WO2023175528A1

WO2023175528A1 - A bottle top dispenser

Info

Publication number: WO2023175528A1
Application number: PCT/IB2023/052512
Authority: WO
Inventors: Palekudy Sreejith Kumar Sukumaran
Original assignee: Borosil Technologies Limited
Priority date: 2022-03-15
Filing date: 2023-03-15
Publication date: 2023-09-21

Abstract

The present disclosure relates to and envisages a bottle top dispenser (100). The bottle top dispenser (100) comprises a casing (103), a glass tube (105) provided in the casing (103) for 5 fluid communication with a liquid reservoir (10), a spout (120) extending from the tube (105), a piston assembly (125) displaceably provided in the tube (105) to facilitate aspiration of liquid into the tube (105), to further facilitate dispensation of the liquid from the spout (120). The dispenser (100) further comprises a pointer assembly provided on the casing (103) having a first set of graduations (142) representing the volume of liquid. A pointer (155) is lockably displaced along the first set of graduations (142) to facilitate selection of a desired volume of liquid to be dispensed, and limit displacement of the piston assembly (125) to facilitate aspiration of the desired volume of liquid.

Description

A BOTTLE TOP DISPENSER

This application is a cognate application of 202221014051 dated 15.03.2022 and 202221046758 dated 17.08.2022.

FIELD

The present disclosure relates to bottle top dispensers.

BACKGROUND

The background information herein below relates to the present disclosure but is not necessarily prior art.

Bottle top dispensers are used in laboratories and applications where a precise measurement of liquid is needed to be dispensed. Usually, the liquids that are received in the dispensers are volatile and reactive liquids such as alkali solutions or acids, as a result of which the dispensers need to be autoclaved or cleaned frequently. Conventionally, dispensers are calibrated at the time of manufacturing. Subsequently, when the dispenser is autoclaved and dismantled for cleaning the components of the dispenser, the calibration is disturbed. To correct the calibration, the dispenser is again sent to a calibrating centre. However, sending the dispenser for calibration every time consumes a huge amount of time, which consecutively affects the iterations of an experiment.

Further, the typical dispenser comprises a glass tube having a piston assembly which when pulled up aspirates the liquid into the glass tube from a liquid reservoir. When the liquid is aspirated into the glass tube, some amount of the air is aspirated into the reservoir simultaneously to compensate for the displaced liquid. A typical bottle top dispenser will have one port aiding for this process. This port will lead to the evaporations of vapour even though the dispenser is not in use.

Another demerit of the conventional dispenser is that the conventional dispenser is fitted with a spring mechanism which allows the suction and dispensation of the liquid into the dispenser. However, over due course of time, the spring components start corroding, and can contaminate the liquid. Further, the spring mechanism consists of relatively larger number of components which adds to the complexity of its configuration and to the cost of the dispenser. Yet, once the spring tension reduces, the valve mechanism fails.

There is therefore felt a need for a dispenser that alleviates the aforementioned drawback. OBJECTS

Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:

An object of the present disclosure is to provide a bottle top dispenser.

Another object of the present disclosure is to provide a bottle top dispenser which is equipped with a provision for self-calibration by a user.

Yet another object of the present disclosure is to provide a bottle top dispenser which saves time and effort required for calibrating the dispenser by external calibration means.

Another object of the present disclosure is to provide a bottle top dispenser which provides a simple and safe means for dispensing varying volumes of the solution contained therewithin.

Still another object of the present disclosure is to provide a bottle top dispenser which prevents leakage of fumes of a solution contained in the dispenser.

Yet another object of the present disclosure is to provide a bottle top dispenser which has relatively lesser number of components, and therefore has a simpler configuration.

Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.

SUMMARY

The present disclosure envisages a bottle top dispenser. The bottle top dispenser comprises a casing, a glass tube provided in the casing for fluid communication with a liquid reservoir, a spout extending from the tube, a piston assembly displaceably provided in the tube to facilitate aspiration of liquid into the tube, to further facilitate dispensation of the liquid from the spout. The dispenser further comprises a pointer assembly provided on the casing having a first set of graduations representing the volume of liquid. A pointer is lockably displaced along the first set of graduations to facilitate selection of a desired volume of liquid to be dispensed, and limit displacement of the piston assembly to facilitate aspiration of the desired volume of liquid. The dispenser further includes a lid unit configured to be disposed on the casing. An operative bottom portion of the lid unit is configured to be connected to the piston assembly and to the casing, to facilitate displacement of the piston assembly on displacement of the casing.

