JPS62165819A - Limit switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a limit switch device useful for constructing an electric opening/closing mechanism such as an electric shutter, particularly a small and lightweight shutter for a window shutter.

[Prior Art] Recently, the opening and closing of many shutters for doors and windows in buildings has been motorized, allowing residents to easily open and close the shutters by simply pressing a switch button. It's starting to look like this.

For this reason, this type of shutter opening/closing mechanism is equipped with an upper limit switch and a lower limit switch, and when the shutter is closed (or opened), the shutter is lowered and fully closed ( Alternatively, the lowering (or raising) of the shutter is automatically stopped when the shutter is raised or fully opened.

By the way, in the conventional configuration of this type of limit switch device, especially the lower limit device used for electric shutters, the limit switch is installed in the lintel part of the shutter case, and is also installed at an appropriate location near the hanging base of the curtain. When assembling the shutter by attaching a limit plate to the slat, sometimes when the draining part of the curtain is lowered to the bottom of the doorway or window frame, the limit plate hits the limit switch and drives the shutter. Adjustments are being made to stop the motor.

[Problems to be solved by the invention] However, according to such a conventional lower limit device,
When the shutter is opened and closed, there is a problem in that the slat curtain tends to cause vertical vibration due to the vertical movement due to the following reason. In other words, for example, if the torque adjustment of the take-up spring or the position adjustment of the limit plate is insufficient, or if the curled part of the slat stretches due to repeated use, the slat and the take-up spring may not be aligned when the slant curtain is closed. The winding torque becomes unbalanced, and the slat naturally tends to rise, or the slat jumps up from the lowest position and is energized again to the descending side, which causes the slat to move up and down repeatedly. easy.

In order to prevent such problems, some carbon brakes are used, but the braking force varies, so they are not practical, and although it is possible to use a brake motor, it is necessary to manually open and close it during a power outage. There was a point where it was impossible to do so and it became expensive.

Therefore, in the past, there was a problem in that the limit device had to be disassembled and the assembly readjusted every time a vertical vibration phenomenon occurred.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a limit switch device that automatically absorbs these malfunctions and prevents vertical vibration phenomena even when changes in various parts occur over time or fluctuations in adjustment occur. There is.

[Means for Solving the Problems] Next, the present invention will be explained based on the drawings corresponding to the first embodiment shown in FIGS. 1 to 10.

The limit switch device of the present invention includes a limit lever that is pushed and operated by an external force, a spring means that returns the limit lever, a switch activation lever that pushes and operates an actuator of the switch, and a reciprocating direction of the switch activation lever. Front and rear engagement means provided at the front and rear parts of the
an engaged means provided on the limit lever and selectively engages the front and rear engaging means with a predetermined delay width during reciprocating movement of the limit lever; and the switch activation lever pushes an actuator of the switch. The present invention is characterized by comprising a locking means for releasably locking the switch activation lever at the operated position.

[Function] As described above, according to the present invention, the amount of puncture crunch based on the distance between the front and rear engagement means 10a and 10b is provided in the transmission of the operation movement force between the two levers that actuate the limit switch. Therefore, even if the limit lever deviates slightly from the position where it is pushed by a moving object such as a slat curtain, the switch activation lever will not move due to the backlash effect.
It is held as FF, and therefore, vertical vibration of the curtain does not occur.

[Embodiments] Hereinafter, the structure of the present invention will be specifically described based on two illustrated embodiments.

~(First embodiment)...See FIGS. 1 to 10.

The limit switch device of this embodiment includes a limit switch 3 installed on a lintel 2 suspended horizontally in a shutter case l, and a slat located at a location near the suspension base (not shown) of a wheel 4. 5 and a limit abutment plate 6 as a limit abutment member that extends horizontally.

By the way, first of all, the limit switch 3 is a box-shaped case 7.
is the main body, and the main body includes a micro switch 8,
A limit lever /<-9 and a switch activation lever 10 are assembled.

However, the lever case 7 is formed into a box shape by a front plate 7a, a rear plate 7b, a bottom plate 7c, a top plate 7d, a left side plate 7e, and a right side plate 7f. The holes are drilled as follows.

Rear plate 7b...screw hole for attaching microsinch 8 (
2 locations), and a through hole 7g to which the rotary receiving shaft 11 (described later) is attached.

Bottom plate 7C...Ribben) 12 (described later) through hole.

Left side plate 7e... escape window 7g for limit lever 9
, a through hole 7h for the torque spring 13 (described later).

Right side plate 7f... Through-hole 7rm of switch lead 14 (described later) Next, the microswitch 8 having the actuating piece 8a is screwed to the rear plate 7b with two mounting screws 15, and the switch lead 14 (described later) is screwed to the rear plate 7b. 14, and the one-turn bearing shaft 11 is riveted to the rear plate 7b via a washer 17, and a click spring piece is formed on the inner surface of the bottom plate 7C. The locking means 16 is a rivet 12
Fixed by

Therefore, the switch activation lever 10 is attached to the rotary receiving shaft 11.
and limit lever 9 are pivotally connected to each other so as to be movable back and forth by loose fitting, and one switch actuating lever 10
, front and rear engagement means 10a each having a bent piece shape are provided at the front and rear edges in the reciprocating direction.

10b is formed, and the lower right corner is tapered in a V shape to form a locking edge 10c.

The other limit lever 9 has a lever plate 9a, an angle arm 9b, and a spring piece 9C integrally molded, and the lever plate 9a has a fan-shaped shape in the center. The outer edge of the limit lever 9, where the elongated hole 9d is spaced between characters, and which faces the inner edge of the elongated hole 9d in the moving direction, is a front and rear engaging means 9e.

It forms 9f.

Note that when the switch activation lever 10 is assembled to the rotary receiving shaft 11, the engaging means lOb is then in contact with the actuator 8a of the microswitch 8, and the limit lever 9 passes through the escape window 7g. When the limit device-9 is assembled to the rotary receiving shaft 11, the front engaging means 10a of the switch actuating lever 10 is fitted and engaged in the elongated hole 9d. As shown in the figure, the spring means 13 is biased to swing clockwise in the drawing.

That is, the spring means 13 as a torque spring wound around the one-rotation receiving shaft 11 has its fixed end hooked into the through hole 7h of the left side plate 7e, and its movable end. , the spring hook of the limit lever 9 is hooked on the groove of the piece 9C.

The limit switch 3 of the embodiment configured in this way is as follows:
The angle arm 9b is brought into contact with the lower part of the limit plate 6 of the slat 5.The operation of the limit device of this embodiment will be explained below with reference to FIGS. 10(a) to 10(c).

First, the operation of the microswitch 8 is OFF (
In the state shown in FIG. 10(a), it allows the shutter to be energized in a downward direction, and in the ON state (FIGS. 10(a) and (c)), it functions to cut off the downward energization. In addition, the elasticity of the locking means 16 made of a push spring piece is much smaller than the force i of the spring means 13.

First, when the shutter is open, that is, when the angle arm 9b is free (FIG. 10(a)), the limit lever 9 is fully swung clockwise by the elastic force of the moving means 13. The microswitch 8 is therefore in the OFF position.

Next, when the lowering operation button is pressed to close the shutter, the slats are energized and lowered freely, and when they reach the lower limit position n, as shown in Fig. 1O (b), The angle arm 9b is pressed fully downward by the limit plate 6, and the microswitch 8 is turned on, thereby stopping the shutter from lowering.

By the way, in such a shutter closed state, if the position of the limit plate 6 deviates from the lowest position shown in FIG. 10(b) to the upper position due to some malfunction (as described above), the angle arm 9b Because it becomes free,
The limit lever 9 swings back clockwise due to its elasticity, but in the middle of this movement, the front engagement means 10a of the switch activation lever 10 is inserted into the long hole 9d of the limit lever 9, as shown in FIG. 10(C). Since the tip of the locking means 16 is held in place until it hits the front engaging means 9e on the rear edge, only the limit lever 9 swings and the switch activation lever 10 is in the ON position. The rest, the switches, are in the HOLD-ON state.

As a result, during this HOLD-ON, the microswitch 8 shuts off the current supply, thereby preventing the occurrence of vertical vibration phenomena and the like.

However, when the limit lever 9 swings back beyond the above-mentioned HOLD-ON state, since the click elasticity of the locking means 16 is weak, the accompanying movement via the front engagement means 10a due to the return elasticity of the spring means 13 causes , the click action of the locking means 16 is released, resulting in the original ON state shown in FIG. 10(a).

Therefore, the swing angle of the limit lever 9 during OLD-ON is considered as the amount of backlash, and normally,
If this amount of backlash is made to correspond to the vertical movement of the slat pitch by one pitch, it is possible to accurately adjust the mounting position of the limit plate 6.

In the above configuration, the engaged means 9e and 9f are 2
There is no problem even if it is formed by one or one protruding piece.
In this case, the engaging means 10a, 10b may be formed at opposing inner edges of the elongated hole.

(Second embodiment)...See FIG. 11.

In the configuration of this embodiment, the passive part from the limit plate 6 is replaced with the above-mentioned limit lever 9, and is supported by a lifting rod 18 vertically suspended in the switch case and a rotary receiving shaft 11 similar to the above. The other functional structure is the same as that of the first embodiment described above. That is, the operating force from the limit abutment plate 6 transmitted to the lifting rod 18 which is biased upward by the spring means 20 made of a compression coil spring is applied to the limit lever 19 via the abutment flange 19a.
After being transmitted to the rear engaging means 19f facing the front engaging means 19e at the rear edge of the elongated hole 19b of the limit lever 19 and the front engaging means 21a in the shape of a cut-out tongue of the switch activation lever z1. Through engagement with the opposing rear engaging means 21b, the click force is transmitted to the activation lever 21 which is click-biased by the click locking means 22, thereby operating the microswitch 8.

In the switch device of the embodiment configured as described above, since there is no risk of vertical vibration occurring in the slat curtain due to vertical movement, there is no need for limit adjustment, which improves the workability of the shutter. Since the structure and electric circuit of the opening/closing mechanism are simple, failures are less likely to occur, and costs can be reduced, making it possible to adapt to smaller shutters.

[Effects of the Invention] As described above, according to the limit switch device according to the present invention, since the limit switch for limit operation is configured to have a predetermined amount of backlash, In addition to being able to prevent vibration phenomena in electric moving objects such as slat curtains, it is also possible to respond to limit position fluctuations, making it easier to install and maintain moving objects, and making it possible to downsize the device. This has the effect of improving the reliability, usability, and practicality of electric vehicles.

[Brief explanation of drawings]

FIG. 1 is an external view of the limit switch Ij< position according to the embodiment of the present invention, FIG. 2 is a front view of the limit switch device according to the first embodiment of the present invention, and FIG. 4 is a left side view of the same, FIG. 5 is a radial side view of the same, FIG. 6 is a right side view of the same, and FIG. 7 is a front sectional view taken along the line ■-■ of FIG. 3. , FIG. 8 is a side sectional view taken along line ■-Wi in FIG. 7, FIG. 9 is an exploded perspective view of FIG. 7, and FIG. 10 (
a) to FIG. 10(c) are operational diagrams of FIG. 7, and FIG. 11 is a front sectional view of the dynamic switch device showing the second embodiment, which corresponds to FIG. 7. . 8a... Actuator, 9, 19... Limit lever, 9e, 9f... Engaged means, 13.20...
Spring means, 10.21...Switch activation lever, 10
a, l Ob, 21 a, 2 l b-・
- Engagement means, 16°22...locking means. Figure 1 Figure 5 1'27c Figure 6 Figure 10 (0) Figure 10 (b) Figure 10 (c)

Claims (1)

[Claims] A limit lever that is pushed and operated by an external force, a spring means that returns the limit lever, a switch activation lever that pushes and operates an actuator of the switch, and provided at the front and rear of the switch activation lever in the reciprocating direction. a front and rear engaging means, an engaged means provided on the limit lever and selectively engaging the front and rear engaging means with a predetermined delay width during reciprocating movement of the limit lever; A limit switch device comprising a locking means for releasably locking the switch activation lever at a position where an actuator of the switch is pressed.