Mechanical guns and projectors – Fluid pressure – With control for discharge of fluid pressure
Reexamination Certificate
2002-03-04
2003-04-29
Jordan, Charles T. (Department: 3644)
Mechanical guns and projectors
Fluid pressure
With control for discharge of fluid pressure
C124S076000
Reexamination Certificate
active
06553983
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a paint ball gun providing an improved accuracy.
2. Description of the Related Art
FIG. 6
of the drawings illustrates a conventional paint ball gun comprising a receiver
70
with an upper compartment
71
and a lower compartment
72
parallel to the upper compartment
71
. A ball-feeding tube
73
is attached to a side of the receiver
70
. A barrel
74
is attached to a front end of the upper compartment
71
. A venturic bolt
75
is mounted in the upper compartment
71
. A gas control device
77
is mounted in the lower compartment
72
and includes front striker plug
771
, a valve body
90
, a striker
772
, and a rear striker plug
774
. A passageway
79
is provided between the upper compartment
71
and the lower compartment
72
. A connecting member
78
is provided to connect the striker
772
with the venturic bolt
75
to allow joint movement. A grip means
80
is attached to an underside of the receiver
70
and includes a trigger
81
and a grip
82
. An adaptor
83
is attached to a lower side of the grip
82
for attachment of a container containing pressurized gas or the like. The adaptor
83
is communicated with a gasifier
85
via a tube
84
.
In firing, when the trigger
81
is pulled to a firing position, gas is fed to the gasifier
85
and then enters a space between the front striker plug
771
and the valve body
90
through a reservior
86
in a front end of the lower compartment
72
. The venturic bolt
75
and the striker
772
are moved rearward and then positioned. At this time, a paint ball
94
is fed into the upper compartment
71
through the ball-feeding tube
73
and located in front of the venturic bolt
75
. When the trigger
81
is pulled further rearward, the stored energy of the striker spring
773
is released and thus moves the striker
772
to impact the valve pin
91
of the valve body
90
. Thus, the valve pin
91
moves forward and compresses the valve spring
93
between the front striker plug
771
and the valve body
90
. The pressurized gas enters the valve body
90
and then a chamber
751
in the venturic bolt pin
75
through an orifice
92
. Then, the pressurized gas impacts the paint ball
94
after passing through passageways between the wings
761
of the venturic bolt pin
76
. Thus, the paint ball
94
is fired through the barrel
74
. At the moment of firing, the trigger
81
releases the stored energy of the striker spring
773
to urge the striker
772
to impact the valve pin
91
of the valve body
90
. The valve spring
93
between the front striker plug
771
and the valve body
90
is compressed rapidly and thus releases the pressurized gas. Thus, the pressurized gas impacts the paint ball
94
and moves the striker
772
rearward for next firing.
However, flexibility of the valve spring
93
mounted between the front striker plug
771
and the valve body
90
adversely affects returning of the valve pin
91
. The gas flowing through the passageways between the wings
761
of the venturic bolt pin
76
located in the compartment
751
of the venturic bolt
75
diverts and thus could not provide a balanced impact force for firing the paint ball
94
. As a result, the accuracy of the fired paint ball
94
is adversely affected.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a paint ball gun providing an improved accuracy.
A paint ball gun in accordance with the present invention comprises:
a receiver including an upper compartment and a lower compartment parallel to the upper compartment;
a barrel attached to a front end of the upper compartment;
a ball-feeding tube attached to a side of the receiver for feeding a paint ball into the upper compartment;
a bolt slidably mounted in the upper compartment and including a chamber in a front end thereof;
a bolt pin mounted in the chamber of the bolt;
a gas control device mounted in the lower compartment and including a front striker plug, a valve assembly, a striker, a striker spring, and a rear striker plug, the bolt and the striker being connected together to move jointly;
an orifice defined between the upper compartment and the lower compartment; and
a trigger operably connected to the striker spring;
the valve assembly comprising a positioning sleeve secured in the lower compartment, a valve pin, a valve spring mounted in the positioning sleeve, a seal member, and a cap, the valve pin extending through the valve spring and located in the positioning sleeve, the valve pin including a rear end extending beyond a hole in a rear end of the positioning sleeve, the positioning sleeve including a front end to which the seal member is mounted, the valve pin including a front end extending beyond the seal member with the cap securely attached to the front end of the valve pin to move therewith;
the valve pin being actuated forward by the striker when the trigger is pulled beyond a predetermined position, the cap being moved away from the seal member to allow gas from the front striker plug to enter the positioning sleeve, a portion of the gas entering the chamber of the bolt through the orifice for firing the paint ball through the barrel, another portion of the gas exiting the hole in the rear end of the positioning sleeve to move the striker rearward.
The positioning sleeve includes an inner threading in a front end thereof and a vent in an outer periphery thereof. The front end of the valve pin includes an outer threading. The rear end of the valve pin includes a beveled section with a beveled face for providing a passageway to the vent. A stop is formed on the beveled section. The seal member includes a flange on an inner periphery of a front end thereof. The seal member further includes a threaded section on an outer periphery thereof for engaging with the inner threading of the positioning sleeve. The valve spring includes a rear end attached to the stop and a front end attached to the flange of the seal member. A washer is mounted around the front end of the valve pin and located in the cap. The cap includes an inner threading for engaging with the outer threading of the valve pin.
The bolt pin includes a first end and a reduced second end. A conic portion is formed between the first end and the reduced second end of the bolt pin. A concave face is defined in the first end of the bolt pin. The reduced second end of the bolt pin is securely engaged in the chamber of the bolt. At least one longitudinal passageway is defined between the conic portion and the concave face of the bolt pin. The paint ball is fired by the portion of the gas passing through the orifice and the longitudinal passageway.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4004566 (1977-01-01), Fischer
patent: 5063905 (1991-11-01), Farrell
patent: 5333594 (1994-08-01), Robinson
patent: 5462042 (1995-10-01), Greenwell
patent: 5967133 (1999-10-01), Gardner, Jr.
patent: 6003504 (1999-12-01), Rice et al.
patent: 6142136 (2000-11-01), Velasco
patent: 6360736 (2002-03-01), Juan
patent: 6371099 (2002-04-01), Lee
Jordan Charles T.
Rosenberg , Klein & Lee
Zerr John W.
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