The present disclosure further envisages a bottle top dispenser. The bottle top dispenser comprises a casing, a glass tube provided in the casing for fluid communication with a liquid reservoir, a spout extending from the tube, a piston assembly displaceably provided in the tube to facilitate aspiration of liquid into the tube, to further facilitate dispensation of the liquid from the spout. The dispenser further comprises a pointer assembly provided on the casing having a first set of graduations representing the volume of liquid. A pointer is lockably displaced along the first set of graduations to facilitate selection of a desired volume of liquid to be dispensed, and limit displacement of the piston assembly to facilitate aspiration of the desired volume of liquid. The dispenser further includes a lid unit configured to be disposed on the casing. The lid unit includes a guide configured to extend therefrom, and configured to be received in the casing. The guide is configured to be displaced along with the lid unit to facilitate displacement of the piston assembly.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING

A bottle top dispenser of the present disclosure will now be described with the help of the accompanying drawing, in which:

Figure 1 illustrates a side view of the dispenser of the present disclosure without a recirculation valve;

Figure 2 illustrates a cross-sectional view of the dispenser of Figure 1 ;

Figure 3 illustrates a side view of the dispenser of the present disclosure with a recirculation valve;

Figure 4 illustrates a cross-sectional view of the dispenser of Figure 2;

Figure 5 illustrates an exploded view of the dispenser of Figure 1 and Figure 2;

Figure 6A illustrates an isometric view of a first embodiment of the calibration ring of the dispenser of Figure 5; Figure 6B illustrates a top view of the first embodiment of the calibration ring of the dispenser of Figure 6A;

Figures 7A through 7B illustrate different views of the calibration ring of Figure 5

Figure 8 illustrate an exploded view of the piston assembly of a glass tube assembly of the dispenser of figure 5;

Figure 9 illustrates an isometric view of a second embodiment of the bottle top dispenser, of the present disclosure, mounted on a liquid reservoir;

Figure 10 illustrates an isometric view of the bottle top dispenser, of Figure 9;

Figure 11 illustrates an exploded view of the dispenser of figure 10;

Figure 12 illustrates an isometric view of the bottle top dispenser, of Figure 11, in an aspirating configuration;

Figure 13 illustrates an isometric view of the bottle top dispenser, of Figure 9, with a desiccant pouch attached thereto; and

Figure 14 illustrates an isometric view of the bottle top dispenser, of Figure 9, with an air filter attached thereto.

LIST OF REFERENCE NUMERALS

10 liquid reservoir

100 bottle top dispenser

101 piping

103 casing

105 glass tube

108 cap assembly

109 bottle adapter

111 valve ball guide A first ball B second ball fluid path seal A ball seat for first ball B ball seat for second ball protective cover valve seat spout delivery tube cap delivery tube grabbing nut split ring T-bolt piston assembly slider indicator piston rod tightening washer O-ring piston recirculation valve safe guard lock calibration ring 135 selector knob

136 selector

140 slit

142 first set of graduations

143 second set of graduations

145 lid unit

146 stopper cap

147 lid

150 holder

152 guide

155 pointer

160 fume locking cap

162 vapour seal

165 desiccant pouch

167 air filter

DETAILED DESCRIPTION

Embodiments, of the present disclosure, will now be described with reference to the accompanying drawing.

Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.

The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms "a,” "an," and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms "comprises," "comprising," “including,” and “having,” are open ended transitional phrases and therefore specify the presence of stated features, operations, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, operations, elements, components, and/or groups thereof.

When an element is referred to as being "mounted on," “engaged to,” "connected to," or "coupled to" another element, it may be directly on, engaged, connected or coupled to the other element. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed elements.

The terms first, second, third, etc., should not be construed to limit the scope of the present disclosure as the aforementioned terms may be only used to distinguish one element, component, region, layer or section from another component, region, layer or section. Terms such as first, second, third etc., when used herein do not imply a specific sequence or order unless clearly suggested by the present disclosure.

Terms such as “inner,” “outer,” "beneath," "below," "lower," "above," "upper," and the like, may be used in the present disclosure to describe relationships between different elements as depicted from the figures.

