초록 ▼

A lightweight, portable concrete vibrator is provided. A vibrator head includes a hollow casing with an eccentric rotor having a curved segment along one side extending in an arc of 120.degree. so as to position the rotor centroid at the most favorable position to induce maximum vibration for aggreg

A lightweight, portable concrete vibrator is provided. A vibrator head includes a hollow casing with an eccentric rotor having a curved segment along one side extending in an arc of 120.degree. so as to position the rotor centroid at the most favorable position to induce maximum vibration for aggregate distribution and filling of voids or air pockets in wet concrete. An inverted, V-shaped stiffening segment is formed on the opposite side of the rotor. The ratio of the centroid offset from the rotation axis to the diameter is in the range of 1:3.5-1:3.75. A tubular support assembly forms the handle for the motor. Preferably, the motor is a small, two cycle engine operating in the range of 5,000 to 7,000 rpms. A bearing sleeve may be provided adjacent the distal end of the vibrator head in order to accommodate any incidental lateral flexing of the rotor in the casing.

대표청구항 ▼

[ What is claimed is:] [7.] A lightweight, portable concrete vibrator comprising:a vibrator head including a hollow casing and eccentric rotor mounted at its ends therein for rotation;a drive shaft for imparting rotary motion to the rotor along a center axis of rotation;a motor for driving said shaf

[ What is claimed is:] [7.] A lightweight, portable concrete vibrator comprising:a vibrator head including a hollow casing and eccentric rotor mounted at its ends therein for rotation;a drive shaft for imparting rotary motion to the rotor along a center axis of rotation;a motor for driving said shaft to cause vibration of the head upon rotation of the rotor; andsaid rotor having an integral curved segment between said ends disposed only along one side of the center axis of rotation, said curved segment extending in an arc of less than 180.degree., the rotor centroid being offset except for said ends from the center axis of rotation and positioned between the center axis of rotation and the outer face of said curved segment, an integral stiffening segment extends along the other side of said rotor to further resist lateral flexing of said rotor in said casing, said stiffening segment having an outer surface that is substantially V-shaped and inverted along said other side, the apex of the V being positioned adjacent the center axis of rotation and the distal ends of the V-shaped segment being integrally connected adjacent the ends of the curved segment,whereby the offset of said rotor and said centroid of said rotor except for said ends provides maximum vibration to distribute the aggregate and fill voids in wet concrete, while maintaining sufficient rotor strength to resist lateral flexing of the rotor in the casing.