Electric hair cutting appliance with counter weight
View Patent ↗A hand-held hair cutting appliance has a housing, a first cutting blade, and a second cutting blade. The first cutting blade is capable of reciprocating movement relative to the housing. A drive assembly is operatively connected to the first cutting blade for drivingly reciprocating the first cutting blade relative to the housing. A counter weight is adapted for reciprocating movement relative to the housing in response to reciprocating movement of the first cutting blade. The counter weight has at least one of a mass and a location relative to the first cutting blade to thereby at least partially counter-balance the reciprocating movement of the first cutting blade.
1. A blade head assembly for a hand-held hair cutting appliance, the hair cutting appliance comprising a handle, a drive assembly disposed at least in part within the handle and held in assembly therewith, and the blade head assembly, said blade head assembly being removably attachable to the handle in operative connection with the drive assembly and comprising:
a blade head assembly housing having a front, a back and two opposite sides,
a first cutting blade and a second cutting blade, said first and second cutting blades being held in assembly with the blade head assembly housing for attachment and detachment from the handle with the blade head assembly, said first cutting blade being capable of reciprocating translational movement relative to the blade head assembly housing such that the first cutting blade is moveable in a side to side direction relative to the handle and the second cutting blade, the blade head assembly being arranged and configured such that upon attachment of the blade head assembly to the handle of the hair cutting appliance the first cutting blade is operatively connected to the drive assembly; and
a counter weight held in assembly with the blade head assembly housing and being adapted for reciprocating movement relative thereto in response to reciprocating translational movement of the first cutting blade to thereby at least partially counter-balance the reciprocating translational movement of the first cutting blade, the blade head assembly being configured for movement of the counter weight in a direction generally opposite to a direction of movement of the first cutting blade.
2. The blade head assembly set forth in claim 1 wherein the counter weight is held in assembly with the first cutting blade for conjoint operative connection of the first cutting blade and the counter weight with the drive assembly upon attachment of the blade head assembly to the handle of the hair cutting appliance.
3. The blade head assembly set forth in claim 2 further comprising a pivot link pivotably connected to the housing for pivoting movement relative thereto about a pivot axis oriented other than in the direction of reciprocation of the first cutting blade, the pivot link being adapted for operative connection to the drive assembly upon attachment of the blade head assembly to the handle of the hair cutting appliance such that the drive assembly reciprocatingly pivots the pivot link about its pivot axis, the first cutting blade and the counter weight each being operatively connected to the pivot link in spaced relationship with the pivot axis such that the pivot link conjointly reciprocates the first cutting blade and the counter weight in response to the pivot link being reciprocatingly pivoted by the drive assembly.
4. The blade head assembly set forth in claim 3 wherein the first cutting blade and the counter weight are arranged relative to the pivot link in operative connection therewith such that the counter weight continually moves in a direction generally opposite to the direction in which the first cutting blade moves upon reciprocating pivoting movement of the pivot link about its pivot axis.
5. The blade head assembly set forth in claim 4 wherein the pivot link is generally elongate and has a longitudinal axis, a first segment extending longitudinally away from the pivot axis on said longitudinal axis and a second segment extending longitudinally away from the pivot axis on said longitudinal axis in a direction opposite the first segment, the first cutting blade being held in assembly with the first segment and the counter weight being held in assembly with the second segment.
6. The blade head assembly set forth in claim 4 wherein first cutting blade, the pivot link and the counter weight together have a center of mass, said center of mass being one of at and adjacent to the pivot axis of the pivot link.