Motorized hand tool for drilling
First Claim
1. A manually guided, motorized hand tool for drilling and/or percussive drilling comprising a housing, a handle attached to said housing, said housing having a drilling axis extending therethrough, a shaft located within said housing and disposed parallel to the drilling axis, means for mouting a drilling tool on the drilling axis of said housing so that the drilling tool can be rotated, a mass mounted on and rotatable relative to said shaft in a plane extending substantially perpendicular to said shaft so that said mass is rotatable relative to said housing in a plane extending substantially at right angles to the drilling axis, said mass has a moment of inertia so that when a moment of reaction about said shaft rotates said housing said mass remains stationary whereby relative movement takes place between said mass on said shaft and said housing, a switch located within and mounted on said housing and operable by said mass when said mass experiences a predetermined angular displacement relative to said housing, and said switch arranged to interrupt the power supply to said drive means when said switch is operated by said mass.
1 Assignment
0 Petitions
Accused Products
Abstract
A manually guided motorized hand tool used for drilling and/or percussive drilling includes a housing with a mass movably mounted about the drilling axis for movement relative to the housing. A switch is mounted on the housing and is operable by the mass when it moves a certain angular distance relative to the housing. When operated, the switch cuts off the power supply to the hand tool.
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Citations
7 Claims
- 1. A manually guided, motorized hand tool for drilling and/or percussive drilling comprising a housing, a handle attached to said housing, said housing having a drilling axis extending therethrough, a shaft located within said housing and disposed parallel to the drilling axis, means for mouting a drilling tool on the drilling axis of said housing so that the drilling tool can be rotated, a mass mounted on and rotatable relative to said shaft in a plane extending substantially perpendicular to said shaft so that said mass is rotatable relative to said housing in a plane extending substantially at right angles to the drilling axis, said mass has a moment of inertia so that when a moment of reaction about said shaft rotates said housing said mass remains stationary whereby relative movement takes place between said mass on said shaft and said housing, a switch located within and mounted on said housing and operable by said mass when said mass experiences a predetermined angular displacement relative to said housing, and said switch arranged to interrupt the power supply to said drive means when said switch is operated by said mass.
Specification