KR101482009B1 - Tool clamping chuck and handpiece with the same - Google Patents

Abstract

Disclosed are a tool chuck having improved operation reliability and durability and a handpiece equipped with the same. The disclosed tool chuck comprises: a socket having a circular pipe shape; a clamp inserted in the socket to be closely fixed to the inner circumferential surface of the socket, having a tool opening formed in the front end center thereof to enable a tool to be inserted therein, and equipped with a plurality of elastic projections formed in the rear end thereof to be elastically biased towards the tool inserted through the tool opening; and a sliding member inserted in the socket, disposed in the rear of the clamp to be able to forwardly and backwardly slide and move with respect to the socket, and having a sloped surface contacting the elastic projections. The elastic projections have tool adhering surfaces formed on the inner surfaces thereof so that the outer circumferential surface of the tool is adhered and pressed and the tool is fixed to not be separated from the clamp. When the sliding member is forwardly pressed to be forwardly moved with respect to the socket, the elastic projections are pushed and spread by the slope surface so that the tool adhering surface is separated from the outer circumferential surface of the tool. When pressure applied to the sliding member is released, the elastic projections are elastically restored so that the tool adhering surface adheres and presses the outer circumferential surface of the tool. Also, the sliding member is pushed by the elastic projections to be backwardly returned with respect to the socket.

Description

{Tool clamping chuck and handpiece with the same}

The present invention relates to a handpiece used for elaborate manual work in the fields of, for example, dental surgery, dental treatment, skin treatment and the like.

In the fields of dental surgery, dental treatment, skin treatment, etc., elaborate manual work is required, and various types of handpieces are used for various fields. Generally, the handpiece has a configuration for rotating a tool for cutting or polishing at a high speed or irradiating a laser. A handpiece having a high-speed rotating abrasive tool is provided with a tool chuck for detachably engaging and fixing a polishing tool to the front end thereof.

1 is a cross-sectional view showing an example of a conventional handpiece tool chuck. Referring to FIG. 1, a tool chuck 10 includes a pipe passing through a rotation center of a turbine 5 rotating at high speed, A clamp 14 fitted in the socket 11 and a clamp pusher 12 fitted in the socket 11 in the rear of the clamp 14, And a shaft 7 extending in the longitudinal direction inside the handpiece (not shown).

When the tool 1 is mounted and fixed to the tool chuck 10, the rear end portion of the tool 1 is press-inserted through the opening at the center of the front end of the handpiece so that the inner circumferential surface of the clamp 14 rubs against the outer circumferential surface of the tool 1 As the tool 1 is inserted, the clamp 14 is also retracted back to the hand piece. Thus, the tool pressing surface of the front end inner circumferential surface of the clamp 14 is changed from the open state (see the chain double-dashed line) to the closed state (see the solid line), and is firmly brought into close contact with the outer peripheral surface of the tool 1, 1) is fixed.

Conversely, when detaching the tool 1 from the tool chuck 10, when the shaft 7 is pushed forward, the clamp pusher 12 is pushed by the shaft 7 to press the clamp 14 forward, 14) The tool pressing surface on the inner peripheral surface of the sheave is changed from the broken state (see the solid line) to the opened state (see the chain double-dashed line) and is separated from the outer peripheral surface of the tool 1. At this time, the handpiece user can separate the tool 1 from the handpiece through the opening at the center of the front end of the handpiece.

 Since the tool 1 must be forcedly inserted through the front opening of the handpiece when the tool 1 is mounted on the tool chuck 10 in the case of the tool chuck 10, Particle generation and friction reduction may occur between the outer circumferential surfaces, between the outer circumferential surface of the clamp 14 and the inner circumferential surface of the socket 11, and between the outer circumferential surface of the clamp pusher 12 and the inner circumferential surface of the socket 11. Therefore, the operation durability of the tool chuck 10 can be deteriorated.

Korean Utility Model Registration No. 20-0458969

The present invention provides a tool chuck having improved operational reliability and durability, and a handpiece having the tool chuck.

In addition, the present invention provides a tool chuck capable of being fixedly mounted on a tool chuck by being manually press-fit through a front end opening of a handpiece, Piece.

