DESC:FIELD OF THE INVENTION
The present invention relates to air cleaners for use in vehicles, and more specifically, the present invention relates to a dust evacuation valve for an air cleaner, the air cleaner being employed in a vehicle.
BACKGROUND OF THE INVENTION
A vehicle’s internal combustion engine requires an efficient and easy to maintain air cleaner. The most essential part of the air cleaner is an air filter assembly fitted to provide clean air for efficient combustion inside the internal combustion engine. Further, the air cleaner is an assembly of an air pre-cleaner, an air cleaner, and an air conduit. The air cleaner in a vehicle provides filtered air to an Internal Combustion (IC) engine. To provide the filtered air, atmospheric air is sucked into the air cleaner, wherein the air cleaner cleans the air, and the filtered air is then supplied to the IC engine through the air conduit. Upon ingress of the filtered air into the IC engine, oxygen in the filtered air interacts with fuel in the IC engine to facilitate the combustion of the fuel. The filtered air needs to be provided to the IC engine at a pre-determined air pressure to obtain optimum fuel combustion.
Generally, the air cleaner comprises a dust evacuation tube pointing towards the ground and configured to evacuate dust collected in the air cleaner. Further, the dust evacuation tube comprises a dust evacuation valve mounted on the dust evacuation tube configured to open and close during dust evacuation. Typically, in countries such as India, there is water logging on the roads, the water tends to enter the air cleaner through the dust evacuation valve as soon as the dust evacuation valve opens for dust evacuation, thereby damaging the air cleaner. Additionally, conventional solutions fail to provide an effective solution.
OBJECTS OF THE INVENTION
Some of the objects of the presently disclosed invention, of which at the minimum one object is fulfilled by at least one embodiment disclosed herein, are as follows.
An object of the present invention is to provide an alternative, which overcomes at least one drawback encountered in the existing prior art.
Another object of the present invention is to provide a dust evacuation valve for an air cleaner.
Still another object of the present invention is to provide a dust evacuation valve for an air cleaner for a vehicle.
Yet another object of the present invention is to provide a dust evacuation valve for an air cleaner for a vehicle wherein the dust evacuation valve prevents ingress of water therethrough.
Another object of the present invention is to provide a dust evacuation valve for an air cleaner wherein the dust evacuation valve prevents damage to the air filter disposed within the air cleaner.
Other objects and benefits of the present invention will be more apparent from the following description, which is not intended to bind the scope of the present invention.
SUMMARY OF THE INVENTION
The present invention relates a dust evacuation valve for an air cleaner, the air cleaner being employed in a vehicle.
In accordance with the present invention a dust evacuation valve for an air cleaner is disclosed, wherein the dust evacuation valve is operatively coupled with a dust evacuation tube of the air cleaner.
The dust evacuation valve comprising an operative upper portion, which is configured to be coupled with the dust evacuation tube, the operative upper portion comprising a cylindrical body having an operative upper end, an operative lower end, and a peripheral wall, wherein the peripheral wall having a groove to receive a holding member for securing the operative upper portion to the dust evacuation tube.
The dust evacuation valve further includes an operative lower portion extending from the operative lower end of the body, the operative lower portion comprising a first tapering wall, and a second tapering wall, each being disposed at an angle ? with respect to a central axis passing through a geometric center of the dust evacuation valve, such that the free ends of the first tapering wall, and the second tapering wall are disposed to define a slit therebetween.
Further, a pair of lips are provided one each extending from the respective free ends, the pair of lips being configured to be normally closed and open for dust evacuation. A groove is configured on an inner surface of the cylindrical body at and around the operative lower end, a holder is received in the groove, the holder having a holding arrangement, and a valve vacua engageably and sealably received by the holder, the valve vacua configured to facilitate dust evacuation from the air cleaner while simultaneously preventing ingress of water and foreign matter into the air cleaner.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
The present invention will now be described with the help of the accompanying drawing, in which:
FIG. 1 illustrates an isometric view of an air cleaner with a dust evacuation valve in accordance with the embodiments of the present invention.
FIG. 2 illustrates a schematic diagram of a dust evacuation valve in accordance with the embodiments of the present invention.
FIG. 3 illustrates a cross-sectional view of the dust evacuation valve of FIG. 2.
FIG. 4 illustrates an isometric cross-sectional view of the dust evacuation valve of FIG. 2.
FIG. 5A illustrates a schematic diagram of a holder used in the dust evacuation valve in accordance with an embodiment of the present invention.
