Power tool and operation method for the power tool

Patent metadata

Field	Value
Publication number	US-9421681-B2
Application number	US-201213628580-A
Country	US
Kind code	B2
Filing date	Sep 27, 2012
Priority date	Aug 6, 2011
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

A power tool, including: a housing, a motor, arranged in the housing and outputting rotary force, a connecting shaft, adapted to one of a plurality of tool bits, a transmission mechanism, arranged between the motor and the connecting shaft and transmitting the rotary force from the motor to the connecting shaft, a cartridge, the cartridge includes a tool chamber for receiving the plurality of tool bits, the connecting shaft being capable of moving axially between a working position wherein the connecting shaft is adapted to the tool bits and a release position wherein the connecting shaft is separated from one of the plurality of tool bits, and a restricting member, the restricting member operable to move between two positions; at a first position, the restricting member limits the movement of the connecting shaft; and at a second position, the restricting member allows the connecting shaft to move.

First claim

The invention claimed is:

1. A power tool, comprising:
a housing;
a motor arranged in the housing, the motor being configured to output a rotary force;
an output shaft having a through hole configured to receive a first tool bit of a plurality of tool bits;
a transmission arranged between the motor and the output shaft, the transmission being configured to transmit the rotary force output by the motor to the output shaft;
a cartridge arranged in the housing, the cartridge comprising a tool chamber configured to receive the tool bits of the plurality of tool bits which are arranged in parallel;
a connecting shaft configured to move axially between
a working status wherein the connecting shaft is coupled with the first tool bit of the plurality of tool bits by passing through the tool chamber, and
a release status wherein the connecting shaft is separated from the first tool bit of the plurality of tool bits;

a restrictor arranged between the housing and the connecting shaft, the restrictor being configured to move between a first position and a second position; and
a slider coupled with the housing, the restrictor and the connecting shaft,
wherein
the slider is configured to cause the restrictor to be moved between the first position and the second position based on a movement of the slider,
the slider is configured to cause the connecting shaft to be moved between the working status and the release status based on the movement of the slider,
the restrictor is configured to limit the movement of the connecting shaft in a direction away from the first tool bit of the plurality of tool bits if the restrictor is in the first position,
the restrictor is configured to allow the connecting shaft to move in a direction away from the first tool bit of the plurality of tool bits so that the connecting shaft is located at the release status if the restrictor is in the second position, and
the slider is configure to move along an axial direction of the connecting shaft to cause the connecting shaft to move axially.

2. The power tool according to claim 1 ,
wherein the slider is provided with a release portion against the restrictor;
wherein the release portion drives the restrictor to move from the first position to the second position.

3. The power tool according to claim 2 , wherein one part of the cartridge is received in the housing, and the other part of the cartridge is covered by the slider and exposed along with the axial movement of the slider.

4. The power tool according to claim 3 ,
wherein one of the slider and the housing is provided with a guide slot along the axial direction of the connecting shaft, and the other one of the slider and the housing is provided with a guide rail matched with the guide slot; and
wherein the slider moves axially along the connecting shaft with respect to the housing by sliding of the guide rail in the guide slot.

5. The power tool according to claim 3 ,
wherein the slider is provided with a first protrusion and a second protrusion axially spaced apart from the first protrusion along the axial direction of the connecting shaft;
wherein the connecting shaft is provided with a fixed member at its one end, away from the cartridge; and
wherein the fixed member is axially fixed with respect to the connecting shaft and located between the first protrusion and the second protrusion and is capable of axially moving there-between.

6. The power tool according to claim 3 ,
wherein the housing can be divided into a motor portion for the motor, a transmission portion for the transmission and a storage portion for the cartridge along the axial direction of the connecting shaft;
wherein when the connecting shaft is located at the working status, the slider is axially overlapped with the transmission portion and the storage portion; and
wherein when the connecting shaft is at the release position, the slider is axially overlapped with the motor portion and partly overlapped with the transmission portion.

7. The power tool according to claim 1 ,
wherein one end of the connecting shaft is coupled with the transmission in a torque transmission way, and the other end of the connecting shaft is connected with the output shaft; and
wherein the connecting shaft is configured to cause the first tool bit of the plurality of tool bits to rotate via the output shaft.

8. A method performed by a power tool comprising a housing, a motor arranged in the housing, an output shaft, a transmission arranged between the motor and the output shaft, a cartridge arranged in the housing, a connecting shaft arranged in the housing, a restrictor arranged between the housing and the connecting shaft, and a slider coupled with the housing, the restrictor and the connecting shaft, the method comprising:
moving the slider to drive the restrictor to a predetermined position;
releasing a restriction on axial movement of the connecting shaft;
moving the slider to drive the connecting shaft to a release status;
selecting a first tool bit of a plurality of tool bits which are arranged in the cartridge; and
moving the slider, along an axial direction of the connecting shaft to cause the connecting shaft to move axially, to drive the connecting shaft from the release status to a working status,
wherein the connecting shaft is connected with the selected tool bit via the output shaft at the working status.

9. The method according to claim 8 , wherein one part of the cartridge is exposed along with a movement of the slider.

10. The power tool according to claim 1 , wherein the restrictor is rotatable around a pivot in parallel or vertical to the axial direction of the connecting shaft.

11. The power tool according to claim 1 , wherein the restrictor is movable linearly in a direction vertical to the axial direction of the connecting shaft.

12. The power tool according to claim 1 , wherein the restrictor comprises an elastic member resisting against the restrictor towards the first position.

13. The power tool according to claim 1 , wherein one end of the connecting shaft is connected with the transmission in torque transmission way, while the other end of the connecting shaft is capable of connecting with the output shaft and driving the tool bit.

14. The power tool according to claim 1 ,
wherein one part of the cartridge is received in the housing, and the other part of the cartridge is covered by the slider, and
wherein the other part of the cartridge is configured to be exposed along with the movement of the slider.

15. The power tool according to claim 14 ,
wherein one of the slider or the housing is provided with a guide slot along the axial direction of the connecting shaft, and the other of the slider or the housing is provided with a guide rail matched with the guide slot, and
wherein the slider moves axially along the connecting shaft with respect to the housing by sliding of the guide rail in the guide slot.

16. The power tool according to claim 15 ,
wherein the slider comprises a first protrusion and a second protrusion along the axial direction of the connecting shaft,
wherein the connecting shaft comprises a fixed member at one end, away from the cartridge, of the connecting shaft, and
wherein the fixed member is axially fixed with respect to the connecting shaft located between the first protrusion and the second protrusion, and configured to move axially between the first protrusion and the second protrusion.

17. The power tool according to claim 16 ,
wherein the housing comprises a motor portion housing the motor, a transm

Assignees

• Positec Power Tools Suzhou Co Ltd

Inventors

• Zhang Shisong
• Zhong Hongfeng
• Pang Xiaoli
• Xu Jingtao
• Andriolo Paolo
• Wang Kelvin
• Chen Zhi

Classifications

• B25D2250/111

  Bits, i.e. inserts or attachments for hammer, chisel, pick · CPC title

• B25B21/00

  Portable power-driven screw or nut setting or loosening tools; (details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00; {for mounting or dismounting wheels B60B29/006}); Attachments for drilling apparatus serving the same purpose (machines B23P19/06) · CPC title

• B25F1/04 Primary

  wherein the elements are brought into working positions by a pivoting or sliding movement · CPC title

• B25D16/00

  Portable percussive machines with superimposed rotation {, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit (combined percussion and rotary drilling adapted for earth drilling E21B6/00)} · CPC title

• Y10T483/1798

  including means to project tool from matrix · CPC title