JPS61276550A - Apparatus and method for extruding pasty material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an extrusion device, in particular an extrusion device for relatively viscous pasty materials, such as dental filling materials, and for extruding this pasty material. Concerning the method of failure.

Conventional technology ′.

Manually operated syringe-shaped extrusion devices are well known. Such extrusion devices generally consist of a cylindrical tube terminating in a nozzle at one end and closed at the other end by a removable cover member.
A piston rod extends through the cover member for operating a piston located within the cylindrical tube. The piston is capable of sliding while forming a good seal on the inner peripheral surface of the cylindrical tube. Manually operable extrusion devices of this type are difficult to operate when the material being extruded is a relatively sticky material. In such cases, in order to operate the extrusion device satisfactorily, the operator must hold the cylindrical tube of the extrusion device with one hand in order to apply sufficient force to the cannon with the other hand. A□ru.

These problems have been solved to some extent by threading the piston rod and the cylindrical tube or closure member so that the piston is threaded into the cylindrical tube and forces the material out of the nozzle. It was done. Such an extrusion device is capable of extruding relatively viscous materials by reducing the force required to be applied to the piston by simple means of threading the piston. However, even such extrusion devices require the operator to use both hands. The same is true for extrusion equipment for extruding viscous pasty materials, except that any viscous pasty material continues to exit the nozzle even after the operator has stopped operating the extrusion equipment. Tend.

Such a post-compression phenomenon is generally known as a post-compression expansion phenomenon, and is a difficult problem, especially when waste of extruded materials is to be avoided in consideration of cost. Moreover, if the extruded material is for therapeutic use, for example, a dental optical material, the material will harden after being extruded from the extrusion device, and the above-mentioned expansion phenomenon after compression will lead to serious difficulties in the extrusion device. becomes inoperable.

It is known that the expansion phenomenon after compression can be solved by an extrusion device in which the piston rod P returns to its starting position each time the handle is released or the pawl is released. However, there are disadvantages when the extruded material is fed more or less continuously. When are you trying to supply a lot of materials?
However, it is necessary to move the piston rod over the entire length of the emptied portion of the tube containing the material.

An extrusion device that attempts to solve these drawbacks includes, for example, a type that gives a predetermined return motion to the plunger, but this extrusion device requires a complicated mechanism (for example, as disclosed in the U.S. patent 2,815,151) or a spring mechanism requiring precise relative extension of the springs for sufficient operation (see GB 1,520,762).

Problems to be Solved by the Invention Therefore, there is a need for an extrusion device that reduces the above-mentioned drawbacks.This extrusion device has a simple structure with relatively few moving parts, and is relatively inexpensive. It must be manufactured. Furthermore, at least the housing of the device must be constructed in such a way that it can be manufactured not only from metal, but also from synthetic resin, for example by injection molding. The object of the invention is to provide such a device.

7. Means for Solving the Problems According to one means of the apparatus of the present invention that solves the above problems, there is provided an extrusion apparatus for supplying an unspecified amount of paste-like material, the housing having a handle portion. and a housing coupling part for coupling the housing to a cartridge containing a paste-like material, and a nozzle is provided at one end of the cartridge, and a nozzle is provided at one end of the cartridge, and the paste-like material in the cartridge is A reciprocating piston rod and piston member are provided for compressing and ejecting the pasty material from the nozzle, and for advancing the piston rod in a direction to extrude the pasty material when the cartridge is connected to the housing. an operating lever is pivotably provided and a clutch is provided for preventing the return of the piston member P beyond a distance sufficient to compensate for the expansion after compression of the pasty material; is adapted to prevent a backward movement of said piston rod by engaging said piston rod at a predetermined angle in its rest position, and said operating lever and/or clutch is configured such that said operating lever and/or clutch is configured such that said operating lever and/or clutch is configured to prevent a backward movement of said piston rod by engaging said piston rod at a predetermined angle in its rest position; The clutches cooperate with each other to disengage the piston rod, thereby compensating for the post-compression expansion that occurs in the pasty material at the end of the extrusion stroke of the pasty material. The piston is caused to move back by a distance sufficient to

In order to return the piston to an extent sufficient to compensate for the expansion forces after compression, the operating lever is advantageously provided with means for disengaging the clutch from the engagement of the piston rod when the operating lever is fully operated. .

The shape and dimensions of the operating lever are such that a first section of the operating lever acts to move the piston rod forward;
A second section is configured to cooperate with the clutch. The actuating lever preferably has an approximately Y-shaped configuration.

According to an advantageous embodiment of the invention, the actuating lever causes a forward movement of the piston rod via the thrust plate. When the operating lever is operated, the thrust plate tilts and engages the piston rod, thereby causing the piston member to move forward. A damping element is advantageously provided between the actuating lever and the thrust plate in order to ensure a smooth movement between the lever and the plate. The buffer member is, for example, a freely rotating roller provided on the operating lever. The thrust plate is loaded away from the housing connection, for example by a return spring. The thrust plate preferably has an approximately diamond-shaped opening through which a piston rod P, preferably with a hexagonal cross section, extends. It has been found to be particularly advantageous to pass a piston rod with a hexagonal cross section through an approximately diamond-shaped opening. This is because when the thrust plate causes the piston rod to move forward, the load between the thrust plate and the piston rod is spread beyond their line of contact, so that wear on the piston rod and around the aperture is minimized.

The clutch preferably has the shape of a clutch plate and, as described with respect to the thrust plate, advantageously has a generally diamond-shaped opening through which the piston rod extends. There is. By passing the hexagonal cross-section piston rod through an opening in the clutch plate with a substantially diamond-shaped cross-section, wear around the opening in the clutch plate can be reduced.

As long as the thrust plate and clutch plate can engage the piston rod, the piston rod need not necessarily have a hexagonal cross section, and the openings provided in the thrust plate and clutch plate need not be substantially rhomboidal. Therefore, for example, the piston groove Y may have a diagonal line extending in the vertical direction and be formed in a rectangular cross-sectional shape corresponding to the openings of the thrust plate and the clutch plate.

Generally, however, wear is reduced by distributing the frictional force applied to the piston rod by the thrust plate and clutch plate over as large a surface of the piston rod as possible. It would be particularly advantageous if the extrusion device could be manufactured from synthetic resin material. The cross-sectional shape of the piston rod V may have 5.6 or 7 sides or more.

The actuating lever is advantageously designed to come into contact with the clutch in use; for this purpose the actuating lever is provided with a rim. However, it is advantageous to interpose an adjustable stop between the operating lever and the clutch. In this respect, the actuating lever preferably has an adjustment stop. This adjustment stopper has the shape of a screw screwed into a screw hole of the operating lever, and can be adjusted so as to protrude from the operating lever and come into contact with the clutch plate during use. The screw may, for example, extend out of the housing of the device and be easily adjustable, or the screw may remain within the housing and be adjustable, for example, with a screwdriver through an appropriately disposed opening in the housing. The actuating lever is loaded into the non-actuating position, for example by a spring.

The clutch plate is loaded, for example, by a return spring in the direction away from the Hawthong connection.

The clutch plate is specially configured to form a connection between the operating lever and the clutch, if desired via an adjustment stop, so that when the operating lever is actuated, the adjustment stop moves the clutch plate into the piston rod. release from engagement with.

As a result, for example, the clutch plate is in clutch position (1) and
It is inclined to form a rest clutch position (11) cooperating with the operating lever. However, no adjustment of the clutch plates is necessary. This is because the lever is provided with a rim 6 and, if necessary, an adjustment stop so that actuation of the operating lever disengages it from engagement with the clutch plate or piston rod. This is because they can be adjusted.

It is therefore clear that the clutch plate or the operating lever, or both, may be adjusted, if desired, such that actuation of the operating lever disengages the clutch plate from the engagement of the piston rod.

The cartridge containing the pasty material is removably connected to the extruder housing so that the cartridge is removed after use. The cartridge is coupled to the snap-fit housing. A bayonet or Luer lock connection consists of a barb retainer on the housing of the extrusion device and a corresponding collar on the cartridge that engages the barb retainer, or on the housing of the connection. It consists of a threaded hole provided therein and a cartridge having a corresponding thread that is screwed into the threaded hole.

If the dental filling material is variable, the cartridge is preferably made of an impermeable material with an impermeable pigment, such as carbon or black.

The extrusion device according to the invention advantageously has additional means for disengaging the clutch plate from the piston rod to allow a retraction movement of the piston rod.

This means advantageously consists of a spring-loaded bushing rod which is manually operated to disengage the clutch. For example, one end of the bushing rod extends out of the housing of the pusher, so that when one end of the bushing rod is pushed with the thumb, the other end of the bushing rod disengages the clutch plate from the piston rod.

For example, if an operating lever is provided, actuate the operating lever to advance the thrust plate, disengage the clutch from the piston rod, and push the piston rod back into the housing of the ejector, thereby releasing the cartridge. You can also pull it in after removing it.

The handle part of the device according to the invention, the tab D), is, if desired, configured such that a complete actuation of the handle causes the operating lever to pivot by different degrees about its pivot point. This allows the operator of the extrusion device to vary the amount of pasty material extruded from the extrusion device even after fully manipulating the handle. This is done in different ways. For example, the extrusion device has a handle with an adjustable protrusion for contacting an operating lever, the handle being pivotably arranged such that by operating the handle, the operating lever is moved to its pivot point. It is made to rotate around the center.

The position of the protrusion on the handle is adjustable so that the protrusion is brought into contact with the operating lever at different points along its length and moves the operating lever at different distances about its pivot point. be able to. For example, the handle may have a stationary protrusion, but the handle may be removed in order to be able to move the operating lever at different intervals around its pivot point. It is also possible to replace it with another handle, each with a protrusion fixed in a different position.

Such adjustability is particularly advantageous if the extrusion device supplies different materials from different cartridges.

According to the means of the method and method of the present invention that solves the above problems, when the cartridge is connected to the extrusion device and the operating lever is operated to extrude the paste material from the nozzle of the cartridge, the extrusion The clutch of the device is moved sufficiently to disengage the piston rod, thereby compensating for expansion of the pasty material after compression.

The device according to the invention is advantageously used for supplying dental filling materials. When dispensing dental filling material, the dental filler material is supplied from the extrusion device of the present invention to a pad which is then filled into the cavity of the patient's tooth using, for example, a spatula; According to the method, the extrusion device of the present invention is used to fill a dental cavity with a dental filling material.

If it is desired to directly deliver dental filling material from a device according to the invention into a tooth cavity, the device according to the invention includes a suitably shaped disposable nozzle for attachment to a cartridge attached to the device. is provided. The nozzles are advantageously disposable to avoid contamination from patient-to-patient contact.

Also according to the invention there is provided a kit comprising an extrusion device of the invention and at least one cartridge of dental filling material. If the dental filling material is variable, the cartridge may consist of an impermeable material, for example preferably with an impermeable pigment, such as carbon black. A kit comprising a device according to the invention and at least one cartridge of dental filling material optionally comprises an oxidized etching solution or gel, preferably a colored oxidized etching solution. Colored dels allow dentists to identify dels on teeth. The kit optionally also includes a mediating resin in the form of an adhesive or dentin adhesive for use on the pericavitary enamel of the tooth. The kit may include one or more brushes for etching and/or adhesives.

Embodiments and Operations Next, the structure and operations of the present invention will be specifically explained with reference to the embodiments shown in the drawings.

A preferred extrusion device according to an embodiment of the invention, shown in FIG. 1, consists of a housing 1 and a cartridge 2 containing pasty material, which is connected to the housing by a screw connection. The housing 1 cooperates with the operating mechanism of the extrusion device. Since the housing 1 is in the shape of a handgun, the user can easily hold it and operate it with one hand.

The three-trimmed handle portion is fixed to the housing 1 so as to be pivotable about a pin 4. The part of the trigger 3 that is present in the housing 1 is provided with a projection 5 that contacts an operating lever 6 that pivots about a pin 7 . The pin 7 is fixed within the housing 1. The operating lever 6 has two upper limbs 9,10.

The rim 9 is provided with a freely rotating roller 11 at its top, which rotates around a pin 12 of the operating lever 9 and comes into contact with a thrust plate 13. The rim 10 of the operating lever 6 is provided with a threaded hole 14 into which a screw 15 is screwed. One end of the screw 15 projects beyond the rim 10 and abuts the clutch plate 16, acting as an adjustable stop.

The position of the screw 15 in the upper rim 10 of the operating lever 6 is adjusted via a gap 26 provided in the housing 1 to access the screw 15. One end of the piston rod 17, which has a hexagonal cross-section, ends in a piston 18, which in use penetrates into the cartridge 2 and forces pasty material out of the nozzle 19 of the cartridge 2. put out. The piston rod 17 is
It is slidable through a support member 22 molded within the housing 1 . The thrust plate 13 is the piston rod 1
The thrust plate 13 is rotatably mounted about the center point 7 and has a substantially diamond-shaped opening.

Through this diamond-shaped opening passes a piston rod 17 with a hexagonal cross section, as shown in FIG.

The substantially rhombus-shaped opening formed in the thrust plate 13 has a side surface forming the maximum angle of the rhombus that is connected to the piston rod 1.
It is arranged and designed so that it contacts four of the hexagonal surfaces of 7. The thrust plate 13 is urged by a return spring 21 into a substantially vertical rest position and rests against two support members 22 extending downwardly from the housing 1 and against the freely rotating roller 11. The freely rotating roller 11 is rotatable around a pin 12 provided on the operating lever 6. When the thrust plate 13 is in the rest position, the piston rod 17 is not pushed by the thrust plate 13 and therefore does not perform any moving movement. The clutch plate 16 is also rotatably mounted around the piston rod 17, and a substantially diamond-shaped opening is formed in the center of the clutch plate 16. A piston rod 17 with a cross section passes through it in the same manner as described for the thrust plate 13. Housing 1
The protrusion 23 extending downward from the clutch plate 16 has a support portion for supporting the clutch plate 16. The clutch plate 16 is loaded by a return spring 24 and is forced into the tilted position shown in FIG. 1 and into the rest position.

In this position, the clutch plate 16 clamps or grips the piston rod 17, so the backward movement of the piston rod 17 (
The movement of the piston rod 17 away from the member for coupling the cartridge 2 to the housing 1) is prevented. However, the piston rod 17 is not prevented from moving forward when the clutch plate 16 is in its rest position (movement in the direction of the pawl, the member for connecting the cartridge 2 to the housing 1). The housing 1 further includes an inner housing 28.
A spring-loaded release rod 27 is provided which rests on and rests on. Since one end of the release rod 27 extends outside the housing 1, it can be operated manually, and the other end of the release rod 27 extends outside the housing 1.
6 and tilt it to release the engagement with the piston rod 17.

When operating, when the handle 3 is turned around the pin 4, the protrusion 5 moves into the operating lever 6.
swivel around pin 7. As the operating lever 6 pivots around the pin 7, the row 211 moves the thrust plate 13 around the piston rod 17.
, the thrust plate 13 clamps or grips the piston rod 17. When the trigger 3 is further pulled, the operating lever 6 further pivots around the pin 7, and the roller 11 moves between the thrust plate 13 and the piston rod 1.
7 is pushed further forward, thereby forcing the piston into the cartridge 2 and compressing the pasty material within the cartridge 2, which in turn is forced out of the nozzle of the cartridge 19. When the operating lever 6 is pivoted about the pin 7 by pulling the lever 3, the screw 15 provided in the upper rim 10 of the operating lever 6 is brought into contact with the lower part of the clutch plate 16. When the trigger 3 is pulled further and the operating lever further rotates around the pink, the screw 15 engages the clutch plate 16.
Since the clutch plate 16 is tilted, the piston rod (F) is tilted.
17, so that the clutch plate 16 is disengaged from the piston rod 17, and since the piston rod 17 is not supported by the clutch plate 16, the backward movement (described above) is free. It will be held in

When the trigger 3 is returned to its rest position, the operating lever 6 is pivoted back to its rest position via the thrust plate 13 and the roller 11 by the spring action of the spring 21. In this way, the roller 11 and thrust plate 13 move rearward. When the lever 3 is fully pulled, the clutch plate 16 is released from clamping or gripping engagement with the piston rod 17 as described above. Therefore, when the bird 3 is released slowly, the piston rod 17 is first released for performing a backward movement. That is screw 15.
This is because the upper part of the clutch plate 16 is maintained in a substantially vertical position due to the abutment between the piston rod 17 and the clutch plate 16, thereby preventing the piston rod 17 and the clutch plate 16 from being clamped or gripped together.

This prevents a backward movement of the piston rod 17 that would otherwise occur. Therefore, even if the screw 15 moves backward in response to the release of the lever 3, the backward movement of the lower part of the clutch plate 16 that occurs at this time will at least initially cause the piston rod 17 and the clutch plate 16 to The connection between the piston rod 17 and the piston rod 17
is moved backwards to compensate for the expansion forces after the compressive forces that occur in the pasty material. Therefore, while driving,
The piston rod 17 moves backward due to the expansion force generated in the paste material due to the reaction of the compressive force and due to the frictional engagement between the piston rod v17 and the thrust plate 13. However, when Toriga 3 is further released,
Under the action of the return spring 24, the clutch plate 16 is pivoted from its substantially vertically extending position toward the protrusion 23, thereby causing the screw 15 to move further rearward. As a result, the clutch grate 16 and the piston rod 17 are brought into a pinching or gripping engagement, and further rearward movement of the piston rod 17 is prevented. When the bird 3 is completely released, the screw 15 leaves contact with the lower part of the clutch plate 16,
This returns the clutch plate 16 to its rest position.

When the cartridge of pasty material is empty, the clutch plate 16 is disengaged from the piston rod 17 by pressing the release rod 27, and the used cartridge is removed and the piston rod 17 returns to its starting position within the housing 1. will be returned to. The piston rod 17 is then returned into the housing by pushing the piston 18. A new cartridge is then inserted in place of the used cartridge. If desired, the piston rod 17 can also be replaced with a new piston rod in the manner described above.

The screw 15 also acts as an adjustable stop as described above. This is because the distance by which the screw 15 projects beyond the upper rim 10 can be varied by simply inserting a screwdriver into the gap 26 of the housing, engaging the head of the screw 15, and turning the screw appropriately. be. The greater the distance that the screws protrude beyond the upper rim 10, the more the clutch plate 1
6 is disengaged from the piston rod 17, and therefore the time for compensating the expansion forces after the compressive forces occurring in the pasty material is longer.

This extrusion device is thus able to cut off the pasty material sharply by operating the trigger 3 of the extrusion device, while the piston rod is prevented from returning completely to its starting position. The extrusion device according to the invention reduces the problem of post-compression expansion effects, which, as known in the art, cause pasty material to be extruded from the extrusion device even after the trigger has been returned to its rest position.

In an advantageous embodiment of the invention, an adjustable stop is additionally provided, so that the operator of the extrusion device can adjust the time for disengaging the clutch plate from the piston rod and thus operate if desired. The operator can adjust the screw 15 depending on the material used and the expansion force after compression based on this material.

Effects As described above, according to the extrusion device of the present invention, it is possible to easily compensate for the expansion phenomenon after compression when extruding a paste-like material, and therefore the paste-like material can be sharply cut off at the end of the extrusion operation. I can do it. Furthermore, the extrusion device according to the present invention has a simple structure with relatively few moving parts and can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 shows FIG. 2 A- of a syringe according to an embodiment of the present invention.
A sectional view taken along line A, and FIG. 2 is a view seen from direction B in FIG. 1. 1...Housing, 2...Cartridge, 3...
Trigger, 4...Gin, 5...Protrusion, 6...Operation lever, 7...Bin, 9.10...Rim, 11...
・Roller, 12...Gin, 13...Thrust plate, 14...Screw hole, 15...Screw, 16...Clutch plate, 17...-One-stone rod, 18...Piston , 19... nozzle, 21... return spring, 22...
...Support member, 23...Protrusion, 24...Return spring, 26...Gap, 27...Release rod, 2
8... Internal housing procedure amendment (method) June 2Φ, 1986

Claims (1)

[Claims] 1. In an extrusion device for supplying an unspecified amount of paste material, a housing (
1) and a housing coupling part for coupling the housing (1) and a cartridge (2) containing a paste-like material, and a nozzle (19) at one end of the cartridge (2). is provided with a reciprocating piston rod (17) and a piston member (18) for compressing the pasty material in the cartridge (2) and forcing it out of the nozzle (19); An operating lever (6) is rotatably provided for advancing the piston rod (17) in the direction of extruding the pasty material when the cartridge (2) is connected to the housing (1). Piston rods (with spacing larger than sufficient to compensate for expansion after compression)
A clutch (16) is provided for preventing the return of the piston rod (17) by engaging the piston rod (17) at a predetermined angle in its rest position. The operating lever (6) and/or the clutch (16) are adapted to prevent backward movement of the operating lever (6) and/or the clutch (16) when the operating lever (6) is fully actuated.
) cooperate with each other to disengage the piston rod (17), thereby compensating for the post-compression expansion that occurs in the pasty material at the end of the extrusion stroke of the pasty material. An extrusion device characterized in that the piston is caused to move backward by a distance sufficient to 2. The shape and dimensions of the operating lever (6) are such that the first section of this operating lever (6) acts for the forward movement of the piston rod (17) and the second section acts for the forward movement of the piston rod (17).
2. An extrusion device as claimed in claim 1, wherein the extrusion device is configured to cooperate with: 3. The extrusion device according to claim 2, wherein the operating lever (6) has a substantially Y-shape. 4. An additional member is provided for disengaging the clutch (16) from the engagement of the piston rod (17) and thereby causing a return movement of the piston rod (17);
An extrusion device according to any one of claims 1 to 3. 5. A method for extruding a pasty material, comprising: a housing (1) having a handle (3); and a cartridge (2) containing the pasty material; A nozzle (19) is provided at one end of the cartridge (2) for compressing the pasty material in the cartridge (2) to
) for extrusion from a reciprocating piston rod (1
7) and a piston member (18), an operating lever (6) for advancing the piston rod (17) in the direction of extruding the pasty material when the cartridge (2) is connected to the housing (1). ) is pivotably mounted and a clutch (16) is provided for preventing the piston rod (17) from returning beyond a distance sufficient to compensate for the expansion of the pasty material due to compression. In the extrusion device using an extrusion device, the cartridge (2) is connected to the extrusion device, and the operating lever (6) is operated to expel the paste material from the nozzle (19) of the cartridge (2). During extrusion, the clutch (16) of the extrusion device is moved by a sufficient amount to disengage the piston rod (17), thereby:
A method for extruding a pasty material, characterized in that it compensates for the expansion after compression of the pasty material. 6. The method according to claim 5, wherein a dental filling material is placed in a cartridge (2) connected to the extrusion device.