CA1073983A - Heating element terminal - Google Patents
Heating element terminalInfo
- Publication number
- CA1073983A CA1073983A CA272,685A CA272685A CA1073983A CA 1073983 A CA1073983 A CA 1073983A CA 272685 A CA272685 A CA 272685A CA 1073983 A CA1073983 A CA 1073983A
- Authority
- CA
- Canada
- Prior art keywords
- terminal
- insulating
- piece
- heating element
- central bore
- 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
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- Resistance Heating (AREA)
Abstract
Abstract of the Disclosure A heating element terminal comprising a tubular conductor extending through the central bore of a two-piece insulating clamp member and an aligned aperture of the heating element frame clamped therebetween. The tubular conductor includes a flattened terminal plate at a first end projecting outwardly of the heating element and at the second opposite end includes a compression sleeve portion extending axially therefrom and projecting inwardly of the heating element. An end of the resistance wire of the heating coil is inserted into the central bore of the inwardly pro-jecting compression sleeve portion which is crimped to secure the end of the resistance wire to the second end of the terminal.
The flattened plate formed at the first end of the terminal is drawn into abutment against the two-piece clamp member, and the second opposite end is similarly flattened at the point immediately adjacent the opposite side of the clamp member. The terminal is thus secured to the insulated two-piece clamp member to prevent substantial axial movement relative thereto, and to hold the two-pieces of the member together with the frame of the heating element securely clamped therebetween. The outwardly extending terminal plate is provided with an aperture to receive a screw or other fastening means for connection to a conductor leading to an electri-cal source.
The flattened plate formed at the first end of the terminal is drawn into abutment against the two-piece clamp member, and the second opposite end is similarly flattened at the point immediately adjacent the opposite side of the clamp member. The terminal is thus secured to the insulated two-piece clamp member to prevent substantial axial movement relative thereto, and to hold the two-pieces of the member together with the frame of the heating element securely clamped therebetween. The outwardly extending terminal plate is provided with an aperture to receive a screw or other fastening means for connection to a conductor leading to an electri-cal source.
Description
¦! Backqround of the-Invention -~! This invention relates to the field of terminals for electricl ii heating elements, in which the elements comprise a resistance coil supported within a frame on insulating grommets or disks, and with a terminal projecting outwardly of the frame for connection to an ¦ electrical source, the terminal being connected inwardly of the ¦ frame to the resistance coil. .
¦ In prior art devices, such means as bolts were used as ¦ terminals, with the threaded shank extending through the central 10 ¦ bore of a two-piece insulating member such as mated ceramic discs - ~4~
.
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-~o73983 and through the aperture of the frame of the heating element sandwiched between the ceramic disks. Lock nuts were pro-vided on each side of the two-piece insulating member for tightening thereagainst to securely clamp the disks together with the frame therebetween, and additional lock nuts were then threaded on the bolt shank to fasten the supply con-ductor to the bolt end extending outwardly from the frame and to fasten the resistance coil wire to the other bolt end extending inwardly of the heating element frame~ Such complicated terminal means are both expensive and time con-suming to properly install. A problem also arises with such terminals when the lock nuts are not properly tightened, resulting in a high resistance connection. The lock nuts may even become loose enough for either the external supply conductor or internal resistance wire to become electrically disconnected from the terminal.
The present invention overcomes such disadvantages and problems.
Summary of the Invention According to one aspect of the present invention an electrical terminal assembly comprises: ~
An electric terminal assembly comprising an inter- -grally formed conductive element, a tubular segment therein a flat surfaced segment at one end thereof, a central bore in said tubular segment open to the opposite end thereof, insulating means for mounting association with a panel member, aperture means through said insulating-means and panel member, said tubular segment being slidingly received in said aperture means with said opposite end projecting 30 from a first end of said aperture means, said flat surfaced segment projecting from a second end of said aperture means : .
:1~739~3 with an edge region of said flat surfaced segment abutting against a portion of said insulating means adjacent said aperture means at said second end sai~ insulating means including a two-piece matable insulating assembly, said aperture means includes an insulated central bore through said two-piece matable insulating assembly and a corresp~nd-ing hole through said panel, said panel being clamped between said two-piece insulating assembly, said insulating bore there-of providing an insulated passage-way through said hole of said panel, the diameter of said insulated passageway being slightly greater than the outer diameter of said tubular seg-ment for a snug sliding fit, said opposite end of said tubular segment extending from said first end of said aperture means being deformed adjacent said first end of said aperture means to cause the width of said tubular segment at such location to become greater than prior to such deformation and greater than said diameter of said insulated passageway, whereby said de-formed portion of said tubular segment provides an abutment against said insultating means at said first end while said flat surfaced segment provides an abutment against said insul-ating means at said second end thereby holding said two-piece insulating assembly together with said panel member clamped between, and an undeformed portion-of said tubular segment extending from said opposite end having said central bore open at said end to receive the terminating end of a conductor therein.
