초록 ▼

A reversing switch, controlling the direction of rotation of the working spindle of a combination motor-driven hand tool, displaces a rack rod in a direction parallel to the axis of the spindle to provide an interlock both with a percussion boring feature and with provisions for seating attachments

A reversing switch, controlling the direction of rotation of the working spindle of a combination motor-driven hand tool, displaces a rack rod in a direction parallel to the axis of the spindle to provide an interlock both with a percussion boring feature and with provisions for seating attachments on the chuck sleeve of the tool, such as a circular saw. When the percussion boring feature is put into operative position, the rack rod is caused to prevent moving the reversing switch from right-hand rotation to left-hand rotation. When the switch is set for left-hand rotation, the seating surface of the chuck sleeve locks to prevent mounting an attachment and, at the same time, the percussion boring mechanism is blocked in an out-of-service position.

대표청구항 ▼

A motor-driven combination rotary tool having a casing, a motor therein, a working spindle mounted thereon carrying a bit-holding chuck, manually settable drive-reversing means for causing said spindle to be driven by said motor either in normal right-hand rotation or in the opposite left-hand rotat

A motor-driven combination rotary tool having a casing, a motor therein, a working spindle mounted thereon carrying a bit-holding chuck, manually settable drive-reversing means for causing said spindle to be driven by said motor either in normal right-hand rotation or in the opposite left-hand rotation, and equipped or designed to power optionally usable means for operating detachable auxiliary tools which are compatible only with right-hand rotation of said spindle and also comprising the improvement which consists in that: a mechanical interlock device is provided which is mechanically coupled with said drive reversing means independently of the application of rotary force to said spindle for blocking and thereby rendering inoperative said optionally usable auxiliary tool operating means when said drive-reversing means are set for left-hand rotation of said spindle and for blocking, and thereby preventing left-hand rotation of said spindle, so long as said optionally usable auxiliary tool operating means are mechanically coupled to said spindle.