JP5616129B2 - Cartridge type dispenser - Google Patents

Description

  The present invention relates to a cartridge-type dispenser suitable for dispensing a viscous material such as a filler used in dental practice and the like, and an inadvertent use of a piston used for extruding contents from a cartridge body. It is intended to prevent the piston from falling off and to achieve a smooth operation of the piston.

  In dentistry, etc., highly viscous paste-like materials such as fillers and adhesives are frequently used, and in order to dispense such materials, the cartridge body is filled with the material and at the rear end thereof. A dispenser has been used in which a piston is inserted and a separately prepared pushing jig is inserted into the cartridge body to push out the contents by pushing out the piston (see, for example, Patent Document 1).

  The cartridge-type dispenser is a type in which the contents filled in the cartridge body are used up in one treatment. In recent years, this type of dispenser has been widely used from the viewpoint of ensuring the quality of the filling material and hygiene. However, for example, when the diameter of the piston has become smaller than the inner diameter of the cartridge main body due to variations in molding accuracy, the internal pressure in the cartridge main body increases, or vibration or impact is applied to the cartridge main body. In some cases, the piston may fall out of the cartridge body. On the other hand, when the diameter of the piston is larger than the inner diameter of the cartridge body, the fitting force becomes too high, and the operation of pouring the contents becomes heavy, sometimes causing a malfunction. There was a problem that the contents could not be poured out smoothly.

JP 2001-57987 A

  An object of the present invention is to propose a cartridge-type dispenser suitable for dispensing viscous materials that can dispense the contents under the smooth operation of the piston without causing the piston to fall off.

The present invention is a cartridge body having a filling space for contents and having a dispensing nozzle at the tip thereof, and is slidably disposed in the filling space of the cartridge body. A cartridge-type dispenser comprising a piston for pushing out the contents from the tip of the dispensing nozzle,
The piston comprises a slider that directly presses the contents in the filling space, and an annular base portion that is detachably connected to the rear end of the slider.
The outer peripheral wall of the base portion is fitted to the inner peripheral wall of the entry end of said cartridge body,
Front portion of the base portion, the outer peripheral wall of the site, together with a diameter increasing toward the rear, the enlarged diameter portion whose diameter increases toward the rear provided on the inner peripheral wall of the entry end of the cartridge body it is abutting a cartridge dispenser, characterized in that.

As the slider constituting the piston, one having an open groove on the front end surface and having an annular groove portion that elastically deforms the outer peripheral wall of the slider in the radial direction to enhance the close contact with the inner peripheral wall of the cartridge body is advantageous. Fits. The nozzle cap further includes a nozzle cap that is attached to the pouring nozzle, and the nozzle cap includes a cap main body into which the pouring nozzle is inserted and a bottom wall that forms a knob portion at a tip portion of the cap main body. A gap is formed between the cap main body and the pouring nozzle, and an inner surface of the bottom wall has a cross-shaped protrusion that enters an opening portion of the pouring nozzle, and a base end of the protrusion It is preferable that at least one groove portion that is formed in the gap and communicates with the gap is provided.

  The piston is composed of two parts, a slider and a base part, and the base part is fitted to the inlet end of the cartridge body to close it, so that the internal pressure rises and vibration and impact are added. Even if there is, the piston will not fall off easily.

  Since the slider can be easily separated from the base portion, the contents can be reliably poured out. In particular, even if the diameter of the barrel at the tip of the slider is slightly larger than the inner diameter of the cartridge body, the outer circumferential wall of the barrel is easily elastically deformed in the radial direction by the annular groove, so that the operation becomes heavy. Adhesion can be improved without any improvement (sealing performance is improved).

It is the figure which showed embodiment of the cartridge type dispenser according to this invention in the cross section. It is the figure which showed the use condition of the dispenser shown in FIG.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a cross-sectional view showing the overall configuration of a dispenser according to the present invention, and FIG. 2 is a view showing a use state of the dispenser shown in FIG.

  In the figure, reference numeral 1 denotes a cartridge body that forms a filling space M for contents. A discharge nozzle 1 a is integrally provided at the tip of the cartridge body 1, and an outer peripheral wall of the entry side end 1 b of the cartridge body 1 is linked to a separately prepared extrusion tool (not shown). A flange portion 1c is provided.

  Reference numeral 2 denotes a piston disposed inside the cartridge body 1. The piston 2 includes a cylindrical slider 2a that directly presses the contents in the filling space M, and an annular base portion (plug) 2c that is connected to the rear end of the slider 2a via a connecting piece 2b. . The connecting piece 2b is composed of a plurality of plate-like pieces provided at intervals around the slider 2a, and can be torn off by pressing only the slider 2a toward the dispensing nozzle 1a. ing.

The base portion 2c is provided on the outer peripheral wall thereof with a convex portion that can be fitted to the inner peripheral wall of the cartridge main body 1 by means such as undercut (engagement with screws), and is once fitted. If it does, it cannot be removed easily. Further, the slider 2a has an outer diameter of the front portion (about 1/3 of the entire length) slightly larger than the inner diameter of the cartridge main body 1 (imaginary line in FIGS. 1 and 2). A lateral annular groove 2d having an open end on the tip surface and having a depth of about 1/3 of the total length of the slider 2a is formed. Further, the rear portion of the slider 2a connected to the front portion of the base portion 2c is formed with a narrow diameter with the end portion being left to form a very small gap with the inner peripheral surface of the cartridge body 1. I can keep it.

Reference numeral 3 denotes a nozzle cap that is attached to the dispensing nozzle 1a and closes the dispensing opening of the dispensing nozzle 1a. The nozzle cap 3 includes a cap body 3a into which the dispensing nozzle 1a is inserted, and a bottom wall 3b that forms a knob portion (flange portion) at the distal end portion of the cap body 3a. A gap 3c is formed between 3a and the dispensing nozzle 1a. At the center of the bottom wall 3b, there is provided a cross-shaped protrusion 3d that enters the opening of the dispensing nozzle 1a. When the internal pressure in the cartridge body 1 rises, the cross-shaped protrusion 3d. The internal pressure escapes to the outside through at least one groove 3b ₁ formed at the base end (the inner surface of the bottom wall 3b) and the gap 3c.

  The nozzle cap 3 may be attached to the dispensing nozzle 1a by an engagement means such as undercut, or may be engaged by a screw, and the internal pressure in the cartridge body 1 is increased. In this case, the structure is not particularly limited as long as the structure does not easily come off. It should be noted that the tip of the dispensing nozzle 1a may be configured to be sealed with a sealing member or the like instead of the nozzle cap 3.

  When a fitting effect is imparted to the nozzle cap 3, it is preferable that the nozzle cap 3 is difficult to deform. It is also possible to apply the nozzle cap 3 that is easily deformed. In this case, there is an advantage that the nozzle cap 3 can be mounted even if the dimensions are not strictly set.

  The dispenser having the above-described configuration is easy because the outer surface of the body portion of the slider 2a is slightly larger than the inner diameter of the cartridge body 1 to improve the adhesion, because the annular groove 2d is formed on the tip surface thereof. The slider 2a of the piston 2 can be smoothly slid by forming a very small gap between the outer peripheral surface of the rear portion and the inner peripheral surface of the cartridge body 1. it can.

  In the cartridge-type dispenser having such a configuration, the pushing piece is inserted through the through hole of the base portion 2c, and the slider 2a is pushed toward the dispensing nozzle 1a by the pushing tool, whereby the connecting piece 2b is torn off and the slider 2a As a result, the contents are pushed out from the pouring nozzle 1a.

  The contents applied to the cartridge-type dispenser according to the present invention can be filled with a wide range of viscous materials ranging from high viscosity to low viscosity, and is not limited in this respect.

  It is possible to provide a cartridge-type dispenser that is suitable for dispensing a viscous material that can dispense the contents under the smooth operation of the piston without causing the piston to easily fall off from the main body.

DESCRIPTION OF SYMBOLS 1 Cartridge body 1a Outlet nozzle 1b Inlet side end 2 Piston 2a Slider 2b Connection piece 2c Base part 2d Annular groove 3 Nozzle cap 3a Cap body 3b Bottom wall 3c Rib 3d Projection

Claims (3)

A cartridge body having a filling space for contents and having a dispensing nozzle at the tip of the cartridge body and slidably disposed in the filling space of the cartridge body, and the contents in the filling space are poured by applying a pushing force. A cartridge-type dispenser having a piston pushed out from the tip of the outlet nozzle,
The piston comprises a slider that directly presses the contents in the filling space, and an annular base portion that is detachably connected to the rear end of the slider.
The outer peripheral wall of the base portion is fitted to the inner peripheral wall of the entry end of said cartridge body,
Front portion of the base portion, the outer peripheral wall of the site, together with a diameter increasing toward the rear, the enlarged diameter portion whose diameter increases toward the rear provided on the inner peripheral wall of the entry end of the cartridge body It is abutting, cartridge dispensers, characterized in that.   2. The cartridge type according to claim 1, wherein the slider has an annular groove portion that has an open end on a front end surface thereof and elastically deforms the outer peripheral wall of the slider in the radial direction so as to improve adhesion to the inner peripheral wall of the cartridge body. dispenser. A nozzle cap attached to the dispensing nozzle;
The nozzle cap is composed of a cap body into which the dispensing nozzle is inserted, and a bottom wall that forms a knob portion at the tip of the cap body,
A gap is formed between the cap body and the dispensing nozzle,
The inner surface of the bottom wall is provided with a cross-shaped projection that enters the opening portion of the dispensing nozzle and at least one groove portion that is formed at a base end of the projection and communicates with the gap. Item 3. A cartridge-type dispenser according to Item 1 or 2.

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