U.S. patent application number 10/786973 was filed with the patent office on 2005-08-25 for valve operating system in an internal combustion engine.
Invention is credited to Strepek, James.
Application Number | 20050183684 10/786973 |
Document ID | / |
Family ID | 34861887 |
Filed Date | 2005-08-25 |
United States Patent
Application |
20050183684 |
Kind Code |
A1 |
Strepek, James |
August 25, 2005 |
Valve operating system in an internal combustion engine
Abstract
A valve operating system for an internal combustion engine has a
rocker arm, a rocker actuation mechanism, a ball and socket joint,
and a valve activation device. The rocker arm is connected to the
rocker actuation mechanism. The ball and socket joint is connected
to the rocker arm and to the valve activation device. The ball and
socket joint has a retention device connected to a ball portion and
a socket portion. The retention device holds the ball and socket
portions together. The retention device is positioned in an
external groove formed by the socket portion.
Inventors: |
Strepek, James; (Lombard,
IL) |
Correspondence
Address: |
INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY
4201 WINFIELD ROAD
P.O. BOX 1488
WARRENVILLE
IL
60555
US
|
Family ID: |
34861887 |
Appl. No.: |
10/786973 |
Filed: |
February 25, 2004 |
Current U.S.
Class: |
123/90.48 |
Current CPC
Class: |
F01L 2001/187 20130101;
F01L 1/14 20130101; F01L 1/181 20130101 |
Class at
Publication: |
123/090.48 |
International
Class: |
F01L 001/18; F01L
001/14 |
Claims
1. A valve operating system for an internal combustion engine,
comprising: a rocker arm; a rocker actuation mechanism connected to
the rocker arm; a ball and socket joint having a wire-like
retention device connected to a ball portion and a socket portion,
wherein the socket portion has a foot extension, wherein the
wire-like retention device is positioned in a groove formed by the
socket portion, wherein the ball portion is connected to the rocker
arm; and a valve activation device connected to the socket
portion.
2. The valve operating mechanism of claim 1, wherein the socket
portion forms a cavity, wherein the valve activation device is
connected to the socket portion continuously along an outer
diameter of the foot extension, and wherein the socket portion
forms the exterior groove between the foot extension and an
entrance to the cavity.
3. The valve operating mechanism of claim 1, wherein the ball
portion has a flange between a pin extension and an interface
surface.
4. The valve operating mechanism of claim 1, wherein the ball
portion has a pin extension inserted into a hole formed by the
rocker arm.
5. The valve operating mechanism of claim 1, wherein the ball
portion has an interface surface, wherein the socket portion forms
a cavity with an interior surface, and wherein the interface
surface is positioned adjacent to the interior surface in the
cavity.
6. A ball and socket joint for a valve operating system in an
internal combustion engine, comprising: a ball portion having a
flange between a pin extension and an interface surface; a socket
portion having a foot extension, wherein the socket portion forms a
cavity with an interior surface, where the socket portion forms a
groove between the foot extension and an entrance to the cavity;
and a wire-like retention device having a pin segment connected to
a foot segment, wherein the pin segment forms a pin loop, wherein
the foot segment forms a foot loop; wherein the interface surface
is positioned adjacent to the interior surface in the cavity,
wherein the pin extension is disposed in the pin loop, wherein the
pin segment is adjacent to the flange, wherein the socket portion
is disposed in the foot loop, and wherein the foot segment is
positioned in the groove.
7. The ball and socket joint of claim 6, wherein the interface
surface has a smaller cross-section than the flange.
8. The ball and socket joint of claim 6, wherein the pin extension
has a smaller cross-section than the flange.
9. The ball and socket joint of claim 6, wherein the pin loop has a
smaller cross-section than the flange.
10. The ball and socket joint of claim 6, wherein the socket
portion has a smaller cross-section at the exterior groove than at
the foot extension.
11. The ball and socket joint of claim 6, wherein the socket
portion has a smaller cross-section at the groove than at the
entrance to the cavity.
12. The ball and socket joint of claim 11, wherein the socket
portion has a smaller cross-section at the groove than at foot
extension.
13. The ball and socket joint of claim 11, wherein the foot segment
extends partially along a circumference of the groove.
14. The ball and socket joint of claim 5, wherein the pin segment
extends partially along a circumference of the pin extension.
15. The ball and socket joint of claim 6, wherein the pin segment
forms a plurality of windings around the pin extension.
16. An internal combustion engine with a valve operating system,
comprising: a cylinder head mounted on a crankcase, wherein the
cylinder head and crankcase form a cylinder, wherein the cylinder
head forms a valve path connected to the cylinder; a valve disposed
within the valve path; a rocker arm mounted on the cylinder head; a
rocker actuation mechanism connected to the rocker arm; a ball and
socket joint having a wire-like retention device connected to a
ball portion and a socket portion, wherein the socket portion has a
foot extension, wherein the wire-like retention device is
positioned in a groove formed by the socket portion, wherein the
ball portion is connected to the rocker arm; and a valve activation
device connected to the socket portion, wherein the valve
activation device is connected to the valve.
17. The internal combustion engine of claim 16, wherein the valve
activation device is connected to the socket portion continuously
along an outer diameter of the foot extension, wherein the socket
portion forms a cavity, and wherein the socket portion forms the
exterior groove between the foot extension and an entrance to the
cavity.
18. The internal combustion engine of claim 16, wherein the ball
portion has a flange between a pin extension and an interface
surface, wherein the socket portion forms a cavity with an interior
surface, and wherein the interface surface is positioned adjacent
to the interior surface in the cavity.
19. The internal combustion engine of claim 18, wherein the pin
extension is inserted into a hole formed by the rocker arm.
20. The internal combustion engine of claim 16, wherein the valve
is one of an inlet valve and an exhaust valve.
Description
FIELD OF THE INVENTION
[0001] This invention generally relates to valve operating systems
in internal combustion engines. More particularly, this invention
relates to a valve operating system having a rocker arm connected
to a ball and socket joint for operating a cylinder valve in an
internal combustion engine.
BACKGROUND OF THE INVENTION
[0002] Internal combustion engines convert chemical energy from a
fuel into mechanical energy. The fuel may be petroleum-based
(gasoline or diesel), natural gas, another combustible material, or
a combination thereof. Most internal combustion engines mix the
fuel with air and then inject the air-fuel mixture into one or more
cylinders formed by a crankcase, cylinder head, and piston. The
internal combustion engine may use a camshaft system, a
hydraulically activated electronically controlled unit injection
(HEUI) system, or the like to control the injection of the air-fuel
mixture into the cylinders. In each cylinder, the fuel ignites to
generate rapidly expanding gases that actuate the piston. The fuel
may be ignited by compression such as in a diesel engine or through
some type of spark such as the spark plug in a gasoline engine. The
piston usually is connected to a crankshaft or similar device for
converting the reciprocating motion of the piston into rotational
motion. The crankshaft also causes the piston to push the exhaust
gases out of the cylinder during a return stroke, thus preparing
the cylinder to receive more of the air-fuel mixture. The
rotational motion from the crankshaft may be used to propel a
vehicle, operate a pump or an electrical generator, or perform
other work. The vehicle may be a truck, automobile, boat, or the
like.
[0003] Most internal combustion engines have one or more exhaust
valves connected to each cylinder. The exhaust valves typically
open at the appropriate time to permit the exhaust gases to exit
the cylinder. Many internal combustion engines have one or more
inlet valves connected to each cylinder. The inlet valves typically
open at the appropriate time to permit the air-fuel mixture to
enter the cylinder.
[0004] Many internal combustion engines have a rocker arm assembly
for operating the exhaust and inlet valves. The rocker arm assembly
typically has separate rocker arms for each cylinder. Usually,
there is one rocker arm for operating the exhaust valve(s) and
another rocker arm for operating the inlet valve(s). The midsection
of each rocker arm usually is mounted on the cylinder head of the
internal combustion engine in such a way that the ends of the
rocker arm articulate in opposite directions similar to a see-saw
motion. One end of the rocker arm usually is connected to a push
rod and/or camshaft mechanism. The other end of the rocker arm
usually is connected to a valve activation device. During engine
operation, the push rod moves or pushes one end of the rocker arm
up thus causing the other end of the rocker arm to move or push
down against the valve activation device. The valve activation
device typically has a spring that biases the valve into a closed
position. The pressure from the rocker arm causes the valve
activation device to open the valve. When the push rod moves or
pulls the end of the rocker arm down, the other end of the rocker
arm to moves up or away from the valve activation device. Without
the pressure of the rocker arm, the valve activation device closes
the valve. When there are multiple valves, the rocker arm may
connect to a valve bridge that is connected to the valve activation
devices for each valve. The pressure from the rocker arm causes the
valve bridge to press against the connected valve activation
devices, thus opening the connected valves at substantially the
same time. The rotational motion of the rocker arm against the
valve activation device may cause wear of the components in
contact. The rotational movement also may cause the rocker arm to
slip where it contacts the valve activation- device. This wear and
slippage may affect engine operation, maintenance, and
durability.
