AU2007362967B2

AU2007362967B2 - An aerosol container of the nail gun and the filling method therefore

Info

Publication number: AU2007362967B2
Application number: AU2007362967A
Authority: AU
Inventors: Yuhong Chen
Original assignee: Nanjing Toua Hardware & Tools Co Ltd
Current assignee: Nanjing Toua Hardware & Tools Co Ltd
Priority date: 2007-12-18
Filing date: 2007-12-18
Publication date: 2012-08-02
Anticipated expiration: 2027-12-18
Also published as: CN101883726B; AU2007362967A1; CN101883726A; WO2009079829A1

Abstract

An aerosol container of the nail gun includes a container body, a valve body (3), a valve core (5), a sealing ring (4) and an elastic piece (8). The upper end of the valve body (3) is flush mounted in the container body. The lower end of the valve body (3) is in tight connection with an inner bag (1). The valve core (5) is installed in the valve body (3). The upper end of the valve core (5) forms a tubular valve nozzle. An inner circumference B and an outer circumference A are manufactured on the upper end of the valve body (3), and the inner circumference B is lower than the outer circumference A. The lower end face of the sealing ring (4) abuts against the upper end of the inner circumference B, and the margin of the sealing ring (4) is contained in the outer circumference A. When the valve core (5) is in the first axial position, the upper necking section C and the lower necking section D is respectively located inside and out side of said boss, and the upper surface and the lower surface of the sealing ring (4) respectively abut closely to the boss and the inner circumference B; when the valve core (5) is in the second axial position, the upper necking section C locates on the opening of the boss, and the upper surface of the sealing ring (4) departs from the lower surface of the boss. Therefore, it's convenient to fill, and it's effective to prevent gas leakage.

