Drain clearing air gun

Patent metadata

Field	Value
Publication number	US-11235360-B2
Application number	US-201916432696-A
Country	US
Kind code	B2
Filing date	Jun 5, 2019
Priority date	Nov 11, 2016
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

A drain clearing air gun includes a housing defining a main body, a handle positioned on a first end of the main body, and a nose positioned on a second end of the main body. A tank is at least partially positioned within the housing and includes a chamber for receiving pressurized air. A motor is positioned within a main body of the housing, and a pump is positioned within the main body of the housing and operatively coupled to the motor. The pump is driven by the motor to pump air into the tank. A pressure gauge is supported by the housing and includes an automatic shutoff feature. The pressure gauge is in fluid communication with the tank. When a predetermined pressure within the tank is reached the automatic shutoff feature is activated to stop the motor.

First claim

The invention claimed is:

1. A drain clearing air gun comprising:
a housing defining a main body, a handle positioned on a first end of the main body, and a nose positioned on a second end of the main body;
a tank at least partially positioned within the housing and including a chamber for receiving pressurized air;
a motor positioned within the main body of the housing;
a pump positioned within the main body of the housing and operatively coupled to the motor, the pump being driven by the motor to pump air into the tank; and
a pressure gauge supported by the housing and including an automatic shutoff feature, the pressure gauge being in fluid communication with the tank, wherein when a predetermined pressure within the tank is reached the automatic shutoff feature is activated to stop the motor.

2. The drain clearing air gun of claim 1 , wherein the pressure gauge is supported on the handle.

3. The drain clearing air gun of claim 1 , wherein the predetermined pressure is a desired maximum pressure set by a user.

4. The drain clearing air gun of claim 3 , wherein the pressure gauge includes:
a faceplate with tick marks representing various pressures,
a needle movably coupled to the faceplate for indicating a current pressure measured by the pressure gauge, the needle being composed of an electrically conductive material,
a bezel rotatably coupled to the faceplate for movement relative to the faceplate, and
an electrical contact coupled to the bezel for movement with the bezel relative to the faceplate to set the desired maximum pressure, wherein when the needle contacts the electrical contact, the motor is shut off.

5. The drain clearing air gun of claim 1 , wherein the motor is also configured to shut off if the motor has been running for more than a predetermined time period.

6. The drain clearing air gun of claim 1 , wherein the motor is also configured to shut off if a current draw of the motor rises above a predetermined current level.

7. The drain clearing air gun of claim 1 , further comprising a pilot valve disposed within the tank, wherein the pilot valve is operable to selectively release pressurized air from the chamber of the tank.

8. A drain clearing air gun comprising:
a housing defining a main body, a handle positioned on a first end of the main body, and a nose positioned on a second end of the main body;
a tank at least partially positioned within the housing and including a chamber for receiving pressurized air;
a motor positioned within the main body of the housing;
a pump positioned within the main body of the housing and operatively coupled to the motor, the pump being driven by the motor to pump air into the tank; and
a pressure gauge supported by the housing, the pressure gauge fluidly coupled to the tank and electrically coupled to the motor, the pressure gauge including
a faceplate,
an indicator movably coupled to the faceplate for indicating the current pressure measured by the pressure gauge, the indicator being composed of an electrically conductive material,
a bezel rotatably coupled to the faceplate for movement relative to the faceplate, and
an electrical contact coupled to the bezel for movement with the bezel relative to the faceplate, wherein when the indicator contacts the electrical contact, the motor is shut off.

9. The drain clearing air gun of claim 8 , wherein the faceplate includes tick marks representing various pressures.

10. The drain clearing air gun of claim 8 , wherein the indicator is a needle rotatably coupled to the faceplate.

11. The drain clearing air gun of claim 8 , wherein the bezel concentrically surrounds the faceplate and includes a bezel indicator.

12. The drain clearing air gun of claim 11 , wherein the electrical contact is aligned with the bezel indicator.

13. The drain clearing air gun of claim 8 , wherein the bezel is rotatable relative to the faceplate to align the electrical contact with a desired maximum pressure, and when the indicator reaches the desired maximum pressure, the indicator engages the electrical contact to shut off the motor.

14. The drain clearing air gun of claim 13 , wherein the pressure gauge includes a noise filtration feature such that the indicator engages the electrical contact a predetermined number of times prior to the motor shutting off.

15. A drain clearing air gun comprising:
a housing defining a main body, a handle positioned on a first end of the main body, and a nose positioned on a second end of the main body, the housing also including a battery receptacle;
a tank at least partially positioned within the housing and including a chamber for receiving pressurized air;
a motor positioned within the main body of the housing;
a pump positioned within the main body of the housing and operatively coupled to the motor, the pump being driven by the motor to pump air into the tank; and
a battery pack received within the battery receptacle, the battery pack being electrically coupled to the motor to selectively energize the motor.

16. The drain clearing air gun of claim 15 , wherein the battery receptacle is coupled to the handle.

17. The drain clearing air gun of claim 15 , further comprising:
a first actuator supported by the housing and operable to start building up pressurized air inside the tank; and
a second actuator supported by the housing and operable to release pressurized air from the tank into a drain.

18. The drain clearing air gun of claim 17 , wherein the handle includes a grip that supports the first actuator and the second actuator.

19. The drain clearing air gun of claim 17 , further comprising a pilot valve disposed within the tank and coupled to the second actuator, wherein the pilot valve is operable to selectively release pressurized air from the chamber of the tank.

20. The drain clearing air gun of claim 19 , wherein the second actuator is mechanically coupled to the pilot valve and does not require any power from the battery pack to operate the pilot valve and release the air pressure in the tank.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Kehoe Sean T
• Denissen Ryan J
• Reed Michael C
• Zhmendak Vasil
• Krohlow Samuel J
• Liang Jingyuan

Classifications

• B05B1/005

  Nozzles or other outlets specially adapted for discharging one or more gases · CPC title

• B08B9/0328 Primary

  by purging the pipe with a gas or a mixture of gas and liquid · CPC title

• E03C1/308

  by means of a pumping device · CPC title

• B08B5/02

  Cleaning by the force of jets, e.g. blowing-out cavities {(airguns or nozzles per se B05B1/005)} · CPC title

• B05B12/008

  integrated in or attached to a discharge apparatus, e.g. a spray gun · CPC title