[0005] To reduce potential wear and slippage, many internal
combustion engines use a rocker arm having a concave circular
surface at the contact point with the valve activation device. Some
internal combustion engines have a valve activation device with a
convex circular surface. This convex circular surface may be
configured to receive the concave circular surface of the rocker
arm and thus form a ball and socket or similar type of connection.
In addition, the contact point between the rocker arm and the valve
or the valve bridge also may be lubricated.
[0006] In some internal combustion engines, the rocker arm and
valve activation device are connected by a separate ball and socket
joint. The ball typically has a pin extension on the opposite side
of a concave circular surface. The pin extension has a conical or
cylindrical shape and is inserted into a hole formed in the end of
the rocker arm. The socket has a convex surface on one side of that
forms a cavity. The socket connects to the valve activation device
on the side opposite the convex surface. When assembled, the ball
is positioned inside the cavity of the socket so that the concave
surface of the ball is adjacent to the convex surface of the
socket. The ball and socket usually are held together by a
retention mechanism such as a spring or a wire.
[0007] The ball and socket joint may be held together by a spring
mounted on either side of radial flanges formed by the ball and
socket. The ball may have a radial flange formed between the pin
extension and the concave circular surface. The socket may have a
radial flange formed along the entrance to the cavity. The spring
typically is positioned on the sides of the flanges that are
opposite to the concave and convex surfaces. The spring biases or
presses the ball and socket together. The spring may increase the
material and assembly costs of the ball and socket joint. The
spring also may interfere with operation of the valves in the
internal combustion engine. If the spring tension is too tight, the
ball may not rotate as freely in the socket as desired for
operation of the valves. If the spring tension is too loose, the
spring may resist or oppose the movement of the rocker arm by the
push pin. If the spring looses its resiliency or becomes stretched,
it may extend into or beyond the interface between the flat surface
of the socket and the valve or the valve bridge.
[0008] The ball and socket joint also may be held together by an
O-ring positioned on the inside surface of the cavity formed by the
socket. The O-ring usually is a wire positioned in a radial groove
on the inside surface of the cavity. When the ball is inside the
cavity, the O-ring is between the ball and the entrance to the
cavity. The O-ring may increase the material and assembly costs of
the ball and socket joint. The socket may have a deeper cavity to
accommodate the inside groove and O-ring. If the ball is inserted
into the socket after the O-ring is inserted into the inside
groove, the ball may have to be forcibly inserted into the socket.
This forcible insertion may damage the O-ring and the ball. If the
O-ring is inserted into the groove after the ball is inserted into
the socket, the socket may have an even deeper cavity so the O-ring
can be positioned in the inside groove with less interference from
ball. The O-ring also may obstruct the rotational movement of the
ball in the socket. The O-ring may block the movement of the
concave surface when the ball rotates. The pin extension may strike
the side of a cavity.
[0009] The ball and socket joint additionally may be held together
by a metal or plastic ring that encompasses both parts. The ring
may interfere with the rotational motion of the ball in the socket.
The ring may become loose and interfere with the interface between
the socket and the valve activation devices. The ring also may
reduce or block lubrication fluid from reaching the ball and socket
joint.
[0010] The ball and socket joint further may be held together by a
folded radial edge or lip along the inside of the entrance to the
cavity in the socket. If the ball is inserted into the socket after
the radial edge is folded, the ball may have to be forcibly
inserted into the socket. The forcible insertion may damage the
radial edge and the ball. The radial edge may obstruct the
rotational movement of the ball in the socket. The radial edge may
block the movement of the concave surface when the ball rotates.
