JPH0913755A - Power supply device for sliding door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure contact between a door electrode and a frame electrode even when their right and left positions are deviated from each other without producing a contact failure and enable a contact area between both door and frame electrodes to be cleaned in automatic mode and keep a normally energized state in a favorable state. SOLUTION: A box-shaped guard member 1, which projects outside from a door frame 2 and opens the front, is integrally provided on a frame side contact case 4 where frame electrodes 3a and 3b are provided inside this guard member 1. When the door is closed, a door side contact case 9 provided with door electrodes 8a and 8b is fitted in the guard member 1 while the door electrodes 8a and 8b are placed in contact with the frame electrodes 3a and 3b inside the guard main body 11. One is arranged to be fixed out of the door electrodes 8a and 8b and the frame electrodes 3a and 3b while the other is adapted be movable, thereby sliding the contact between both electrodes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for a sliding door for supplying an operating current to an electric device such as an electric lock provided on the sliding door.

[0002]

2. Description of the Related Art Conventionally, as a power feeding device for a sliding door of this type, one described in Japanese Utility Model Laid-Open No. 5-40552 is known.

In the power feeding device described in the above publication, a power receiving side contact and a power feeding side contact that come into contact with each other when the door is closed to form an energized state are provided opposite to the sliding door and the door frame that receives the sliding door. An opening / closing confirmation switch that is sometimes activated to form an energized state is provided, and when the door is closed, the contact on the power feeding side is energized by operating the opening / closing confirmation switch. Further, the contact on the power feeding side has a pair of plate-shaped electrodes vertically arranged in a fixed state in a contact case fixed to a door frame. The contact on the power receiving side is biased in a contact case fixed to a sliding door so as to be openable and closable in a closed state. It is stored separately.

[0004]

However, according to the above-described power feeding device of the conventional example, when the door is closed, the contact electrodes of the power receiving side contact open the contact between the electrodes of the power receiving side contact to make a mating contact. However, since the energized state is formed, it may be difficult to position the electrode on the power feeding side and the electrode on the power receiving side (between the contacts) due to rattling of the sliding door or the like, and a contact failure may occur between them. there were.

The tip of the electrode of the power feeding side contact is covered with a cover when the door is opened, but when the door is closed, the cover is retracted by the power receiving side contact of the sliding door to expose the tip of the electrode. However, there is a risk that the exposed electrode portion may be touched by the hand and an electric shock may occur.

When the door is closed, there is generally a small gap between the power feeding side contact (including the cover body) and the power receiving side contact including the sliding door end.
There is a problem in that the electric lock attached to the door is illegally unlocked by damaging or moving the electrode that is energized and held through the gap.

The present invention eliminates the above-mentioned conventional drawbacks and eliminates the occurrence of a short circuit by sliding the contact between the door-side electrode and the frame-side electrode to improve the current-carrying condition at all times. An object of the present invention is to provide a power supply device for a sliding door that can be downsized.

[0008]

A power supply device for a sliding door according to the present invention includes a sliding door and a door frame that receives the sliding door, and a door-side electrode and a frame-side electrode that come into contact with each other when the door is closed to form an energized state. In a power supply device for a sliding door formed oppositely, while the door-side electrode is housed in a door-side contact case fixed to the sliding door,
The frame-side electrode is housed in a frame-side contact case fixed to the door frame, and the frame-side contact case is integrally provided with a box-shaped guard body projecting outward from the door frame and having a front opening. The frame side electrode is provided inside the guard body, and when the door is closed, the door side contact case fits the guard body, and the door side electrode and the frame side electrode contact each other inside the guard body. It is characterized by being configured.

One of the door-side electrode and the frame-side electrode is fixed inside the door-side contact case or the frame-side contact case, and the other is movably provided inside the frame-side contact case or the door-side contact case. It is preferable that the contacts of the door-side electrode and the frame-side electrode slide when the door is closed.