A bottle top dispenser (100), of the present disclosure, will now be described with reference to Figure 1 through Figure 14.

The bottle top dispenser (100) (hereinafter referred to as ‘the dispenser (100)’) is configured to be mounted on a liquid reservoir (10) (not shown in figures) to receive a desired quantity of liquid therein. The dispenser (100) is further configured to dispense the received quantity of liquid for facilitating a chemical process.

In accordance with a first embodiment, as shown in Figure 1 through Figure 9, the bottle top dispenser (100) comprises a casing (103) in which a glass tube (105) is provided. The tube (105) is configured to be in fluid communication with the liquid reservoir (10) to receive liquid therefrom. A spout (120) is configured to extend from the tube (105).

The dispenser (100) further comprises a piston assembly (125), and a pointer assembly. The piston assembly (125) is provided in the tube (105). The piston assembly (125) is configured to be linearly displaced in an operative first direction to facilitate aspiration of liquid into the tube (105), and is further configured to be linearly displaced in an operative second direction to facilitate dispensation of the liquid from the spout. The pointer assembly is provided on the casing (103) along an operative length thereof. The pointer assembly has a first set of graduations (142) representing volume of liquid, marked along the operative length of the casing (103). The pointer assembly further has a pointer (155) configured to be lockably displaced along the first set of graduations (142) to facilitate selection of a desired volume of liquid to be dispensed, and limit displacement of the piston assembly (125) in the operative first direction to facilitate aspiration of the desired volume of liquid. The dispenser (100) further includes a lid unit (145) configured to be disposed on the casing (103). An operative bottom portion of the lid unit (145) is configured to be connected to the piston assembly (125) and to the casing (103), to facilitate displacement of the piston assembly (125) on displacement of the casing (103).

In an embodiment, the bottle top dispenser includes a cap assembly (108) attached to an operative bottom of the tube (105). The cap assembly (108) is configured to enable mounting of the dispenser (100) on a mouth of the reservoir (10).

In another embodiment, the cap assembly (108) includes a flexible piping (101) extending therefrom. The piping (101) is configured to facilitate fluid communication between the liquid reservoir (10) and the tube (105).

In an embodiment, the cap assembly (108) includes a valve unit provided with a fluid path between the reservoir (10) and the tube (105) configured thereon. In another embodiment, the valve unit includes a pair of balls. A first ball (115A), of the pair of balls, has its ball seat (117A) provided in the tube (105) at an opening of the piping (101). A second ball (115B), of the pair of balls, has its seat (117B) provided in the tube (105) against the opening of the spout. In yet another embodiment, the first ball (115 A) is configured to be displaced from its seat (117A) when liquid is being aspirated into the pipe, while the second ball (115B) is configured to block the opening of the spout (120) to ensure that the aspirated liquid does not flow through the spout. In still another embodiment, the second ball (115B) is configured to be displaced from its seat (117B) when liquid aspirated in the tube (105) needs to be dispensed through the spout, and the first ball (115A) is configured to rest against the opening of the piping (101) to ensure that liquid does not flow back into the reservoir (10). Thus, the flow path of liquid is defined and controlled.

In an operative configuration of the dispenser (100), a user slides the pointer (155) from 0 to a graduation corresponding to the predetermined volume of the solution to be dispensed, and threadably locks the pointer (155) at that graduation. Thereafter, the holder is displaced upwards till the stopper of the guide (152) is locked against the pointer (155). As a result of the displacement of the guide (152), the piston (130) is displaced only till the graduation to enable aspiration of the desired volume of the solution. When the piston rod (127) of the piston assembly (125) is pulled upwards to a predefined level, a negative pressure is created inside the glass tube (105) which facilitates aspiration of the liquid from the reservoir (10) into the glass tube. Due to the negative pressure, the first ball (115 A), resting on the first ball seat (117A) is lifted, while the second ball (115B) is forced to be seated on the second ball seat (117B), thus causing the liquid to start flowing into the glass tube (105). Once the desired volume of the liquid is filled in the glass tube (105), the piston stops at the desired graduation, and the negative pressure is neutralized which causes the second ball (115B) to be lifted from the second seat (117B), while the first ball (115A) remains seated on the first seat (117A) blocking the liquid line to the bottle When the first ball is lifted from the second seat (117B), the liquid is dispensed through the spout.

