JPS58198885A - Terminal fitting for ignition plug - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to terminal fittings for ignition cords used in internal combustion engines for automobiles, pulse combustion furnaces, etc. This invention relates to a terminal fitting for an ignition cord used for connecting to a socket of a cap, etc.

[Background technology]

Various types of ignition cord terminal fittings are known for connecting the ignition cord to a spark plug or other similarly shaped device as well as for removably connecting the ignition cord to an automotive distributor. Such terminal fittings are typically of the expandable, split type that can fit around the circumference of a male connector, such as a spark plug, or that can be press-fitted into a conventional cup-shaped tubular socket of an automotive distributor. The swage is in the form of a tubular section, the swage portion of which is adapted to swage around the end of an ignition cord having a conventional oppositional core, and the swage portion is adapted to swage around the end of an ignition cord having a conventional oppositional core. The section is folded back toward the jacket to form a conventional "peel-and-fold" type connection, and the intermediate web section of the terminal fitting connects the tubular section and the caulked section to each other. ing.

The split tubular section is provided with various spring means for locking the tubular section to the ignition Zolag terminal or the like. The spring means may be made of, for example, a C-shaped spring steel member fitted tightly into the tubular section, and may include a protrusion extending inwardly through an opening provided in the tubular section and abutting a spark plug terminal or the like;
Alternatively, it includes an inwardly displaced wall portion. A notch is provided in the middle of the terminal fitting so that the terminal fitting can be bent when a bendable terminal fitting is required, and the desired bending type can be formed. To aid in maintenance, reinforcing means are provided which extend to the swage or are adapted to lock together. The crimping portion of the terminal fitting may be provided with various means, such as ridges, protruding tongues, or other similar structures, to increase the locking or retention force on the outer jacket of the ignition cord. In addition, there is no risk that the ignition cord will be pulled out from the terminal fitting when the terminal fitting is removed by pulling the ignition cord. This type of damage occurs because the retention force provided by the expandable split tubular section (7) is unpredictable and uncontrollable. In addition, conventional terminal fittings for ignition cords are made of two parts, and in order to repeatedly control the holding force obtained by the expandable tubular part, the expandable tubular connection part is separated from the caulking part. Since they need to be made of strong and rigid materials, the caulking portion and the tubular connection portion are formed from separate pieces of different materials.

DISCLOSURE OF THE INVENTION The present invention aims to overcome the above-mentioned as well as other drawbacks of the prior art.

The present invention provides an integrated terminal fitting for an ignition cord. The crimped portion is provided with integral spring means to provide an easily controllable and sustainable retention force without expansion, and the crimped portion is configured to provide an extremely high retention force between the ignition cord and the connector. The intermediate portion connects the barrel portion and the caulking portion to each other, and the intermediate portion includes a straight terminal metal (8) without adversely affecting the rigidity of the tool. A plurality of deformations are provided that allow the terminal fitting to be folded into a strong and stable foldable terminal fitting. Basically, a tubular barrel section is provided with one or more tongues formed by cutting out generally U-shaped slots in the side wall of the barrel section; A curved portion of the U-shaped slot is formed with a protrusion at its tip. This tongue acts as an integral spring means and extends along the surface of the tubular barrel.
The protrusion engages the spark plug terminal when it is an inward protrusion, and engages the distributor socket when it is an outward protrusion. Such slots and protrusions can be easily and effectively formed by conventional stamping of a sheet metal blank, which is then bent to form the barrel section and swage. part, and the intermediate part can be molded.

The intermediate portion is provided with three deformed portions that are close to each other and deformed inwardly. These deformed parts do not significantly impair the rigidity of the intermediate part when this terminal fitting is used as a straight type terminal fitting, and are strong and stable when bent in the opposite direction since it is used as a bending type terminal fitting. A folded middle portion is formed.

The caulking portion is caulked over only a portion of its length and consists of a generally cylindrical caulked portion that compresses the ignition cord and an uncaulked portion that forms a diverging funnel. Therefore, in order to pull out the ignition cord from the terminal fitting, the uncompressed portion of the ignition cord must first be compressed within the funnel-shaped part before being pulled out from the tightly caulked part. . For this reason, a strong holding force is provided between the ignition cord and the terminal fitting. This seems to be due to the following reasons. That is, firstly, in order to compress the ignition cord and pull it out from the terminal fitting, k must apply a force greater than J to the ignition cord.

Next, the ignition cord is pressed so hard that it sticks together, breaking the bond between the ignition cord jacket and insulator, pulling the insulator and conductive core out of the terminal fitting, and crushing the jacket. This is because there is no way to extract it.

The electrical connection between the ignition cord and the terminal fitting is described in U.S. Pat.
, 284, 322, further improvements can be made by placing a conductive sheet between the outer jacket portion and the folded central core portion.

As described above, the terminal fitting for an ignition cord of the present invention is composed of an integrated member having various novel features in each of its three component parts, and it goes without saying that these features can be applied independently. This terminal fitting can be connected to either male or female ignition cord connection terminals.

Therefore, the terminal fitting for an ignition cord provided by the present invention includes a straight cylindrical barrel portion, a semi-cylindrical groove-shaped intermediate portion integral with the cylindrical barrel portion and extending straight, and the intermediate portion. This cylindrical barrel (11) part forms an integral spring means for locking the terminal fitting to the ignition cord connection terminal, and the integral straight crimping part forms an integral spring means for locking the terminal fitting to the ignition cord connection terminal. The spring means comprises a tongue defined in the cylindrical barrel by a generally U-shaped slot, said tongue being on a surface of the cylindrical barrel, said tongue being connected to an ignition cord connection terminal. It has a tip with cooperating radial projections. An advantage of the present invention is that the force provided by the integral spring means can be easily controlled and maintained since there is no need to control or maintain the force provided by the entire expandable barrel section as in the past. be.

Further, according to another aspect of the present invention, the intermediate portion of the ignition cord terminal fitting has a first. Second. A third deformation part is provided,
Of these, the first and second deformed portions are formed at edges facing each other in the intermediate portion, and the third deformed portion is provided in the main body portion of the intermediate portion between the first deformed portion and the second deformed portion. It is. The advantage of such a feature is that the third deformed portion has an acute-angled apex, and the first and second deformed portions extend straight and have a smoothly curved portion (12
) When the terminal fitting is bent in a direction to form the following, the resulting terminal fitting has strength and stability in the folded state.

A further advantage of the present invention is that there are no protrusions or obstructions around the barrel portion of the ignition cord terminal fitting of the present invention since the integral spring means is substantially flush with the barrel portion. Therefore, a conventional insulating boot for a terminal fitting can be attached very easily to an ignition cord assembly made by attaching a terminal fitting to an ignition cord.

1 to 4 show a preferred embodiment of the ignition cord terminal fitting of the present invention, in which the terminal fitting 30 is electrically and mechanically connected to the ignition cord 32. and is connected to a male connection terminal (this is shown as spark plug 34). The terminal fitting 30 has a straight cylindrical first barrel portion 36 having an open end surface 38 and an end portion 40, and the barrel portion 36 has a first edge portion 44 and a second edge portion 46. It is integrally connected to a straight semi-cylindrical intermediate groove portion 42 consisting of a semi-cylindrical main body portion 48, and this groove-shaped intermediate portion 42 is connected to a straight third caulking portion 5.
It is integrated with 0.

As shown in FIGS. 1 to 4, the ignition cord 32 includes a conductive central core portion 52, a concentric insulating layer 54 surrounding the core portion, and a jacket portion 5 surrounding the insulating layer 54.
Consists of 6. As is commonly used for "peel-and-fold" type end finishing, the insulating layer 54 and jacket portion 56 are peeled off from the end of the core portion 52 to form an exposed portion 58. The exposed portion 58 is folded back and brought into contact with the jacket portion 56 to connect the jacket portion 56 and the ignition cord terminal fitting 30.
It is fixed between.

The third caulking part (which is shown in detail in Figures 5-12 and 13-15) is U-shaped before caulking;
It consists of a base part integral with the semi-cylindrical groove-shaped intermediate part 42, and first and second side parts which can be caulked. Although channel portion 42 is shown as a semi-cylindrical shape, preferably a longitudinal half of a cylinder, it may comprise any portion of a cylinder or may be of any other suitable conventional shape. In particular, this can be done when a foldable terminal fitting is not preferred.

As shown in FIGS. 1 to 4, the crimping portions 50 are crimped in a novel manner. As can be clearly seen in FIG. 1, the caulking portion 50 is caulked over only a portion 62 of its total length 60, and this length 62 is approximately half of the total length 60''. For this reason, the cylindrical caulked portion 64 (and correspondingly compressed portion 66 of the ignition cord) and the uncaulked portion (15) (which forms a funnel-shaped portion 68 that widens at the end) are separated. The ignition cord 32 is formed from this uncrimped portion 68.
The end portion 69 of is protruding. As mentioned above, this method of crimping provides a superior mechanical connection compared to conventional crimping where the crimped portion is tightly crimped along its entire length. According to this crimping method, before the ignition cord 32 is pulled out from the terminal fitting 30, each layer of the ignition cord is pressed while remaining concentrically attached to each other and compressed by the funnel-shaped portion 68, so that the pull-out strength is increased. . In conventional caulking, when a severe tensile force is applied, the bond between each layer of the ignition cord 32 is broken, the core 52 and the insulating layer 54 are pulled out of the caulking area, and the jacket portion remains unsupported. This is thought to be the case.

As shown in FIGS. 1 to 4, the terminal fitting of this embodiment is provided with a deformable portion, so that it can be finished into a nine-fold type terminal fitting if necessary. Of course, if only a straight terminal fitting is required, the deformed portion (16) can be omitted. As shown, the esso portions 44, 46 are formed with a first deformed portion 70 and a second deformed portion 72, which are adjacent to each other and protrude from each other. The third deformation portion 74 is the first deformation portion 7
0 and the second deformation 72 in the body portion 48 and protrudes toward the edge 44.46.

In the prototype of the embodiment of the present invention made of brass, these deformed parts 70.7 are formed when the terminal fitting is bent.
2 is further deformed in the same direction, and the third deformed part 74 is extended so that the third deformed part 74 forms a smooth and rounded part at the top of the obtuse angle formed by the terminal fitting. It was molded with the intention of creating a bent part. This experiment was successful with a brass prototype.

However, in a prototype made of stainless steel, which is a preferred material, when attempting to bend the terminal fitting in the intended direction, an unstable and undesirable bent portion was created that was severely distorted. However, by chance, when the terminal fitting was bent in the opposite direction contrary to the above intention, a terminal fitting with a smooth, stable and firm bent portion was obtained, and the deformed portion 74
The deformed portions 70 and 72 remain almost intact at the apex of the acute angle formed by the terminal fitting, and the deformed portions 70 and 72 are stretched straight and smooth at the apex of the obtuse angle formed by the bent terminal fitting. The curved edge portions 44 and 46 were formed.

Ignition cord terminal fitting 30 shown in Figs. 1 and 2
is connected to the spark plug, the latter having an insulating part 80 and a terminal part 82. The terminal portion 82 has a shape that conforms to the industrial standard used for male terminals for spark plugs for automobiles and combustion furnaces, and also conforms to industrial standards for male terminals for distri- beaters of internal combustion engines equipped with distributors with caps. It has a shape that complies with the standard. As shown, the terminal portion 82 includes an end face 84 , a conical truncated head 86 , a cylindrical portion 88 , and a truncated conical head 90 .
The neck part 92 is in the morning. Although the base 94 can be varied, the overall height from the end face 84 to the shoulder 96 must be precisely controlled. When this embodiment is used in conjunction with a spark plug type terminal, the end face 38 of the terminal fitting 30 will abut snugly against the shoulder 96.

Although in the embodiment of FIGS. 1-4, as well as in all other embodiments of the present invention, the barrel portion 36 is a locking or solid barrel, it is understood that the barrel portion 36 may be a conventional expandable barrel. It may be formed into any shape. However, even in the expanded version, there is no need to control the expansion of the barrel because of the integral spring means in accordance with the present invention.

As shown, the barrel portion 36 is configured as a locking double barrel by a recessed projection 100 and a groove-shaped slot 102 formed on the first and second edges forming a seam 104. Foot joints 100, 102 as necessary
The locking action of can be increased by crimping using conventional techniques to expand the dimensions of projection 100 and contract the opening of slot 102.

As best seen in FIG. 4, the preferred embodiment of the invention provides an integral spring means. The spring means (19) consists of an axial tongue 110 extending parallel to the longitudinal axis 112 of the barrel portion 36, which tongue extends parallel to the curved portion 11.
4 and outwardly flared sides 116° 118;
The base 120 of 10 is wider than the distal end 122. The distal end 122 is provided with a protrusion 124, which in the illustrated embodiment is a circular protrusion projecting radially inward. The protrusion 124 cooperates with the tapered conical truncated head 90 of the terminal portion 82 to establish an electrical connection with the terminal portion 82 and to firmly abut the terminal fitting 30 against the shoulder portion 96.

Needless to say, the terminal fitting 30 is connected to the spark plug terminal portion 82.
The protrusion 124 does not necessarily have to be a circular protrusion in order to abut against the shoulder 96 of the present invention, and the protrusion 124 does not have to be an inward protrusion in order to form the functional terminal fitting of the present invention. The tongue-shaped portion may not extend in the axial direction.

The embodiments of FIGS. 1 to 4 and FIG. 9.

In the embodiment of FIGS. 10, 15, and 16, the tongue 110 extends (20) approximately in the plane of the barrel portion 36, but is stiffened by a transverse arcuate curvature. In addition, the wide base portion 120 forms a rigid and elastic hinge portion of the tongue portion 110, so that the pull-out force of the terminal fitting is extremely strong and the pull-out force can be easily controlled. can.

5 and 6 illustrate a second embodiment 130 of the present invention. This embodiment is similar in many respects to the previous embodiment. In these figures, the caulking portion 50 is approximately U before caulking.
It is shown as a part of the letter shape, and the caulking part is the middle part 4.
2, and first and second sides 134, 136 having edges 138 and 140. base 1
32 and side portions 134, 136 may be provided with protrusions 142 or the like to more securely hold the ignition cord 32, and a plurality of tongue-shaped protrusions protruding inward to bite into the jacket portion of the ignition cord 32. A protrusion can be provided. However, the holding force obtained by the caulking method of the present invention is considered to be sufficient to put the ignition cord terminal fitting of the present invention into practical use.

In the embodiment of FIGS. 5 and 6, the integral spring means of the present invention comprises a first tongue 150 and a second tongue 152;
These tongues 1501152 are oriented in the circumferential direction indicated by arrows 154.

The first tongue 150 extends generally into the plane of the barrel portion 36a and is defined by a U-shaped slot. This slot has a curved portion 156 and a diverging side 1
58 and 160 to form a tongue-like portion 150 having a distal end portion 164 that is slightly wider than the base portion 162. The tip 164 is provided with a radial protrusion 166 . The second tongue portion 152 has a curved portion 170 and two diverging υ side portions 172.
The slot is defined by a generally U-shaped slot having an angle of 174° 9 which defines a tongue 152 having a tip 176 and a substantially wider base 178. A radial protrusion 180 is formed at 176 . When used with female terminals, protrusion 166.1
The protrusions 80 project inwardly to face each other, and these protrusions can project outwardly when used with conventional female terminals. When used in a spark plug terminal, as is the case with the most preferred embodiment shown in FIG. bring it into contact.

7 and 8 illustrate a third embodiment 190 of the present invention. This embodiment is similar to the first embodiment in several respects, but
The difference is in the configuration of the integral spring means.

As shown in FIG. 8, the integral spring means of the third embodiment is a circumferential tongue 192 having a length slightly shorter than half the circumference of the barrel portion 36b. It extends around the barrel portion 36b in the circumferential direction indicated by arrow 194. The tongue 192 is defined by a generally U-shaped slot in the barrel portion 36b, which slot includes a curved portion 196 and side portions 198, 200.
The tongue 19 is entirely formed of a tip 202 and a base 204 of approximately the same width. At the opposite end of the pad (23), the sill portion 36b is provided with a radial projection 208.As in all other embodiments, the projections 206 and 208 are formed integrally by deforming the material of the terminal fitting. By forming a recess on one side of the material, a protrusion is formed on the other side.

Also, like the other embodiments, when this third embodiment 190t is fitted to a female terminal such as a spark plug terminal, the protrusions 206 and 208 may protrude inwardly so as to face each other. Can be used with traditional female distributors
When the terminal fitting 190 is used in combination with a socket, the protrusions 206 and 208 can be projected outwardly and away from each other.

FIGS. 9 and 10 show the ignition cord terminal fitting 3o*f1 of the first embodiment of the present invention bent to form a folding type terminal fitting. For convenience, the caulking portion 50 is shown in a state before caulking and is not connected to the ignition cord 32. As can be seen from FIG. 9, the terminal fitting 30 has a base 132 of the caulked portion 50 at an acute angle 220 with respect to the barrel portion 36.
(24) and the barrel portion 36 forms an obtuse angle 22 with respect to the caulking portion 50.
2 (this corner is shown as edge 138.14 for ease of understanding)
0 and a line 224 parallel to the axis of the base j32 and a line 226 parallel to the longitudinal axis of the barrel portion 36).

As is clear from comparing Figures 1 to 4 with Figures 9 and 10,
In the folded position, the third deformed portion 74 remains relatively unchanged at the top of the acute angle 220, although it may expand slightly due to the bending;
The deformed portions 70, 72 are straightened to form smooth, undistorted fold areas 230, 232 at the top of the obtuse angle 222 formed by the bent terminal fitting.

As can be seen, the sides 134, 136 are connected to the ignition cord 32.
The line 224 and corner 222 do not change even when crimped around the circumference.

11 and 12 show a fourth embodiment of the invention, which is similar in structure to the second embodiment of FIGS. 5 and 6, but with integral spring means. The configuration is different. 4 As can be seen from the drawings, this fourth embodiment 240 of the ignition cord terminal fitting of the present invention has a first tongue portion 242 and a second tongue portion 2.
44, these tongues 242 and 244 are circumferential tongues located on the surface of the barrel portion 36c and formed in the circumferential direction indicated by arrow 246. A first tongue 242 is formed on the barrel portion 36c and has a curved portion 248 and a side portion 250.2.
52 is defined by a generally U-shaped slot. As shown, the sides 250, 252 are generally parallel with a tip 254 and a base 256 of approximately the same width.
A tongue 242 is defined.

The tip portion 254 is provided with a radial protrusion 258, which is a radial protrusion extending longitudinally in the direction of the axis of the barrel portion 36e (which is the same as the axis 112 in FIG. 3). be. As best seen in FIG. 12, the second tongue 244 is defined by a generally U-shaped slot in the barrel portion 36c, which slot has a curved portion 260 and sides 262, 264. A tongue 244 is formed with a tip 266 and a base 268 of approximately the same width. The tip 266 is now formed with a straight radial protrusion 270 that extends in the direction of the axis of the barrel of the terminal fitting of the present invention (e.g., axis 112 in FIG. 3). It is extending. As in all other embodiments of the invention, these radial projections 258, 27
0 can be an inward protrusion when this ignition cord terminal fitting is used by connecting it to a spark plug type terminal (for example, terminal portion 82 in Fig. 11), and can be an inwardly directed protrusion instead of a conventional cup-shaped female distributor terminal. When used in combination, the protrusions may be protruded outwardly so as to separate from each other.

Figures 13 and 14 schematically illustrate the procedure used to form a caulk with improved cord retention properties of the present invention. Code 32 is crimped,
The front side has the side shape and position shown by the solid line 280.282, and after the caulking process, the virtual 1i284
, 286 (27) position and side shape. As is clear from the drawings, the peeled exposed end 58 of the core portion 52 is folded back to abut against the jacket portion 56, and this end of the cord 32 is inserted into the crimped portion 50 of the terminal fitting of the present invention. and the end portion is located in the channel portion 4 before the side portions 134,136.
It is slightly protruding within 2. However, this protrusion is not necessarily necessary in order to implement the present invention or to achieve the effects of the present invention. Since the folded end 58 is positioned to abut the base 132 of the crimping section 50, this end will not be damaged when the sides 134, 136 are crimped around the cord 32. The base 132 is mounted on a support die 290 having a surface 292 that generally conforms to the outer surface of the base 132. A caulking die 294 is provided. The length 296 of this crimping die is approximately equal to the length of the cylindrical crimping portion 64 (indicated by length 62 in FIG.
The length 298 of the support die is approximately A, and the length 298 of the supporting die is approximately equal to the total length 60 of the caulking portion 50 (see FIG. 28). However, the caulking die 29
4 can be offset from the support die 290 and given an appropriate shape, similar results can be obtained. This die 294 is mounted so that it can reciprocate in the direction shown by arrow 300. Die 294 is a conventional overlapping staking die and has a tapered entrance surface 302,304. As can be seen, when the die 294 is moved toward the die 290, the tapered surfaces 302, 304 are aligned with the sides 134.
．． 136i try to bend in the direction toward each other. However, when sides 134 and 136 reach points 306 and 308, they begin to curve inwardly, each with a different radius of curvature. Curved surface 310 preferably has the same radius of curvature as curved surface 312, and the positioning point of curved surface 310 is also higher with respect to surface 313 than curved surface 312. The curved portion 312 has a groove 3]4 and a protrusion 316 as in the conventional case.
is the provision. When die 294 moves toward die 290, error 138 moves along surface 310, while edge 140 moves along surface 312 and groove 31.
4 and is deflected by protrusion 316 toward cord 32 so that edge 140 folds under error 138 so that portion 134 overlaps portion 136.

In this way, a holding portion having a substantially cylindrical caulked portion that is caulked around the cord 320 and compresses the cord, and an uncaulked portion forming a funnel-shaped portion that widens toward the end are formed. This unswaged portion leaves the end extending beyond the funnel toward the channel 42 uncompressed. As described above, this configuration greatly improves the amount of pulling force required to pull out the cord 32 from the caulked portion 50 of the ignition cord terminal fitting of the present invention.

Another embodiment is shown in FIGS. 15 and 16.

This embodiment is similar to the first embodiment of FIGS. 1-4 and includes a circular radial projection 318'i, which projection 320 is identical to projection 124 except in one respect. That is, whereas in the embodiment of FIGS. 1-4, the protrusion 124 projects inwardly to engage the tapered conical truncated head 90 of a conventional spark plug-type terminal. Protrusion 32
0 projects outwardly to engage a conventional cylindrical, cup-shaped distributor female terminal (not shown).

This configuration is obtained by making minor changes to the embodiment shown in FIGS. 1 to 4, and is a novel design that can be easily and inexpensively manufactured so that it can be used for both male and female terminal applications. The present invention provides an ignition cord terminal fitting. This configuration also provides an ignition cord terminal fitting for connecting the ignition cord to a conventional distribeater that contacts the conventional insulation boot when the insulation boot is installed after the ignition cord assembly is assembled. It has no surface failure parts that could damage it and shorten its lifespan.

Figures 17 and 18 show a fifth embodiment of the ignition cord terminal fitting of the present invention, which has many features in common with the previously described embodiments. , the caulking portion 50a has a first side portion (31) 322, a second side portion 324, and a base portion 326.

Preferably, side portions 322 are longer than side portions 324 to provide a non-overlapping swage.

In the portions 322, 324, 326 there are grooves 32 forming protrusions.
8.330 is set.

Barrel portion 36d is also provided with integral spring means, the latter being provided with a first spring means disposed circumferentially in the direction of arrow 336.
It has a tongue portion 332 and a second tongue portion 334 . The first tongue 332 is defined by a generally U-shaped slot in the barrel portion 36d, which slot includes a curved portion 338 and side portions 340, 342;
and a base 346 . The tip 344 is provided with a radial protrusion 348 that extends straight in a direction parallel to the axis 112 in FIG.

The second tongue portion 334 has a curved portion 352 and a side portion 354°356.
defined by a generally U-shaped slot consisting of;
This slot has a second slot having a distal end 358 and a base 360.
A tongue-like portion 334 is formed.

The distal end portion 358 has a (32
) radial projections 362 similar to straight projections 348;
is the provision.

Further, the barrel portion 36d is provided with a radial protrusion (shown as a ridge or groove 364) that extends straight in the circumferential direction from near the protrusion 348 to near the protrusion 362. A first gap 366 is formed between the protrusion 348 and the protrusion 364.
A second gap 368 is formed between the two. Of course, the projections 364 may be either inward or outward projections and act as circumferential stiffeners to increase the spring constant of the tongues 332,334.

Figures 19 and 20 illustrate a preferred method for crimping the crimping portion 50a around the ignition cord (eg, 32). The position of the ignition cord before caulking is shown by solid lines 370 and 372. The outline of the ignition cord after caulking is imaginary line 37
It is indicated by 4.376. As shown, the ignition cord is disposed between sides 322 and 324 such that its free end 378 extends a pinion distance beyond swage portion 50a'i toward barrel portion 36d. Caulking part 50
a is placed on the support die 380, and its base 328
is in contact with the surface 382 of the support die 380. The crimping die 384 is reciprocatable in the direction of arrow 386 and includes tapered entrance surfaces 388 and 390 and a curved surface 392 communicating therewith. As can be seen, the surfaces 388, 390, 392 guide the tip 394 of the first side 322 and the tip 396 of the second side 324 when driven toward the crimping die 384t and the support die 380. They are brought into contact with each other to form a non-opera, crimped part. As is clear, when a force is applied to the ignition cord (e.g., cord 32), the free end 378 is compressed to a certain degree, so that if the caulking method of FIGS. 19 and 20 is performed, the result as shown in FIGS. A similar funnel effect occurs to provide at least some of the benefits of the funnel swage in holding the layers of the ignition cord in bonded relationship with each other.

21 to 31 illustrate various other variations of the present invention and illustrate the construction of integral spring means that can be formed in the barrel portion 36. These spring structures can be used in a variety of applications comprising the ignition cord terminal fittings of the present invention. Figures 21 to 31 show the integral spring portion of the barrel section unfolded. The terminal fitting of the present invention is formed by a conventional multi-stage stamping process, and initially has a stamped flat shape and is connected to each other by connecting rails, but later it is formed into a suitable shape. The barrel portion, intermediate portion, and caulking portion are formed by curving. The embodiment of FIGS. 21 to 31 is somewhat similar to the corresponding parts of the second embodiment shown in FIGS.
20' (i- defined generally U-shaped slot, which has a curved portion 422 and diverging sides 424, 426)
and a second U-shaped slot (
It comprises a curved section 442 and side sections 444, 446). In the embodiment of FIGS. 2□1 to 23, the radial projections 438° 440 are provided by the tongues 4'20, 430.
They differ from each other in the means (35) for adjusting the spring tension acting on them. In the example of FIG. 21, a circumferential slot 442 is provided to cut away material at the base of the tongues 420 and 430 to reduce the elasticity of the tongues. Second
In the example shown in Figure 2, a pair of small holes 444 are provided to cut the material from the base of the tongue to reduce the elasticity of the tongue.
In the example of FIG. 3, one large diameter hole 446 serves the same purpose for both tongues 420 and 430 at the same time.

The embodiment of FIG. 25 is a further modification of the embodiment of FIG. 21, in that each tongue defined by the flared U-shaped slot is provided with an additional U-shaped slot;
The spring force is made relatively small. The first tongue 420 is formed with a generally U-shaped first tension control slot, which includes a curved portion 450 and flared sides 452, 454, and It is approximately parallel to 424°426. Therefore, the tongue 4
Material is removed from the resilient hinge portion of 20 between sides 452 and 454, effectively reducing its resiliency. The tongue 430 is likewise provided with a generally U-shaped slot for the same purpose, consisting of a curved portion (36) 460 and flared side portions 462,464.

The embodiment of FIGS. 24-27 can be considered as a modification of the embodiment of FIGS. 5 and 6, in that the generally U-shaped slots defining each tongue differ in shape, and the tongues To control or reduce the elasticity of

with or without hole means. In FIG. 24, the curved portion 4
72 and a U-shaped slot with sides 474, 476 parallel to each other. A tongue 470 is defined.

The second tongue portion 478 is connected to the curved portion 480 and the side portions 4 parallel to each other.
Defined by a U-shaped slot with 82.484.

In FIG. 26, the first and second tongues 500, 502 are formed by two plane-symmetrical slots, each slot having a curved portion 504, a diverging side portion 506, 508, and a parallel portion 510. , 512.

In FIG. 27, the first and second tongues 514, 516 are defined by substantially U-shaped slots that are symmetrical to each other;
Each slot includes a curved portion 518 and a circumferentially extending first
It consists of a side part 520 and a second side part 522 extending from the corresponding side part 520.

The embodiment of FIG. 28 is similar to that of FIG. 24, but includes a spring tension adjustment slot. That is, a single circumferentially extending slot 524 extends into tongues 470 and 478 to reduce the material at the base of tongues 470 and 478 to reduce their elasticity and spring constant. and restricted. The width of this slot and all other embodiments, as well as the diameter of the holes provided for this function, can be increased or decreased as appropriate to control the elasticity and spring tension of the tongue.

FIG. 29 shows a modification of the embodiment of FIG. 1 in which two small axial tongues are used instead of one large axial tongue. 1st. The second tongue 526.528 has curved portions 530, 532 and side portions 534.536.538.54.
0 and 534, 536, 5, respectively.
38° 540 extends generally parallel to the long sleeve, such as axis 112 in FIG.

FIGS. 30 and 31 are further modifications of the second embodiment shown in FIGS. 5 and 6 and the modification described above. In the embodiment of FIG. 30, first and second tongues 542
, 544 is defined by a slot, each of which has two legs parallel to each other, one leg communicating with the opposite leg, extending in a plane-symmetrical circumferential direction. It is in the form of two U-shaped slots. That is, the slot consists of curved portions 546, 548, non-communicating legs 550, 552, and one leg 554 connecting said curved portions 546 and 548 to each other. The embodiment of FIG. 31 is a modification of the embodiment of FIG. 30 to provide greater spring tension than that of FIG.

The curved portions 546 and 5z8 are connected by a single leg 556, but the diverging legs 558, 560 are not connected to each other and define a base 5.6.2, 564f. The width of these bases is equal to that of the tongue 5 of the embodiment of FIG.
The width of the corresponding part of 42,544 is much larger.

(39) From the above, it is clear that the ignition cord terminal fitting of the present invention can be used as either a straight type or a bent type, and can be used with either a male type or a female type connector. Advantages include improved resistance to pull-out forces, ease of installation without damaging the insulating boot, and controllable spring force of the integral spring means. It goes without saying that various modifications and changes can be made to the present invention without departing from the spirit of the invention.

[Brief explanation of the drawing]

Fig. 1 is a side view of an ignition cord with a terminal fitting according to the first embodiment of the present invention connected to a spark plug terminal, Fig. 2 is a sectional view of Fig. 1, and Fig. 3 is an implementation of Fig. 1. FIG. 4 is a perspective view of the embodiment shown in FIG. 1 seen from below, FIG. 5 is a perspective view of the terminal fitting according to the second embodiment of the present invention, and FIG. 5 is another perspective view of the embodiment of FIG. 5 (40), showing a posture opposite to that of FIG. 5; FIG. 7 is a perspective view of a terminal fitting according to a third embodiment of the present invention; FIG. 8 is another perspective view of the embodiment shown in FIG. 7, showing the position reversed from that shown in FIG. 7, and FIGS. 9 and 10 show the embodiment shown in FIG. FIG. 11 and FIG. 12 are perspective views of a terminal fitting according to the fourth embodiment of the present invention, and FIG. 13 is a new perspective view showing a terminal fitting formed by bending the terminal fitting to an ignition cord. FIG. 14 is a cross-sectional view taken along arrows 14-14 in FIG. 16 is a cross-sectional view taken along arrow 16-16 in FIG. 15, and FIG. 17 is a perspective view of a terminal fitting according to a fifth embodiment of the present invention. 18 is another perspective view of the embodiment of FIG. 17, showing the terminal fitting reversed from the position of FIG. 17, and FIG. 19 is a second perspective view of the embodiment shown in FIG. FIG. 20 is a sectional view taken along arrow 20-20 in FIG. This is a developed diagram. 30.130,190,240... Ignition cord terminal fitting, 32... Ignition cord, 34... Spark plug,
36... Barrel part, 38... Open first end of barrel part, 40... Second end of barrel part, 42... Intermediate part, 44... First edge of intermediate part, 46... Second edge, 48... Intermediate main body portion, 50... Caulked portion, 132° 326... Base of caulked portion, 134, 32
2... First side part of the crimped part, 136, 324... Second side part of the crimped part, 64... Tubular crimped part of the crimped part, 66... Compression cord part, 68... crimped funnel-shaped part of the part, 69... cord end part, 70... first deformed part,
72...Second deformation part, 74...Third deformation part, 110
,150,152゜192.242,244,332,
334,420°430.470,478,500,5
02,514°516.526,528,532,53
4...Integrated spring means (tongue), 114, 156.
17,0°196.248,260,338,352・
・・U-shaped slot curved part, 116, 118, 158,
160°172.174,198,200,250,2
52゜262.264.340.342.354,35
6... U-shaped slot side part, 120, 160, 178
゜204.256.268.346.360...Base of tongue, 122,164,176.202,254゜266.344,358...Tip of tongue, 124
. 166.180.206.258.270,348°3
62... Protrusion, 364... Circumferential protrusion or groove for reinforcement, 442.444.446.524... Notch or slot for controlling spring tension. Margin below, 111 - 2nd IG 26 --±゛IG, ″31

Claims (1)

[Claims] 1. A straightly extending first cylindrical barrel portion having a first open end and a second end; and a straightly extending second intermediate portion integral with the second end. comprising first and second edge portions and a body portion, the body portion having a first end integral with the cylindrical barrel portion and a third straightly extending crimped portion. an integral second end portion; and the caulking portion includes a base portion integral with the main body portion, and first and second side portions integral with the base portion. the first and second side portions are adapted to be swaged around an ignition cord having a folded core portion; and the first cylindrical barrel portion has a terminal. an integral spring means for locking the fitting to the ignition cord connection terminal, the integral spring means comprising a tongue-like portion, and the cylindrical barrel portion forming a generally U-shaped slot; a slot defining the tongue, the tongue being disposed substantially in a face of the cylindrical barrel portion, the tongue having a distal end; 1. A terminal fitting for an ignition cord, characterized in that a distal end portion is formed with a radial protrusion that cooperates with the ignition cord connecting terminal to lock the ignition cord terminal fitting to the connecting terminal. 2. The terminal fitting for an ignition cord according to claim 1, wherein the intermediate section has a first section that allows the intermediate section to be bent in a first direction. second and third deformed parts, the first deformed part is formed in the first edge part in the direction of the second edge part, and the second deformed part is formed in the first deformed part. A second edge portion is formed in the direction of the first deformation portion so as to face the portion, and the third deformation portion is formed between the first deformation portion and the second deformation portion and forming the second edge portion of the first and second edge portions. the first direction is a bending direction such that the base of the caulking portion forms an acute angle with respect to the barrel portion and the side portion of the caulking portion forms an obtuse angle with respect to the barrel portion; A terminal fitting for an ignition cord characterized by: 3. The barrel part is a locking second barrel part, and the barrel part has a seam formed by the first and second edges of the barrel part, and the first and second edges have mutually fitting holes. The terminal fitting for an ignition cord according to claim 1, characterized in that a groove is provided. 4. the tongue is an axial tongue extending in the direction of the longitudinal axis of the barrel, and the generally U-shaped slot has a curved portion defining the tip and substantially extending from the tip; 5. An ignition cord terminal fitting according to claim 1, characterized in that the ignition cord terminal has a side portion of the flared tongue defining a wide tongue base. a first tongue and a second tongue; each of the first and second tongues being a circumferentially extending tongue; and each of the tongues being an igniter. The ignition cord according to claim 1, characterized in that the ignition cord has a tip end portion each having a radial protrusion that cooperates with the cord connection terminal to lock the ignition cord terminal fitting to the connection terminal. 6. The terminal fitting for an ignition cord according to claim 5, wherein the barrel portion has a third radial projection;
The third radial protrusion is a circumferential protrusion that extends straight in the circumferential direction from the vicinity of the radial protrusion of the first tongue to the vicinity of the radial protrusion of the second tongue. The portion defines a first gap between the first end of the circumferential projection and the radial projection of the first tongue, and the barrel portion defines a first gap between the first end of the circumferential projection and the radial projection of the first tongue. A terminal fitting for an ignition cord, characterized in that a second gap is formed between the radial projection of the second tongue-shaped portion and the radial projection of the second tongue-shaped portion. 7. Each of the tongues is defined by a generally U-shaped slot formed by a barrel portion, and each of the generally U-shaped slots has a curved portion and a diverging side portion. A terminal fitting for an ignition cord according to claim 5. 8. Each of the generally U-shaped slots formed by the barrel portion has a curved portion and first and second sides, the first side of one generally U-shaped slot forming a substantially U-shaped slot of the other generally U-shaped slot; The terminal fitting for an ignition cord according to claim 5 or 7, characterized in that the terminal fitting is integral with the first side portion of the letter-shaped slot. 9. The terminal fitting for an ignition cord according to claim 1, wherein the tongue portion is a circumferential tongue defined by a substantially U-shaped slot oriented in the circumferential direction formed in the barrel portion. the nuclear circumferential tongue has the radial protrusion at its distal end, and the cylindrical barrel portion is diametrically opposed to the first radial protrusion; further comprising a second radial protrusion disposed such that the first and second radial protrusions cooperate with the ignition cord connection terminal to lock the ignition cord terminal fitting to the connection terminal. 10. The ignition cord terminal fitting according to claim 2, wherein the ignition cord terminal fitting is folded in the first direction. The third deformed portion is located at the top of the acute angle formed by the foldable terminal fitting, and the first and second deformed portions are bent. The part is stretched straight,
This terminal fitting for an ignition cord is characterized in that a smooth, distortion-free bending area is formed at the top of the obtuse angle formed by the folding terminal fitting.