The pin extension may strike the radial edge
SUMMARY
[0011] This invention provides a valve operating system for an
internal combustion engine. The valve operating system has a ball
and socket joint with a retention device positioned in an external
groove on the ball and socket joint. The retention device holds the
ball and socket joint together.
[0012] A valve operating system for an internal combustion engine
may have a rocker arm, a rocker actuation mechanism, a ball and
socket joint, and a valve activation device. The rocker arm is
connected to the rocker actuation mechanism and to the ball and
socket joint. The ball and socket joint has a retention device
connected to a ball portion and a socket portion. The retention
device is positioned in an external groove formed by the socket
portion. The ball portion is connected to the rocker arm. The valve
activation device is connected to the socket portion.
[0013] A ball and socket joint for a valve operating system in an
internal combustion engine may have a ball portion, a socket
portion, and a retention device. The ball portion has a flange
between a pin extension and an interface surface. The socket
portion has a foot extension and forms a cavity with an interior
surface. The socket portion forms an exterior groove between the
foot extension and an entrance to the cavity. The retention device
has a pin segment connected to a foot segment. The pin segment
forms a pin loop. The foot segment forms a foot loop. The interface
surface of the ball portion is positioned adjacent to the interior
surface in the cavity of the socket portion. The pin extension is
disposed in the pin loop. The pin segment is adjacent to the
flange. The socket portion is disposed in the foot loop. The foot
segment is positioned in the external groove.
[0014] An internal combustion engine with a valve operating system
may have a cylinder head mounted on a crankcase, a valve, a rocker
arm, a rocker actuation mechanism, a ball and socket joint, and a
valve activation device. The cylinder head and the crankcase form a
cylinder. The cylinder head forms a valve path connected to the
cylinder. The valve is disposed within the valve path. The rocker
arm is mounted on the cylinder head. The rocker actuation mechanism
is connected to the rocker arm. The ball and socket joint has a
retention device connected to a ball portion and a socket portion.
The retention device is positioned in an external groove formed by
the socket portion. The ball portion is connected to the rocker
arm. The valve activation device is connected to the socket
portion. The valve activation device is connected to the valve.
[0015] Other systems, methods, features and advantages of the
invention will be, or will become, apparent to one with skill in
the art upon examination of the following figures and detailed
description. It is intended that all such additional systems,
methods, features and advantages be included within this
description, be within the scope of the invention, and be protected
by the following claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The invention can be better understood with reference to the
following drawings and description. The components in the figures
are not necessarily to scale, emphasis instead being placed upon
illustrating the principles of the invention. Moreover, in the
figures, like referenced numerals designate corresponding parts
throughout the different views.
[0017] FIG. 1 is a schematic cross-section view of a valve
operating system in an internal combustion engine.
[0018] FIG. 2 is a front view of a ball and socket joint for a
valve operating system.
[0019] FIG. 3 is a back view of the ball and socket joint shown in
FIG. 2.
[0020] FIG. 4 is a top view of the ball and socket joint shown in
FIG. 2.
[0021] FIG. 5 is a bottom view of the ball and socket joint shown
in FIG. 2.
[0022] FIG. 6 is an expanded front view of the ball and socket
joint shown in FIG. 2.
[0023] FIG. 7 is a back view of the retention device shown in FIG.
6.
[0024] FIG. 8 is a side view of another ball and socket joint for a
valve operating system.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0025] FIG. 1 is a schematic cross-section view of a valve
operating system 102 in an internal combustion engine. The valve
operating system 102 may have a rocker actuation mechanism 104, a
rocker arm 106 mounted on a base 108, a ball and socket joint 110,
and a valve activation device 112. The rocker actuation mechanism
104 is connected to one end of the rocker arm 106. The rocker
actuation mechanism 104 may be a camshaft, a pushrod connected to a
camshaft, or the like. The ball and socket joint 104 is connected
to the other end of the rocker arm 106 and to the valve activation
device 112. The ball and socket joint 110 has an exterior
indentation or groove for holding a retention device. The ball and
socket joint 110 may have a portion configured for insertion into a
hole formed by the rocker arm 106. The base 108 of the valve
operating system 102 may be connected to a cylinder head 120 or
other component of the internal combustion engine. The cylinder
head 120 is mounted on a crankcase 122, which forms a cylinder 128.
The cylinder 128 has a piston 130 disposed therein. The cylinder
128 also has a valve 124 disposed within a valve path 132 formed by
the cylinder head 122. The valve 124 may be an inlet valve for
allowing an air-fuel mixture to enter the cylinder 128. The valve
124 may be an exhaust valve for allowing exhaust gases to exit the
cylinder 128. The valve 124 is connected to the valve activation
device 112 that opens and closes the valve 124. When no pressure is
applied, the valve activation device 112 may bias or otherwise
maintain the valve in a closed position. When pressure is applied,
the valve activation device 112 may move the valve into an opened
position. The valve activation device 112 may include a valve
bridge for connecting the ball and socket joint 110 to multiple
valves 124. While a particular configuration is shown, the valve
operating mechanism may have other configurations including those
with fewer or additional components.
[0026] The internal combustion engine may be a gasoline engine, a
diesel engine, or the like. The internal combustion engine may be a
diesel engine with a hydraulically activated electronically
controlled unit injection (HEUI) fuel system. The internal
combustion engine may have six, eight, or another number of
cylinders. The internal combustion engine may have other components
(not shown) such as a fuel injector for each cylinder, pumps, an
engine cooling system, and the like. The internal combustion engine
may have multiple valve operating systems 102, which may be
combined to form a rocker arm assembly or the like. The internal
combustion engine may have two or more valve operating systems 102
for each cylinder 128. The internal combustion engine may have one
or more valve bridges 126; each connected to operate a set of like
valves, such as the inlet valves or the exhaust valves of a
cylinder, at substantially the same time.
[0027] During operation of the valve operating system 102, the
rocker actuation mechanism 104 moves one end of the rocker arm 106
in an up-and-down motion. This movement rotates the rocker arm 106
at the base 108, thus moving the other end of the rocker arm 106 in
the opposite direction. When the rocker actuation mechanism 104
moves one end of the rocker arm 106 in an up direction, the other
end of the rocker arm 106 presses the ball and socket joint 110
against the valve activation device 112 to open valve 124. When the
rocker actuation mechanism 104 moves one end of the rocker arm 106
in a down direction, the other end of the rocker arm 106 moves the
ball and socket joint 110 away from the valve activation device 112
to close valve 124. Up-and-down motion includes side-to-side and
other opposite motion movements.
[0028] FIGS. 2-7 show various views of a ball and socket joint 210
and its components. The ball and socket joint 210 has a ball
portion 260, a socket portion 270, and retention device 280. The
ball portion 260 is configured to rotate or move within the socket
portion 270. The retention device 280 holds the ball portion 260
and the socket portion 270 together. The ball portion 260 may be
connected to a rocker arm of a valve operating system. The socket
portion 270 may be connected to a valve activation device of a
valve operating system. The ball and socket joint 210 may be made
of metal, plastic, and the like, or a combination thereof. The ball
and socket joint 210 may be made of an elastomeric material.
[0029] The ball portion 260 has a pin extension 262, an interface
surface 264, and a flange 266. The pin extension 262 is on a side
opposite the interface surface 264. The flange 266 extends radially
along the circumference of the ball portion 260 at a position
between the pin extension 262 and the interface surface 264. The
flange 260 may have a circular or angular shape. Circular includes
circles, ovals, and like shapes. Angular includes triangle,
rectangle, and like shapes. The pin extension 262, the interface
surface 264, and the flange 266 may have the same centerline or
different centerlines. The centerlines may be off-center or at an
angle to each other. The pin extension 262 may have a cylindrical,
pyramidal, or conical configuration. The pin extension 262 may be
configured for insertion into a hole formed by a rocker arm in a
valve operating mechanism. The pin extension 262 may have a smaller
cross-section than the flange 266. The interface surface 264 may
have a circular or other concave shape. The interface surface 264
may have the same or a smaller cross-section than the flange
266.
[0030] The socket portion 270 forms a cavity 272 with an entrance
or opening 274 at one end. The socket portion 270 has a foot
segment 276 that extends radially from the exterior surface of the
socket portion 270. The foot segment may be at or toward the end
opposite the entrance 274. The cavity 272 is formed by an interior
surface, which may have a circular or other convex surface. The
cavity 272 may be configured to receive the interface surface 264
of the ball portion 260. The surface of the cavity 272 may be
configured to follow the pattern the interface surface 264. The
socket portion 270 also forms an indentation or groove 278 that
runs along the exterior circumference of the socket portion 270
between the entrance 274 and the foot segment 276. The socket
portion 270 may have a smaller cross-section at the exterior groove
278 than at the entrance 274 to the cavity 272. The socket portion
270 also may have a smaller cross-section at the exterior groove
278 than at the foot segment 276.
