Parking brake mechanism for vehicles

• US 5,649,453 A
• Filed: 12/20/1995
• Issued: 07/22/1997
• Est. Priority Date: 12/20/1994
• Status: Expired due to Fees

• Current Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Original Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Inventors: Kanbe, Kazunari
• Primary Examiner(s): LUONG, VINH
• Application Number:
  US08/575,550
• Time in Patent Office: 580 Days
• Field of Search: 74/512, 74/516, 74/575, 74/501.5 R, 74/542, 74/567, 74/569, 74/518, 74/560, 74/540
• US Class Current: 74/512
• CPC Class Codes: B60T 7/047 Hand-actuated release means
• CPC Class Codes: Y10T 74/20528 Foot operated
• CPC Class Codes: Y10T 74/20558 Variable output force
• CPC Class Codes: Y10T 74/20714 Lever carried rack
• CPC Class Codes: Y10T 74/20726 Pedal controlled
• CPC Class Codes: Y10T 74/20888 Pedals
• CPC Class Codes: Y10T 74/2133 Pawls and ratchets
• CPC Class Codes: Y10T 74/214 Multiple tooth

Abstract

A parking brake mechanism for vehicles includes a cam plate free to rotate about main shaft with respect to a foot operated parking brake pedal lever and having cam portions. When a brake control cable is connected with the wheel brake assembly, the cam plate is held in integral relation with the brake pedal lever by one of the cam portions, a cam follower and a tension spring so that the cable cam be easily connected with the cam plate regardless of the biasing force of the tension spring.

Claims

1. A parking brake mechanism for a vehicle comprising:

a bracket adapted for connection with a body of the vehicle,

a foot-operated brake pedal lever rotatably supported on a main shaft secured to the bracket, said brake pedal lever being provided with a cam slot,

a cam plate pivotally mounted on the main shaft to freely rotate with respect to the brake pedal lever, said cam plate having a first cam portion and a second cam portion,

a cable having one end connected to the cam plate and an opposite end for connection to a wheel brake assembly to be pulled by foot depression of the brake pedal lever,

a cam follower engaged in the cam slot formed on the brake pedal lever for displacement along the cam slot, and

a spring disposed between a stationary member and the cam follower and providing a biasing force to urge the cam follower toward the first and second cam portions in pressure contact therewith,

the cam plate and the brake pedal lever being displaced together upon engagement of the cam follower with the first cam portion, and the cam plate being displaced about the main shaft with respect to the brake pedal lever by the biasing force of the spring in a direction to pull the cable upon engagement of the cam follower with the second cam portion.

2. A parking brake mechanism according to claim 1, further comprising:

a ratchet plate on which are provided a plurality of teeth, said ratchet plate being secured to the brake pedal lever,

a pawl plate rotatably supported on a pin and normally disengaged from the teeth of the ratchet plate, and

a release lever engaged with a part of the pawl plate for disengagement of the pawl plate from the teeth of the ratchet plate upon manual pulling of the release lever.

3. A parking brake mechanism according to claim 2, wherein the second cam portion is composed of a tapered surface and the first cam portion is composed of a semi-circular recess continuously formed along a side edge of the tapered surface.

4. A parking brake mechanism according to claim 2, wherein the ratchet plate is located on a side of the cam plate opposite to the cam portions and the cable is connected with the cam plate at a position between the ratchet plate and the first and second cam portions.