U.S. patent application number 14/276699 was filed with the patent office on 2014-11-27 for change over station and method.
This patent application is currently assigned to STRATA PRODUCTS WORLDWIDE, LLC. The applicant listed for this patent is David Emerson Maust, Kyle R. Murray, John J. Reinmann, Jr.. Invention is credited to David Emerson Maust, Kyle R. Murray, John J. Reinmann, Jr..
Application Number | 20140349562 14/276699 |
Document ID | / |
Family ID | 51177340 |
Filed Date | 2014-11-27 |
United States Patent
Application |
20140349562 |
Kind Code |
A1 |
Maust; David Emerson ; et
al. |
November 27, 2014 |
Change Over Station and Method
Abstract
A change over station (COS) for persons in a hazardous
environment includes a steel housing having only a single entrance
door, a chamber, and an air lock portion. The COS includes a first
elongate seat disposed in the chamber and a plurality of compressed
air cylinders disposed in the seat. The COS includes plumbing
connected to the air cylinders formed of gas lines and valves and
an exhaust muffler including first, second and third air paths that
provide air into the chamber. The third air path is door activated
when the door is opened by a door activated switch. The COS
includes a storage portion disposed in the housing having supplies,
including water and SCSRs or SCBAs. A method for providing a
protected environment to miners from a mine environment in a
mine.
Inventors: |
Maust; David Emerson;
(Grantsville, MD) ; Murray; Kyle R.; (Somerset,
PA) ; Reinmann, Jr.; John J.; (Alpharetta,
GA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Maust; David Emerson
Murray; Kyle R.
Reinmann, Jr.; John J. |
Grantsville
Somerset
Alpharetta |
MD
PA
GA |
US
US
US |
|
|
Assignee: |
STRATA PRODUCTS WORLDWIDE,
LLC
Sandy Springs
GA
|
Family ID: |
51177340 |
Appl. No.: |
14/276699 |
Filed: |
May 13, 2014 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
61827348 |
May 24, 2013 |
|
|
|
Current U.S.
Class: |
454/172 |
Current CPC
Class: |
E21F 11/00 20130101;
E21F 1/145 20130101; E21F 1/085 20130101 |
Class at
Publication: |
454/172 |
International
Class: |
E21F 1/00 20060101
E21F001/00; E21F 1/08 20060101 E21F001/08; E21F 1/14 20060101
E21F001/14 |
Claims
1. A change over station (COS) for persons in a hazardous
environment comprising: a steel housing having only a single door,
a chamber, and an entrance portion, the door opening to the air
lock portion, the air lock portion connected to the chamber; a
first elongate seat disposed in the chamber; a plurality of
compressed gas cylinders disposed in the seat; plumbing connected
to the gas cylinders formed of gas lines and valves and an exhaust
muffler, including a first gas path through the lines that provides
a continuous flow or gas into the chamber through the muffler at a
rate of greater than 4 cfm when the plumbing is in an on state, a
second gas path through the lines that provides a continuous flow
of gas into the chamber through the muffler at a rate of less than
1.5 cfm when the plumbing is in a standby state, and a third gas
path through the lines which is door activated when the door is
opened by a door activated switch which provides additional gas
flow as long as the door is open at a rate of greater than 4 cfm
into the chamber through the muffler; a valve control panel through
which the plumbing extends and which is disposed on the outside of
the housing which controls whether the plumbing is in the on state
or the standby state; and a storage portion disposed in the housing
having supplies, including water and SCSRs or SCBAs.
2. The COS of claim 1 wherein the plumbing includes a primary valve
that controls whether gas from the gas cylinders follows the first
path or the second path.
3. The COS of claim 2 where the primary valve is a 3 way valve,
Off, On, and Standby; a. Off--off b. On--chamber is ready for entry
c. Standby-chamber is activated with a trickle purge to keep the
chamber clear of harmful gas after a first entry until a subsequent
group arrives at the COS.
4. The COS of claim 3 wherein the plumbing through the first path
and the second path creates positive pressure to keep contaminants
out when the door is open.
5. The COS of claim 4 wherein the door activated switch at the door
activates a secondary valve of the plumbing that increases gas flow
rate into the chamber and blows gas out the open door.
6. The COS of claim 5 wherein the chamber has a net height of 60''
and the housing has a flat top to maximize interior head room.
7. The COS of claim 6 wherein the seat height is about 16'' to
allow for a 6' person to sit upright in the chamber.
8. The COS of claim 7 wherein the housing is approximately 12' long
and narrow enough that it fits in a shipping container. 3 units in
a 40' container.
9. The COS of claim 8 which handles 3 sequenced 10 man change over
for a total of 10 men.
10. The COS of claim 9 including a second elongate seat and wherein
seat provides 24''of space per man, and the seats provide gas
cylinder storage for up to 8 bottles is available.
11. The COS of claim 10 wherein the storage portion serves as
storage for 30 SCSRs as well as 90 quarts of water.
12. The COS of claim 11 wherein the plumbing includes an orifice
and compressed gas flow control would be facilitated via the
orifice.
13. The COS of claim 12 wherein the space under the seats will
allow for up to 8 bottles or a maximum of 4 hours in the ON mode,
the standby mode substantially extends the reserve time by only
releasing a trickle flow to maintain a slight positive
pressure.
14. The COS of claim 13 wherein the storage portion of the water
and SCSRs are left and right just inside the door for easy
access.
15. The COS of claim 14 including hanging plastic curtain strips to
help isolate the COS atmosphere from the mine.
16. The COS of claim 15 wherein the control panel is recessed to
prevent damage and is provided with a tamper evident seal.
17. A method for providing a protected environment to miners from a
mine environment in a mine comprising the steps of: opening a
primary valve disposed in a control panel located on the outside of
a steel housing of a change over station (COS) to an on state which
causes compressed gas from compressed gas cylinders inside the
housing to flow through a first flow path of plumbing in the steel
housing into the chamber of the housing and create positive
pressure in the chamber relative to the mine environment; opening a
door of the housing which activates a door activated switch that
causes compressed gas from the compressed gas cylinders to flow
through a third flow path of the plumbing into the chamber of the
housing and add to the flow through the first flow path of
compressed gas into the chamber to increase the positive pressure
in the chamber and to direct gas flow out of the chamber and
through the open door; miners entering the chamber through the
door, the miners taking SCSRs or SCBAs from a storage portion in
the housing and the miners using the SCSRs or SCBAs; closing the
door of the housing which deactivates the door activated switch
stopping compressed gas flow through the third flow path; and
turning the primary valve to a standby state which causes the
compressed gas from the compressed gas cylinders to flow through a
second flow path of the plumbing into the chamber and a flow rate
that is less than the rate of flow of compressed gas through the
first flow path.
18. The method of claim 17 including the step of the miners
communicating from inside the chamber with a location outside of
the chamber.
19. The method of claim 17 including the steps of the miners
leaving the COS and going to a refuge shelter and entering the
refuge shelter.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This is a nonprovisional application of U.S. provisional
application Ser. No. 61/827,348 filed May 24, 2013, incorporated by
reference herein.
FIELD OF THE INVENTION
[0002] The present invention is related to a change over station in
which miners enter to escape the mine environment and access
supplies. (As used herein, references to the "present invention" or
"invention" relate to exemplary embodiments and not necessarily to
every embodiment encompassed by the appended claims.) More
specifically, the present invention is related to a change over
station in which miners enter to escape the mine environment and
access supplies while in a chamber of a steel housing that is
maintained with positive pressure from pressurized air to keep the
mine environment out of the chamber.
BACKGROUND OF THE INVENTION
[0003] This section is intended to introduce the reader to various
aspects of the art that may be related to various aspects of the
present invention. The following discussion is intended to provide
information to facilitate a better understanding of the present
invention. Accordingly, it should be understood that statements in
the following discussion are to be read in this light, and not as
admissions of prior art.
[0004] Miners carry on themselves SCSRs/SCBAs that have a minimal
amount of oxygen. In case of an emergency, miners will put these
SCSRs/SCBAs on to breathe fresh oxygen. In case miners are far from
the mine face, they have stations that store SCSR's/SCBA's. These
stations do not allow for the miners to escape the mine environment
to change their used SCSRs/SCBAs. There is a need to provide
protection to miners from the mine environment while they change
their SCSRs/SCBAs, and possibly regroup to figure out a way to save
themselves, whether it be to identify a path to escape from the
mine or to access and deploy a refuge shelter in the mine if there
is no viable path to escape the mine.
BRIEF SUMMARY OF THE INVENTION
[0005] The main purpose of the COS is the storage of SCSR's and/or
SCBA's. Also, to provide miners a clean environment to change out
their SCSR's/SCBA's. This is NOT intended to be a REFUGE CHAMBER
and is not a refuge chamber as defined by 30 Code of Federal
Regulations Part 7 (30 CFR Part 7).
[0006] The present invention pertains to a change over station
(COS) for persons in a hazardous environment. The COS comprises a
steel housing having only a single door, a chamber, and an air lock
portion. The door opening to the air lock portion. The air lock
portion connected to the chamber. The COS comprises a first
elongate seat disposed in the chamber. The COS comprises a
plurality of compressed gas cylinders, such as air, cylinders,
disposed in the seat. The COS comprises plumbing connected to the
air cylinders formed of gas lines, such as air lines 28, and valves
and an exhaust muffler, including a first gas, such as air path
through the lines that provides a continuous flow of air into the
chamber through the muffler at a rate of greater than 4 cfm when
the plumbing is in an on state, a second gas, such as air, path
through the lines that provides a continuous flow of air into the
chamber through the muffler at a rate of less than 1.5 cfm when the
plumbing is in a standby state, and a third gas, such as air, path
through the lines which is door activated when the door is opened
by a door activated switch which provides additional air flow as
long as the door is open at a rate of greater than 4 cfm into the
chamber through the . The COS comprises a valve control panel
through which the plumbing extends and which is disposed on the
outside of the housing which controls whether the plumbing is in
the on state or the standby s. The COS comprises a storage portion
44 disposed in the housing having supplies, including water and
SCSRs or SCBAs.
[0007] The present invention pertains to a method for providing a
protected environment to miners from a mine environment in a mine.
The method comprises the steps of opening a primary valve disposed
in a control panel located on the outside of a steel housing of a
change over station (COS) to an on state which causes compressed
air from compressed air cylinders inside the housing to flow
through a first flow path of plumbing in the steel housing into the
chamber of the housing and create positive pressure in the chamber
relative to the mine environment. There is the step of opening a
door of the housing which activates a door activated switch that
causes compressed air from the compressed air cylinders to flow
through a third flow path of the plumbing into the chamber of the
housing and add to the flow through the first flow path of
compressed air into the chamber to increase the positive pressure
in the chamber and to direct air flow out of the chamber and
through the open door. There is the step of miners entering the
chamber through the door, the miners taking SCSRs or SCBAs from a
storage portion 44 in the housing and the miners using the SCSRs or
SCBAs. There is the step of closing the door of the housing which
deactivates the door activated switch stopping compressed air flow
through the third flow path. There is the step of turning the
primary valve to a standby state which causes the compressed air
from the compressed air cylinders to flow through a second flow
path of the plumbing into the chamber and a flow rate that is less
than the rate of flow of compressed air through the first flow
path.
[0008] BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
[0009] In the accompanying drawings, the preferred embodiment of
the invention and preferred methods of practicing the invention are
illustrated in which:
[0010] FIG. 1 is a plumbing schematic of a first embodiment of the
present invention.
[0011] FIG. 2 is a second schematic of the plumbing of the present
invention.
[0012] FIGS. 3a, 3b and 3c show the top, side and front views,
respectively, of the supply air control panel of the second
embodiment of the present invention.
[0013] FIGS. 4-8 are left front perspective, right front
perspective, right front perspective, overhead, and right front
perspective views, respectively, of the change over station of the
present invention.
[0014] FIG. 9 shows a portion of the door, door frame, and door
activated switch.
DETAILED DESCRIPTION OF THE INVENTION
[0015] Referring now to the drawings wherein like reference
numerals refer to similar or identical parts throughout the several
views, and more specifically to FIG. 5 thereof, there is shown a
change over station (COS) 10 for persons in a hazardous
environment. The COS 10 comprises a steel housing 12 having only a
single door 14, a chamber 16, and an air lock portion 20. The door
14 opening to the air lock portion 20. The air lock portion 20
connected to the chamber 16. The COS 10 comprises a first elongate
seat 24 disposed in the chamber 16. The COS 10 comprises a
plurality of compressed air cylinders 22 disposed in the seat, as
shown in FIG. 7. The COS 10 comprises plumbing 26, as shown in FIG.
