Chuck capable of drawing in and pushing out collet

A chuck is composed of a collet sleeve, a sliding member, at least one linkage member, a collet, and a driving member. The collet sleeve includes an axial hole running therethrough and at least one opening in communication with the axial hole. The sliding member is slidably received in the axial hole of the collet sleeve. The linkage member is inserted through the opening of the collet sleeve and connected to the sliding member. The collet is inserted into the axial hole of the collet sleeve and connected to the sliding member. The driving member drives the linkage member and the sliding member to move for drawing in and pushing out the collet with respect to the collet sleeve.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a chuck for holding a bar stock, and more particularly to a chuck, which is capable of drawing in and pushing out a collet.

2. Description of the Related Art

When an operator wants to replace a drill of a drill machine, a chuck has to be disassembled from a spindle of the machine first. Then disassembling a collet out of the chuck by a tool to replace the drill.FIG. 1shows a conventional chuck, which includes a collet sleeve1, a collet2, and a draw bar3. The collet sleeve1has an axial hole therein for slidably receiving the collet2. The draw bar3is engaged with a screw hole2aof the collet2for drawing the collet2in the axial hole1aof the collet sleeve1. When replacing the drill (not shown), the operator must screw out the draw bar3by a hexagonal wrench4first, and then hammer the chuck by a hammering tool (not shown) to depart the collet2from the axial hole1aof the collet sleeve1to replace the drill. However, the aforementioned replacing procedure is too complicated to be easy and efficient.

SUMMARY OF THE INVENTION

The primary objective of the invention is to provide a chuck, which can draw in and push out a collet easily and rapidly.

The foregoing objective of the present invention is attained by the chuck, which is composed of a collet sleeve, a sliding member, at least one linkage member, a collet, and a driving member. The collet sleeve includes an axial hole running therethrough and at least one opening in communication with the axial hole. The sliding member is slidably received in the axial hole of the collet sleeve. The linkage member is inserted through the opening of the collet sleeve and connected to the sliding member. The collet is inserted into the axial hole of the collet sleeve and connected to the sliding member. The driving member drives the linkage member and the sliding member to move for drawing in and pushing out the collet with respect to the collet sleeve.

DETAIL DESCRIPTION OF THE INVENTION

Referring toFIG. 2, a chuck constructed according to a first preferred embodiment of the present invention is composed of a collet sleeve10, a sliding member20, four linkage members30, a driving member40, and a collet50.

The collet sleeve10includes an axial hole11running therethrough, a taper-shaped engaging hole12at a lower section of the axial hole11for stably receiving the collet50, four elongated openings13at the midsection thereof equidistantly disposed around the collet sleeve10and communicating with the axial hole11, and a concave and arched first annular groove14positioned at an outer side thereof and under the elongated openings13.

The sliding member20embodied as a circular column is received in the midsection of the axial hole11of the collet sleeve10for slidably traversing along the axial hole11. The sliding member20includes four screw holes21disposed equidistantly at an outer periphery thereof, and two O-rings22fitted onto the outer periphery thereof and engaged against a periphery of the axial hole11. The sliding member20further has a screw segment23at a distal section thereof for connected with a screw hole51positioned at an upper section of the collet50, such that the collet50can slidably move along with the sliding member20.

The linkage members30(only one linkage member30shown inFIG. 2) embodied as screw shafts are respectively inserted through the openings13of the collet sleeve10and are screwed into the screw holes21of the sliding member20at a distal end thereof so as to be fixedly connected with the sliding member20. Each of the linkage members30has a rack31at the other distal end thereon. The sliding member20is restricted by the linkage members30and the openings13of the collet sleeve10, thereby preventing the sliding member20from rotation inside the axial hole11.

The driving member40embodied as an annular sleeve is fitted onto an outer periphery of a midsection of the collet sleeve10. The driving member40includes a thread41at an inner periphery thereof for threadedly engaged with the rack31of each of the linkage members30, an arched second annular groove42at the inner periphery thereof corresponding to the first annular groove14of the collet sleeve10, and a through hole43running through the driving member40for communicating the second annular groove42with the outside of the driving member40. A plurality of metal balls60are received and filled in a space defined by the second annular groove42of the driving member40and the first annular groove14of the collet sleeve10, i.e. the metal balls60are partially embedded into the through hole43and the first annular groove14. A pin44is inserted into the through hole43to seal the through hole43for preventing the metal balls60from escape the through hole43, such that the driving member40can be rotatable merely within the midsection of the collet sleeve10.

In operating, turn the driving member40to drive the linkage members30to move upwards. In the mean time, the sliding member20and the collet50are driven to move upwards (as shown inFIG. 2), and thereby the collet50is gradually fixedly received in the axial hole11.

On the contrary, turn the driving member40in an opposite direction to drive the linkage members30and the sliding member20to move downwards such that the collet50is driven to move downwards. In the mean time, a bottom end of the collet50is protruded out of the collet sleeve10, as shown inFIG. 3. Thus, turn the collet50to allow the collet50to be detached from the sliding member20, thereby removing the collet50from the chuck.

Referring toFIGS. 4–5, a chuck of a second preferred embodiment of the present invention is constructed similarly to the chuck of the first preferred embodiment and composed of the collet sleeve10, the sliding member20, the four linkage members70, the driving member40, and the collet50. The difference between the two preferred embodiments lies in that the linkage members70includes two threads71and72respectively positioned at two distal ends thereof, and the collet sleeve10further includes an annular portion15having an annular recess16at a bottom side thereof and a seal ring17received in the annular recess16, and a driven ring80fitted onto the midsection of the collet sleeve10and having an outer thread81at an outer periphery thereof, four concavities82formed at the outer periphery thereof, and four slots83respectively positioned in the four concavities82.

Referring toFIG. 4, while assembling, put the sliding member20to be received in the axial hole11, insert the threads71of the linkage members70respectively through the openings13of the collet sleeve10to be screwed respectively into the screw holes21of the sliding member20, the driven ring80is cut into two semi-annular members that positioned by two steel needles84to be mounted around the collet sleeve10and covered on the openings13, and meanwhile, the linkage members70are respectively embedded into the slots83. Then, put a screw nut90to be screwed onto the threads72of the linkage members70and received in each of the concavities82. Finally, allow the thread41of the driving member40to be threadedly engaged with the outer thread81of the driven ring80, allow the driving member40to contact against the seal ring17, and put the metal balls60into the first and second annular grooves14and42between the collet sleeve10and the driving member40.

The operation of the second preferred embodiment is similar to the first preferred embodiment but is characterized by that the thread41of the driving member40is connected with the driven ring80to allow the driving member40to indirectly and more stably drive the sliding member20to traverse while the driving member40is rotated.

The advantage of the present invention lies in that it is unnecessary to disassemble the collet sleeve from a tool machine while replacing the drill. It is as easy as turning the driving member to complete the aforementioned replacing procedure, thereby overcoming the drawback of the prior art.