JPS6015292Y2 - Datsushi pot - Google Patents

Description

[Detailed description of the invention] As shown in Fig. 1, a conventional dashpot has a plunger C made of a magnetic material and a spring d inserted into a cylinder b made of a non-magnetic material having a flange a at the upper end opening, and a plunger C made of a magnetic material and a spring d. An annular protrusion g corresponding to the collar a of the cylinder b is integrally formed on the periphery of the lower surface of the lid f made of a magnetic material from which a cylindrical portion e can be integrally projected from the center, and the cylindrical portion e is connected to the upper end opening of the cylinder a. The cylinder is fitted into the inner circumference of the cylinder, the protrusion g is welded to the flange a by spot welding or other method, and oil is sealed in the cylinder a, and the protrusion g of the lid f is attached to the flange a. When welding, the tip of the protrusion g and the upper surface of the flange a are melted and joined together, and dust is generated and the gap h between the lower surface of the lid f and the opening edge of the cylinder b is is necessarily provided by forming a protrusion g on the periphery of the lower surface of the lid f.

) is compressed, and the circumferential shell at the upper end of cylinder b into which the columnar part e can be fitted expands due to the compressed oil in the gap, and the gap between the inner circumferential shell at the upper end of cylinder b and the outer circumferential shell of columnar part e is compressed. A gap was created in the cylinder B, and the oil in the gap entered the cylinder B together with the dust, making it impossible for the plunger C to move smoothly inside the cylinder B.

The present invention is intended to eliminate the above-mentioned drawbacks of the conventional technology, and an embodiment of the present invention will be described below with reference to the drawings. 1 is a cylinder made of a non-magnetic material having a flange 2 at the upper end opening; 3
is a plunger made of a magnetic material, and is movably inserted into the cylinder 1.

Reference numeral 4 denotes a spring that is elastically loaded inside the cylinder 3 to press the cylinder 3 downward, and 5 has a cylindrical part protruding from the center of the lower surface, a raised part 7 at the center of the upper surface, and a small through hole 8 at the center axis. A cover body made of a magnetic material is provided with an annular protrusion 9 corresponding to the collar 2 protruding from the lower surface of the periphery, and the cylindrical part 6 is inserted into the inner peripheral body of the upper end opening of the cylinder 1 to form the protrusion 9. The upper end opening of the cylinder 1 is closed by spot welding to the upper surface of the flange 2, and by injecting oil through the small through hole 8 and compressing and deforming the raised portion 7, the small through hole 8 is closed. Oil is sealed inside the cylinder 1.

10 is a movable iron piece whose one end is pivoted to the other end of a magnetic plate 11 which is fixed to the outer circumferential shell of the intermediate portion of the cylinder 1, and whose free end faces the outer surface of the lid body 5; 12 is a free iron piece of the movable iron piece 10; A spring 13 whose end is resiliently loaded so as to be pulled away from the outer surface of the lid 5 is a coil wound around the outer circumferential body of the cylinder above the fixed portion between the cylinder 1 and the magnetic plate 11.

The present invention has the above-mentioned configuration, and when an overcurrent flows through the coil 13, the plunger 3 slowly moves upward against the spring 4 under the braking force of the oil in the cylinder 1, and the upper end of the plunger 3 moves upward. When it comes into contact with the lid 5, the coil 1 of the magnetic path consisting of the plunger 3, the magnetic plate 11, the movable iron piece 10, and the lid 5
2, and the free end of the movable iron piece 10 is attracted to the upper surface of the lid 5. For example, when the coil 13 and a circuit breaker are connected in series and connected to an electric line, there is When the current flows, the free end of the movable iron piece 10
The circuit breaker can be opened in conjunction with the movement of the movable iron piece.

In this way, the present invention provides a cylinder 1 having a flange 2 at the upper end opening.
A plunger 3 and a spring 4 are inserted therein, a cylindrical part 6 is protruded from the center of the lower surface, and a raised part 7 is formed at the center of the upper surface. An annular protrusion 9 corresponding to
The protrusion 9 is fitted into the inner circumferential body of the upper end opening and welded to the collar 2. Oil is injected into the cylinder 1 through the small through hole 8, and the protrusion 7 of the lid body 5 is pressed and deformed to form the cylinder 1. Since the cylinder is sealed with oil, the dust generated when the protrusion of the lid body is welded to the cylinder collar does not enter the cylinder, and the plunger moves smoothly and has a killing effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional dashpot, FIG. 2 is a sectional view of an embodiment of the present invention, and FIG. 3 is an assembly diagram. 1 is cylinder, 2 is tsuba, 3 is plunger, 4 is spring, 5
is a lid body, 6 is a cylindrical part, 7 is a raised part, 8 is a through hole, 9 is a protrusion, 10 is a movable iron piece, 11 is a magnetic plate, 12 is a spring,
13 is a coil.

Claims (1)

[Scope of utility model registration request] A plunger 3 is disposed within a cylinder 1 having a flange 2 at the upper end opening.
A small through hole 8 is formed in the center axis of the lid body 5 into which the spring 4 is inserted, a cylindrical portion 6 is protruded from the center of the lower surface, and a raised portion 7 is formed at the center of the upper surface.
An annular protrusion 9 corresponding to the flange 2 is provided on the lower surface of the periphery, and the cylindrical part 6 of the lid body is fitted into the inner circumference of the upper end opening of the cylinder 1, so that the protrusion 9 is attached to the flange 2. This dashpot is made by welding, injecting oil into the cylinder 1 through a small through hole 8, and pressing and deforming the raised part 7 of the lid 5 to seal the oil inside the cylinder 1.