1, connected to the air cylinders 22 formed of air lines 28 and
valves 30 and an exhaust muffler 32. The plumbing 26 includes a
first air path 34 through the lines that provides a continuous flow
or air into the chamber 16 through the muffler 32 at a rate of
greater than 4 cfm when the plumbing 26 is in an on state, a second
air path 36 through the lines that provides a continuous flow of
air into the chamber 16 through the muffler 32 at a rate of less
than 1.5 cfm when the plumbing 26 is in a standby state, and a
third air path 38 through the lines which is door activated when
the door 14 is opened by a door activated switch 40 which provides
additional air flow as long as the door 14 is open at a rate of
greater than 4 cfm into the chamber 16 through the muffler 32. The
COS 10 comprises a valve control panel 42, as shown in FIG. 3a,
through which the plumbing 26 extends and which is disposed on the
outside of the housing 12 which controls whether the plumbing 26 is
in the on state or the standby state. The COS 10 comprises a
storage portion 44 disposed in the housing 12 having supplies,
including water and SCSRs or SCBAs 18.
[0016] The plumbing 26 may include a primary valve 46 that controls
whether air from the air cylinders 22 follows the first path or the
second path. The primary valve 46 may be a 3 way valve 48, Off, On,
and Standby:
[0017] a. Off--off
[0018] b. On--chamber is ready for entry.
[0019] c. Standby-chamber is activated with a trickle purge to keep
the chamber clear of harmful gas after a first entry until a
subsequent group arrives at the COS 10.
[0020] The plumbing 26 through the first path and the second path
may create positive pressure to keep contaminants out when the door
14 is open. The door activated switch 40 at the door 14 may
activate a secondary valve 50, such as a door activated valve, of
the plumbing 26 that increases air flow rate into the chamber 16
and blows air out the open door 14. The chamber 16 may have a net
height of 60'' and the housing 12 has a flat top 52 to maximize
interior head room. The seat height may be about 16'' to allow for
a 6' person to sit upright in the chamber 16.
[0021] The housing 12 may be approximately 12' long and narrow
enough that it fits in a shipping container; 3 units in a 40'
container. The COS 10 may handle 3 sequenced 10 man change over for
a total of 10 men. The COS 10 may include a second elongate seat
54, as shown in FIG. 4, and wherein each seat provides 24''of space
per man, and the seats provide air cylinder storage for up to 8
cylinders 22 is available. The storage portion 44 may serve as
storage for 30 SCSRs 18 as well as 90 quarts of water. The plumbing
26 may include an orifice 56 and compressed air flow control 58
would be facilitated via the orifice 56.
[0022] The space under the seats may allow for up to 8 cylinders 22
or a maximum of 4 hours in the ON mode, the standby mode
substantially extends the reserve time by only releasing a trickle
flow to maintain a slight positive pressure. The storage portion 44
of the water and SCSRs 18 are left and right just inside the door
14 for easy access. The COS 10 may include hanging plastic curtain
strips 60 to help isolate the COS 10 atmosphere from the mine. The
control panel may be recessed to prevent damage and may be provided
with a tamper evident seal 62.
[0023] The present invention pertains to a method for providing a
protected environment to miners from a mine environment in a mine.
The method comprises the steps of opening a primary valve 46
disposed in a control panel 42 located on the outside of a steel
housing 12 of a change over station (COS) 10 to an on state which
causes compressed air from compressed air cylinders 22 inside the
housing 12 to flow through a first flow path of plumbing 26 in the
steel housing 12 into the chamber 16 of the housing 12 and create
positive pressure in the chamber 16 relative to the mine
environment. There is the step of opening a door 14 of the housing
12 which activates a door activated switch 40 that causes
compressed air from the compressed air cylinders 22 to flow through
a third flow path of the plumbing 26 into the chamber 16 of the
housing 12 and add to the flow through the first flow path of
compressed air into the chamber 16 to increase the positive
pressure in the chamber 16 and to direct air flow out of the
chamber 16 and through the open door 14. There is the step of
miners entering the chamber 16 through the door 14, the miners
taking SCSRs or SCBAs 18 from a storage portion 44 in the housing
12 and the miners using the SCSRs or SCBAs 18. There is the step of
closing the door 14 of the housing 12 which deactivates the door
activated switch 40 stopping compressed air flow through the third
air path 38. There is the step of turning the primary valve 46 to a
standby state which causes the compressed air from the compressed
air cylinders 22 to flow through a second air path 36 of the
plumbing 26 into the chamber 16 and a flow rate that is less than
the rate of flow of compressed air through the first air path
34.
[0024] There may be the step of the miners communicating from
inside the chamber 16 with a location outside of the chamber 16.
The miners may utilize communication devices they typically carry
on them with the Commtrac system available from Strata Products
Worldwide, and/or the Through the Earth Communication System also
available from Strata Products Worldwide and described in U.S.
patent application Ser. No. 13/743,947, incorporated by reference
herein. There may be the steps of the miners leaving the COS 10 and
going to a refuge shelter and entering the refuge shelter.
[0025] In the operation of the invention, the change over station
(COS) 10 provides miners an escape from the mine environment, which
will allow the miners to safely change their used SCSRs/SCBAs 18 to
new ones and have time to possibly regroup and plan a response to
the emergency in a relatively safe environment out of the mine
environment. The change over station 10 is a walk in steel chamber
16 that will have the capacity to store at least 30 SCSRs 18 or 30
SCBSs 18. The change over station 10 will also have the capability
to store up to 90 quarts of water for the miners to re-hydrate
themselves.
[0026] The change over station 10 has the capability to handle 3
sequenced 10 men change overs for a total of 30 people. To create a
clean environment, compressed air will be released inside the
chamber 16 of the COS, which will create a positive pressure inside
the chamber 16 and allow breathable air inside the chamber 16.
According to calculations 1-4.5K bottle of compressed air will
allow 10 men to exist an hour in the chamber 16. This will be
increased to two cylinders 22 as a safety factor. The change over
station 10 has the capacity to store 8-4.5K compressed air
cylinders 22, to make the overall run time of the chamber 16 when
activated last approximately 4 hours. This is believed to be more
than enough time for the miners to resupply themselves, given the
emergency circumstances, and make a decision to try to escape the
mine or go to and access and deploy and enter a refuge shelter that
provides long term life support, typically at least 96 hours. An
example of a refuge shelter is that sold by Strata Products
Worldwide, LLC identified as the Fresh Air Bay; see U.S. patent
application Ser. No. 13/460252, incorporated by reference
herein.
[0027] FIGS. 4-8 show different views of the change over station 10
with the roof removed for better depiction. FIG. 5 shows a front
perspective view of the change over station 10 with the single door
14 shut. The door 14 opens outward from the steel chamber 16. FIGS.
4 and 6 show a front perspective view of the change over station 10
with the door 14 open. FIG. 7 shows an overhead view of the change
over station 10. The steel housing 12 is of a fixed size and is
comprised of four walls, the base from which the four walls extend
and a roof. The bench seats are on either side of the change over
station 10. A portion of the top of the bench is cut away on each
side to reveal the pressurized tanks stored within the benches.
FIG. 8 shows a perspective view of the change over station 10 with
the roof 63 in place.
[0028] In the front of the change over station 10, adjacent the
door 14 is the air lock portion 20 and also shelving 66 and storage
areas 44 to hold the various supplies mentioned above. FIG. 6 shows
a left perspective view of the change over station 10 with the door
14 open and showing the shelving 66 and storage areas 44 in the
front of the change over station 10. In the upper front right
corner looking from the outside toward the front door 14 is the
pressure relief valve 92. The air lock 20 is separated from the
main part of the chamber 16 where the benches are located by
plastic strips 60 that hang from the ceiling which act to contain
flow of the mine environment into the change over station 10 when
the door 14 is open.
[0029] The structure of the change over station 10 is built out of
steel tubing and sheet metal having a rectangular shape with the
walls, floor and roof being rectangular shaped plates that are
welded together. The overall dimensions of the structure are 144
in.times.80 in.times.60 in (L.times.W.times.H). The structure of
the change over station 10 is built on the same base as the ERC
sold by Strata Safety Products, the difference is the height of the
COS being at a maximum of 5 ft. The height is to fit inside coal
mines. There are benches inside of the chamber 16 for the miners to
sit. The benches are a height that will allow a 6 ft tall person to
sit comfortably inside the chamber 16.
