US2189983A - Chain conveyer for heat-treating furnaces - Google Patents

Chain conveyer for heat-treating furnaces Download PDF

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Publication number
US2189983A
US2189983A US168906A US16890637A US2189983A US 2189983 A US2189983 A US 2189983A US 168906 A US168906 A US 168906A US 16890637 A US16890637 A US 16890637A US 2189983 A US2189983 A US 2189983A
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United States
Prior art keywords
furnace
chain
heat
members
trays
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Expired - Lifetime
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US168906A
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English (en)
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Henry H Harris
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Individual
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Individual
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Priority to US168906A priority Critical patent/US2189983A/en
Priority to FR844745D priority patent/FR844745A/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/243—Endless-strand conveyor

Definitions

  • My invention relates generally to heat treat- ,ing furnaces, and specifically to the provision of an apparatus for conveying articles to be heat treated through such furnaces.
  • articles to be heat treated are travelled through furnaces either, if of sufiiciently large size, by being placed directly on skid rails or tracks or roller rails and being pushed through the furnace, or else, in those instances where the articles are of rather small size and are loaded onto supports, or trays as they are commonly called, and pushed through the furnace in tandem either on skid rails or tracks or roller rails.
  • Myinvention although applicable for use with larger articles, will be described with relation to its use with trays of the hinged type such as described and claimed in my Patent No.
  • the main object of my invention is the provision of a method and apparatus for moving work supports such as trays or the like through furnaces quickly and economically.
  • my invention consists in utilizing a pair of endless, continuous drag conveyer chains mounted for travel within the furnace and along the longitudinal walls thereof, and providing these endless, continuous chains with means to drag along therewith trays 'on which are disposed articles to be heat trea
  • a pair of endless, continuous drag conveyer chains mounted for travel within the furnace and along the longitudinal walls thereof, and providing these endless, continuous chains with means to drag along therewith trays 'on which are disposed articles to be heat trea
  • Figure 1 is a side eievational view, partly in section, of one form of chain constructed according to and embodying my invention
  • Fig. 2 is a bottom plan view, also partly in section, of the chain illustrated in Fig. 1, along the broken line 2-2 of Fig. 1;
  • Fig. 3 is a section on the line 3-3 of Fig. 1;
  • Fig. 4 is a section on the line 4-4 of Fig. 1;
  • Fig. 5 is an exploded view of the component parts of the form of chain illustrated in Figs. 1 to 4;
  • Fig. 6 is a crosssectional view through a conventional form of heat treating furnace with one form ofmy invention applied thereto;
  • Fig. 7 is a longitudinal sectional view through the furnace shown in Fig. 6, illustrating one form of the endless, continuous chain drive connection in elevation;
  • Fig. .8 is a plan view of a sprocket wheel showing a portion of the chain passing thereover;
  • Fig. 9 is a View similar to Fig. 2 of a modified form of chain constructed according to and embodying my invention.
  • Fig. 10 is a section on the line Ill-It of Fig. 9;
  • Fig. ll is a view similar to Fig. 1 illustrating the form of chain shown in Fig. 9 in operation;
  • Fig. 12 is a view generally similar to Fig. 7', but illustrating in elevation a modification of my invention in which the endless, continuous chain drive of my invention is wholly contained within the furnace.
  • reference numeral l0 indicates one form of chain constructed according to and embodying my invention, which is formed ofa plurality of what I prefer to designate as I-mernbers it, connected and pivotally secured together by a plurality of what I prefer to designate as O-members it.
  • Each I-member l2 comprises a one-piece metal casting of heat and corrosion resisting alloy, preferably of nickel, chromium and iron.
  • Each member I! is provided with a straight body portion l6 and a pair of cross heads l8, l8 at the opposite ends thereof and at right angles thereto, so that member l2 as a unit generally resembles a capital letter I.
  • Cross-heads l8, l8 are circular in cross-section and of substantially uniform thickness, and body portion I6 is preferably of like formation.
  • I-members I! are pivotally secured together, as shown, by O-membersll, each of which comprises a pair of opposed elliptical rings 20, 20, having generally the form of a capital letter 0. These rings 20, 20 are also adjustment, at least one pair of O-members or thereof projecting inwardly from each side as indicated in Fig. 5, and welding together the meeting ends of extensions 22, 22, as indicated.
  • rings 20 are formed sufficiently wide and long enough to receive cross-heads I8, I8 loosely therewithin and to enable the I-members I2 to swing and pivot freely with respect to one another. This free pivoting movement is essential for proper operation of the chain as a whole, and while limited on one side because of the welded connection '23 between extensions 22,- 22, the pivotal movement between I-members I2 on the other side is practically unlimited.
  • reference numeral 30 indicates one form of furnace wherein comprises floor 32', side swalls 34, 34, front and back walls 36 and 38, having openings through which the chain-is passed, and roof 40.
  • Chain I0 is carried by a number of sprocket wheels, disposed about driving wheel 42 and driven wheel 44.
  • both the idler wheels-and the take-up wheel may be dispensed with if desired by providing compensating adiust-' ments between the drive wheel and the driven wheel, and in such case the return may be outside, instead of inside the furnace as shown.
  • all'of these wheels are disposed outside of furnace 30, with chain I0 passing within the furnace confines during both travel and return.
  • the sprocket wheels may be disposed within the furnace also.
  • Drive sprocket wheel 42, driven wheel 44, takeup wheel 50, and, idler wheels 46 and 40 are all generally similar in construction, if not in size, having laterally spaced sprocket teeth 5
  • A. plurality of lugs or dogs are provided on chain I0, spaced apart; 'at predetermined distances, to engage trays to be travelled through the furnace and move same along through the Rings 20, 20 are duplicates of each other, though turned into reverse positions in the asiron,
  • I provide a pair of H-beams 62, 62 disposed on furnace floor 32, extending longitudinally of the furnace and along the side walls thereof.
  • chain I0 passes through and along the upper channel 84 of beam 82, the side walls I50, 66 of which are short enough to permit lugs or dogs 60 to project upwardly therebeyond and engage the sides or ends of trays, as 68, to move same along therewith through the furnace.
  • tray 68 is de-' posited on a take-off platform (not shown) and chain I0 passed over driven wheel 44.
  • Lugs 80 are still directed outwardly, but when passing over idler rollers 46, 48 the lugs are directed inwardly and provision is made, in the form of a deep peripheral channel I0 within wheels 48 and 48, to receive lugs 60.
  • chain I0 passes through furnace 30 in a reverse direction, within lower channel I2 of beam 62, and a slotted split rail 14 is provided to rest on furnace floor 32 and support the returning chain I0, its slot I5 receiving the-lugs or dogs 60.
  • the H-beams 62 serve as tracks for the tray 68, said tray 88 being supported near its outer edges on the top of beam walls 66, 66.
  • a roller rail .16 may be centrally disposed within the furnace'between the side rails or beams 62 extending ldngitudinally thereof, to make a rolling contact with the underside of tray 68 at the middle thereof to facilitate movement of the tray through the furnace, and the tray may be hinged,
  • Figs. 9 to 11, 1 have illustrated a modified form of chain 80.
  • chain 80 also made up of one-piece metal castings of heat and corrosion re--v sisting alloy, preferably of nickel, chromium and I-members 82 are generally similar to 1- members I2, and are provided with cross-heads 83 similar tocross-heads I8 but instead of being connected by connectors made up of a pair of identical, but oppositely disposed 'O-members, as 20, members 82. are connected by caps 84 and 88, both of which have elliptical recesses therewithin to receive the ends of a pair of adjacent crossheads 83, 83.
  • Caps 84 are flattened on top, but caps 88 are rounded on their undersides. In this modification, caps 84 and 88 are similarly provided with extensions 88, which are welded together as at 89 to complete the link unit. Also, lugs or dogs 80 are provided on chain 80, similarly welded over extensions 88 and projecting outwardly therefrom.
  • chain I0 is travelled through the furnace and over sprocket wheels in a vertical plane.
  • chain 80 I am enabled to travel the chain through the furnace in a horizontalplane. In instances where it is either impossible or impractical to use space underneath the furnace floor level,,this horizontal travel may be necessary.
  • chain 80 is shown travelling through a furnace with the rounded undersides of caps 86 sliding along on tracks or guideways 82 formed on the side walls of the furnace, with dogs 90 extending outwardly a distance sufilcient to engage and move along therewith the trays 94 resting on suitable supports such as skid rails 86.
  • the rounded cap 86 supports the chain and reduces the friction on the chain supporting track 92.
  • each link (I-o member) comprising but two parts when completed.
  • the elliptical ring or cap construction provides "a large bearing surface upon the twin-toothed sprockets, and the relative pivotal' obtained.
  • the turning eflect so produced within each O-member orpivoting member, as when the chain passes around a sprocket wheel, is divided up so that it takes place partly between the forward cross-heads and the O-member, and partly between the rear cross bar and the same O-memher or ring.
  • the radius of turning can be greatly decreased, and the entire arrangement of chain and sprocket wheels made much more compact than wouldotherwise be possible.
  • '1 provide a pair of H-beams 63, disposed on furnace floor 32, extending longitudinally of the furnace 30 and along the side walls thereof, similarly to beams 62 in Figs; 6 and 7.
  • chain l passes around wheel 42 and through the furnace in one direction along the upper trackway 65, around wheel 44.
  • H-beam 83 The side walls of H-beam 83 are widened, as at 69, to. provide journals for the drive and driven sprocket wheels 42, '44, in close proximity to the trackways, and the lower track-.- way 61 is provided with an inclined apron II, upon which chain l0 rides upon entering and leaving the lower trackway.- Such arrangement makes it possible to keep the entire chain drive connection within' the furnace.
  • the source of power to actuate the shafts on which the sprockets are mounted may, if desired, come fromoutside the furnace. and the chain it may be kept under tension by a take-up arrangement of sprocket wheels 42, 44 (not shown).
  • a tray and means to convey same through a heat treating furnace which conveying means comprise a pair of aligned and I spaced apart trackway members disposed on opposite sides of and extending the length of the furnace, a central supportingmember also within the furnace and extending the length thereof substantially midway between the trackways, the tray comprising a plurality of sections hinged together each of which sections is supported by 85 one trackway and the central support, and movable means associated with the trackways for engaging the tray and moving same through th furnace.
  • a tray and means .to convey same through a heat treating furnace, which conveying means comprise'a pair of aligned and spaced apart trackway members disposed on opposite sides of and extending the length of the furnace, a supporting member also within the .furnace and extending the length thereof substantially midway-between the trackway-s, the

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
US168906A 1937-10-14 1937-10-14 Chain conveyer for heat-treating furnaces Expired - Lifetime US2189983A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US168906A US2189983A (en) 1937-10-14 1937-10-14 Chain conveyer for heat-treating furnaces
FR844745D FR844745A (fr) 1937-10-14 1938-10-14 Transporteur à chaîne pour fours de traitement thermique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US168906A US2189983A (en) 1937-10-14 1937-10-14 Chain conveyer for heat-treating furnaces

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US2189983A true US2189983A (en) 1940-02-13

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FR (1) FR844745A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2482364A (en) * 1941-10-22 1949-09-20 Bell Telephone Labor Inc Device for heat-treating magnetic materials
US2891659A (en) * 1957-05-23 1959-06-23 Hayes Inc C I Conveyor system and retractable latch therefor
US2980411A (en) * 1958-09-25 1961-04-18 Selas Corp Of America Strip threading device
US4417722A (en) * 1980-12-23 1983-11-29 Japan Oxygen Co., Ltd. Vacuum furnace for heat treatment
US6082442A (en) * 1997-05-21 2000-07-04 Babock Kraftwerkstechnik Gmbh Apparatus for removal and cooling of ash from the bed of a fluidized bed furnace

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1014817B (de) * 1952-10-30 1957-08-29 Licentia Gmbh Durchlauf-Emaillierofen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2482364A (en) * 1941-10-22 1949-09-20 Bell Telephone Labor Inc Device for heat-treating magnetic materials
US2891659A (en) * 1957-05-23 1959-06-23 Hayes Inc C I Conveyor system and retractable latch therefor
US2980411A (en) * 1958-09-25 1961-04-18 Selas Corp Of America Strip threading device
US4417722A (en) * 1980-12-23 1983-11-29 Japan Oxygen Co., Ltd. Vacuum furnace for heat treatment
US6082442A (en) * 1997-05-21 2000-07-04 Babock Kraftwerkstechnik Gmbh Apparatus for removal and cooling of ash from the bed of a fluidized bed furnace

Also Published As

Publication number Publication date
FR844745A (fr) 1939-07-31

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