Shift lock device for vehicle

Details Shift lock device for vehicle Shift lock device for vehicle

1999-10-26

2001-12-25

Marmor, Charles A (Department: 3681)

192 clutches and power-stop control

Transmission and brake

Motor vehicle

C192S220000, C074S48300R

Reexamination Certificate

active

06332524

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates to a shift lock device for vehicle, and more particularly to a shift lock device for vehicle constructed and arranged to expand an application range of sudden acceleration safety set-up mode, thereby preventing an occurrence of sudden acceleration beforehand.
2. Description of the Prior Art
In a conventional shift lock device, as illustrated in
FIG. 1
, an engagement of a lock cam
26
is constituted by a notch formed at an edge of lock arm of the lock cam
26
, and a proximal end of a lock cable
68
is connected to a brake pedal
32
while a distal end of the lock cable
68
is extended near to the lock cam
26
. The lock cable
68
is slidably inserted at a distal end portion into a guide sleeve
72
, while a lock pin
74
is fixed to a distal end of a cable
122
.
The lock cable
68
is moved backward and forward according to actuation of the brake pedal
32
. A lock pin
74
is protrudes from or is withdrawn to a guide sleeve
72
according to reciprocation of the lock cable
68
.
In the conventional shift lock device, when the brake pedal
32
is not depressed, the lock pin
74
protrudes from the guide sleeve
72
to thereby be fixed in a notch portion of the lock cam
26
, by which the lock pin
74
prevents rotation of the cam
26
, and locks the cam at a lock position illustrated in FIG.
1
. When the brake pedal
32
is depressed, the lock pin
74
is withdrawn along with the lock cable
68
to thereafter be detached from the notch portion.
At this time, when a selector lever
10
is established at a parking position (P) and the brake pedal
32
is not depressed, the lock cam is locked at a lock position by a lever lock mechanism
34
, while the selector lever
10
maintains a state where the selector lever
10
cannot be shifted to a neutral position (N) from the parking position (P).
In other words, shifting operation of the selector lever
10
is only possible when the brake pedal
32
is depressed. A prior art of a shift lock device is disclosed in a U.S. Pat. No. 4,905,802.
The shift lock thus described has a notch portion of the lock cam
26
engage or disengage the lock pin
74
operated by the brake pedal
32
in order to prevent an erroneous operations of the brake pedal and acceleration pedal, such that the selector lever
10
is only shifted and locked from the parking (P) position to the neutral (N) position.
However, there is a problem in the conventional shift lock device thus described in that the device only enables a selector lever to shift and lock from the parking (P) position to a neutral (N) position, such that, when the selector lever
10
is shifted from the neutral (N) position to other set-up mode position and a sudden acceleration is to occur, the shift lock function cannot be performed to thereby cause a unsafe driving.
SUMMARY OF THE INVENTION
The present invention is disclosed to solve the aforementioned problem and it is an object of the present invention to provide a shift lock device for vehicle adapted to shift-lock a selector lever from a parking position direction to a drive position direction or from a neutral direction to other set-up position direction when a brake pedal is not depressed while the selector lever is shift-lock at a parking position or a neutral position, thereby expanding a range of sudden acceleration safety application mode for prevention in advance of occurrence of the sudden acceleration.
In accordance with the object of the present invention, there is provided a shift lock device for vehicle, the device comprising:
a selector lever shiftable to lots of mode set-up positions including parking, neutral and driving positions;
a lock pin movable disposed at the selector lever for engaging to or disengaging from the engagement holes; and
lock release means interlocking for the selector lever to be shifted from the parking position to the neutral position or from the neutral position to the parking or driving position when a brake pedal is not depressed, while moving the lock pin to release an engaged state between the lock pin and the engagement holes when the brake pedal is depressed.


REFERENCES:
patent: 4096930 (1978-06-01), Viscardi
patent: 4905802 (1990-03-01), Gotoh
patent: 4966262 (1990-10-01), Mieczkowski
patent: 5379872 (1995-01-01), Dorr et al.
patent: 5493932 (1996-02-01), Plocher

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