| 摘要 |
Assembly comprising a handle element such as a pole having frictionally-secured to one end thereof an attachment such as a tool element adapted to be separated therefrom under the effects of a predetermined, variable axial pulling force. The invention comprises an adjustable tension fastener means having one part fixed to the handle element and another part fixed to the tool element, said one part being frictionally-engaged by said other part by an adjustable tension means which permits the degree of the frictional engagement to be adjusted to correspond to the amount of the pulling force at which it is desired that the pole and the attachment should separate. |
