JP3820047B2 - switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a switch.
[0002]
[Prior art]
Conventionally, a switch called a pull switch has been used in a lighting fixture or the like. In this type of switch, a switch mechanism is housed inside a switch body made of an insulating material. The switch mechanism has a drive handle rotatably attached to the case. A pull string is attached to the end of the drive handle. By pulling the pull string, the drive handle rotates, and the drive handle The contact is turned on / off according to the rotation (see, for example, Japanese Utility Model Publication No. 56-15539).
[0003]
As shown in FIG. 7, the drive handle 13 is formed in a substantially flat plate shape from a conductive material, and is attached to the switch body so as to be rotatable about the rotary shaft 10. The end of the drive handle 13 is provided with a string passing hole 31 through which the pull string 21 is passed, the leading end of the pull string 21 is passed through the string passing hole 31, and the leading end of the pull string 21 is larger than the string passing hole 31. By making 22, the drawstring 21 was attached to the drive handle 13. The switch body is provided with a pair of fixed contacts 24, and a movable contact (not shown) is provided at a portion of the drive handle 13 that faces the fixed contact 24, and the drive handle 13 is used for pulling the pull string 21. When it rotates correspondingly, the fixed contact 24 and the movable contact come into contact with and away from each other. A contact pressure between the fixed contact 24 and the movable contact is applied by a return spring 23 that biases the drive handle 13 toward the return position.
[0004]
[Problems to be solved by the invention]
In the switch having the above configuration, the pull string 21 is attached to the drive handle 13 by passing the pull string 21 through the string passing hole 31 of the drive handle 13 and making a knot 22 at the tip of the pull string 21. There was a problem of being bad. Moreover, when pulling the drawstring 21, a force is directly applied to the knot 22 provided on the drawstring 21, so that the knot 22 is easy to unwind, and the knot 22 is doubled to prevent the knot 22 from being unraveled, Since an adhesive was applied, there was a problem that assembly workability was poor.
[0005]
Further, as shown in FIG. 8, the switch body has a pair of fixed contacts 24 and a pair of movable contacts 32 that come into contact with and separate from each fixed contact 24. A movable contact piece 33 attached so as to be rotatable in one direction; a drive handle 13 which is attached to the rotary shaft 10 so as to be rotatable, and engages the movable contact piece 33 in a ratchet manner to rotate the movable contact piece 32 in one direction; A return spring 23 that urges the drive handle 13 toward the return position, and a metal pull ring 34 that has one end hooked and locked to the drive handle 13 and a pull string (not shown) attached to the other end. The drive handle 13 rotates according to the pulling operation of the pulling string, the movable contact piece 33 rotates in one direction according to the rotation of the drive handle 13, and the fixed contact 24 and the movable contact 32 While but some of which were adapted to separable freely contact, large number of components, there is a problem that it is troublesome assembly.
[0006]
Furthermore, in the former switch, in order to prevent the drawstring 21 from being caught by the contact portion, it is necessary to attach the drawstring 21 to the drive handle 13 away from the contact portion in the plane direction of the drive handle 13, and the switch is downsized. There was a problem that it was difficult. Further, in the latter switch, in order to secure an insulation distance between the contact portion and the pulling wheel 34, it is necessary to attach the pulling wheel 34 to the drive handle 13 away from the contact portion in the plane direction of the drive handle 13, There was a problem that it was difficult to downsize.
[0007]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a switch that improves assembly workability and is miniaturized.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a fixed contact provided in the switch body, a drive handle rotatably provided on the switch body, one end attached to the drive handle and the other end A pull cord that is pulled out of the switch body and rotates the drive handle in response to a pulling operation, and a movable contact that is provided on the drive handle and that comes in contact with and away from the fixed contact in accordance with the rotation of the drive handle. The drive handle includes a substantially L-shaped pull string fixing piece formed by bending one end of the drive handle to the side opposite to the fixed contact, and the pull string fixing piece is more bent than the tip of the pull string fixing piece. It has a narrow neck and a notch at the tip, and the drawstring locks the catch provided on the one end to the notch and is fixed to the drawstring. And characterized in that the wound site, together with the engaging the locking portion in the notch, when winding the cord pulling to the site of drawstring fixing tabs provided is constricted portion, the constricted portion drawstring Because it is hooked and locked, it can be attached to the drive handle just by wrapping the drawstring around the drawstring fixing piece, and there is no work to pass the drawstring through the hole like conventional switches, improving the workability of assembly work To do. Moreover, the pulling string is pulled by the constricted part, so it is difficult for the pulling string to come off, and there is no need to double-knot the pull string or apply adhesive to the knot unlike conventional switches. Workability is improved. Furthermore, a substantially L-shaped pull string fixing piece projects from one end of the drive handle, and the leading end of the pull string fixing piece protrudes in a direction intersecting the plane direction of the drive handle. The drive handle can be reduced in size by reducing the size of the handle, and a constricted portion for winding the drawstring around the bent portion of the drawstring fixing piece is provided. Can be small. In addition, the pull string is wound around the bent portion of the pull string fixing piece, and the bent portion of the pull string fixing piece has a high bending strength, so that it is possible to prevent the drive handle from being deformed by the force applied to the pull string. Further, since the pull string fixing piece is formed by bending one end of the drive handle to the side opposite to the fixed contact, the pull string wound around the pull string fixing piece does not get caught on the contact portion, and therefore the drive handle. The distance between the drawstring and the contact portion in the plane direction can be shortened, and the switch can be miniaturized.
[0010]
Further, in the invention of claim 1, as well as hold the drawstring between the drive moving the handle, characterized in that the drive handle is provided with a return spring which gives a return force to the drive wheel back to the return position, Since the pull string is held between the drive handle and the return spring, it is possible to prevent the pull string from coming off.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 2 to 5, the switch body of this switch includes a substantially box-shaped body 1 having a housing recess 3 for housing a contact portion described later, and an opening of the housing recess 3. The cover 1 is attached to the body 1 so as to close the cover, and the body 1 and the cover 2 are each made of an insulating material.
[0012]
The front surface of the cover 2 is formed in a substantially rectangular shape, and a pair of locking claw pieces 4 and 5 projecting backward are projected from one end and an intermediate portion of both sides in the short width direction of the cover 2. Yes. A claw 4a projecting inwardly protrudes from the tip of the locking claw piece 4 provided at one end of both sides, and the outside of the tip of the locking claw piece 5 provided at the middle part of both sides. A claw 5a that protrudes from the front is projected. On the other hand, a portion of the outer peripheral surface of the body 1 corresponding to the locking claw piece 4 is provided with a locking groove 6 for locking with the claw 4a, and a portion corresponding to the locking claw piece 5 is locked with the claw 5a. A locking hole 7 is provided, and the claw 4 a of the locking claw piece 4 is locked to the locking groove 6, and the claw 5 a of the locking claw piece 5 is locked to the locking hole 7. 1 and the cover 2 are combined.
[0013]
A boss 8 protrudes from substantially the center of the inner bottom surface of the storage recess 3, and a step seat 9 having step portions at predetermined angles is provided on the upper surface of the boss 8. A boss hole 8a is opened at the center of the stepped seat 9, and one end of the rotating shaft 10 is inserted into the boss hole 8a. A receiving seat 11 that supports the other end of the rotating shaft 10 is provided on the inner surface of the cover 2. When the cover 2 is attached to the body 1 with the rotating shaft 10 inserted into the boss hole 8 a, The rotating shaft 10 is held between the cover 2 and the cover 2.
[0014]
A drive handle 13 is rotatably attached to the rotary shaft 10 via a step wheel 12. The drive handle 13 is formed of a conductive material, and has a substantially disc-shaped rotation plate 14 with a hole 14a into which the rotation shaft 10 is inserted. A pair of movable contact pieces 15 are continuously provided integrally with the rotating plate 14 from diagonal parts across the hole 14a, and each movable contact piece 15 is in contact with a fixed contact 24, which will be described later, so as to come into contact with and move away from each other. 16 is provided. Further, a fixed piece 17 protruding in a direction substantially orthogonal to the plane direction of the drive handle 13 is provided continuously from one end of the movable contact piece 15. A constricted portion 18 having a narrow width is also provided. A pair of substantially L-shaped hooking pieces 19 are provided at the distal end portion of the fixed piece 17 so that the distal end portions are opposed to each other, and a substantially T-shaped notch portion 20 is provided between the pair of hooking pieces 19. Provided. The rotating plate 14 is provided with eight openings 14b on the circumference around the hole 14a at intervals of about 45 degrees. Here, a substantially L-shaped drawstring fixing piece is constituted by the movable contact piece 15 and the fixing piece 17 provided with the fixing piece 17 at the end. A contact portion is constituted by the drive handle 13, the movable contact 16, the fixed contact 24, and the like.
[0015]
On the other hand, a hole 12a through which the rotary shaft 10 is inserted is formed in the center of the step wheel 12, and four contact pieces 12b protruding in the circumferential direction are provided at intervals of about 90 degrees. At the end edges of the pair of contact pieces 12b located diagonally across the hole 12a, a claw (not shown) that engages with the stepped portion of the stepped seat 9 raises the end toward the stepped seat 9 side. A claw (not shown) that engages with the opening 14b of the drive handle 13 is formed at the edge of the other pair of contact pieces 12b by raising the edge toward the drive handle 13 side. .
[0016]
Here, the drive handle 13 is pivotally attached to the rotary shaft 10 via the step wheel 12 with the fixed piece 17 facing the left side in FIG. Then, as shown in FIG. 1, after the knot 22 provided at one end of the drawstring 21 is locked to the notch 20, the drawstring 21 is wound around the portion of the fixed piece 17 where the constricted portion 18 is provided. As a result, the pull string 21 is attached to the drive handle 13. The drawstring 21 is pulled out from a notch groove 27 provided in the body 1. An operation unit 28 is attached to the other end portion of the pull string 21, and the drive handle 13 is rotated by performing a pulling operation of the pull string 21 using the operation unit 28. In the present embodiment, the shape of the cutout portion 20 is formed in a substantially T shape. However, the shape of the cutout portion 20 is not intended to be limited to a substantially T shape, and the knot 22 of the drawstring 21 is not intended. May be formed in a substantially L shape.
[0017]
Thus, the substantially L-shaped pulling string fixing piece protrudes from one end of the driving handle 13, and the tip of the fixing piece 17 protrudes in a direction substantially perpendicular to the plane direction of the driving handle 13. Since the constricted portion 18 is provided in the bent portion 17, when the drawstring 21 is wound around the portion of the fixed piece 17 where the constricted portion 18 is provided, the drawstring 21 is hooked and locked to the constricted portion 18 and pulled out. Since the stopping is performed, the pulling string 21 can be attached to the drive handle 13 only by winding the pulling string 21 around the fixed piece 17, and the workability of the assembling work is improved. Moreover, since the force applied to the drawstring 21 when the drawstring 21 is pulled is received by the fixed piece 17, no force is directly applied to the knot 22 of the drawstring 21, and in order to prevent the knot 22 from being unwound. Since it is not necessary to fix the knot 22 by doubling the knot 22 or applying an adhesive or the like to the knot 22, the workability of the assembly work is improved. Further, the pull string 21 is wound around the bent portion of the pull string fixing piece, that is, the base of the fixed piece 17, and the base of the fixed piece 17 has a large bending strength, so that the driving handle 13 is deformed by the pulling force of the pull string 21. Never do. Moreover, since the pull string 21 is wound around the base of the fixed piece 17, the protruding amount of the fixed piece 17 in the direction substantially orthogonal to the plane direction of the drive handle 13 can be reduced. Further, since the fixed piece 17 is formed by bending the edge of the movable contact piece 15 to the side opposite to the fixed contact 24, the pull cord 21 wound around the fixed piece 17 is not caught by the contact portion, and therefore The distance between the pull string 21 and the contact portion in the plane direction of the drive handle 13 can be shortened, and the switch can be miniaturized.
[0018]
Here, the drive handle 13 is urged clockwise in FIG. 2 around the rotary shaft 10 by a return spring 23 made of a coil spring, and a fixed piece 17 is provided in a state where the pull cord 21 is not pulled. The drive handle 13 is inclined so that the movable contact piece 15 on the side is on the upper side in FIG. Since the fixed contact 24 is disposed in the storage recess 3 at a position where it is in electrical contact with the movable contact 16 provided on the drive handle 13 in a state where the pull string 21 is not pulled, the pull string 21 is When not pulled, the fixed contact 24 and the movable contact 16 are in electrical contact, and the pair of fixed contacts 24, 24 are electrically connected via the drive handle 13. In addition, a conductive plate 26 having a conductive spring 25 slidably contacting the surface of the drive handle 13 is disposed in the housing recess 3 of the body 1, and the conductive plate 26 is connected to each fixed contact 24 via the drive handle 13. Electrically connected. Each fixed contact 24 is electrically connected to a terminal portion (not shown) formed of a so-called quick connection terminal, and an electric wire for inserting an electric wire connected to the terminal portion from the outside to the side wall of the body 1. An insertion hole 29 and a tool insertion hole 30 for releasing a connection state between the electric wire and the terminal portion by inserting a tool such as a minus driver are provided.
[0019]
When the pulling cord 21 is pulled and the drive handle 13 is rotated counterclockwise in FIG. 2 against the spring force of the return spring 23, the movable contact 16 and the fixed contact 24 are separated, and the fixed contacts 24, 24 are separated. And between the conductive plate 26 and each fixed contact 24 become non-conductive. By the way, when the drive handle 13 rotates counterclockwise in FIG. 2, the claw piece provided on the contact piece 12 b of the step wheel 12 is engaged with the opening 14 b of the drive handle 13, thereby causing the step wheel 12 to move to the drive handle 13. When the claw pieces provided on the contact piece 12b of the corrugated carriage 12 get over the step portion of the step seat 9, a click feeling is generated.
[0020]
Thereafter, when the pull string 21 is released, the drive handle 13 is rotated clockwise in FIG. 2 by the return force of the return spring 23 to return to the original position, and the movable contact 16 and the fixed contact 24 are in electrical contact, Between the two fixed contacts 24, 24 and between the conductive plate 26 and the fixed contact 24 are brought into conduction. Since the opening 14b of the drive handle 13 slides on the contact piece 12b of the carriage 12 and returns to the original position, the carriage 12 does not rotate.
[0021]
By the way, as shown in FIG. 6, one end of the return spring 23 is engaged with the notch 20, and the pull string 21 wound around the fixed piece 17 is sandwiched between the drive handle 13 and the return spring 23. It is also possible to prevent the drawstring 21 from coming off.
[0022]
【The invention's effect】
As described above, according to the first aspect of the present invention, the fixed contact provided in the switch body, the drive handle provided rotatably in the switch body, one end portion is attached to the drive handle, and the other end portion is the switch. comprising a drawstring rotating the drive wheel in response to being led out of the body pulling operation, a movable contact fixed contacts and separable freely contact according to the rotation of the provided drive wheel to the drive wheel, the drive The handle includes a substantially L-shaped pull string fixing piece formed by bending one end of the drive handle to the opposite side of the fixed contact, and the pull string fixing piece is narrower than the tip of the pull string fixing piece at the bent portion. It has a constricted portion and a notch portion at the tip, and the drawstring engages the notch portion with the engaging portion provided at the one end, and at the portion of the drawstring fixing piece provided with the constricted portion. roll Characterized in that attached, together with the engaging the locking portion in the notch, when winding the cord pulling to the site of drawstring fixing tabs provided is constricted portion, engaging hooked to the constricted portion drawstring locking Therefore, it can be attached to the drive handle just by wrapping the drawstring around the drawstring fixing piece, and there is no work to pass the drawstring through the hole like conventional switches, so the workability of assembly work is improved There is. Moreover, the pulling string is pulled by the constricted part, so it is difficult for the pulling string to come off, and there is no need to double-knot the pull string or apply adhesive to the knot unlike conventional switches. There is an effect that workability is improved. Furthermore, a substantially L-shaped pull string fixing piece projects from one end of the drive handle, and the leading end of the pull string fixing piece protrudes in a direction intersecting the plane direction of the drive handle. The drive handle can be reduced in size by reducing the size of the handle, and a constricted portion for winding the drawstring around the bent portion of the drawstring fixing piece is provided. There is an effect that it can be reduced. In addition, the drawstring is wound around the bent portion of the drawstring fixing piece, and the bent portion of the drawstring fixing piece has a high bending strength, so that the drive handle can be prevented from being deformed by the force applied to the drawstring. There is. Further, since the pull string fixing piece is formed by bending one end of the drive handle to the side opposite to the fixed contact, the pull string wound around the pull string fixing piece does not get caught on the contact portion, and therefore the drive handle. In this plane direction, the distance between the drawstring and the contact portion can be shortened, and the switch can be miniaturized.
[0024]
The invention of claim 1 is adapted to hold the drawstring between the drive moving the handle, characterized in that the drive handle is provided with a return spring which gives a return force to the drive wheel back to the return position, Since the pull string is held between the drive handle and the return spring, there is an effect that the pull string can be prevented from coming off.
[Brief description of the drawings]
FIGS. 1A and 1B are explanatory views showing an attached state of a pull cord of a switch according to the present embodiment.
FIG. 2 is an exploded perspective view showing the switch.
FIG. 3 is a sectional view showing the switch.
FIG. 4 is an external perspective view of the above switch as viewed from the front side.
FIG. 5 is an external perspective view of the same switch as viewed from the back side.
FIG. 6 is an explanatory view showing another attachment state of the drawstring used for the switch described above.
FIG. 7 is an explanatory view showing an attached state of a pull cord of a conventional switch.
FIG. 8 is an explanatory view showing another attachment state of the pull cord of the switch.
[Explanation of symbols]
13 Drive handle 14 Rotating plate 14a Hole 15 Movable contact piece 17 Fixed piece 18 Neck part 20 Notch part 21 Pull string 22 Knot

Claims (1)

A fixed contact provided on the switch body, a drive handle rotatably provided on the switch body, and one end attached to the drive handle and the other end pulled out of the switch body and driven in accordance with a pulling operation The pulling string that rotates the handle, the movable contact that is provided on the driving handle and that comes into contact with and separates from the fixed contact according to the rotation of the driving handle, and the driving handle is held between the pulling string and the driving handle. A return spring that applies a return force to the drive handle so that the handle returns to the return position, and the drive handle has a substantially L-shaped pulling cord fixing piece formed by bending one end of the drive handle to the side opposite to the fixed contact. The pull string fixing piece includes a constricted portion having a narrower width than the tip of the pull string fixing piece at the bent portion and a notch at the tip, and the pull string is provided at the one end. Switch, characterized in that causes locked to notch a locking portion, the constricted portion is wound at the site of drawstring fixing tabs provided with.

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