U.S. patent application number 14/224797 was filed with the patent office on 2015-10-01 for barrel assembly for a rivet gun.
The applicant listed for this patent is Yu-Tang LIN. Invention is credited to Yu-Tang LIN.
Application Number | 20150273569 14/224797 |
Document ID | / |
Family ID | 54189017 |
Filed Date | 2015-10-01 |
United States Patent
Application |
20150273569 |
Kind Code |
A1 |
LIN; Yu-Tang |
October 1, 2015 |
BARREL ASSEMBLY FOR A RIVET GUN
Abstract
A barrel assembly for a rivet gun has a tube body, a vising
piston and a rear valve. The tube body has an assembling hole and a
bypass hole. The vising piston is mounted slidably in the
assembling hole of the tube body and has a piston head mounted
slidably in the assembling hole of the tube body and having two
O-rings mounted around the piston head at an interval, and a shaft
formed on the piston head. The rear valve mounted on the rear
opening of the assembling hole of the tube body. When the vi sing
piston moves backward adjacent to the rear opening of the
assembling hole of the tube body, the bypass hole of the tube body
is located at the interval between the O-rings and is sealed by the
0-rings without consuming high pressure air from a pneumatic
cylinder.
Inventors: |
LIN; Yu-Tang; (New Taipei
City, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LIN; Yu-Tang |
New Taipei City |
|
TW |
|
|
Family ID: |
54189017 |
Appl. No.: |
14/224797 |
Filed: |
March 25, 2014 |
Current U.S.
Class: |
29/243.54 |
Current CPC
Class: |
B21J 15/22 20130101;
Y10T 29/53774 20150115; B21J 15/043 20130101; B21J 15/105
20130101 |
International
Class: |
B21J 15/30 20060101
B21J015/30; B21J 15/10 20060101 B21J015/10 |
Claims
1. A barrel assembly for a rivet gun comprising: tube body having
an assembling hole defined longitudinally through the tube body and
h a front opening and a rear opening; and a bypass hole defined
transversely through the tube body and communicating with the
assembling hole; a vising piston mounted slidably in the assembling
hole of the tube body and having a piston head mounted slidably in
the assembling hole of the tube body, hermitically contacting an
inner surface of the assembling hole and having two O-rings mounted
around the piston head at an interval and hermetically contacting
the inner surface of the assembling hole; and a shaft formed on and
protruding longitudinally from a front end of the piston head; a
rear valve mounted on the rear opening of the assembling hole of
the tube body; wherein when the vising piston moves backward
adjacent to the rear opening of the assembling hole of the tube
body, the bypass hole of the tube body is located at the interval
between the O-rings and is sealed by the 0-rings without
communicating with the front opening or the rear opening of the
tube body.
2. The barrel assembly as claimed in claim 1, wherein a spring is
mounted in the assembling hole of the tube body and has a front end
pressing against the piston head and a rear end pressing against
the rear valve.
3. The barrel assembly as claimed in claim 2, wherein a tool head
is mounted on the front opening of the assembling hole of the tube
body and has a vise assembly mounted in the tool head and connected
to the vising piston.
4. The barrel assembly as claimed in claim 3, wherein a connecting
tube is mounted securely on a rear end of the piston head.
5. The barrel assembly as claimed in claim 4, wherein the vising
piston further has a through hole defined longitudinally through
the piston head and the shaft; and the connecting tube has a
central hole defined longitudinally through the connecting tube and
communicating with the through hole of the vising piston.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a barrel assembly, and more
particularly to a barrel assembly for a rivet gun that prevents
pneumatic cylinder from outputting high pressure air after an
operation of pulling a rivet is completed, which reduces high
pressure air consumption.
[0003] 2. Description of Related Art
[0004] A conventional rivet gun is used to rivet two boards such
that the boards are securely mounted together by rivets. A rivet
has a cap and a core pin. The cap is T-shaped and has an enlarged
end and a mounting end. The core pin is mounted longitudinally
through and protrudes out of the cap and has two ends and a ball
formed on one end and adjacent to the mounting end of the cap.