The present invention relates to a socket having a circular pipe shape for holding a tool so as not to be separated and fixed to the inner circumferential surface of the socket by being inserted into the socket and having the tool inserted in the center of the front end A clamp formed with a tool opening and having a plurality of resilient projections elastically biased at a rear end thereof toward a tool inserted through the tool opening; and a clamp inserted into the socket, And a sliding member provided on the rear side of the clamp so as to be able to slide back and forth so as to be slidable in contact with the plurality of elastic protrusions, wherein the plurality of elastic protrusions has an outer peripheral surface And a tool contact surface for tightly pressing the tool so that the tool is not separated against the clamp, and the sliding member is urged forward The plurality of elastic protrusions are pushed by the inclined surface to separate the tool contact surface from the outer peripheral surface of the tool, and when the pressing on the sliding member is released, the plurality of elastic protrusions are elastically restored Wherein the tool contact surface closely presses the outer circumferential surface of the tool and the sliding member is pushed by the plurality of elastic protrusions to return back to the socket.

The tool chuck of the present invention may further include a stopper pin which interrupts the socket and the sliding member and prevents the tool inserted through the tool opening from further entering backward.

A pin hole through which the stopper pin passes is formed on a side surface of the sliding member and the pin hole may extend in the longitudinal direction of the sliding member so that the sliding member can move back and forth with respect to the pin hole .

The tool contact surface may protrude stepwise from the inner side surfaces of the elastic protrusions.

The present invention also provides a tool chuck comprising a tool chuck, a tool detachably fixed to the tool chuck, a rotation unit rotating the tool fixed to the tool chuck at a high speed, a shaft extending along a rotation center line of the tool behind the slide member wherein the shaft is moved forward to push the sliding member forward, and when the knob is moved backward, the shaft is moved backward, and the shaft is moved backward, And the handpiece is configured such that the pressing on the sliding member is released.

The handle may have a shaft supporting member for supporting a rear end of the shaft on the inside thereof, and the shaft may be elastically biased in a direction in which the shaft is in close contact with the shaft supporting member.

The handle may be configured to move forward when it is rotated in one of the clockwise and counterclockwise directions with respect to the rotational center line of the tool, and to move backward when it rotates in the opposite direction.

According to the present invention, the shaft moves backward or forward according to the direction in which the operator turns the handle of the handpiece, and the clamp of the tool chuck interlocks with the tool to fix or unlock the tool. Then, the clamp does not move in the forward and backward directions with respect to the socket, and the tool contact surface of the clamp does not apply a frictional force to the tool in the longitudinal direction of the tool, except when it is intended to force the tool out of the tool chuck. Therefore, wear and damage of the tool contact surface can be reduced, thereby improving the operation reliability and durability of the tool chuck.

1 is a cross-sectional view showing an example of a conventional handpiece tool chuck.
2 is a perspective view of a handpiece according to an embodiment of the present invention.
3 is an exploded perspective view of the handpiece head of Fig.
Fig. 4 and Fig. 5 are exploded perspective views of the tool chuck of Fig. 2, Fig. 4 is a front view, and Fig. 5 is a rear view.
6 is a partially enlarged perspective view of the clamp of Fig.
Figs. 7 and 8 are sectional views of the handpiece of Fig. 2, Fig. 7 shows a state where the tool is fixed to the tool chuck, and Fig. 8 shows a state where the tool is not fixed to the tool chuck, respectively.

Hereinafter, a tool chuck and a handpiece including the tool chuck according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. The terminology used herein is a term used to properly express the preferred embodiment of the present invention, which may vary depending on the intention of the user or operator or the custom in the field to which the present invention belongs. Therefore, the definitions of these terms should be based on the contents throughout this specification.

FIG. 2 is a perspective view of a handpiece according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of the handpiece head of FIG. 2. FIG. 2 and 3, the handpiece 20 according to the embodiment of the present invention has a cylindrical bar shape extending in one direction along the center line CL, and is used for dental pore work. The handpiece 20 has means for fixing the work tool 90 to the head 40 at the front end and rotating the tool 90 at a high speed. A cutting or polishing operation can be performed using the handpiece 20 according to the shape of the replaceable tool 90. [ Since the tool 90 rotates at a high speed with respect to the center line CL, the center line CL is also the center line of rotation of the tool 90. [

The handpiece 20 has the head 40, the central barrel 21, the handle 25 for operating the tool chuck 70, and the rear end barrel 23 in the front-to-rear direction along the center line CL. A pipe holder 24 is fixedly secured to the inner peripheral surface of the rear end barrel 23 and a driving air inlet for introducing high speed air for rotating the tool 90 at a high speed is provided in the pipe holder 24. [ A pipe 34 and a driving air outlet pipe 35 for discharging the air that has flowed into the handpiece 20 and rotated at a high speed of the tool 90 to the outside of the handpiece 20 are fixedly fastened. At least one of the pipes 34, 35 may be connected to a blower (not shown) outside the handpiece 20. The pipe holder 24 is provided with an air inflow pipe 30 into which air blown out forward from the head 40 flows and a water inflow pipe 31 into which water sprayed forward from the head 40 flows, Respectively.

The head 40 has a nose cap 43 and a head barrel 41 surrounding the nose cap 43. A turbine seating groove (not shown) which is opened rearward is formed in the nose cap 43, and a turbine 66 is rotatably inserted and supported by the first and second bearings 64 and 65. The tool chuck 70 is inserted in the center of the turbine 66, the first bearing 64, and the second bearing 65 and is disposed on the center line CL. The tool 90 can be inserted into the head 40 through the opening 44 in the center front face of the nose cap 43 and inserted into the tool chuck 70 and locked in place.

An inner frame 36 (see Figs. 7 and 8) is disposed in the rear of the nose cap 43 on the inner side of the central barrel 21. The inner frame 36 is coupled to the nose cap 43 and the end of the driving air outlet pipe 35 extended to the inside of the central barrel 21 is connected to the air outlet port 35 formed in the inner frame 36, (See Figs. 7 and 8). The air introduced into the handpiece 20 through the driving air inlet pipe 34 while the tool 90 is held by the tool chuck 70 rotates the turbine 66 at a high speed, ) Rotates at a high speed. The air having rotated the turbine (66) flows out to the rear of the handpiece (20) through the air outlet channel (37) and the driving air outlet pipe (35). In the embodiment of the present invention shown in the drawings, only the rotating unit having the turbine 66 is disclosed as means for rotating the tool 90 fixed to the tool chuck 70 at a high speed, but the present invention is limited to this For example, a rotating unit having a motor is also applicable.

An air jet nozzle tube 53 in which air is blown forward at a high speed forward in the head 40 in order to clean the polished material by blowing the high speed rotation of the tool 90 and blow off the powder off the material, A water spray nozzle tube 57 is provided. Specifically, the nozzle tubes 53 and 57 are inserted into the nose cap 43 so that the front ends of the air injection nozzle tube 53 and the water injection nozzle tube 57 are exposed forward of the nose cap 43, As shown in Fig. The air inflow pipe 30 and the water inflow pipe 31 are inserted into the nose cap 43 across the inside of the handpiece 20 and are inserted into the nose cap 43 through the air injection nozzle pipe 53, And is connected to the injection nozzle tube 57. Accordingly, when air or water is supplied to the handpiece 20 through the air inflow pipe 30 or the water inflow pipe 31, air is blown through the air injection nozzle pipe 53 or the water injection nozzle pipe 57, Air or water is injected to the front of the air conditioner 20.

4 and 5 are exploded perspective views of the tool chuck of FIG. 2, wherein FIG. 4 is a front view, FIG. 5 is a rear view, and FIG. 6 is a partially enlarged view 7 is a cross-sectional view of the handpiece shown in Fig. 2, Fig. 7 shows a state in which the tool is fixed to the tool chuck, and Fig. 8 shows a state in which the tool is not fixed to the tool chuck .

4 to 6, the tool chuck 70 includes a circular pipe-shaped socket 71, a clamp 80, a sliding member (not shown) 76, and a stopper pin 89, as shown in FIG. The socket 71 is fixed to the through hole 68 passing through the center of the first bearing 64, the turbine 66, and the second bearing 65. The outer circumferential surface of the socket 71 is tightly fixed to the inner circumferential surface of the through hole 68. When the turbine 66 rotates at high speed, the socket 71 rotates together with the turbine 66 at a high speed.

The clamp 80 has a tool opening 81 in which the tool 90 is inserted at the center of the front end portion and has three elastic protrusions 83 at the rear end portion thereof. When the clamp 80 is inserted into the socket 71 through the opening of the front end of the socket 71, the outer peripheral surface 82 of the front half of the clamp 80 is fixedly fixed to the inner peripheral surface of the front half of the socket 71 do. The three elastic protrusions 83 are elastically biased to face the tool 90 inserted into the clamp 80 through the tool opening 81. The three elastic projections 83 are designed to be pushed toward the rotation center line CL and when the tool 90 is inserted into the tool opening 81, three elastic projections 83 are formed on the outer peripheral surface of the tool 90, Respectively.

Specifically, each of the elastic projections 83 has a tool contact surface 85 and a sliding member contact surface 84 formed on the inner surface thereof. The sliding member contact surface 84 is formed at the distal end of the elastic projection 83 and the tool contact surface 85 is formed at the front side thereof. The tool contact surface 85 protrudes stepwise from the inner surface of the elastic projection 83 and the sliding member contact surface 84 is inclined to be spaced apart from the rotation center line CL toward the distal end of the elastic projection 83. [

The sliding member 76 is inserted into the socket 71 through the opening at the rear end of the socket 71 and is slidable and movable back and forth within the socket 71 and disposed behind the clamp 80. The sliding member 76 is formed in a cylinder shape whose rear end is closed and has an inclined surface 79 at its front end portion which is in contact with the sliding member contact surface 84 of the three elastic protrusions 83.

The stopper pin 89 is inserted into a pin hole 73 formed in a side surface of the socket 71 and a pin hole 77 formed in a side surface of the sliding member 76 to form the socket 71 and the sliding member 76, As shown in FIG. The pin hole 73 of the socket 71 is formed as a through hole having an inner diameter corresponding to the diameter of the stopper pin 89 and the pin hole 77 of the sliding member 76 is formed in the longitudinal direction of the sliding member 76 . The sliding member 76 is movable back and forth with respect to the stopper pin 89 within a range of the extended length of the pin hole 77 while being fitted to the stopper pin 89. [ FIG. 7 shows a state in which the sliding member 76 is moved backward, and FIG. 8 shows a state in which the sliding member 76 has moved forward.

On the other hand, the stopper pin 89 interrupts the rear end of the inserted tool 90 through the tool opening 81 of the clamp 80, thereby preventing the tool 90 from further entering backward. This prevents insertion of the tool 90 too deeply through the tool opening 81 to prevent damage and failure.

7, when the sliding member 76 is moved forward relative to the fixed socket 71, the sliding member contact surfaces 84 of the three elastic protrusions 83 are inclined with respect to the inclined surface So that the tool contact surface 85 is spaced apart from the outer peripheral surface of the rear end of the tool 90. The tool 90 is not engaged with the tool chuck 70 and the operator grips the front end of the tool 90 by hand and pulls the tool 90 forward to pull the tool 90 out of the tool chuck 70 .

8, when the pressing on the sliding member 76 is released, the respective elastic projections 83 are retracted by the elastic restoring force, so that the tool contact surface 85 contacts the outer peripheral surface of the rear end of the tool 90 Tightly. The sliding member 76 moves back relatively to the socket 71 fixed to the sliding member contact surface 84 in accordance with the backward contact with the inclined surface 79 and returns to the original position. As a result, the tool 90 becomes engaged with the tool chuck 70 and the tool 90 held by the tool chuck 70 is rotated at a high speed when the turbine 66 rotates at a high speed.

Referring to FIGS. 7 and 8 together, the handle 25 of the handpiece 20 is a ring-shaped member configured to be gripped by the operator's hand and moved back and forth. 8, the handle 25 is supported by the central barrel 21 and the rear barrel 23, and when the barrel 25 is rotated in one of the clockwise and counterclockwise directions, And moves backward with respect to the rear central barrel 23 and, when it rotates in the opposite direction, to the fixed central barrel 21 and rear barrel barrel 23 as shown in Fig.

On the other hand, behind the sliding member 76, a shaft 27 extending along the rotation center line CL of the tool 90 is provided. On the inner side of the handle 25, a shaft supporting member (Not shown). The shaft 27 passes through the inner frame 36 and the front end of the shaft 27 is disposed to face the rear end of the sliding member 76.

The shaft 27 is configured to be elastically biased in a direction in which its rear end is in close contact with the shaft support member 26. Specifically, a spring support flange 28 is formed radially at an intermediate point of the shaft 28, and a compression spring 29 is interposed between the flange 28 and the inner frame 36. Therefore, the flange 28 is elastically pressed by the compression spring 29, so that the shaft 28 always comes in tight contact with the shaft supporting member 26. [

With this configuration, when the operator rotates the knob 25 in one direction in the clockwise and counterclockwise directions, the knob 25 moves forward as shown in FIG. 8, the shaft 27 advances and the sliding member 76 Is pressed forward. Whereby the tool 90 is engaged and fixed to the tool chuck 70 as described above. On the other hand, when the operator rotates the handle 25 in the opposite direction, the handle 25 moves backward as shown in Fig. 7 and the shaft 27 is moved backward by the elastic force of the compression spring 29, The pressing of the shaft 27 with respect to the shaft 27 is released. As a result, the sliding member 76 moves backward to return to the original position, and the tool 90 is not fixed to the tool chuck 70 as described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

20: Handpiece 21: Central barrel
23: rear end barrel 25: chuck adjusting knob
30: air inlet pipe 31: water inlet pipe
40: head 41: head tube
70: tool chuck 71: socket
80: Clamp 90: Tool

Claims (7)

By holding the tool so that it is not separated,
A circular pipe-shaped socket;
A tool opening is formed in the center of the front end portion to insert the tool, and an elastic bias is applied to the rear end portion of the tool through the tool opening, A clamp having a plurality of elastic protrusions; And
And a sliding member which is inserted into the socket and is slidable back and forth with respect to the socket and which is movably disposed at the rear of the clamp and is formed with an inclined surface contacting with the plurality of elastic projections,
Wherein the plurality of elastic protrusions have a tool contact surface for pressing and pressing the outer circumferential surface of the tool against the inner surface thereof so as not to separate the tool from the clamp,
When the sliding member is pressed forward and moved forward with respect to the socket, the plurality of elastic protrusions are pushed by the inclined surface to separate the tool contact surface from the outer peripheral surface of the tool, and when the pressing on the sliding member is released, Is resiliently restored so that the tool contact surface closely presses the outer circumferential surface of the tool and the sliding member is pushed by the plurality of elastic protrusions to return back to the socket. The method according to claim 1,
Further comprising a stopper pin across the socket and the sliding member, the stopper pin preventing further insertion of the tool inserted through the tool opening. 3. The method of claim 2,
A pin hole through which the stopper pin passes is formed on a side surface of the sliding member and the pin hole extends in the longitudinal direction of the sliding member so that the sliding member can move back and forth with respect to the pin hole . The method according to claim 1,
Wherein the tool contact surface protrudes stepwise from an inner surface of each of the elastic protrusions. A tool chuck as claimed in any one of claims 1 to 4;
A tool detachably secured to the tool chuck;
A rotating unit for rotating the tool fixed to the tool chuck at a high speed;
A shaft extending along a rotational center line of the tool behind the sliding member; And
And a handle configured to move by hand and move back and forth,
Wherein when the handle is moved forward, the shaft is advanced so that the sliding member is pressed forward, and when the handle is moved back, the shaft is moved backward to release the pressing on the sliding member. . 6. The method of claim 5,
Wherein the handle is provided with a shaft support member for supporting a rear end of the shaft inside the handle, and the shaft is elastically biased in a direction in which the shaft is in close contact with the shaft support member. 6. The method of claim 5,
Wherein the handle is configured to move forward when it is rotated in one of clockwise and counterclockwise directions with respect to the rotational center line of the tool, and to move backward when it is rotated in the opposite direction.

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