JPH02144168A - Dispenser for viscous material - Google Patents

Abstract

PURPOSE: To obtain a dispenser for viscous material which facilitates the loading of the conventional cartridge and has the reliability of operation by constituting the dispenser in such a manner that, when piston heads are forced into the cartridge by suitably setting an energizing device, the head part of a rod advances along the recesses of an 8-shaped part to make display of dispensing done or the amt. of the remaining material and a keep rotates clockwise to a cocked position. CONSTITUTION: When a trigger is pulled, since air from a supply section connected to a screwing inlet port 50 acts on the surface of pistons 14 and draws the piston heads 17 out of a front surface wall 18 and presses the heads to the cartridge piston, the piston heads extending into the respective holes press the cartridge pistons. The material is then extruded from the nozzle 44.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dispenser for dispensing viscous materials such as thick liquids or pastes.

BACKGROUND OF THE INVENTION Adhesives are typically supplied as viscous liquids in plastic cartridges. The cartridge consists of an adhesive reservoir in a tube with a discharge nozzle at one end and a piston operating in the tube at the other end.

Often, the adhesive is supplied as multiple, usually two, separate materials that mix and react to form the adhesive in or near the discharge nozzle. In this case, the cartridge can be constructed as a suitable number of tubes arranged side by side or concentrically. When the discharge piston is forced into the tube, the materials are discharged into a common pipe where they are mixed and reacted before leaving the nozzle.

Particularly in the case of multi-tube arrangements, the force required for dispensing viscous materials has been found to be uncomfortably, and sometimes impossible, when using manual labor. Therefore, pneumatic dispensers have been developed. The bimnematic actuator is actuated by a trigger, which causes a plunger to abut each ejection piston and expel material from the tube.

Although the use of pneumatic actuators has solved the problem of applying sufficient force to the ejection piston, the applied forces often exceed those that can be handled by standard manual dispenser and cartridge configurations suitable for pneumatic actuators. It has been discovered that. Typically, double barrel cartridges are made from plastic material 1 and have a pair of small flanges extending perpendicular to the direction of the dispensing force. These flanges are used to engage corresponding grooves in the dispenser to mount the tube in front of the biasing device. It has been found that this flange is not designed to handle the forces associated with pneumatic biasing devices and these can become dislodged from their grooves rendering the device inoperable. Furthermore, if the material is particularly viscous, the pneumatic force has been found to be sufficient to expand the cartridge circumferentially and force the material to eject through the ejection piston.

Obviously, it would be desirable to be able to use standard cartridges without the risk of accidental or dislodged cartridges during operation.

It is an object of the present invention to provide a dispenser for viscous materials that is not only easy to load with conventional cartridges for viscous materials but also reliable in operation.

[Disclosure of the Invention] According to the present invention, there is provided a dispenser for discharging a viscous material from a cartridge having a dispensing hole at one end thereof, the dispenser comprising a keep capable of housing at least a portion of the cartridge; and a biasing device arranged to apply a material dispensing force to the reservoir, the keep being movably mounted relative to the biasing device to allow the cartridge to be loaded into the keep and in an inoperative position. The cartridge is movable between an operating position in which the cartridge is operably aligned with the biasing device.

Preferably, the keep has an end wall from which the discharge nozzle of the cartridge can protrude, the end wall being arranged to limit movement of the cartridge in the direction of the dispensing force. To this end, the end wall is preferably part of a housing having an inner wall having dimensions that are approximately the same as the cross-sectional dimensions of the cartridge.

Preferably, the keep pivots between activation, deactivation, and repositioning. In this case, the keep pivots about an axis perpendicular to the direction of the dispensing force.

The biasing device has one or more piston heads that engage ejection pistons mounted within corresponding cartridges. In this case, it is preferable to prevent the pivot shaft from intersecting with the discharge pillow. Additionally, the misalignment between the pivot axis and the ejection piston axis is preferably such that the dispensing force forces the keep toward the operative position.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Particular embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings.

Referring to the drawing, mixing two separated viscous materials,
The double barrel dispenser has a pneumatic cylinder 10 with a barrel 12 containing two mnemonic pistons 14. The piston 14 has two piston rods 16 whose axes intersect a common diameter of the pistons 14 and are located at the same distance from the piston 14 axis. Each piston rod 16 terminates in a biasing piston head 17.

Also attached to the piston 14 is a central rod 16A. Rod 16A runs parallel to piston rod 16 but is located above the center of piston 14. Rod 16A terminates in a head portion 17A of smaller diameter than head 17. The piston rod 16 passes through a closely fitting hole in the front end wall 18 of the cylinder 10, which hole provides a piston rod bearing. Considering the retracted position, the biasing piston head 17 and the head 17A are located at the extreme end of movement on the right side, as shown in FIG. In this position, wall 18
are received in corresponding grooves within, so that they are flush with this.

The cylinder 10 is attached to the upper end of the handle 20 by a collar 22. A self-tapping screw 24 is received into the wall of the cylinder 10 through a hole in the collar 22.

To hold the cylinder in place, the collar 22 is bolted to the handle 20 by bolts 26 that pass through holes in a flange 28 that is connected to a stock portion 33 formed at the front end of the collar 22. Kara nigiri 20
It's down on both sides.

The stock 30 is also formed with a bracket consisting of a pair of arms 32 extending upwardly to opposite sides of the biasing piston head 17.

Keep 34 is pivotally mounted between arms 32 and 33 by stud 36. Each stud has each arm 32.3
3 into an adjacent projection 38 formed on the outside of the keep. The common axis of the stud 36 is the piston rod 16
and is located above the axis of the cylinder 10.

The keep 34 consists of a pair of partially parallel tubular bodies connected to each other at their innermost ends so as to define a generally figure 8 cross section, into which a double barrel cartridge 40 of the material to be dispensed is placed. is inserted closely into this. The end of the keep 34 remote from the stock 30 is formed with an aperture 42 through which an exit portion 44 of a loaded double barrel cartridge projects.

In front of the handle 20 is a pivotally mounted trigger 48 which receives activated air from an air supply (not shown) connected to a threaded inlet 50 at the bottom of the handle 20. Used to control the control valve that regulates the flow path. The outlet of the control valve is connected to the rear of the pneumatic cylinder 10 via a flexible tube 52.

Flexible tube 52 is connected to the regulator and dump valve via an inlet. Dump valve 56 has a flexible plate 58. When trigger 48 is pulled, compressed air flows through flexible tube 52 and moves disk 58 to the left as viewed in FIG. The compressed air then passes around the end of the disc 58 and into the interior of the barrel 12 through the notch 60 in the valve body 62 where pressure is applied to the back side of the piston 14. When the trigger 48 is released, the pressure within the barrel 12 causes the disk 58 to move to the right in FIG. sudden pressure decrease (damping)
occurs.

The cartridge 40 includes a pair of separate holes in the same figure-eight plastic molding 54 and a dispense piston (not shown) in each hole that is used to force the viscous material toward the boss 44. ). The rear piston end of cartridge 40 is formed with a pair of straight flanges (not shown) oriented in the axial direction of the bore. When the cartridge is inserted into the keep 34, these flanges fit into corresponding grooves in the keep 34.

The cartridge is equipped with a cap screwed onto boss 44 and two holes filled with two types of material to be dispensed. Remove the cap from the boss and replace it with the nozzle.

To load cartridge 40, heads 17 and 17A
1. Return the door to its most retracted position so that it is virtually flush with the front plate 18. The keep 34 is then rotated about its pivot stud 36 to its inoperative position;
In this position, the end of the keep 34 that is closest to the cylinder 10 is normally exposed to allow insertion of the cartridge 40. The cartridge is inserted so that the nozzle of the boss 44 protrudes through the aperture 42 and its front surface abuts the end wall of the keep 34. After inserting the cartridge, the keep 34 is rotated to the operating position in which the piston end of the loaded cartridge passes through the front wall 18 and into the piston head 1.
It is aligned with 7.

To dispense a viscous material, the trigger is pulled and air from a supply connected to the screw inlet 50 acts on the surface of the air piston 14 and causes the piston head 17
is pulled out from the front wall 18 so that it comes into contact with the cartridge piston. In this manner, material is forced out of the nozzle 44 in a limited manner as the piston head extending into the respective hole pushes against the cartridge piston. As mentioned above, the cartridge fits tightly within the bore. This provides increased resistance to bending of the cartridge both axially and circumferentially as, in use, the cartridge becomes enveloped within the inner surface of the keep 34 both axially and circumferentially. . When the piston head 17 enters the cartridge 40, the head portion 17A of the rod 16A
It advances along the depressions of the glyphs to provide an indication of dispensed or remaining material. Since the axis of the stud 36, which is the axis of rotation of the keep 34, is above the center of the piston rod 16, the keep is forced to rotate clockwise, as shown in FIG. Try to keep it.

If it becomes necessary to replace the cartridge before the material in the cartridge 40 is fully dispensed, force is applied to the head portion 17A to force the rad 17 onto the piston into its fully retracted position. Push back.

Although this dispenser has been described with reference to a double barrel cartridge, it will be apparent to those skilled in the art that it can be applied to any number of barrels in the cartridge, or to separate cartridges, with appropriate matching of the biasing device. Will.

Furthermore, although the keep has been described as being rotatable about an axis perpendicular to the axis of the cartridge bore, it is possible to move outside the passageway of the piston head about another axis, e.g., parallel to the cartridge axis. may effectively roll between each position. Also, although the dispenser has been specifically described as having a pneumatic energizing device, it is to be understood that it may have other energizing devices having the same effect.

The present invention provides a restraint for storing a cartridge that can exert dispensing forces without relying on the inherent strength of the material from which the cartridge is made. By storing cartridges, the keep provides an easy way to easily and reliably load one or more cartridges. The alignment of the cartridge with the biasing piston head is therefore determined by a predetermined movement of the keep about its pivot axis.

[Brief explanation of the drawing]

1 is a side view of a dispenser according to the invention, FIG. 2 is a front end view of the dispenser of FIG. 1, and FIGS. 38 and 3b depict a portion of the dispenser shown in FIGS. FIG. 4 is a partial partial view of the right end of the disvenzer as shown in FIG. 1, showing the main dump and control valve. In the figure, 10 is a biasing device, 17 is a piston head,
34 is a key, 36 is a pivot shaft, 40 is a cartridge, 4
2 indicates a keep front end hole, and 44 indicates a discharge nozzle.

Claims (8)

[Claims] (1) a keep (34) adapted to receive at least a portion of the cartridge (40) and a biasing device (34) adapted to apply a material dispensing force to the cartridge;
10) for dispensing a viscous material from a cartridge (40) having a dispensing opening at one end, the keep (34) being movably attached to the biasing device (10) and dispensing with the cartridge (40). keeps (34)
and an operative position in which the fixed cartridge (40) is operatively aligned with respect to the biasing device (10). Dispenser for materials. 2. The dispenser of claim 1, wherein the keep (34) includes an end plate positioned to limit movement of the cartridge (40) in the direction of the dispensing force. 3. A dispenser according to claim 2, wherein the end plate is provided with a hole (42) through which a discharge nozzle (44) of the inserted cartridge projects. (4) the termination plate includes a housing (34) having an inner surface approximately equal to the corresponding outer dimensions of the insertion cartridge (40);
4. The dispenser according to claim 2 or 3, wherein the dispenser is a part of the dispenser. (5) A dispenser according to any one of the preceding claims, wherein the keep (34) is pivotable between operative and non-operative positions. 6. The dispenser of claim 5, wherein the keep (34) is pivotable about an axis (36) perpendicular to the direction of the dispenser force. (7) The biasing device (10) has one or more piston heads (17) arranged to apply a dispensing force to the ejection piston attached to the corresponding cartridge (40). A dispenser according to any one of the preceding claims. 8. The dispenser of claim 7, wherein the pivot axis (36) does not intersect the ejection piston axis so that the dispensing force forces the keep into the operative position.