[0005] A conventional rivet gun comprises a barrel, a handle, a
trigger, a pin collector and a pneumatic cylinder.
[0006] The barrel has a front end, a rear end and a vise assembly
that may vise and pull a core pin of a rivet on the front end into
the barrel. The handle is mounted perpendicularly on the barrel and
has air passageways. The collector is a jar mounted on the rear end
of the barrel to collect the ejected core pins. The pneumatic
cylinder is mounted movably under the handle and capable of
activating the vise assembly through pneumatic and hydraulic means.
Furthermore, the pneumatic cylinder may be connected to a
high-pressure air source such as an air bottle to implement the
ejection of the core pin.
[0007] When the rivet gun is used to rivet two pieces such as
boards or plates together, a rivet is mounted through the pieces.
The enlarged end of the cap of the rivet abuts an inside piece, and
the front end of the barrel of the rivet gun abuts the enlarged
end. The trigger is pulled to activate the vise assembly to pull a
core pin on the cap into the barrel. The ball on the core pin
longitudinally compresses and radially expands the mounting end of
the cap into T-shape so that the expanded mounting end hooks on an
outside piece to complete the riveting process. Then, the air
output by the high-pressure air source flows through the barrel
from the front end to the rear end and sucks the broken core pin
vised by the vise assembly backward into the collector.
[0008] Furthermore, a bypass hole is defined through the barrel and
communicates with the air passageways. Therefore, when the trigger
is pulled, the high pressure air in the pneumatic cylinder passes
through air passageways and the bypass hole into the barrel and
drives the vise assembly to move backward to pull the rivet.
However, after the vise assembly completes the action of pulling
the rivet and stays at a back position, the pneumatic cylinder
continues outputting high pressure air through the bypass hole to
external atmosphere, which meaninglessly consumes the high pressure
air.
[0009] To overcome the shortcomings, the present invention provides
a barrel assembly for a rivet gun to mitigate or obviate the
aforementioned problems.
SUMMARY OF THE INVENTION
[0010] The main objective of the invention is to provide a barrel
assembly for a rivet gun that prevents pneumatic cylinder from
outputting high pressure air after an operation of pulling a rivet
is completed, which reduces high pressure air consumption.
[0011] A barrel assembly for a rivet gun in accordance with the
present invention has a tube body, a vising piston and a rear
valve. The tube body has an assembling hole and a bypass hole. The
vising piston is mounted slidably in the assembling hole of the
tube body and has a piston head mounted slidably in the assembling
hole of the tube body and having two O-rings mounted around the
piston head at an interval, and a shaft formed on the piston head.
The rear valve mounted on the rear opening of the assembling hole
of the tube body. When the vising piston moves backward adjacent to
the rear opening of the assembling hole of the tube body, the
bypass hole of the tube body is located at the interval between the
O-rings and is sealed by the 0-rings without consuming high
pressure air from a pneumatic cylinder.
[0012] Other objectives, advantages and novel features of the
invention will become more apparent from the following detailed
description when taken in conjunction with the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1 is a perspective view of a barrel assembly in
accordance with the present invention assembled into a rivet
gun;
[0014] FIG. 2 is a cross sectional side view of the rivet gun with
the barrel assembly in FIG. 1;
[0015] FIG. 3 is a perspective view of the barrel assembly in FIG.
1;
[0016] FIG. 4 is another perspective view of the barrel assembly in
FIG. 3;
[0017] FIG. 5 is an exploded perspective view of the barrel
assembly in FIG. 1;
[0018] FIG. 6 is another exploded perspective view of the barrel
assembly in FIG. 5;
[0019] FIG. 7 is a cross sectional side view of the barrel assembly
in FIG. 3; and
[0020] FIG. 8 is an operational cross sectional side view of the
barrel assembly in FIG. 7.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0021] With reference to FIGS. 1 and 2, a barrel assembly 10 in
accordance with the present invention may be assembled with a
handle 40 and a pneumatic cylinder 50 into a complete rivet gun.
The handle 40 has a mounting slot 400 and trigger 41 for driving
the rivet gun to pull a rivet. The pneumatic cylinder 50 may be
connected to a high pressure source to output high pressure air
into the barrel assembly 10.