[0030] In regard to the plumbing 26 and airflow, reference is made
to FIG. 1. In one embodiment, each of 2-8 4.5 k compressed air
cylinders 22 are connected in parallel through each cylinder's
Monet valve 64 to a pressurized gas line. The gas line carrying the
compressed air from the air cylinders 22 connects to a system valve
68. The system valve 68 controls the airflow through the gas line
from the air cylinders 22 in total, either on or off. The system
valve 68 is off during construction, but once construction is
complete and the air cylinders 22 are connected to the gas line and
the change over station 10 is ready for operation and to be
delivered to a mine, the system valve 68 is turned on and
pressurized gas is allowed to flow through the system valve 68.
This is an always on system. A bottle pressure gauge is connected
to the line between the cylinders 22 and the system valve 68 for
verification purposes each working shift.
[0031] The gas line extends from the system valve 68, a Parker
Veriflo HCV Valve with HP Gauge, to a step down valve 70, a Parker
Veriflo Two Stage Pressure Regulator IR 6004 Outlet Range 10-250
PSIG, which takes the 4.5 k PSI pressure in the line down to a
workable pressure of about 100 PSI for downstream valves 30. The
gas line extends from the step down valve 70 where it splits and
extends to a door activated switch 40, such as a Parker Veriflo
Door Activated 2 Position 3 Way Directional Valve P/N 47000074, and
door activated valve, such as a Parker Veriflo NV17 AOP Valve, and
the primary valve 46, such as a three way valve 48 or a position
valve 48, Parker Veriflo NV17 Indicator Valve, which can either be
off, on or in standby.
[0032] The position valve 48 is maintained in an off position until
miners need to use the change over station 10. In the off position,
the position valve 48 prevents any flow of pressurized air through
it. When miners need to use the change over station 10, they cause
the position valve 48 to be turned to the on position. The position
valve 48 is controlled from the outside of the change over station
10, before the miners enter the change over station 10. In the on
position, flow of pressurized air flows through the position valve
48 and a 6.48 CFM orifice 56 and out into the chamber of the change
over station 10 through the gas line that extends to a muffler 32
exhaust, such as a Parker Veriflo Muffler P/N 47000075, located in
the rear of the chamber. By turning the position of the position
valve 48 to on before the miners enter the chamber, positive
pressure is created to limit or prevent the gas from the mine
environment to enter the change over station 10. When miners vacate
the chamber, they turn the position valve 48 to the standby
position which allows a continuous flow of air to flow through the
position valve 48 and through a 0.6 CFM orifice 56 through the gas
line to the muffler 32 exhaust. In the standby position, air
continues to enter the chamber but at a much reduced rate, waiting
for any miners that might need it at a subsequent time to enter the
chamber with positive pressure still maintained, but at a low
enough rate to extend the duration of the viability of the change
over station 10.
[0033] From the step down valve 70, the gas line also extends to a
door activated valve through a door activated switch 40. The door
activated valve allows pressurized air to merge with the air from
the position valve 48 and pass into the chamber through the muffler
32 exhaust. When the door activated switch 40 is open, the
pressurized gas passes through the switch 40 and through the door
activated valve to a 6.48 CFM orifice 56 in the gas line extending
from the door activated valve to the muffler 32 exhaust. The door
activated switch 40 is just that; whenever the door 14 is open any
amount, the door activated switch 40 is open and allows gas
pressure to pass through the gas line to the door activated valve
and into the chamber through the muffler 32 exhaust. If the
position valve 48 is also open, then essentially the gas through
the gas line of the door activated valve doubles the flow rate of
air into the chamber. The door activated valve opens when air
passes to it from the switch 40 but prevents air flow in the
opposite direct in from the muffler 32 back to the switch 40. In
this way, whenever the door 14 is open to any degree, increased
airflow is applied to the chamber to maintain positive pressure and
keep out the mine environment.
[0034] The door activated switch 40, as shown in FIG. 2, has a
button 80 that is positioned in the door frame 82 at the hinge 86
side of the door 14, as shown in FIG. 9. The button 80 is spring
loaded so that when the door 14 becomes even slightly ajar, and a
space is created between the door 14 and the frame, the button 80
will move out under the action of the spring 84, drawing a stem 88
of the button 80 which extends into a flow channel 90 through the
switch 40, out of the flow channel 90, allowing air to flow through
the flow channel 90 in the switch 40 and to the door activated
valve 50. The air then flows through the door activated valve 50
and through the line to the exhaust muffler 32. When the door 14
becomes closed, the door 14 pushes down on the button 80, directing
the stem 88 back into the flow channel 90, which closes the switch
40 and stops air flow to the door operated valve. The 6.48 CFM
orifice 56 downstream from the door activated valve allows air flow
at 6.48 cfm from the door activated switch 40 to the muffler
32.
