Patent ID: 8960058
Filing Date: 2015-02-24
Classification: B25B

Abstract:
1. A torque adjustment device for a screwdriver, comprising: a tube having an inner threaded hole defined in a first end thereof, a room defined in a second end of the tube, the tube having an inner threaded portion defined in an inner periphery thereof, a polygonal passage defined in the tube and located between the room and the inner threaded hole, a first slot and a second slot respectively defined through the tube and communicating with the room; a resilient plate located in the first slot and a protrusion extending angularly from a first end of the resilient plate, a hole defined through a second end of the resilient plate, a first bolt extending through the hole of the resilient plate, a second bolt located in the second slot of the tube; an adjusting member connected to the first end of the tube and having an outer threaded portion which is connected with the inner threaded hole of the tube, a space defined in the adjusting member and a polygonal hole defined through an end of the adjusting member, the polygonal hole communicating with the space; a spring located in the polygonal passage of the tube and the space of the adjusting member, a first end of the spring contacting an inside of the space of the adjusting member; a first block located in the room and the polygonal passage of the tube, a second end of the spring contacting the first block, the first block being a polygonal block and having a passage defined therethrough, multiple first teeth extending from a periphery of the first block; a second block located in the room of the tube and engaged with the first block, a first tubular portion and a second tubular portion respectively extending from two ends of the second block, the first tubular portion extending through the passage of the first block, the second block having a polygonal passage, multiple second teeth extending from a periphery of the second block and engaged with the first teeth; a stop located in the room of the tube and having a first side thereof contacting one side of the second block, the stop having a stepped hole, a threaded hole defined in a periphery of the stop and the first bolt threadedly engaged with the threaded hole, a positioning hole defined in the periphery of the stop and the second bolt threadedly engaged with the positioning hole, the resilient plate fixed to the stop by the first bolt; at least one disk located in the room of the tube and contacting a second side of the stop, multiple engaging teeth extending from a periphery of the at least one disk and the protrusion of the resilient plate engaged with the engaging teeth, the at least one disk having a polygonal hole and two first pin-holes, two pins respectively inserted into the two first pin-holes; a pushing member located in the inner threaded portion of the tube a cap connected to the second end of the tube and being made by electric-insulation material, a polygonal recess defined in a first end of the cap and multiple digits-and-marks being marked on an outside of the first end of the cap, a polygonal reception recess defined in a second end of the cap, and a link located in the polygonal reception recess of the cap and having a polygonal rod which is inserted into the two respective polygonal holes of the at least one disk and the pushing member.