FIG. 5B illustrates a schematic diagram of a holder used in the dust evacuation valve in accordance with another embodiment of the present invention.
FIG. 6 illustrates a schematic diagram of a valve vacua used in the dust evacuation valve in accordance with the embodiments of the present invention.
LIST OF NUMERALS
100 - Dust evacuation valve
102 - Operative upper portion
104 - Cylindrical body
104g - Groove
104h - Holding member
104l - Operative lower end
104w - Peripheral wall
106 - Operative lower portion
106f1 - Free ends
106f2 - Free ends
106s - Slit
106w1 - First tapering wall
106w2 - Second tapering wall
108l1 - Pair of lips
108l2 - Pair of lips
108r - Rib
110 - Groove
112 - Holder
112a - Holding arrangement
112b - Concave disc
112bu - Operative upper surface
112bl - Operative lower surface
112d1 - First diametrical member
112d2 - Second diametrical member
112e - Horizontal members
112g - Complimentary groove
112h - Central hole
112o - Loop
112p1 - Hollow posts
112p2 - Hollow posts
112t - Tab
114 - Valve vacua
114a - Body
114b - Elongated member
114c - Flange
114c1 - Operative upper surface
114c2 - Operative lower surface
114d - Collar
114e1 - Operative upper end
114e2 - Operative lower end
114f - Collar
200 - Air cleaner
202 - Dust evacuation tube
206 - Air cleaner housing
208 - Air outlet tube
210 - Air inlet tube
DETAILED DESCRIPTION
All technical terms and scientific expressions used in the present invention have the same meaning as understood by a person skilled in the art to which the present invention belongs, unless and otherwise specified.
As used in the present specification and the claims, the singular forms “a,” “an” and “the” include plural references unless the context clearly dictates otherwise.
The term "comprising” as used in the present specification will be understood to mean that the list following is non-exhaustive and may or may not include any other extra suitable things, for instance one or more additional feature(s), part(s), component(s), process step(s), sub-step(s), and /or constituent(s) as applicable.
Further, the terms “about” and “approximately" used in combination with ranges of sizes of parts, particles, compositions of mixtures, and/or any other physical properties or characteristics, are meant to include small variations that may occur in the upper and/or lower limits of the ranges.
Disclosed herein is a dust evacuation valve for an air cleaner, the air cleaner being employed in a vehicle, wherein the dust evacuation valve prevents ingress of water and any other foreign material therethrough into the air cleaner thereby preventing damage to the air filter disposed within the air cleaner.
The dust evacuation valve of the present invention is now described with reference to the accompanying drawing, wherein FIG. 1 illustrates an isometric view of an air cleaner with a dust evacuation valve in accordance with the embodiments of the present invention, FIG. 2 illustrates a schematic diagram of a dust evacuation valve in accordance with the embodiments of the present invention, FIG. 3 illustrates a cross-sectional view of the dust evacuation valve of FIG. 2, FIG. 4 illustrates an isometric cross-sectional view of the dust evacuation valve of FIG. 2, FIG. 5A illustrates a schematic diagram of a holder used in the dust evacuation valve in accordance with an embodiment of the present invention, FIG. 5B illustrates a schematic diagram of a holder used in the dust evacuation valve in accordance with another embodiment of the present invention, and FIG. 6 illustrates a schematic diagram of a valve vacua used in the dust evacuation valve in accordance with the embodiments of the present invention.
In accordance with the embodiments of the present invention, a dust evacuation valve (100) for an air cleaner (200) is disclosed. The dust evacuation valve (100) is configured to be operatively coupled with a dust evacuation tube (202) of the air cleaner (200). FIG. 1 illustrates an isometric view of an air cleaner (200) with a dust evacuation valve (100) in accordance with the embodiments of the present invention. The air cleaner (200) comprises a housing (206) which may be substantially cylindrical in shape. The housing (206) comprising an operative top end and an operative bottom end and a peripheral wall enclosing a space therewithin. A filter element (not shown in the figure) is operatively received within the space. The housing (206) has an air inlet (210), which is configured to receive air from an air source, for example, atmosphere. Furthermore, an air outlet (208) is configured on the peripheral wall of the housing, wherein the filtered air is passed therethrough to a utility, for example, an engine of a vehicle. Further, the housing (206) is provided with a dust evacuation tube (202), wherein the dust evacuation tube (202) extends from the peripheral wall of the housing (206), and the dust evacuation tube (202) is connected to and in fluid communication with the space within the housing (206). The dust evacuation tube (202) facilitates in removal of dust from the housing (206).