[0035] As a safety measure, a pressure relief valve 92 is located
in the upper right rear corner of the steel chamber 16 to allow any
excess air pressure to vent from the chamber, if necessary, as
shown in FIG. 4. In a preferred embodiment, there is no CO2
scrubber in the change over station to remove carbon dioxide. The
positive pressure maintained in the change over station 10 and
constant flow of air into the chamber 16 effectively pushes out or
keeps out toxic gases such as carbon dioxide while the miners are
in the change over station, which is less than an hour or two
hours, long enough for the miners to resupply themselves, have a
short rest and make a determination where they will go next in the
mine.
[0036] In another embodiment, FIG. 2 shows a plumbing schematic and
FIGS. 3a , 3 and 3c show an overhead view, side view and front
view, respectively, of the control panel 42. This schematic of the
plumbing layout is slightly different then the layout of FIG. 1 and
essentially operates the same way except as follows. From the
plumbing schematic, the air flow from the cylinders 22 will go to
the system valve 68, a Parker Veriflo HCV Valve with HP Gauge. The
flow stops there until that valve 68 is turned on. What that means
is that this is an always off system until the initial valve 68 is
turned on. Once, the valve 68 is turned on, the flow then can take
two directions.
[0037] 1) The flow can go to the primary valve 46, a Parker Veriflo
NV17 Indicator Valve (`On`/`Stand-By` Valve) and
[0038] 2) The flow can go to the secondary valve, a Parker Veriflo
Door Activated 2 Position 3 Way Normally Closed switch
[0039] In the panel 42 shown in FIGS. 1,2 and 3a-3c, the miners
will be told by written instructions to turn the Parker Veriflo NV
17 Indicator Primary Valve 46 to the `On" position, so initially
the flow will go through that valve 46 and through a 6.48 CFM
orifice 56 to the muffler 32. Once, the miners open the door 14 to
go into the chamber 16, the Parker Veriflo Door Activated Switch 40
will be activated and the flow of air will also be directed through
the switch 40 to the Parker Veriflo NV17 AOP Secondary Valve 50 and
through a 6.48 CFM orifice 56 to join the flow of air flowing
through the Parker Veriflo NV17 Indicator Primary Valve 46 and
exhaust at a total flow rate of about 13 cfm. The switch 40 and the
AOP Secondary Valve 50 work the same way as the switch 40 and door
activated valve described above.
[0040] After all the miners enter the COS, the door 14 will be shut
and the switch 40 closed, The flow of air will then only flow to
the Parker Veriflo NV17 Indicator Primary Valve through the `On"
position and the flow will be 6.48 cfm out the muffler 32. Once the
miners exit the COS, they will go back to the control panel and
turn the Parker Veriflo NV17 Indicator Primary Valve to `Stand-By`
and then the flow to the exhaust will be 0.6 cfm.
[0041] From the Control Panel, step by step what miners would
do:
[0042] 1) Turn `ON` the Parker Veriflo HCV System Valve with HP
Gauge (far left valve on drawing panel FIG. 2)
[0043] 2) Turn the Parker Veriflo NV17 Indicator Primary Valve to
the `ON` Position (far right valve in middle on drawing panel FIG.
2)
[0044] 3) Open Entry Door and enter the COS: [0045] a. Where the
mechanically operated Parker Veriflo Door Activated
[0046] Switch will be activated, miners don't have to know about
this because they will not have to turn or activate this switch
[0047] 4) Close Entry Door once everyone has entered the COS [0048]
a. Where the mechanically operated Parker Veriflo Activated Switch
will be deactivated
[0049] 5) After miners exit Close Entry Door and go over to the
Valve panel and turn the Parker Veriflo NV17 Indicator Primary
Valve to `Stand-By`
[0050] These steps will be a continuous loop until all the air is
exhausted from the compressed air cylinders 22 or all the miners
have been to the COS.
[0051] Although the invention has been described in detail in the
foregoing embodiments for the purpose of illustration, it is to be
understood that such detail is solely for that purpose and that
variations can be made therein by those skilled in the art without
departing from the spirit and scope of the invention except as it
may be described by the following claims.
* * * * *