Patent ID: 9095960
Filing Date: 2015-08-04
Classification: B25B,B60B

Abstract:
1. A torque control wrench assembly for a vehicle, comprising: a handle for generating rotational force; a ratchet unit having a first ratchet for rotating in engagement with the handle and a second ratchet engaged with the first ratchet, for transferring rotational force applied from the first ratchet; a transmission unit engaged with the second ratchet, for changing the rotational force transferred from the second ratchet; a socket unit having one end engaged with the transmission unit and the other end engaged with a wheel nut, for tightening or loosening the wheel nut by receiving the rotational force; a housing opened at both ends, for accommodating the ratchet unit and the transmission unit; and a torque control unit into which the first ratchet is inserted and which is engaged with the housing, covering an opened end of the housing, for controlling the rotational force applied to the socket unit by pressing the first ratchet and thus controlling engagement strength between the first and second ratchets, wherein the torque control unit comprises: a washer unit for pressing or releasing the first ratchet; and a pressure control unit engaged with the housing, covering the opened end of the housing, for controlling pressure that the washer unit applies to the first ratchet by pressing or releasing the washer unit, wherein the washer unit comprises: a first washer having a height increasing toward a center of the first washer, for allowing the first ratchet to be inserted thereinto in close contact with one surface of the first ratchet; and a second washer having a height increasing toward a center of the second washer and closely contacting the first washer, for allowing the first ratchet to be inserted thereinto, wherein the pressure control unit comprises: a first pressure controller engaged with the housing, covering the opened end of the housing, for allowing the first ratchet to be inserted thereinto; a second pressure controller rotatably engaged with the first pressure controller, for allowing the first ratchet to be inserted thereinto and pressing the second washer by rotating in a direction in close contact with one surface of the second washer; a fastening portion located along an outer circumferential surface of a center hole of the second pressure controller and interposed between the first pressure controller and the first ratchet, wherein the fastening portion is mounted at the center hole of the first pressure controller such that the second pressure controller is rotatably engaged with the first pressure controller by the fastening portion, and the second pressure controller presses or releases the second washer by the fastening portion, and a locker installed at the second pressure controller, for fixedly locking the second pressure controller at a rotated position, wherein an installation hole penetrates through the second pressure controller, for allowing the locker to be inserted thereinto, wherein at least one locking groove is formed into a surface of the first pressure controller that contacts the second pressure controller, wherein the locker comprises: a ball inserted into the installation hole and partially inserted into the at least one locking groove; a spring inserted into the installation hole to elastically support the ball; and a cover screwed into the installation hole, for fixedly positioning the spring.