JP3440171B2 - Paste extrusion equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paste extruding device for extruding a paste contained in a cartridge. For example, an apparatus for extruding a paste such as an industrial adhesive or a dental repair material.

[0002]

2. Description of the Related Art For example, when a predetermined amount of paste of two kinds of dental repair materials such as dental cement contained in two cartridges is required in a dental treatment, the paste is provided corresponding to each cartridge. The required plunger (extrusion rod) was pushed by hand to push out the necessary paste in a proper amount.

[0003]

However, the conventional apparatus has a problem that it is difficult to dispense a small amount of the paste because the plunger is manually pushed to adjust the dispensed amount of the paste by a proper amount.

In addition, after the paste is extruded, there is a case where the paste sags at the pouring outlet of the cartridge, that is, so-called "avalanche" may occur. Had a problem of adversely affecting.

An object of the present invention is to solve the above-mentioned problems and to provide a paste extruding device capable of facilitating the dispensing of a small amount of paste and preventing avalanche at the spout. .

[0006]

To achieve the above object, according to one aspect of the present invention, a feeder shaft having a screw portion and a first cam portion and rotating, and a screw portion of the feeder shaft are provided. A moving member that is screwed to move in the axial direction with the rotation of the feeder shaft and pushes out the paste contained in the cartridge by the pressing force of this movement, and an elastic body that applies an elastic force to the feeder shaft in the axial rearward direction. And engages with the first cam portion of the feeder shaft, and with a predetermined amount of rotation of the feeder shaft in a certain direction, comes into sliding contact with the first cam portion and makes the feeder shaft stand by against the elastic force. And a second cam portion that is once displaced from the position in the push-out direction of the paste and then returned to the standby position by the elastic force. According to the above configuration, by rotating the feeder shaft by a predetermined amount, the moving member that is screwed with the screw portion of the feeder shaft can be moved in the axial direction, and a desired amount of paste can be extruded even with a small amount, Also,
As the feeder shaft rotates by a predetermined amount, the first cam portion and the second cam portion
The cam movement of the cam part temporarily displaces the feeder shaft in the paste pushing direction, and after pouring, the feeder shaft is returned to the standby position by the elastic force, thereby making the inside of the cartridge negative pressure and avalanche of the pouring outlet of the cartridge. Can be prevented.

Further, preferably, a pressing rod provided on the cartridge is detachably connected to the moving member. Therefore, it is possible to easily attach and detach the cartridge.

Further, preferably, the two cartridges are mounted as one set, and the pressing rod provided in each cartridge is detachably connected to the moving member. Therefore, the two cartridges can be easily attached and detached.

Further, according to a preferred embodiment of the present invention, the moving member has two or more arc body portions each having a thread formed on an inner surface thereof, and a flexible connecting portion for connecting the arc body portions. The moving member is configured to be screwed into or removed from the threaded portion of the feeder shaft by approaching or separating the body parts. Therefore, the moving member can be easily screwed into or removed from the feeder shaft.

Further, according to a preferred embodiment of the present invention, the moving member connects the frame body, the two or more arc body portions mounted on the frame body, and provided with screws on the inner surface thereof, and the arc body portions. And a screw driving body formed of a flexible connecting portion, and the moving member is screwed or detached with respect to the screw portion of the feeder shaft by approaching and separating the arc body portions. . Therefore, the moving member having the frame can be easily screwed into or removed from the feeder shaft.

Further, preferably, the screw driving body is 2
It has two arc body parts and a single flexible connecting part that connects these one end parts to each other, and an opening is provided between the other end parts of both arc body parts. Therefore, the assembly of the moving member becomes easy.

Further, preferably, a connecting member connected to the pair of pressing rods of the cartridge is connected to the moving member. Therefore, the cartridge can be easily attached to and detached from the moving member.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a perspective view of a paste extrusion device according to an embodiment of the present invention. This device
It includes a case 2, a rotatable handle 20 attached to the rear end of the case 2, and a cap 6 that covers the front end of the case 2 during storage. The case 2 is divided into two parts, an upper case half 2a and a lower case half 2b, which are separated by a line L. In this example, two cartridges 8 are mounted in the case 2 as a set (dual cylinder). Have been typed). This device is used, for example, for the extrusion of pastes of dental repair materials such as dental cement. In this case, a paste A (containing a polymerization initiator) and a paste B (containing a polymerization accelerator) having different viscosities are housed in the cartridges 8, and the handle 20 is rotated to obtain equal amounts of the pastes A and B, which are mixed and cured.

The remaining amount of paste in the cartridge 8 is indicated by the indicator piece 5 (see FIG. 4). Further, the contact piece 7 of the cap 6 and the intrusion prevention piece 9 (see FIG. 2A) provided inside the upper portion of the front end of the case 2 prevent the cap 6 from being reversely attached. As a result, the paste that has adhered to the inside of the cap 6 does not mix and harden when the cap 6 is mounted reversely.

