Electrical wrench

Patent metadata

Field	Value
Publication number	US-9381625-B2
Application number	US-201314096224-A
Country	US
Kind code	B2
Filing date	Dec 4, 2013
Priority date	Dec 29, 2012
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

An electrical wrench includes a housing, a power member, a reversing mechanism, a support transmission assembly, an opening gear, a main control assembly and a restoring assembly. The housing includes having two projections, for example shaped as claws, arranged oppositely to cooperatively define an entrance. The power member, the reversing mechanism, the support transmission assembly and the opening gear are cooperatively coupled to one another and accommodated in the housing. The opening gear includes an outer teeth portion, an opening and a driving portion in communication with the opening, a tubular member for engaging with a fastener positioned in cooperation with the opening gear through the entrance. The restoring assembly includes an identifying portion, a sensor for sensing the position of the identifying portion, a control circuit board, a restoring switch and a restoring switch operator.

First claim

What is claimed is:

1. An electrical wrench for rotating a fastener, the electrical wrench comprising:
a housing having a handling portion and a mounting portion extending from one end of the handling portion along a length direction, the mounting portion comprising two projections arranged oppositely and the two projections cooperatively defining an entrance therebetween;
a drive assembly comprising a power member, a reversing mechanism, a support transmission assembly, and an opening gear wherein the power member, the reversing mechanism, the support transmission assembly and the opening gear are cooperatively coupled to one another and accommodated in the housing with the opening gear being rotatably arranged in the mounting portion and including an outer teeth portion for engaging with the support transmission assembly, an opening corresponding to the entrance and a driving portion in communication with the opening, wherein a width of the entrance and the opening is greater than or equal to a diameter or width of a tubular or cylinder member that is cooperative with the fastener, and wherein the driving portion is operable to rotate the fastener or an accessory for holding the fastener when positioned within the opening gear;
a main control assembly in communication with the drive assembly; and
a restoring assembly wherein the restoring assembly comprises an identifying portion which is arranged in a predetermined position on the opening gear or a predetermined position on the reversing mechanism for use in identifying a position of the opening of the opening gear, a sensor for sensing the position of the identifying portion, a control circuit board connected with the sensor, a restoring switch and a restoring switch operator such that, when the restoring switch is triggered via use of the restoring switch operator, the sensor is used to sense a presence of the identifying member and to generate an electrical signal which is transmitted to the control circuit board so that the control circuit board controls the drive assembly to rotate the opening gear into a predetermined position; and
wherein the main control assembly comprises a main switch, a main switch operator, and a switch driving member, wherein the control circuit board is provided with a control circuit for controlling the power member, and wherein the switch driving member is adapted to switch on/off the control circuit under the driving action of the main switch operator and the restoring switch operator.

2. The electrical wrench according to claim 1 , wherein the main switch operator and the restoring switch operator are arranged on opposite sides of the handling portion of the housing, wherein the switch driving member is arranged between the main switch operator and the restoring switch operator.

3. The electrical wrench according to claim 2 , wherein the restoring switch operator comprises a first lever and a second lever for pushing the switch driving member to switch on/off the main switch and the restoring switch respectively, wherein the switch driving member is rotatably mounted to the housing and comprises a first rotating arm and a second rotating arm abutting against the main switch operator and the first lever of the restoring switch operator respectively, a linkage member for driving the main switch to switch on/off, and an elastic restoring member, and wherein, under the action of the elastic restoring member, the first rotating arm is adapted to abut against the main switch operator or the second rotating arm is adapted to abut against the restoring switch operator.

4. The electrical wrench according to claim 1 , wherein the housing is configured as a substantially rod-type structure comprising a main housing extending along a longitudinal direction and a support housing extending from one end of the main housing, wherein a first end of the support housing is fixedly mounted in the main housing and a second end of the support housing opposite to the first end extends out of the main housing along the length direction of the housing, wherein the mounting portion is formed on an end of the support housing away from the main housing and comprises two substantially arc-shaped claws arranged oppositely, and wherein the two claws cooperatively define an accommodating hole communicated with the entrance and the opening gear is received in the accommodating hole.

5. The electrical wrench according to claim 1 , wherein the reversing mechanism is one of a ratchet mechanism or a bevel gear mechanism and wherein a speed reducing mechanism is arranged between the power member and the reversing mechanism, by which, after decelerating, the power provided by the power member is transmitted to the reversing mechanism.

6. The electrical wrench according to claim 5 , wherein the reversing mechanism is a ratchet mechanism comprising an eccentric shaft, a swinging member, a pawl, and a ratchet, wherein the eccentric shaft is pivotally connected to the support housing and connected with an output shaft of the power member by the speed reducing mechanism, wherein the pawl is pivotally connected to the swinging member, wherein the ratchet comprises an inner ring having a plurality of ratchet teeth for mating with the pawl and an outer ring having an outer teeth ring for engaging with the support transmission assembly, and wherein, under the action of the swinging member, the pawl is capable of being rotated in a first or second direction around a pivoting axis substantially perpendicular to a plane in which the swinging member is located such that, when the pawl rotates in the first direction, the pawl inserts into the ratchet teeth to push the ratchet to rotate in the same direction and, when the pawl rotates in the second direction, the pawl slips over the ratchet so that the ratchet stops rotating.

7. The electrical wrench according to claim 6 , wherein the power member comprises a motor and a power supply for providing electrical power to the motor, wherein the speed reducing mechanism is a planet gear speed reducing mechanism comprising a planet gear, an inner teeth ring, a planet carrier and a sun gear, wherein the sun gear is connected to the output shaft of the motor without rotation, wherein the planet gear is engaged with the sun gear and the inner teeth ring respectively, wherein the inner teeth ring is fixedly mounted to the support housing, wherein, under the driving action of the sun gear, the planet gear is capable of being rotated on its own axis to revolve around the output shaft of the motor along the inner teeth ring, wherein the planet carrier is fixedly provided with a projecting planet gear shaft around which the planet gear is rotatably mounted, and wherein the planer carrier is connected to the eccentric shaft without rotation.

8. The electrical wrench according to claim 7 , wherein the reversing mechanism comprises a reverser having a rotating shaft, an elastic assembly and an operator, wherein the swinging member is pivotally connected to the support housing by the rotating shaft, wherein one end of the elastic assembly abuts against the rotating shaft and the other end of the elastic assembly abuts against the pawl, wherein the pawl comprises a first pawl portion and a second pawl portion arranged symmetrically with each other along the pivoting shaft, wherein the elastic assembly is adapted to rotate under the action of the rotating shaft and abut against the first pawl portion or the second pawl portion, wherein the operator is connected to the rotating shaft without rotation such that the rotating shaft can be rotated under the action of the operator to change the abutting position of the elastic assembly on the pawl, thereby effecting a reverse action, wherein the rotating shaft defines a p

Assignees

• Chervon Hk Ltd
• Chevron Hk Ltd

Inventors

• Chen Liang
• Zhou Qiwei
• Chen Wu

Classifications

• B25B13/08

  of open jaw type · CPC title

• B25B21/00 Primary

  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

• B25B21/004 Primary

  of the ratchet type · CPC title

• B25B13/463

  a pawl engaging an externally toothed wheel · CPC title

• B25B13/46

  of the ratchet type, for providing a free return stroke of the handle · CPC title