US3918890A - Auxiliary operators for slide dampers - Google Patents

Auxiliary operators for slide dampers Download PDF

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US3918890A
US3918890A US484417A US48441774A US3918890A US 3918890 A US3918890 A US 3918890A US 484417 A US484417 A US 484417A US 48441774 A US48441774 A US 48441774A US 3918890 A US3918890 A US 3918890A
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Prior art keywords
slide damper
stack
damper
air
ejector
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US484417A
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John C Blaine
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Pilkington North America Inc
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Libbey Owens Ford Co
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Assigned to LOF GLASS, INC. reassignment LOF GLASS, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LIBBEY-OWENS-FORD COMPANY AN OH. CORP.
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00Actuating devices; Operating means; Releasing devices
    • F16K31/44Mechanical actuating means
    • F16K31/53Mechanical actuating means with toothed gearing
    • F16K31/54Mechanical actuating means with toothed gearing with pinion and rack
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B9/00Stoves for heating the blast in blast furnaces
    • C21B9/10Other details, e.g. blast mains
    • C21B9/12Hot-blast valves or slides for blast furnaces
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/5544Reversing valves - regenerative furnace type

Definitions

  • ABSTRACT A manually operable auxiliary apparatus for moving a slide damper in an ejector stack having a reciprocating arm movable in a linear path. One end of the arm is detachably connected to an end of the slide damper for pushing or pulling the damper between open and closed positions. Movement of the reciprocating arm is provided by a force multiplying device whereby an operator can easily and conveniently manually move the damper between its open and closed positions when the primary operating means for moving the damper is inoperative.
  • This invention relates to furnace control apparatus and, more'particularly, to auxiliary apparatus for controlling the fl'ow of combustion air and hot waste gases to and from regenerative type furnaces.
  • two series of ports are alternately operated independently'of each other so that first one series of ports is fired andthe opposite series exhausts that hot waste gases. Then, at periodic intervals of about to minutes, the operatihg condition of the two series of ports is reVe rsedQthat is, the ports being fired serve as the exhaust ports and the ports exhausting the hot waste gases serve as the firing ports. Also, it should be noted that the average campaign of such a furnace is about five y s-
  • One well known system for controlling the flow of combustion-air and hot waste gases employs two ejector stacks wherein one of the stacks is connected tothe regenerators associated with one series of ports and the other stack is connected to the regenerators associated with the other'series of ports.
  • Air is supplied under pressure to each ejector stack and means is provided whereby the supplied air may serve either as eject'or air to withdraw hot waste gases from one seriesof ports through its regenerators, or as combustion air which will first flow inwardly through the other series of regenerators and its associated series of ports.
  • the reversing mechanism employed in such a system comprises a reversing valve for directing combustion air to one stack and ejector air to the other stack, in combination with twodarnpers wherein one damper is associated with, one ejector stack and the other damper is associated with the other ejector stack, which dampers alternately close and open the stacks to the atmosphere.
  • the dampers associated with the ejector stacks are normally. slide valveswhich, because of their size and weight, are conventionally operated by fluid power motors of the piston type.
  • each slide damper is disabled by providing each slide damper with an auxiliary operating apparatus.
  • the end of each slide damper opposite its connection with the fluid motor is provided with a horizontally extending bail for connection to a force multiplying device.
  • the device comprises a rack and pinion mechanism mounted on and externally of the ejector stack by a bracket wherein the pinion is adapted to be rotated by a manually operable reversible ratchet type wrench for linear movement of the rack.
  • One end of the rack is provided with a T-shaped slot for connection to the bail, and it may be provided with a latch for locking the bail within the slot.
  • Another object of this invention is to provide an auxiliary damper operating apparatus with a force multiplying device whereby one person can easily and conveniently move a large and heavy slide damper from one position to another.
  • FIG. 1 is a side elevational view of a forced draft system for acontinuous tank melting furnace embodying this invention
  • FIG. 2 is a top plan view of the system shown in FIG.
  • FIG. 3 is a cross sectional view, taken substantially along line 3-3 in FIG. 2, of the slide damper in the ejectorstack associated with this invention
  • FIG. 4 is a top plan view of the slide damper shown in FIG. 3;
  • FIG. 5 is an enlarged fragmentary perspective view of the auxiliary damper operating apparatus constructed in accordance with thisinvention.
  • FIG. 6 is an enlarged fragmentary view of the detachable connection employed to connect the operating apparatus to the slide damper.
  • DESCRIPTION OF THE PREFERRED EMBODIMENTS ting nozzles 26 and 26' are mounted in the chambers 22 and 22'. These nozzles are connected by horizontal ducts 27 and 27' to a chamber 28 containing a revers- 3 ing valve 29 which alternately connects the ducts to a source of ejection air and a source of combustion air.
  • An air fan 30, driven by a motor 31 delivers ejection air through a duct 32 to the chamber 28.
  • Another air fan 33 driven by a motor 34 delivers combustion air through a duct 35 to the chamber 28.
  • the combustion air fan 33 may be used to supply air inwardly through either of the secondary regenerators 21 or 21 to supply heated combustion air to the glass melting furnace in a known manner, while the ejector air fan supplies air for the withdrawal of hot waste gases outwardly through the other regenerator and the ejection of these gases to the atmosphere.
  • the damper 25 open, the damper 25 closed and the reversing valve 29 directing ejection air through the open ejector stack 23, combustion air will flow through the duct 27' into the inlet chamber 22 and thence downwardly through the secondary regenerator 21 which preheats the air being delivered to the primary regenerators of the glass melting furnace.
  • the combustion air will then flow downwardly through the secndary regenerator 21 while the ejection air will flow upwardly through the stack 23' and withdraw hot waste gases upwardly through the regenerator 21
  • the fan 33 is suitably adjusted to supply air at the rate required for efficient combustion of the fuel firing the furnace, and the fan 30 is suitably adjusted to supply air at the rate required to maintain the pressure within the furnace at a desired value.
  • the slide damper 25 comprises a substantially flat plate member 36 movably contained in a housing 37 which connects the throat 24 of the ejector stack 23 to the top of the inlet chamber 22.
  • the housing 37 comprises an open annular section 38 which provides a passageway 39 between the ejector stack 23 and the inlet chamber 22, and an enclosed casing section 40 for receiving the plate member 36 when it is moved to a position to open the passageway 39.
  • the plate member 36 is configured to co-operate with the annular section 38 of the housing 37 to close the passageway 39 and is normally composed of cast iron to withstand the high operating temperatures required in the glass melting operation.
  • the passageway is approximately five feet in diameter and thus, the plate member 36 is very large and heavy.
  • the damper 25 is shown in its closed position. That is, the plate member 36 overlies the passageway 39 and shuts the inlet chamber 22 from the ejector stack 23.
  • the plate member 36 is supported on a slideway 41 which surrounds the passageway 39 in the open annular section 38.
  • the plate member 36 is slidably movable along the slideway 41 onto slideway 42 (only one shown) provided in the enclosed casing section 40 to open the passageway 39 for the flow of air therethrough. Since the plate member 36 is of large size and considerable weight, it is normally 4 moved by a power cylinder such as a piston type fluid motor 43.
  • the motor includes a cylinder 44 having a piston (not shown) therein connected to a piston rod 45, the end of the latter being connected by a pin 46 attached to one end of the plate member 36 in a conventional manner.
  • the slide damper 25 is provided with a manually operable operable auxiliary operating apparatus generally indicated by the numeral 47, so that one person can conveniently and easily move the slide damper between its open and closed po sitions when failure of the power motor 43 occurs.
  • the apparatus 47 generally comprises a reciprocating means 48 such as an arm which is movable along a linear path by a force multiplying device such as a gear mechanism.
  • the reciprocating arm is provided with means for detachably connecting it to the slide damper 36.
  • the reciprocating means 48 of the invention generally comprises a rack 49 supported within an open bracket 50 on a longitudinally extending slide bar 51.
  • the open bracket 50 is provided with a pair of parallel vertical side plates 52 and 53 arranged in spaced apart relation by the slide bar 51 and secured together by bolts 54 (only one shown).
  • the rack 49 extends along the slide bar 51 with its teeth 55 in mesh with the teeth 56 of a pinion gear 57.
  • the pinion gear is fixedly attached to a shaft 58 rotatab'ly mounted in the side plates 52 and 53.
  • a hexagonally shaped member or nut 59 is keyed as at 60 to one end of the shaft 58 for a purpose which will be described hereinafter.
  • the rack 49 is supported in substantially the same horizontal plane that the plate member 36 lies in by mounting the bracket 50 on and adjacent to the top end of the inlet chamber 22 so that the rack may pass through an aperture 61 provided in the wall of the annular housing section 38 for connecting it to the internally located plate member 36.
  • the bracket 50 is externally mounted on the chamber 22 by a pivotal connection and a supporting leg.
  • the pivotal connection may include an anchor leaf 62 fixedly secured to a rib 63 forming part of the inlet chamber 22, the side plates 52 and 53 of the bracket 50, and a headed pivot pin 64. As shown in FIG.
  • the supporting leg may comprise a leg member 66 which extends between the bracket 50 and the wall of the inlet chamber 22. Still referring to FIG. 5, one end of the leg 66 projects between the side plates 52 and 53 and is connected thereto by a bolt and nut indicated by the reference character 67. The other end of the leg 66 projects between a pair of upstanding plates 68 fixedly secured to the wall of the inlet chamber and is connected thereto by a similar bolt and nut 67.
  • the entire device 47 may be removed when not in use so as to be out of the way, and quickly attached in case of an emergency.
  • the end of the rack 49 is provided with an inverted T-shaped slot 69 for attachment to a bail pin 70 attached to the end of the plate member 36 by a pair of projecting members 71.
  • a pivotal latch 72 is provided across the open leg of the T- shaped slot 69 to detachably lock the bail pin 70 within the T-shaped slot.
  • the connection between the rack 49 and the plate 36 may be made within the interior of the housing 37 by inserting the coupling end of the rack through the apertures 61, engaging the slot 69 with the bail pin 70 and closing the pivotal latch 72.
  • a reversible ratchet wrench 73 having a hexagonal socket for receiving the member 59 is provided for manually rotating the pinion gear 57 in either ofits directions of rotation.
  • the handle 74 of the wrench 73 is of such length that it provides a mechanical advantage to easily rotate the pinion gear 57 and pull or push the plate 36 between its open and closed positions, respectively.
  • a reversing forced draft glass melting furnace of the type having a pair of regenerators adapted for periodic cycling, an ejector stack connected to each regenerator, an ejector nozzle mounted in each said stack, a reversing valve periodically and alternately communicating said nozzles with a source of combustion air and a source of ejection air, a slide damper associated with each said stack above each said nozzle to direct the flow of air in each said stack, a power means for automatically and periodically operating each said slide damper in conjunction with said reversing valve, the improvement comprising auxiliary operators for moving each said slide damper between open and closed positions and wherein each said auxiliary operator includes:

Abstract

A manually operable auxiliary apparatus for moving a slide damper in an ejector stack having a reciprocating arm movable in a linear path. One end of the arm is detachably connected to an end of the slide damper for pushing or pulling the damper between open and closed positions. Movement of the reciprocating arm is provided by a force multiplying device whereby an operator can easily and conveniently manually move the damper between its open and closed positions when the primary operating means for moving the damper is inoperative.

Description

United States Patent [191 Blaine Nov. 11, 1975 1 AUXILIARY OPERATORS FOR SLIDE DAMPERS [75] Inventor: John C. Blaine, Ottawa, 111.
[73] Assignee: Libbey-Owens-Ford Company, Toledo, Ohio 22 Filed: July 1, 1974 [21] Appl. No.: 484,417
[52] US. Cl. 432/54; 137/309; 432/181 [51] Int. Cl.' C21B 9/12; F16K 11/00 [58] Field of Search 432/17, 54, 161, 177, 180, 432/181, 185, 212, 222; 126/285 R, 285 A;
[56] References Cited UNITED STATES PATENTS 610.076 8/1898 McClure 126/285 21 1,762,299 6/1930 lsley 1 432/54 1.900.396 3/1933 lsley et al... 432/l8l 2,098,553 11/1937 Reiner 137/309 2,175,063 10/1939 Merkt 432/54 2,795,409 6/1957 3,051,462 8/1962 Fennell 432/180 3,184,223 5/1965 Webber 432/54 Primary E.\'(U7lllllf,l0hll J. Camby Assistant E.\'uminerHenry C. Yuen Attorney, Agenl, 0r FirmCollins, Oberlin & Darr [57] ABSTRACT A manually operable auxiliary apparatus for moving a slide damper in an ejector stack having a reciprocating arm movable in a linear path. One end of the arm is detachably connected to an end of the slide damper for pushing or pulling the damper between open and closed positions. Movement of the reciprocating arm is provided by a force multiplying device whereby an operator can easily and conveniently manually move the damper between its open and closed positions when the primary operating means for moving the damper is inoperative.
2 Claims, 6 Drawing Figures US. Patent Nov. 11, 1975 Sheet 2 of3 w-um mw 1. QY
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US. Patent Nov; 11, 1975 Sheet 3 013 3,918,890
FIG. 6
AUXILIARY OPERATORS FOR SLIDE DAMPERS BACKGROUND OF THE INVENTION l. Fieldof the Invention This invention relates to furnace control apparatus and, more'particularly, to auxiliary apparatus for controlling the fl'ow of combustion air and hot waste gases to and from regenerative type furnaces.
2. Descriptionfof the Prior Art As is well known, flat glass is produced in a continuous tank-type melting furnace wherein raw batch materials arecontinuously delivered to the charging end of the furnace, melted and refined as they move through the fur-nace,.and then withdrawn from its delivery end as a continuous-ribbon. In furnaces of this type, heat for melting the raw batch is introduced through ports arranged-in alongitudinal series along each opposed longitudinal'side wall, the ports leading to sources of supply of fuel-andpreheated air. The combustion air obtains its preheat from the hot waste gases which have previously passed through the checkerwork of the regenerators'as'sociated with the ports being fired. The
two series of ports are alternately operated independently'of each other so that first one series of ports is fired andthe opposite series exhausts that hot waste gases. Then, at periodic intervals of about to minutes, the operatihg condition of the two series of ports is reVe rsedQthat is, the ports being fired serve as the exhaust ports and the ports exhausting the hot waste gases serve as the firing ports. Also, it should be noted that the average campaign of such a furnace is about five y s- One well known system for controlling the flow of combustion-air and hot waste gases employs two ejector stacks wherein one of the stacks is connected tothe regenerators associated with one series of ports and the other stack is connected to the regenerators associated with the other'series of ports. Air is supplied under pressure to each ejector stack and means is provided whereby the supplied air may serve either as eject'or air to withdraw hot waste gases from one seriesof ports through its regenerators, or as combustion air which will first flow inwardly through the other series of regenerators and its associated series of ports. The reversing mechanism employed in such a system comprises a reversing valve for directing combustion air to one stack and ejector air to the other stack, in combination with twodarnpers wherein one damper is associated with, one ejector stack and the other damper is associated with the other ejector stack, which dampers alternately close and open the stacks to the atmosphere. The dampers associated with the ejector stacks are normally. slide valveswhich, because of their size and weight, are conventionally operated by fluid power motors of the piston type.
As previously indicated, operation of these motors is frequent and,-over. extended periods of time, the extreme-operatingconditions imposed upon the power motors cause extensive wear of their seals and even breakdown of'their component parts necessitating occasional repair or replacement. This creates a major problem in the continuous operation of the. furnace as it is necessary for its proper operation to reverse the dampers.
SUMMARY OF THE INVENTION Generally speaking, the periodic cycling of the fur- .nace is continued when either or both of the fluid mo-.
tors are disabled by providing each slide damper with an auxiliary operating apparatus. In accordance with this invention, the end of each slide damper opposite its connection with the fluid motor is provided with a horizontally extending bail for connection to a force multiplying device. The device comprises a rack and pinion mechanism mounted on and externally of the ejector stack by a bracket wherein the pinion is adapted to be rotated by a manually operable reversible ratchet type wrench for linear movement of the rack. One end of the rack is provided with a T-shaped slot for connection to the bail, and it may be provided with a latch for locking the bail within the slot.
OBJECTS AND ADVANTAGES Accordingly, it is an object of this invention to provide a relatively simple and dependable auxiliary apparatus for manually operating a slide damper when .its primary operation means is disabled.
Another object of this invention is to provide an auxiliary damper operating apparatus with a force multiplying device whereby one person can easily and conveniently move a large and heavy slide damper from one position to another.
Other objects and advantages will become more apparent during the course of the following description when taken in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS In the drawings, wherein like numerals are employed to designate like parts throughout the same:
FIG. 1 is a side elevational view of a forced draft system for acontinuous tank melting furnace embodying this invention;
FIG. 2 is a top plan view of the system shown in FIG.
FIG. 3 is a cross sectional view, taken substantially along line 3-3 in FIG. 2, of the slide damper in the ejectorstack associated with this invention;
- FIG. 4 is a top plan view of the slide damper shown in FIG. 3;
FIG. 5 is an enlarged fragmentary perspective view of the auxiliary damper operating apparatus constructed in accordance with thisinvention; and
FIG. 6 is an enlarged fragmentary view of the detachable connection employed to connect the operating apparatus to the slide damper.
DESCRIPTION OF THE PREFERRED EMBODIMENTS ting nozzles 26 and 26' are mounted in the chambers 22 and 22'. These nozzles are connected by horizontal ducts 27 and 27' to a chamber 28 containing a revers- 3 ing valve 29 which alternately connects the ducts to a source of ejection air and a source of combustion air. An air fan 30, driven by a motor 31, delivers ejection air through a duct 32 to the chamber 28. Another air fan 33 driven by a motor 34, delivers combustion air through a duct 35 to the chamber 28.
In the apparatus thus far described, the combustion air fan 33 may be used to supply air inwardly through either of the secondary regenerators 21 or 21 to supply heated combustion air to the glass melting furnace in a known manner, while the ejector air fan supplies air for the withdrawal of hot waste gases outwardly through the other regenerator and the ejection of these gases to the atmosphere. Thus, with the damper 25 open, the damper 25 closed and the reversing valve 29 directing ejection air through the open ejector stack 23, combustion air will flow through the duct 27' into the inlet chamber 22 and thence downwardly through the secondary regenerator 21 which preheats the air being delivered to the primary regenerators of the glass melting furnace. At the same time the ejection air from the chamber 28 will flow through the duct 27 and thence upwardly through the venturi stack 23, drawing hot waste gases upwardly from the glass melting furnace through the secondary regenerator 21 which will be heated by the hot waste gases passing therethrough. When the flow of air through the furnace is to be reversed, the damper 25 will be closed, the damper 25 opened, and the reversing valve 29 moved to its other position. The combustion air will then flow downwardly through the secndary regenerator 21 while the ejection air will flow upwardly through the stack 23' and withdraw hot waste gases upwardly through the regenerator 21 The fan 33 is suitably adjusted to supply air at the rate required for efficient combustion of the fuel firing the furnace, and the fan 30 is suitably adjusted to supply air at the rate required to maintain the pressure within the furnace at a desired value.
Since the slide dampers 25 and 25 and the operating mechanism are constructed of like parts, a description of one will serve as a description for the other. As indicated in FIG. 1 and clearly shown in FIG. 3, the slide damper 25 comprises a substantially flat plate member 36 movably contained in a housing 37 which connects the throat 24 of the ejector stack 23 to the top of the inlet chamber 22. The housing 37 comprises an open annular section 38 which provides a passageway 39 between the ejector stack 23 and the inlet chamber 22, and an enclosed casing section 40 for receiving the plate member 36 when it is moved to a position to open the passageway 39. The plate member 36 is configured to co-operate with the annular section 38 of the housing 37 to close the passageway 39 and is normally composed of cast iron to withstand the high operating temperatures required in the glass melting operation. The passageway is approximately five feet in diameter and thus, the plate member 36 is very large and heavy.
Referring now to FIGS. 3 and 4, the damper 25 is shown in its closed position. That is, the plate member 36 overlies the passageway 39 and shuts the inlet chamber 22 from the ejector stack 23. The plate member 36 is supported on a slideway 41 which surrounds the passageway 39 in the open annular section 38. The plate member 36 is slidably movable along the slideway 41 onto slideway 42 (only one shown) provided in the enclosed casing section 40 to open the passageway 39 for the flow of air therethrough. Since the plate member 36 is of large size and considerable weight, it is normally 4 moved by a power cylinder such as a piston type fluid motor 43. The motor includes a cylinder 44 having a piston (not shown) therein connected to a piston rod 45, the end of the latter being connected by a pin 46 attached to one end of the plate member 36 in a conventional manner.
As previously indicated, the firing of such a furnace employed in the continuous glass making operation is reversed at periodic intervals of about 20 to 30 minutes and the average campaign of such a furnace is on the order of five years. Thus, it is apparent that the damper operating motor 43 is subjected to frequent and hard use over extended periods of time which occasionally results in its breakdown.
According to the invention, the slide damper 25 is provided with a manually operable operable auxiliary operating apparatus generally indicated by the numeral 47, so that one person can conveniently and easily move the slide damper between its open and closed po sitions when failure of the power motor 43 occurs. The apparatus 47 generally comprises a reciprocating means 48 such as an arm which is movable along a linear path by a force multiplying device such as a gear mechanism. The reciprocating arm is provided with means for detachably connecting it to the slide damper 36.
Referring now to FIG. 5, the reciprocating means 48 of the invention generally comprises a rack 49 supported within an open bracket 50 on a longitudinally extending slide bar 51. The open bracket 50 is provided with a pair of parallel vertical side plates 52 and 53 arranged in spaced apart relation by the slide bar 51 and secured together by bolts 54 (only one shown). The rack 49 extends along the slide bar 51 with its teeth 55 in mesh with the teeth 56 of a pinion gear 57. The pinion gear is fixedly attached to a shaft 58 rotatab'ly mounted in the side plates 52 and 53. A hexagonally shaped member or nut 59 is keyed as at 60 to one end of the shaft 58 for a purpose which will be described hereinafter.
The rack 49 is supported in substantially the same horizontal plane that the plate member 36 lies in by mounting the bracket 50 on and adjacent to the top end of the inlet chamber 22 so that the rack may pass through an aperture 61 provided in the wall of the annular housing section 38 for connecting it to the internally located plate member 36. Thus, as best seen in FIGS. 3 and 5, the bracket 50 is externally mounted on the chamber 22 by a pivotal connection and a supporting leg. The pivotal connection may include an anchor leaf 62 fixedly secured to a rib 63 forming part of the inlet chamber 22, the side plates 52 and 53 of the bracket 50, and a headed pivot pin 64. As shown in FIG. 5, the leaf 62 projects between the side plates 52 and 53 and the pivot pin extends through co-operating apertures provided in the leaf and side plates and is keyed therein by a cotter pin 65. The supporting leg may comprise a leg member 66 which extends between the bracket 50 and the wall of the inlet chamber 22. Still referring to FIG. 5, one end of the leg 66 projects between the side plates 52 and 53 and is connected thereto by a bolt and nut indicated by the reference character 67. The other end of the leg 66 projects between a pair of upstanding plates 68 fixedly secured to the wall of the inlet chamber and is connected thereto by a similar bolt and nut 67. Thus, the entire device 47 may be removed when not in use so as to be out of the way, and quickly attached in case of an emergency.
Referring now to FIG. 6, the end of the rack 49 is provided with an inverted T-shaped slot 69 for attachment to a bail pin 70 attached to the end of the plate member 36 by a pair of projecting members 71. A pivotal latch 72 is provided across the open leg of the T- shaped slot 69 to detachably lock the bail pin 70 within the T-shaped slot. The connection between the rack 49 and the plate 36 may be made within the interior of the housing 37 by inserting the coupling end of the rack through the apertures 61, engaging the slot 69 with the bail pin 70 and closing the pivotal latch 72.
As indicated in FIG. 4 and shown in FIG. 5, a reversible ratchet wrench 73 having a hexagonal socket for receiving the member 59 is provided for manually rotating the pinion gear 57 in either ofits directions of rotation. The handle 74 of the wrench 73 is of such length that it provides a mechanical advantage to easily rotate the pinion gear 57 and pull or push the plate 36 between its open and closed positions, respectively.
It is to be understood that the form of the invention herewith shown and described, is to be taken as an illustrative embodiment only of the same, and that various changes in the shape, size and arrangement of the parts may be resorted to without departing from the spirit of the invention.
1 claim:
1. In a reversing forced draft glass melting furnace of the type having a pair of regenerators adapted for periodic cycling, an ejector stack connected to each regenerator, an ejector nozzle mounted in each said stack, a reversing valve periodically and alternately communicating said nozzles with a source of combustion air and a source of ejection air, a slide damper associated with each said stack above each said nozzle to direct the flow of air in each said stack, a power means for automatically and periodically operating each said slide damper in conjunction with said reversing valve, the improvement comprising auxiliary operators for moving each said slide damper between open and closed positions and wherein each said auxiliary operator includes:
a. means for reciprocating its said slide damper between said open and closed positions in event of failure of said power means and comprising a movable rack;
b. means for mounting said reciprocating means on said ejector stack in substantially the same plane as said slide damper;
c. a manually operable force multiplying device operatively connected to said reciprocating means for imparting movement thereto; and
d. means for detachably connecting said reciprocating means to said slide damper, said detachable connecting means comprising a bail pin affixed to the end of said slide damper, and said rack being

Claims (2)

1. In a reversing forced draft glass melting furnace of the type having a pair of regenerators adapted for periodic cycling, an ejector stack connected to each regenerator, an ejector nozzle mounted in each said stack, a reversing valve periodically and alternately communicating said nozzles with a source of combustion air and a source of ejection air, a slide damper associated with each said stack above each said nozzle to direct the flow of air in each said stack, a power means for automatically and periodically operating each said slide damper in conjunction with said reversing valve, the improvement comprising auxiliary operators for moving each said slide damper between open and closed positions and wherein each said auxiliary operator includes: a. means for reciprocating its said slide damper between said open and closed positions in event of failure of said power means and comprising a movable rack; b. means for mounting said reciprocating means on said ejector stack in substantially the same plane as said slide damper; c. a manually operable force multiplying device operatively connected to said reciprocating means for imparting movement thereto; and d. means for detachably connecting said reciprocating means to said slide damper, said detachable connecting means comprising a bail pin affixed to the end of said slide damper, and said rack being provided with a T-shaped slot for receiving said bail pin.
2. An auxiliary operator for manually moving a slide damper as claimed in claim 1, including a latch connected to said rack for locking said bail pin within said T-shaped slot.
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Cited By (4)

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Publication number Priority date Publication date Assignee Title
US4666403A (en) * 1986-08-06 1987-05-19 Morgan Construction Company Air preheating system for continuous fired furnace
US4925388A (en) * 1987-08-26 1990-05-15 Dainippon Screen Mfg. Co., Ltd. Apparatus for heat treating substrates capable of quick cooling
US6328561B1 (en) 1997-03-14 2001-12-11 Asm International N.V. Method for cooling a furnace, and furnace provided with a cooling device
US20110033711A1 (en) * 2007-12-14 2011-02-10 Denso Corporation Resin-metal bonded article and method for producing the same

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US4666403A (en) * 1986-08-06 1987-05-19 Morgan Construction Company Air preheating system for continuous fired furnace
US4925388A (en) * 1987-08-26 1990-05-15 Dainippon Screen Mfg. Co., Ltd. Apparatus for heat treating substrates capable of quick cooling
US6328561B1 (en) 1997-03-14 2001-12-11 Asm International N.V. Method for cooling a furnace, and furnace provided with a cooling device
US20110033711A1 (en) * 2007-12-14 2011-02-10 Denso Corporation Resin-metal bonded article and method for producing the same
US8394503B2 (en) * 2007-12-14 2013-03-12 Toadenka Corporation Resin-metal bonded article and method for producing the same

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