WO1989006097A1

WO1989006097A1 - Dosing propelling pencil for dispensing free-flowing materials

Info

Publication number: WO1989006097A1
Application number: PCT/EP1988/001149
Authority: WO
Inventors: Otto Katz
Original assignee: Georg Karl Geka-Brush Gmbh
Priority date: 1987-12-31
Filing date: 1988-12-13
Publication date: 1989-07-13
Also published as: DE3885621D1; ES2011939A6; EP0400019A1; EP0400019B1

Abstract

A dosing propelling pencil for dispensing free-flowing materials comprises a reservoir (1) containing a movable piston (16) which contacts a longitudinally sliding threaded rod (13). Said rod is mounted in a rotary actuating element (3) and in a guide bush (4). All parts of the arrangement, as well as the filling material, can be inserted in the reservoir from a given assembly side.

Description

Metering pin for dispensing flowable masses

The invention relates to a metering pen for dispensing flowable masses according to the preamble of claim 1. Flowable masses, in particular those which are only flowable under pressure due to their viscosity or because of their pasty character, overcome an increased flow resistance in the capillary with the aid of a piston. Clearing order elements such as brushes, wick or sponge.

According to US Pat. No. 2,629,889, it is known to move a piston in a storage container by rotating a spindle.

This embodiment differs disadvantageously from the present invention in the following features:

1. Not the spindle but the nut drives the piston. This requires a large length of an internal thread, which is difficult to produce with today's plastic injection molding processes.

2. The nut is secured against rotation in such a way that stop edges extend over the whole

Extend stroke length. The piston with its sealing lips must be pulled over these longitudinal edges, which can lead to damage. In the present invention, the piston is retracted back into the container, whereby the

Sealing lips remain undamaged.

3. The piston must be inserted from the back into the storage container with the sealing lips first. This arrangement is laboriously introduced into a second tube, the rear stop of which is necessary.

The filling can only take place by means of a narrow cannula, since not the entire diameter of the storage container is available, as in the present invention. An embodiment variant provides that the nut provided for actuation is exposed laterally, but the disadvantage arises that when the piston is screwed in, the grip area of the nut becomes ever smaller and unwieldy. In the present invention, the operating area remains unchanged.

According to US Pat. No. 3,739,789, an embodiment is shown in which the piston runs on a spindle and itself represents the transport nut. This has the following disadvantages compared to the invention:

1. The piston must be secured against rotation in order to transmit the propulsion. This is done in the present case in that the container wall receiving the piston is not round but octagonal. A reliable seal is not possible.

2. The sealing of the piston against the threaded spindle is also problematic.

3. The assembly is complex because the piston must first be screwed onto the threaded spindle. The invention is based on the object of supplying flowable masses from a storage container to an application element, the flow resistance occurring thereby being overcome.

The operation should be handy and offer a reproducible measure for the dosage.

The number of individual parts should be a minimum to fulfill the task and their design and arrangement should enable machine-appropriate assembly with little effort.

This object is achieved in a generic device by the characterizing features of claim 1.

This has the advantage that the threaded rod is almost completely absorbed by the actuating element and the guide bush in the starting position, as a result of which the smallest possible overall length can be achieved. Another advantage is the small number of components, which increases functional reliability. From Figure 1 it can be seen, for example, that only the guide bushing is required for the axial fixing of the actuating element and for the rotation of the threaded rod.

The threaded rod is a symmetrical structure and is therefore easy to sort and assemble. The arrangement enables easy assembly and filling from one side, which makes the assembly devices simple. If the order element is changed, all other components remain unaffected. In the embodiment according to FIG. 1, the actuating element can be reached and rotated by the operating fingers through side windows. Such an arrangement has the advantage that unintentional actuation and thus leakage is avoided when carried in clothes or bags.

In a further advantageous embodiment, the movement thread of the actuating element is followed by a centering diameter, the length of which represents a multiple of the movement thread. This leads to an additional guidance of the threaded rod, which makes it particularly easy to move.

In a further embodiment of the guide bushing, this is provided with a toothing, as a result of which an axial and radial fixation in the storage container is achieved.

As a further advantageous detail, the actuating element has, on the end facing the floor, radially arranged pawls which engage in corresponding counter pawls on the floor. It is thereby achieved that the reaction force of the piston expelling the mass creates a locking mechanism without additional parts, which prevents reset, on the other hand provides the user with an acoustic measure of the actuation path. A simple axial fixing of the actuating element is achieved on the one hand by the stop surface of the guide bush and on the other hand by the bottom of the storage container. (Fig.1)

Another embodiment of the axial fixing of the actuating element is shown in FIG. 2. Here, the actuating element is located within the stop surface and the undercut of resilient segments. Among the embodiments discussed above, a guide bushing has already been described, which is secured against the storage container in such a way that a payment located on the guide bushing and on the storage container results in an axial and radial fixation.

The disadvantage here is that an exact coincidence of tooth and gap is a prerequisite for assembly, which can only be done mechanically with such mass products. Such a requirement can only be met to a limited extent with the speed of the work method. Since a certain amount of friction between the inner diameter of the guide bush is required for the axial fixation of the guide bush, it is also not possible to orient gear teeth beveled with respect to one another with certainty.

Another disadvantage is that the attachment of the teeth in the reservoir, a reinforcement of the wall in the region of the actuating element is necessary in order to be able to carry out a demolding in the injection molding process. This reduces the diameter of the actuating element and thus increases the actuating force to be applied. In addition, there is a greater depth for the access to the actuating element, which makes the actuation less user-friendly.

It is therefore desirable to attach the guide bushing in such a way that axial and radial fixation is achieved by simple assembly and that the inside diameter of the storage container does not have to be reduced.

This is achieved in a further embodiment of the invention in that a guide bushing is diametrically two has arranged segments which are separated by longitudinal slots and that the resilient end of the segments has a rotation stop which comes to rest radially on a web and a longitudinal stop which bears axially on a window edge.

It is advantageous here that when the actuating element, threaded rod and guide bush are preassembled, this unit is inserted completely and without radial orientation into the sleeve until the stop edges of the guide bush come to lie behind the window edges, or until the actuating element is at the bottom of the Reservoir is present.

The mounting plunger on the end of the guide bush resiliently generates friction, so that when the actuating element is rotated, the guide bush is rotated until its segments can spring open in the web-free zone and come to rest radially on the web and axially on the window edge . As a result, the guide bush is fixed radially and axially, the radial stop corresponding to the direction of rotation of the actuating element, which moves the piston forward.

Embodiments of the invention are shown in the drawings and are described in more detail below.

Show it:

1 shows a longitudinal section through the metering pin.

2 shows a cross section in the area of the pawls.

3 shows a cross section in the area of the windows.

4 shows a cross section on the movement thread.

5 shows a cross section at the passage of the guide bush.

6 shows a longitudinal section through the metering pin with the actuating element protruding from the end of the container.

7 shows a cross section through the actuating element and threaded rod of FIG. 6

8 shows a partial longitudinal section and partial view of the guide bush with resilient segments.

9 shows a view of the guide bush of FIG. 8 in the axial direction. Fig. 10 partial longitudinal section of a modified

Dosing pin in the area of the guide bush and the actuating element during assembly.

Fig. 11 partial longitudinal section as above, after assembly and rotation of the guide bush.

Fig. 12 section III-III through the guide bush.

Fig. 13 section IV-IV after assembly and after twisting the guide bush.

Fig. 14 View of the guide bush in the direction of the piston.

Fig. 15 section VI-VI through the guide bush.

Execution Fig. 1 to 5;

In a storage container 1, a storage space 2 is provided, in which the flowable mass, not shown, is located.

The actuating element 3 is rotatably mounted in the guide bush 4 and with its outer diameter 5 in the storage container 1.

At the front end of the actuating element 3 there is the movement thread 6, to which the centering diameter 7 connects. The actuating element 3 is axially fixed within the stop surface 8 and the base 9. Molded inwards on the bottom 9, there are the radially arranged pawls 11, which correspond to the counter pawls 10 on the actuating element 3.

The actuating element 3 can be reached and rotated through the windows 12.

The flattened threaded rod 13 is screwed into the movement thread 6 and is additionally guided in the centering diameter 7. The threaded rod 13 protrudes through the passage 14, which corresponds to the contour of the threaded rod 13. This creates an anti-rotation device with simultaneous longitudinal movement of the threaded rod 13.

The guide bush 4 has a toothing 15 which has its counterpart in the reservoir 1 and is used for the radial and longitudinal fixation of the guide bush 4. The threaded rod 13 is supported on the piston 15, which seals and transports the flowable mass located in the storage container 1.

The mounting side 17 of the storage container 1 is closed by the fastening thread 18 with the application element 19. The latter can have a different design. In the present case, it is equipped with a brush 23. Execution Fig. 6 to 9

The structure of the rotary metering pin according to FIGS. 5 to 9 represents a variant within the inventive concept.

Here, the actuating element 3 'protrudes freely from the end of the storage container 1'.

The axial fixing with simultaneous rotatability of the actuating element 3 'takes place on the one hand via the stop surface 8, on the other hand via the segments 20 which are integrally formed on the guide bushing 4' and which have an undercut 21 and snap into an annular groove 22 of the actuating element 3 '.

10 to 15: A storage container 1 with storage space 2 is shown in the area of an actuating element 3.1. A guide sleeve 4.1, which has four slots 4.2, adjoins this via a stop surface 8. This creates four resilient segments 4.3 and 4.4, the opposite segments being identical. The segments 4.4 form at their resilient end a twist stop 4.5, which comes to rest on a web 12.1, and a longitudinal stop 4.5, which rests on a window edge 12.2 (FIG. 11). The segments 4.3 have non-stop edges 4.7 at their resilient end. An outer diameter 5.1 of the actuating element 3.1 is rotatably mounted in the storage container 1. In the area that lies in the guide bush 4.1, the actuating element 3.1 contains a movement thread 6, into which the threaded rod 13 is screwed. This leads on the one hand in the centering diameter 7, on the other hand in the passage 14 of the guide bush 4.1. The actuating element 3.1 lies in the installed state on the floor 9.1. (Fig.11). The storage container 1 has two opposite windows 12 on the side, which represent cutouts from the cylinder jacket of the storage container 1 and from which two webs 12.1 are retained.

When assembling, it is assumed that the actuating element 3.1, the spindle 13 and the guide bush 4.1 are preassembled outside the storage container 1. This unit is pushed into the storage container 1 from the mounting side 17. The diametrically arranged segments 4.4 spring back with their longitudinal stop 4.6 to the inside diameter of the storage container 1. (Fig. 10) The diameter of the actuating element 3.1 is dimensioned in the area of the segments 4.4 in such a way that sufficient space is available for the springback. As soon as the actuating element 3.1 touches the floor 9.1, the longitudinal stops 4.5 are located in the area of the window 12, just behind the window edge 12.2. A spring-open in the stop position (Fig. 11) is possible if the longitudinal stops 4.6 are not in the area of the webs 12.1. If the stop position is locked, the actuating element 3.1 is axially fixed between the floor 9.1 and the stop surface 8. It is thereby achieved that on the one hand the reaction forces of the piston 16 are supported on the bottom 9.1, on the other hand the actuating element 3.1 cannot be inadvertently shifted to the piston side, thereby avoiding overdosing.

The anti-rotation device is achieved in that when the actuating element 3.1 is rotated, the guide bushing 4.1 also rotates until the rotation stop 4.5 has reached the web 12.1. The friction, which is required for the rotating entrainment of the guide bush 4.1, is generated in the stop surface 8 by means of the axial shaft of the assembly plunger, which rests resiliently on the guide bush 4.1.

If the longitudinal stops 4.6 are located radially in the area of the webs 12.1 during assembly, the segments 4.4 can only spring open if the guide bush 4.1 is rotated such that the longitudinal stops 4.6 reach the area of the window 12 or the window edge 12.2.

In both radial assembly positions of the guide bush 4.1, an axial and radial fixation of the guide bush 4.1 is achieved by turning. The mode of operation of the dosing rotary pin according to FIG. 1 is correspondingly simple in its construction. By turning the actuating element 3 on the windows 12, the threaded rod 13, which is slidable in the guide bush 4 but secured against rotation at the passage 14, is displaced longitudinally via the movement thread 6. In the starting position, the threaded rod 13 advantageously extends over the entire longitudinal region of the actuating element 13, as a result of which the shortest possible overall length can be achieved.

The longitudinal movement of the threaded rod 13 is transferred to the piston 16, which in turn exerts pressure on the flowable mass located in the storage space 2. The capillary spaces of the application element 19 fill up, making it possible to dispense the flowable mass.

The pawl 10, which is axially loaded during the rotation of the actuating element 3, snaps audibly. noticeable in the counter pawl 11 of the bottom 9. The effect of this locking mechanism gives the user a measure of the dispensed quantity. In addition, the pawl 10/11 prevents rotation against the conveying direction.

The mode of operation of the dosing rotary pin according to FIG. 6 is the same as the aforementioned. In contrast to Fig. 1, operation is carried out using an exposed rotary knob. In addition, this version eliminates the pawl with the locking effect.

Claims

Metering rotary pin for delivering flowable masses from a storage container to an application element by means of a piston which is moved by a spindle which is connected to a rotatable actuating element, characterized in that a longitudinally displaceable threaded rod (13) in a rotatable actuating element (3, 3 ') and in a guide bush (4,4') and that all the parts assigned to the storage container (1,1 ') (3,3'-4,4'-13-16-19) and the filling compound from the assembly side (17) can be used.

2. Dosing rotary pin according to claim 1, d a d u r c h g e k e n n z e i c h n t that the actuating element (3) through side windows (12) through, is rotatable.

Dosing rotary pin according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the moving thread (6) of the actuating element (3,

3 ') connects a centering diameter (7,7'), the length of which represents a multiple of the movement thread (6).

4. dosing pin according to claims 1 and 3, characterized in that the passage (14) of the guide bush (4,4 ') corresponds to the outer contour of the cross section of the longitudinally flattened threaded rod (13).

5. dosing pin according to claims 1 to 4, d a d u r c h g e k e n n z e i c h n e t that the guide bush (4,4 ') by means of teeth (15) axially and radially in the reservoir (1, 1') can be fixed.

6. dosing pin according to claims 1 to 5, characterized in that the actuating element (3) on the, the bottom (9) facing end face, radially arranged pawls (10) which engage in corresponding counter pawls (11) on the bottom (9) .

Dosing rotary pin according to claims 1 to 6, that the actuating element (3) is axially delimited by the stop surface (8) and by the base (9)

8. Dosing rotary pin according to claims 1, 3, 4, 5, d a d u r c h g e k e n n e e c h n e t that the actuating element (3 ') is axially fixed within the stop surface (8) and the undercut (21).

Dosing rotary pin according to claims 1, 3, 4, 5, 8, characterized in that the guide bush (4 ') has segments (20) which can be sprung open at the undercut (21) and can be latched into the annular groove (22).

10. dosing pin according to one of claims 1 to 4, characterized in that the guide bushing (4.1) each has two diametrically arranged segments (4.3) and (4.4) which are separated by longitudinal slots (4.2) and that the resilient end of the segments ( 4.4) has a twist stop (4.5) which comes to rest radially on a web (12.1) and a longitudinal stop (4.6) which bears axially on a window edge (12.2).

11. dosing pin according to claim 10, characterized in that the outer diameter of the longitudinal stops (4.6) of the segments (4.4) abut resiliently during assembly on the inner diameter of the storage container (1) (Fig. 10).

12. dosing pin according to claim 10, characterized in that the reservoir (1) has a constant inner diameter over its entire length