FIG. 2 shows the internal structure of the paste extruder. As shown in the vertical cross-sectional view of FIG. 2A, this extrusion device has the above cartridge 8 on the front side in the case 2.
A plunger 36 having a substantially X-shaped cross section, which is a pressing rod provided in each cartridge 8 and pushing out the paste accommodated in the cartridge 8 (see the cross-sectional view taken along the line DD in FIG. 2D).
It has and.

This extrusion apparatus is fixed to the case 2 and a feeder shaft 10 having a screw portion 12 and a first cam portion 14 and rotating on the rear side of the case 2 in FIG. 2A. , A second cam portion 18 that engages with the first cam portion 14 and makes a cam movement.
And a moving member 30 that is screwed into the threaded portion 12 of the feeder shaft 10 and moves in the axial direction. The plunger 36 of each cartridge 8 is detachably connected to the moving member 30 by a connecting member 22 described later.

FIG. 3 is a perspective view showing the structures of the feeder shaft 10 and the second cam portion 18. The feeder shaft 10 includes a bifurcated connecting portion 16 having a screw portion 12, a first cam portion 14, and a claw 15. The first cam portion 14 is
In this example, arc-shaped convex portions 14a and concave portions 14b are provided over each half of the sliding contact surface. Similarly to this, the second cam portion 18 has arcuate convex portions 18a and concave portions 18b over the respective 1/2 circles of the sliding contact surface,
It makes a cam motion by slidingly contacting the first cam portion 14.

The front end side of the feeder shaft 10 is rotatably and forward / backwardly supported by a protrusion 17 provided on the case 2, as shown in the sectional view taken along the line CC of FIG. That is,
The front end shaft portion 11 of the feeder shaft 10 is fitted in a through hole 17a provided in the protrusion 17 so as to be movable in the radial direction and the forward / backward direction.

As shown in FIG. 2B, the rear end side of the feeder shaft 10 is connected to the handle 20 through an elastic body 19 such as a coil spring. In this case, the bifurcated connecting portion 16 on the rear end side of the feeder shaft 10 in FIG.
(B) Enters into the tubular body 21 provided in the handle 20 and engages with the engaging ribs 26 located inside the tubular body 21 so as not to rotate relative to each other. Further, the claw 15 of FIG. 3 is fitted into a locking hole (not shown) of the cylindrical body 21 of FIG. 2B, and is locked to the handle 20 so as not to be relatively movable in the axial direction. Therefore, the feeder shaft 10 and the handle 20 are firmly connected without an adhesive. The elastic body 19 is provided on the outer side of the cylindrical body 21, and is pressed backward by the elastic force of the feeder shaft 10 and the handle 20 in a connected state.

The second cam portion 18 is fitted between a rib 28 extending in the width direction and a pair of left and right ribs 29 extending in the axial direction provided on the upper case half body 2a of FIG. It is pressed by the lower case half body 2b for vertical positioning.

The moving member 30 moves in the axial direction on the screw portion 12 of the feeder shaft 10. The moving member 30 is shown in FIG.
As shown in FIG. 1, from the clutch case 32, which is a frame, to the two or more arc body portions 34a mounted on the clutch case 32 and provided with screws on the inner surface, and the flexible joint portion 34b for coupling the arc body portions 34a. And a clutch nut 34, which is a screw driver configured. This moving member 30
The above-mentioned pointing piece 5 is integrally formed. This Figure 4
As shown in (a), between the clutch case 32 and the clutch nut 34, the plunger 3 which is the pressing rod of the cartridge 8 is inserted.
When the rear end shaft portion 36a having a circular cross section of 6 is mounted, the arcuate body portions 34a of the clutch nut 34 approach each other, and the screw 34c on the inner surface thereof and the screw portion 12 of the feeder shaft 10 are screwed together. On the other hand, as shown in FIG. 4B, when the plunger 36 is removed, the arcuate body portions 34a are separated from each other by the elastic return force of the flexible connecting portion 34b, and the moving member 30 is moved to the feeder shaft 10. Separate from the screw portion 12. In this embodiment, the other end portions 34 of both arc body portions 34a are
Although there is an opening between d, another flexible connecting portion for connecting the arcuate body portions 34a may be provided instead of this opening.

Plunger 36 of two cartridges 8
2B, as shown in FIG. 2B, are connected by a connecting member 22 (see the sectional view taken along the line EE in FIG. 2E), and in this state, they are connected to the moving member 30. The plunger 36 of the cartridge 8 can be easily attached and detached. That is, at the time of manufacturing, the cartridge 8 is fitted into the upper case half body 2a, and then the lower case half body 2b is covered. At this time, the two cartridges 8 can be easily loaded by fitting the connecting member 22 into the moving member 30.

