CN101300085A - Device for dispensing doses of fluid substances having different viscosities and densities - Google Patents

Abstract

The invention relates to a device for dispensing doses of fluid substances having different viscosities and densities, comprising: a container (11); a piston (25) housed and moving in a chamber (24) formed by a portion of the container; a tank (33) formed by the rest of the container and designed to contain the substance to be dispensed; a metering mechanism (12) associated with and movable with the piston (25); a pre-load urging means (27) associated with the piston with the metering mechanism to urge it generally towards the contents of the tank; and a stop element (13) between the metering mechanism and the container for alternately arresting and releasing the piston so that it is moved forward by a length corresponding to a dose of substance under the urging of said preloaded elastic means.

Description

Device for dispensing doses of fluid substances with different viscosities and densities

technical field

The present invention relates to a new type of device primarily, but not exclusively, for containing fluid substances of different viscosities and densities or equally of different granular powder.

Background technique

On the one hand, metering devices for fluid substances are known which have a container containing a certain amount of substance to be dosed, but which require manual intervention by using a screw or other means to expel and dispense a fixed dose each time substance in the container.

But on the other hand, the fluid substance to be metered varies according to its nature and the way it will be used. Due to their aggregated state, these substances may actually have different viscosities or densities, which in itself poses problems for achieving regular, standard metering - each substance behaves differently and requires suitable and specific metering means/tools.

In general, the devices known so far require the aid of an energy source—even human power—every time they are operated, ie each time they are used.

Contents of the invention

It is an object of the present invention to effectively solve said problems by using a device for the above-mentioned applications, the operation of which is carried out by means of a latent pre-set energy source which, when released as required, will cause a suitable A pusher element acting on the substance so that it is dispensed in a predetermined dose is gradually moved in steps.

Another object of the present invention is to propose a device designed to contain and dispense in an automatic manner a fluid substance pre-metered for a single dosing - regardless of the viscosity or density of the fluid.

Yet another object is to propose and provide a user-friendly and reliable device which is easily and reproducibly operated by simply pressing on the metering switch without other interventions on the device component parts.

A further object of the present invention is to provide a metering and dispensing device with which regular doses can be delivered independently of the viscosity and density of the substance, wherein the pushing element is pushed forward slightly by means of a pre-set energy source Shifts allow dosage to be increased to meet requirements.

Another object of the present invention is to provide a metering and dispensing device that can be discarded or replaced for continued use.

These objects and potential advantages thereby are achieved by a device for dispensing predetermined doses of fluid substances of different densities comprising: a cylindrical container having a proximal closed end and an open distal end; a piston received and moved in a chamber formed by a portion of the container adjacent to the closed end; a magazine formed by the remainder of the container adjacent to the open end and designed to accommodate a fluid substance to be delivered; a metering mechanism located in said chamber, which is associated with a piston in said container and moves with the piston; associated with said piston with said metering mechanism to push the piston usually Preloaded resilient means moving towards the contents of the tank; a stop element located between the metering mechanism and the container barrel for alternately blocking and releasing said piston to control its advancement in said preloaded resilient means The lower moves forward in steps, each step corresponding to dispensing a dose of substance from the distal opening of the chamber to an applicator coupled to the container barrel.

Additionally, a single acting valve and header may be interposed between the tank and the applicator, the single acting valve being normally closed and opening only under the thrust from the piston acting on the material in the tank.

Description of drawings

The invention will be explained in more detail in the following description with reference to the accompanying drawings, which are schematic and non-limiting, in which:

Figure 1 shows a sectional view of a device according to the invention;

Figure 2 shows the proximal portion of the container barrel of the device;

Figure 3A, B and C show the front view, rear view and side view of the metering mechanism, respectively;

Figures 4A, B and C show front, rear and side views, respectively, of the proximal portion of the barrel and associated metering mechanism in Figure 2;

Figure 5 shows a sectional view according to arrow V-V in Figure 4A;

Figure 6 shows an exploded view of the distal portion of the container barrel of the device and elements associated therewith;

Figure 7 shows an external view of an example of a complete device; and

Figure 8 shows a transparent viewable device assembly.

Detailed ways

The device of the invention basically comprises a container 11 , a metering mechanism 12 , a control button 13 , a single-acting valve 14 , a header 15 and a replaceable applicator 16 operating in combination. These parts can be die cast from plastic material.

Preferably, the container 11 consists of a proximal barrel 17 and a distal barrel 18 aligned with each other and possibly permanently joined.

In particular, one end of the proximal barrel 17 is closed by the wall of the top 19 from which a guide rod 20 extends towards the interior of the barrel. The opposite end of the proximal barrel 17 is open and fitted with a circumferential coupling system 21 designed to couple and form a seal with a complementary coupling system 22 and the adjacent end of the distal barrel 18 . The other end of the distal barrel is open and is also fitted with a coupling system 23 in order to accommodate a single-acting valve 14 associated with a header 15 together with the applicator.

The proximal barrel 17 forms a chamber 24 in which the metering mechanism 12 is located. The mechanism comprises a piston 25 guided and axially sliding in said chamber, mounted with a hollow stem 26 facing and receiving the guide rod 20, and pressurized by at least one pusher to move it progressively forward.

Said urging means, for example formed by a preloaded spring 27, are located around said guide rod 20 and in said handle 26, held between the top wall of the proximal barrel and the piston. Alternatively, the pushing means may be formed by compressed gas filled in the chamber 24 between the top wall and the piston.

Piston 25 cooperates with the inner surface of chamber 24 formed by proximal barrel 17 to form a seal. A metering plate 28 can be seen longitudinally from one side of the piston shaft 26 , which has two parallel rows of teeth: a row of teeth 29 for metering and another row of teeth 30 for control. The teeth of each row are evenly spaced and spaced, with the teeth of the metering row offset relative to the teeth of the control row. On one side of the proximal barrel 17 there is an opening designed to receive the control button 13 . This button is positioned laterally movable in front of the plate 28 with the two metering and control tooth rows 29 , 30 . Said button 13 is actuated by a spring 31 and has a finger 32 designed to mesh alternately with the teeth of the metering tooth row 29 and the control tooth row 30 to move progressively forward together with the piston.

The distal barrel 18, when engaged with the proximal barrel 17, forms a tank 33 having a volume formed between the piston 25 and the single-acting valve 14 and designed to receive initial quantities of fluids of different viscosities. .

In the example of the figures, the single-acting valve 14 comprises a valve body 34 connected upwardly to the free end of the distal barrel and a valve plate 35 actuated by a spring 36 . In particular, the valve body 34 forms a transfer chamber 37 of fluid from the tank 33 to the header 15 designed for subsequent feeding of the applicator 16 .

The delivery chamber 37 communicates on one side with the tank 33 via a valve seat 38 provided in the wall substantially forming the bottom of said box 33; on the other side it has a bottom wall with a hole 39 through which the delivery chamber The holes communicate with the header 15 .

The valve plate 35 is associated with the valve seat 38 and is generally maintained in the closed position of the valve seat by being urged by an associated spring 36 to prevent fluid substances from flowing out of the tank 33 .

It should be noted that the header 15, preferably of conical shape, has a fluid substance outlet channel 40 towards the applicator 16 and may be fitted with a safety valve.

Applicators can have various configurations.

By way of illustration and not limitation, the applicator can be of the brush, pad, tubular type, have the shape of a toothbrush, etc., depending on how the applicator is used and the application of the substance being delivered. In addition, the device may have a protective cover 41 which may be mounted on the single-acting valve and/or on the cover 42 of the header and accommodates the applicator when associated with the tank.

Knowing the volume/capacity of the tank, the distance between the teeth 29, 30 on the metering plate 28 will be chosen according to the amount of dose of fluid substance to be delivered per forward movement of the piston.

In fact, the progressive forward movement of the piston 25 is caused by the preloaded spring 27 and is carried out each time by using the control button 13 to release it from the tooth 29 with which it is currently engaged and to engage the next tooth 30, In order to stop the piston automatically after it has moved forward.

Initially, the piston 25 moves backwards against the action of the spring 27 and is stopped in this position by means of the button 13 whose finger 32 engages the first tooth 29 of the metering plate (the tooth closest to the piston).

In order to dispense the fluid substance introduced into the distal barrel 18 to be used by the applicator 16, the control button 13 is simply employed so that it releases the piston 25, which is pushed forward by an associated spring 27 to move one step forward, at Pressure is created on the substance to push it towards the single acting valve 14 . This pressure then causes the single acting valve to open and ultimately allows the substance to flow through the hole in the bottom wall of the valve body into header 15 and from there to applicator 16 for dispensing as desired.

For more viscous substances such as gels, emulsions, monohydric solutions and similar, the single-acting valve can be replaced by a perforated bottom 43, so that the dose of the substance to be delivered can always pass through said bottom due to the thrust of the piston. The holes from the tank formed by the distal barrel to the header can in particular be standard. In addition, the device can also be used for metering solid and powdery substances with different particle sizes.

In any case, the dose of the substance to be dispensed and used is standardized due to the same and predetermined forward movement of the piston - due to the regular action of the preloaded spring and the control of the toothed metering plate - - The latter is released each time by using the control button.

Claims (11)

1. A device for dispensing doses of fluid substances of different viscosities or densities, such as solutions, emulsions, gels, etc., to be used by applicators, characterized in that: a container barrel (11) having a proximal closed end and an open distal end, a piston (25) received adjacent to said closed end and movable in a chamber (24) formed by a portion of said container, a tank (33) formed adjacent to said open end by the remainder of said container, which tank is designed to contain a fluid substance to be dispensed, a metering mechanism (12) located in said chamber, which metering mechanism is associated with and moves with a piston (25) in said container, a preloaded pusher element (27) associated with said piston with said metering mechanism for moving the piston generally towards the substance in the tank, a stop element (13) located between the metering mechanism and the container barrel for alternately blocking and releasing said piston at regular advancing intervals under the thrust of said preloaded spring element, which corresponds to A dose of the substance is dispensed at each interval from the distal end of the bay towards an applicator that can be coupled to the container barrel. 2. Device according to claim 1, characterized in that a single-acting valve (14) and/or a header (15) for the dose to be dispensed is fitted between the open end of the tank and the applicator. 3. Device according to claim 1, characterized in that, depending on the type of substance to be metered, a bottom with a standard hole or a counterbore is fitted between the open end of the tank and the applicator. 4. The device according to claim 1, 2 or 3, characterized in that the container cylinder is formed by connecting a proximal cylinder (17) and a distal cylinder (18) at their adjacent ends; The proximal cylinder forms a piston and a housing chamber (24) for the metering mechanism, and the distal cylinder forms a tank (33) for the fluid substance and holds the applicator directly or indirectly. 5. The device according to claims 1 and 2, characterized in that the single-acting valve (14) has a valve body cooperating with the open end of the container cylinder and a valve plate actuated by a closing spring, wherein the The valve body forms the delivery chamber (37) of the fluid substance from the tank (33) to the header (15) designed to feed the applicator (16); said delivery chamber (37) is on one side Communication with the tank (33) via a valve seat (38) provided in a wall substantially forming the bottom of said tank (33); said delivery chamber has a perforated bottom wall on the other side (39), and communicate with the header (15) through the hole; the valve plate (35) is associated with the valve seat (38), and is usually pushed by the relevant spring (36) to enter the closed position of the valve seat , to stop the fluid substance from flowing out from the feed box (33). 6. The device of claim 5, wherein the piston has a hollow stem that slides along an axial guide rod extending from the proximal closed end of the container, wherein the metering mechanism is associated with one side of the stem of the piston and along the The side extends. 7. Device according to the preceding claims, characterized in that the metering mechanism is formed by a plate connected to the piston stem and supporting a metering tooth row (29) and a control tooth row (30), wherein the tooth row In parallel, the teeth of each column are evenly arranged and spaced apart, and the teeth of the metering column are misaligned at regular intervals relative to the teeth of the control column. 8. Device according to claim 1, characterized in that the preloading element consists of at least one spring positioned between the guide rod and the piston handle. 9. The device of claim 1, wherein the preloaded pusher element is compressed gas positioned between the piston and the proximal closed end of the container. 10. Device according to the preceding claim, characterized in that said stop element comprises a resilient button inserted in the container, oriented transversely to the metering mechanism and having a finger designed to Used to alternately mesh with the teeth of the metering tooth row 29 and the teeth of the control tooth row 30, so as to control the piston to move forward regularly in predetermined steps. 11. The device according to any one of the preceding claims, characterized in that a single-acting valve is used to control a dose of fluid substance from the collection chamber or tank (17) to the collection chamber through the distal opening of the container ( 13), the single-acting valve is normally closed and only opens when there is pressure on the fluid substance as the plunger is pushed forward by the preloaded elastic element.

Images