CA2042335A1 - Welding device for thermoplastics - Google Patents
Welding device for thermoplasticsInfo
- Publication number
- CA2042335A1 CA2042335A1 CA002042335A CA2042335A CA2042335A1 CA 2042335 A1 CA2042335 A1 CA 2042335A1 CA 002042335 A CA002042335 A CA 002042335A CA 2042335 A CA2042335 A CA 2042335A CA 2042335 A1 CA2042335 A1 CA 2042335A1
- Authority
- CA
- Canada
- Prior art keywords
- plastic
- rod
- chamber
- welder
- issuing
- 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.)
- Abandoned
Links
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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
- B29C65/12—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined and welding bar
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/84—Specific machine types or machines suitable for specific applications
- B29C66/861—Hand-held tools
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Applicant: J. Pierre Pottier For: Welding Device for Thermoplastics ABSTRACT OF DISCLOSURE
A welding device for thermoplastics includes a chamber for receiving a plastic welding rod at its inlet and issuing molten plastic at its outlet; means for heating the rod in the chamber to the melting point; and means for feeding the plastic rod into the chamber to drive out melted plastic rod and replace it with more rod to be melted.
A welding device for thermoplastics includes a chamber for receiving a plastic welding rod at its inlet and issuing molten plastic at its outlet; means for heating the rod in the chamber to the melting point; and means for feeding the plastic rod into the chamber to drive out melted plastic rod and replace it with more rod to be melted.
Description
Applicant: J. Pierre Pottier For: Welding Device for Thermoplastics FIELD OF INVENTION
This invention relates to a welding device for thermoplastics, and more particularly to such a welding device which extrudes the molten plastic without conventional extruder mechanisms by melting the forward end of a welding rod and using the unmelted following portion of the rod to push out the melted portion.
BACKGROUND OF INVENTION
Conventional thermoplastic welding torches heat the weld surface and the underside of the welding rod as it is fed onto the weld surface. The melted side of the rod adheres to the heated weld surface and becomes anchored so that as the welding torch is moved along the weld surface more rod is drawn to ma~e a continuous bead. This approach does not heat the rod thoroughly and so cold joints can occur. In addition, if the weld requires a bead greater than afforded by the rod, a number of passes must be made so that a number of rods are laid down to create a sufficiently large bead to fill the weld.
Extrusion welders do not use heated rods at the weld.
Rather, pellets, rods or any other form of plastic is heated and then extruded using a heavy duty motor and stainless steel or chromium plated drive screw to pressurize and extrude the molten plastic. These devices, although portable, are e~tremely heavy due to the powerful screw drive motor LA~-lOlJ 3 jsi 2~4233~
required and create a great strain on the operator due to the weight and the strong torquing forces generated which constantly twist the device in the hands of the operator and increase his fatigue. Generally, frequent rest stops are needed so that the extruder is used only a few minutes at a time. These devices are also large and hard to maneuver in tight places such as inside and outside corner joints to be welded. Typically two nozzles are used, one to provide hot air to preheat the surface to be welded and one to deliver the extruded plastic.
SUMMARY OF INVENTION
It is therefore an object of this invention to provide an improved portable welding device for thermoplastics.
It is a further object of this invention to provide such a welding device which is lighter in weight, simpler and less expensive.
It is a further object of this invention to provide such a welding device which is more maneuverable, requires less power and is less fatiguing to the operator.
It is a further object of this invention to provide such a welding device which produces an extrusion-like weld without the extruder bulk, weight, expense and complexity.
The invention results from the realization that a truly effective welder for thermoplastic material can be made by melting a continuously fed rod to create the welding bead material and using the incoming unmelted portion of the rod to push out the melted portion of the rod, and the further L~ lOlJ 4 ~42~3~
realization that the same heated gas used to preheat the weld surface can be used to melt the rod.
This invention features a welding device for thermoplastics including a chamber for receiving a plastic welding rod at its inlet and issuing molten plastic at its outlet. There are means for heating the rod in the chamber to the melting point and means for feeding the plastic rod into the chamber to drive out melted plastic rod and replace it with more rod to be melted.
In a preferred embodiment there are means for preheating the surface to be welded. The chamber outlet may include a foot with a first hole in it for issuing the molten plastic.
The foot may include a shoe with an aperture aligned with the hole for issuing the molten plastic. The shoe may be formed of a self-lubricating material such as polytetrafluorethylene.
The chamber closely, slidingly receives the rod and the means for heating ~ay include a heat exchanger surface on the outside of the chamber. The means for heating further includes a heating element which may be mounted directly on the chamber or may be remote from the chamber and used in conjunction with a source of a nonflammable gas, e.g. air or inert gases, for moving the gas over the heating element and then over the heat exchanger at the chamber. The means for preheating a surface to be welded may include a port proximate the outlet for issuing the heated gas which is received after it has contacted the heat exchanger on the chamber. There is a housing surrounding the chamber and the LAR-lOlJ 5 ~Si 2~L233~
heat exchanger surface includes at least one channel extending between the housing and the chamber. The gas used to transfer the heat may be air and the welding rod may be solid or hollow.
DISCLOSURE OF PREFERRED EMBODIMENT
Other objects, features and advantages will occur to those skilled in the art from the following description of a preferred embodiment and the accompanying drawings, in which:
Fig. 1 is a cross-sectional view of a welding device for thermoplastics welder according to this invention; and Fig. 2 is an enlarged detail view of the welding rod drive mechanism of Fig. 1.
This invention may be accomplished with a welding device for thermoplastics having a chamber for receiving a 3/16-inch plastic welding rod made of such material as polyethylene, polypropylene, hybrid polyolefins, or Kynar as well as most other thermoplastics. The rod is received at the inlet end of the chamber and after heating within the chamber is issued as molten plastic at the outlet of the chamber. The chamber may be heated directly by an electrical element or similar device or may be heated indirectly, for example by passing over it heated gas (air or inert gas). The rod is fed into the chamber to drive out melted plastic rod, and replace it with more rod to be melted, by a drive wheel driven at low speed, e.g. 6 RPM, by a motor such as a Hurst Mfg.
~T 2602-013. The heater may be a 1000 watt cartridge heater LAR-lOlJ 6 jsi ~233~
through whlch air or inert gas (nitrogen) at approximately 3 psi is driven at the rate of about 2 cubic feet per minute.
A preheater is used to warm the surface to be welded. The preheater may be pressurized air driven through the heater and first used to heat the chamber to melt the welding rod.
The chamber outlet may include a foot with a hole in it for issuing the molten plastic that creates the welding bead.
The foot may include a shoe having an aperture that is aligned with the hole for issuing the molten plastic. The shoe may be fitted with a sole made of a self-lubricat~ing material such as Teflon, or a polytetrafluorethylene composition. The sole comes in several configurations. Thc chamber, which may be a steel tube, closely, slidingly receives the rod. The chamber may have a heat exchanger on its outside surface for transferring the heat from the heated moving air to the chamber to melt the welding rod. That same air may be expressed through a port proximate the chamber outlet to preheat the surface to be welded.
The heat exchanger on the chamber may include a single channel or a number of channels through which the heated air flows. The heat exchanger may include a helical channel or a helical channel plus an annular channel, or it may include vertical, inclined or various other arrangements of channels or fins just so long as there is enough time for an amount of heat sufficient to melt the welding rod to be transferred from the heated air to the chamber.
LAR-lOlJ 7 ~ s i ~4233~
There is shown in Fig. 1 a welding device for thermoplastics according to this invention including a hollow stainless steel tubing 12 which holds an interchangeable electrical heating element or cartridge 14 that engages with electrical socket 16 in handle 18. Typically 110/120 volt 60 cycle or 220-240 volt 50 cycles power is fed on cable 20 through a non-corrosive vinyl hose 22, through the hollow area 24 of handle 18, through the heating element 14, and thence through housing 12 to heat exchanger 26 mounted on chamber 28. Pressurized air or nitrogen is delivered through hose 22. Air heated by heating element 14 transfers heat through heat exchanger 26 to chamber 28 containing welding rod 30, which is solid up to approximately point 32 ~n~
melted beyond that. Heat exchanger 26 has a generally tapered or conical shape and contains a helical channel 34 through it as well as an annular channel 36 of decreasing radius between it and the wall of housing 12. Heat exchanger 26 need not be tapered and need not provide annular chamber 36: it may be expanded to closely contact the walls of housing 12 so that a single helical channel is provided.
Alternatively, heat exchanger 26 can be formed wit;n one or more vertical or inclined channels.
After the air passes through heat exchanger 26 to melt the rod in chamber 28, that heated air passes out of preheat port 40 in foot 42. Foot 42 may include a stainless steel shoe holder 44 and a Teflon shoe 46. Preheat port 40 is formed by an aperture 48 in shoe 46 which mates with hole 50 LAR-lOlJ 8 ~51 2~5 in shoe holder 44. The outlet end 52 of chamber 28 passes through shoe holder 44 and shoe ~6 to provide the molten plastic in a bead right at the joint to be welded. The molten plastic 54 below point 32 is forced out of chamber 28 by means of rod 30 , which is solid above point 31, and which is driven by drive mechanism 60. Mechanism 60 sits atop support plate 62 mounted by collar 64 on housing 12 at one end and at the other end is mounted by standoff 66 which rises from the curved elbow area of housing 12 and supports a second, forward handle 68. This handle is adjustable for right or left-handed use.
Drive mechanism 60 include!a drive wheel 70 mounted on shaft 72 driven by 110/120 volt low-speed electric motor 74.
Shaft 72 is supported in bearing block 76. The drive mechanism also includes a spring loaded idler wheel 78, Fig.
2, which may have a shallow groove for aligning rod 30 and providing a pinching action against which the friction surface 80 of drive wheel 70 can act. Motor 74 is driven slowly at approximately 6 RPM to feed rod 30 downwardly through chamber 28 at a rate that permits the rod to be melted in the lower portion of chamber 28 and pushed out by the constantly delivered unmelted portion of rod 30 being driven down by drive wheel 70. Motor 74 is interconnected by leads 86 to electrical terminals 88 energized from cable 20 to drive motor 74 and electric heating element 14.
LAR-lOlJ 9 jsi - 2~4233~
Although specific features of the invention are shown in some drawings and not others, this is for convenience only as each feature may be combined with any or all of the other features in accordance with the invention.
Other embodiments will occur to those skilled in the art and are within the following claims:
What is claimed is:
L~R-lOlJ 10 jsi
This invention relates to a welding device for thermoplastics, and more particularly to such a welding device which extrudes the molten plastic without conventional extruder mechanisms by melting the forward end of a welding rod and using the unmelted following portion of the rod to push out the melted portion.
BACKGROUND OF INVENTION
Conventional thermoplastic welding torches heat the weld surface and the underside of the welding rod as it is fed onto the weld surface. The melted side of the rod adheres to the heated weld surface and becomes anchored so that as the welding torch is moved along the weld surface more rod is drawn to ma~e a continuous bead. This approach does not heat the rod thoroughly and so cold joints can occur. In addition, if the weld requires a bead greater than afforded by the rod, a number of passes must be made so that a number of rods are laid down to create a sufficiently large bead to fill the weld.
Extrusion welders do not use heated rods at the weld.
