U.S. patent application number 11/756654 was filed with the patent office on 2007-12-06 for gun for firing balls using lower gas pressure.
This patent application is currently assigned to M.N.K. TOOL INC.. Invention is credited to Kalvinder Singh Bhogal.
Application Number | 20070277798 11/756654 |
Document ID | / |
Family ID | 38788669 |
Filed Date | 2007-12-06 |
United States Patent
Application |
20070277798 |
Kind Code |
A1 |
Bhogal; Kalvinder Singh |
December 6, 2007 |
GUN FOR FIRING BALLS USING LOWER GAS PRESSURE
Abstract
A gas-powered gun for firing balls has a bolt slidable within a
breech section to advance a ball to a firing position. A hammer is
slidable in a first chamber formed in the gun body and a coil
spring biases the hammer to a forward position for firing the gun.
A sear member is movably mounted in the gun body and can hold the
hammer in a rear, cocked position until the trigger is pulled. The
gun has a pressurized gas circuit which includes a regulator
capable of providing gas at a pressure not exceeding 300 psi. A
second chamber formed in the gun body has an inlet connected to the
regulator. A gas valve includes a valve body fixably mounted in the
gun body between the first and second chambers. A valve stem is
slidably mounted in a central passage of the valve body. The valve
includes an elongate valve guide connected to the valve stem and
having a valve seal mounted on a seat section formed on a rear end
of the valve guide. The seat section with the seal has an external
first diameter greater than a second diameter, the latter being the
diameter of an elongate section of the guide member. A guide
arrangement holds the valve guide and guides movement thereof in a
lengthwise direction. A second spring biases the valve guide and
valve seal towards a rearward, valve closing position and the guide
and seal are located in the second chamber.
Inventors: |
Bhogal; Kalvinder Singh;
(Mississauga, CA) |
Correspondence
Address: |
GIFFORD, KRASS, SPRINKLE,ANDERSON & CITKOWSKI, P.C
PO BOX 7021
TROY
MI
48007-7021
US
|
Assignee: |
M.N.K. TOOL INC.
Mississauga
CA
|
Family ID: |
38788669 |
Appl. No.: |
11/756654 |
Filed: |
June 1, 2007 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60810146 |
Jun 2, 2006 |
|
|
|
Current U.S.
Class: |
124/74 ;
124/73 |
Current CPC
Class: |
F41B 11/723 20130101;
F41B 11/724 20130101 |
Class at
Publication: |
124/074 ;
124/073 |
International
Class: |
F41B 11/00 20060101
F41B011/00 |
Claims
1. A gas-powered gun for firing balls dispensed from a magazine
into such gun, said gun being adapted to be connected to a source
of pressurized gas, and said gun comprising: a gun body including a
gun handle and a breech section capable of receiving one ball at a
time from said magazine; a barrel connected to a front end of said
breech section; a bolt slidable within said breech section to
advance a ball to a firing position and close off a ball feed port
in said breech section; a hammer slidable in a first chamber formed
in said gun body; means for biasing said hammer to a forward
position for firing said gun; a trigger movably mounted on said gun
body; a sear mechanism including a sear member movably mounted in
said gun body and adapted to hold said hammer in a rear, cocked
position thereof until said trigger is pulled, whereby when said
trigger is pulled, said sear member is disengaged from said hammer
and permits said hammer to move to said forward position; and a
pressurized gas circuit for delivering pressurized gas from said
source to said barrel of said gun for propelling one ball at a time
therefrom, said gas circuit including a gas pressure regulator
capable of providing gas to said gas circuit at a pressure not
exceeding 300 psi, a second chamber for pressurized gas formed in
said gun body and having a gas inlet operatively connected to a gas
outlet of said regulator, a pressurized gas valve including a valve
body fixedly mounted in said gun body at a front of said first
chamber and at a rear end of said second chamber, a valve stem
mounted for sliding movement in a central passage of said valve
body, a movable, elongate yalve guide connected to a front section
of the valve stem and having a valve seal mounted on a seat section
formed on a rear end of the valve guide, said seat section with the
seal having an external first diameter greater than a second
diameter, the latter being the diameter of an elongate section of
said guide, a guide arrangement for holding said valve guide and
guiding movement thereof in a lengthwise direction, and means for
biasing said valve guide and valve seal towards a rearward,
valve-closing position, said valve guide and valve seal being
located in said second chamber. wherein, during use of said gun,
said hammer when it moves to its forward position, strikes said
valve stem and opens said valve, thereby releasing said pressurized
gas at a pressure not exceeding 300 psi into said breech to propel
said ball in the firing position through said barrel, said release
of said pressurized gas also causing said hammer to be driven
rearwardly to a cocked position.
Description
RELATED APPLICATION
[0001] This application claims priority of U.S. Provisional Patent
Application Ser. No. 60/810,146 filed Jun. 2, 2006, which is
incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] This invention relates to gas-powered guns and, in
particular, guns suitable for firing balls, such as paintballs,
dispensed from a magazine.
[0003] A variety of guns have been developed over many years for
firing balls using compressed gas. A number of these guns have been
developed for the purpose of shooting paintballs which typically
comprise a special, liquid mixture encased in a gelatin layer which
will rupture upon impact of the balls with their targets. These
guns can each be attached to a pressurized gas source in the form
of a metal cylinder containing a gas such as carbon dioxide,
nitrogen or air.
[0004] A common mechanism for firing a gun, including a paintball
gun, involves the use of a sear mechanism and a sliding hammer
which can be held in a cocked position by a sear member. The sear
mechanism can be operated by means of a trigger and, when the
trigger is pulled, the sear member becomes disengaged from the
hammer, allowing the hammer to be driven to its firing position. It
is known to use a coil spring which biases the hammer to the firing
position. In the firing position, the hammer strikes a valve member
causing it to move and release a quantity of pressurized air to
propel a paintball from a loaded position through the gun barrel.
In addition, many gas-powered guns employ gas blowback, i.e. a
smaller quantity of pressurized air which is released when the
hammer strikes the valve, to push the hammer back in order to
reload the gun. In many of these known gas-powered guns, the force
required to open the gas valve is proportional to the area of the
valve stem exposed to the source of pressurized gas. The hammer and
the spring which drives the hammer forwardly must overcome the
force of the pressurized gas on this area in order to open the
valve sufficiently to release the desired quantity of pressurized
gas or air.
[0005] If one can reduce the area of the valve stem which is
exposed to the source of pressurized gas, the result will be that
less force will be required to open the valve. However, there must
be a good seal between the valve seat and the valve body to prevent
leakage or passage of pressurized gas through the valve body when
the valve is closed. Because of this necessity, there is a limit on
the smallest diameter of the valve seat that can be used in
practice if the valve seal and valve body are to seal the
pressurized air properly while at the same time allowing a
sufficient flow of pressurized air through the valve when the valve
is opened. Because of these known gun requirements, prior art
pressurized gas guns generally require a pressure of 500 to 600 psi
in order to operate as desired and to provide a paintball velocity
of 300 fps.
[0006] There remains a need for an improved gas-powered gun which
can operate at reduced gas pressures while still having the
capability of propelling a paintball from the barrel at a velocity
of at least 300 fps. By providing a pressurized gas gun that is
able to operate at a lower operating pressure, and in particular at
an operating pressure not exceeding 300 psi (in one exemplary
embodiment at a pressure not exceeding 250 psi), the gun of the
present disclosure has a pressurized gas valve that can be opened
with less force. Also, a gun constructed according to the present
disclosure can be constructed with a hammer having a reduced weight
as compared to prior art guns operating at much higher pressures of
500-600 psi. By using a hammer of lighter weight, the kickback of
the gun can be reduced, making the gun more comfortable for the
user.
SUMMARY OF THE PRESENT DISCLOSURE
[0007] According to an exemplary embodiment of the present
disclosure, a gas-powered gun for firing balls dispensed from a
magazine into the gun is adapted to be connected to a source of
pressurized gas and includes a gun body having a gun handle and a
breech section capable of receiving one ball at a time from the
magazine. A barrel is connected to a front end of the breech and a
bolt is slidable within the breech section to advance a ball to a
firing position and close off a ball feed port in the breech
section. A hammer is slidable in a first chamber formed in the gun
body. Means are provided to bias the hammer to a forward position
for firing the gun. A trigger is movably mounted on the gun body
and a sear mechanism including a sear member is movably mounted in
the gun body and adapted to hold the hammer in a rear, cocked
position thereof until the trigger is pulled. When the trigger is
pulled, the sear member is disengaged from the hammer and permits
the hammer to move to the forward position. A pressurized gas
circuit is provided for delivering pressurized gas from the source
to the barrel of the gun for propelling one ball at a time
therefrom. The gas circuit includes a gas pressure regulator
capable of providing gas to the gas circuit at a pressure not
exceeding 300 psi, a second chamber for pressurized gas formed in
the gun body and having a gas inlet operatively connected to a gas
outlet of the regulator, and a pressurized gas valve including a
valve body fixably mounted in the gun body in front of the first
chamber and at a rear end of the second chamber. A valve stem is
mounted for sliding movement in a central passage of the valve
body. A movable elongate valve guide is connected to the valve stem
and has a valve seal mounted on a seat section formed on a rear end
of the valve guide. This seat section with the seal has an external
first diameter greater than a second diameter, the latter being the
diameter of a substantial, elongate section of the guide member.
There are also a guide arrangement for holding the valve guide and
guiding movement thereof in a lengthwise direction and means for
biasing the valve guide and valve seal towards a rearward, valve
closing position. The valve guide and valve seal are located in the
second chamber. During use of the gun, the hammer when it moves to
its forward position, strikes the valve stem and opens the valve,
thereby releasing the pressurized gas with a pressure not exceeding
300 psi into the breech to propel the ball in the firing position
through the barrel. The release of the pressurized gas also causes
the hammer to be driven rearwardly to a cocked position.
[0008] These and other aspects of the disclosed gas-powered gun
will become more readily apparent to those having ordinary skill in
the art from the following detailed description taken in
conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] So that those having ordinary skill in the art to which the
present disclosure pertains will more readily understand how to
make and use the subject invention, exemplary embodiments thereof
will be described in detail herein below, with reference to the
drawings wherein:
[0010] FIG. 1 is a right side view of paintball gun or marker
constructed in accordance with the disclosure herein, the gun being
shown without a standard compressed gas cylinder connected thereto
and with only a portion of the barrel being shown;
[0011] FIG. 2 is a detailed vertical cross-section of the breech
portion, the regulator, the gun handle and the trigger section of
the gun of FIG. 1, the cross-section taken in a vertical plane
extending through the central longitudinal axis of the breech and
gun barrel;
[0012] FIG. 3 is a parts diagram illustrating a number of
components of the gun in FIGS. 1 and 2 separately and the manner in
which they are arranged, these components including the valve body,
a valve stem and an elongate valve guide and a cap; and
[0013] FIG. 4 is a further parts diagram illustrating additional
components of the gun of FIG. 1 and the gun body, the components
including a bolt, a hammer connected to the bolt, a hammer spring,
and the gun body.
DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS
[0014] Advantageous gas-powered guns for firing balls, and in
particular paintballs, are disclosed herein. These paintball guns
permit the use of relatively low operating gas pressure in the gun,
and in particular, in the pressurized gas circuit. An exemplary
embodiment of such a gun has a gas regulator capable of providing
gas to the gas circuit at a pressure not exceeding 300 psi and, in
a particular exemplary embodiment at a pressure of about 250 psi.
In the detailed description that follows, these exemplary
embodiments are described. However, the disclosed embodiments are
only illustrative of gas powered guns and markers that can be
constructed in accordance with the present disclosure.
[0015] With reference now to FIGS. 1 and 2, there is illustrated a
gas-powered gun 10 that is capable of firing balls and in
particular paintballs, which can be of standard construction. One
of these balls 12 is shown in a breech section 14 of the gun in
FIG. 2. It will be understood that this gun 10 is adapted to be
connected to a source of pressurized gas (not shown) and typically
this source is a hollow metal cylinder in which the gas can be
stored under pressure. The pressurized gas from the cylinder is fed
to an adjustable gas pressure regulator 16 which can be of standard
construction except that the regulator is set to provide
pressurized gas at a pressure not exceeding 300 psi. The regulator
can be constructed of first and second body parts 15 and 17 which
are threaded together at 19. In one exemplary embodiment of the
present gun, the regulator provides pressurized gas at a pressure
of about 250 psi, a pressure substantially below that used in many
prior art guns to propel individual paintballs from the gun breech
and through the barrel 18. To attach the regulator the first part
15 is first connected to the gun body by means of screw 144 which
also attaches the valve cap. The second part 17 can then be
threaded onto the first part 15. The second part has a pressurized
gas inlet at 200 and an adjustment screw 202 at its bottom end by
which the operating pressure can be adjusted. The regulator has a
pressurized gas outlet 204 at its top end. The paintballs are
typically dispensed from a standard paintball magazine or bulk
loader (not shown) into the breech of the gun through a feed tube
20. It will be understood that paintballs are able to drop one at a
time into the breech under the force of gravity when a gun bolt 22
is in a pulled back or rearward position. The gun bolt 22 is shown
in a forward position in FIG. 2, and the ball 12 in the breech can
be advanced by the bolt to a forwardmost position ready for firing
of the gun. As illustrated in FIG. 4, the bolt is formed with a
L-shaped gas passageway 24 including a longitudinally extending
section having an open end 26 at the front of the bolt and a short
downward section having an open end 28 that is aligned with a short
gas passage 30 formed in the gun body when the bolt is in its
forwardmost position. Located on opposite sides of the downward
extension of passageway 24 are two annular grooves which
accommodate o-rings 32 and 34 which effectively seal a portion of
the elongate chamber 36 in which the bolt is slidably mounted.
Thus, when the bolt is in the forward position, pressurized gas
entering the passageway 24 from passage 30 cannot escape through
any gap between the hammer and the chamber 36. Connected to the
bolt and extending through the bolt is a pin member 38 which can be
formed with an enlarged upper end or head 40 to make it easier to
grasp for the gun user. The pin can be used to pull the bolt to its
rearward position manually, if required. The pin extends through an
upper slot 42 formed above a rear portion of chamber 36 and a lower
slot 44 formed in the gun body below a rearward section of the
chamber 36. The bottom end of the pin is connected to a hammer 46
and in this way, the bolt 38 always moves forwardly or rearwardly
with the hammer 46 which is slidable in a lower chamber 48,
sometimes referred to herein as a first chamber. This lower chamber
is also formed in the gun body indicated generally by reference 50.
This gun body can include a gun handle 52 and the breech section
14. Preferably formed on the gun body or attached thereto is a
trigger guard 54 which extends around an exposed portion of a
trigger 56. In a manner known per se, the trigger is mounted on the
gun body and it can be used to operate a sear mechanism 58 shown in
FIG. 2. The gun handle portion can be detachably connected to the
upper portion of gun body 50 by two screws 81 and 92.
[0016] The sear mechanism includes a sear member 60 which is
movably mounted in the gun body 50 and, in a known manner, is
adapted to hold the hammer 46 in a rear, cocked position thereof
until the trigger 56 is pulled. When the trigger is pulled, the
sear member is disengaged from the hammer and permits the hammer to
move to the forward position shown in FIG. 2. A variety of sear
mechanisms capable of firing a gun are known in the gun art and
accordingly a detailed description of the sear mechanism used to
release the hammer 46 is deemed unnecessary. However, a typical
sear mechanism and trigger are illustrated in FIG. 2 and a brief
description of this particular mechanism is now provided. The
illustrated trigger 56 has a rearward extension 62 which is biased
downwardly by means of a coil spring 64 mounted in the gun handle
and connected at its bottom end to the gun handle. The rearward
extension 62 engages a forward end of the sear member 60, this end
being biased downwardly by means of coil spring 66. Again, the
spring 66 is mounted in the gun handle and has its lower or rear
end connected to the handle. The sear member is able to pivot about
a pivot pin 68 and, when the trigger is pulled so as to overcome
the bias of spring 64, the front end of the sear member is pushed
upwardly which causes an upward projection 70 on the sear member to
move downwardly out of engagement with the hammer, which is formed
with a downwardly facing recess 72. It will be understood that when
the trigger is released and the hammer is driven by gas to its
rearward position, the upward projection 70 of the sear member goes
into the recess 72, thereby holding the hammer in the rearward,
cocked position until the trigger is pulled again.
[0017] The hammer, and therefore the bolt as well, is biased to a
forward position by means of a hammer spring 74 which can be a coil
spring as shown. The forward section of this spring fits snugly
into a longitudinally extending hammer cavity 76 which is closed at
its front end. The spring 74 is also guided and held in position by
means of a guide pin 78 which is secured at its rear end in an
externally threaded cap 80. External threads on a forward portion
82 of the cap engage a threaded section 84 formed in the gun body
at the rear end of the first chamber 48. Section 82 of the cap is
formed with a cylindrical cavity 86 which forms a seat for a rear
end section of the hammer spring as shown in FIG. 2. A further,
smaller cavity at 88 receives a rear end portion of the pin 78. The
rear end portion of the pin 78 can be threaded into the cavity 88
if threads are formed on the pin or the rear end of the pin can be
held in the cavity 88 by friction fit.
[0018] With reference now to the parts diagram of FIG. 3, there are
shown components of a pressurized gas valve that includes a valve
body 90 fixedly mounted in the gun body 50 at the front of the
first or lower chamber 48. The valve body can be held in position
by means of a hollow threaded connector 91 that extends through a
hole formed in the gun body in front of the trigger. The screw 92
used to attach the gun handle portion can extend through the
threaded passage in connector 91. If desired, a shoulder 94 can be
formed at the front end of the lower chamber 48. It will also be
noted that the valve body is located rearwardly of a second chamber
98 which extends between the front opening 96 and the shoulder 94.
The gas valve includes a valve stem 100 which has a cylindrical
rear end section 102, a narrower central section 104 and a threaded
front end section 106. An annular shoulder 108 can be provided
between the narrower section 104 and the front end section 106.
When the gun is assembled as shown in FIG. 2, the valve stem 100 is
movable in a central passageway 110 formed in the valve body. This
passageway has a rear portion 112 of smaller diameter than a
longer, front portion 114. The rear end section 102 of the valve
stem fits snugly within the rear portion 112 but is slidable
therein. It will be understood that when the gas valve is in the
open position, some pressurized gas can escape past or through the
rear end section 102 in order to drive the hammer 46 to its
rearward or cocked position. For example, pressurized gas can pass
through a suitably small gap between the periphery of section 102
and portion 112 of the passageway. In the alternative, a central
passageway can be provided in the section 102 to allow pressurized
gas to pass from the annular space around the central section 104
and through the passageway in section 102 to the front of the
hammer. An upwardly extending passageway or opening 120 extends
from a top side of the valve body 90 to the passageway 110 and when
the gas valve is open, pressurized gas can pass through passageway
110, the opening 120 and the passage 30 in the gun body to enter
the breech of the gun for firing a paintball 12. The valve stem can
also be made without the central section 104 being narrower
provided there is sufficient clearance around the central section
for the gas to pass into the opening 120.
[0019] Located forwardly of the valve stem is a movable, elongate
valve guide 122 having a valve seal 124 mounted on a seat section
126 formed on a rear end of the valve guide. The seat section forms
a shallow recess 128 capable of receiving and holding the valve
seal 124. Extending longitudinally forwardly from the recess 128 is
a threaded passage 130 having a closed inner end at 132. The valve
seal 124 is annular and has a central opening 134 through which the
front end section 106 of the valve stem can extend and be threaded
into the passage 130. Thus the valve guide 122 is firmly connected
to the valve stem and moves with it. It will be appreciated that
the valve guide 122 holds the rear portion of the valve stem in
position. The valve stem is moved a short distance by the hammer
when the gun is fired in order to open the gas valve. The valve
guide has a substantial, elongate section 136 that extends from the
seat section 126 to the front end of the guide, this elongate
section having a diameter D.sub.2. Located in a forward section of
the valve guide is another elongate passage 138 which is sized to
receive at least a portion of a coil spring 140. Also shown in FIG.
3 and mounted in the front section of the second chamber 98 is a
valve cap 142 which provides a guide arrangement for holding the
valve guide 122 and guiding movement thereof in a lengthwise
direction. The spring 140 provides means for biasing the valve
guide and valve seal towards a rearward, valve closing position
and, as can be seen in FIG. 2, the valve guide and valve seal are
located in the second chamber 98.
[0020] The valve cap 142 can be held in the front portion of the
chamber 98 by means of a bolt or screw 144 which is also used to
mount the regulator 16 as shown in FIG. 2. The threaded end of the
bolt extends into a threaded side hole 146 formed in the cap. In
order to seal the front portion of the chamber 98, the cap is
formed with a first annular groove to receive an O-ring seal 150.
There is also a second annular groove forwardly of the hole 146 to
receive an O-ring seal 151. The cap is formed with a central
passage that includes larger diameter section 152 in which a front
section of the valve guide 122 is slidably received and a smaller
diameter section 154 which receives a portion of the spring 140.
Extending around the section 152 is an annular groove that receives
an O-ring seal 156. This seal effectively closes the gap between
the valve guide and the cylindrical wall of section 152 and
prevents pressurized gas from passing between the chamber holding
spring 140 and the second chamber 98.
[0021] It will be appreciated by those skilled in the construction
of guns operated by pressurized gas and employing a standard type
of gas valve and valve stem that the force required to open the
valve is proportional to the area of the valve stem exposed to the
source of pressurized gas. Thus, if this affected area can be
reduced, the force required to open the valve will be less. In the
gas powered gun of the present disclosure, the operating pressure
required to operate the gun and propel paintballs through the
barrel is reduced by providing the valve seat section 126 on an
elongate or extended valve guide 122. In fact, in the exemplary
embodiment illustrated, the valve guide 122 extends into the valve
cap 142 with an O-ring extending around the forward section of the
valve guide. This reduces the force applied by the pressurized air
or gas and allows the valve stem 100 to open with less force.
Instead of the force being based on the area
A1=.PI.(D.sub.1/2).sup.2 the required force is proportional to area
A2=.PI.(D.sub.1/2).sup.2-.PI.(D.sub.2/2).sup.2. Thus, in a gun
constructed in accordance with the present disclosure, less force
from the hammer spring is required to open the valve, which valve
is opened when the hammer strikes the rear end of the valve stem.
Also, with the valve and valve guide configuration of the present
disclosure, it is possible to reduce the weight of the hammer 46
and, by having a lighter hammer, the kickback of the gun can be
reduced, making it more comfortable for the user. Also the reduced
gas pressures and lighter hammer in the present gun allow the use
of a lighter spring 74 for the hammer and this puts less force on
the paintball when pushing it forward. This reduces the chance of
breaking the ball and allows the use of more fragile paintballs
that break easier on the target. Use of a lighter spring and hammer
result in less stress on the sear and handle frame. A gun
constructed according to the present disclosure using a regulator
16, which can be an adjustable regulator, can be constructed so as
to propel a paintball at a speed of at least 300 fps using an
operating gas pressure provided by the regulator of about 250
psi.
[0022] Another improvement in the disclosed gas powered gun is the
construction of the valve stem itself. In particular, in the
exemplary illustrated valve stem, the narrow central section 104
has a reduced diameter D4. This creates an additional area equal to
the transverse area of rear end section 102 minus the transverse
area of section 104 upon which the pressurized air can act to close
the valve faster. Construction of the valve in this manner does not
result in more force being required to open the valve since this
area will be exposed to the pressurized air only when the valve is
opened.
[0023] It will be appreciated that the improved valve and valve
guide arrangement disclosed herein can also be employed in known
guns where the hammer is not biased to the firing position by means
of a hammer spring but rather is controlled by a gas operated
piston. In this type of gas-powered gun, no blowback is required to
recock the gun. An example of a paintball gun of this type is
described and illustrated in U.S. Pat. No. 6,973,748 issued Dec.
13, 2005 to NPF Limited. The specification and drawings of this
patent are incorporated herein by reference. By employing a valve
and valve guide arrangement with a reduced pressure regulator as
disclosed in the present disclosure, the piston which controls the
hammer can be operated at a lower pressure and this in turn
substantially improves the efficiency of this type of gun.
[0024] While the present invention has been illustrated and
described as embodied in various exemplary embodiments, it is to be
understood that the present invention is not limited to the details
shown herein, since it will be understood that various omissions,
modifications, substitutions and changes in the forms and details
of the disclosed gas powered guns and their operation may be made
by those skilled in the art without departing in any way from the
spirit and scope of the present invention. For example, those of
ordinary skill in the gas powered gun art will readily adapt the
present disclosure for various other applications without departing
from the spirit and scope of the present invention.
* * * * *