Automotive lift and swing arm restraint system for automotive lift

A swing arm restraint system for an automotive lift, said swing arm restraint system comprising:

• a movable carriage including a swing arm mounting portion comprising first and second spaced-apart mounting plates;
• a tubular swing arm restraint housing non-rotatably connected to the swing arm mounting portion of the carriage, said swing arm restraint housing comprising an internal space;
• a swing arm pivotally connected to the swing arm mounting portion and rotatable relative to the swing arm restraint housing about a swing axis, said swing arm comprising a non-circular lock recess;
• a first restraint device located in said internal space of and non-rotatably connected to said swing arm restraint housing;
• a second restraint device located in said internal space of the swing arm restraint housing and non-rotatably connected to said swing arm, said second restraint device movable in said internal space relative to said first restraint device axially along a lock axis that is coincident with said swing axis between a locked position where said second restraint device is non-rotatably engaged with the first restraint device and an unlocked position where said second restraint device is disengaged from and rotatable relative to the first restraint device;
• a rod connected to said second restraint device and extending in said internal space along said lock axis;
• a non-circular torque transfer head non-rotatably connected to said second restraint device and non-rotatably engaged with said non-circular lock recess of said swing arm such that said second restraint device is non-rotatably engaged with and rotates with said swing arm, wherein said torque transfer head is axially movable along said lock axis in said recess when said second restraint device moves between said locked and unlocked positions;
• a handle operably connected to said second restraint device for manually moving said second restraint device along said lock axis relative to said first restraint device from said locked position toward said unlocked position;
• a spring that biases said second restraint device toward said locked position;
• wherein:
• (i) in said locked position, the first and second restraint devices are non-rotatably coupled such that said swing arm and said second restraint device are non-rotatably coupled to said swing arm restraint housing;
• (ii) in said unlocked position, the first and second restraint devices are decoupled with respect to each other such that said swing arm and said second restraint device are rotatable relative to said swing arm restraint housing;
• said swing arm restraint housing comprising a non-circular outer surface and opposite non-circular first and second ends, and said first and second mounting plates respectively comprising first and second non-circular apertures in which said non-circular first and second ends are respectively received such that said swing arm restraint housing extends between and is non-rotatably connected to said first and second mounting plates;
• first and second pivot bosses non-rotatably mounted respectively on the non-circular first and second ends of the swing arm restraint housing, said first and second pivot bosses each comprising a cylindrical outer surface, wherein a first ear of said swing arm is pivotally engaged with the cylindrical outer surface of the first pivot boss and a second ear of said swing arm pivotally engaged with the cylindrical outer surface of the second pivot boss for rotation of the swing arm relative to the swing arm mounting portion and relative to the swing arm restraint housing.