Power miter saw having a fence with elevated platforms

A power miter saw comprising:

• a base assembly including a frame, a plurality of cavities on a bottom of the frame, two supports at two sides of the frame respectively, and two parallel sliding rods passing through one support;
• a table assembly including a rotatable table mounted on the frame, a miter arm secured to the rotatable table, and a fence at an edge of the rotatable table and secured to the supports;
• and
• a saw blade and motor assembly including an electric motor, a rotatable circular saw blade driven by the electric motor, a handle, and a mounting member secured to the rotatable table;
• wherein the fence includes a central curved top, two platforms at two ends of the central curved top respectively, two shoulders each at a joining portion of the central curved top and the adjacent platform, and two aligned grooved members each extending outward from a position proximate the platform;
• wherein the platforms are at an elevation greater than that of the miter arm;
• wherein the miter arm is rectangular and includes a first positioning member projecting downward, a second positioning member projecting downward, and a pivot member pivotably secured to a rear end of the miter arm and having an urging plate;
• wherein the table assembly further includes:
• a lever pivotably secured to a rear end of the miter arm and including a first cam urging against the urging plate;
• a spring biased link pivotably secured to a bottom of the miter arm and including an opening at a rear end, a groove defined between the opening and a front end, a slot through the groove, two opposite L-shaped holes adjacent to the front end, and a locking member disposed in the rear end under the opening;
• a safety device pivotably mounted through the L-shaped holes and including two spaced second cams urging against inner surfaced of the L-shaped holes respectively, wherein the safety device is pivotably secured to the rear end of the miter arm;
• and
• a spring biased linking rod including a rear retaining member slidably disposed in the opening, being adjacent to the frame, and urging against the first positioning member, and a retaining element anchored in the urging plate and urging against a front end of the linking rod;
• wherein the locking member has an end releasably positioned in one of the cavities in a first position of the safety device with the miter arm being held in place;
• wherein in response to pivoting the safety device to a second position, the link moves upward, and the locking member moves downward to clear the cavity, thereby unlocking the miter arm;
• and
• wherein in response to pivoting the lever downward, the linking rod moves inward, and the retaining member urges against the frame, thereby locking the miter arm.