[0031] The retention device 280 has a bridge segment 282 connecting
a pin segment 284 to a foot segment 286. The pin segment 284 and
the foot segment 286 extend tangentially from the bridge segment
282. Tangentially includes partially or substantially tangent. The
bridge segment 282 may have a flat, curvilinear, wavy, or angular
shape. The retention device 280 may be made from spring steel or
another malleable material. The retention device 280 also may be
made from a thermoplastic or another semi-rigid or rigid
material.
[0032] The pin segment 284 forms a pin loop 288. The cross-section
of the pin loop 288 is greater than or equal to the cross-section
of the pin extension 262. The cross-section of the pin loop 288 is
less than the cross-section of the flange 266. The pin segment 284
may have a tail portion 292 that alters the direction of the pin
segment 284.
[0033] The foot segment 286 forms a foot loop 290. The cross
section of the foot loop 290 may be greater than or equal to the
cross-section of the socket portion 270 at the exterior groove 278.
The cross section of the foot loop 290 may be less than the
cross-section of the socket portion 270 at the foot segment 276.
The cross section of the foot loop 290 also may be less than the
cross-section of the socket portion 270 at the entrance 274 to the
cavity 272.
[0034] When assembled, the retention device 280 holds the ball
portion 260 and the socket portion 270 together with the interface
surface 264 positioned adjacent to the interior surface of the
cavity 272. The pin extension 262 is positioned inside the pin loop
288 with the pin segment 284 disposed adjacent to the flange 266 on
the side opposite the interface surface 264. The pin segment 284
may extend partially or fully along the circumference of the pin
extension 262. The socket portion 270 is positioned inside the foot
loop 290 with the foot segment 286 disposed within the exterior
groove 278. The foot segment 286 may extend partially or fully
along the circumference of the socket portion 870 at the exterior
groove 278. The retention device 280 may be formed by bending and
wrapping a wire or like material around the ball portion 260 and
the socket portion 270. The retention device 280 may be formed
first for insertion of the ball portion 260 and socket portion 270
into their positions. The flange 266 of the ball portion 260 may
have a smaller cross-section than the foot loop 290 so that the
ball portion 260 may pass through the foot loop 290 when the pin
extension 262 is inserted in the pin loop 288.
[0035] FIG. 8 shows another a ball and socket joint 810 having has
a ball portion 860, a socket portion 870, and retention device 880.
The ball portion 860 is configured to rotate or move within the
socket portion 870. The retention device 880 holds the ball portion
860 and the socket portion 870 together. The ball portion 860 may
be connected to or inserted in a rocker arm in a valve operating
system. The socket portion 870 may be connected to a valve or valve
bridge for a cylinder of an internal combustion engine. The ball
portion 860 is essentially the same as the ball portion previously
discussed. The ball portion 860 has a pin extension 862, an
interface surface, and a flange 866. The socket portion 870 is
essentially the same as the socket portion previously discussed.
The socket portion 870 forms a cavity with an entrance or opening
874 at one end and a foot segment 876 at the opposite end. The
socket portion 870 also forms an exterior groove 878 between the
entrance 874 and the foot segment 876. The retention device 880 is
essentially the same as the retention device previously discussed
except for the pin segment. The retention device 880 has a bridge
segment 882 between a pin segment 884 and a foot segment 886. The
foot segment 886 forms a foot loop 890. The pin segment 884 forms a
plurality of windings around the pin extension 862. A plurality of
windings includes any number of windings and partial windings
greater than about one winding. The plurality of windings form
multiple pin loops, which may have the same or different
cross-sections. The multiple windings may create a spring-like or
bias effect to hold the ball portion 860 against the socket portion
870.
[0036] While various embodiments of the invention have been
described, it will be apparent to those of ordinary skill in the
art that other embodiments and implementations are possible within
the scope of the invention. Accordingly, the invention is not to be
restricted except in light of the attached claims and their
equivalents.
* * * * *