Resources Contact Us Home
Shifter with shape memory alloy and safety

Image Number 19 for United States Patent #8117938.

A shifter incorporates a shape memory alloy wire (SMA actuator) to control movement of a blocker to selectively prevent moving a shift lever (or pawl) out of its park position until predetermined vehicle conditions are met. A mechanical fuse (i.e., flexible overload spring) prevents damage to the SMA actuator where the shift lever (or pawl) can be frictionally stopped from movement despite the contraction of the SMA actuator. The control circuit for the SMA actuator includes a photo-electric switch for stopping electrical power to the SMA actuator when the shift lever is moved from its park position, and the shift lever includes structure for mechanically continuing to hold the switch open while out of park. Further, the control circuit is operably connected to an ignition key retaining mechanism so that the ignition key cannot be removed when the lever is not in its park position.

  Recently Added Patents
High-density fiber optic modules and module housings and related equipment
X-ray imaging
Apparatus and method for masking a clock signal
Method for maintaining a driver-independent braking intervention after a collision
Nestable shallow container
  Randomly Featured Patents
Method for controlling the reeling of a web
Magnetic resonance method for characterizing fluid samples withdrawn from subsurface formations
Probe card changer system and method
Interferon-related polypeptides as CR2 ligands and their use for modulating immune cell functions
Electrical connector assembly having improved substrate
Bearing liner
Methods for producing chiral chromones, chromanes, amino substituted chromanes and intermediates therefor
Photosensitive colored composition for color filter
Methods and systems for analyzing T-wave alternans