Abstract: Disclosed herein is an improved filament-type trimming apparatus comprising a casing having base and rim portions, a spool having a hub portion and opposite flanges, at least one filament wound on the spool and a cover adapted to support the spool within the casing. The spool is adapted to be moved radially inwardly and outwardly by reason of centrifugal force generated responsive to the speed of rotation of the casing. Upon such movement, when the spool rotates independently of the casing and the cover, additional filaments are automatically fed out. The feeding of additional filaments may be stopped when the spool is in engagement with either the casing or the cover.

Abstract: A bicycle engine provided with a transmission roller on the end of a forwardly extending driving shaft for contacting the front wheel tire is attached to the front of the handle bar via an engine frame attached to the front wheel fork. A clutch provided between the engine and the driving wheel starts the engine by transmitting the rotation of the wheel caused by pedaling and also prevents the transmission of engine rotation when the engine is kept idle.

Abstract: A bicycle engine which is provided with a transmission roller on the end of a forwardly extending driving shaft for contacting with the front wheel tire, is attached to the bicycle in front of the handle bar via an engine frame attached to the front wheel fork. A lever attached to the engine frame and connected at an end thereof to the side of the transmission roller, is raised or lowered to incline the engine supported by the engine frame in order to secure contact or separation of the transmission roller and the front wheel tire.