Rather, pellets, rods or any other form of plastic is heated and then extruded using a heavy duty motor and stainless steel or chromium plated drive screw to pressurize and extrude the molten plastic. These devices, although portable, are e~tremely heavy due to the powerful screw drive motor LA~-lOlJ 3 jsi 2~4233~
required and create a great strain on the operator due to the weight and the strong torquing forces generated which constantly twist the device in the hands of the operator and increase his fatigue. Generally, frequent rest stops are needed so that the extruder is used only a few minutes at a time. These devices are also large and hard to maneuver in tight places such as inside and outside corner joints to be welded. Typically two nozzles are used, one to provide hot air to preheat the surface to be welded and one to deliver the extruded plastic.
SUMMARY OF INVENTION
It is therefore an object of this invention to provide an improved portable welding device for thermoplastics.
It is a further object of this invention to provide such a welding device which is lighter in weight, simpler and less expensive.
It is a further object of this invention to provide such a welding device which is more maneuverable, requires less power and is less fatiguing to the operator.
It is a further object of this invention to provide such a welding device which produces an extrusion-like weld without the extruder bulk, weight, expense and complexity.
The invention results from the realization that a truly effective welder for thermoplastic material can be made by melting a continuously fed rod to create the welding bead material and using the incoming unmelted portion of the rod to push out the melted portion of the rod, and the further L~ lOlJ 4 ~42~3~
realization that the same heated gas used to preheat the weld surface can be used to melt the rod.
This invention features a welding device for thermoplastics including a chamber for receiving a plastic welding rod at its inlet and issuing molten plastic at its outlet. There are means for heating the rod in the chamber to the melting point and means for feeding the plastic rod into the chamber to drive out melted plastic rod and replace it with more rod to be melted.
In a preferred embodiment there are means for preheating the surface to be welded. The chamber outlet may include a foot with a first hole in it for issuing the molten plastic.
The foot may include a shoe with an aperture aligned with the hole for issuing the molten plastic. The shoe may be formed of a self-lubricating material such as polytetrafluorethylene.
The chamber closely, slidingly receives the rod and the means for heating ~ay include a heat exchanger surface on the outside of the chamber. The means for heating further includes a heating element which may be mounted directly on the chamber or may be remote from the chamber and used in conjunction with a source of a nonflammable gas, e.g. air or inert gases, for moving the gas over the heating element and then over the heat exchanger at the chamber. The means for preheating a surface to be welded may include a port proximate the outlet for issuing the heated gas which is received after it has contacted the heat exchanger on the chamber. There is a housing surrounding the chamber and the LAR-lOlJ 5 ~Si 2~L233~
heat exchanger surface includes at least one channel extending between the housing and the chamber. The gas used to transfer the heat may be air and the welding rod may be solid or hollow.
DISCLOSURE OF PREFERRED EMBODIMENT
Other objects, features and advantages will occur to those skilled in the art from the following description of a preferred embodiment and the accompanying drawings, in which:
Fig. 1 is a cross-sectional view of a welding device for thermoplastics welder according to this invention; and Fig. 2 is an enlarged detail view of the welding rod drive mechanism of Fig. 1.
This invention may be accomplished with a welding device for thermoplastics having a chamber for receiving a 3/16-inch plastic welding rod made of such material as polyethylene, polypropylene, hybrid polyolefins, or Kynar as well as most other thermoplastics. The rod is received at the inlet end of the chamber and after heating within the chamber is issued as molten plastic at the outlet of the chamber. The chamber may be heated directly by an electrical element or similar device or may be heated indirectly, for example by passing over it heated gas (air or inert gas). The rod is fed into the chamber to drive out melted plastic rod, and replace it with more rod to be melted, by a drive wheel driven at low speed, e.g. 6 RPM, by a motor such as a Hurst Mfg.
~T 2602-013. The heater may be a 1000 watt cartridge heater LAR-lOlJ 6 jsi ~233~
through whlch air or inert gas (nitrogen) at approximately 3 psi is driven at the rate of about 2 cubic feet per minute.
A preheater is used to warm the surface to be welded. The preheater may be pressurized air driven through the heater and first used to heat the chamber to melt the welding rod.
The chamber outlet may include a foot with a hole in it for issuing the molten plastic that creates the welding bead.
The foot may include a shoe having an aperture that is aligned with the hole for issuing the molten plastic. The shoe may be fitted with a sole made of a self-lubricat~ing material such as Teflon, or a polytetrafluorethylene composition. The sole comes in several configurations. Thc chamber, which may be a steel tube, closely, slidingly receives the rod. The chamber may have a heat exchanger on its outside surface for transferring the heat from the heated moving air to the chamber to melt the welding rod. That same air may be expressed through a port proximate the chamber outlet to preheat the surface to be welded.
The heat exchanger on the chamber may include a single channel or a number of channels through which the heated air flows. The heat exchanger may include a helical channel or a helical channel plus an annular channel, or it may include vertical, inclined or various other arrangements of channels or fins just so long as there is enough time for an amount of heat sufficient to melt the welding rod to be transferred from the heated air to the chamber.
LAR-lOlJ 7 ~ s i ~4233~
There is shown in Fig. 1 a welding device for thermoplastics according to this invention including a hollow stainless steel tubing 12 which holds an interchangeable electrical heating element or cartridge 14 that engages with electrical socket 16 in handle 18. Typically 110/120 volt 60 cycle or 220-240 volt 50 cycles power is fed on cable 20 through a non-corrosive vinyl hose 22, through the hollow area 24 of handle 18, through the heating element 14, and thence through housing 12 to heat exchanger 26 mounted on chamber 28. Pressurized air or nitrogen is delivered through hose 22. Air heated by heating element 14 transfers heat through heat exchanger 26 to chamber 28 containing welding rod 30, which is solid up to approximately point 32 ~n~
melted beyond that. Heat exchanger 26 has a generally tapered or conical shape and contains a helical channel 34 through it as well as an annular channel 36 of decreasing radius between it and the wall of housing 12. Heat exchanger 26 need not be tapered and need not provide annular chamber 36: it may be expanded to closely contact the walls of housing 12 so that a single helical channel is provided.
Alternatively, heat exchanger 26 can be formed wit;n one or more vertical or inclined channels.
After the air passes through heat exchanger 26 to melt the rod in chamber 28, that heated air passes out of preheat port 40 in foot 42. Foot 42 may include a stainless steel shoe holder 44 and a Teflon shoe 46. Preheat port 40 is formed by an aperture 48 in shoe 46 which mates with hole 50 LAR-lOlJ 8 ~51 2~5 in shoe holder 44. The outlet end 52 of chamber 28 passes through shoe holder 44 and shoe ~6 to provide the molten plastic in a bead right at the joint to be welded. The molten plastic 54 below point 32 is forced out of chamber 28 by means of rod 30 , which is solid above point 31, and which is driven by drive mechanism 60. Mechanism 60 sits atop support plate 62 mounted by collar 64 on housing 12 at one end and at the other end is mounted by standoff 66 which rises from the curved elbow area of housing 12 and supports a second, forward handle 68. This handle is adjustable for right or left-handed use.
Drive mechanism 60 include!a drive wheel 70 mounted on shaft 72 driven by 110/120 volt low-speed electric motor 74.
Shaft 72 is supported in bearing block 76. The drive mechanism also includes a spring loaded idler wheel 78, Fig.
2, which may have a shallow groove for aligning rod 30 and providing a pinching action against which the friction surface 80 of drive wheel 70 can act. Motor 74 is driven slowly at approximately 6 RPM to feed rod 30 downwardly through chamber 28 at a rate that permits the rod to be melted in the lower portion of chamber 28 and pushed out by the constantly delivered unmelted portion of rod 30 being driven down by drive wheel 70. Motor 74 is interconnected by leads 86 to electrical terminals 88 energized from cable 20 to drive motor 74 and electric heating element 14.
LAR-lOlJ 9 jsi - 2~4233~
Although specific features of the invention are shown in some drawings and not others, this is for convenience only as each feature may be combined with any or all of the other features in accordance with the invention.
Other embodiments will occur to those skilled in the art and are within the following claims:
What is claimed is:
L~R-lOlJ 10 jsi
Claims (15)
1. A welding device for thermoplastics comprising:
a chamber for receiving a plastic welding rod at its inlet and issuing molten plastic at its outlet;
means for heating at least a portion of the rod in the chamber to the melting point; and means for feeding the plastic rod into the chamber to drive out melted plastic rod and replace it with more rod to be melted.
a chamber for receiving a plastic welding rod at its inlet and issuing molten plastic at its outlet;
means for heating at least a portion of the rod in the chamber to the melting point; and means for feeding the plastic rod into the chamber to drive out melted plastic rod and replace it with more rod to be melted.
2. The plastic welder of claim 1 further including means for preheating a surface to be welded.
3. The plastic welder of claim 2 in which said chamber outlet includes a foot with a first hole in it for issuing the molten plastic.
4. The plastic welder of claim 3 in which said foot includes a shoe with an aperture aligned with said hole for issuing the molten plastic.
5. The plastic welder of claim 4 in which said shoe is formed of a self-lubricating material.
6. The plastic welder of claim 5 in which said material is polytetrafluorethylene.
7. The plastic welder of claim 1 in which said chamber closely, slidingly receives the rod.
8. The plastic welder of claim 1 in which said means for heating includes a heat exchanger surface on the outside of said chamber.
9. The plastic welder of claim 8 in which said means for heating includes a heater element and a source of nonflammable gas for moving the gas over the heater element and then over the heat exchanger.
10. The plastic welder of claim 9 further including means for preheating a surface to be welded including a port proximate said outlet for issuing said heated gas.
11. The plastic welder of claim 10 in which said port receives said heated gas beyond its contact with said heat exchanger.
12. The plastic welder of claim 8 in which there is a housing surrounding said chamber and said heat exchanger surface includes at least one channel extending between the housing and chamber.
13. The plastic welder of claim 8 in which said gas is air.
14. The plastic welder of claim 1 in which said rod is solid.
15. A welding device for thermoplastics comprising:
a chamber for receiving a plastic welding rod and issuing molten plastic at its outlet;
a port proximate said outlet for issuing heated gas to preheat the surface to be welded;
means for moving a heated gas over said heat exchanger, to melt at least a portion of the plastic rod near the outlet and, through said port to preheat the surface to be welded; and means for feeding the plastic rod into the chamber to drive out the melted plastic rod and replace it with more rod to be melted.
a chamber for receiving a plastic welding rod and issuing molten plastic at its outlet;
a port proximate said outlet for issuing heated gas to preheat the surface to be welded;
means for moving a heated gas over said heat exchanger, to melt at least a portion of the plastic rod near the outlet and, through said port to preheat the surface to be welded; and means for feeding the plastic rod into the chamber to drive out the melted plastic rod and replace it with more rod to be melted.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US63649190A | 1990-12-31 | 1990-12-31 | |
| US07/636,491 | 1990-12-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2042335A1 true CA2042335A1 (en) | 1992-07-01 |
Family
ID=24552139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002042335A Abandoned CA2042335A1 (en) | 1990-12-31 | 1991-05-10 | Welding device for thermoplastics |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2042335A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021011785A1 (en) * | 2019-07-17 | 2021-01-21 | Signal Ventures, Inc. d/b/a Polyvance | Welder hose and wiring cable assembly and method with integral connectors and handle for quick replacement |
-
1991
- 1991-05-10 CA CA002042335A patent/CA2042335A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021011785A1 (en) * | 2019-07-17 | 2021-01-21 | Signal Ventures, Inc. d/b/a Polyvance | Welder hose and wiring cable assembly and method with integral connectors and handle for quick replacement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |