US2389038A - Method of bending plastic tubing - Google Patents

Method of bending plastic tubing Download PDF

Info

Publication number
US2389038A
US2389038A US591997A US59199745A US2389038A US 2389038 A US2389038 A US 2389038A US 591997 A US591997 A US 591997A US 59199745 A US59199745 A US 59199745A US 2389038 A US2389038 A US 2389038A
Authority
US
United States
Prior art keywords
tubing
sand
liquid
bending
interior
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US591997A
Inventor
German Milo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US591997A priority Critical patent/US2389038A/en
Application granted granted Critical
Publication of US2389038A publication Critical patent/US2389038A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/54—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles made of powdered or granular material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/023—Half-products, e.g. films, plates
    • B29B13/024—Hollow bodies, e.g. tubes or profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/08—Bending or folding of tubes or other profiled members
    • B29C53/083—Bending or folding of tubes or other profiled members bending longitudinally, i.e. modifying the curvature of the tube axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/66—Processes of reshaping and reforming
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4981—Utilizing transitory attached element or associated separate material

Definitions

  • the primary object of the invention is to avoid mutilation of the tubing and preserve its crosssectional contour irrespective of the number of bends or undulations that it may be subjected to during the bending operatio I
  • Another object is to preserve the final contour of the tubing after the bending operation has been effected.
  • this invention which embodies among its features introducing dehydrated finely divided material such as sand into the interior bore of a tube of plastic material which is subject to bending under the influence of heat.
  • Figure 1 is a view showing diagrammatically the same dehydrating and tube filling equipment employed in carrying out my invention.
  • Figure 2 shows one embodiment of the tube shaping cradle employed in connection with my invention.
  • Figure 3 is a fragmentary top plan view of Figure 2.
  • Figure 4 is a longitudinal sectional view through a tank containing heated liquid and showing my tube bending cradle supported therein with a piece of bent tubing in place.
  • Figure 5 is a fragmentary view partly in section of a piece of tubing showing the manner in which I plug the ends to preventthe escape of the sand from the interior thereof and the entrance of liquid thereinto, and
  • Figure 6 is a perspective view of a length of tubing bent in accordance with my invention.
  • FIG. 1 I have illustrated diagrammatically in Figure 1 a dehylow rotary cylinder ll mounted on rollers I! by means of which it is suspended for rotation about an inclined axis.
  • a hopper l3 Supported near the upper end of the cylinder l I is a hopper l3 carrying a spout 4 which discharges into the interior of the cylinder as shown.
  • a tuyere or burner I5 Supported immediately below the hopper l3 with its discharge end directed into the interior of the cylinder is a tuyere or burner I5 which is fed by a suitable fuel supply pipe l6 and is so positioned as to direct its flame into the interior of the cylinder ii in order to heat and dehydrate the material which is introduced thereinto from the hopper l3.
  • a hopper l6 Arranged adjacent the lower discharge end of the cylinder is a hopper l6 into which the buckets I! of a belt conveyor l8 dip in order to elevate the heated material from the hopper l6 and discharge it into thehopper ll of a cyclone designated generally l8.
  • the cyclone not only serves to agitate the finely divided dehydrated material but also is provided with a discharge hopper I9 carrying discharge spouts 20 beneath which the ends of the lengths of tubing to be bent are supported as illustrated.
  • sand be introduced into the hopper l3 and after being properly dehydrated in the dehydrator II it is conveyed on the conveyor l8 to the hopper i1 and discharged through the cyclone and hopper l9 and spout 20 into the length of tubing A which is to be bent. As shown one end of the tubing A is closed by a tightly fitting plug B so as to prevent the escape of the sand from the interior thereof and also prevent the entrance of moisture into the end of the tubing.
  • which comprises a pair of side bars 22 depending from which are legs 23 which serve to support at their lower ends a platform 24 which is bent into the shape that the tubing is to-take and in the present instance is shown as being substantially the arc of a circle.
  • the length of tubing A is somewhat greater than the chord between the points X, X of the are formed by the member 24 so that as the tubing sags to the desired contour it will be sustained or suspended until it has assumed the desired contour.
  • Extensions 25 are formed at opposite ends of the member 24 to accommodate the excess length of tubing as illustrated.
  • the tubing lengths are placed in the cradle II as illustrated in Figures 2 and 3 whereupon the cradle is lifted in its entirety and set into a liquid containing tank designated generally 28.
  • This tank is provided with a bottom wall 21 which conforms to the shape of the platform 24 of the cradle 2i and is likewise provided with extensions 28 to accommodate the members 25.
  • the liquid within the tank 28 is heated in any suitable manner, as for instance, by gas burners 28 served from a header 3! which, in turn, is supplied with gaseous fuel through a supply pipe 3
  • tubing lengths A are straight or substantially straight at the time that they are filled with the finely divided substance which has been dehydrated and heated in the equipment shown in Figure l and remain so until they are brought under. the influence of the heated liquid within the tank 26 at which time they slowly sag into the shape shown in Figure 4 or any other contour that may be imparted to the cradle bottom 24.
  • the liquid is kept heated by the burners 29 until the complete sagging has taken place after which the heat is turned off and the tank 24 and its contents allowed to cool to normal temperature.
  • the tubing is restored to its normal rigidity and after complete cooling it may be withdrawn from the liquid and the plugs B removed so that the sand or other material employed on the interior of the tubing may be completely dislodged therefrom. Due to the fact that the finely divided material has been dehydrated immediately before being introduced into the tubing and that the tubing is introduced into the tank while the sand is still hot, it is obvious that the heat of the sand contributes to the heat of the liquid in allowing the tubing to sag to proper shape. Also, due to the fact that the sand has been dehydrated and sealed within the tubing it is obvious that no steam or gases will be generated within the tubing which cause bulging or disruption of the tubing during the heating process.
  • any suitable liquid may be employed within the tank 26 which will meet the requirements for bending tubing made from plastic which can be shaped by thermal means and, therefore, I do not wish to be limited to the use of any specific types or kinds of heating liquids nor do I wish to be limited to the particular contours of tubing disclosed herein but I do wish to have my invention construed broad enough to include the method set forth in the appended claims.
  • the method of bending plastic tubing which comprises filling the bore of the tubing with a finely divided dehydrated substance of an inert character, plu ging the ends of the tubing to confine the finely divided substance and prevent the entrance of moisture into the interior of the tubing, suspending the tubing by opposite ends over a form conforming to the contour which is to be imparted to the tubing, introducing the tubing thus suspended into a bath of heated liquid, allowing the tubing to sag to conform to the shape of the form, cooling the tubing in the liquid, extracting the tubing from the liquid, removing the plugs from the ends of the tubing and discharging the finely divided substance from the interior of the tubing.
  • the herein described method of bending tubing which includes subjecting sand to a heating and dehydrating process, introducing the sand while in heated and dehydrated form into the interior of a length of tubing, plugging the ends of the tubing to prevent the escape of sand and the entrance of moisture, suspending the tubing above a matrix of the contour which the tubing is to finally assume, introducing the tubing and matrix into a liquid bath, heating the liquid constituting the bath, allowing the tubing to sag in the liquid to conform to the shape of the matrix, cooling the bath and tubing, withdrawing the tubing from the bath after it has cooled and becomes set, removing the plugs from the ends of the tubing and discharging the sand from the tubing.

Description

Nov. 13, 1945. M. GERMAN 2,389,038
METHOD OF BENDING PLASTIC TUBING Filed May 4, 1945 2 Sheets-Sheet 1 Inventor flzZo German,
Nov. 13, 1945.
M. GERMAN METHOD OF BENDING PLASTIC TUBING Filed May 4, 1945 2 Sheets-Sheet 2 I u uerllnr 22 b erman Patented Nov. 13, 1945 UNITED STATES PATENT OFFICE 2,389,038 METHOD OF BENDING PLASTIC TUBING Milo German, Cozad, Nebr. Application May 4, 1945, Serial No. 591,997 2 Claims.- (01. 18-56) drator designated generally Ill embodying a hol- This invention relates to bending plastic tubing and more particularly to the preservation oi the bore of the tubing while causing it to bend in desired configuration.
The primary object of the invention is to avoid mutilation of the tubing and preserve its crosssectional contour irrespective of the number of bends or undulations that it may be subjected to during the bending operatio I Another object is to preserve the final contour of the tubing after the bending operation has been effected.
The above and other objects may be attained by employing this invention which embodies among its features introducing dehydrated finely divided material such as sand into the interior bore of a tube of plastic material which is subject to bending under the influence of heat.
Other features embody the steps of heating the sand to dehydrate it and while in such heated condition introducing the sand into the bore of the tubing which is to be bent into the desired shape, plugging the ends of the tube length to prevent dislodgment of the sand therefrom and the entrance of moisture thereinto and subsequently depositing the tube in a tank containing heated liquid and allowing it to sag into proper shape under its own weight, allowing the liquid within the tank to assume normal temperature while the tube remains therein, withdrawing the tube from the liquid, removing the plugs from the ends of the bent tube and emptying the sand from the interior thereof.
In the drawings:
Figure 1 is a view showing diagrammatically the same dehydrating and tube filling equipment employed in carrying out my invention.
Figure 2 shows one embodiment of the tube shaping cradle employed in connection with my invention.
Figure 3 is a fragmentary top plan view of Figure 2.
Figure 4 is a longitudinal sectional view through a tank containing heated liquid and showing my tube bending cradle supported therein with a piece of bent tubing in place.
Figure 5 is a fragmentary view partly in section of a piece of tubing showing the manner in which I plug the ends to preventthe escape of the sand from the interior thereof and the entrance of liquid thereinto, and
Figure 6 is a perspective view of a length of tubing bent in accordance with my invention.
Referring to the drawings in detail, I have illustrated diagrammatically in Figure 1 a dehylow rotary cylinder ll mounted on rollers I! by means of which it is suspended for rotation about an inclined axis. Supported near the upper end of the cylinder l I is a hopper l3 carrying a spout 4 which discharges into the interior of the cylinder as shown. Supported immediately below the hopper l3 with its discharge end directed into the interior of the cylinder is a tuyere or burner I5 which is fed by a suitable fuel supply pipe l6 and is so positioned as to direct its flame into the interior of the cylinder ii in order to heat and dehydrate the material which is introduced thereinto from the hopper l3. Arranged adjacent the lower discharge end of the cylinder is a hopper l6 into which the buckets I! of a belt conveyor l8 dip in order to elevate the heated material from the hopper l6 and discharge it into thehopper ll of a cyclone designated generally l8. The cyclone not only serves to agitate the finely divided dehydrated material but also is provided with a discharge hopper I9 carrying discharge spouts 20 beneath which the ends of the lengths of tubing to be bent are supported as illustrated. While it is possible to use-other substances it is my preference that sand be introduced into the hopper l3 and after being properly dehydrated in the dehydrator II it is conveyed on the conveyor l8 to the hopper i1 and discharged through the cyclone and hopper l9 and spout 20 into the length of tubing A which is to be bent. As shown one end of the tubing A is closed by a tightly fitting plug B so as to prevent the escape of the sand from the interior thereof and also prevent the entrance of moisture into the end of the tubing.
Having thus prepared the tubing A it is placed in a cradle designated generally 2| which comprises a pair of side bars 22 depending from which are legs 23 which serve to support at their lower ends a platform 24 which is bent into the shape that the tubing is to-take and in the present instance is shown as being substantially the arc of a circle. As illustrated in Figure 2 the length of tubing A is somewhat greater than the chord between the points X, X of the are formed by the member 24 so that as the tubing sags to the desired contour it will be sustained or suspended until it has assumed the desired contour. Extensions 25 are formed at opposite ends of the member 24 to accommodate the excess length of tubing as illustrated.
Having filled the tubing with dehydrated finely divided material such as sand and plugged the ends with the plugs B the tubing lengths are placed in the cradle II as illustrated in Figures 2 and 3 whereupon the cradle is lifted in its entirety and set into a liquid containing tank designated generally 28. This tank is provided with a bottom wall 21 which conforms to the shape of the platform 24 of the cradle 2i and is likewise provided with extensions 28 to accommodate the members 25. The liquid within the tank 28 is heated in any suitable manner, as for instance, by gas burners 28 served from a header 3!! which, in turn, is supplied with gaseous fuel through a supply pipe 3|. Any other type of heating may be employed, however, which lends itself to the flexibility necessary for the process.
It is understood, of course, that the tubing lengths A are straight or substantially straight at the time that they are filled with the finely divided substance which has been dehydrated and heated in the equipment shown in Figure l and remain so until they are brought under. the influence of the heated liquid within the tank 26 at which time they slowly sag into the shape shown in Figure 4 or any other contour that may be imparted to the cradle bottom 24. The liquid is kept heated by the burners 29 until the complete sagging has taken place after which the heat is turned off and the tank 24 and its contents allowed to cool to normal temperature. During this cooling period the tubing is restored to its normal rigidity and after complete cooling it may be withdrawn from the liquid and the plugs B removed so that the sand or other material employed on the interior of the tubing may be completely dislodged therefrom. Due to the fact that the finely divided material has been dehydrated immediately before being introduced into the tubing and that the tubing is introduced into the tank while the sand is still hot, it is obvious that the heat of the sand contributes to the heat of the liquid in allowing the tubing to sag to proper shape. Also, due to the fact that the sand has been dehydrated and sealed within the tubing it is obvious that no steam or gases will be generated within the tubing which cause bulging or disruption of the tubing during the heating process.
It is obvious that any suitable liquid may be employed within the tank 26 which will meet the requirements for bending tubing made from plastic which can be shaped by thermal means and, therefore, I do not wish to be limited to the use of any specific types or kinds of heating liquids nor do I wish to be limited to the particular contours of tubing disclosed herein but I do wish to have my invention construed broad enough to include the method set forth in the appended claims.
What I claim is:
1. The method of bending plastic tubing which comprises filling the bore of the tubing with a finely divided dehydrated substance of an inert character, plu ging the ends of the tubing to confine the finely divided substance and prevent the entrance of moisture into the interior of the tubing, suspending the tubing by opposite ends over a form conforming to the contour which is to be imparted to the tubing, introducing the tubing thus suspended into a bath of heated liquid, allowing the tubing to sag to conform to the shape of the form, cooling the tubing in the liquid, extracting the tubing from the liquid, removing the plugs from the ends of the tubing and discharging the finely divided substance from the interior of the tubing.
2. The herein described method of bending tubing which includes subjecting sand to a heating and dehydrating process, introducing the sand while in heated and dehydrated form into the interior of a length of tubing, plugging the ends of the tubing to prevent the escape of sand and the entrance of moisture, suspending the tubing above a matrix of the contour which the tubing is to finally assume, introducing the tubing and matrix into a liquid bath, heating the liquid constituting the bath, allowing the tubing to sag in the liquid to conform to the shape of the matrix, cooling the bath and tubing, withdrawing the tubing from the bath after it has cooled and becomes set, removing the plugs from the ends of the tubing and discharging the sand from the tubing.
MILO GERMAN.
US591997A 1945-05-04 1945-05-04 Method of bending plastic tubing Expired - Lifetime US2389038A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US591997A US2389038A (en) 1945-05-04 1945-05-04 Method of bending plastic tubing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US591997A US2389038A (en) 1945-05-04 1945-05-04 Method of bending plastic tubing

Publications (1)

Publication Number Publication Date
US2389038A true US2389038A (en) 1945-11-13

Family

ID=24368837

Family Applications (1)

Application Number Title Priority Date Filing Date
US591997A Expired - Lifetime US2389038A (en) 1945-05-04 1945-05-04 Method of bending plastic tubing

Country Status (1)

Country Link
US (1) US2389038A (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2785406A (en) * 1956-01-30 1957-03-19 John T Riddell Inc Tubular face guard
US2909196A (en) * 1956-10-11 1959-10-20 Jr Robert F Jeffreys Flow restrictor
US2923066A (en) * 1957-07-17 1960-02-02 Jr John W Jones Variable drawing curve
US2938235A (en) * 1956-12-28 1960-05-31 Resistoflex Corp Method and apparatus for sintering polytetrafluoroethylene tubing
US2964796A (en) * 1955-12-15 1960-12-20 Resistoflex Corp Preformed flexible hose and method of making it
US3058874A (en) * 1962-10-16 hensler
US3207834A (en) * 1961-10-17 1965-09-21 Walterscheid Kg Jean Method of bending unfilled pipes and tubes
US3678146A (en) * 1967-11-29 1972-07-18 Emil Rottner Process for making pipe bends of thermoplastic material
US3919875A (en) * 1974-08-09 1975-11-18 Kralovopolska Strojirna Method of and apparatus for making high pressure tube bends, especially for the chemical industry
US3992505A (en) * 1975-08-18 1976-11-16 The Gates Rubber Company Method for producing curved elastomeric tubular articles
US4255378A (en) * 1977-10-13 1981-03-10 Miller Lee A Bending plastic pipe
US4273523A (en) * 1979-10-26 1981-06-16 Nipak, Inc. Sweep ell production apparatus
US4614626A (en) * 1984-04-27 1986-09-30 Frerking James R Method for fabricating a tennis racquet frame
US5907896A (en) * 1997-09-10 1999-06-01 Tseng; Shao-Chien Method for bending forging artistic metallic pipes
EP0950487A1 (en) * 1998-03-12 1999-10-20 Paul Troester Maschinenfabrik Apparatus for heat treating elastomeric articles
US20150226359A1 (en) * 2013-06-20 2015-08-13 The Boeing Company Methods of manufacturing a fluid distribution system assembly
US9310023B2 (en) 2013-06-20 2016-04-12 The Boeing Company Methods and systems for distributing inert gas in an aircraft

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3058874A (en) * 1962-10-16 hensler
US2964796A (en) * 1955-12-15 1960-12-20 Resistoflex Corp Preformed flexible hose and method of making it
US2785406A (en) * 1956-01-30 1957-03-19 John T Riddell Inc Tubular face guard
US2909196A (en) * 1956-10-11 1959-10-20 Jr Robert F Jeffreys Flow restrictor
US2938235A (en) * 1956-12-28 1960-05-31 Resistoflex Corp Method and apparatus for sintering polytetrafluoroethylene tubing
US2923066A (en) * 1957-07-17 1960-02-02 Jr John W Jones Variable drawing curve
US3207834A (en) * 1961-10-17 1965-09-21 Walterscheid Kg Jean Method of bending unfilled pipes and tubes
US3678146A (en) * 1967-11-29 1972-07-18 Emil Rottner Process for making pipe bends of thermoplastic material
US3919875A (en) * 1974-08-09 1975-11-18 Kralovopolska Strojirna Method of and apparatus for making high pressure tube bends, especially for the chemical industry
US3992505A (en) * 1975-08-18 1976-11-16 The Gates Rubber Company Method for producing curved elastomeric tubular articles
US4255378A (en) * 1977-10-13 1981-03-10 Miller Lee A Bending plastic pipe
US4273523A (en) * 1979-10-26 1981-06-16 Nipak, Inc. Sweep ell production apparatus
US4614626A (en) * 1984-04-27 1986-09-30 Frerking James R Method for fabricating a tennis racquet frame
US5907896A (en) * 1997-09-10 1999-06-01 Tseng; Shao-Chien Method for bending forging artistic metallic pipes
EP0950487A1 (en) * 1998-03-12 1999-10-20 Paul Troester Maschinenfabrik Apparatus for heat treating elastomeric articles
US20150226359A1 (en) * 2013-06-20 2015-08-13 The Boeing Company Methods of manufacturing a fluid distribution system assembly
US9310023B2 (en) 2013-06-20 2016-04-12 The Boeing Company Methods and systems for distributing inert gas in an aircraft

Similar Documents

Publication Publication Date Title
US2389038A (en) Method of bending plastic tubing
NO122764B (en)
CN207487327U (en) A kind of dried orange peel dryer
US2465953A (en) Melting apparatus for bituminous materials
US4734165A (en) Method for the production of coke
US3637365A (en) Preheating glass batch material by melting the batch core area
CN208530972U (en) A kind of thermal-shrinkage furnace that can be improved set mark film and shrink efficiency
EP0019389A1 (en) Vertical pyrolysing furnace, more particularly for tyre pieces
US2290742A (en) Removable tank heater
US3059281A (en) Method of making a reinforced article having an internal integral configuration
US7828004B2 (en) Method and device for storing chemical products in a container
US2494501A (en) Submerged resistor induction furnace
US1873535A (en) Method of heating molds for molding thermo-plastic materials
US2563843A (en) Processing of cast elongated articles
US2784243A (en) Heat treating furnace
US1054041A (en) Method of treating brick.
US1933529A (en) Method of surface treating glassware
US1097576A (en) Method and apparatus for baking.
US1498519A (en) Poration
US2853735A (en) Method and apparatus for molding cork products
CN212109423U (en) Novel tunnel oven tail bottle evacuation balancing weight mechanism
US1787197A (en) Rotary drier
CN208086455U (en) A kind of temperature-controllable wax liquor storing apparatus
CN210374504U (en) Brake block mould heating device
CN203632046U (en) A baking box used for components inside a power supply cabinet