Power tool and operation method for quick locking and releasing working attachment thereof

Patent metadata

Field	Value
Publication number	US-10512971-B2
Application number	US-201414914944-A
Country	US
Kind code	B2
Filing date	Aug 28, 2014
Priority date	Aug 28, 2013
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

A power tool and operation method for quick locking and releasing working attachment thereof are provided. The power tool includes a housing; a motor in the housing; an output shaft driven by the motor; and a chuck to lock and release a working attachment, said chuck including a chuck body coupled with the output shaft, jaws movably disposed relative to the chuck body, and a clamping sleeve outside the chuck body. The clamping sleeve is movable with respect to the chuck body so as to drive the jaws to retract and open relative to the chuck body. A control mechanism is operable to lock the clamping sleeve or the chuck body relative to the housing, and to control the motor initiating along a preset rotary direction so that relative movement between the clamping sleeve and the chuck body is generated.

First claim

The invention claimed is:

1. A power tool comprising:
a housing;
a motor disposed in the housing;
an output shaft driven by the motor to output a rotary power; and
a chuck configured to lock and release a working attachment, said chuck comprises a chuck body coupled with the output shaft, a plurality of jaws movably disposed relative to the chuck body, and a clamping sleeve sleeved outside the chuck body, the clamping sleeve is movable with respect to the chuck body so as to drive the plurality of jaws to retract and open relative to the chuck body;
wherein the power tool further comprises a control mechanism, the control mechanism is operable to lock the clamping sleeve or the chuck body relative to the housing, and to control the motor initiating along a preset rotary direction so that relative movement between the clamping sleeve and the chuck body is generated;
wherein the control mechanism comprises a control member being operable to move between an initial position and a working position, the control mechanism is active when the control member is located at the working position;
wherein the power tool further comprises a reversing member for controlling the rotary direction of the motor, the control mechanism further comprises a first transmission mechanism connected between the control member and the reversing member, the reversing member is activated by the first transmission mechanism when the control member moves from the initial position to the working position; and
wherein the first transmission mechanism comprises a pair of reversing pushing blocks which are movably along the axial direction of the output shaft, and a reversing button which is movable along a direction perpendicular to the axial direction and is selectively slidable coupling with one of the reversing pushing blocks, the reversing pushing blocks are symmetrically disposed at two sides of the reversing button, the reversing button is configured to activate the reversing member.

2. The power tool according to claim 1 , wherein the control mechanism further comprises a connecting member connected with the control member, the connecting member is rotatable relative to the housing and provided with a pair of first slopes, the reversing pushing blocks are respectively provides with a first inclined plane abutted against the corresponding first slope and a second inclined plane abutted against the reversing button, the reversing button is provided with a pair of reversing slopes abutted against the second inclined planes respectively.

3. A power tool comprising:
a housing;
a motor disposed in the housing;
an output shaft driven by the motor to output a rotary power; and
a chuck configured to lock and release a working attachment, said chuck comprises a chuck body coupled with the output shaft, a plurality of jaws movably disposed relative to the chuck body, and a clamping sleeve sleeved outside the chuck body, the clamping sleeve is movable with respect to the chuck body so as to drive the plurality of jaws to retract and open relative to the chuck body;
wherein the power tool further comprises a control mechanism, the control mechanism is operable to lock the clamping sleeve or the chuck body relative to the housing, and to control the motor initiating along a preset rotary direction so that relative movement between the clamping sleeve and the chuck body is generated;
wherein the control mechanism comprises a control member being operable to move between an initial position and a working position, the control mechanism is active when the control member is located at the working position;
wherein the power tool further comprise a switch for switching on/off the motor, the control mechanism further comprises a second transmission mechanism connected between the control member and the reversing member, the switch is activated by the second transmission mechanism when the control member moves from the initial position to the working position; and
wherein the second transmission mechanism comprises a pushing button which is movable along the axial direction of the output shaft, the control mechanism further comprises a connecting member which is connected with the control member and rotatable relative to the housing, and the connecting member provided with a pair of second slopes, the pushing button is provided with a pair of pushing button slopes alternatively abutted against the second slopes, the pushing button is configured to activate the switch.

4. A power tool comprising:
a housing;
a motor disposed in the housing;
an output shaft driven by the motor to output a rotary power; and
a chuck configured to lock and release a working attachment, said chuck comprises a chuck body coupled with the output shaft, a plurality of jaws movably disposed relative to the chuck body, and a clamping sleeve sleeved outside the chuck body, the clamping sleeve is movable with respect to the chuck body so as to drive the plurality of jaws to retract and open relative to the chuck body;
wherein the power tool further comprises a control mechanism, the control mechanism is operable to lock the clamping sleeve or the chuck body relative to the housing, and to control the motor initiating along a preset rotary direction so that relative movement between the clamping sleeve and the chuck body is generated;
wherein the control mechanism comprises a control member being operable to move between an initial position and a working position, the control mechanism is active when the control member is located at the working position;
wherein the control mechanism further comprises a clutch mechanism disposed between the control member and the clamping sleeve, the clutch mechanism is configured to be in an engaging status and a separating status, the clutch mechanism converts from the separating status to the engaging status when the control member moves from the initial position to the working position, so that the clamping sleeve is fixed relative to the housing; and
wherein the clutch mechanism comprises a first clutch unit fixedly disposed relative to the clamping sleeve and a second clutch unit coupled with the control member, the second clutch unit is movable along the axial direction of the output shaft and is selectively engaged with the first clutch unit or separated from thereof.

5. The power tool according to claim 4 , wherein a stop device is disposed between the first clutch unit and the second clutch unit, the stop device is fixed relative to the housing, and a second spring is disposed between the stop device and the second clutch unit.

6. The power tool according to claim 5 , wherein a plurality of receiving chambers are disposed in the second clutch unit, and the second spring comprises a plurality of compression springs matched with the receiving chambers, the compression spring is at least partially supported in the receiving chambers.

7. The power tool according to claim 4 , wherein the control mechanism further comprises a transmission member which is disposed in the housing and coupled with the control member, the control member drives the second clutch to move along the axial direction of the output shaft by the transmission member when the control member moves from the initial position to the working position.

8. The power tool according to claim 7 , wherein a cam mechanism is disposed between the transmission member and the second clutch unit.

9. The power tool according to claim 8 , wherein the cam mechanism comprises a first cam part disposed in the transmission member and a second cam part disposed in the second clutch unit, the first cam part abuts against the second cam part by rotating of the control member and the second clutch unit moving along the

Assignees

• Positec Power Tools Suzhou Co Ltd

Inventors

• Zhong Hongfeng
• Zhang Shisong
• Ma Yichun
• Run Shangliang

Classifications

• B25F5/029

  with storage compartments (B25F5/027 takes precedence; handles with provisions for storing tool elements B25C1/08) · CPC title

• B23B31/10 Primary

  characterised by the retaining or gripping devices or their immediate operating means · CPC title

• B25F5/001 Primary

  Gearings, speed selectors, clutches or the like specially adapted for rotary tools · CPC title

• B23B2231/14

  Chucks with clamping force limitation means · CPC title

• B23B2231/06

  Chucks for handtools having means for opening and closing the jaws using the driving motor of the handtool · CPC title