Cutlery – Cutting tools – With blade moving means
Patent
1987-11-30
1989-04-25
Yost, Frank T.
Cutlery
Cutting tools
With blade moving means
56127, B26B 700
Patent
active
048234656
ABSTRACT:
The cutting head assembly of a motor-driven flexible line trimmer has a line feed mechanism which includes a housing member connected to and driven by a drive shaft from the prime mover and having a centrally located cylindrical wall for receiving a compression spring. A locking plate and cup member is reciprocably disposed around the cylindrical wall and compresses the spring substantially to its normal running position where it is held in position relative to the housing member by suitable retention structure. A spool is disposed around the cup portion of the locking plate and cup member and unless restrained, is free to rotate relative to the housing member to pay out line through an aperture in the housing member. A cover ring member has a central opening which is coupled to the housing member and holds a ground engaging button member against the lower end of the cup member. The upper and lower faces of the spool have radially extending ribs which cooperate with locking teeth on the lower face of the locking plate and escapement teeth on the upper edge of the button member to lock the spool against rotation when the locking plate and cup member are in the lower, normal running position, and to permit the spool to rotate through a controlled increment when the button is bumped against the ground and thus reciprocated, along with the locking plate member, upwardly then downwardly as a result of the biasing force of the spring.
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Fridie Jr. Willmon
White Consolidated Industries, Inc.
Yost Frank T.
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