The door-side electrode is movably provided inside the door-side contact case, and the frame-side electrode is movably provided inside the frame-side contact case. When the door is closed, the contact between the door-side electrode and the frame-side electrode is It can also be configured to slide.

The frame-side contact case is formed integrally with a guard body protruding from the opening of the front plate to the outside of the guard body, and has a vertical length longer than that of the guard body. And one end of the frame-side contact case body is pivotally supported at the top and bottom of the frame-side contact case body, and a pair of frame-side electrodes facing the inside of the guard body are oppositely provided, while the door side The contact case is formed in a substantially box shape having an empty chamber with an opening at the front, and a pair of door-side electrodes that come into contact with the pair of frame-side electrodes when the door is closed are provided in opposition to the empty chamber. Is preferred.

Either the door-side electrode or the frame-side electrode is preferably formed of a thin plate.

[0013]

[Function] The frame-side contact case is integrally provided with a box-shaped guard body that projects outward from the door frame and has an opening at the front, and the frame-side electrode is provided inside the guard body. Since the provided door-side contact case fits the guard body and the door-side electrode and the frame-side electrode contact each other inside the guard body, the door-side electrode and the frame-side electrode are closed when the door is closed. The electrodes do not have to be directly aligned. That is, the opening area of the door-side contact case that houses the door-side electrode is considerably larger than the occupied area of the door-side electrode, and the guard body inserted through the opening of the door-side contact case is also larger than the frame-side electrode. Since it has an occupied area, it is easy to position the guard body in the door side contact case when the door is closed, and the door side electrode and the frame side electrode are naturally aligned by simply fitting them, and the left and right electrodes of both electrodes are aligned. Ensures contact even if there is a position shift.

Since the frame side electrode, which is the charging portion, is covered inside the guard body, it protects the frame side electrode and
The frame-side electrode is not touched by the hand, does not cause an electric shock, and is not unlocked from the outside.

One of the door-side electrode and the frame-side electrode is fixed, the other is movably provided, and the contacts of both electrodes are slid so that the contact portions can be automatically cleaned, so that a short circuit occurs. There is always a good energization state.

[0016]

Embodiment 1 Embodiment 1 of the present invention is shown in FIGS.
This will be described below with reference to FIG. 1 is a vertical cross-sectional view of a sliding door power supply device according to Embodiment 1 when the power supply device is closed, FIG. 2 is a vertical cross-sectional view of the power supply device when the door is open, and FIG. 3 is an exploded perspective view of a frame-side contact case. Is an exploded perspective view of the door side contact case, FIG. 5 is a front view of the frame side contact case, and FIG. 6 is an overall schematic view of the sliding door.

Reference numeral 1 is a sliding door, and 2 is a door frame for receiving the sliding door 1. The door frame 2 is provided with a frame-side contact case 4 having a pair of frame-side electrodes 3a and 3b.
a is connected to one terminal 6a of the power source 6 via the lead wire 5, and the other frame side electrode 3b is connected to the other terminal 6b of the power source 6 via the lead wire 7.

On the end face side of the sliding door 1, a pair of door-side electrodes 8a and 8b which, when closed, come into contact with the pair of frame-side electrodes 3a and 3b provided in the frame-side contact case 4 to form an energized state. A door-side contact case 9 is provided.

The frame side contact case 4, the door side contact case 9 and their internal structures will be described in detail below.

That is, the frame-side contact case 4 is made of an insulating material such as a synthetic resin, and the frame-side contact case body 10 has a rear portion having a longer vertical length, and the front portion has a shorter vertical length than the frame-side contact case body 10. And front plate 12
Is integrally formed with the guard body 11 that is exposed to the outside through the opening 12a. At both ends of the upper part of the case body 10, screw columns 13 are horizontally extended toward the rear part. Insertion holes 14a and 14b formed at one end of the frame-side electrodes 3a and 3b made of a plate-shaped bent piece and made of a conductive material such as metal are inserted into the screw columns 13. And
The back cover 16 is pressed against the rear surfaces of the insertion holes 14a and 14b via the springs 15 and 15, and the screw holes 17 and 17 of the back cover 16 are pressed.
The screws 18, 18 are screwed into the screw columns 13, 13 via the spring 15 and the insertion holes 14a, 14b. As a result, one ends of the frame side electrodes 3a and 3b are pivotally supported, and
The other parts of the frame-side electrodes 3a, 3b are provided opposite to each other so as to face the inside of the guard body 11 (including the frame-side contact case body 10). As the frame-side electrodes 3a and 3b, the springs 15 and 15 may be omitted and plate-shaped plate springs may be used.

Further, in the first embodiment, the frame side electrode 3
The lead wire 5 connected to a and the lead wire 7 connected to the frame-side electrode 3b are recessed grooves 19a, 19 formed on the rear surface of the back cover 16.
It is designed to fit in b. However, the configuration is not limited to this.

As described above, the frame-side contact case 4 incorporating the frame-side electrodes 3a and 3b is fitted with the front plate 12 from the front, and the front plate 12 is fixed to the frame-side contact case 4 with the screw 20. The frame side contact case 4 in this state is embedded in the recessed notch 21 of the door frame 2 which is formed in advance, and the front plate 12 is fixed to the front surface of the door frame 2 with the screw 22. Therefore, even when the frame-side contact case 4 is fixed to the door frame 2, the guard body 11 projects outward from the door frame 2 (front plate 12). In addition, the frame-side electrodes 3a and 3b are arranged as shown in FIG.
Further, as shown in FIG. 5, the vertical plate portion 30 at the tip of the guard body 11 faces the opening 11a of the guard body 11 in a vertical state.

The door-side contact case 9 is made of a synthetic resin or a metal material in a substantially box-like shape having an empty space 41 with an opening 40 at the front. It is preferably manufactured. The door-side contact case 9 includes a door-side contact case body 42 formed in a substantially box shape and an opening 40 of the door-side contact case body 42.
The front plate 43 is arranged on the front surface. A through-hole 44 communicating with the opening 40 (vacant chamber 41) of the door-side contact case body 42 is formed in the center of the front plate 43, and the door-side contact case body is formed at the upper and lower edges of the through-hole 44. Bent pieces 45 and 46 to be inserted into the vacant chamber 41 of 42 are provided in a protruding manner, and pin holes 55 and 56 are formed slightly above or below the through hole 44. Therefore,
The bent pieces 45 and 46 of the front plate 43 are fitted into the vacant chamber 41 of the door-side contact case body 42, and the door-side contact case body 4 is inserted into the pin holes 55 and 56 of the front plate 43.
The pins 53 and 54 projecting from the mounting pieces 47 and 48 that are integrally projected or welded to the upper and lower surfaces of 2 are inserted. Then, the bent pieces 45 and 46 and the attachment pieces 47 and 48
The door side contact case main body 42 and the front plate 43 are connected by fixing the screws with screws 49 ... 49.

One side surface (the right side surface in FIG. 4) of the door-side contact case main body 42 is slightly recessed inward, and both upper and lower parts inside the recessed surface 50 and a thin plate shape in the vacant chamber 41. Further, the L-shaped door-side electrodes 8a and 8b are fixed by fixing means 51 ... 51 such as screws or welding. In this case, the door-side electrodes 8a and 8b have openings 40 and through holes 44 of the front plate 43.
It is provided so as to be located on the vertical center line of. Door side electrode 8
The tips of a and 8b are sharpened, and when the tips 52 and 52 are closed, the pair of leaf-spring-shaped frame-side electrodes 3a and 3b are provided.
The vertical plate portion 30 is contacted to maintain the energized state.

As described above, the door-side contact case 9 having the door-side electrodes 8a, 8b and the front plate 43 attached thereto,
The front plate 43 is fixed to the front surface of the vertical frame 1a of the sliding door 1 with a screw 58 by embedding it in a recessed notch 57 formed in the end face of the vertical frame 1a of the sliding door 1 which is formed in advance.

One ends of lead wires 60 and 61 are connected to the bases of the door electrodes 8a and 8b, respectively, and the other ends of the lead wires 60 and 61 are connected to an actuator 63 of an electric device 62 such as an electric lock. (See FIG. 6). In FIG. 6, reference numeral 64 is a receiving metal fitting for retracting a lock rod (not shown) of the electric lock 62. Reference numeral 59 is a screw hole through which the screw 58 is inserted.

Frame side electrodes 3a, 3b and door side electrodes 8a, 8b
6 is provided as described above, the frame side contact case 4 having the frame side electrodes 3a and 3b and the door side electrode 8a in the opened state in which the sliding door 1 is opened in the door opening direction X in FIG. 2b and the door-side contact case 9 having
Shows a state such as.

That is, in the opened state, as shown in FIG. 2, the guard body 11 of the frame-side contact case 4 projects to the outside, and the frame-side electrode pivotally supported in the frame-side contact case 4 is rotatably supported. Vertical plate portions 30 and 3 of 3a and 3b
While 0 is in a vertical posture, the tips of the door-side electrodes 8a and 8b provided on the door-side contact case 9 face the vertical plate portions 30 and 30 of the frame-side electrodes 3a and 3b. Since the pivotally supporting portions (the screws 18) of the frame-side electrodes 3a and 3b are constantly pressed by the spring 15, the free end side thereof can be freely rotated with the pivotally supporting portion as a fulcrum.

When the sliding door 1 is closed in the closing direction (Y direction in FIG. 2) in the open state, the guard body 11 of the frame side contact case 4 is emptied through the through hole 44 on the door side contact case 9. Fitted and housed in the chamber 41. When the door is closed, the tip portions 52, 52 at the tips of the door-side electrodes 8a, 8b are
Although the frame side electrodes 3a, 3b contact the front surface of the vertical plate portion 30 of the present invention, the frame side electrodes 3a, 3b of the present invention are rotatably provided with the pivot portion as a fulcrum, so that the sliding door 1 is shown in FIGS. By the time the door is completely closed as shown in 6,
2 is an initial contact point a, c on the plane of the vertical plate portions 3a, 3b.
From the end contact b, d to the distance L1, L2 between the spring 1
It slides while pressing while resisting the biasing force of 5. Therefore, since the electrodes clean the deposits by contact friction with each other, the power supply state is always good without causing a short circuit, and the electric device 62 provided in the sliding door 1 is always stably and reliably fed with power. You can

When the sliding door 1 is opened in the opening direction X from the closed state of FIGS. 1 and 6, the tip portions 52 of the door-side electrodes 8a and 8b are vertical plate portions of the frame-side electrodes 3a and 3b as shown in FIG. When it is separated from 30, the energization is stopped and the current stops flowing.

[0031]

Second Embodiment of the Invention A second embodiment of the present invention will be described below with reference to FIGS. 7 and 8. FIG. 7 is a vertical cross-sectional view of the power supply device for a sliding door according to the second embodiment when the door is opened, and FIG.
FIG. 5 is a vertical cross-sectional view of the power feeding device for the sliding door when the door is closed. In this case also, the configuration as shown in FIG. 6 can be applied.

In the second embodiment, the first embodiment
Compared to the second embodiment, the frame-side electrodes 3a and 3b are fixed inside the frame-side contact case 4, and the door-side electrodes 8a and 8b are movably provided inside the door-side contact case 9, and when the door is closed. Door side electrodes 8a, 8b and frame side electrode 3a,
The contact with 3b is made to slide. That is, the frame-side electrodes 3 a and 3 provided on the frame-side contact case 4
As b, the plate-shaped L-shaped door-side electrodes 8a and 8b provided on the door-side contact case 9 in the first embodiment are used, and the door provided on the door-side contact case 9 is used. As the side electrodes 8a and 8b, the frame-side electrodes 3a and 3b provided on the frame-side contact case 4 in the first embodiment are used.
The structure is substantially the same as that of the first embodiment, and is substantially the same as the first embodiment, and the other configurations are substantially the same.

That is, the frame-side contact case 4 of the second embodiment is substantially the same as that of the first embodiment, but in the second embodiment, as shown in FIG.
1 has no internal bent portion 11b at the edge of the opening 11a, and has a recessed surface 70 similar to the recessed surface 50 formed on one side surface of the door-side contact case 9 in the first embodiment. The difference from the first embodiment is in the point.

One side surface of the frame-side contact case 4 is slightly recessed inward, and thin plate-shaped and L-shaped frame-side electrodes 3a and 3b are formed on both upper and lower portions inside the recessed surface 70. It is fixed by fixing means 71 ... 71 such as screws and welding. In this case, the frame-side electrodes 3a and 3b are provided so as to be located on the vertical center line of the opening 11a of the guard body 11. A tip 72 is formed at the tip of each of the frame-side electrodes 3a and 3b, and when the door is closed, the tip 72 contacts the vertical plate portions 31 and 31 of a pair of leaf spring-shaped door-side electrodes 8a and 8b, which will be described later. Then, the energized state is maintained.

Door-side contact case 9 of the second embodiment
The third embodiment is different from the first embodiment in that the recessed surface 50 as shown in FIG. 1 is not formed, and the other configurations are the same. Moreover, since the door-side contact case body 42 and the front plate 43 are coupled as described in the first embodiment, this point will not be described again.

In the upper and lower portions of the rear wall 9a of the door-side contact case 9 of the second embodiment, screw columns 73 and 74 are horizontally extended, and the screw columns 73 and 74 are provided with springs 75 and 7, respectively.
One end of a pair of leaf spring-shaped door-side electrodes 8a and 8b is pivotally supported by screws 76 and 76 through 5. This door side electrode 8a, 8b
The other vertical plate portions 31, 31 are made to face the front portion of the empty chamber 41 of the door-side contact case 9 so as to face the frame-side electrodes 3a, 3b.

Therefore, when the sliding door 1 is closed from the open state as shown in FIG. 7 until it is completely closed as shown in FIG. 8, the guard body 11 causes the vacant chamber 4 of the door side contact case 9 to be closed.
1 is fitted and housed in the frame 1, and the tip portions 7 of the frame-side electrodes 3a and 3b.
2, 72 slide on the vertical plate portion 31 of the door-side electrodes 8a, 8b. In this way, the frame side electrodes 3a, 3b and the door side electrodes 8a, 8
Regarding the effect of sliding the contact point with b,
This is as described in the first embodiment.

[0038]

Third Embodiment of the Invention A third embodiment of the present invention will be described below with reference to FIGS. 9 and 10. FIG. 9 shows the third embodiment.
10 is a vertical cross-sectional view of the sliding door power supply device when the door is opened, and FIG. 10 is a vertical cross-sectional view of the sliding door power supply device when the door is closed. Also in this case, it can be applied as shown in FIG.

In the third embodiment, the door side electrodes 8a and 8b are movably provided inside the door side contact case 9, and the frame side electrodes 3a and 3b are movably provided inside the frame side contact case 4, respectively. In addition, when the door is closed, the contacts between the door-side electrodes 8a and 8b and the frame-side electrodes 3a and 3b slide.

That is, in the third embodiment, not only the movable frame-side electrodes 3a and 3b but also the frame-side contact case 4 that houses the electrodes 3a and 3b, the guard body 11, and the back cover 1 are provided.
The frame-side contact portion such as 6 has the same configuration as that of the first embodiment. On the other hand, one of the door-side contact parts
Embodiment 1 is that the pair of door-side electrodes 8a and 8b are movable.
Although different from the door contact case 9 and the front plate 43
Other configurations are the same as those of the first embodiment.

In the third embodiment, a pair of L-shaped door-side electrodes 8a and 8b are provided in the vacant chamber 41 of the door-side contact case 9 so as to make the pair of door-side electrodes 8a and 8b movable. The door electrodes 8a and 8b are housed and one end of each of the door electrodes 8a and 8b is rotatably supported on the side wall of the door contact case 9 by pivots 80 and 81. At the same time, on the rear surface of the door-side electrodes 8a, 8b, a spring 82 is formed between the door-side contact case 9 and the rear wall 9a,
83 is elastically supported, and the tip portions 84, 84 of the door-side electrodes 8a, 8b
Is normally biased to project in the projecting direction.

When the door is opened as shown in FIG. 9 and the door is closed as shown in FIG. 10, the tip portions 84, 84 of the door-side electrodes 8a, 8b are pressed against the vertical plate portions 30, 30 of the frame-side electrodes 3a, 3b to conduct electricity. State is retained. In this case, the vertical plate portions 30, 30 are urged by the spring 15 in the protruding direction, and the tip portions 84, 84 of the door-side electrodes 8a, 8b are urged by the springs 82, 83 in the protruding direction. Therefore, since the contacts slide while pressing each other, a stable and reliable energized state can be obtained.

9 and 10, the door electrodes 8a, 8b and the springs 82, 83 of L or more are arranged in the frame contact case 4, and the vertical plate portion 30 is arranged in the door contact case 9. It is also possible to adopt a configuration in which the frame-side electrodes 3a and 3b are provided so that the left and right sides are reversed and both electrodes 8a and 8b: 3a and 3b are movable.

The door side electrodes 8a and 8b of the first and third embodiments and the frame side electrodes 3a and 3b of the second embodiment.
Since both are plate-shaped, it is possible to supply a thin sliding door power supply device that can be attached even if the door-side contact case 9 or the frame-side contact case 4 has a small thickness and the door thickness is small.

[0045]

【The invention's effect】

(1) According to the invention as set forth in claim 1, a box-shaped guard body projecting outward from the door frame and having a front opening is integrally provided in the frame-side contact case, and the frame-side electrode is provided inside the guard body. The door-side contact case provided with the door-side electrode fits the guard body when the door is closed, and since the door-side electrode and the frame-side electrode are in contact with each other inside the guard body, When the door is closed, it is easy to position the guard body on the door-side contact case, and by simply fitting it, the door-side electrode and the frame-side electrode are naturally aligned, and even if there is a left-right misalignment of both electrodes It will not come into contact with and cause poor contact. Moreover, when lateral pressure acts on the door when the door is closed, the guard body protects the frame-side electrode and the door-side electrode, and therefore the lateral pressure does not directly act on both electrodes.

(2) Further, in the above structure, the frame-side electrode, which is a charging portion, is covered inside the guard body, so that the frame-side electrode is protected and the frame-side electrode is touched by the hand. There is no electric shock and there is no illegal unlocking from the outside.

(3) According to the second aspect of the invention, one of the door-side electrode and the frame-side electrode is fixed and the other is movably provided so that the contacts of both electrodes slide. Since the contact points can be automatically cleaned, there is no short circuit, and the state of continuous energization is good.

(4) In this case, as described in claim 3,
The door-side electrode is movably installed inside the door-side contact case, and the frame-side electrode inside the frame-side contact case.When the door is closed, the contacts between the door-side electrode and the frame-side electrode slide. Then, the contacts of the door-side electrode and the frame-side electrode slide while pressing each other, so that the energized state can be obtained more stably and reliably.

(5) According to the fourth aspect, according to the structure in which the pair of leaf-spring-shaped frame-side electrodes and the pair of door-side electrodes are in contact with each other, the energization state when the door is closed is more stable. It is definitely obtained.

(6) As described in claim 5, since either the door-side electrode or the frame-side electrode is formed of a thin plate, the thickness of the electrode becomes thin, so that the number of constituent members is small. The door-side contact case or the frame-side contact case that accommodates the electrode can be made small.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a power supply device for a sliding door according to a first embodiment of the present invention when the door is closed.

2 is a vertical cross-sectional view of the sliding door power supply device of FIG. 1 when the door is opened.

FIG. 3 is an exploded perspective view of a frame side contact case.

FIG. 4 is an exploded perspective view of a door-side contact case.

FIG. 5 is a front view of a frame-side contact case.

FIG. 6 is an overall schematic view of a sliding door.

FIG. 7 is a vertical cross-sectional view of the power supply device for a sliding door according to the second embodiment of the present invention when the door is opened.

8 is a vertical cross-sectional view of the sliding door power supply device of FIG. 7 when the door is closed.

FIG. 9 is a vertical cross-sectional view of the sliding door power supply device according to the third embodiment of the present invention when the door is opened.

10 is a vertical cross-sectional view of the sliding door power supply device of FIG. 9 when the door is closed.

[Explanation of symbols]

 1 Sliding Door 2 Door Frame 3a, 3b Frame Side Electrode 4 Frame Side Contact Case 5, 7 Lead Wire 6 Power Supply 8a, 8b Door Side Electrode 9 Door Side Contact Case 10 Frame Side Contact Case Main Body 11 Guard Body 12 Front Plate 15 Spring 16 Back Lid 18 Screw 30 Vertical plate part 31 Vertical plate part 40 Opening 41 Vacancy 42 Door side contact case body 43 Front plate 44 Through hole 45, 46 Bending piece 50 Recessed surface 51 Fixing means 52 Tip part 60, 61 Lead wire 62 Electric Equipment (electric lock) 70 Recessed surface 71 Fixing means 72 Tip portion 84 Tip portion a, c Initial contact point b, d Final contact point

Claims (5)

[Claims] 1. A power supply device for a sliding door, comprising: a sliding door and a door frame that receives the sliding door, and a door-side electrode and a frame-side electrode that come into contact with each other when the door is closed to form an energized state. The electrodes are housed in a door-side contact case fixed to the sliding door, while the frame-side electrodes are housed in a frame-side contact case fixed to the door frame, and the frame-side contact case projects outside the door frame. In addition, a box-shaped guard body having an opened front portion is integrally provided, and the frame-side electrode is provided inside the guard body. When the door is closed, the door-side contact case fits the guard body and A power supply device for a sliding door, wherein the door-side electrode and the frame-side electrode are configured to contact each other inside the body. 2. One of the door side electrode and the frame side electrode is fixed inside the door side contact case or the frame side contact case, and the other is movably provided inside the frame side contact case or the door side contact case. The power supply device for a sliding door according to claim 1, wherein the contacts between the door-side electrode and the frame-side electrode slide when the door is closed. 3. The door side electrode is movably provided inside the door side contact case, and the frame side electrode is movably provided inside the frame side contact case. When the door is closed, the contact between the door side electrode and the frame side electrode is made. The power supply device for a sliding door according to claim 1, which is configured to slide. 4. The frame-side contact case is formed integrally with a guard body protruding outside from an opening of a front plate and a rear portion of the guard body, and has a vertical length longer than that of the guard body. A case main body, one end of which is vertically supported in the frame side contact case main body, and the other side of which faces the inside of the guard body. The door-side contact case is formed in a substantially box shape having a vacant chamber having a front opening, and the vacant chamber is provided with a pair of door-side electrodes that come into contact with the pair of frame-side electrodes when the door is closed. The power supply device for a sliding door according to claim 2. 5. The power supply device for a sliding door according to claim 2, wherein either the door-side electrode or the frame-side electrode is formed of a thin plate.