliding member is movement-connected to the actuating end of the stop bar that is facing the handle, via a connection that is not free of play or is movable in actuating direction. The force component effective in actuating direction is thus absorbed by the sliding piece or a guide surface of the handle that cooperates with this sliding piece in the manner of a restrictive guide. A transfer of this force component to the stop bar is effectively excluded, owing to the fact that the movement connection between sliding piece and actuating end of the stop bar in actuating direction is not free of play, in other words it is movable.
Advantageous embodiments of the invention are specified in the dependent claims.
REFERENCES:
patent: 4747278 (1988-05-01), Roncelli et al.
patent: 4774850 (1988-10-01), Shovlin
patent: 5181592 (1993-01-01), Pattock
patent: 5247849 (1993-09-01), Sato
patent: 5617760 (1997-04-01), Woeste et al.
patent: 39 09 565 (1990-10-01), None
patent: 195 06 766 (1996-02-01), None
patent: 44 27 695 (1996-02-01), None
patent: 44 34 135 (1996-03-01), None
patent: 195 13 809 (1996-10-01), None
patent: 0 300 268 (1989-01-01), None
patent: 0 459 485 (1991-12-01), None
patent: 0 709 597 (1996-05-01), None
patent: 56-29723 (1981-03-01), None
Hese Wolfgang
Horn Heinz
Fenstermacher David
HKR Haas GmbH & Co. Kunstsoff KG
Kelemen Gabor J.
Venable
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