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JPH07114945

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DESCRIPTION JPH07114945
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
connection structure between a high voltage generator and a high voltage cord.
[0002]
2. Description of the Related Art A piezoelectric type in which a hammer collides with a
piezoelectric element fixed to a piezoelectric base plate to generate piezoelectricity by releasing
the support after the drive plate pushes up the hammer when the ignition knob is rotated. An
igniter is used as an igniter such as a gas table.
[0003]
The high voltage generated by the piezoelectric element is supplied to an ignition electrode
disposed in the gas burner by a high voltage cord connected to the piezoelectric element in a
non-desorbable manner.
[0004]
However, in the case of a non-removable high voltage cord, the cord may interfere with the
assembling operation and the cord may be damaged.
[0005]
Therefore, the inventors of the present invention have a piezoelectric element in which an
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insulating cylindrical portion is provided in a projecting manner in an element housing and a
cylindrical pin is provided in the cylindrical portion, a cylindrical terminal fitting, and a coated
lead having a tip fixed to the terminal fitting. A prototype was made by making a high voltage
cord having a wire and an elastic insulating tube surrounding a terminal fitting, and making the
high voltage cord a separate part, thereby enabling attachment and detachment from the
piezoelectric element.
[0006]
However, it was found that the terminal fitting can be easily detached from the pin when a force
is applied to the high voltage code after connecting the high voltage code to the piezoelectric
element in the above prototype. I did.
[0007]
However, it has been found that the above-mentioned prototype (when the pin is changed to a
flat plate) has the following problems.
[0008]
Since it is necessary to fit the terminal fitting into the pin by hand, it is difficult to fit it in.
Furthermore, after fitting, it is necessary to externally fit the elastic insulating tube to the
insulating cylindrical portion. The outer diameter of the portion is substantially equal in
consideration of preventing high voltage leaks, and therefore, it is difficult to fit in, and it takes
time and effort to connect the high voltage cord and the piezoelectric element.
[0009]
In addition, water or soup easily penetrates from the gap between the elastic insulating tube and
the insulating cylindrical portion, which causes high voltage to leak to the outside through the
invaded water or soup.
[0010]
The first object of the present invention is a connection structure between a high voltage
generator and a high voltage cord, which is easy to connect with high voltage cords, and the
second object is a high voltage generator and high voltage cords which are hard to penetrate
water and juice. To provide a connection structure with
[0011]
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SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention adopts the following constitution.
(1) A high voltage generator in which an insulating cylindrical portion having an insertion hole
having a rectangular cross section is protruded and a flat plate-like pin for outputting high
voltage is disposed in the insertion hole, and a terminal engaged with the pin A high voltage cord
comprising a metal fitting, a coated lead wire having a tip secured to the terminal fitting, and an
elastic insulating tube surrounding the terminal fitting, and the tip end face of the pin is within a
distance x from the tip end face of the cylindrical portion Located at the rear end of the elastic
insulating tube is fixed to the coated lead wire, and the distal end of the terminal fitting is
outward from the opening surface of the elastic insulating tube by a distance y longer than the
distance x When the terminal fitting is engaged with the pin, the external fitting of the elastic
insulating tube to the cylindrical portion is completed.
[0012]
(2) It had the composition of the above (1), and one or a plurality of projections were provided
circumferentially on either one of the cylindrical outer peripheral wall or the tube inner
peripheral wall.
[0013]
[Regarding Claim 1] With the rear end of the elastic insulating tube, the terminal fitting of the
coated lead is engaged with the pin in the cylindrical portion.
[0014]
The terminal fitting is moved close to the cylindrical portion, and the terminal fitting is engaged
with the tip of the pin. However, since the cross-sectional shape of the insertion hole is
rectangular, when the terminal fitting is faced in the cylindrical portion, the terminal fitting is In
this case, the terminal fitting engages with the tip of the pin when it is inserted in this state.
[0015]
The tip end face of the pin is positioned inward of the tip end face of the cylindrical portion by a
distance x, and the tip end of the terminal fitting protrudes outward a distance y (where y> x)
from the opening face of the elastic insulating tube, Since the rear end of the elastic insulating
tube is fixed to the coated lead wire, when the elastic insulating tube is pushed into the
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cylindrical portion, the elastic insulating tube is guided by the engagement of the terminal fitting
and the pin, and the elastic insulating tube leaves the cylindrical portion. To fit.
[0016]
[Claim 2] The ridges provided on the outer peripheral wall of the cylindrical portion or the inner
peripheral wall of the tube prevent the entry of water or boiling water.
[0017]
According to the first aspect of the present invention, since the cross-sectional shape of the
insertion hole is rectangular and the terminal fitting protrudes from the tube opening surface, the
terminal fitting engages with the pin when the terminal fitting is faced in the cylindrical portion.
It becomes natural in the mating direction, and the terminal metal fitting and the pin can be
easily engaged.
[0018]
Distance y> distance x, and since the rear end of the elastic insulating tube is fixed to the coated
lead wire, the elastic insulating tube is guided by the engagement of the terminal fitting of the
coated lead wire and the pin in the cylindrical portion. Since the positioning is performed on the
portion and the fitting is completed, the operation is easy and one-time operation, and the
connection between the high voltage generator and the high voltage cord is not troublesome.
[0019]
[Regarding Claim 2] Since water and boiled water are blocked by the ridges and do not enter the
cylindrical portion, high voltage leak can be prevented.
[0020]
DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment (corresponding to claim
1) of the present invention will be described based on FIGS.
As shown in the figure, the connection structure A between the piezoelectric generator and the
high voltage cord is detachably attached to the piezoelectric generator 1 disposed in the notch
101 of the piezoelectric base plate 100 and the piezoelectric generator 1. It comprises the high
voltage code 2 connected.
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[0021]
As shown in FIGS. 1 and 2, the piezoelectric generator 1 includes a piezoelectric element 11 that
generates high voltage (about 16 kV), a pressing plate 12 that prevents the element from coming
off from the notch 101, and the piezoelectric element 11. The hammer 13 is provided with a
hammer 13 for tapping and a hammer biasing spring 14 for biasing the hammer 13.
[0022]
The piezoelectric element 11 has an insulating plastic housing in which the cylinder 112 is
protruded from the housing back surface 111 (front surface in FIG. 1), and the element body is
molded. A plate-like pin 113 (made of conductive metal) in which a circular hole 113a is formed
is disposed (the direction is horizontal).
[0023]
The cross-sectional shape of the pin 113 for outputting a high voltage corresponds to the pin
113 so that the pin tip is positioned inward of the tip end surface 112a of the cylinder 112 (the
outer periphery, chamfers 112b and 112c on the inner periphery) by the distance x , And are
disposed in the insertion hole 1120 having a rectangular cross section.
[0024]
The pressing plate 12 is a half-folded plate spring, and is inserted into the wide portion 102 of
the notch 101 to bias the piezoelectric element 11 downward in the figure.
[0025]
The hammer biasing spring 14 has a coil shape, and one end thereof is fitted in a spring holding
piece 103 provided on the piezoelectric base plate 11, and the other end is fitted in a recess 131
of the hammer 13.
[0026]
The hammer 13 has a bar-like shape, and is biased toward the piezoelectric element 11
(downward in the figure) by the hammer biasing spring 14.
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Further, as shown in FIG. 2, the hammer 13 is pushed up by the drive piece 105 a of the drive
plate 105 that rotates in conjunction with the rotation of the shaft 104.
[0027]
As shown in FIGS. 1 and 3, the high voltage cord 2 is composed of a terminal fitting 21, a covered
lead wire 22 electrically connected to the terminal fitting 21, and a rubber tube 31 surrounding
the terminal fitting 21.
[0028]
The terminal fitting 21 is formed of a conductive metal, and has a tip end portion 211 inserted
into the pin 113 and a rear portion 212 that crimps and fixes the core wire 221 of the coated
lead wire 22.
[0029]
The tip end portion 211 has an arc-shaped portion that is curved so as to be rolled in the
direction of the plate surface from each edge of the flat plate portion, and in the gap formed
between the flat plate portion and the tip of the arc portion. The pin 113 is inserted.
Further, on the flat plate portion at the rear of the tip end portion 211, a circular protrusion
211a to be fitted into the circular hole 113a of the pin 113 is formed.
[0030]
The coated lead wire 22 is formed by coating the core wire 221 with rubber, and the rear end of
the core wire 221 is connected to an ignition electrode (none of which is shown) disposed near
the gas burner.
[0031]
A rubber tube 31 (made of rubber having electrical insulation) has an inner diameter
substantially the same as the outer diameter of the cylinder 112, and a large diameter portion
311 (left in the figure) surrounding the terminal fitting 21; A small diameter portion 312
adhesively fixed to the coating is provided, and the tip of the terminal fitting 21 is positioned so
as to protrude outward by a distance y (where y> x) from the tube opening surface 311a.
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[0032]
Here, a connection method of the piezoelectric generator 1 and the high voltage code 2 will be
described.
The tip end of the terminal fitting 21 of the high voltage cord 2 which has the small diameter
portion 312 (rear end) of the rubber tube 31 and is in a horizontal state, is made to face in the
insertion hole 1120 of the cylinder 112 and then pushed. The tip end portion 211 (gap) of the
metal fitting 21 is automatically positioned by the insertion hole 1120 with respect to the tip end
of the pin 113, and the tip end portion 211 (gap) is fitted into the tip end of the pin 113.
[0033]
Furthermore, as it is moved, the terminal fitting 21 is fitted into the pin 113 and the terminal
fitting 21 is fitted into the pin 113, and the distances x and y are set. Guided to the engagement,
the rubber tube 31 is put on the cylinder 112, and when it is further pushed in, the circular
projection 211a is fitted in the circular hole 113a, and the terminal fitting 21 and the pin 113
are completely engaged.
[0034]
When the fitting of the terminal fitting 21 and the pin 113 is completed, the fitting of the rubber
tube 31 and the cylinder 112 is also completed.
[0035]
The present embodiment has the following advantages.
[A] Since the cross-sectional shape of the insertion hole 1120 is rectangular and the terminal
fitting 21 protrudes from the tube opening surface 311a, if the terminal fitting 21 is inserted into
the cylinder 112, the terminal fitting 21 is naturally fitted to the pin 113 It can be included.
[0036]
Since the distance y> the distance x and the small diameter portion 312 of the rubber tube 31 is
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adhesively fixed to the coating of the sheathed lead wire 22, the rubber is guided by the
engagement between the terminal fitting 21 and the pin 113. Since the tube 31 is positioned
with respect to the cylinder 112 and the fitting is completed, the fitting operation is easy and
done in one operation, and the connection between the piezoelectric generator 1 and the high
voltage cord 2 does not take time and effort.
[0037]
[A] Since the pin 113 disposed in the cylinder 112 is flat and the terminal fitting 21 of the high
voltage cord 2 is shaped so as to be externally fitted to the pin 113, it is difficult to be detached
and the fitting is reliable and after fitting , The fitting part is not damaged and contact failure
does not occur.
[0038]
Further, since the circular protrusion 211a is formed on the flat portion at the rear of the tip end
portion 211 of the terminal fitting 21 and the circular hole 113a is formed on the tip of the pin
113, completion of the fitting can be determined (according to sound and feedback) Even if the
high voltage cord 2 is pulled backward, the terminal fitting 21 does not easily come off the pin
113.
[0039]
[C] Since the chamfers 112b and 112c are provided on the outer and inner circumferential sides
of the tip end surface 112a of the cylinder 112, the terminal fitting 21 can be easily inserted into
the insertion hole 1120 (by the chamfer 112c). It is easy to put on (by chamfer 112b).
[0040]
Next, a second embodiment (corresponding to claim 2) of the present invention will be described
based on FIGS.
[0041]
The present embodiment is different from the first embodiment only in that protrusions 41 and
42 are provided around the outer periphery of the cylinder 112.
[0042]
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Since the protrusions 41 and 42 provided around the outer periphery of the cylinder 112
prevent water and boiled water from entering the cylinder 112, leakage of high voltage of the pin
113 can be prevented, and ignition failure can be prevented. .
Moreover, since the rubber tube 31 becomes difficult to remove from the cylinder 112 by the
protrusions 41 and 42, the connection between the high voltage cord 2 and the piezoelectric
generator 1 becomes stronger.
[0043]
The present invention includes the following embodiments in addition to the above
embodiments.
a.
The cross-sectional shape of the insulating cylindrical portion and the elastic insulating tube may
be triangular, square, rectangular, polygonal, elliptical, etc., in addition to a circle.
[0044]
b.
In the second embodiment, the directions of the protrusions 41 and 42 are perpendicular to the
cylinder 112, but may be inclined.
In this case, as shown in FIG. 6, when the housing back surface 111 is inclined, the rubber tube
31 can be easily fitted into the cylinder 112 and can be made more difficult to come off, and the
penetration of water and soup can be made more effective. It can be blocked.
[0045]
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c.
The protrusions 41 and 42 may be provided on the inner peripheral wall surface of the rubber
tube 31.
[0046]
d.
An elastic insulating tube may be provided on the high voltage generator side, and a cylinder
may be provided on the high voltage cord side.
In the above embodiment, the terminal fitting on the elastic insulating tube side is externally
fitted to the pin on the high voltage generator side, but the pin on the high voltage generator side
is externally fitted to the terminal fitting on the elastic insulating tube side It is good.
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