JPS6226894Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pneumatic operation mechanism for a breaker.

There are various operating mechanisms for the shredder breaker, one of which uses compressed air. 1A and 1B are principle explanatory diagrams showing the pneumatic operation mechanism of a conventional shredder cutter, showing the closed state and the shredded state, respectively, where 1 is the cylinder, 2 is the piston, 3 is the operating shaft, and 4 5 is a movable contact, and 5 is a fixed contact. It is assumed that a spring spring (not shown) is provided between the cylinder 1 and the piston 2 to press the piston 2 downward in the figure. However, in this mechanism, since the biasing force of the bow spring acts upon closing, it is necessary to constantly fill the cylinder 1 with air in order to maintain the closing state shown in FIG. 1A. The need for a high-quality device that can immediately supply air into the cylinder 1 in response to depressurization due to air leakage is expensive, and the compressed air supply system may be damaged due to long-term power outages, strong winds, natural disasters such as earthquakes, etc. It also had the disadvantage that it could not cope with pressure reduction when it became inoperable, making it difficult to maintain the closed state.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks, provide a pneumatic operating mechanism for a disconnector that can reliably maintain the closed state, and is inexpensive.

The structure of the present invention to achieve such an object includes a cylinder, a first piston slidably provided in the cylinder, one end connected to the first piston, and the other end connected to the movable breaker. An operating shaft is coupled to the contact and has an engaging portion formed near the first piston, and is biased toward the operating shaft by a spring and engages with the engaging portion when the shear breaker is in the closed state. a holding member that holds the operating shaft in the input position;
a second piston that is slidably inserted between the engaging portion of the operating shaft and the first piston and is slidably provided within the cylinder and has an engaging oblique portion formed on the outer periphery of the end on the engaging portion side; a step-forming ring member fixed between the first piston and the second piston with the operating shaft inserted into the cylinder; a stepped portion that prevents the second piston from moving toward the first piston; and a return spring that biases the second piston toward the first piston.
An input air supply port is formed in the cylinder and is used to move the first piston toward the second piston; It is characterized by comprising an air supply port for supplying air between the two pistons and a disconnection air supply port.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 2, 6 is a cylinder, and the cylinder 6 is integrally formed between the first cylinder 6a and the second cylinder 6b via a step-forming ring body 6c having an air supply port 18 for cutting. There is. 7 is a first piston slidably and airtightly fitted into the cylinder 6;
8 has one end connected to the first piston 7 and the other end a movable contact (not shown) for a disconnector.
The first piston 7 is connected to the first piston 7, and has a stepped portion 8a serving as an engaging portion. Reference numerals 9 and 10 designate hooks as holding members rotatably attached to the upper extension portion 6d of the second cylinder 6b via shafts 11 and 12, respectively. It has hanging parts 9a and 10a which are provided so as to sandwich the shaft 8 and engage with the step part 8a, respectively, and the pins 13 and 14 provided respectively are connected by springs 15 and 16, and both are attached to the operating shaft 8. The facing side is energized.
Reference numeral 17 denotes a second piston that is inserted into the second cylinder 6b and is slidable on the second cylinder 6b and the operating shaft 8, and the upper end outer periphery of the second piston 17 is An inclined portion 17a for pushing open the hooks 9, 10 is formed on the surface, and movement of the second piston 17 in the direction of the first piston is restricted by a step-forming ring 6c. Reference numeral 19 indicates an input air supply port provided at the lower end of the first cylinder 6a, and reference numeral 20 indicates a step formed inside the second cylinder 6b to prevent the second piston 17 from moving upward. and the second piston 17.
This is a return spring that urges 7 downward.

In the above device, FIG. 2A shows the closed state, in which the stepped portion 8a of the operating shaft 8 and the hanging portions 9a, 10a of the hooks 9, 10 are engaged, respectively, and the air in the first cylinder 6a is reduced in pressure. However, the operating shaft 8 will not descend. Here, when compressed air is fed between the first piston 7 and the second piston 17 in the cylinder 6 from the air supply port 18 for cutting, the second piston 17 moves upward, and as shown in FIG. As shown in B, the inclined portion 17a pushes open each hook 9, 10 against the urging force of the springs 15, 16. As a result, the engagement between the stepped portion 8a and the hanging portions 9a and 10a is disengaged, and the operating shaft 8 descends due to its own weight and the air pressure that pushes the first piston 7 downward, resulting in a shriveled state. Thereafter, when the supply of air from the shrinkage air supply port 18 is stopped, the second piston 17 is lowered by the action of the return spring 20, resulting in the state shown in FIG. 2D. When compressed air is introduced from the input air supply port 19 from the state shown in FIG. Hanging parts 9a, 10
a engages with the stepped portion 8a to maintain the closed state.

3A to 3E show another embodiment, which has the same structure as the previous embodiment, but rollers 23 and 24 are rotatably attached to hooks 9 and 10 through shafts 21 and 22, respectively. By providing rollers 23, 24
is engaged with the stepped portion 8a, and the shaft 1
The difference is that rollers 25 and 26 are also rotatably provided in No. 3 and 14 so that the rollers 25 and 26 engage with the inclined portion 17a of the second piston. In this way, each hook 9, 10, the stepped portion 8a and the inclined portion 17 of the second piston 17
There is no sliding resistance when engaging with a, so engagement is performed smoothly, and wear resistance is also good in the case of frequent use. Note that 27 is a spring provided between the step-forming ring body 6c and the first piston 7, and assists the first piston 7 to descend.

The present invention has the above configuration, and when the operating shaft is turned on, the holding member automatically engages with the engaging portion of the operating shaft by the biasing force of the spring, and the operating shaft is reliably maintained in the inserted state. Therefore, even if pressure reduction occurs in the first cylinder, the closed state will not be disrupted, and therefore, there is no need for a high-grade compressed air supply device that immediately operates in response to pressure reduction, resulting in lower costs. . Furthermore, it goes without saying that the closed state is maintained even if pressure reduction occurs due to a power outage or natural disaster.

[Brief explanation of the drawing]

Figures 1A and 1B show the principle of the air operation mechanism of a conventional shingle breaker. Figure 1A is a configuration diagram showing the closing state, and Figure 1B is a configuration diagram showing the winding disconnection state. Figures 2A to 2D show an embodiment of the pneumatic operation mechanism of the shear cutter according to the present invention. Figure 2A is a longitudinal sectional front view of the closed state, and Figure 2B is the engagement of the holding member. FIG. 2C is a side view, FIG. 2D is a longitudinal sectional front view of the cross-sectional state, and FIGS. 3A to 3E show other embodiments. Figure 3A is a longitudinal sectional front view of the loaded state, Figure 3B is a side view thereof, Figure 3C is a cross-sectional plan view taken along line ABCD in Figure 3, and Figure 3D is when the holding member is disengaged. FIG. 6...Cylinder, 6a...First cylinder, 6
b...Second cylinder, 6c...Step forming ring,
7...First piston, 8...Operation shaft, 8a...
Step part, 9, 10... Hook, 9a, 10a... Hanging part, 15, 16... Spring, 17... Second piston, 17a... Inclined part, 8... Shrinking air supply port, 19... Air supply port for input, 20... Return spring.

Claims (1)

[Scope of utility model registration request] a cylinder; a first piston slidably disposed within the cylinder; one end coupled to the first piston; the other end coupled to a movable contact of the shield cutter; An operating shaft forming an engaging portion, and a holding member that is biased toward the operating shaft by a spring and engages with the engaging portion to hold the operating shaft in the closing position when the shredder disconnector is in the closing state. It is slidably inserted between the engaging part of the operating shaft and the first piston, and is also slidably provided in the cylinder and has a blade on the outer periphery of the end on the engaging part side that connects the holding member and the operating shaft in the event of breakage. a second piston formed with an inclined portion for disengaging the first piston and the second piston;
a step-forming ring which is fixed between the second piston and the second piston with the operating shaft inserted into the cylinder; a stepped portion, a return spring that biases the second piston toward the first piston, and an intake air supply port that is formed in the cylinder and that moves the first piston toward the second piston. and a cut-off air supply port that is formed by penetrating the inside and outside of the stepped forming ring and supplies air between the first piston and the second piston. Pneumatic operation mechanism for the breaker.