JPH0356989Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a positioning structure for a reed switch, and relates to a positioning structure suitable for application to, for example, a reed switch that issues a stop signal to a motor that is the rotation source of a damper device. be.

BACKGROUND ART For example, in a refrigerator that includes a divided freezer compartment and a refrigerator compartment, cold air from the freezer compartment is sent into the refrigerator compartment. This cold air is controlled by opening and closing a bumper of a damper device provided in a passage connecting the freezer compartment and the refrigerator compartment.

A motor is used as a rotation source for this damper device, and the rotation of this motor is transmitted to a cam for operating a switch via a suitable reduction gear. This cam moves the magnet that operates the reed switch, changes the relative distance between the magnet and the reed switch, turns the reed switch on or off, and thereby stops the rotating motor. It is designed to generate a signal to cause the

Since the on/off state of the reed switch is determined by the relative distance between the magnet and the reed switch, it is essential to securely fix the reed switch in a fixed position.

By the way, in the past, the reed switch had a structure in which the end of the reed piece was simply fixed to a printed circuit board, or it was fixed in a groove formed in a case etc. using the outer periphery of the glass tube of the reed switch as a guide. It had a structure that was However, in the former structure, since the mounting position of the reed switch is not determined, there is a problem in that the operating position of the reed switch is inconsistent. Furthermore, in the latter structure, since the outer periphery of the glass tube is held, the glass tube is likely to break. originally,
Glass tubes have large variations in manufacturing. Therefore, in order to prevent the glass tube from breaking, it is necessary to provide a clearance with respect to the groove of the case, etc., which causes a problem in that the operating position is misaligned by the amount of clearance. Furthermore, in addition to the deviation of the operating position due to the above-mentioned clearance, there is also the problem that deviation occurs due to misalignment of the center of the glass tube and the lead piece.

Purpose of the invention Therefore, the purpose of the present invention was to solve the above-mentioned problems and to
An object of the present invention is to provide a positioning structure for a reed switch that can stabilize the off-operation position and prevent the glass tube of the reed switch from breaking.

Summary of the Invention Therefore, in the present invention, the reed piece holding portion that holds the reed piece of the reed switch is made into a regulating portion that regulates the attachment position of the reed switch. In this way, by holding a reed piece with a stable outer diameter dimension without holding the outer peripheral surface of the glass tube, the operating distance between the reed switch and the magnet is stabilized, and the reed switch The on/off operation position can be stabilized. Furthermore, since the glass tube is not held, breakage of the glass tube can be prevented.

Configuration of the Embodiment Hereinafter, details of the present invention will be explained using the embodiment shown in the drawings.

1 and 2 show a damper device 1 employing the reed switch positioning structure of the present invention. This damper device 1 is assembled by a buffle 3 that opens and closes an opening 2a of a frame 2, and a motor 4 for driving this buffle 3. The motor 4 is integrally attached to the other surface of the frame 2 along with the base plate 5 and gear case 6. Further, the pinion 7 of the output shaft of the motor 4 protrudes from the base plate 5, faces the inside of the gear case 6, and meshes with a large tooth portion of the composite gear 8. And this composite gear 8
The small teeth of the composite gear 9 mesh with the large teeth of the composite gear 9, and the small teeth of the composite gear 9 mesh with the gear 10, ultimately transmitting rotation to the gear 11. These composite gears 8, 9 and gear 10 constitute a reduction gear train, and these and other gears 11 are connected to pins 12, 13, 14 fixed to gear case 6.
Alternatively, it is rotatably supported between the gear case 6 and the base plate 5 by a shaft 15 that is integrated with the gear 11 .

The gears 10 and 11 mesh with each other at a gear ratio of 1:1, and integrally form a plate cam 16 and an end cam 17, respectively. One of the plate cams 16 has a central angle of 180 degrees and forms a high part and a low part, and their outer peripheral parts are in contact with one end of the switch lever 18. This switch lever 1
8, as shown in detail in FIG.
0, the plate cam 16 is always biased in a direction in contact with the circumferential surface of the plate cam 16, and the tip portion holds the magnet 21 as shown in FIG.

Now, a method of insert molding the switch lever 18 will be explained using FIGS. 3 to 5. First, as shown in FIG.
The movable side mold 23 is butted against. At this time, a magnet 21 is placed in advance in the space defined by the fixed mold mold 22 and the movable mold mold 23, and the hexahedrons of the upper and lower, left and right, front and rear sides of the magnet 21 are arranged in advance. Positioning pins 26, 27, 28 of the fixed mold 22 and 24, 25 of the movable mold 23 are abutted against the side surfaces of five of them from a predetermined direction, and the magnet 21 is moved into the space. The position is fixed. Note that one positioning pin 24 is
As shown in FIG. 5, the elastic force of the spring 29 always urges the magnet 21 to the right side in FIG. There is. After positioning and fixing the magnet 21 in the space in this way, the resin 18a is injected into the space, and then the split molds 22, 23
When the positioning pins 24, 28 are pulled out together with the separation, the molding of the switch lever 18 is completed. Note that when removing the switch lever 18 after molding, the positioning pin 24
is retreating.

On the other hand, the magnet 21 of the switch lever 18
corresponds to the reed switch 30 fixed inside the gear case 6. This reed switch 30
As shown in detail in FIG. 6, the two switch pieces 31a and the lower end of the vertical part of the lead piece 31 are fixed to the printed circuit board 32 by soldering, and the base end 31b of the lead piece 31 is fixed to the printed circuit board 32 by soldering. , 7th
As shown in the drawings and FIG. 8, the lead piece holding portion 33 provided at the bottom 6a of the gear case 6 is fitted and held. That is, the base end 31b of the lead piece 31 is bent into an L-shape and has a hook shape, and is fitted and held in the lead piece holding part 33 and is moved a predetermined distance in the direction of approaching and separating from the magnet 21. The glass tube 34 of the reed switch 30 is positioned in the original position and stopped by the side wall of the hook-shaped reed piece holder 33 in the central axis direction of the glass tube 34 of the reed switch 30. As a result, the relative distance between the reed switch 30 and the magnet 21 is accurately regulated, and as a result, the operating point of the reed switch 30 in response to the magnet 21 is accurately set, and its operation is stabilized. In addition, in a state where the base end 31b of this reed piece 31 is held by the reed piece holding part 33, the glass tube 34 of the reed switch 30 is
is the bottom part 6 of the gear case 6, as shown in FIG.
It has a structure in which it is attached with a gap 35 provided between it and a. This prevents the glass tube 34 from directly hitting the bottom 6a of the gear case 6. Note that the gear case 6
As shown in FIG. 7, the groove portion 36 for the reed switch provided in the reed switch has an entrance 36a formed slightly wider and only the bottom portion narrowed in width to match the diameter of the reed piece 31 of the reed switch 30. There is. The bottom of this groove portion 36 serves as a lead piece holding portion 33 that restricts the movement of the lead piece 31 of the reed switch 30.

The end face cam 17 forms an upwardly inclined end face at a rotation angle of 180 degrees, and forms a downwardly inclined end face at the remaining center angle of 180 degrees, and the spindle 37 is rotated at these end faces. It touches one end. This spindle 37 is for opening and closing the buttful 3, and is supported slidably in the axial direction by a guide tube 38 formed by a part of the gear case 6, and is a part that protrudes to the outside. It is in a state where it can come into contact with the recessed part of Batsuful 3.
Note that the buttful 3 is rotatably supported by a shaft 3a on a bearing portion 2b of the frame 2, and is supported by a leaf spring 39.
is biased in the closing direction.

Effects of the Embodiment Next, the effects of the damper device 1 provided with the positioning structure of the reed switch 30 as described above will be explained.

Assume now that the buffer 3 is in a state where the opening 2a of the frame 2 is closed, as shown in FIG. When a start command signal is given to the motor 4 in this state, the rotational force of the motor 4 is transmitted to the pinion 7, compound gears 8, 9, and gears 10, 11 while being decelerated. In the initial state of rotation, the switch lever 18 is in contact with the upper part of the plate cam 16, and the magnet 21 located on the tip side thereof is brought closer to the reed switch 30, so that the reed switch 30 is set in the on state. However, the plate cam 16
When rotated 180 degrees, the switch lever 18 falls to the bottom of the plate cam 16, and the magnet 21 moves in the direction away from the reed switch 30.
The reed switch 30 is turned off. As a result, the motor 4 immediately stops and becomes locked. Until this motor 4 stops, the end face cam 17 similarly rotates 180 degrees, contacts the spindle 37 from the lower part to the higher part, and
7 to the left in FIG. 1, the buttful 3 resists the leaf spring 39 and is brought into an open state. In this way, the baffle 3 is set to the open state, but when the motor 4 receives the activation command signal again after this, the buffle 3 is set to the closed state.

The magnet 21 and reed switch 30 operate as described above, but due to the manufacturing process of the reed switch 30, the reed piece 31 tends to be misaligned with respect to the center of the glass tube 34. However, according to this embodiment, instead of fixing the glass tube 34, the base end 31b of the reed piece 31 is directly held and fixed by the reed piece holder 33, so that the magnet 21 and the reed switch 30 are In particular, the operating distance from the switch piece 31a is stable, and the above operations can be performed reliably.

Other Embodiments In the embodiments described above, a gap 35 is provided between the glass tube 34 of the reed switch 30 and the bottom 6a of the gear case 6. However, the present invention is not limited to this, and a structure may be adopted in which a soft elastic member is housed within the gap 35. Also, the bottom 6a of the gear case 6 facing the glass tube 34
The part may be hollowed out.

Effects of the Invention As explained above, according to the positioning structure of the reed switch according to the present invention, instead of maintaining the outer diameter of the glass tube of the reed switch, the reed switch reed piece has a stable outer diameter. is held through the reed piece holding part, so the relative distance between the two switch pieces of the reed switch and the magnet can be stabilized.
This makes it possible to stabilize the on/off operating position of the reed switch. Furthermore, since the glass tube of the reed switch is not held, breakage of the glass tube can be prevented.

In particular, the reed piece holder is formed as a hook-shaped groove, and the width narrows at the bottom to match the diameter of the reed piece, so that the reed piece is accurately positioned by the reed piece holder, so the reed switch is accurately positioned at a predetermined distance in the direction of approaching and separating from the magnet. Moreover, since the lead piece holding part is formed as a hook-shaped groove with side walls, the hook-shaped part of the lead piece comes into contact with the side wall of the hook-shaped lead piece holding part, and the glass tube is stopped from moving in the central axis direction. Therefore, in the assembled state of the lead piece, the lead piece is accurately positioned inside the lead piece holding part and is securely fixed.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a damper device that employs the reed switch positioning structure according to the present invention, Fig. 2 is a plan view of the damper device with the base plate of the drive section removed, and Fig. 3 is a switch. Fig. 4 is a partially cutaway front view of the lever, Fig. 4 is a partially cutaway side view of the same switch lever, Fig. 5 is a cross-sectional view when Fig. 3 is cut along the - line, and Fig. 6 shows how the reed switch is installed. FIG. 7 is an enlarged partially cutaway front view, FIG. 7 is a sectional view showing a part of the gear case, and FIG. 8 is an enlarged sectional view showing a part of FIG. 7. 1... Damper device, 6... Gear case, 6a
...Bottom, 21...Magnet, 30...Reed switch, 31...Reed piece, 31a...Switch piece, 33...Reed piece holding part, 34...Glass tube.

Claims (1)

[Scope of utility model registration request] A glass tube part containing two switch pieces,
In the structure for positioning a reed switch on a mounting body, the reed switch has a reed piece that is connected to each of the switch pieces and protrudes from the end of the glass tube part, and the lead piece is bent to form a proximal end of the reed piece. The reed piece holder into which the proximal end of the reed piece is inserted and held is formed in a hook shape with a width that narrows at the bottom to match the diameter of the reed piece, and this reed piece holder is used to attach the reed switch. A positioning structure for a lead chain, characterized by having a regulating part that regulates the position.