[0022] With further reference FIGS. 3 to 6, the barrel assembly 10
may be mounted on the mounting slot 400 of the handle 40 and
comprises a tube body 11, a vising piston 12, a spring 13, a
connecting tube 14 and may further have a tool head 20 and a rear
valve 30.
[0023] With further reference to FIGS. 7 and 8, the tube body 11
has an assembling hole 110, a bypass hole 111 and a sleeve 15. The
assembling hole 110 is defined longitudinally through the tube body
11 and has a front opening 1101 and a rear opening 1102. The bypass
hole 111 is defined transversely through the tube body 11 and
communicates with the assembling hole 110. The sleeve 15 is formed
under the tube body 11 and may be connected to the handle 40.
[0024] The vising piston 12 is mounted slidably in the assembling
hole 110 of the tube body 11 and has a piston head 121, a shaft 125
and a through hole 120. The piston head 121 is mounted slidably in
the assembling hole 110 of the tube body 11, hermitically contacts
an inner surface of the assembling hole 110, has two O-rings 123,
124 and may further have two sealing rings 126, 127. The O-rings
123, 124 are mounted around the piston head 121 at an interval 122
and hermetically contact the inner surface of the assembling hole
110. The sealing rings 126, 127 are mounted around the piston head
121, hermetically contact the inner surface of the assembling hole
110, and seal and prevent the bypass hole 111 locating between the
O-rings 123, 124 from communicating with external atmosphere. The
shaft 125 is formed on and protrudes longitudinally from a front
end of the piston head 121. The through hole 120 is defined
longitudinally through the piston head 121 and the shaft 125.
[0025] The spring 13 is mounted in the assembling hole 110 of the
tube body 11 and has a front end and a rear end. The front end
presses against the piston head 121.
[0026] The connecting tube 14 is mounted securely on a rear end of
the piston head 121 and has a central hole 141 defined
longitudinally through the connecting tube and communicating with
the through hole 120 of the vising piston 12.
[0027] The tool head 20 is mounted on the front opening 1101 of the
assembling hole 110 of the tube body 11 and has a vise assembly
mounted in the tool head 20 and connected to the vising piston 12.
The vise assembly is capable of vising and pulling a section of a
rivet into the rivet gun.
[0028] The rear valve 30 is mounted on the rear opening 1102 of the
assembling hole 110 of the tube body 11, presses against the rear
end of the spring 13 and has multiple components assembled
together. Furthermore, the rear valve 30 slidably receives a rear
end of the connecting tube 14.
[0029] When a user pulls the trigger 41 of the rivet gun, the
vising piston 12 moves backward to pull a part of a rivet. The
pneumatic cylinder 50 continuously outputs high pressures air into
the barrel assembly 10 during a rivet-pulling stroke to eject a
broken part of the rivet. When the vising piston 12 completely
moves backward adjacent to the rear opening 1102 of the assembling
hole 110 of the tube body 11 to a rivet-pulling position, as shown
in FIG. 8, the bypass hole 111 of the tube body 11 is located at
the interval 122 between the O-rings 123, 124 and is therefore
sealed by the O-rings 123, 124 without communicating with the front
opening 1101 or the rear opening 1102 of the tube body 11. Under
such sealed condition of the bypass hole 111, the high pressure air
in the pneumatic cylinder 50 would not pass through the bypass hole
111 out of the rivet gun to external atmosphere. Therefore, the
design of sealing the bypass hole 111 by two 0-rings 123, 124
reduces high pressure consumption. Furthermore, the sealed high
pressure air also help resetting and moving the vising piston 12
forward during a resetting stroke while the compressed spring 13
mainly provides a resetting force to the vising piston 12.
[0030] Even though numerous characteristics and advantages of the
present invention have been set forth in the foregoing description,
together with details of the structure and function of the
invention, the disclosure is illustrative only. Changes may be made
in the details, especially in matters of shape, size, and
arrangement of parts within the principles of the invention to the
full extent indicated by the broad general meaning of the terms in
which the appended claims are expressed.
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