US 9,248,494 B2Granted

Rivet gun having buffer device

OwnerYu-Tang Lininventor

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Abstract

The rivet gun has a barrel, a handle, an inflator, a piston assembly and at least one buffer device. The piston assembly has a piston rod and a piston head. The at least one buffer device is mounted in the piston head and has a housing, a valve stem and a buffer spring. The housing has an inserting hole and a side hole communicating with the inserting hole. The inserting hole has a valve opening. The valve stem is movably mounted in the valve opening. A valve part is formed on a lower end of the valve stem to selectively close the valve opening. The buffer spring is mounted around the valve stem. When the piston head moves upward, the buffer spring absorbs some momentum produced by the high pressure gas to mitigate shake caused by the high pressure gas directly hitting the piston head.

Claims14

Dependent claims

A rivet gun comprising:

a barrel having a rivet assembly mounted in the barrel;
a handle extending downwards from the barrel and having a trigger assembly to actuate the rivet assembly and having
an accommodating space formed in the handle;
and
a hydraulic pipe mounted in the accommodating space and having a hydraulic channel formed in the hydraulic pipe;
an inflator mounted on a lower end of the hydraulic pipe and having an air chamber formed in the inflator:
a piston assembly mounted in the inflator, and having
a piston rod movably mounted in the hydraulic channel of the hydraulic pipe;
and
a piston head being disk-shaped, mounted on a lower end of the piston rod, contacting an inner wall of the air chamber of the inflator in an air tight manner, dividing the air chamber into an upper space and a lower space and having at least one combining hole formed through the piston head;
at least one buffer device mounted in a corresponding combining hole of the piston assembly and having
a housing having
an inserting hole axially formed through the housing and having a valve opening;
and
at least one side hole radially formed through the housing and communicating with the inserting hole;
a valve stem movably mounted in the inserting hole and having a valve part formed radially and outwards from a lower end of the valve stem to selectively close the valve opening;
and
a buffer spring mounted around the valve stem and having two ends, one end of the buffer spring abutting an inner wall of the inserting hole and the other end abutting the valve part to open the valve opening in a default state of the rivet gun;
and
wherein when the lower space is filled with high pressure gas, the piston head moves upward in the air chamber, the high pressure gas pushes the valve stem of the at least one buffer device upward and presses against the buffer spring to close the valve opening of the housing by the valve part;
when the piston head moves downward in the air chamber, the valve stem of the at least one buffer device also moves downward to open the valve opening of the housing by the valve part and release the buffer spring, and further makes the upper space and the lower space communicate with each other.

18 more elements

Dependencies are inferred from the claim text.

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Abstract

A rivet gun comprising:

a barrel having a rivet assembly mounted in the barrel;
a handle extending downwards from the barrel and having a trigger assembly to actuate the rivet assembly and having
an accommodating space formed in the handle;
and
a hydraulic pipe mounted in the accommodating space and having a hydraulic channel formed in the hydraulic pipe;
an inflator mounted on a lower end of the hydraulic pipe and having an air chamber formed in the inflator:
a piston assembly mounted in the inflator, and having
a piston rod movably mounted in the hydraulic channel of the hydraulic pipe;
and
a piston head being disk-shaped, mounted on a lower end of the piston rod, contacting an inner wall of the air chamber of the inflator in an air tight manner, dividing the air chamber into an upper space and a lower space and having at least one combining hole formed through the piston head;
at least one buffer device mounted in a corresponding combining hole of the piston assembly and having
a housing having
an inserting hole axially formed through the housing and having a valve opening;
and
at least one side hole radially formed through the housing and communicating with the inserting hole;
a valve stem movably mounted in the inserting hole and having a valve part formed radially and outwards from a lower end of the valve stem to selectively close the valve opening;
and
a buffer spring mounted around the valve stem and having two ends, one end of the buffer spring abutting an inner wall of the inserting hole and the other end abutting the valve part to open the valve opening in a default state of the rivet gun;
and
wherein when the lower space is filled with high pressure gas, the piston head moves upward in the air chamber, the high pressure gas pushes the valve stem of the at least one buffer device upward and presses against the buffer spring to close the valve opening of the housing by the valve part;
when the piston head moves downward in the air chamber, the valve stem of the at least one buffer device also moves downward to open the valve opening of the housing by the valve part and release the buffer spring, and further makes the upper space and the lower space communicate with each other.

18 more elements