The above mentioned working of the dispenser, of the present disclosure, eliminates the need of a spring components as required by conventional dispensers. As a result, any probability of the spring being corroded and the subsequent chances of contamination of the liquid are completely eliminated. Further, the spring mechanism has had a tendency of having its spring tension reduced, which often led to failure of the valve mechanism. The balls and the valve mechanism of the present disclosure, thus avoids this particular failure while ensuring that the cost of the dispenser further reduces.

In an embodiment, the casing (103) includes a slit (140) configured along the operative length thereof. The slit (140) has the first set of graduations (142) marked on at least one operative side thereof. The slit (140) is configured to receive the pointer (155) therein. In another embodiment, the pointer (155) is configured to be threadably locked in the slit (140). In yet another embodiment, the pointer (155) includes a slider indicator (126). The slider indicator (126) is provided with oppositely placed pair of hands that when placed on the first set of graduations (142) indicate the exact amount of liquid that needs to be aspirated.

In another embodiment, the piston assembly (125) includes a piston (130) and a piston rod (127) extending from the piston (130). The piston assembly (125) is configured to be pulled in upwards in the first operative direction, and is further configured to be pushed downwards in the second operative direction.

In an embodiment, the piston assembly (125) includes an O-ring (129) provided at between the piston (130) and the piston rod (127). The O-ring (129) is configured to prevent ingress of liquid into the piston assembly (125).

In an embodiment, the lid unit (145) includes a calibration unit is mounted on the tube (105). The calibration unit includes a calibration ring (134) having a second set of graduations (143) corresponding to the linear displacement of the piston assembly (125) marked thereon. The calibration unit further includes a selector knob (135) configured to extend from the piston assembly (125) and further configured to be mounted on the calibration ring (134). The selector knob (135) is configured to be rotated to facilitate calibration of the piston assembly (125) to factory settings.

Angular displacement of the selector knob (135) through a specific range determines a predefined range of linear displacement of the piston assembly (125). Therefore, the calibration of the dispenser (100) can be achieved by angularly displacing the selector knob (135). This calibration can be done at the location of the user, and as a result, there is no need for the dispenser (100) to be sent to a calibration centre for calibrating the dispenser (100), thereby saving time that is otherwise required for sending the dispenser (100) to the calibration centre and calibrating it to its factory settings.

In one embodiment, the selector knob (135) includes a selector (136) for selecting the desired angular displacement.

In a preferred embodiment, the second set of graduations (143) are marked on the calibration ring (134) after the first calibration is performed and before dispatching the dispenser (100), in a factory setting. Subsequently, when the dispenser (100) is autoclaved and dismantled for cleaning the components of the dispenser (100), the calibration is disturbed. In the process of reassembling the components of the dispenser (100), the calibration ring (134) is attached to the piston and is angularly displaced for a specific degree, so that the selector (136) of the selector knob (135) is aligned with the initial point of the second set of graduations (143) to initialize the calibration process.

In an embodiment, the lid having a holder (150) configured to nest the calibration unit therein, and a lid (147) configured to be removably mounted on the calibration unit. In another embodiment, a stopper cap (146) is threadably attached to the glass tube (105).

In another embodiment, an operative top end of the piston rod (127) is attached to the holder (150).

In accordance with a second embodiment, as shown in Figure 9 through Figure 14, the bottle top dispenser (100) comprises a casing (103) in which a glass tube (105) is provided. The tube (105) is configured to be in fluid communication with the liquid reservoir (10) to receive liquid therefrom. A spout (120) is configured to extend from the tube (105).

The dispenser (100) further comprises a piston assembly (125), and a pointer assembly. The piston assembly (125) is provided in the tube (105). The piston assembly (125) is configured to be linearly displaced in an operative first direction to facilitate aspiration of liquid into the tube (105), and is further configured to be linearly displaced in an operative second direction to facilitate dispensation of the liquid from the spout. The pointer assembly is provided on the casing (103) along an operative length thereof. The pointer assembly has a first set of graduations (142) representing volume of liquid, marked along the operative length of the casing (103). The pointer assembly further has a pointer (155) configured to be lockably displaced along the first set of graduations (142) to facilitate selection of a desired volume of liquid to be dispensed, and limit displacement of the piston assembly (125) in the operative first direction to facilitate aspiration of the desired volume of liquid. The dispenser (100) further includes a lid unit (145) having a guide (152) extending therefrom and configured to be received in the casing (103). The guide (152) is configured to be displaced along with the lid unit (145) to facilitate displacement of the piston assembly (125).

In an embodiment, the bottle top dispenser includes a cap assembly (108) attached to an operative bottom of the tube (105). The cap assembly (108) is configured to enable mounting of the dispenser (100) on a mouth of the reservoir (10). In another embodiment, the cap assembly (108) includes a flexible piping (101) extending therefrom. The piping (101) is configured to facilitate fluid communication between the liquid reservoir (10) and the tube (105).

In an operative configuration of the dispenser (100), a user slides the pointer (155) from 0 to a graduation corresponding to the predetermined volume of the solution to be dispensed, and threadably locks the pointer (155) at that graduation. Thereafter, the holder is displaced upwards till the stopper of the guide (152) is locked against the pointer (155). As a result of the displacement of the guide (152), the piston (130) is displaced only till the graduation to enable aspiration of the desired volume of the solution. When the piston rod (127) of the piston assembly (125) is pulled upwards to a predefined level, a negative pressure is created inside the glass tube (105) which facilitates aspiration of the liquid from the reservoir (10) into the glass tube. Due to the negative pressure, the first ball (115 A), resting on the first ball seat (117A) is lifted, while the second ball (115B) is forced to be seated on the second ball seat (117B), thus causing the liquid to start flowing into the glass tube (105). Once the desired volume of the liquid is filled in the glass tube (105), the piston stops at the desired graduation, and the negative pressure is neutralized which causes the second ball (115B) to be lifted from the second seat (117B), while the first ball (115A) remains seated on the first seat (117A) blocking the liquid line to the bottle When the first ball is lifted from the second seat (117B), the liquid is dispensed through the spout. The above mentioned working of the dispenser, of the present disclosure, eliminates the need of a spring components as required by conventional dispensers. As a result, any probability of the spring being corroded and the subsequent chances of contamination of the liquid are completely eliminated. Further, the spring mechanism has had a tendency of having its spring tension reduced, which often led to failure of the valve mechanism. The balls and the valve mechanism of the present disclosure, thus avoids this particular failure while ensuring that the cost of the dispenser further reduces.

In an embodiment, the lid unit (145) includes a holder unit configured to be connected to the guide (152). In another embodiment, the displacement of the guide (152) is limited by the pointer (155), thereby limiting the displacement of the piston.

In an embodiment, the casing includes a recirculation valve assembly configured to prevent air purging in the liquid flow path when the liquid is being aspirated into the glass tube (105). In an embodiment, a re-circulation safe guard lock (131) is attached to the operative top portion of the glass tube (105). In an embodiment, the casing includes a spout protection cap (132) and a protective cover (133) for closing the spout (120).

In an embodiment, an aperture is configured on an operative lower portion of the tube (105).

In another embodiment, the bottle top dispenser (100) includes a fume locking cap (160) configured to removably attached to the aperture. The fume locking cap (160) is configured to arrest the leakage of fumes from within the dispenser (100). In yet another embodiment, as shown in Figure 13, the bottle top dispenser (100) includes a desiccant pouch (165) configured to be attached to the aperture. The pouch (165) is configured to contain desiccants for absorbing fumes therein. In still another embodiment, as shown in Figure 14, the bottle top dispenser (100) includes an air filter (167) configured to be attached to the aperture to facilitate filtration of air being passed out through the fume locking cap (160).

The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment, but, are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.

TECHNICAL ADVANCEMENTS

The present disclosure described hereinabove has several technical advantages including, but not limited to, the realization of a bottle top dispenser, which:

• is equipped with a provision for self-calibration;

• saves time and effort required for calibrating the dispenser by external calibration means;

• provides a simple and safe means for dispensing varying volumes of the solution contained therewithin; prevents leakage of fumes of a solution contained in the dispenser; and has relatively lesser number of components, and therefore has a simpler configuration. The foregoing disclosure has been described with reference to the accompanying embodiments which do not limit the scope and ambit of the disclosure. The description provided is purely by way of example and illustration.

The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.

The foregoing description of the specific embodiments so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

Any discussion of materials, devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.

While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.

Claims

CLAIMS:

1. A botle top dispenser (100) configured to be mounted on a liquid reservoir (10), said botle top dispenser (100) comprising:

• a casing (103);

• a glass tube (105) provided in said casing (103), said tube (105) configured to be in fluid communication with the liquid reservoir (10) to receive liquid therefrom;

• a spout (120) configured to extend from said tube (105);

• a piston assembly (125) provided in said tube (105), said piston assembly (125) configured to be linearly displaced in an operative first direction to facilitate aspiration of liquid into said tube (105), and further configured to be linearly displaced in an operative second direction to facilitate dispensation of the liquid from said spout;

• a pointer assembly provided on said casing (103) along an operative length thereof, said pointer assembly having a first set of graduations (142) representing volume of liquid, marked along said operative length of said casing (103), and a pointer (155) configured to be lockably displaced along said first set of graduations (142) to facilitate selection of a desired volume of liquid to be dispensed, and limit displacement of said piston assembly (125) in said operative first direction to facilitate aspiration of said desired volume of liquid; and

• a lid unit (145) configured to be disposed on said casing (103), an operative botom portion of said lid unit (145) being configured to be connected to said piston assembly (125) and to said casing (103), to facilitate displacement of said piston assembly (125) on displacement of said casing (103).

2. The botle top dispenser (100) as claimed in claim 1, which includes a cap assembly (108) atached to an operative botom of said tube (105), said cap assembly (108) configured to enable mounting of said dispenser (100) on a mouth of the reservoir (10).

3. The botle top dispenser (100) as claimed in claim 2, wherein said cap assembly (108) includes a flexible piping (101) extending therefrom, said piping (101) configured to facilitate fluid communication between the liquid reservoir (10) and said tube (105). The bottle top dispenser (100) as claimed in claim 3, wherein said cap assembly (108) includes a valve unit having a fluid path between the reservoir (10) and said tube (105) configured thereon. The bottle top dispenser (100) as claimed in claim 4, wherein said valve unit includes a pair of balls, a first ball (115A) of said pair of balls having its ball seat (117A) provided in said tube (105) at an opening of said piping (101), and a second ball (115B) of said pair of balls having its seat (117B) provided in said tube (105) against the opening of said spout. The bottle top dispenser (100) as claimed in claim 5, wherein said first ball (115A) is configured to be displaced from its seat (117A) when liquid is being aspirated into said pipe, and said second ball (115B) is configured to block the opening of said spout (120) to ensure that the aspirated liquid does not flow through said spout. The bottle top dispenser (100) as claimed in claim 6, wherein said second ball (115B) is configured to be displaced from its seat (117B) when liquid aspirated in the tube (105) needs to be dispensed through said spout, and said first ball (115A) is configured to rest against the opening of said piping (101) to ensure that liquid does not flow back into the reservoir (10). The bottle top dispenser (100) as claimed in claim 1, wherein said casing (103) includes a slit (140) configured along said operative length thereof, said slit (140) having said first set of graduations (142) marked on at least one operative side thereof, said slit (140) being configured to receive said pointer (155) therein. The bottle top dispenser (100) as claimed in claim 8, wherein said pointer (155) is configured to be threadably locked in said slit (140). The bottle top dispenser (100) as claimed in claim 1, wherein said piston assembly (125) includes a piston (130) and a piston rod (127) extending from said piston (130), and configured to be pulled in upwards in said first operative direction, and further configured to be pushed downwards in said second operative direction. The bottle top dispenser (100) as claimed in claim 10, wherein said piston assembly

(125) includes an O-ring (129) provided at between said piston (130) and said piston rod (127), said O-ring (129) being configured to prevent ingress of liquid into said piston assembly (125).

12. The bottle top dispenser (100) as claimed in claim 1, wherein said lid unit (145) has a calibration unit mounted on said tube (105), said calibration unit includes a calibration ring (134) having a second set of graduations (143) corresponding to the linear displacement of said piston assembly (125) marked thereon, and a selector knob (135) configured to extend from said piston assembly (125) and further configured to be mounted on said calibration ring (134), said selector knob (135) configured to be rotated to facilitate calibration of said piston assembly (125) to factory settings.

13. The bottle top dispenser (100) as claimed in claim 12, wherein said lid unit (145) includes a holder (150) configured to nest said calibration unit therein, and a lid (147) configured to be removably mounted on said calibration unit.

14. The bottle top dispenser (100) as claimed in claim 13, wherein an operative top end of said piston rod (127) is attached to said holder (150).

15. The bottle top dispenser (100) as claimed in claim 12, wherein the displacement of said casing (103) is limited by said pointer (155), thereby limiting the displacement of said piston rod (127).

16. A bottle top dispenser (100) configured to be mounted on a liquid reservoir (10), said bottle top dispenser (100) comprising:

• a casing (103);

• a spout configured to extend from said tube (105);

• a lid unit (145) configured to be disposed on said casing (103), said lid unit (145) including a guide (152) extending therefrom and configured to be received in said casing (103), said guide (152) configured to be displaced along with said lid unit (145) to facilitate displacement of said piston assembly (125).

17. The bottle top dispenser (100) as claimed in claim 16, which includes a cap assembly (108) attached to an operative bottom of said tube (105), said cap assembly (108) configured to enable mounting of said dispenser (100) on a mouth of the reservoir (10).

18. The bottle top dispenser (100) as claimed in claim 17, wherein said cap assembly (108) includes a flexible piping (101) extending therefrom, said piping (101) configured to facilitate fluid communication between the liquid reservoir (10) and said tube (105).

19. The bottle top dispenser (100) as claimed in claim 18, wherein said cap assembly (108) includes a valve unit having a fluid path between the reservoir (10) and said tube (105) configured thereon. 0. The bottle top dispenser (100) as claimed in claim 19, wherein said valve unit includes a pair of balls, a first ball (115A) of said pair of balls having its ball seat (117A) provided in said tube (105) at an opening of said piping (101), and a second ball (115B) of said pair of balls having its seat (117B) provided in said tube (105) against the opening of said spout. 1. The bottle top dispenser (100) as claimed in claim 20, wherein said first ball (115 A) is configured to be displaced from its seat (117A) when liquid is being aspirated into said pipe, and said second ball (115B) is configured to block the opening of said spout to ensure that the aspirated liquid does not flow through said spout. 22. The botle top dispenser (100) as claimed in claim 20, wherein said second ball (115B) is configured to be displaced from its seat (117B) when liquid aspirated in the tube (105) needs to be dispensed through said spout, and said first ball (115 A) is configured to rest against the opening of said piping (101) to ensure that liquid does not flow back into the reservoir (10).

23. The botle top dispenser (100) as claimed in claim 16, wherein said casing (103) includes a slit (140) configured along said operative length thereof, said slit (140) having said first set of graduations (142) marked on at least one operative side thereof, said slit (140) being configured to receive said pointer (155) therein.

24. The botle top dispenser (100) as claimed in claim 23, wherein said pointer (155) is configured to be threadably locked in said slit (140).

25. The botle top dispenser (100) as claimed in claim 16, wherein said piston assembly (125) includes a piston (130) and a piston rod (127) extending from said piston (130), and configured to be pulled in upwards in said first operative direction, and further configured to be pushed downwards in said second operative direction.

26. The botle top dispenser (100) as claimed in claim 25, wherein said piston assembly (125) includes an O-ring (129) provided at between said piston (130) and said piston rod (127), said O-ring (129) being configured to prevent ingress of liquid into said piston assembly (125).

27. The botle top dispenser (100) as claimed in claim 16, wherein said lid unit (145) includes a holder unit configured to be connected to said guide (152).

28. The botle top dispenser (100) as claimed in claim 16, wherein the displacement of said guide (152) is limited by said pointer (155), thereby limiting the displacement of said piston.

29. The botle top dispenser (100) as claimed in claim 16, wherein an aperture is configured on an operative lower portion of said tube (105).

30. The botle top dispenser (100) as claimed in claim 29, which includes a fume locking cap (160) configured to removably atached to said aperture, said fume locking cap (160) configured to arrest the leakage of fumes from within said dispenser (100). The bottle top dispenser (100) as claimed in claim 29, which includes a desiccant pouch (165) configured to be attached to said aperture, said pouch configured to contain desiccants for absorbing fumes therein. The bottle top dispenser (100) as claimed in claim 29, which includes an air filter (167) configured to be attached to said aperture to facilitate filtration of air being passed out through said fume locking cap (160).