Further, the moving member 30 moves on the guide rail 38 as shown in FIG.
Is prevented, and an equal amount of paste is poured between the two cartridges 8. As shown in the FF sectional view of FIG. 2 (f), each of the cartridges 8 is provided with a hooking piece 27 and engaged with each other, so that the cartridges 8 can be easily attached to and detached from the moving member 30. I am going to do it.

The operation of this device will be described below. Figure 5
The rotation state of the handle 20 and the moving state of the moving member 36 are shown in FIG. First, FIGS. 5A and 5D show a state before the paste is extruded. That is, the meshed convex portion 14 a of the first cam portion 14 and the concave portion 18 b of the second cam portion 18 are provided.
And the concave portion 14b of the first cam portion 14 and the convex portion 18a of the second cam portion 18 are engaged with each other, and the feeder shaft 10 is at the standby position. In this state, the handle 20 is pressed by the elastic body 19 and moves backward (to the right in the drawing), and a clearance S is formed between the handle 20 and the case 2.
0 is engaged with the handle 20 via the claw 15,
The first cam portion 1 is pulled rearward through the handle 20.
4 and the second cam portion 18 are pressed against each other by elastic force.

Next, as shown in FIG. 5B, the handle 20
Starts rotating in a fixed direction, the first cam portion 14 and the second cam portion 14
Since the cam portion 18 makes sliding contact with each other to perform the cam movement, the handle 2
With one rotation of 0, the feeder shaft also rotates once. As a result, the moving member 3 screwed onto the feeder shaft 10 shown in FIG.
0 moves forward by one rotation in the axial direction, and the moving member 30
Plunger 36 connected to pushes out the paste in each cartridge 8 by the pushing force of this movement. In this way, the rotational movement of the handle 20 is converted into the axial stroke movement of the screw shaft 12, and
A small amount of the desired paste is extruded at the pitch of rotation.

Further, in order to secure the amount of paste to be dispensed, a mark 24 is provided at the center of the handle 20 in FIG. 1 so that one rotation can be visually confirmed and the projection of the first cam portion 14 at the completion of one rotation. 14a and the concave portion 1 of the second cam portion 18
When 8b and 8b are engaged again, the convex portion 14a and the concave portion 14b collide with each other due to the elastic force of the elastic body 19 to make a snapping sound, which can be confirmed by hearing.

On the other hand, when the handle 20 starts rotating,
The convex portion 14a of the first cam portion 14 rides on the convex portion 18a of the second cam portion 18 of FIG. 5B, and the convex portion 14a of the first cam portion 14 resists the elastic force of the elastic body 19. And the feeder shaft 10 itself also protrudes forward by a distance H. That is, during the rotation operation of the handle 20, the feeder shaft 10 rotates once against the elastic force of the elastic body 19 while being displaced by the distance H from the standby position in the paste pushing direction. 5 (b), (e)
Shows a state in which the handle 20 is rotated 90 degrees, and FIG.
(C) and (f) show the state where the handle 20 is rotated 180 degrees. In each case, the feeder shaft 10 is displaced by a distance H from the standby position in the paste extrusion direction. After that, the handle 20 further rotates to 360 degrees, that is,
After one rotation, the feeder shaft 10 retracts together with the handle 20 due to the elastic force of the elastic body 19, and as shown in FIGS.
State, that is, the feeder shaft 10 returns to the standby position.

Therefore, after the paste is extruded, the plunger 36 connected to the feeder shaft 10 is returned by the distance H in the cartridge 8, so that the inside of the cartridge 8 becomes a negative pressure and a pulling force acts on the paste to cause the paste of the cartridge 8 to move. A state of dripping at the tip portion, that is, "parade" is prevented.

In this embodiment, the handle 20 is set to 1
The paste is pushed out by rotating, but as shown in FIG. 6, for example, the first cam portion 44 is diagonally arranged in the convex portion 44a of the 1/4 circle and the concave portion 44b of the 1/4 circle, Similarly, the second cam portion 48 is also diagonally arranged in the convex portion 48a of the 1/4 circle and the concave portion 48b of the 1/4 circle, and the paste is extruded by rotating the handle 20 by 1/2. Alternatively, the pitch between the convex portion and the concave portion in the same direction may be further reduced, and the protrusion may be rotated by 1 / n and pushed out.

Next, FIG. 7 shows a single cylinder type paste extruder according to another embodiment. As shown in the vertical and vertical sectional views of FIG. 7A and the horizontal sectional view of FIG. 7B, this device is provided with a setting member 52 at the rear end of the plunger 36. By fitting the clutch nuts 34 on both sides of the moving member 30 from below (see CC sectional view of FIG. 7C).
The moving member 30 and the screw portion 12 are screwed together, and the set member 52 is removed to separate them. In this device, as in the case of the first embodiment, a desired amount of paste is pushed out by the screw drive of the feeder shaft 10 by the rotating operation of the handle 20, and the cam motion of the first cam portion 14 and the second cam portion 18 causes Avalanche is prevented.

[0031]

According to the present invention, by rotating the feeder shaft by a predetermined amount, the moving member that engages with the screw portion of the feeder shaft is moved in the axial direction, so that a desired amount of paste can be pushed out even if it is a small amount. Also, with the rotation of the feeder shaft by a predetermined amount, the cam movement of the first cam portion and the second cam portion causes the feeder shaft to be temporarily displaced in the extrusion direction of the paste, and after pouring, the feeder shaft is elastically moved. By returning to the standby position, it is possible to prevent avalanche of the spout of the cartridge. This makes it possible to provide a paste extruding device that facilitates dispensing of a small amount of paste and prevents avalanche.

[Brief description of drawings]

FIG. 1 is a perspective view showing a paste extrusion apparatus according to an embodiment of the present invention.

2A is a vertical sectional view showing the paste extruding device, FIG. 2B is a horizontal sectional view thereof, and FIG. 2C is a sectional view taken along line CC.
(D) is a DD sectional view, (e) is an EE sectional view, and (f).
Is a FF sectional view, and (g) is a GG sectional view (c).

FIG. 3 is a perspective view showing a part of the paste extruder.

FIG. 4 is a cross-sectional view showing a moving member.

5 (a), (b) and (c) are longitudinal sectional views showing a cam movement of the paste extruding device, (d), (e),
(F) is a schematic diagram of each 1st cam part and 2nd cam part.

FIG. 6 is a configuration diagram showing a first cam portion and a second cam portion according to another embodiment.

7A is a vertical sectional view showing a paste extrusion apparatus according to another embodiment, FIG. 7B is a horizontal sectional view thereof, and FIG.
FIG.

[Explanation of symbols]

8 ... Cartridge, 10 ... Feeder shaft, 12 ... Screw part,
14 ... 1st cam part, 18 ... 2nd cam part, 30 ... Moving member, 32 ... Frame body (clutch case), 34 ... Arc body part, 36 ... Press rod (plunger).

Front Page Continuation (72) Inventor Jun Nakata 2-8 Oyodokita, Kita-ku, Osaka City, Osaka Prefecture Shin-Kobe Plastic Co., Ltd. (56) References JP-A-59-52 (JP, A) JP-A-63 −36868 (JP, A) Actually open 63-79912 (JP, U) Actually open 3-30924 (JP, U) Actually open 62-182782 (JP, U) (58) Fields investigated (Int.Cl . ⁷ , DB name) B65D 83/00 B05C 5/00 A61C 5/04

Claims (7)

(57) [Claims] 1. A feeder shaft which has a screw part and a first cam part and rotates, and a screw part which is screwed with the screw part of the feeder shaft to move in the axial direction with the rotation of the feeder shaft. A moving member that pushes out the paste contained in the cartridge forward by pressure, an elastic body that applies an elastic force to the feeder shaft in the axial rearward direction, engages with the first cam portion of the feeder shaft, and the feeder shaft After a predetermined amount of rotation in a certain direction, the feeder shaft slides against the elastic force to displace the feeder shaft from the standby position in the paste pushing direction, and then the elastic force causes the standby position to move. And a second cam portion for restoring the paste. 2. The paste extruding device according to claim 1, wherein the pressing rod provided on the cartridge is detachably connected to the moving member. 3. The paste according to claim 1, wherein two cartridges are mounted in a set, and a pressing rod provided in each cartridge is detachably connected to the moving member. Extruder. 4. The moving member according to any one of claims 1 to 3, wherein the moving member has two or more arc body portions having an inner surface formed with a screw and a flexible connecting portion connecting the arc body portions. A paste extruding device configured to screw a moving member into or out of a screw portion of a feeder shaft by approaching or separating arc-shaped portions. 5. The moving member according to claim 4,
A frame body; and a screw driving body that is attached to the frame body and is configured by two or more arc body portions in which screws are arranged on the inner surface and a flexible connecting portion that connects the arc body portions, A paste extruding device configured to screw a moving member into or out of a screw portion of a feeder shaft by approaching or separating arc-shaped portions. 6. The screw drive body according to claim 5, wherein the screw drive body has two arc body portions and a single flexible connecting portion that connects the one end portions of the two arc body portions to each other. A paste extrusion device with open spaces between parts. 7. The paste extruding device according to claim 1, wherein a connecting member connected to the pair of pressing rods of the cartridge is connected to the moving member.