JP4249964B2 - Spring actuator for switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spring actuator for a switch that stores a spring and drives a movable part of the switch such as a disconnect switch by the energy of the spring.
[0002]
[Prior art]
Spring actuators are used to turn on and off switches such as disconnect switches. FIG. 4 is a perspective view of a conventional switch actuator for a switch. The switch spring operating device is used to turn on / off the disconnecting switch via an operating rod connected to a connecting lever attached to the output shaft.
[0003]
In FIG. 4, the rotational force of the geared motor 1 is decelerated by a worm wheel 4 paired with a worm shaft 2 directly connected to the output shaft of the geared motor 1, and is engaged with the worm wheel 4 by engagement step portions 4a and 5a. The toggle lever 5 is rotated. Instead of the geared motor 1, the manual operation handle 2c can be connected to the operation shaft 2d of the bevel gear 2b and rotated.
[0004]
By rotating the toggle lever 5, the toggle spring 8 having one end fixed and the other end connected to the toggle lever 5 is compressed. When the toggle lever 5 and the toggle spring 8 are in a straight line to form a dead point, the toggle spring 8 is compressed to the maximum. Further, the toggle lever 5 rotates and is released immediately after the toggle spring 8 exceeds the dead point. Thus, the toggle lever 8 performs a quick operation. At this time, the toggle lever 5 is disengaged from the worm wheel 4, and the toggle lever 5 is driven by the releasing force of the toggle spring 8. Further, the engagement step portion 5 b of the toggle lever 5 and the engagement step portion 9 a of the lever 9 are driven. The lever 9 driven by the engagement of the output shaft 11 drives the output shaft 11 via a fork-shaped scissor lever 12 engaged with a roller 10 provided on the lever 9, and is connected to a connecting lever 13 of the output shaft 11. The disconnector 14 is turned on and off via 15.
[0005]
FIG. 5 is a diagram showing a load torque of a conventional spring actuator and an output torque characteristic of the actuator. In the conventional spring actuator, the load of the toggle spring is large at the dead point when the output shaft starts to move but the moment arm of the toggle lever is small, and at the end of the output shaft movement, the moment arm of the toggle lever is large but the toggle spring is Since the load becomes small, the torque of the toggle lever has a mountain shape with a peak in the middle of the operation.
[0006]
On the other hand, the load characteristic of the switch to which the spring operating device is applied requires a large torque at the beginning of the stroke or at the end of the stroke, and is therefore converted to a bathtub-type characteristic having a bottom in the middle of operation by the scissors lever.
[0007]
[Problems to be solved by the invention]
The load characteristics of the switch are completely different between on and off as shown in FIG. On the other hand, the torque characteristics converted by the scissor lever must be the same characteristics when turned on and off, and excessive torque is generated at the beginning of the stroke and at the end of the stroke, resulting in the following problems.
[0008]
(1) Since unnecessary energy is released, the spring load is more than necessary, and the size of the operating device increases.
[0009]
(2) Since excessive torque is generated at the end of the stroke, the shock absorber becomes large.
[0010]
(3) Loss due to sliding friction at the scissor lever is large.
[0011]
Therefore, the present invention provides a spring actuator for a switch that can arbitrarily set an output torque characteristic and can realize a torque characteristic according to a load.
[0012]
[Means for Solving the Problems]
In the present invention, a toggle spring is connected to a rotatable toggle lever, the toggle lever rotates to form a dead point, and the toggle lever rotates to the toggle lever immediately after the dead point is exceeded. In a spring actuator for a switch that is operated by turning the output shaft driven by the toggle lever and turning the switch on and off, a relay shaft and a link are provided between the toggle lever and the toggle spring. The output torque characteristic can be arbitrarily set by setting the lever angle, and the torque characteristic corresponding to the load can be realized.
Different output shaft torque characteristics can be provided depending on the rotation direction, and in one rotation direction, the initial rotation can be larger than the end of rotation, and in the other rotation direction, the initial rotation can be smaller than the end of rotation.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view of a spring operating device of the present invention. Although the geared motor and the worm shaft are not shown in FIG. 1 for drawing, there is no difference from the geared motor and the worm shaft of the conventional spring operating device shown in FIG. As shown in FIG. 3, the output shaft of the geared motor 1 is directly connected to a worm shaft 2 having a worm 2a provided at the tip, and the worm 2a meshes with a worm wheel 4 rotatably supported on the shaft 3. By driving the motor 1 and rotating the worm shaft 2, the worm wheel 4 can be decelerated and rotated. Note that the worm shaft 2 may be provided with a bevel gear 2b and be rotated by connecting the manual operation handle 2c to the operation shaft 2d of the bevel gear 2b as in the conventional spring operation device.
[0014]
A toggle lever 5 is rotatably supported on the shaft 3 adjacent to the worm wheel 4. On the worm wheel side of the toggle lever 5, an engagement step portion 5a that engages with the engagement step portion 4a of the worm wheel 4 is formed, and the toggle lever 5 is rotated by the engagement of both the engagement step portions 4a and 5a. .
[0015]
One end of a link 6 is pivotally attached to the toggle lever 5, and the other end of the link 6 is pivotally attached to one end of a relay lever 7 pivotally supported by a shaft 7a. The other end of the relay lever 7 is pivotally attached to the other end of the toggle spring 8 to which one end is fixed. As the toggle lever 5 rotates, the relay lever 7 rotates via the link 6 to compress the toggle spring 8.
[0016]
A connecting lever 13 is rotatably disposed adjacent to the toggle lever 5, and an engaging step portion 13 a that engages with the engaging step portion 5 b of the toggle lever 5 is formed on the toggle lever side of the connecting lever 13. The toggle lever 5 rotates the lever 13 by the engagement of the engaging steps 5b and 13a. The engaging step portion 5b of the toggle lever 5 and the engaging step portion 13a of the connecting lever 13 are formed so as to engage when the compressed toggle spring 8 forms a dead point. The operating rod 15 of the disconnector 14 is connected to the connecting lever 13.
[0017]
Next, the operation of the spring operating device of the present invention will be described. FIGS. 2A to 2C are views showing a state in which the toggle lever and the toggle spring are changed.
[0018]
When the worm shaft 2 is rotated by the geared motor 1 or the manual handle 2c from the cut state, the worm wheel 4 is rotated, and the engagement step 4a of the worm wheel 4 and the engagement step 5a of the toggle lever 5 are engaged. The toggle lever 5 is rotated clockwise.
[0019]
The rotation of the toggle lever 5 rotates the relay lever 7 counterclockwise via the link 6 and compresses the toggle spring 8 (see FIG. 2A).
[0020]
When the toggle lever 5 is rotated by the rotation of the worm wheel 4 and the toggle lever 5 and the link 6 are positioned on a straight line, a dead point where torque does not act on the toggle lever 5 is obtained (see FIG. 2B).
[0021]
When further rotating beyond this dead point, the rotation direction of the relay lever 7 is reversed in the clockwise direction, the compressed state of the toggle spring 8 is released and accelerated, the toggle lever 5 is further rotated in the clockwise direction, and the connecting lever 13 Is turned clockwise, and the disconnecting switch 14 is put into the in-turning state via the operation rod 15 connected thereto. (See FIG. 2 (c)).
[0022]
As shown in FIG. 3, the present invention has an output shaft torque characteristic that varies depending on the rotation direction. In one rotation direction, the initial rotation is greater than the end of rotation, and in the other rotation direction, the output initial torque is smaller than the end of rotation. Characteristics can be obtained.
[0023]
【The invention's effect】
According to the present invention, a relay shaft and a link are provided between a toggle lever and a toggle spring, and an output torque characteristic can be arbitrarily set by setting a lever angle of the relay shaft, thereby realizing a torque characteristic corresponding to a load.
Since the useless release of energy can be suppressed, the spring operating device can be made compact. Since the generation of excessive torque at the end of the stroke can be suppressed, the shock absorber can be made small.
[Brief description of the drawings]
FIG. 1 is a perspective view of a spring operating device according to the present invention.
FIGS. 2A to 2C are views showing a state in which a toggle lever and a toggle spring of the spring operating device of the present invention are changed.
FIG. 3 is a diagram showing torque characteristics of the present invention and a conventional output shaft.
FIG. 4 is a perspective view of a conventional switch spring actuator.
FIG. 5 is a diagram showing load torque of a conventional spring actuator and output torque characteristics of the actuator.
[Explanation of symbols]
1: geared motor 2: worm shaft 3: shaft 4: worm wheel 5: toggle lever 6: link 7: relay lever 8: toggle spring 9: lever 10: roller 11: output shaft 12: scissor lever 13: connecting lever 14: Disconnector 15: Operation rod

Claims (2)

A toggle spring is connected to a rotatable toggle lever, the toggle lever rotates to form a dead center, and the toggle lever rotates quickly after the toggle lever rotates and exceeds the dead center. In the spring actuator for the switch that turns the switch on and off by the rotation of the output shaft driven by the toggle lever,
One end of the link is pivotally attached to the toggle lever, the other end of the link is pivotally attached to one end of the relay lever pivotally supported by the shaft, and the other end of the relay lever is pivotally attached to the other end of the toggle spring to which one end is fixed. And a relay lever connected so that an output shaft torque characteristic that varies depending on a rotation direction can be obtained by setting a lever angle .   2. The output shaft torque characteristic that varies depending on the rotation direction is an output shaft torque characteristic in which the initial rotation is greater than the end of rotation in one rotation direction and the initial rotation is smaller than the end of rotation in the other rotation direction. The spring actuator for a switch as described.

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