CA1177542A - Induction heating ring with resilient button connections - Google Patents
Induction heating ring with resilient button connectionsInfo
- Publication number
- CA1177542A CA1177542A CA000398501A CA398501A CA1177542A CA 1177542 A CA1177542 A CA 1177542A CA 000398501 A CA000398501 A CA 000398501A CA 398501 A CA398501 A CA 398501A CA 1177542 A CA1177542 A CA 1177542A
- Authority
- CA
- Canada
- Prior art keywords
- contactor box
- box
- female
- male
- coil contacts
- 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
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
Abstract
INDUCTION HEATING RING WITH
RESILIENT BUTTON CONNECTIONS
ABSTRACT OF THE DISCLOSURE
An axially extending induction heating ring, adapted to removably sur-round a pipe, is provided with two arcuate frames hingely connected in end to end circumferential relationship, these frames having a pair of free ends adapted to be opened for placing the frames around the pipe. A plurality of electrically conducting wires are carried upon the frames across the axial widththereof and extending circumferentially between the free ends. The ring is especially provided with an improved electrical coupling assembly comprising a male contactor box including two projections adapted to be received in two corresponding holes in the female contactor box, each contactor box being provided with a plurality of coil contacts each connected to an end of a wire, each of the coil contacts of one contactor box being received in a recess containing a resilient O-ring whereby, when the male contactor box and the female contacto box are placed in an interfitting relationship, the coil contacts of the male contactor box are held resiliently against the coil contacts of the female contactor box to provide electrical continuity for the thus-connected wires.
RESILIENT BUTTON CONNECTIONS
ABSTRACT OF THE DISCLOSURE
An axially extending induction heating ring, adapted to removably sur-round a pipe, is provided with two arcuate frames hingely connected in end to end circumferential relationship, these frames having a pair of free ends adapted to be opened for placing the frames around the pipe. A plurality of electrically conducting wires are carried upon the frames across the axial widththereof and extending circumferentially between the free ends. The ring is especially provided with an improved electrical coupling assembly comprising a male contactor box including two projections adapted to be received in two corresponding holes in the female contactor box, each contactor box being provided with a plurality of coil contacts each connected to an end of a wire, each of the coil contacts of one contactor box being received in a recess containing a resilient O-ring whereby, when the male contactor box and the female contacto box are placed in an interfitting relationship, the coil contacts of the male contactor box are held resiliently against the coil contacts of the female contactor box to provide electrical continuity for the thus-connected wires.
Description
7~
INDUCTI()N EIEATI~ RING WITH
RESILIENT BUTTON CONNECTIONS
Background of the Invention 1. Field of the Invention The present invention relates to an improved electrical coupling assembly for use with an induction heating coil or ring. More particularly, the present 5 invention relates to a pair of interlocking contactor box assemblies mounted on the ends of a hinged heating ring.
INDUCTI()N EIEATI~ RING WITH
RESILIENT BUTTON CONNECTIONS
Background of the Invention 1. Field of the Invention The present invention relates to an improved electrical coupling assembly for use with an induction heating coil or ring. More particularly, the present 5 invention relates to a pair of interlocking contactor box assemblies mounted on the ends of a hinged heating ring.
2. Prior Art Various induction heating means which circumferentially engage tubing or the like during a welding process are common in the prior art. One prior art patent, U.S. Patent No. 3,311,732 to ~tein et al, discloses a device which applies heat by means of electrical induction in precise predetermined amounts for in-place brazing of steel tubing. Other prior art references disclose various devices for the butt welding of the ends of rmetal tubes through the employment of high frequency electrical induction to heat the tube end metal to welding 15 temparature.
tn many processes, in the fabrication and construction of pipe~ or pipelines, or in the application of coating and tlle like to such pipes, it is frequently desirable to preheat the pipe in the predetermined area or zone to betreated such as in welding, pipe coating and similar processes. Such zonal 20 heating has been effected in the past, for example, by applying a torch flame to the area to produce the desired heat. However, the heating effects produced by a torch flame are highly localized, and are not suitable for many processes which require a uniform heat application, for instance, around the circumfer-ence of the pipe.
7~7~
For example, in field performed proces~es in which a coatirlg of epoxy or the like is sprayed onto a previously welded pipe joint, the entire area of the joint to be coated should be uniformly and evenly preheated to a sufficiently high temperature prior to the application of the coating material to enable a 5 desired uniform epoxy coat to be deposited. Such coating processes are used, for instance, in applications in which pipes are providecl with a protective epoxy coat, except for its ends at which welding to adjacent pipe sections in the field is effected. After the welding process, the uncoated joint is coated with epoxy to thereby effect a pipe coated along the entire length of the pipe, including 10 the welded junction, for resisting corrvsion and other destructive influences to which the pipe may be subjected. Uneven heat, such as by torch preheating, may produce uneven or unreliable coatings, which may result in areas of the pipe being undesirably exposed to the elements, resulting in premature pipeline failures. The torch preheating also is slow to perform, usually done manually, 15 and requires carrying the torch and its accessories from each joint to the next.
7~
Summary of the Invention The present invention comprises an improved electrical coupling assembly for use with an induction heating collar. The collar is adapted to be placed around a pipe for heating the welded joints by induction heating. The heating 5 collar or ring includes a pair of arcuate frame member which are hinged at thetop. At the bottom ends of each frame members opposite from the hinge are electrical connections or couplings, which provide electrical eontinuity througha plurality of electrically conducting wires which are carried upon the frame.
The coupling assembly includes a male contactor box and a female contactor 10 box.
The male contactor box is provided with two plugs or guide pins which are adapted to be received in respective holes in the female contactor box. Both contactor boxes are provided with a plurality of coil contact buttons; such that, when the two contactor boxeæ are joined together in the above interfitting 15 relationship, the buttons on one contactor box are in engagement with the buttons on the other contactor box. Each button is disposed in a recess which includes a compression lug which surrounds the end of a cable and which permits connection between a shank on the button and the strands of the cable.
In the recesses of one contactor box, a resilient O-ring is received in a groove20 behind each button. These O-rings are adapted to be compressed when the heating ring is closed. Thus, the buttos of one contactor box are held resiliently against the buttons of the other contactor box.
Brief Description of the Drawings Figure 1 is a front elevational view of an induction heating ring constructed in accordance with the present invention, shown in a closed positionaround a pipe which is indicated in cross-section;
Figure 2 is a side elevational view of the induction heating ring;
Figure 3 is R plan view of the male contactor box assembly of the present invention;
Figure 4 is an elevational view of the male contactor box assembly shown in Figure 3;
Figure S is an elevational view of the female contactor box assembly of the present invention;
Figure 6 is a cross-sectional view taken along section line 6-6 of Figure S;
Figure 7 is a cross-sectional view taken along section line 7-7 of Figure 4;
and Figure 8 is a cross-sectional view taken along section 8-8 of Figure ~L.
7~ r2 Detailed Description of the Preferred Embodiments As shown in Pigures 1 and 2, the present invention comprises a hinged circular collar or ring 10 which is adapted to be placed around a pipe 12 for heating the welded joints by induction heating. The heating ring 10 extends 5 over the pipe 12 both circumferentially and axially (parallel to the axis of the pipe). The ring 10 is comprised of a plurality of arcuate shaped sections, such as the two semi-circular frames 14 and 16 (as shown in Figure 1), which are hinged together at the top. The two frames 14 and 16 are substantially identical with the exception of their interconnecting lower ends (to be 10 described hereinafter).
Each frame, for example 14, is formed by a pair of semi-circular plates 18 and 20 which are interconnected and held in spaced parallel relationship by means of a plurality of outer side spacer bars 22 which are bolted to plates 18 and 20 by means of bolts 23. Frame 16 is formed by a pair of semi-circular plates 24 and 26 (only plate 24 is shown in the drawings) which are connected and held in spaced parallel relationship by means of a plurality of outer side spacer bars (not shown) which are identical to the side spacer bars 22 and whichare bolted to the plates 24 and 26 by means of bolts 28.
Each frame 14 and 16 is provided with a pair oE ciraularly arranged and 20 parallel rows of cable spacer bars 30 which are bolted onto the semi-circularplates 18 and 20, and 24 and 26 by means of bolts 31. A plurality of electrically conducting wires or coils 32 are wo~md on the frames 14 and 16 between the two rows of cable spacer bars 30. ~s best shown in the lower portion of Figure 2~ the radi~l outermost spacer bar 30 is provided with circular eut-ollts to 25 receive the cables between the mating pairs of bars 30. The heating ring lû is 7~
also provided with an asbestos cloth 34 which overlies and is held in place by means of a plurality of cloth retainers 36.
The hinged connection between the semi-circular frames 14 and 16, comprises a hinge frame or bonnet 38 which includes a pair of triangular plates 40 and 42 disposed outside the frames 14 and 16 and interconnected by means of a securing rod or lifting bar 44 which is bolted to the triangular plates 40 and ~2 by means of bolts 45. The triangular plate 40 is connected to the semi-circular plates 18 and 24 by means of bolts 46 and d~8, respectively, which form forward pivot points 46 and 48, respectively. Likewise, triangular plate 42 is connectedto semi-circular plates 20 and 26 (only plate 20 is shown in the drawings) by means of bolts 50 and 52, respectively (only bolt 50 is shown in the drawings).
Bolts 50 and 52 form the rear pivot points 50 and 52, respectively. Each of the bolts, 46, 48, 50 and 52, is provided with a pivot bushing 54 (only two of whichare shown).
As previously described, the heating ring 10 is provided with a plurality of wires 32 which are carried on the frame between the pairs of cable spacer bars 30 and cover substantially the entire axial width of the ring as shown in Figure2. The inner wires extend for the full circumference of ring 10 from a male contactor box 60 to a female contactor box 62. The two contactor boxes 60 and 62 are mounted on the lower ends of the frames i4 and 16, respectively so as to be opposed to the hinge frame 38 tsee Figure 1). The two axial outer or end wires 32 are each provided with pigtail wires 64, as shown in Figure 29 which are employed as terminals.
Referring to the details in Figures 3, 4, 7 and 8, the male contactor box 60 comprises a front insulator plate 66, a middle plate 68 and a back insulator plate 70, which are joined together by means of a plurality of bolts 72. The male contactor box 60 also includes a pair of projections 74 which are employed as plugs or guide pins. Box 60 is provided with a plurality of coil ConlaCtS 76 which are aligned in a row. The coil contact or button 76 is disposed in a recess which includes a compression lug 78 (see Figure 7). Each of the buttons 76 is provided with a threaded shank 77 which is adapted to be received in the end of a wire 32 (not shown in this figure) so that each button is electrically connected to a corresponding wire 32. More particulary, the compression lug 7~ is adapted to be received over the end of a wire or cable 32 (not shown in Figure 7); in this regard, it must be understood that the conductor inside the cables 32 is not a sol;d conductor but made of strands of wire. Therefore each compression lug firmly surrounds the strands and permits a close grouping thereof so that the shank 77 of the button 76 can be s--rewed into the tight grouping of strands as thus provided by the compression lug 78.
Referring to Figures 5 and 6, the structure o-f the female contactor box 62 is essentially the same as he male contactor box 60 just described except that the female ~ontactor box is provided with two recesses 88 adapted to receive the prongs or projections 74 of the male box when the ring 10 is placed in the closed position as shown in Figure 1. Otherwise, the female box is provided with plates 80, 82 and 84 which correspond with plates 66, 68 and 70, respectively; button 90, prong 91 and compression lug 92 correspond exactly with button 76, prong 77 and compression lug 78, respectively, previously described. One other difference, however3 exists between the female contactor box 62 and the male contactor box 60; that is, an O ring 93 is provided in a lS circumferential groove in the recess behind each button 90. These O-rings 93are compressed somewhat when the heating ring 10 is placed in the closed position shown in Figure 1. Therefore, it is the O-rings 93 that provide the resilient urging of the buttons of one contactor box against the buttons of the other contactor bo-x.
When the heating ring 10 is placed upon and around a pipe 12 as shown in Figure 1, a set of top rollers 96 will support ring 10 on the pipe 12 and will also permit the ring to be rolled along the length of the pipe for a limited distance.
The top rollers 96 are each mounted on a top wheel mount 98, the latter mounts being bolted to a portion of the triangular plates 40 and 42 (see Figure 2). A set of side roll~rs 100 are mounted each on a side wheel mount 102 affixed to a portion of the side plates 18 and 22, and 24 and 26. The side rollers 100 do not- necessarily contact the side of the pipe 12, but serve to keep the ring 10 generally centrally disposed around the pipe and prevent scraping of the sides of the ring against the sides of the pipe.
In operation, the male contactor box 60 and the female contactor box 62 are placed in the interfitting relationship described above. This coupling arrangement provides electrical continuity through the wires 32 by means of the resilient contact between the buttons 76 on box 60 and the buttons 90 on box 62.
~7~
Whereas the present invention has been described in particular relation to the drawings attached hereto, it should be understood that other and further modifications, apart from those shown or suggested herein, may be made within the spirit and scope of this invention.
tn many processes, in the fabrication and construction of pipe~ or pipelines, or in the application of coating and tlle like to such pipes, it is frequently desirable to preheat the pipe in the predetermined area or zone to betreated such as in welding, pipe coating and similar processes. Such zonal 20 heating has been effected in the past, for example, by applying a torch flame to the area to produce the desired heat. However, the heating effects produced by a torch flame are highly localized, and are not suitable for many processes which require a uniform heat application, for instance, around the circumfer-ence of the pipe.
7~7~
For example, in field performed proces~es in which a coatirlg of epoxy or the like is sprayed onto a previously welded pipe joint, the entire area of the joint to be coated should be uniformly and evenly preheated to a sufficiently high temperature prior to the application of the coating material to enable a 5 desired uniform epoxy coat to be deposited. Such coating processes are used, for instance, in applications in which pipes are providecl with a protective epoxy coat, except for its ends at which welding to adjacent pipe sections in the field is effected. After the welding process, the uncoated joint is coated with epoxy to thereby effect a pipe coated along the entire length of the pipe, including 10 the welded junction, for resisting corrvsion and other destructive influences to which the pipe may be subjected. Uneven heat, such as by torch preheating, may produce uneven or unreliable coatings, which may result in areas of the pipe being undesirably exposed to the elements, resulting in premature pipeline failures. The torch preheating also is slow to perform, usually done manually, 15 and requires carrying the torch and its accessories from each joint to the next.
7~
Summary of the Invention The present invention comprises an improved electrical coupling assembly for use with an induction heating collar. The collar is adapted to be placed around a pipe for heating the welded joints by induction heating. The heating 5 collar or ring includes a pair of arcuate frame member which are hinged at thetop. At the bottom ends of each frame members opposite from the hinge are electrical connections or couplings, which provide electrical eontinuity througha plurality of electrically conducting wires which are carried upon the frame.
The coupling assembly includes a male contactor box and a female contactor 10 box.
The male contactor box is provided with two plugs or guide pins which are adapted to be received in respective holes in the female contactor box. Both contactor boxes are provided with a plurality of coil contact buttons; such that, when the two contactor boxeæ are joined together in the above interfitting 15 relationship, the buttons on one contactor box are in engagement with the buttons on the other contactor box. Each button is disposed in a recess which includes a compression lug which surrounds the end of a cable and which permits connection between a shank on the button and the strands of the cable.
In the recesses of one contactor box, a resilient O-ring is received in a groove20 behind each button. These O-rings are adapted to be compressed when the heating ring is closed. Thus, the buttos of one contactor box are held resiliently against the buttons of the other contactor box.
Brief Description of the Drawings Figure 1 is a front elevational view of an induction heating ring constructed in accordance with the present invention, shown in a closed positionaround a pipe which is indicated in cross-section;
Figure 2 is a side elevational view of the induction heating ring;
Figure 3 is R plan view of the male contactor box assembly of the present invention;
Figure 4 is an elevational view of the male contactor box assembly shown in Figure 3;
Figure S is an elevational view of the female contactor box assembly of the present invention;
Figure 6 is a cross-sectional view taken along section line 6-6 of Figure S;
Figure 7 is a cross-sectional view taken along section line 7-7 of Figure 4;
and Figure 8 is a cross-sectional view taken along section 8-8 of Figure ~L.
7~ r2 Detailed Description of the Preferred Embodiments As shown in Pigures 1 and 2, the present invention comprises a hinged circular collar or ring 10 which is adapted to be placed around a pipe 12 for heating the welded joints by induction heating. The heating ring 10 extends 5 over the pipe 12 both circumferentially and axially (parallel to the axis of the pipe). The ring 10 is comprised of a plurality of arcuate shaped sections, such as the two semi-circular frames 14 and 16 (as shown in Figure 1), which are hinged together at the top. The two frames 14 and 16 are substantially identical with the exception of their interconnecting lower ends (to be 10 described hereinafter).
Each frame, for example 14, is formed by a pair of semi-circular plates 18 and 20 which are interconnected and held in spaced parallel relationship by means of a plurality of outer side spacer bars 22 which are bolted to plates 18 and 20 by means of bolts 23. Frame 16 is formed by a pair of semi-circular plates 24 and 26 (only plate 24 is shown in the drawings) which are connected and held in spaced parallel relationship by means of a plurality of outer side spacer bars (not shown) which are identical to the side spacer bars 22 and whichare bolted to the plates 24 and 26 by means of bolts 28.
Each frame 14 and 16 is provided with a pair oE ciraularly arranged and 20 parallel rows of cable spacer bars 30 which are bolted onto the semi-circularplates 18 and 20, and 24 and 26 by means of bolts 31. A plurality of electrically conducting wires or coils 32 are wo~md on the frames 14 and 16 between the two rows of cable spacer bars 30. ~s best shown in the lower portion of Figure 2~ the radi~l outermost spacer bar 30 is provided with circular eut-ollts to 25 receive the cables between the mating pairs of bars 30. The heating ring lû is 7~
also provided with an asbestos cloth 34 which overlies and is held in place by means of a plurality of cloth retainers 36.
The hinged connection between the semi-circular frames 14 and 16, comprises a hinge frame or bonnet 38 which includes a pair of triangular plates 40 and 42 disposed outside the frames 14 and 16 and interconnected by means of a securing rod or lifting bar 44 which is bolted to the triangular plates 40 and ~2 by means of bolts 45. The triangular plate 40 is connected to the semi-circular plates 18 and 24 by means of bolts 46 and d~8, respectively, which form forward pivot points 46 and 48, respectively. Likewise, triangular plate 42 is connectedto semi-circular plates 20 and 26 (only plate 20 is shown in the drawings) by means of bolts 50 and 52, respectively (only bolt 50 is shown in the drawings).
Bolts 50 and 52 form the rear pivot points 50 and 52, respectively. Each of the bolts, 46, 48, 50 and 52, is provided with a pivot bushing 54 (only two of whichare shown).
As previously described, the heating ring 10 is provided with a plurality of wires 32 which are carried on the frame between the pairs of cable spacer bars 30 and cover substantially the entire axial width of the ring as shown in Figure2. The inner wires extend for the full circumference of ring 10 from a male contactor box 60 to a female contactor box 62. The two contactor boxes 60 and 62 are mounted on the lower ends of the frames i4 and 16, respectively so as to be opposed to the hinge frame 38 tsee Figure 1). The two axial outer or end wires 32 are each provided with pigtail wires 64, as shown in Figure 29 which are employed as terminals.
Referring to the details in Figures 3, 4, 7 and 8, the male contactor box 60 comprises a front insulator plate 66, a middle plate 68 and a back insulator plate 70, which are joined together by means of a plurality of bolts 72. The male contactor box 60 also includes a pair of projections 74 which are employed as plugs or guide pins. Box 60 is provided with a plurality of coil ConlaCtS 76 which are aligned in a row. The coil contact or button 76 is disposed in a recess which includes a compression lug 78 (see Figure 7). Each of the buttons 76 is provided with a threaded shank 77 which is adapted to be received in the end of a wire 32 (not shown in this figure) so that each button is electrically connected to a corresponding wire 32. More particulary, the compression lug 7~ is adapted to be received over the end of a wire or cable 32 (not shown in Figure 7); in this regard, it must be understood that the conductor inside the cables 32 is not a sol;d conductor but made of strands of wire. Therefore each compression lug firmly surrounds the strands and permits a close grouping thereof so that the shank 77 of the button 76 can be s--rewed into the tight grouping of strands as thus provided by the compression lug 78.
Referring to Figures 5 and 6, the structure o-f the female contactor box 62 is essentially the same as he male contactor box 60 just described except that the female ~ontactor box is provided with two recesses 88 adapted to receive the prongs or projections 74 of the male box when the ring 10 is placed in the closed position as shown in Figure 1. Otherwise, the female box is provided with plates 80, 82 and 84 which correspond with plates 66, 68 and 70, respectively; button 90, prong 91 and compression lug 92 correspond exactly with button 76, prong 77 and compression lug 78, respectively, previously described. One other difference, however3 exists between the female contactor box 62 and the male contactor box 60; that is, an O ring 93 is provided in a lS circumferential groove in the recess behind each button 90. These O-rings 93are compressed somewhat when the heating ring 10 is placed in the closed position shown in Figure 1. Therefore, it is the O-rings 93 that provide the resilient urging of the buttons of one contactor box against the buttons of the other contactor bo-x.
When the heating ring 10 is placed upon and around a pipe 12 as shown in Figure 1, a set of top rollers 96 will support ring 10 on the pipe 12 and will also permit the ring to be rolled along the length of the pipe for a limited distance.
The top rollers 96 are each mounted on a top wheel mount 98, the latter mounts being bolted to a portion of the triangular plates 40 and 42 (see Figure 2). A set of side roll~rs 100 are mounted each on a side wheel mount 102 affixed to a portion of the side plates 18 and 22, and 24 and 26. The side rollers 100 do not- necessarily contact the side of the pipe 12, but serve to keep the ring 10 generally centrally disposed around the pipe and prevent scraping of the sides of the ring against the sides of the pipe.
In operation, the male contactor box 60 and the female contactor box 62 are placed in the interfitting relationship described above. This coupling arrangement provides electrical continuity through the wires 32 by means of the resilient contact between the buttons 76 on box 60 and the buttons 90 on box 62.
~7~
Whereas the present invention has been described in particular relation to the drawings attached hereto, it should be understood that other and further modifications, apart from those shown or suggested herein, may be made within the spirit and scope of this invention.
Claims (3)
1. In combination with an axially extending induction heating ring adapted to removably surround a pipe and having at least two arcuate frames hingely connected in end to end circumferential relationship and having a pair of free ends adapted to be opened for placing the frames around the pipe, and a plurality of electrically conducting wires carried upon said frames across the axial width thereof and extending circumferentially between the free ends; an improved electrical coupling assembly comprising a male contactor box mount-ed on one free end and a female contactor box mounted on the other free end, said male contactor box including at least two projections adapted to be received in at least two corresponding holes in said female contactor box, each contactor box being provided with a plurality of coil contacts each connected toan end of a wire, each of the coil contacts of one contactor box being received in a recess containing a resilient means, whereby when said male contactor box and said female contactor box are placed in an interfitting relationship, the coil contacts of said male contactor box are held resiliently against the coil contacts of said female contactor box.
2. An improved electrical coupling assembly as set forth in Claim 1 wherein said resilient means comprises an O-ring disposed in each recess behind the coilcontact.
3. An improved electrical coupling as set forth in Claim 1 and being further characterized by said coil contacts being button shaped and aligned axially on said male contactor box and on said female contactor box.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US29552581A | 1981-08-24 | 1981-08-24 | |
| US295,525 | 1981-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1177542A true CA1177542A (en) | 1984-11-06 |
Family
ID=23138073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000398501A Expired CA1177542A (en) | 1981-08-24 | 1982-03-16 | Induction heating ring with resilient button connections |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5835891A (en) |
| AU (1) | AU8173582A (en) |
| CA (1) | CA1177542A (en) |
| GB (1) | GB2104359B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59161733A (en) * | 1983-03-07 | 1984-09-12 | Oki Electric Ind Co Ltd | Pattern detecting circuit |
| US20210362279A1 (en) * | 2017-10-10 | 2021-11-25 | Siemens Aktiengesellschaft | Induction heating with a flexible heating jacket, for assembly or disassembly of components in a turbine engine |
| CN111421265B (en) * | 2020-03-25 | 2021-04-09 | 武汉理工大学 | Pre-welding preheating and post-welding heat treatment device for tank body |
-
1982
- 1982-03-16 CA CA000398501A patent/CA1177542A/en not_active Expired
- 1982-03-19 AU AU81735/82A patent/AU8173582A/en not_active Abandoned
- 1982-05-11 JP JP7910082A patent/JPS5835891A/en active Pending
- 1982-06-14 GB GB08217183A patent/GB2104359B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2104359B (en) | 1985-06-05 |
| JPS5835891A (en) | 1983-03-02 |
| GB2104359A (en) | 1983-03-02 |
| AU8173582A (en) | 1983-03-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |