JP3565536B2 - Fuse holder - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a compact and highly waterproof fuse holder in which a tube fuse for protecting an electronic device and an electric wire of an automobile from overcurrent is provided.
[0002]
[Prior art]
FIG. 11 shows a conventional fuse holder described in Japanese Utility Model Laid-Open No. 60-181845.
The fuse holder 85 has one terminal 90 that contacts one end of the tube fuse 88 in the insulating tube 86 and the cap 87 under the bias of the spring 89, and the other end of the tube fuse 88. And a second terminal 92 which is in contact with the annular portion 91 and protrudes to the outside.
[0003]
However, in the fuse holder 85, there is a concern that water may intrude from the lead holes 93 and 94 of the terminals 90 and 92, or that current may leak outside due to the terminals 90 and 92 being exposed to the outside. was there. Further, when the terminal 90 is pulled, a gap is generated between the fuse 88 and the terminal 90, and there is a concern that an electric circuit is cut off. If the terminal 90 is fixed in order to prevent this, the spring 89 does not act, and an appropriate contact pressure between the fuse 88 and the terminal 90 cannot be obtained.
[0004]
FIG. 12 shows a conventional fuse holder described in Japanese Utility Model Laid-Open Publication No. 54-180247.
The fuse holder 95 has a pair of split cases 97 and 98 that can be opened and closed by a hinge 96, a pair of fixed portions in the case 97, and a contact portion 100 that contacts each end of the tube fuse 99 and a wire connection portion 101. It is composed of terminals 102 and 102.
[0005]
However, in this fuse holder 95, since the tube fuse 99 and the terminals 102, 102 on both sides are connected in series, the total length is long, and there is a concern that a space problem may occur. This problem becomes more remarkable by providing a waterproof structure in the holder 95.
[0006]
FIG. 13 shows a conventional fuse holder described in Japanese Utility Model Laid-Open No. 62-12253.
This fuse holder 103 is orthogonal to both ends of a holder main body 104, a cover 105 that can be opened and closed, a waterproof packing 106 disposed between the holder main body 104 and the cover 105, and a pipe fuse 107 in the cover 105. And a terminal 109 to which each lead wire 108 is connected.
[0007]
However, in the fuse holder 103, since the tube fuse 107 and the terminal 109 are connected in the orthogonal direction, there is a concern that the fuse holder 103 is enlarged in the thickness direction and requires a large space.
[0008]
FIG. 14 shows a conventional fuse holder described in JP-A-8-83560.
The fuse holder 110 includes a pair of terminals 116 having a cylindrical holder body 111 and a cap 112, a contact portion 114 connected to both ends of a tube fuse 113 in the holder body 111, and a wire connection portion 115, and a terminal 116. And a spring 117 biasing in the fuse direction.
[0009]
However, in the fuse holder 110, when a tensile force greater than the urging force of the spring 117 acts on the electric wire 118, a gap is formed between the terminal 116 and the fuse 113, and the electric circuit is temporarily interrupted. There was a concern. Further, in manufacturing, after inserting the electric wire 118 into the holder main body 111, it is necessary to insert the spring 117 and then crimp the terminal 116 to the electric wire 118, which is troublesome, cannot be automated, and costs are high. It becomes. In addition, the work becomes more difficult for waterproofing.
[0010]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and has as its object to provide a fuse holder that is small, has excellent waterproof properties, secures electrical connection, and can be manufactured automatically.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a fuse holder including a substantially cylindrical holder main body having an opening on one side, and a cover for closing the opening. There is formed eccentrically, a second insertion hole for the first insertion hole and a second terminal for the first terminal is formed in parallel with the tube fuse insertion hole from the bottom side of the holder body, the tube fuses insertion hole and the first and second respective insertion holes of close as located at the apex of the triangle, and close to one end of the first insertion holes said tube fuse insertion hole, said the second insertion hole located to the other end side of the said tube fuse insertion hole, said tube contact spring portions of the first contacts are inserted into the fuse insertion hole, the contact portion is the first folded back with said first contact A second contact is mounted on the cover. Said second contactor, and having a contact spring portion for the tube fuses tube fuse insertion hole, and a contact portion which enters into the second insertion hole.
The first contactor includes a bottom plate portion, the contact spring portion that is bent and raised from one end of the bottom plate portion, and a connection plate that is raised from the other end of the bottom plate portion, And the contact portion folded back from the tip of the connecting plate.
An annular wall is formed in the cover, a notch is provided in the annular wall, a contact spring portion of the second contactor is inserted inside the annular wall, and the contact spring portion of the contact spring is removed from the notch. The intermediate extension projects outward and the intermediate extension abuts against the end face of the notch to prevent excessive flexing of the contact spring.
A waterproof packing for the holder body is fitted to the outside of the annular wall, and a waterproof rubber plug integrated with a terminal is fitted to the first and second insertion holes.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific examples of the embodiments of the present invention will be described in detail with reference to the drawings.
1 to 5 show an embodiment of a fuse holder according to the present invention.
[0013]
The fuse holder 1 includes a synthetic resin cylindrical bottomed holder body 2, a synthetic resin cylindrical cover 4 attached to the opening 3 (FIG. 4) side of the holder body 2, and an opening 3 side. First contact (relay terminal) 5 and tube fuse 6 inserted into holder body 2, second contact (relay terminal) 7 inserted into cover 4, bottom of holder body 2 The first terminal 9 is inserted from the side of the holder 8 toward the opening 3 and connected to the first contact 5, and the second terminal 7 is inserted from the middle portion in the longitudinal direction of the holder body 2 toward the opening 3. , And a waterproof packing 11 attached to the back side of the cover 4.
[0014]
The holder body 2 has a lock arm 12 for fixing, a lock protrusion 13 for locking to the cover 4, a guide rib 14 and a guide protrusion 15 on the outer peripheral side. As shown in FIG. 6, a space 16 is formed on the side of the opening 3 of the holder main body 2, and a tube fuse insertion hole 17 is formed in the holder longitudinal direction so as to communicate with the space 16. One of the fuse insertion holes 17 is open (18), and the other is closed by the bottom wall 8 of the holder body 2. At the bottom of the fuse insertion hole 17, ribs 19 (FIGS. 6 and 7) for holding the terminals are formed so as to project in three directions. The fuse insertion hole 17 is located eccentrically from the center of the holder body 2 and closer to the outer peripheral wall 20.
[0015]
From the bottom wall 8 of the holder body 2, a first insertion hole 21 (FIG. 6) for the first terminal 9 is formed in parallel with the fuse insertion hole 17. One of the insertion holes 21 is opened (22) in the bottom wall 8, and the other is in communication with the fuse insertion hole 17 and the space 16. The insertion hole 21 has a large-diameter rubber plug insertion portion 23 and a small-diameter terminal accommodating chamber 24. The insertion hole 21 is eccentric from the center of the holder main body 2 in a direction opposite to the fuse insertion hole 17, and is located adjacent to the fuse insertion hole 17 near the outer peripheral wall 20.
[0016]
The contact spring portion 25 of the first contact 5 is located at the bottom of the fuse insertion hole 17, and the male tab portion (male contact portion) of the contact 5 is provided in the terminal accommodating chamber 24 of the first insertion hole 21. 26 are located. The contact 5 has a contact spring portion 25 which is bent in a meandering manner from one of the bottom plate portions 27 (FIG. 8) and rises straight from the other of the bottom plate portion 27 and rises higher than the contact spring portion 25 to form a step in the middle. The connecting plate 29 includes a connecting plate 29 that extends straight through the portion 28 and a male tab portion 26 that is folded in the opposite direction from the tip of the connecting plate 29.
[0017]
On both sides of the bottom plate portion 27, a pair of cutout grooves 30 for fitting to the ribs 19 in the fuse insertion holes 17 are formed. The spring portion 25 has three bent portions 31, and a contact projection 33 for one terminal portion 32 of the tube fuse 6 (FIG. 1) is formed on the tip side of the spring portion 25.
[0018]
The spring portion 25 elastically contacts the terminal portion 32 of the tube fuse 6. The cutout groove 30 of the bottom plate portion 27 is fitted into the rib 19 with a slight press fit, whereby the contact 5 is firmly fixed. The connecting plate 29 is located along the stepped inner wall 34 of the fuse insertion hole 17, the male tab portion 26 is positioned higher than the spring portion 25 and enters the terminal accommodating chamber 24, and the first terminal 9 (FIG. Connected to 1). The contact protrusion 35 of the male tab 26 contacts the contact spring piece in the box-shaped contact 36 of the terminal 9.
[0019]
A waterproof rubber plug 38 and an input or output electric wire 39 are fixed to the electric wire crimping portion 37 of the terminal 9 (FIG. 1) in advance by co-tightening. A flexible locking lance 40 for the terminal 9 is formed in the terminal accommodating chamber 24 (FIG. 6).
[0020]
In FIG. 6, a spacer 42 made of synthetic resin is inserted into the empty space 41 following the terminal accommodating chamber 24 from the opening 3 side, thereby fixing the male tab 26 side of the contact 5. The spacer 42 includes a plate portion 43 that contacts the connection plate 29 of the contact 5, a protrusion 44 formed on the plate portion 43 and abutting on the upper end of the male tab portion 26, and locking protrusions 45 and 46 for the holder body 2. have.
[0021]
As shown in FIGS. 2 to 4, a second insertion hole 47 for mounting the second terminal 10 is eccentrically provided near the outer peripheral wall 20 in the holder main body 2. The fuse insertion hole 17, the first insertion hole 21, and the second insertion hole 47 are arranged so as to be located at each vertex of the triangle as shown in FIG. By arranging the three insertion holes 17, 21, 47 in a triangular shape, the holder main body 2 is made compact in the radial direction.
[0022]
As shown in FIGS. 4 and 5, the second insertion hole 47 has an opening (entrance portion) 48 at an intermediate portion in the longitudinal direction of the holder main body 2, and extends in parallel with the first insertion hole 21. The holder body 2 is notched (49) up to the opening 48 of the second insertion hole 47. The first insertion hole 21 is located near one end of the holder main body 2 (near the integral part), and the second insertion hole 47 is located near the other end of the holder main body 2 (near the other end). Is located near one end of the tube fuse 6 (near the integral part), and the second terminal 10 is located near the other end of the tube fuse 6 (near the other end). Is planned. The second insertion hole 47 has a waterproof rubber plug insertion portion 50 having the same shape as that of the first insertion hole 21 and a terminal accommodating chamber 51. The terminal accommodating chamber 51 communicates with the empty chamber 16, and the second contactor. 7 has an insertion port 53 for the male tab portion 52.
[0023]
The second terminal 10 (FIG. 4) inserted into the second insertion hole 47 has the same shape as the first terminal 9, and the waterproof rubber plug 54 having the same shape is used for an output or input electric wire 55. Has been tightened with. The terminal 10 is locked in the terminal receiving chamber 51 by a flexible locking lance 56. The male tab 52 of the second contact 7 and the contact 57 of the second terminal 10 are connected by inserting the terminal 10 or attaching the cover 4.
[0024]
The second contact 7 is fixed to the cover 4. The cover 4 has a pair of flexible lock pieces 59 on the outer peripheral wall 58 side as shown in FIGS. The lock piece 59 has a long hole 60, and the lock protrusion 13 (FIG. 5) of the holder main body 2 is engaged with the long hole 60.
[0025]
An annular wall 62 is suspended from the central portion of the top wall 61 of the cover 4, the second contact 7 is fitted and fixed inside the annular wall 62, and a ring-shaped packing 11 is provided outside the annular wall 62. It is fitted. The packing 11 is fixed by fitting a plurality of locking projections 63 into holes 64 of the top wall 61. A mountain-shaped lip 65 is formed on the outer periphery of the packing 11, and by attaching the cover 4 to the holder body 2, the inner peripheral wall 66 (FIG. 1) of the holder body 2 comes into close contact with the lip 65, and Intrusion of water and the like is prevented. In FIG. 1, the tube fuse 6 is held so as to be displaceable between the rib 19 and the annular wall 62, and the displacement is regulated by abutting on the rib 19 and the annular wall 62.
[0026]
The second contactor 7 has a bottom plate 68 having notched grooves 67 on the left and right as shown in FIGS. 9 and 10, a contact spring portion 69 raised in a meandering manner from one of the bottom plates 68, and the other of the bottom plate 68. And a male tab portion (male contact portion) 52 that is straightly raised from the front. The spring portion 69 has three bent portions 70, and the uppermost bent portion 70 side largely protrudes in the lateral direction to form an intermediate extension portion 71, and a contact protrusion 72 is formed on the tip side of the spring portion 69. . The male tab portion 52 protrudes higher than the spring portion 69, and has a contact protrusion 73 on the distal end side.
[0027]
A plurality of ribs 74 are formed inside the annular wall 62 of the cover 4 in the height direction, and a slit 75 in the height direction is formed in the annular wall 62. The notch groove 67 of the bottom plate 68 of the second contact 7 is fitted into the rib 74, the base side of the male tab 52 of the contact 7 is fitted into the slit 75, and the contact 7 is firmly fixed. . The spring portion 69 protrudes higher than the annular wall 62 in the free state of FIG.
[0028]
A notch 76 is formed in a part of the annular wall 62, and a part (intermediate extension) 71 of the spring part 69 protrudes outward from the notch 76, and a gap between the spring part 69 and the lower end surface 77 of the notch 76 is formed. A small gap S is formed, the spring portion 69 is displaced in the range of the gap S, and the displacement of the spring portion 69 is regulated by the abutment of the intermediate extension portion 71 on the lower end surface 77. A reliable contact pressure with the terminal portion 79 of FIG. 1 is ensured. Since the intermediate extension portion 71 is supported by the lower end face 77, a stronger contact pressure is exerted than the entire spring portion 69 is bent.
[0029]
The intermediate extension 71 is located immediately above the packing 11 and also prevents the packing 11 from coming off. That is, when the packing 11 tries to come out of the annular wall 62, the end face 78 of the packing 11 comes into contact with the intermediate extension portion 71, and the packing 11 is held without coming off.
[0030]
According to this embodiment, the terminals 9 and 10 are inserted into the holder main body 2 from the same direction to be located near each end of the tube fuse 6, and the male tab 26 of the first contact 5 is folded back. To the first terminal 9, the first terminal 9 and the first contact 5 are positioned in parallel, and the male tab 52 of the second contact 7 covers the second terminal 10. Extending in the fitting direction, whereby the tube fuse 6 and the terminals 9, 10 are arranged in parallel, and the male tab portions 26, 52 of the contacts 5, 7 are arranged in parallel with the tube fuse 6. The fuse holder 1 is made compact in the length direction. Further, since the tube fuse 6 and the two terminals 9 and 10 are arranged at the vertices of the triangle, the fuse holder 1 is compact in the radial direction.
[0031]
Further, since the second terminal 10 is inserted from the middle of the holder main body 2, the second contact 7 can be shortened, and the contact 7 can be downsized. The length of the first contact 5 is also reduced by the folded structure, so that the first contact 5 is downsized, space saving and cost reduction are achieved, and the downsizing reduces deformation due to external force during manufacturing. In addition, the creeping distance of the contacts 5 and 7 is increased due to, for example, a structure in which the contact 5 is folded in the middle or a structure in which the spring portion 69 and the male tab 52 protrude in the same direction. Thereby, when a voltage difference is generated between the input side and the output side when the tube fuse 6 is blown, the creeping distance of the electrical conduction portion between the input side and the output side becomes longer, and the fuse holder 1 is connected to the high voltage circuit. Applicable. Further, since the terminals 9 and 10 and the contacts 5 and 7 are not exposed from the holder main body 2 and the cover 4, current leakage is prevented.
[0032]
Further, since the packing 11 is rounded and miniaturized according to the shape of the holder main body 2 and the packing 11 and the rubber stoppers 38 and 54 are both disposed at locations where they do not slide, the sealing properties are good and the structure is good. Simple and low cost. Further, since the terminals 9, 10 and the electric wires 39, 55 and the rubber plugs 38, 54 are assembled in a separate operation in advance and have no through-work parts, the assembly of the fuse holder 1 can be automated and the manufacturing cost can be reduced. Is done. Further, since the terminals 9 and 10 and the rubber stoppers 38 and 54 can be shared for both the input side and the output side, the cost can be reduced. Further, even if a tensile force acts on the electric wires 39 and 55, the terminals 9 and 10 are securely locked, and the contact between the contacts 5 and 7 and the fuse 6 is not disturbed at all. An electrical connection is obtained.
[0033]
Further, since the spring portions 25 and 69 of the contacts 5 and 7 have a bent structure, the contact with the fuse 6 is stabilized, and even if the spring portions 25 and 69 are displaced or deformed due to, for example, vibration. The contact between the fuse 6 and the terminals 9 and 10 is always stable by the resilient force of the spring portions 25 and 69. For example, even if an abnormal external force is applied and the spring portion 69 is bent, the spring portion 69 abuts on the annular wall 62 and further bending is prevented, so that deformation and poor contact of the spring portion 69 are prevented. Further, since the spring portion 69 helps prevent the packing 11 from coming off, the locking projection 63 of the packing 11 can be eliminated to reduce the number of assembling steps, thereby reducing costs. Even if breakage occurs, the packing 11 is held in the cover 4.
[0034]
【The invention's effect】
Since the present invention is configured as described above, according to claim 1, the tube fuse and each input / output terminal are radially close to each other, and both terminals are longer in the longitudinal direction than the tube fuse. Since the fuse holders are arranged without protruding, the fuse holders are made compact in the longitudinal direction and the radial direction, respectively, and the space for mounting parts for automobiles or the like is reduced. In addition, a pipe fuse, a first contact, both terminals, and a waterproof rubber plug are inserted into a holder main body, a second contact and a waterproof packing are inserted into a cover, and the cover is fitted to the holder main body. Since the work can be performed automatically, improvement of productivity and reduction of cost can be achieved by automation of manufacturing.
[0035]
Further, according to claim 2, since the contact portion of the first contact are positioned folded, the first contact and the first terminal is positioned in parallel can be connected in the longitudinal direction as described above Contributes to downsizing. Further, according to the third aspect, excessive displacement of the contact spring portion of the second contact is prevented, and a strong contact pressure is exerted on the tube fuse, so that the reliability of the electrical connection with the tube fuse is improved. According to the fourth aspect, since the opening of the holder main body is made of packing and the insertion hole is made of rubber stopper, both of them are statically sealed, so that the waterproofness is high and the infiltration of water into the fuse holder is reliably prevented. Is done.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view (AA sectional view of FIG. 2) showing one embodiment of a fuse holder according to the present invention.
FIG. 2 is a right side view showing the same fuse holder.
FIG. 3 is a left side view showing the same fuse holder.
FIG. 4 is a sectional view taken along line BB of FIG. 2;
FIG. 5 is a plan view showing the fuse holder (as viewed from above).
FIG. 6 is a longitudinal sectional view (a sectional view taken along line CC in FIG. 7) showing the holder main body on which the first contact and the spacer are mounted.
FIG. 7 is a right side view showing the holder body.
FIG. 8 is a side view showing a first contact.
FIG. 9 is a longitudinal sectional view showing a cover on which a second contact and a packing are mounted.
FIG. 10 is a side view showing a second contact.
FIG. 11 is a longitudinal sectional view showing a first conventional example.
FIG. 12 is a perspective view showing a second conventional example.
FIG. 13 is a plan view showing a third conventional example.
FIG. 14 is a longitudinal sectional view showing a fourth conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fuse holder 2 Holder main body 3 Opening 4 Cover 5 First contact 7 Second contact 9 First terminal 10 Second terminal 11 Waterproof packing 17 Tube fuse insertion hole 21 First insertion holes 25, 69 Contact Spring part 26,52 Male tab part (contact part)
27 Bottom plate 29 Connecting plate 38, 54 Waterproof rubber plug 47 Second insertion hole 62 Annular wall 71 Intermediate extension 76 Notch 77 Lower end surface

Claims (4)

In a fuse holder having a substantially cylindrical holder main body having an opening on one side and a cover closing the opening, a tube fuse insertion hole is formed eccentrically from the opening side in the holder main body, and a bottom side of the holder main body is formed. a second insertion hole for the first insertion hole and a second terminal for the first terminal is formed in parallel with the tube fuse insertion hole from tube fuse insertion hole and said first and second respective insertion and as close the hole is located at the apex of the triangle, and close to one end of the first insertion holes said tube fuse insertion holes, respectively located near the other end of said second insertion holes said tube fuse insertion hole and, the contact spring portion of the first contacts are inserted into the tube fuse insertion hole, the contact portion which is folded back of said first contact is located in the first insertion hole, the said cover second contacts are mounted, the said second contact, said tube fuse inserted Fuse holder and having a contact spring portion for the tube fuse of the inner, and a contact portion which enters into the second insertion hole. The first contactor, a bottom plate portion, the contact spring portion raised from one end of the bottom plate portion in a meandering manner, and a connecting plate raised from the other end of the bottom plate portion; 2. The fuse holder according to claim 1, wherein the fuse holder is constituted by the contact portion folded back from an end of a connection plate. An annular wall is formed in the cover, a notch is provided in the annular wall, a contact spring portion of the second contact is inserted inside the annular wall, and a middle portion of the contact spring portion extends from the notch. 2. The fuse holder according to claim 1, wherein the extension protrudes outward, and the intermediate extension abuts against an end face of the notch to prevent excessive bending of the contact spring. 4. The fuse according to claim 3, wherein a waterproof packing for the holder main body is fitted to the outside of the annular wall, and a waterproof rubber plug integrated with a terminal is fitted to the first and second insertion holes. holder.

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