Brief Description of the Drawin~
Fig. 1 is a perspective view of an electrical heating element which includes terminals in accordance with this invention.
Fig. 2 is a side elevation view of terminal member in accordance with this invention before the compression sleeve end has been crimped.
Fig. 3 is a plan view of the terminal member , ~
,~
~)73gt~3 illustrated in Fig. 2.
Fig. 4 is a side elevation view of a fragement of *he heating element illustrated in Fig. 1, illustrating a terminal member insulatingly Supported in a front panel thereof having one end projecting exteriorly for connection to an electrical supply conductor and the opposite end pro-jecting interiorly for connection to the resistance wire of the heating element.
Fig. 5 is an exploded perspective view of a two-piece insulating and clamping member, a fragment of the heating element frame for clamping therebetween, and a terminal member as shown in Figs. 2 and 3 before insertion through the aligned bores of the two-piece insulating member and aperture of the heating element frame.
Fig. 6 is a side elevation view of the structure shown in Fig. 4 in which the resistance wire lS connected to the terminal member and crimped therein.
Fig. 7 is a front elevation view of the structure shown in Fig. 6.
,~
~ ~073983 1 Fig. 8 is a section taken on line 8-8 of Fig. 7.
¦ In prior art devices, such means as bolts were used as ¦ terminals, with the threaded shank extending through the central 10 ¦ bore of a two-piece insulating member such as mated ceramic discs - ~4~
.
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-~o73983 and through the aperture of the frame of the heating element sandwiched between the ceramic disks. Lock nuts were pro-vided on each side of the two-piece insulating member for tightening thereagainst to securely clamp the disks together with the frame therebetween, and additional lock nuts were then threaded on the bolt shank to fasten the supply con-ductor to the bolt end extending outwardly from the frame and to fasten the resistance coil wire to the other bolt end extending inwardly of the heating element frame~ Such complicated terminal means are both expensive and time con-suming to properly install. A problem also arises with such terminals when the lock nuts are not properly tightened, resulting in a high resistance connection. The lock nuts may even become loose enough for either the external supply conductor or internal resistance wire to become electrically disconnected from the terminal.
The present invention overcomes such disadvantages and problems.
Summary of the Invention According to one aspect of the present invention an electrical terminal assembly comprises: ~
An electric terminal assembly comprising an inter- -grally formed conductive element, a tubular segment therein a flat surfaced segment at one end thereof, a central bore in said tubular segment open to the opposite end thereof, insulating means for mounting association with a panel member, aperture means through said insulating-means and panel member, said tubular segment being slidingly received in said aperture means with said opposite end projecting 30 from a first end of said aperture means, said flat surfaced segment projecting from a second end of said aperture means : .
:1~739~3 with an edge region of said flat surfaced segment abutting against a portion of said insulating means adjacent said aperture means at said second end sai~ insulating means including a two-piece matable insulating assembly, said aperture means includes an insulated central bore through said two-piece matable insulating assembly and a corresp~nd-ing hole through said panel, said panel being clamped between said two-piece insulating assembly, said insulating bore there-of providing an insulated passage-way through said hole of said panel, the diameter of said insulated passageway being slightly greater than the outer diameter of said tubular seg-ment for a snug sliding fit, said opposite end of said tubular segment extending from said first end of said aperture means being deformed adjacent said first end of said aperture means to cause the width of said tubular segment at such location to become greater than prior to such deformation and greater than said diameter of said insulated passageway, whereby said de-formed portion of said tubular segment provides an abutment against said insultating means at said first end while said flat surfaced segment provides an abutment against said insul-ating means at said second end thereby holding said two-piece insulating assembly together with said panel member clamped between, and an undeformed portion-of said tubular segment extending from said opposite end having said central bore open at said end to receive the terminating end of a conductor therein.
Brief Description of the Drawin~
Fig. 1 is a perspective view of an electrical heating element which includes terminals in accordance with this invention.
Fig. 2 is a side elevation view of terminal member in accordance with this invention before the compression sleeve end has been crimped.
Fig. 3 is a plan view of the terminal member , ~
,~
~)73gt~3 illustrated in Fig. 2.
Fig. 4 is a side elevation view of a fragement of *he heating element illustrated in Fig. 1, illustrating a terminal member insulatingly Supported in a front panel thereof having one end projecting exteriorly for connection to an electrical supply conductor and the opposite end pro-jecting interiorly for connection to the resistance wire of the heating element.
Fig. 5 is an exploded perspective view of a two-piece insulating and clamping member, a fragment of the heating element frame for clamping therebetween, and a terminal member as shown in Figs. 2 and 3 before insertion through the aligned bores of the two-piece insulating member and aperture of the heating element frame.
Fig. 6 is a side elevation view of the structure shown in Fig. 4 in which the resistance wire lS connected to the terminal member and crimped therein.
Fig. 7 is a front elevation view of the structure shown in Fig. 6.
,~
~ ~073983 1 Fig. 8 is a section taken on line 8-8 of Fig. 7.
2 Fig. 9 is a side elevation of a modified terminal member
3 in accordance with this invention.
4 Fig. 10 is a plan view of the terminal member illustrated
5 in Fig. 9.
6 Fig. 11 is a side elevation of a two-piece insulating member, a fragment of a frame panel clamped therebetween, and 8 the modification of the terminal member as shown in Fig. 10.
9 Fig. 12 is a perspective view of another modified terminal member in accordance with this invention, showing one side.
11 Fig. 13 is a perspective view of the terminal member in Fig.
12 12 showing the other side.
13 Fig. 14 is a side elevation view of another modified terminal 14 member in accordance with this invention, shown mounted in a heating element with portions thereof shown in section.
16 Description of Preferred Embodiment 17 An electrical heating element 1 includes a frame 2 having 18 a front panel 3, a rear panel 4, side panels 5 and 6, and lateral 19 panels 7 and 8 spaced apart intermediately between front panel 3 and rear panel 4.
21 Ceramic insulating grommets 9 are mounted in apertures 10 22 spaced apart laterally in each lateral panel 7 and 8 and in rear 23 panel 4, each aperture 10 in one panel being axially aligned with 24 the corresponding aperture 10 of the other two of said panels.
A coiled resistance wire 11 extends through said insulating 26 grommets 9 to provide a heating grid when connected to an 27 electrical source at terminals 12 and 13. One end 14 of resistanc e 28 wire 11 is connected interiorly of the element frame 2 to termina~
29 12, and the other end 15 of the resistance wire 11 is connected 3o interiorly of the element frame 2 to terminal 13.
31 Terminals 12 and 13 extend through apertures 16 in front 32 ¦ panel 3 of frame 2, and are insulatingly supported therein by an 1~
r 1 insulating two-piece clamp member 17 comprising a first ceramic 2 disk 18 positioned on the interior facing side 19 of front panel 3 3, and a second ceramic disk 20 positioned on the exterior facing 4 side 21 of front panel 3.
The insulating ceramic disks of two-piece clamp member 17 6 are mated together, one having a projecting element centrally
9 Fig. 12 is a perspective view of another modified terminal member in accordance with this invention, showing one side.
11 Fig. 13 is a perspective view of the terminal member in Fig.
12 12 showing the other side.
13 Fig. 14 is a side elevation view of another modified terminal 14 member in accordance with this invention, shown mounted in a heating element with portions thereof shown in section.
16 Description of Preferred Embodiment 17 An electrical heating element 1 includes a frame 2 having 18 a front panel 3, a rear panel 4, side panels 5 and 6, and lateral 19 panels 7 and 8 spaced apart intermediately between front panel 3 and rear panel 4.
21 Ceramic insulating grommets 9 are mounted in apertures 10 22 spaced apart laterally in each lateral panel 7 and 8 and in rear 23 panel 4, each aperture 10 in one panel being axially aligned with 24 the corresponding aperture 10 of the other two of said panels.
A coiled resistance wire 11 extends through said insulating 26 grommets 9 to provide a heating grid when connected to an 27 electrical source at terminals 12 and 13. One end 14 of resistanc e 28 wire 11 is connected interiorly of the element frame 2 to termina~
29 12, and the other end 15 of the resistance wire 11 is connected 3o interiorly of the element frame 2 to terminal 13.
31 Terminals 12 and 13 extend through apertures 16 in front 32 ¦ panel 3 of frame 2, and are insulatingly supported therein by an 1~
r 1 insulating two-piece clamp member 17 comprising a first ceramic 2 disk 18 positioned on the interior facing side 19 of front panel 3 3, and a second ceramic disk 20 positioned on the exterior facing 4 side 21 of front panel 3.
The insulating ceramic disks of two-piece clamp member 17 6 are mated together, one having a projecting element centrally
7 thereof and the other having a corresponding recess, so when mated
8 together the two pieces or disks remain in axial alignment. In
9 the embodiments illustrated in the drawing, the ceramic disk 20 positioned on the exterior facing side includes the projecting 11 element 22 and ceramic disk 18 positioned on the interior facing 12 side includes a corresponding recess 23.
13 The cross-sectional dimension of projecting element 22 14 corresponds with the dimension of aperture 16 for seating engage-ment therein and projection therethrough.
16 Ceramic disk 20 includes an additional recess 24 of angular 17 configuration on the side opposite the side from which projecting 18 element 22 extends.
19 Each ceramic disk 18 and 20 includes a central bore 25 therethrough, the cross-sectional dimension of the bore 25 being 21 smaller than that of projecting element 22 through which it also 22 extends. Thus, when ceramic disk 20 is positioned adjacent 23 aperture 16 of frame panel 3 with projecting element 22 seated 24 therein and extending therethrough, and ceramic disk 18 is posi-tioned adjacent aperture 16 on the opposite side of frame panel 3 26 with its recess 23 receiving projecting element 22 therein, the 27 central bores 25 of each disk 18 and 20 are axially aligned to 28 provide a through passageway which is insulated by the ceramic 29 disks 18 and 20 from the frame panel 3.
3o The two-piece insulating clamp and support members 17 are 31 identical for both of the two apertures 16 in front panel 3 throug 32 which terminals 12 and 13 extend. Terminals 12 and 13 are also ;, (~ .
~c _~_ r ., ~ 1073983 1 essentially the same insofar as construction is concerned, and the 2 description of one applies equally to the other.
3 Terminal 12 comprises a tubular member 26 of copper, or other 4 electrically conductive metal, having a cross-sectional peripheral 5 ¦configuration and dimension corresponding to that of the aligned 6 ¦central bores 25 of ceramic disks 18 and 20, for a relatively snug ¦fit when inserted therethrough with a portion of tubular member 26 .
8 ¦extending from both ends of the two-piece members 17. The length 9 ¦of tubular member 26 is such that flattened terminal plate 27
13 The cross-sectional dimension of projecting element 22 14 corresponds with the dimension of aperture 16 for seating engage-ment therein and projection therethrough.
16 Ceramic disk 20 includes an additional recess 24 of angular 17 configuration on the side opposite the side from which projecting 18 element 22 extends.
19 Each ceramic disk 18 and 20 includes a central bore 25 therethrough, the cross-sectional dimension of the bore 25 being 21 smaller than that of projecting element 22 through which it also 22 extends. Thus, when ceramic disk 20 is positioned adjacent 23 aperture 16 of frame panel 3 with projecting element 22 seated 24 therein and extending therethrough, and ceramic disk 18 is posi-tioned adjacent aperture 16 on the opposite side of frame panel 3 26 with its recess 23 receiving projecting element 22 therein, the 27 central bores 25 of each disk 18 and 20 are axially aligned to 28 provide a through passageway which is insulated by the ceramic 29 disks 18 and 20 from the frame panel 3.
3o The two-piece insulating clamp and support members 17 are 31 identical for both of the two apertures 16 in front panel 3 throug 32 which terminals 12 and 13 extend. Terminals 12 and 13 are also ;, (~ .
~c _~_ r ., ~ 1073983 1 essentially the same insofar as construction is concerned, and the 2 description of one applies equally to the other.
3 Terminal 12 comprises a tubular member 26 of copper, or other 4 electrically conductive metal, having a cross-sectional peripheral 5 ¦configuration and dimension corresponding to that of the aligned 6 ¦central bores 25 of ceramic disks 18 and 20, for a relatively snug ¦fit when inserted therethrough with a portion of tubular member 26 .
8 ¦extending from both ends of the two-piece members 17. The length 9 ¦of tubular member 26 is such that flattened terminal plate 27
10 ¦can be formed on the end which projects outwardly or exteriorly
11 ¦of the heating element frame 2 and compression sleeve portion 28
12 ¦can project interiorly of the frame 2 a sufficient distance to be
13 ¦crimped by a crimping tool (not shown) after end 14 of resistance
14 ¦wire 11 has been inserted into the bore 29 of tubular member 26.
15 ¦When so crimped, the resistance wire is securely connected
16 ¦both electrically and mechanically to the terminal 12.