The dust evacuation tube (202) has to be covered and selectively opened to remove the dust accumulated within the housing (206) over a period of time. If the dust evacuation tube (202) is left open, there is always a possibility that water (specifically in rainy season), and other foreign material may enter the housing (206) and damage the filter element housed therewithin. Therefore, in the known art the dust evacuation tube (202) is coupled with a dust evacuation valve. But it is observed that the conventional dust evacuation valves have certain drawbacks. For example, water tends to enter the air cleaner through the dust evacuation valve as soon as the dust evacuation valve opens for dust evacuation, thereby damaging the air cleaner which may be attributed to improper functioning or design of the conventional dust evacuation valve.
In the light of the above-discussion, the inventors of the present invention have invented a dust evacuation valve (100), which overcomes one or more drawbacks of the conventional dust evacuation valve (100).
In accordance with the embodiments of the present invention, the dust evacuation valve (100) comprises an operative upper portion (102), and an operative lower portion (106). The operative upper portion (102) is configured to be coupled with the dust evacuation tube (202). The operative upper portion (102) comprises a body (104) having an operative upper end (104u), an operative lower end (104l), and a peripheral wall (104w). The body (104) may be cylindrical or any other shape which conforms with the shape of the dust evacuation tube (202) or may have a shape that can be easily coupled with the dust evacuation tube (202).
In accordance with one embodiment of the present invention, the dust evacuation valve (100) may be made of any suitable material, for example, rubber. Any other material is also well within the ambit of the present invention and the present invention is not limited to rubber. For example, a portion of the dust evacuation valve (100) may be made of rubber, whereas the remaining portion of the dust evacuation valve may be made of plastic. Other materials are also well within the ambit of the present invention.
The peripheral wall (104w) of the body (104) may be provided with a groove (104g) running on an operative outer surface of the body (104). The groove is configured to receive a holding member (104h) for securing the operative upper portion (102) to the dust evacuation tube (202). The holding member (104h) can be any device that can secure the dust evacuation valve (100) to the dust evacuation tube (202) in a sealing manner. In accordance with one embodiment of the present invention, the holding member (104h) can be a circlip. In accordance with another embodiment of the present invention, the holding member (104h) can be an elastic member, for example, a rubber band. Any other holding member (104h) is also well within the ambit of the present invention and the present invention is not limited to these above-mentioned examples.
In another embodiment, instead of having a holding member (104h), the dust evacuation valve (100) may be coupled to the dust evacuation tube (202) by other means such as a threaded screw or may be welded or may be snap fitted.
In accordance with the embodiments of the present invention, the operative lower portion (106) extends from the operative lower end (104l) of the body (104). In accordance with one embodiment of the present invention, the operative lower portion (106) may extend integrally from the operative lower end (104l) of the body (104). In accordance with another embodiment of the present invention, the operative lower portion (106) may extend non-integrally from the operative lower end (104l) of the body (104). In accordance with still another embodiment of the present invention, the operative lower portion (106) may extend partially integrally and partially non-integrally from the operative lower end (104l) of the body (104).
In accordance with the embodiments of the present invention, the operative lower portion (106) comprises a first tapering wall (106w1), and a second tapering wall (106w2). Each of the first tapering wall and the second tapering wall may be disposed at an angle ? with respect to a central axis (C-C’) passing through a geometric center of the dust evacuation valve (100), such that the free ends (106f1, 106f2) of the first tapering wall (106w1), and the second tapering wall (106w2) are disposed to define a slit (106s) therebetween.
In accordance with one embodiment of the present invention, the angle ? may be in the range of 35° to 45°. In accordance with one specific embodiment of the present invention, the angle ? is 41.2°.
Further, the dust evacuation valve (100) includes a pair of lips (108l1, 108l2) one each extending from the respective free ends (106f1), and (106f2) of the first and the second tapering walls, respectively. The pair of lips (108l1, 108l2) are configured to be normally closed. The pair of lips (108l1, 108l2) are configured to selectively open for dust evacuation purposes. The pair of lips (108l1, 108l2) are made of a resilient material such as rubber, wherein the pair of lips are responsible for maintaining the dust evacuation valve closed normally. Further, the lips are pressed at edges thereof to remove the dust from the air cleaner, and after this upon releasing the edges, the pair of lips close to seal the dust evacuation valve.
In accordance with one embodiment of the present invention, each of the pair of lips (108l1, 108l2) includes a rib (108r) on an operative inner surface thereof. The rib (108r) provides some stiffness and also closes the gap between the two lips.
In accordance with the present invention, the dust evacuation valve (100) further includes a groove (110) which is configured on an inner surface of the body (104) at and around the operative lower end (104l) thereof. The groove (110) is configured to receive a holder (112) therein. The holder (112) comprises a holding arrangement (112a), and a valve vacua (114) engageably and sealably received by the holder (112), the valve vacua (114) is configured to facilitate dust evacuation from the air cleaner (200) while simultaneously preventing ingress of water and foreign matter into the air cleaner (200).
In accordance with one embodiment of the present invention, the holder (112) is received in the groove (110) such that the holder (112) sealably fit within the groove (110) by interference fit.
In accordance with one embodiment of the present invention, the valve vacua (114) comprise a body (114a). The body (114a) comprising an elongated member (114b) having an operative upper end (114e1), and an operative lower end (114e2). In accordance with one embodiment of the present invention, a portion of the elongated member (114b) at and around the operative lower end (114e2) is hollow and configures a two-prong structure. The two prong like structure helps in fitment of the valve vacua with the holder (112) or the holding arrangement (112a) described herein below.
Further, a collar (114f) extends from the outer surface of the elongated member (114b) at and around a point between the operative upper end (114e1), and the operative lower end (114e2). The collar (114f) is configured to engage with the holding arrangement (112a) so as to secure the valve vacua to the holding arrangement (112a). In one embodiment, the collar (114f) extends from a geometric center of the elongated member (114b). In another embodiment, the collar (114f) extends from a position which is away from the geometric center of the elongated member (114b).
Still further, a flange (114c) each extends horizontally and away from each of the two-prongs of the elongated member (114b). The flange (114c) forms an umbrella like structure (see FIG. 6). In accordance with one embodiment of the present invention, the flange (114c) is characterized by having a thickness d1 at and around the two-prongs, and d2 at a free end of the flange (114c), wherein d1 is greater than d2. This kind of profile or shape of the flange (114c) affords resilience to the flange (114c) and further facilitates in removal of dust just by bending of the free ends of the flange (114c) which may be achieved manually or using air pressure or the like.
In some embodiments, the flange (114c) may include a collar (114d) extending in an operative upward direction from the free end of the flange (114c). The collar (114d) is configured to snap fit in complimentary recesses configured on the holding arrangement (112a) or the holder (112).
In accordance with one embodiment of the present invention, the holding arrangement (112a) comprises a concave disc (112b). The concave disc (112b) is characterized by having an operative upper surface (112bu), and an operative lower surface (112bl) opposite to the operative upper surface (112bu). The disc (112b) is having a central hole (112h). The central hole (112h) is a through hole. The holding arrangement (112a) fits at the bottom or at and around the bottom of the operative upper portion of the dust evacuation valve (as can be seen in FIG. 3). The concave disc (112b) along with the valve vacua (114) in a manner seals the passage formed in the dust evacuation valve.
In accordance with one embodiment of the present invention, the concave disc (112b) further includes a first diametrical member (112d1) and a second diametrical member (112d2), which are disposed bridging the central hole (112h), such that a loop (112o) is configured at the point of crossing of the first diametrical member (112d1), and the second diametrical member (112d2). Though, FIG. 5A, and FIG. 5B depicts only two diametrical members, it is possible to have more than two diametrical members. The diametrical members (112d1, 112d2) and the loop (112o) each support the valve vacua (114), particularly the flange portion thereof.
The loop (112o) is configured to receive and engage the elongated member (114b), wherein the collar (114f) engages with the loop (112o) preventing further movement of the elongated member (114b), and the first diametrical member (112d1), and the second diametrical member (112d2) each configured to support the flange (114c).
In accordance with one embodiment of the present invention, the flange (114c) is having an operative upper surface (114c1), and an operative lower surface (114c2). In one embodiment, the operative lower surface (114c2) is disposed at an angle ?, wherein the angle ? being in the range of 95° to 105°.
In accordance with one embodiment of the present invention, a collar (112d) is configured to snap fit in a complimentary groove (112g) configured on the operative lower surface (112bl), thereby securing the flange (114c) to the holding arrangement (112a).
In accordance with one embodiment of the present invention, the concave disc (112b) may include a pair of hollow posts (112p1, 112p2) extending from the operative upper surface (112bu). The pair of hollow posts (112p1, 112p2) facilitate securing of the dust evacuation valve (100) such that the hollow posts get pressed when fitting the concave disc in the groove, facilitates fitting of the holder or the concave disc into the groove (110).
In accordance with one embodiment of the present invention, the concave disc (112b) may further include a tab (112t) which extends operatively upwards from one of the first diametrical member (112d1) and the second diametrical member (112d2) and abutting with the loop (112o). The tab (112t) facilitates handling of the dust evacuation valve (100).
In accordance with one embodiment of the present invention, the central hole (112h) may have horizontal members (112e) extending from a periphery of the central hole (112h). The horizontal members (112e) are further configured to support the flange (114c).
In accordance with one embodiment of the present invention, the operative upper portion (102) may have a diameter in the range 30 mm to 100 mm, the operative lower portion (106) may have a diameter in the range of 25 mm to 90 mm, the ratio of the diameters of operative upper portion (102) to the operative lower portion (106) is in the range of 0.33 to 4, and the pair of lips (108l1, 108l2) being separated from each other by a separation distance in the range of 0.1 mm to 1 mm.
In a working configuration, the dust evacuation valve (100) is fitted onto an air cleaner (200) as described herein above over the dust evacuation tube (202) of the air cleaner (200) using a circlip (104h). The dust evacuation valve (100) is made of rubber and the operative upper portion (104) of the dust evacuation valve (100) can be slid over the dust evacuation tube (202). The dust evacuation valve (100) is having the holder (112) or the holding arrangement (112a) along with the valve vacua secured thereon with the flanges (114c) and the elongated member (114b) suitably coupled with the holding arrangement (112a) as shown in FIG. 3 and FIG. 4, and further lips closed.
When the dust is to be removed from the air cleaner, the flanges (114c) are displaced by employing force (manually or using air pressure or the like) so that the dust accumulated in the air cleaner passes into the dust evacuation valve (100), particularly into the upper portion, and then through the central hole into the lower portion. Thereafter, the edges of the lips open to exhaust the dust out of the dust evacuation valve and immediately close thereafter due to the resilience of the lips. Thus, the dust evacuation hole or port (202) of the air cleaner is open only for a brief time period. Further, there is no possibility of ingress of water or any foreign material through the dust evacuation valve (100) of the present invention, which avoids damage to the filter element disposed within the air cleaner.
TECHNICAL ADVANTAGES AND ECONOMICAL SIGNIFICANCE
The present invention provides the following technical advances or advantages and economical significance:
The evacuation valve of the present invention prevents ingress of water and/or other foreign material into the air cleaner therethrough.
The evacuation valve of the present invention prevents damage to the air filter by avoiding ingress of water and/or other foreign material into the air cleaner.
The evacuation valve of the present invention is simple and easy to make, install, operate, and maintain.
Further, the evacuation valve of the present invention is cost effective/economic.
,CLAIMS:We claim:
1. A dust evacuation valve (100) for an air cleaner (200), the dust evacuation valve (100) being operatively coupled with a dust evacuation tube (202) of the air cleaner (200), the dust evacuation valve (100) characterized by having:
- an operative upper portion (102), which being configured to be coupled with the dust evacuation tube (202), the operative upper portion (102) comprising a cylindrical body (104) having an operative upper end (104u), an operative lower end (104l), and a peripheral wall (104w), wherein the peripheral wall (104w) having a groove (104g) to receive a holding member (104h) for securing the operative upper portion (102) to the dust evacuation tube (202),
- an operative lower portion (106) extending from the operative lower end (104l) of the operative upper portion (102), the operative lower portion (106) comprising a first tapering wall (106w1), and a second tapering wall (106w2), each being disposed at an angle ? with respect to a central axis passing through a geometric center of the dust evacuation valve (100), such that the free ends (106f1, 106f2) of the first tapering wall (106w1), and the second tapering wall (106w2) are disposed to define a slit (106s) therebetween,
- a pair of lips (108l1, 108l2) one each extending from the respective free ends (106f1), and (106f2), the pair of lips (108l1, 108l2) being configured to be normally closed and open for dust evacuation,
- a groove (110) configured on an inner surface of the cylindrical body (104) at and around the operative lower end (104l),
- a holder (112) received in the groove (110), the holder (112) having a holding arrangement (112a), and
- a valve vacua (114) engageably and sealably received by the holder (112), the valve vacua (114) configured to facilitate dust evacuation from the air cleaner (200) while simultaneously preventing ingress of water and foreign matter into the air cleaner (200).
2. The dust evacuation valve (100) as claimed in claim 1,
wherein the operative upper portion (102) is coupled to the dust evacuation tube (202) by the holding member (104h), wherein the holding member (104h) is a circlip, and
wherein the dust evacuation valve (100) is made of rubber.
3. The dust evacuation valve (100) as claimed in claim 1,
wherein the angle ? is in the range of 35° to 45°, and wherein the angle ? is 41.2°
4. The dust evacuation valve (100) as claimed in claim 1, wherein the valve vacua (114) having a body (114a), the body (114a) comprising
- an elongated member (114b) having an operative upper end (114e1), and an operative lower end (114e2), wherein a portion of the elongated member (114b) at and around the operative lower end (114e2) being hollow and configuring a two-prong structure, and a collar (114f) extending from the elongated member (114b) at and around a point between the operative upper end (114e1), and the operative lower end (114e2), the collar (114f) configured to engage with the holding arrangement (112a), and
- a flange (114c) each extending horizontally and away from each of the two-prongs of the elongated member (114b), the flange (114c) having a thickness d1 at and around the two-prongs, and d2 at a free end of the flange (114c), wherein d1 is greater than d2, and a collar (114d) extending in an operative upward direction from the free ends of the flange (114c).
5. The dust evacuation valve (100) as claimed in claim 4, wherein the holding arrangement (112a) having a concave disc (112b), the concave disc (112b) having an operative upper surface (112bu), and an operative lower surface (112bl) opposite to the operative upper surface (112bu), the disc having a central hole (112h), wherein a first diametrical member (112d1) and a second diametrical member (112d2) are disposed bridging the central hole (112h), such that a loop (112o) is configured at the point of crossing of the first diametrical member (112d1), and the second diametrical member (112d2), the loop (112o) configured to receive and engage the elongated member (114b), wherein the collar (114f) engages with the loop (112o) preventing further movement of the elongated member (114b), wherein the first diametrical member (112d1), and the second diametrical member (112d2) each configured to support the flange (114c),
wherein the flange (114c) having an operative upper surface (114c1), and an operative lower surface (114c2), the operative lower surface (114c2) being disposed at an angle ?, wherein the angle ? being in the range of 95° to 105°,
wherein the concave disc (112b) includes a pair of hollow posts (112p1, 112p2) extending from the operative upper surface (112bu), wherein the pair of hollow posts (112p1, 112p2) facilitate securing of the dust evacuation valve (100),
wherein the concave disc (112b) includes a tab (112t) extending operatively upwards from one of the first diametrical member (112d1) and the second diametrical member (112d2) and abutting with the loop (112o), the tab (112t) facilitates handling of the dust evacuation valve (100).
6. The dust evacuation valve (100) as claimed in claim 5, wherein the central hole (112h) having horizontal members (112e) extending from a periphery of the central hole (112h), the horizontal members (112e) configured to support the flange (114c).
7. The dust evacuation valve (100) as claimed in claim 5, wherein the collar (114d) is configured to snap fit in a complimentary groove (112g) configured on the operative lower surface (112bl), thereby securing the flange (114c) to the holding arrangement (112a).
8. The dust evacuation valve (100) as claimed in claim 1, wherein each of the pair of lips (108l1, 108l2) includes a rib (108r) on an operative inner surface thereof.
9. The dust evacuation valve (100) as claimed in claim 1,
wherein the operative upper portion (102) having a diameter in the range 30 mm to 100 mm, the operative lower portion (106) having a diameter in the range of 25 mm to 90 mm,
wherein the ratio of the diameters of operative upper portion (102) to the operative lower portion (106) is in the range of 0.33 to 4, and
wherein the pair of lips (108l1, 108l2) being separated from each other by a separation distance in the range of 0.1 mm to 1 mm.
10. The dust evacuation valve (100) as claimed in claim 1, wherein the holder (112) being received in the groove (110) such that the holder (112) sealably fit within the groove (110) by interference fit.
Dated this 15th day of February 2021
For the Applicant

Deepak Pradeep Thakur
The Applicant’s Patent Agent
IN/PA – 3687
To,
The Controller of Patents
The Patent Office,
At Mumbai