Chuck

Patent metadata

Field	Value
Publication number	US-2018369928-A1
Application number	US-201816047137-A
Country	US
Kind code	A1
Filing date	Jul 27, 2018
Priority date	Jan 29, 2016
Publication date	Dec 27, 2018
Grant date	—

Abstract

The invention relates to a chuck having a sleeve, a chuck body, a plurality of chuck jaws, an adjusting mechanism configured to adjust relative movement between the chuck jaws and the chuck body, at least one locating member and a pushing mechanism. The locating member is disposed on the chuck body between the adjacent chuck jaws. When the adjusting mechanism drives the chuck jaws to approach to each other relative to the longitudinal axis, the pushing mechanism pushes the locating member to move towards the longitudinal axis. When the adjusting mechanism drives the chuck jaws to move away from each other relative to the longitudinal axis, the pushing mechanism pushes the locating member to move away from the longitudinal axis. Therefore, the operation is more convenient and safer; the aligning effect is precise and reliable, and the pre-tightening force is stable.

First claim

We claim:

1 . A chuck, comprising:
a sleeve; a chuck body rotatably disposed in the sleeve, wherein a longitudinal axis is defined extending along the direction of the chuck body; a plurality of chuck jaws configured to be distributed in the chuck body about the longitudinal axis being configured to be movable relative to the chuck body; an adjusting mechanism disposed between the sleeve and the chuck jaws being configured to adjust relative displacement between the chuck jaws and the chuck body; wherein the chuck further comprising at least one locating member being disposed between adjacent chuck jaws on the chuck body and a pushing mechanism, when the adjusting mechanism drives the chuck jaws moving close to the longitudinal axis, the locating member is driven by the pushing mechanism to move toward the longitudinal axis; and when the adjusting mechanism drives the chuck jaws moving away from each other along the longitudinal axis, the locating member is driven by the pushing mechanism to move away from the longitudinal axis.

2 . The chuck according to claim 1 , wherein the chuck body is provided with a first shaft cavity for receiving a tool bit, a plurality of first guide holes and at least one second guide holes are formed on a side wall of the chuck body and communicating with the first shaft cavity, and wherein the plurality of first guide holes are annularly distributed around the first shaft cavity, the chuck jaws respectively extends into the first shaft cavity through the first guiding hole and the locating member extending into the first shaft cavity through the second guide hole.

3 . The chuck according to claim 2 , wherein a center line of the first shaft cavity is coaxial with the longitudinal axis of the chuck body, and projections of the first guide holes and the second guide hole on the longitudinal axis are spaced apart.

4 . The chuck according to claim 3 , wherein when the sleeve rotates along a first direction relative to the chuck body, the locating member extends into the first shaft cavity close to the longitudinal axis through the second guide hole to hold the tool bit, and the chuck jaws extend into the first shaft cavity through the first guide holes and approach to each other relative to the longitudinal axis so as to clamp the tool bit received in the first shaft cavity of the chuck body, when the sleeve rotates in a second direction opposite to the first direction relative to the chuck body, the locating member moves away from the longitudinal axis, and the chuck jaws are apart from the longitudinal axis to release the tool bit received in the first shaft cavity of the chuck body.

5 . The chuck according to claim 4 , wherein the tool bit is held by the locating member before it is clamped by the chuck jaws.

6 . The chuck according to claim 2 , wherein the pushing mechanism comprises a first driving member sleeved on the chuck body and a first transmission mechanism for converting a rotation motion of the first driving member relative to the chuck body into a reciprocating motion of the first driving member along an axial direction of the chuck body.

7 . The chuck according to claim 6 , wherein the first transmission mechanism comprises a thread component disposed between an inner surface of the first driving member and an outer surface of the chuck body.

8 . The chuck according to claim 6 , further comprising a restricting mechanism disposed between the first driving member and the sleeve, the restricting mechanism is configured to prevent the first driving member from rotating relative to the sleeve.

9 . The chuck according to claim 8 , wherein the restricting mechanism comprises a first guide part disposed on the first driving member and extending along an axial direction of the first driving member, and a second guide part disposed on the inner wall of the sleeve and cooperating with the first guide part, one of the first guide part and the second guide part is configured as a guide rail and the other of the first guide part and the second guide part is configured as a guide groove to be engaged with the guide rail.

10 . The chuck according to claim 6 , wherein the pushing mechanism further comprises a first biasing member biased against the locating member, thus the locating member has a moving tendency to move away from the longitudinal axis.

11 . The chuck according to claim 10 , wherein the first driving member comprises a first inclined pushing surface, the locating member comprises a matching part abutting against the inclined pushing surface and a holding part for extending into the first shaft cavity.

12 . The chuck according to claim 11 , wherein the first biasing member is a spring sleeved around the holding part, one end of the spring abutting against the chuck body and the other end of the spring abuts against a step surface of the matching part.

13 . The chuck according to claim 2 , wherein the pushing mechanism comprises a second driving member coorperated with the locating member, and a second transmission mechanism for matching with the second driving member, the chuck jaws selectively abut against the second driving member to push the second driving member moving or to be separated from the second driving member, and when the chuck jaws abut against the second driving member and push the second driving member to move, the locating member is away from the longitudinal axis.

14 . The chuck according to claim 13 , wherein the pushing mechanism further comprises a second biasing member for providing a restoring force towards the longitudinal axis when the chuck jaws are separated from the second driving member.

15 . The chuck according to claim 14 , wherein the second transmission mechanism comprises a transmission member coupled to the second driving member and a support member fixedly disposed relative to the chuck body, the second biasing member is disposed between the transmission member and the support member.

16 . The chuck according to claim 1 , wherein the locating member is configured as a plurality of elastic locating members.

17 . The chuck according to claim 16 , wherein the elastic locating member comprises a holding part and an elastic cushion disposed at the end of the holding part away from the pushing mechanism, the elastic cushion is configured to provide elastic holding force to the tool bit.

18 . The chuck according to claim 1 , wherein amount of the locating members is consistent with that of the chuck jaws.

19 . The chuck according to claim 18 , wherein the locating members are respectively disposed between two adjacent chuck jaws.

20 . The chuck according to claim 1 , wherein the sleeve comprises a front sleeve and a rear sleeve coupled to the front sleeve, a screw nut is disposed between the rear sleeve and the chuck body.

Assignees

• Positec Power Tools Suzhou Co Ltd

Inventors

• Xie Mingjian
• Wang Fei
• Run Shangliang

Classifications

• B23B31/28

  using electric or magnetic means in the chuck · CPC title

• Y10T279/26

  with centering means · CPC title

• B23B31/12

  Chucks with simultaneously-acting jaws, whether or not also individually adjustable · CPC title

• B23B31/1238 Primary

  Jaws movement actuated by a nut with conical screw-thread · CPC title

• B23B2231/52

  Chucks with means to loosely retain the tool or workpiece in the unclamped position · CPC title