JP2603186B2 - Dental centrifugal casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental centrifugal casting machine for casting a crown or the like.

[0002]

2. Description of the Related Art Conventionally, a spring force is accumulated in a torsion drive spring,
Due to this spring force, the centrifugal rotator having the casting link and the crucible having the mold therein is centrifugally rotated, and the molten metal in the crucible heated and melted by the centrifugal force is injected into the mold to form a crown or the like. Dental centrifugal casters for casting are known.

[0003]

However, according to the conventional centrifugal dental casting machine, since the spring force is accumulated by manually rotating the centrifugal rotating body, the rotating operation is inconvenient. When the casting operation is to be performed continuously, heat generated when the metal is melted by heating the crucible remains in the centrifugal rotator, so that the centrifugal rotator cannot be continuously rotated. There was an inconvenience.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned disadvantages of the prior art, a rotating shaft is rotated by a spring force accumulated in a torsion drive spring, and a casting ring and a crucible are provided by the rotating shaft. A dental centrifugal casting machine configured to centrifugally rotate a centrifugal rotating body, wherein a handle member is connected to one end of the torsion drive spring via a ratchet mechanism that rotates cooperatively only in one direction, and twists. The other end of the drive spring is connected to clutch means comprising a pair of clutch pieces which can be brought into contact with and separated from each other and fixed to the rotating shaft in the joined state, and further, a first means for restraining the centrifugal rotating body. A stopper rod movable between a position and a second position for releasing the restraint, and the stopper rod and the clutch means are moved in a first position of the stopper rod into a pair of clutches. The clutch pieces are joined, and at a second position of the stopper rod, the clutch pieces are joined by a clutch operating mechanism that disengages the pair of clutch pieces. The rotating shaft and the stopper rod are vertically parallel to the hollow housing that has been set up, and
Disposed in the axial direction, a handle member is connected to one end of the upper rotating shaft via a ratchet mechanism, and a centrifugal rotating body and a pair of clutch pieces are connected to the other end of the rotating shaft. A spring for urging in the separating direction, a knob attached to one end of the lower stopper rod facing the handle member, and a centrifugal rotating body attached to the other end when the stopper rod moves to the first position. And a ratchet mechanism is rotatably supported on the housing, and the end of the rotating shaft is rotatable and axially movable in the center at the center. Along with the bearing, a receiving part holding one end of a torsion drive spring at the inner end is provided on a shaft piece provided with a ratchet gear at the outer end, and a handle member rotatably attached to the shaft piece, One-way rotation of the handle member And a ratchet pawl that meshes with the ratchet gear only, and is provided on the housing and is released from the ratchet gear in one rotation of the handle member and meshes with the ratchet gear in another rotation of the handle member. A ratchet pawl that restrains rotation, and a clutch actuating mechanism that is bent in the shape of a letter, and the bent portion is formed of a crank piece that is pivotally attached to a housing, and one of the pieces is fixed to a rotating shaft. One of the clutch parts is connected so as to be freely rotatable in the rotational direction, and the other is provided with a sliding groove for slidably engaging a pin provided on a stopper rod. In the above, a micro switch for turning on a display unit provided on the housing surface when the stopper rod is moved to the first position is provided so that a safe operation can be performed, and the torsion drive spring has a sufficient spring force. In this case, a micro switch is provided which is activated by the extension of the entire length to turn on a display unit provided on the surface of the housing. Means are provided between the stopper rod and the housing to selectively restrict the first position and the second position of the stopper rod, respectively.

[0005]

In the same manner as before, the centrifugal rotating body is equipped with a casting ring and a crucible, and the balance weight is adjusted so that the centrifugal rotating body is leveled, and the stopper rod is pressed. When the stopper is moved to the first position, the locking portion at the tip thereof engages with the engagement hole provided in the centrifugal rotator to restrain the centrifugal rotator and to operate the clutch with the movement of the stopper rod to the first position. A pair of clutch pieces are joined by a mechanism to fix the other end of the torsion drive spring to the rotating shaft. Next, when the handle member is reciprocated from this state, the ratchet mechanism cooperates only in one direction of rotation, so that one end of the torsion drive spring is caught only in one direction by the reciprocating operation of the handle member. Thus, spring force is accumulated in the torsion drive spring. Then, in this state, the metal in the crucible is heated and melted, and then the stopper rod is pulled forward to release the locking between the locking portion and the locking hole and release the restraint of the centrifugal rotating body. The centrifugal rotation of the centrifugal rotator is performed by instantaneously rotating the rotating shaft at high speed due to the spring force accumulated in the crucible, and the molten metal in the crucible is injected into the mold by centrifugal force, for example, the crown is cast. You. On the other hand, since the total length of the torsion drive spring is reduced by releasing the spring force of the torsion drive spring, the joining of the pair of clutch parts is released and the casting operation is completed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. A vertically long cubic case 2 is erected on a trapezoidal base plate 1, and the case 2 A lid 2a is attached to the side surface of the housing 2. A rotary shaft 3 and a stopper rod 4 are provided on the housing 2 so as to be vertically parallel and movable in the axial direction. One end of the rotating shaft 3 has a receiving portion 6 to which one end of a torsion drive spring 5 is fixed at an inner end, and is rotatably provided on the housing 2 via a bearing 7. A central portion of the piece 8 is rotatably and axially movably supported. The other end is supported by a self-aligning ball bearing 9 and a pair of clutch portions, which will be described later, are normally provided outside thereof. A spring 10 for urging the pieces 19A and 19B in a direction away from each other, and a surrounding portion of the spring 10 and a pressing piece 11 of the ball bearing 9 are provided.

A handle member 13 provided with a lever 12 is vertically rotatably mounted on the outer end of the shaft piece 8, and a ratchet gear 14 is fixed inside the handle member 13 inside the handle member. The handle member 13 has a ratchet gear 14 when the handle member 13 is rotated clockwise.
During rotation in the counterclockwise direction, a ratchet pawl 15 released from the ratchet gear 14 diametrically faces the ratchet pawl 14 on the housing 2 side via the ratchet gear 14, When the handle member 13 rotates clockwise, the handle member 13 is released from the ratchet gear 14, and when the handle member 13 rotates counterclockwise, the ratchet claw 16 that meshes with the ratchet gear 14 and restrains the reverse rotation of the handle member 13 rotates. Each ratchet pawl 15, 16 is provided with a spring 17 for urging a spring force in a direction meshing with the ratchet gear 14.

The rotating shaft 3 has a guide sleeve 18 for guiding the torsion drive spring 5 and one of the releasable shafts 3 which is opposed to the receiving portion 6 and has the other end of the torsion drive spring 5 fixed thereto. A clutch piece 19A and another clutch piece 19B which is pivotally mounted on the rotating shaft 3 and has a connecting portion integrally provided on the outer surface are interposed between the shaft piece 8 and the washer 20. Further, a protruding end of the rotating shaft 3 protruding outward from the pressing piece 11 extends in a direction perpendicular to the protruding end, and a balance weight 22 and the weight 22 are attached to an adjusting screw portion 21 formed on one of the protruding ends. There is provided a centrifugal rotating body 26 in which a lock nut 23 for fixing is screwed, and a crucible 24 and a casting link 25 having a mold therein are arranged in a straight line on the other side. An auxiliary weight 27 is located above the middle part of 26. Locking hole 2 at the lower end inner surface thereunder
Protrusions 29 with 8 are provided respectively.

The stopper rod 4 penetrates the housing 2 and protrudes in the front-rear direction, and has a knob 30 at one end (front side) and a locking hole 28 at the other end. Locking portions 31 are provided.
The push spring 32 is provided in the housing 2 near the zero.
There are two parallel engaging grooves 34 and 35 which are engaged with the ball 33 which is constantly resilient, and in the vicinity of the engaging portion 31, the other clutch piece 19B is moved toward one clutch piece 19A. A clutch actuating mechanism 36 for pressing is provided. The clutch actuating mechanism 36 is composed of cracked pieces 41 bent in a V-shape, and an intermediate bent portion is pivotally attached 37 to a support provided in the housing 2 so as to be vertically rotatable.
A sliding groove 40 slidably engaged with a pin 39 protruding from the outer periphery of a ring 38 provided on the stopper rod 4 on its lower piece.
And the upper piece is rotatably connected to the connecting portion of the clutch piece 19B.

Reference numeral 42 denotes a stopper piece for preventing the ratchet pawl 14 from tilting, and 43 denotes an action piece 44 provided on the stopper rod 4 when the stopper rod 4 moves to the operating position.
A micro switch 46 for turning on one of the display portions 45A provided on the upper surface of the housing 2 when the torsion drive spring 5 is sufficiently wound to extend the entire length thereof. An operating mechanism 48 for operating a microswitch 47 for pressing the other display 45B provided on the upper surface of the housing 2 by being pressed, a finger 48 is provided at one end of an operating rod 49 provided in parallel with the centrifugal rotator 26. A hook 49 is provided at the other end with a pressing piece 51 for constantly pressing the crucible 24 by a spring 50.
5 is a press-contact mechanism for press-contacting and fixing to the centrifugal rotating body 26.

In use, as in the prior art, the casting ring 25 provided with a mold to be cast on the centrifugal rotating body 26 in a state in which the finger hook 49 of the press-contact mechanism 48 is pulled against the spring 50. After assembling, the traction of the finger hook 48 is released, and the casting ring 25 and the crucible 24 are pressed and fixed to the centrifugal rotating body 26 by the urging force of the spring 50, and then the balance weight 22 is moved in the axial direction. The balance is adjusted so that the centrifugal rotator 26 is horizontal. In a normal state, as shown in FIG. 3, the rotating shaft 3 in the figure is elastically urged leftward by the urging force of the spring 10, and a pair of clutch pieces 19
A and 19B are separated from each other, and the ball 33 is engaged with the front engagement groove 34, so that the stopper rod 4 is located at the second position.

When the stopper rod 4 is pressed forward from this state, the locking portion 31 at the tip thereof is locked in the locking hole 28 to restrict the rotation of the centrifugal rotator 26 and the ball 33
Engages with the rear engaging groove 35 to hold the stopper rod 4 at the first position, and the forward movement of the stopper rod 4 also causes the pin 39 provided on the stopper rod 4 to move forward. It slides in the sliding groove 38, thereby
Is rotated clockwise in the figure around the pivot point 37 to connect the clutch piece 19B with the crank piece 41,
It moves together with the rotating shaft 3 against the urging force of the spring 10 and is joined to the clutch piece 19A opposed thereto. In this state, the other end of the torsion drive spring 5 is fixed to the rotating shaft 3. Further, with the forward movement of the stopper rod 4, the action piece 44 acts on the micro switch 43 to turn on the display 45A, and the lighting of the display 45A causes the clutch pieces 19A and 19A to turn on.
It can be easily confirmed from the outside that B has meshed normally.

In this state, when the handle 12 is rotated counterclockwise in FIG.
One ratchet pawl 15 is released from the ratchet gear 14 and the other ratchet pawl 1 attached to the housing 2
6 is in a state of meshing with the ratchet gear 14.
Subsequently, when the handle member 13 is rotated clockwise in the figure,
This time, the ratchet pawl 15 meshes with the ratchet gear 14, which rotates clockwise integrally with the handle member 13, and the ratchet pawl 16 is released from the ratchet gear 14. By repeating the reciprocating rotation operation of the handle member 11 in this manner, the shaft piece 8 integral with the ratchet gear 14 rotates only clockwise in the drawing, and this rotation causes one end of the torsion drive spring 5 to rotate. Get caught and accumulate spring force.

The total length of the torsion drive spring 5 is extended by being caught, and the clutch piece 1
9A and 19B move leftward in the figure in the state of being pressed against each other, and this movement causes the operating mechanism 4 in contact with this.
6 also moves in the same direction and the micro switch 47 is operated, whereby the display portion 45B on the upper surface of the housing 1 is turned on. This lighting prevents the torsion drive spring 5 from being excessively caught and sufficient spring force. The storage state can be easily checked from the outside.

In the above, the clutch pieces 19A and 19B
Move together with the rotary shaft 3 in the left direction in the figure, the crank piece 41 rotates counterclockwise in the figure, and the stopper rod 4 moves in the right direction in the figure. The locked state with the stop hole 28 is still maintained. That is, the state shown in FIG. 4 is obtained.

When the metal in the crucible 24 is heated and melted in a state in which a sufficient spring force is accumulated in the torsion drive spring 5, the knob 30 is pulled forward from the state of FIG. Since the stopper 31 is released from the locking hole 28 and the centrifugal rotating body 26 is released, the rotating shaft 3 rotates at a high speed due to the spring force of the torsion drive spring 5 at that moment, and the centrifugal rotating body rotates centrifugally. As a result, the molten metal in the crucible 24 is injected into a mold in the casting ring 25 to perform, for example, casting of a crown.

On the other hand, with the disappearance of the spring force of the torsion drive spring 5 due to the high speed rotation of the rotary shaft 3, the entire length is shortened and returns to the original state, so that the clutch piece 19A separates from the clutch piece 19B, After the high-speed rotation, the rotating shaft 3 is restored together with the centrifugal rotating body 26 while spinning due to inertia.

[0018]

As described above, according to the present invention, since the torsion spring force can be accumulated in the torsion drive spring by the handle member without touching the centrifugal rotating body, the continuous casting operation can be easily performed. In addition, since the stopper rod and the clutch means for fixing one end of the torsion drive spring to the rotary shaft are interlocked by the clutch operating mechanism, operational stability can be obtained. , The handle operation and the knob operation can be performed at the front position, which is convenient for use. According to the configuration of claims 5 and 6, the engagement state of the clutch means and the adaptation state of the spring force of the torsion drive spring are improved. It has the advantages that it can be easily confirmed from the outside and a safe casting operation can be performed.

[Brief description of the drawings]

FIG. 1. Overall front view

FIG. 2 is an overall top view

FIG. 3 is a longitudinal sectional side view of an inoperative state.

FIG. 4 is a side view of an operating state in which a part is longitudinally cut;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base plate 2 Housing 3 Rotating shaft 4 Stopper rod 5 Torsion drive spring 6 Receiving part 8 Shaft piece 10 Spring 13 Handle 14 Ratchet gear 15, 16 Ratchet claw 19A, 19B Clutch piece 21 Screw part 22 Weight 24 Crucible 25 Casting Ring 26 Centrifugal rotator 28 Locking hole 30 Knob 31 Locking part 32 Press spring 33 Ball 34,35 Engagement groove 36 Clutch actuating mechanism 39 Pin 40 Sliding groove 41 Crank piece 43,47 Micro switch 45A, 45B Display part 46 Actuation mechanism

Claims (7)

(57) [Claims] 1. A dental centrifugal casting machine configured to rotate a rotating shaft by spring force accumulated in a torsion drive spring, and to centrifugally rotate a centrifugal rotating body having a casting ring and a crucible by the rotating shaft. A handle member is connected to one end of the torsion drive spring via a ratchet mechanism that co-rotates only in one direction, and the other end of the torsion drive spring can be connected to and separated from the other end in a joined state. A clutch rod comprising a pair of clutch pieces for fixing the ends to the rotating shaft is connected, and a stopper rod movable between a first position for restraining the centrifugal rotating body and a second position for releasing the restraint is provided. At the same time, the stopper rod and the clutch means are joined to each other at a first position of the stopper rod by joining a pair of clutch parts, and at a second position of the stopper rod, the pair of clutch parts are A dental centrifugal casting machine characterized by being connected by a clutch actuating mechanism for disengaging a joint. 2. A hollow housing erected on a base plate,
The rotating shaft and the stopper rod are arranged vertically parallel and movably in the axial direction, and a handle member is connected to one end of the upper rotating shaft via a ratchet mechanism. At the end, a centrifugal rotator and a spring for urging the pair of clutch pieces in the separating direction are attached, and a knob is attached to one end of the lower stopper rod facing the handle member, and a knob is attached to the other end. 2. The centrifugal dental casting machine according to claim 1, further comprising a locking portion that locks with a locking hole provided in the centrifugal rotating body when the stopper rod moves to the first position. 3. A ratchet mechanism is rotatably mounted on the housing, and rotatably and axially supports an end of a rotary shaft at a center portion, and has one end of a torsion drive spring at an inner end. The fixed receiving portion is provided on a shaft piece provided with a ratchet gear at an outer end thereof and a handle member rotatably mounted on the shaft piece, and the ratchet gear is provided only in one direction rotation of the handle member. A ratchet claw that meshes with the ratchet gear, which is provided on the housing and is released from the ratchet gear in one direction of rotation of the handle member, and meshes with the ratchet gear in another direction of rotation of the handle member to constrain its rotation. The dental centrifugal casting machine according to claim 2, comprising a nail. 4. A clutch actuating mechanism which is bent in the shape of a letter, and wherein the bent portion is formed of a crank piece pivotally mounted on a housing, and one of the clutch pieces is fixed to one of the clutch pieces which is fixed to a rotating shaft. The dental centrifugal casting according to claim 2 or 3, wherein the centrifugal dental casting is connected so as to be freely rotatable in the rotational direction, and the other piece is provided with a sliding groove for slidably engaging a pin provided on the stopper rod. Machine. 5. The dental centrifugal casting machine according to claim 1, further comprising a microswitch for turning on a display unit provided on a surface of the housing when the stopper rod moves to the first position. 6. A micro-switch for illuminating a display unit provided on a surface of a housing when the torsion drive spring has a sufficient spring force and is operated by extension of its full length. 4. The dental centrifugal casting machine according to 4, or 5. 7. A device according to claim 1, further comprising means for selectively restricting the first position and the second position of the stopper rod between the stopper rod and the housing. 6
The centrifugal dental casting machine as described.