Description

tnglsn i ranslanon or ru i ruoncanion AEROSOL CONTAINER OF NAIL GUN AND FILLING METHOD THEREFOR TECHNICAL FIELD The present invention relates to an improved fuel container which supplies fuels to the power-driven tool for a fastener, more particularly, to an aerosol container of nail gun and the filling method therefor. BACKGROUND OF THE INVENTION The tool that drives the fastener by thermal power (such as a nail gun) has been used widespreadly in many fields such as building upholster. And it has been respectively described in US patents Re32,452, US4,403,722, US4,483,473, US4,483,474, US5,197,646 and US5,263,439. To use the above mentioned tools that drive the fasteners by thermal power, it needs a fuel container filled with fuel as an operating medium so as to provide fuel to the tool combustion chamber through a delivery valve. The patent US5,115,944 has disclosed a typical structure of this kind of fuel dispenser, which includes an outer canister, an inner bag, a delivery valve, a canister cover. The jet valve meshes in the canister cover and its nozzle protrudes out of the canister cover; the inner bag is pressed. tightly to and sealed with the jet valve, the canister cover is tightly buckled and sealed with the outer canister. The pressurized propellant fuel is contained inside the outer canister and outside the inner bag, the canister cover is tightly buckled and sealed with the outer canister until the pressurized propellant fuel is filled into the cavity between the outer canister and the inner bag. It is proved by practice that, this kind of fuel dispensers have shortcomings as follows: 1) Because pressurized propellant gas (normally it is flammable gas having same essential constituents as that inside the inner bag) is filled to the outer canister firstly before the canister cover is tightly buckled and sealed with the outer canister, lots of pressurized propellant gas is lost, which increases the production cost and causes pollution to the environment. 2) It is difficult to reliably seal the inner bag and the delivery valve, which would lead to leakage. Besides, German patent DE20212802 has disclosed an assembly comprising a container cover, a delivery valve and an inner bag, the inner bag of the assembly is connected and sealed with the lower valve body of the delivery valve by hot-welding, cligusui I I nIiuiunl Ui rv I r UUniadLuu the lower valve body is connected and flat sealed with the upper valve body by a sealing element. It is proved by practice that, this assembly has shortcomings as follows: 1) Because pressurized propellant gas (normally it is flammable gas having same essential constituents as that inside the inner bag) is filled to the outer canister firstly before the canister cover is tightly buckled and sealed with the outer canister, lots of pressurized propellant gas is lost, which increases the production cost and causes pollution to the environment. 2) The sealing between the lower and upper valve bodies is not satisfactory, which would lead to leakage. SUMMARY OF THE INVENTION The present invention aims to provide a fuel container, namely an aerosol ) container of nail gun, which can be conveniently operated to fill fuel containers, and which can prevent gas leakage effectively, so as to overcome shortcomings of the prior art; the present invention also provides a filling method for the aerosol container of nail gun. To. achieve the above-mentioned object, the aerosol container of nail gun of the present invention comprises: a container body, comprised of a container cover and a cylindrical cup, the container cover is buckled on a turned-down perimeter of an upper opening of the cylindrical cup, and a central part of the container cover extends outwards to form a center-holed boss; a valve body, an upper end of the valve body is flush-mounted in the boss, a lower end of the valve body is connected to and sealed with an inner bag placed in the container body, in the valve body is disposed a venting hole which communicates with the inner bag, and an air gap is reserved between the boss and the valve body; a valve core, mounted in the valve body, a tubular valve nozzle is formed on an upper end of the valve core and extending outwards through the center-holed boss, with an upper necking section and a lower necking section made on the valve nozzle adjacent to the boss, a hole running through a side wall of the valve core is disposed in an intermediate part of the lower necking section; a sealing ring, enveloped tightly around the lower necking section, a lower surface of the sealing ring abuts against the upper end of the valve body; an elastic element, mounted between a lower end of the valve core and the valve body; 2 English Translation of PCT Publication wherein the valve core has a first (static), a second (filling) and a third (working) axial positions; when the valve core is at the first axial position under the maximum stretch of the elastic element, the upper necking section and the lower necking section of the valve nozzle are respectively located inside and outside of the boss, the upper surface and the lower surface of the sealing ring are respectively pressed against and sealed with an inner surface of the boss and the upper end of the valve body; when the valve core is at the second axial position and the elastic element is in the maximum compression state, the upper necking section of the valve nozzle is located at the opening of the boss, the upper surface of the sealing ring departs from the inner surface of the boss, thereby an airflow channel constituted by a gap located between the upper necking section of the valve nozzle and the opening of the boss, and by air gaps located between the boss and the valve body, is formed; when the valve core is at the third axial position and the elastic element is in an intermediate compression state, the sealing ring keeps sealed and contacted peripherally with the inner surface of the boss, and an interface between the sealing ring and the lower necking section of the valve nozzle is in a shape of an inwardly-facing horn, thereby a venting channel from the inner bag to the valve nozzle through the hole is formed. It is easy to understand that, when the valve core is at the first axial position (static position) under the action of the elastic element, the sealing ring can seal the air gap reliably to prevent gas leakage under the pressure of the upper end of the valve body. when it is necessary to fill pressurized propellant gas into the cavity between the container body and the inner bag, by pressing down the valve core against the force of the elastic element to put the valve core at the second axial position (filling position), the upper necking section is located at the opening of the boss so as to form a gap, and the upper surface of the sealing ring departs from the boss, thereby an airflow channel constituted by a gap located between the upper necking section of the valve nozzle and the opening of the boss, and by air gaps located between the boss and the valve body, is formed, and the external pressurized propellant gas can be filled into the cavity between the container body and the inner bag through the airflow channel. During the process of using, when the valve core is pressed down to the third axial position (working position) against the force of the elastic element, the sealing ring, at where it is enveloped tightly around the lower necking section of the valve core, departs axially at its bottom from the lower necking section and forms a certain angle therewith, thereby a venting channel from the valve nozzle to the inner bag 3 English Translation of PCT Publication through a hole is formed. Thus, flammable gas can be released from the inner bag; meanwhile, because of the sealing between the valve body and the inner surface of the boss, and because of the sealing for the air gaps at the upper end of the valve body, air leakage can be effectively prevented. A further improvement of the present invention is that, an inner circumference and an outer circumference are made on the upper end of the valve body, the inner circumference is lower in height than the outer circumference; the lower surface of the sealing ring abuts against an upper end of the inner circumference, and a margin of the sealing ring is contained in the outer circumference; venting holes are made and radially distributed at intervals on the outer circumference; when the valve core is at the first axial position (static position), the elastic element is in the maximum stretch state, the upper necking section and the lower necking section of the valve nozzle are respectively located inside and outside of the boss, the upper surface and lower surface of the sealing ring are respectively pressed against the inner surface of the boss and the upper end of the inner circumference; when the valve core is at the second axial position (filling position), the elastic element is in the maximum compression state, the upper necking section of the valve nozzle is located at the opening of the boss, the upper surface of the sealing ring departs from the inner surface of the boss, the lower surface of the sealing ring keeps pressed against the upper end of the inner circumference. Therefore, when the valve core is at the first axial position (static position) under the action of the elastic element, the sealing ring can seal the air gap more reliably to prevent gas leakage under the pressure of the upper end of the inner circumference; when the valve core is pressed down to the second axial position (filling position) against the elastic element, the upper necking section is located at the opening of the boss so as to form a gap, and the sealing ring is bent and deformed under the joint action of the lower necking section of the valve core and the inner circumference, as a result, the upper surface of the sealing ring departs from the boss, the air gap is opened, and the external pressurized air can be filled smoothly into the cavity between the container body and the inner bag. A further improvement of the present invention is that, parts of a periphery of the boss in the center of the container cover are pressed inwards, forming clubs-shaped contractions, so as to make the upper end of the valve body flush-mounted therein, and to fonn air gaps peripherally distributed at intervals between the boss and the 4 English Translation of PCT Publication valve body. Therefore, it is convenient for assembling the container cover with the valve body, the reliably fixing is ensured, and an ideal airflow channel is formed naturally which helps a smooth gas-filling. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be described in more details with reference to the accompanying drawings. Fig. 1 is a schematic view illustrating the structure of the aerosol container of nail gun according to one embodiment of the present invention; Fig. 2 is an enlarged view cut along E-E line in Fig. 1; Fig. 3 is a schematic view illustrating the structure of the aerosol container of nail gun shown in Fig. 1, wherein the aerosol container of nail gun is in the filling state; Fig. 4 is a partial enlarged view of Fig. 3; Fig. 5 is a schematic view illustrating the structure of the aerosol container of nail gun shown in Fig. 1, wherein the aerosol container of nail gun is in the working state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The First Embodiment As shown in Fig. 1, the aerosol container of nail gun of this embodiment has a container body comprised of a container cover 6 and a cylindrical cup 2, wherein the container cover 6 is buckled on the turned-down perimeter of the upper opening of the cylindrical cup 2 with sealing elements 7 filled therebetween, and the central part of the container cover extends outwards to form a center-holed boss. The hole in the center of the boss forms an outward spigot, the upper end of the tubular valve body 3 is fixedly flush-mounted in the boss with an air gap reserved therebetween. The lower end of the valve body 3 is pressed tightly to and sealed with the bottom of the valve body, in the center of the valve body 3 is disposed a venting hole which communicates with the inside of the inner bag 1, and the circumference of the valve body 3 is hot-melt and sealed with the top of the inner bag I in the container body. A valve core 5, which is mounted in the valve body 3, can be moved up and down so as to have the first, the second and the third axial positions. An elastic element 8 (a spring) is disposed between the lower end of the valve core 5 and the valve body 3. A 5 English Translation of PCT Publication tubular valve nozzle is formed on the upper end of the valve core and extending outwards through the center-holed boss, with an upper necking section C and a lower necking section D made on the valve nozzle adjacent to the boss. A hole F running through the side wall of the valve core is disposed in the intermediate part of the lower necking section, with a sealing ring 4 enveloped tightly around the lower necking section. An inner circumference B and an outer circumference A are made on the upper end of the valve body 3, wherein the inner circumference B is formed by directly extending upwards the tubular valve body 3, and the outer circumference A is formed by laterally expanding then extending upwards the upper end of the tubular valve body 3. The inner circumference B is lower in height than the outer circumference A. Venting holes E are made and radially distributed at intervals on the ) outer circumference A (see Fig. 4). The lower surface of the sealing ring 4 abuts against the upper end of the inner circumference B, and the margin of the sealing ring 4 is contained in the outer circumference A. As shown in Fig. 2, parts of the periphery of the boss in the center of the container cover 6 are pressed inwards, forming clubs-shaped contractions, so as to make the upper end of the valve body 3 flush-mounted therein, and to form air gaps peripherally distributed at intervals between the boss and the valve body, wherein each air gap communicates with a corresponding one of the venting holes E radially distributed at intervals on the outer circumference A. When the valve core 5 is at the upper and the first axial position under the maximum stretch of the elastic element 8, the upper necking section and the lower ) necking section of the valve nozzle are respectively located inside and outside of the boss, the upper surface and lower surface of the sealing ring 4 are respectively pressed against the inner surface of the boss and the upper end of the inner circumference, thereby the inside of the container body is completely isolated from the outside (see Fig. 1). When the valve core is pressed down to the second axial position and the elastic element 8 is in the maximum compression state, the upper necking section of the valve nozzle is located at the opening of the boss, the upper surface of the sealing ring 4 departs from the inner surface of the boss, thereby the outside of the container communicates with the cavity between the container body and the inner bag through the air gap, which is between the upper necking section of the valve nozzle and the opening of the boss, and through the venting holes E and the corresponding air gaps, 6 English Translation of PCT Publication which are radially distributed at intervals on the outer circumference A, and the pressurized air needed can be filled in (see Fig. 3). During the process of using, when the valve core is pressed down to the working position shown in Fig. 5 against the force of the elastic element, the sealing ring, at where it is enveloped tightly around the lower necking section of the valve nozzle, departs axially at its bottom from the lower necking section and forms a certain angle therewith, that is, the interface between the sealing ring and the lower necking section of the valve nozzle is in the shape of an inwardly-facing horn, thereby a venting channel from the valve nozzle to the inner bag through the hole F is formed. Thus, with the help of the pressurized air between the container body and the inner bag, flammable gas can be released from the inner bag; meanwhile, because of the sealing ) between the valve body and the inner surface of the boss, and because of the sealing for the air gaps at the upper end of the valve body, air leakage can be effectively prevented. It should be understood that the present invention may be implemented in other embodiments than those described above. Any equivalent substitutions or variations can be made without departing from the spirit and scope of the invention as defined in the claims. 7

Claims

1. An aerosol container of nail gun, comprising: a container body, comprised of a container cover and a cylindrical cup, the container cover is buckled on a turned-down perimeter of an upper opening of the cylindrical cup, and a central part of the container cover extends outwards to form a center-holed boss; a valve body, an upper end of the valve body is flush-mounted in the boss, a lower end of the valve body is connected to and sealed with an inner bag placed in the container body, in the valve body is disposed a venting hole which communicates with the inner bag, and an air gap is reserved between the boss and the valve body; a valve core, mounted in the valve body, a tubular valve nozzle is formed on an upper end of the valve core and extending outwards through the center-holed boss, with an upper necking section and a lower necking section made on the valve nozzle adjacent to the boss, a hole running through a side wall of the valve core is disposed in an intermediate part of the lower necking section; a sealing ring, enveloped tightly around the lower necking section, a lower surface of the sealing ring abuts against the upper end of the valve body; an elastic element, mounted between a lower end of the valve core and the valve body; wherein the valve core has a first, a second and a third axial positions; when the valve core is at the first axial position under the maximum stretch of the elastic ) element, the upper necking section and the lower necking section of the valve nozzle are respectively located inside and outside of the boss, the upper surface and the lower surface of the sealing ring are respectively pressed against and sealed with an inner surface of the boss and the upper end of the valve body; when the valve core is at the second axial position and the elastic element is in the maximum compression state, the upper necking section of the valve nozzle is located at the opening of the boss, the upper surface of the sealing ring departs from the inner surface of the boss, thereby an airflow channel constituted by a gap located between the upper necking section of the valve nozzle and the opening of the boss, and by air gaps located between the boss and the valve body, is formed; when the valve core is at the third axial position and the elastic element is in an intermediate compression state, the sealing ring keeps sealed and contacted peripherally with the inner surface of the boss, and an interface 8 Izngusn iransiation or ru i rumicanion between the sealing ring and the lower necking section of the valve nozzle is in a shape of an inwardly-facing horn, thereby a venting channel from the inner bag to the valve nozzle through the hole is formed.

2. The aerosol container of nail gun according to claim 1, characterized in that , an inner circumference and an outer circumference are made on the upper end of the valve body, the inner circumference is lower in height than the outer circumference; the lower surface of the sealing ring abuts against an upper end of the inner circumference, and a margin of the sealing ring is contained in the outer circumference; when the valve core is at the first axial position, the upper surface and lower surface of the sealing ring are respectively pressed against the inner surface of the boss and the upper end of the inner circumference; when the valve core is at the ) second axial position, the upper surface of the sealing ring departs from the inner surface of the boss, the lower surface of the sealing ring keeps pressed against the upper end of the inner circumference.

3. The aerosol container of nail gun according to claim 1 or claim 2, characterized in that, parts of a periphery of the boss in the center of the container cover are pressed inwards, forming clubs-shaped contractions, so as to make the upper end of the valve body flush-mounted therein, and to form air gaps peripherally distributed at intervals between the boss and the valve body.

4. The aerosol container of nail gun according to claim 3, characterized in that, venting holes are made and radially distributed at intervals on the outer circumference, and each of the air gaps distributed at intervals between the boss and the valve body communicates with a corresponding one of the venting holes distributed radially on the outer circumference.

5. The aerosol container of nail gun according to claim 4, characterized in that, the valve body is tubular, the inner circumference is formed by directly extending upwards the valve body, and the outer circumference is formed by laterally expanding then extending upwards the upper end of the valve body.

6. The aerosol container of nail gun according to claim 5, characterized in that, the lower end of the valve body is pressed tightly to and sealed with the bottom of the valve body, and a circumference of the valve body is hot-melt and sealed with a top of the inner bag in the container body.

7. The aerosol container of nail gun according to claim 6, characterized in that, the hole in the center of the boss fonns an outward spigot. 9 english translation of PUI Publication

8. The aerosol container of nail gun according to claim 7, characterized in that, sealing elements are filled between the container cover and the turned-down perimeter of the upper opening of the cylindrical cup.

9. A filling method for the aerosol container of nail gun as claimed in claim 1, characterized in that: when it is necessary to fill pressurized propellant gas in a cavity between the container body and the inner bag, the filling method comprises the following steps: (1) pressing down the valve core against forces of the elastic element so as to place the valve core at the second axial position; (2) positioning the upper necking section of the valve nozzle at the opening of the boss so as to form a gap, and the upper surface of the sealing ring is made to ) depart from the boss, thereby an airflow channel constituted by a gap located between the upper necking section of the valve nozzle and the opening of the boss, and by air gaps located between the boss and the valve body, is formed; (3) filling external pressurized propellant gas into the cavity between the container body and the inner bag through the airflow channel. 10