Blade assembly having entrapped spring

A blade assembly for a hair cutting apparatus, the blade assembly comprising:

• a lower blade having teeth extending along an edge of the lower blade;
• an upper blade having teeth extending along an edge of the upper blade;
• a yoke having a channel, the yoke coupled to the upper blade to reciprocate the upper blade;
• an arcuate shaped spring having a spring base and a spring arm, wherein the spring arm is coupled to the channel of the yoke, wherein the arcuate shaped spring has a coil with a semi-circular arc portion, and wherein the spring base is positioned above the lower blade;
• and
• a spring retainer comprising a guide base, wherein the spring retainer retains the arcuate shaped spring against the lower blade;
• wherein the upper blade further comprises a depending surface in the upper blade that is offset from and faces away from the edge of the upper blade, the depending surface interfacing against the spring retainer to guide the upper blade over the spring retainer.

A blade assembly for a hair cutting apparatus, the blade assembly comprising:

• a lower blade having teeth extending along an edge of the lower blade;
• an upper blade having teeth extending along an edge of the upper blade;
• a yoke having a channel, the yoke coupled to the upper blade to reciprocate the upper blade;
• an arcuate shaped spring having an arcuate shape between a spring base and a spring arm, wherein the spring arm is coupled to the channel of the yoke, the spring arm extending through the channel to form a free end of the spring arm, wherein the arcuate shape couples the spring base to the spring arm such that the arcuate shaped spring has a portion which is shaped as a semi-circular arc, and wherein the spring base is positioned above the lower blade;
• and
• a spring retainer comprising a guide base, wherein the spring retainer retains the arcuate shaped spring against the lower blade;
• wherein the upper blade further comprises a depending surface in the upper blade that is offset from and faces away from the edge of the upper blade, the depending surface interfacing against the spring retainer to guide the upper blade over the spring retainer.