Pneumatic dispensing gun

A pneumatic dispensing gun includes a receptacle having a conduit for receiving a pressurized gas, a cartridge supported on the receptacle, an end cap attached to the cartridge and having a path communicating with the conduit of the receptacle, and a regulating device attached to the end cap for regulating the pressurized gas or for allowing pressurized gas supplied to the dispensing gun to be released when required, and for preventing the pressurized gas supplied to the dispensing gun from being over pressurized, and thus for suitably and adjustably dispensing the flowable material from the cartridge.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a pneumatic dispensing gun, and more particularly to a pneumatic dispensing gun including an adjusting or pressure regulating device for regulating the pneumatic pressure and for suitably or adjustably dispensing the flowable materials from the prefilled packages or cartridges.

2. Description of the Prior Art

Typical dispensing guns or caulk guns or extrusion devices comprise a C-shaped frame or a receptacle attached to a gun body for receiving a prefilled package or cartridge therein, and a push rod engageable into the prefilled package or cartridge, and an actuating or driving handle coupled to the push rod for applying a force to dispense or to distribute the flowable materials from the prefilled packages or cartridges.

For example, U.S. Pat. No. 5,156,305 to Eyre, and U.S. Pat. No. 5,626,263 to Lii disclose two of the typical caulk dispensing guns or C-clamp assemblies and each also including a receptacle or cartridge keep attached to or extended from a gun body or stock for receiving a prefilled package or cartridge therein, and an actuating or driving handle coupled to a push rod which is engageable into the prefilled package or cartridge for forcing the push rod to dispense or to distribute the flowable materials from the prefilled packages or cartridges.

However, the users have to spend a great force to pull or to trigger the actuating or driving handle in order to dispense or to distribute the flowable materials from the prefilled packages or cartridges, such that the typical caulk dispensing guns are not good for long term working people.

U.S. Pat. No. 5,058,769 to Kurtz discloses another typical pneumatic caulk dispensing gun including a gun body member for receiving a prefilled package or cartridge therein, and a connector for coupling to a pressurized air supplier reservoir or a pressurized gas source for receiving the pressurized air or gas and for forcing or dispensing or distributing the flowable materials from the prefilled packages or cartridges.

However, the pressurized gas supplied from the pressurized air supplier reservoir or gas source may not be regulated or adjusted particularly when the pressurized air or gas is over-pressurized or when the pressurized air or gas is not stable or steady.

The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional dispensing guns or devices for dispensing or distributing the flowable materials from the prefilled packages or cartridges.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a pneumatic dispensing gun including an adjusting or pressure regulating device for regulating the pneumatic pressure or for allowing pressurized gas supplied to the dispensing gun to be released when required, and for preventing the pressurized air or gas supplied to the dispensing gun from being over pressurized, and for suitably or adjustably dispensing the flowable materials from the prefilled packages or cartridges.

In accordance with one aspect of the invention, there is provided a pneumatic dispensing gun comprising a receptacle including a conduit formed therein for receiving a pressurized gas, a cartridge supported on the receptacle and including one end portion, an end cap attached to the one end portion of the cartridge, and including a path formed therein for communicating with the conduit of the receptacle and for communicating with the one end portion of the cartridge and for supplying the pressurized gas into the cartridge, and a regulating device attached to the end cap for regulating the pressurized gas.

The regulating device includes a valve device resiliently engaged with the end cap and for selectively blocking the path of the end cap. The end cap includes a compartment formed in a rear portion of the end cap and communicating with the path of the end cap, and the valve device is slidably disposed and engaged in the compartment of the end cap.

The valve device includes a casing and a frustum-shaped skirt extended from the casing for resiliently engaging with the end cap. The valve device includes a recess formed in the casing and facing toward the path of the end cap.

The valve device includes a spring biasing device for biasing the valve device to resiliently engage with the end cap. A coupler is further provided and attached to the valve device, and the spring biasing device includes a spring member engaged with the coupler for biasing the valve device to resiliently engage with the end cap.

The valve device includes a control ferrule attached to the end cap and having a chamber formed in the control ferrule, and an anchor disposed in the chamber of the control ferrule and engaged with the spring member. The anchor includes a cavity formed therein for receiving the spring member.

The coupler includes an extension extended therefrom for engaging with the spring member and for anchoring the spring member. The valve device includes a casing, and the coupler includes a depression formed by a peripheral wall for receiving the casing and for anchoring the coupler to the valve device.

The control ferrule includes a peripheral flap extended radially and inwardly for forming an opening in the peripheral flap of the control ferrule, and the anchor includes a protrusion extended therefrom and engaged through the opening of the control ferrule for anchoring the anchor to the control ferrule.

The peripheral flap of the control ferrule includes a number of orifices formed therein, and arranged around the opening of the peripheral flap for air circulating purposes. The control ferrule is adjustably attached to the end cap.

A connector is further provided and attached to the end cap, and a tube includes a first end secured to the receptacle and a second end slidably and adjustably engaged with the connector, and the tube includes a bore formed therein and communicating with the conduit of the receptacle.

The connector includes a first segment attached to the end cap, and a second segment, and includes a pathway formed in the first segment and the second segment, the second end of the tube is slidably and adjustably engaged in the pathway of the connector.

The receptacle includes a handle extended from the receptacle and having a passage formed in the handle and communicating with the conduit of the receptacle.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to the drawings, and initially toFIGS. 1-3, a pneumatic dispensing gun1in accordance with the present invention comprises a gun body or frame or receptacle10including a space or chamber11formed therein, such as formed in the upper portion thereof for receiving a prefilled package or cartridge18therein, and a C-ring or retaining device12attached to the receptacle10and engageable with the prefilled package or cartridge18for stably coupling or retaining the prefilled package or cartridge18to the receptacle10, and for preventing the prefilled package or cartridge18from being disengaged from the receptacle10, the receptacle10include an air or gas or fluid conduit13formed therein, such as formed in the lower portion thereof and located below the chamber11of the receptacle10and/or the prefilled package or cartridge18.

The receptacle10further includes a handle14extended downwardly from the gun body or receptacle10and having an air or gas or fluid passage15formed in the handle14and intersecting or communicating with the conduit13of the receptacle10, and includes a port or mouth16attached to the handle14for coupling to a pressurized air supplier reservoir or a pressurized gas source (not shown) and for receiving the pressurized air or gas from the pressurized gas source and also for supplying the pressurized air or gas to the passage15of the handle14and the conduit13of the receptacle10. A control device or trigger17is slidably attached to the handle14and/or to the receptacle10, and arranged or disposed between the passage15of the handle14and the conduit13of the receptacle10for triggering or controlling the pressurized air or gas to flow from the passage15of the handle14to the conduit13of the receptacle10.

An end cap20is attached to or engaged with the one end or rear portion19of the cartridge18and secured to the rear portion19of the cartridge18with such as fasteners or latches (not shown), or a lock ferrule21, and includes a T-shaped air or gas or fluid path22formed therein and communicating with the rear portion19of the cartridge18for supplying the pressurized air or gas into the cartridge18, and includes a port23formed therein and communicating with the path22of the end cap20, an L-shaped elbow or connector30includes two segments31,32having one of the segments31coupled or engaged with the port23of the end cap20, and includes an L-shaped pathway33formed therein and communicating with the path22of the end cap20, and for communicating with the conduit13of the receptacle10and thus the passage15of the handle14.

A tube34includes one end35threaded or secured to the receptacle10, and another end36slidably or adjustably received or engaged within the pathway33of the other segment32of the connector30, and includes a sealing ring37engaged onto the outer peripheral portion of the other end36of the tube34for making a water tight seal or an air tight seal between the other segment32of the connector30and the tube34and for allowing the other end36of the tube34to be slid or moved or adjusted relative to the other segment32of the connector30. The tube34includes a bore38formed therein and communicating with the pathway33of the connector30and also communicating with the conduit13of the receptacle10and thus the passage15of the handle14, and thus for allowing the pressurized air or gas to be supplied from the passage15and the mouth16of the handle14to the conduit13of the receptacle10and then to the pathway33of the connector30and also to the path22of the end cap20.

The end cap20further includes a compartment24formed in the rear portion25of the end cap20and opened or facing rearwardly, and includes an outer thread26formed on the outer peripheral portion of the rear portion25of the end cap20for attaching an adjusting or pressure regulating device40which is provided for regulating the pneumatic pressure or air or gas pressure and for suitably or adjustably dispensing the flowable materials from the prefilled packages or cartridges18. For example, the regulating device40includes a control ferrule41threaded or secured to the rear portion25of the end cap20with such as the threading engagement or the outer thread26of the end cap20, and includes a chamber42formed in the control ferrule41, the control ferrule41includes a peripheral flap43extended radially and inwardly from the rear portion of the control ferrule41for forming or defining an opening44in the peripheral flap43or in the control ferrule41.

It is preferable that the control ferrule41further includes a number of orifices45formed therein, such as formed in the peripheral flap43preferably arranged or located around the opening44of the peripheral flap43for air circulating purposes. An anchor46is disposed or received or engaged within the chamber42of the control ferrule41, and includes an outer diameter smaller than an inner diameter of the chamber42of the control ferrule41for allowing the pressurized air or gas to bypass the anchor46and to flow out through the opening44and/or the orifices45of the peripheral flap43(FIG. 5). The anchor46includes a protrusion47extended outwardly therefrom and engaged through the opening44of the control ferrule41for anchoring or positioning the anchor46to the control ferrule41and for preventing the anchor46from being disengaged from the control ferrule41. The anchor46includes a cavity48formed therein or formed in the protrusion47for receiving a spring biasing means or member49.

A valve device50includes a U or C-shaped casing51slidably disposed or received or engaged within the compartment24of the end cap20and having a recess52formed therein and opened or facing toward the path22of the end cap20, and includes a cone-shaped or inclined or frustum-shaped skirt53provided or extended outwardly therefrom for resiliently engaging with the rear portion25of the end cap20and for selectively blocking or enclosing the compartment24and/or the path22of the end cap20, a coupler55includes a depression56formed in one end or the front portion thereof and formed or defined by a peripheral wall57for receiving the casing51of the valve device50and for anchoring or positioning or attaching the coupler55to the valve device50, and the coupler55includes an extension58extended outwardly therefrom for engaging with the spring member49and for stably anchoring or positioning the spring member49between the coupler55and the anchor46and the control ferrule41.

In operation, as shown inFIGS. 3, and4, the spring member49may bias and force the valve device50toward the end cap20, and may bias and force the skirt53of the valve device50to resiliently engage with the rear portion25of the end cap20and to selectively block or close the compartment24and/or the path22of the end cap20, and thus to prevent the pressurized air or gas to flow out through the opening44and/or the orifices45of the peripheral flap43of the control ferrule41. The control ferrule41may be threaded and moved toward and away from or relative to the rear portion25of the end cap20for adjusting the spring biasing force of the spring member49against the coupler55and the valve device50, and thus for adjusting the pressurized air or gas that may be allowed to flow out through the opening44and/or the orifices45of the peripheral flap43of the control ferrule41(FIG. 5).

In operation, as shown inFIG. 5, when the pressurized air or gas supplied from the passage15and the mouth16of the handle14to the conduit13of the receptacle10and then to the pathway33of the connector30and also to the path22of the end cap20is over pressurized, the excessive pressurized air or gas may force the skirt53of the valve device50away from the rear portion25of the end cap20and thus to selectively open the compartment24and/or the path22of the end cap20, and thus to allow the pressurized air or gas to flow out through the opening44and/or the orifices45of the peripheral flap43of the control ferrule41, such that the pressure of the pressurized air or gas may be adjusted or regulated.

Accordingly, the pneumatic dispensing gun in accordance with the present invention includes an adjusting or pressure regulating device for regulating the pneumatic pressure and for suitably or adjustably dispensing the flowable materials from the prefilled packages or cartridges.