JPH0369130B2 - - Google Patents

Description

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

[Prior Art] Recently, the opening and closing of many shutters for doorways and windows in buildings has been motorized.
Residents are now able to easily open and close shutters by simply pressing a switch button.

For this reason, the opening/closing mechanism of this type of shutter is equipped with an upper limit switch and a lower limit switch, so that when the shutter is closed (or opened), the shutter is lowered, fully closed (or The lowering (or raising) of the shutter automatically stops 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
Attach a limit plate to a slat at an appropriate location near the hanging base of the curtain, and when assembling the shutter, when the drain part of the curtain is lowered to the bottom of the doorway or window frame, the limit plate will activate the limit switch. Adjustments are being made to stop the shutter drive motor at this time.

[Problems to be Solved by the Invention] However, according to such a conventional lower limit device, the slat curtain is likely to cause vertical vibration due to the vertical movement when the shutter is opened/closed for the following reasons. There is a problem. 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 years of use, the slat and the take-up spring may become loose when the slat curtain is closed. The winding torque becomes unbalanced, and the slat naturally tends to rise, or it jumps up from the lowest position and is energized again on the descending side, which causes the slat to move up and down repeatedly. easy.

Some brakes use carbon brakes to prevent such problems, but they are not practical due to variations in braking force, and although a brake motor can be used, manual opening and closing during power outages is not possible. There was a problem that it could not be done and was 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.

Therefore, an object of the present invention is 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. .

[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 micro switch 8 and a flat plate-shaped switch activation lever 10 rotatably provided on a rotary receiving shaft 11 provided near the micro switch 8. A switch activation lever 10, a part of which presses and activates the actuation piece 8a of the micro switch 8.
and a flat plate-shaped limit lever 9 which is rotatably provided on the rotary receiving shaft 11 and overlapping with the switch activation lever 10,
Limit lever 9 that is pushed and operated by external force
a spring means 13 for resiliently returning the limit lever 9; an elongated hole 9d formed in one of the overlapping plate surfaces of the switch activation lever 10 and the limit lever 9; and a long hole 9d in the other plate surface. and an engaging means 10a formed of a protruding piece that protrudes into the elongated hole 9d and can come into contact with the inner edge of the elongated hole 9d. or when the limit lever 9 is pushed against the spring means 1.
3, when the engaging means 10a slides in the elongated hole 9d, the switch actuating lever 10 is moved.

[Operation] In the above configuration, from the return position shown in FIG.
When the limit lever 9 is pushed and operated by external force,
The limit lever 9 rotates about the rotary receiving shaft 11 against the elasticity of the spring means 13. At this time, the elongated hole 9d also rotates, but the switch activation lever 10 does not move because the engaging means 10a, which is in a fixed position, slides within the elongated hole 9d. When the limit lever 9 rotates further, the limit lever 9 pushes the switch activation lever 10, thereby activating the micro switch 8. In this operating position, when the external force on the limit lever 9 is released, the limit lever 9 returns to its original position by the spring means 13, but until halfway through its return, the elongated hole 9d slides relative to the engaging means 10a. Then, the switch activation lever 10 is left in the same position. When the limit lever 9 returns further, the inner edge of the elongated hole 9d of the limit lever 9 comes into contact with the engagement means 10a, and together with the engagement means 10a, the switch activation lever 10 is moved, and the push of the actuation piece 8a of the micro switch 8 is released. do.

[Examples] Hereinafter, the configuration 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 1, and a limit switch 3 installed on a slat 5 near a suspension base (not shown) of a wheel 4 and placed horizontally. It is formed by a limit abutment plate 6 as a limit abutment member that extends from the bottom.

By the way, first of all, the limit switch 3 has a box-shaped case 7 as a main body, and a micro switch 8, a limit lever 9, and a switch activation lever 10 are assembled to the main body.

However, the lever case 7 has a front plate 7a and a rear plate 7.
b, a bottom plate 7c, a top plate 7d, a left side plate 7e,
The right side plate 7f is formed into a box shape, and each plate has holes as shown below.

Rear plate 7b...Threaded holes (two locations) for attaching the micro switch 8, and through hole 7g for attaching the rotary receiving shaft 11 (described later).

Bottom plate 7c...through hole for rivet 12 (described later).

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

Right side plate 7f...through window 7i of switch lead 14 (described later).

Next, the micro switch 8 having the actuating piece 8a
is screwed to the rear plate 7b with two mounting screws 15 and electrically connected to the switch lead 14, and the rotating shaft 11 is riveted to the rear plate 7b via washers 17. At the same time, on the inner surface of the bottom plate 7c, a locking means 16 formed by a push spring piece for click is fixed by a rivet 12.

Both the switch actuation lever 10 and the limit lever 9 are loosely fitted to the rotary receiving shaft 11 so as to be movable back and forth. , front and rear engagement means 10a and 1 each have a bent piece shape.
0b is formed, and the lower right corner is tapered into a V-shape to form a locking edge 10c.

Further, the other limit lever 9 is connected to a lever plate 9.
a, an angle arm 9b, and a spring hook 9c are integrally molded, and a fan-shaped elongated hole 9d is bored in the center of the lever plate 9a, and the elongated hole 9d The outer edge of the limit lever 9, which faces the inner edge in the moving direction of the front and rear engaging means 9e,
It forms 9f.

In addition, in the state in which this switch starting lever 10 is assembled to the rotary receiving shaft 11, the engaging means 1 is then
0b is the actuator 8a of the micro switch 8
When the limit lever 9 passes through the relief window 7g and is assembled to the rotating shaft 11, the front engagement means 10a of the switch activation lever 10 fits into the elongated hole 9d. In addition, the limit lever 9 is urged to swing clockwise in the drawing by the elasticity of the spring means 13, as described below.

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

The limit switch 3 of the embodiment configured in this way has its angle arm 9b connected to the slat 5.
The limit plate 6 is placed in opposition to the lower part of the limit plate 6, and below, regarding the operation of the limit device of the embodiment, the 10th limit plate 6 is
This will be explained with reference to Figures a to c.

First, the operation of the micro switch 8 is as follows.
In the OFF state (Fig. 10a), the shutter is allowed to energize downward, and in the ON state (Fig. 10b, c)
In this state, the downward energization is interrupted. In addition, the elasticity of the locking means 16 made of a push spring piece is much smaller than that of the spring means 13.

First, when the shutter is open, that is, the angle arm 9b is free (Fig. 10a),
The limit lever 9 is in the position where it is fully swung clockwise due to the elastic force of the spring means 13, and the micro switch 8 is therefore turned off.

Next, when you press the lowering operation button to close the shutter, the slats are energized to lower freely and lowered, and then when they reach the lower limit position,
As shown in FIG. 10b, the angle arm 9b is pushed fully downward by the limit abutting plate 6, and the micro switch 8 is turned on, thereby stopping the lowering of the shutter.

By the way, in such a closed state of the shutter, if the position of the limit plate 6 deviates from the lowest position shown in FIG. 10b to the upper position due to some malfunction (as described above), the angle arm 9b
Since the limit lever 9 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 actuation lever 10 engages the limit lever 9, as shown in FIG. 10c. Until the rear edge of the elongated hole 9d hits the front engaging means 9e, the tip of the locking means 16 is clicked and held, so only the limit lever 9 swings and the switch activation lever 10 is turned ON. The switch remains in the HOLD-ON state.

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

However, if the limit lever 9 returns and swings beyond the above-mentioned HOLD-ON state, the locking means 16
Since the click elasticity is weak, the click action of the locking means 16 is disengaged due to the accompanying movement via the front engagement means 10a due to the return elasticity of the spring means 13, and as a result, the original ON state shown in FIG. 10a is released. The state will be as follows.

Therefore, the swing angle of the limit lever 9 during this HOLD-ON is regarded as the amount of backlash,
Normally, if the amount of backlash corresponds to the amount of vertical movement of the slat pitch by one pitch, it is possible to accurately adjust the mounting position of the limit contact plate 6.

Note that in the above configuration, the engaged means 9e, 9f
may be formed by two or one projecting piece, and 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 the lifting rod 18 vertically suspended inside the switch case is replaced with the above-mentioned limit lever 9.
and a fan-shaped limit lever 19 pivotally supported by the rotary receiving shaft 11 similar to that described above, and other functional structures are the same as those 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 transmitted to the limit lever 19 via the abutment collar 19a. Limit lever 1
The rear engaging means 19f opposite the front engaging means 19e on the rear edge of the long hole 19b of 9 and the switch actuating lever 2
The activation lever 21 is biased to click by the click locking means 22 through the engagement of the front engaging means 21a in the form of a cut-and-raised tongue piece with the rear engaging means 21b, which is opposite to the front engaging means 21a. Micro switch 8
It is designed to be operated.

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 the vertical movement, there is no need for limit adjustment, and the workability of the shutter is improved. In addition, the structure of the opening/closing mechanism and the electrical circuit are simple, so failures are less likely to occur, and costs can be reduced, making it suitable for smaller shutters.

[Effects of the Invention] As described above, according to the limit switch device according to the present invention, even if the limit lever 9 is pushed by an external force or the external force is released from the pushed position,
By sliding the elongated hole 9d along the engaging means 10a of the switch activation lever 10, it does not affect the switch activation lever 10 for a while, and in the final stage, the switch activation lever 10 is actuated to open and close the micro switch 8. Activate.

Therefore, even if the pushing or releasing position due to the external force is slightly shifted vertically, the shift will be caused by the elongated hole 9.
There is an effect that the microswitch 8 will not be destroyed because it is absorbed by the microswitch 8.

[Brief explanation of drawings]

FIG. 1 is an external view of a limit switch device according to an embodiment of the present invention as equipped, FIG. 2 is a front view of the limit switch device according to a first embodiment of the present invention, and FIG. 3 is a top view of the limit switch device according to the first embodiment of the present invention. 4 is a left side view of the same, FIG. 5 is a rear view of the same, FIG. 6 is a right side view of the same, FIG. 7 is a front sectional view taken along the line - in FIG. 3, and FIG. 7 is a side sectional view taken along the - line, FIG. 9 is an isolated perspective view of FIG. 7, and FIG. 10 a
10c to 10c 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, 10b, 21a, 21b...engaging means, 16,
22...Locking means.

Claims (1)

[Scope of Claims] 1. A micro switch 8, and a flat plate-shaped switch activation lever 10 rotatably provided on a rotary receiving shaft 11 provided near the micro switch 8, the switch activation lever 10 being rotatable in one direction. A switch activation lever 10, a part of which presses and activates the actuation piece 8a of the micro switch 8.
and a flat plate-shaped limit lever 9 which is rotatably provided on the rotary receiving shaft 11 and overlapping with the switch activation lever 10,
Limit lever 9 that is pushed and operated by external force
a spring means 13 for resiliently returning the limit lever 9; an elongated hole 9d formed in one of the overlapping plate surfaces of the switch activation lever 10 and the limit lever 9; and a long hole 9d in the other plate surface. and an engaging means 10a formed of a protruding piece that protrudes into the elongated hole 9d and can come into contact with the inner edge of the elongated hole 9d. or when the limit lever 9 is pushed against the spring means 1.
3. A limit switch device characterized in that, when the limit switch device is elastically returned by the lever 3, the engaging means 10a slides within the elongated hole 9d and then moves the switch activation lever 10.