17 The tubular member 26, on which flattened terminal plate
18 27 has first been formed by a crimping or compressing operation,
19 ¦is inserted through the aligned central bores 25 of disks 18 and
20 ¦20 until the inner edges 30 of terminal plate 27 which extend
21 ¦ laterally beyond the peripheral wall 31 of tubular member 26
22 ¦become lodged in angular recess 24 and abut against the edge regio
23 ¦f ceramic disk 20 surrounding the entrance to central bore 25.
24 ~ When compressing or otherwise flattening the end of tubular
25 ¦member 26 to form terminal plate 27, the sides thereof flare
26 ¦outwardly as a result of such flattening and thus extend laterally
27 ¦or radially beyond the peripheral wall 31 of the remaining un-
28 ¦ flattened portion of tubular member 26.
29 ¦ . After tubular member 26 has been fully inserted through the 3o ¦ aligned central bores 25 of the mated two-piece insulating member, 31 with front panel 3 of the frame 2 sandwiched therebetween, and 32 ¦ the end 14 of resistance wire 11 has been inserted into the r I
1 compression sleeve portion 28 and crimped, the next step is to 2 flatten by crimping, compression or otherwise that portion of 3 ¦ tubular member 26 which lies immediately adjacent the entrance 4 ¦ region 32 of ceramic disk 18 to central bore 25, and outwardly 5 ¦ thereof. Such flattening operation causes the peripheral wall 31 6 ¦of tubular member 26 to bow outwardly radially beyond the 7 ¦corresponding dimension of central bore 25, thus effectively .
8 ¦providing a barrier or locking region 33 on tubular member 26 9 ¦which preventsaxia] movement of tubular member 26 relative to 10 ¦the two-piece insulating and c~amping member 17 in the direction 11 ¦of withdrawal therefrom. The flattened terminal plate 27 lodged 12 ¦in recess 24 on the opposite side of the said two-piece member 17, 13 ¦and abutting against the edge region of ceramic disk 20 surroundin 14 ¦the entrance to central bore 25 on that side, prevents further 15 ¦axial movement of the terminal member 26 relative to the two-piece 16 ¦member 17 in the direction of insertion therein.
17 In this ~anner, when locking region 33 is formed on tubular 18 member 26 in the manner stated, the terminal 12 is effectively 19 ¦locked in place insulated from the frame; and the two-piece 20¦ insulating and clamping member 17 is effectively clamped together 21 ¦with front panel 3 of the heating element frame 2 clamped 22 ¦therebetween.
23 ¦ The flattening operation which forms the said locking region 24 133 may be performed by a crimping tool. The same crimping tool 25 ¦may be used to perform the three separate operations of (1) 26 forming the flattened terminal plate 27; (2) crimping the end of 27 ¦resistance wire 11 in the compression sleeve portion 28; and 28 1~3~ flattening tubular member 26 to form locking region 33.
29 ¦Alternatively, each operation may be performed by a separate 3o ¦tool if desired for a part~cular purpose or a particular use. For 31 ~example, the flattened terminal plate 27 may be machined, coined, 32 land shaped to mate with a corresponding connecting element leading ~ .
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1 ¦from the electrical power source.
2 ¦ An aperture 34 may be provided in terminal plate 27 for 3 ¦connection of a supply conductor thereto by means of a screw or 4 ¦other connecting means.
5 ¦ A modified form of the terminal member in accordance with this invention is shown in Figs. 9 - 11.
7 The terminal member 120 comprises a unitary element of .
8 copper, or other electrically conductive metal, having a flat Y terminal plate 270 at one end, integrally joined to a tubular intermediate portion 260 having a central bore 290 extending 11 therethrough, which is in turn integrally joined to a compression 12 sleeve portion 280 at the opposite end. As lllustrated, the 13 compression sleeve portion 280 may be of smaller diameter, or 14 smaller peripheral dimension, than the tubular intermediate portion 260. The flat terminal plate 270 may be formed to lie 16 in a plane which bisects the cross-section of the tubular 17 intermediate portion 260. An aperture 340 may be provided in 18 flat terminal plate 270 to receive a screw or other connecting 19 means for connecting a supply conductor to the terminal plate 270.
The terminal member 120 is supported through apertures 16 21 of front panel 3 of heating element frame 2, and insulated 22 therefrom, by means of the two-piece insulating and clamping ?3 members 17 as described above with reference to terminal member 24 12. Connection of the end 14 of resistance wire 11 by crimping in compression sleeve portion 280 is likewise done in a manner 26 similar to that described for terminal member 12. That part 27 f tubular intermediate portion 260 lying immediately adjacent 28 the entrance region 32 of ceramic disk 18 is likewise flattened 29 to bow outwardly radially beyond the corresponding dimension of 3o central bore 25 in similar manner to that described for terminal 31 ¦member 12, to effectively lock the terminal member 120 axially in 32 ¦place through the two-piece insulating member 17, and to ___ I ~
`~ ~ 1073983 1 effectively clamp and hold the two-piece member 17 together with 2 front panel 3 of the heating element frame 2 sandwiched 3 ¦ therebetween.
4 ¦ A further modification of this invention is illustrated in 5 ¦ Figs. 12 and 13. A terminal member 121 is similar to terminal 6 ¦member 12 described above, and its use with two-piece clamp and 7 insulating member 17 for mounting in the front panel 3 of frame 2 8 is substantially the same as described with respect to terminal 9 ¦member 12. However, the flattened terminal plate 271 of terminal 10 ¦ 121 is modified, and includes a longitudinal rib 35 along the 11 ¦midline of surface 36. The opposite surface 37 includes a slight 12 ¦recess or depression 38 in the center region thereof.
13 ¦ The terminal member 121 may be formed from a length of copper 14 ¦tubing or tubing of other electrically conductive metal, having 15 ¦central bore 291 therein. Flattened plate 271 may be formed by 16 ¦pressing the cylindrical wall 311 of the length of tubing together 17 ¦until the interior sides of wall 311 are in mutual contact 18 ¦throughout substantially their full extent and the exterior sides 19 ¦form the substantially flat surfaces 36 and 37. In order to form 20 la terminal member in accordance with this invention by this 21 ¦method, it is desirable to provide a flow region for the excess 22 etal which results from pressing a circular portion of tubing 23 into a flat portion. This flow region in accordance with the 24 invention is provided by longitudinal rib 35 which is formed during the operation of pressing the end of the cylindrical 26 tubing into flattened end plate 271.
27 The longitudinal rib 35 serves the function of centering 28 terminal 121 when connecting to electrical clips having a 29 corresponding recess or channel to receive the longitudinal rib 3o 35. It also provides increased surface contact with such clips 31 for better frictional hold and improved electrical ocntact. The 32 depression 38 formed in surface 37 is located to receive a ~a~-1 i corresponding projection or raised portion formed on the inner 2 ¦surface of such electrical clips, for better retention of the 3 ¦clip on the terminal.
4 An additional modification is illustrated in Figure 14. A
terminal member 122 is provided, which is similar to terminal 6 members 12 and 121 described above but which includes a modified 7 external terminal end. The terminal member 122 is formed from a 8 ¦length of copper tubing, or tubing of other conductive metal ~ ¦having central bore 292 therein. The external terminal end is 10 ¦compressed by forging into a cylindrical shank 272 of smaller oute 11 ¦diameter than the outer diameter of the cylindrical wall 312 of 12 the original length of tubing. The excess metal resulting from 13 ¦compressing the external end to form cylindrical shank 272 is 14 ¦caused to flow rearwardly thereof and outwardly around the 15 ¦circumference of the tubing to form annular shoulder 273. The 16 ¦outer diameter of annular shoulder 273 is greater than the outer 17 ¦diameter of cylindrical wall 312, and accordingly provides an 18 ¦abutment means to bear against the edge region of ceramic disk 20 19 ¦surrounding central bore 25 therethrough. The cylindrical shank 20 ¦272 includes external threads 274 formed thereon for connection 21 ¦of an eye terminal on the shank 272 and tightening of a nut 22 ¦threaded on shank 272 against such eye terminal.
23 ¦ This modified terminal member 122 is used with two-piece 24 ¦clamp and insulating member 17 for mounting in the front panel 3 25 10f frame 2 in substantially the same manner as described with 22268 respect to terminal member 12.
32 ~
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1 compression sleeve portion 28 and crimped, the next step is to 2 flatten by crimping, compression or otherwise that portion of 3 ¦ tubular member 26 which lies immediately adjacent the entrance 4 ¦ region 32 of ceramic disk 18 to central bore 25, and outwardly 5 ¦ thereof. Such flattening operation causes the peripheral wall 31 6 ¦of tubular member 26 to bow outwardly radially beyond the 7 ¦corresponding dimension of central bore 25, thus effectively .
8 ¦providing a barrier or locking region 33 on tubular member 26 9 ¦which preventsaxia] movement of tubular member 26 relative to 10 ¦the two-piece insulating and c~amping member 17 in the direction 11 ¦of withdrawal therefrom. The flattened terminal plate 27 lodged 12 ¦in recess 24 on the opposite side of the said two-piece member 17, 13 ¦and abutting against the edge region of ceramic disk 20 surroundin 14 ¦the entrance to central bore 25 on that side, prevents further 15 ¦axial movement of the terminal member 26 relative to the two-piece 16 ¦member 17 in the direction of insertion therein.
17 In this ~anner, when locking region 33 is formed on tubular 18 member 26 in the manner stated, the terminal 12 is effectively 19 ¦locked in place insulated from the frame; and the two-piece 20¦ insulating and clamping member 17 is effectively clamped together 21 ¦with front panel 3 of the heating element frame 2 clamped 22 ¦therebetween.
23 ¦ The flattening operation which forms the said locking region 24 133 may be performed by a crimping tool. The same crimping tool 25 ¦may be used to perform the three separate operations of (1) 26 forming the flattened terminal plate 27; (2) crimping the end of 27 ¦resistance wire 11 in the compression sleeve portion 28; and 28 1~3~ flattening tubular member 26 to form locking region 33.
29 ¦Alternatively, each operation may be performed by a separate 3o ¦tool if desired for a part~cular purpose or a particular use. For 31 ~example, the flattened terminal plate 27 may be machined, coined, 32 land shaped to mate with a corresponding connecting element leading ~ .
l _~_ r --~~ ~ ~
1 ¦from the electrical power source.
2 ¦ An aperture 34 may be provided in terminal plate 27 for 3 ¦connection of a supply conductor thereto by means of a screw or 4 ¦other connecting means.
5 ¦ A modified form of the terminal member in accordance with this invention is shown in Figs. 9 - 11.
7 The terminal member 120 comprises a unitary element of .
8 copper, or other electrically conductive metal, having a flat Y terminal plate 270 at one end, integrally joined to a tubular intermediate portion 260 having a central bore 290 extending 11 therethrough, which is in turn integrally joined to a compression 12 sleeve portion 280 at the opposite end. As lllustrated, the 13 compression sleeve portion 280 may be of smaller diameter, or 14 smaller peripheral dimension, than the tubular intermediate portion 260. The flat terminal plate 270 may be formed to lie 16 in a plane which bisects the cross-section of the tubular 17 intermediate portion 260. An aperture 340 may be provided in 18 flat terminal plate 270 to receive a screw or other connecting 19 means for connecting a supply conductor to the terminal plate 270.
The terminal member 120 is supported through apertures 16 21 of front panel 3 of heating element frame 2, and insulated 22 therefrom, by means of the two-piece insulating and clamping ?3 members 17 as described above with reference to terminal member 24 12. Connection of the end 14 of resistance wire 11 by crimping in compression sleeve portion 280 is likewise done in a manner 26 similar to that described for terminal member 12. That part 27 f tubular intermediate portion 260 lying immediately adjacent 28 the entrance region 32 of ceramic disk 18 is likewise flattened 29 to bow outwardly radially beyond the corresponding dimension of 3o central bore 25 in similar manner to that described for terminal 31 ¦member 12, to effectively lock the terminal member 120 axially in 32 ¦place through the two-piece insulating member 17, and to ___ I ~
`~ ~ 1073983 1 effectively clamp and hold the two-piece member 17 together with 2 front panel 3 of the heating element frame 2 sandwiched 3 ¦ therebetween.
4 ¦ A further modification of this invention is illustrated in 5 ¦ Figs. 12 and 13. A terminal member 121 is similar to terminal 6 ¦member 12 described above, and its use with two-piece clamp and 7 insulating member 17 for mounting in the front panel 3 of frame 2 8 is substantially the same as described with respect to terminal 9 ¦member 12. However, the flattened terminal plate 271 of terminal 10 ¦ 121 is modified, and includes a longitudinal rib 35 along the 11 ¦midline of surface 36. The opposite surface 37 includes a slight 12 ¦recess or depression 38 in the center region thereof.
13 ¦ The terminal member 121 may be formed from a length of copper 14 ¦tubing or tubing of other electrically conductive metal, having 15 ¦central bore 291 therein. Flattened plate 271 may be formed by 16 ¦pressing the cylindrical wall 311 of the length of tubing together 17 ¦until the interior sides of wall 311 are in mutual contact 18 ¦throughout substantially their full extent and the exterior sides 19 ¦form the substantially flat surfaces 36 and 37. In order to form 20 la terminal member in accordance with this invention by this 21 ¦method, it is desirable to provide a flow region for the excess 22 etal which results from pressing a circular portion of tubing 23 into a flat portion. This flow region in accordance with the 24 invention is provided by longitudinal rib 35 which is formed during the operation of pressing the end of the cylindrical 26 tubing into flattened end plate 271.
27 The longitudinal rib 35 serves the function of centering 28 terminal 121 when connecting to electrical clips having a 29 corresponding recess or channel to receive the longitudinal rib 3o 35. It also provides increased surface contact with such clips 31 for better frictional hold and improved electrical ocntact. The 32 depression 38 formed in surface 37 is located to receive a ~a~-1 i corresponding projection or raised portion formed on the inner 2 ¦surface of such electrical clips, for better retention of the 3 ¦clip on the terminal.
4 An additional modification is illustrated in Figure 14. A
terminal member 122 is provided, which is similar to terminal 6 members 12 and 121 described above but which includes a modified 7 external terminal end. The terminal member 122 is formed from a 8 ¦length of copper tubing, or tubing of other conductive metal ~ ¦having central bore 292 therein. The external terminal end is 10 ¦compressed by forging into a cylindrical shank 272 of smaller oute 11 ¦diameter than the outer diameter of the cylindrical wall 312 of 12 the original length of tubing. The excess metal resulting from 13 ¦compressing the external end to form cylindrical shank 272 is 14 ¦caused to flow rearwardly thereof and outwardly around the 15 ¦circumference of the tubing to form annular shoulder 273. The 16 ¦outer diameter of annular shoulder 273 is greater than the outer 17 ¦diameter of cylindrical wall 312, and accordingly provides an 18 ¦abutment means to bear against the edge region of ceramic disk 20 19 ¦surrounding central bore 25 therethrough. The cylindrical shank 20 ¦272 includes external threads 274 formed thereon for connection 21 ¦of an eye terminal on the shank 272 and tightening of a nut 22 ¦threaded on shank 272 against such eye terminal.
23 ¦ This modified terminal member 122 is used with two-piece 24 ¦clamp and insulating member 17 for mounting in the front panel 3 25 10f frame 2 in substantially the same manner as described with 22268 respect to terminal member 12.
32 ~
I , _~_ r
Claims (2)
1. An electric terminal assembly comprising an integrally formed conductive element, a tubular segment therein, a flat surfaced segment at one end thereof, a central bore in said tubular segment open to the opposite end thereof, insulating means for mounting association with a panel member, aperture means through said insulating means and panel member, said tubular segment being slidingly received in said aperture means with said opposite end pro-jecting from a first end of said aperture means, said flat surfaced segment projecting from a second end of said aperture means with an edge region of said flat surfaced segment abutting against a portion of said insulating means adjacent said aperture means at said second end said insul-ating means including a two-piece matable insulating assembly said aperture means includes an insulated central bore through said two-piece matable insulating assembly and a corresponding hole through said panel, said panel being clamped between said two-piece insulating assembly, said insultated bore thereof providing an insulated passage-way through said hole of said panel, the diameter of said insul-ated passageway being slightly greater than the outer dia-meter of said tubular segment for a snug sliding fit, said opposite end of said tubular segment extending from said first end of said aperture means being deformed adjacent said first end of said aperture means to cause the width of said tubular segment at such location to become greater than prior to such deformation and greater than said dia-meter of said insulated passageway, whereby said deformed portion of said tubular segment provides an abutment against said insulating means at said first end while said flat surfaced segment provides an abutment against said insulating means at said second end thereby holding said two-piece insul-ating assembly together with said panel member clamped between, and an undeformed portion of said tubular segment extending from said opposite end having said central bore open at said end to receive the terminating end of a conductor therein.
2. An electric terminal assembly as set forth in claim 1 wherein said two-piece insulating assembly comprises first and second ceramic disks having central bores there-through, said first disk including a projecting member ex-tending from a clamping side thereof coaxially surrounding said central bore of said disk, said second disk including a corresponding recess opening to a corresponding clamping side thereof to receive said projecting member therein.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US67237276A | 1976-03-31 | 1976-03-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1073983A true CA1073983A (en) | 1980-03-18 |
Family
ID=24698278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA272,685A Expired CA1073983A (en) | 1976-03-31 | 1977-02-25 | Heating element terminal |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1073983A (en) |
| MX (1) | MX144359A (en) |
-
1977
- 1977-02-25 CA CA272,685A patent/CA1073983A/en not_active Expired
- 1977-03-15 MX MX16837177A patent/MX144359A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| MX144359A (en) | 1981-10-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |