Shift lever interlock

Details Shift lever interlock Shift lever interlock

1999-07-26

2001-05-29

Bucci, David A. (Department: 3682)

Machine element or mechanism

Control lever and linkage systems

Multiple controlled elements

C074S473240, C074S4710XY, C074S473330

Reexamination Certificate

active

06237436

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to an interlock for a vehicle shift lever assembly.
A known shift lever assembly for a production vehicle, such as an agricultural tractor, includes a park shift member which is linked to a park actuator on the transmission via a Bowden cable and a forward-neutral-reverse (F-N-R) shift member which is linked to forward, neutral and reverse transmission actuators via Bowden cable and rod linkage. A forward, neutral, reverse, park (F-N-R-P) lever is movable within a guide slot and to selectively engage and operate the park shift member and the F-N-R shift member. It would be desirable to provide an interlock mechanism which, when the lever is out of engagement with the F-N-R shift member, prevents inadvertent actuation of the F-N-R shift member, such as by movement of the linkages or cables between the shift member and the actuator on the transmission.
SUMMARY OF THE INVENTION
Accordingly, an object of this invention is to provide an interlock mechanism for a transmission shift lever assembly which, when the lever is in the park position, prevents the transmission from being inadvertently placed in a forward or reverse operative condition.
This and other objects are achieved by the present invention, wherein a shift lever assembly includes a housing having side walls with apertures formed therein, a first shift member pivotally supported by the housing and for linking to a first transmission actuator, a second pivotally supported by the housing for linking to a second transmission actuator, and a lever movable to selectively engage and operate the first and second shift members. An elongated interlock member is coupled to the lever and slidably received by the first and second shift members. The member has ends which are received by the apertures, and having a part which engages the second shift member to prevent pivoting of the second shift member when the leer moves into engagement with the first shift member.


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John Deere 7000 Series, 3 pp.

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