JPH04192229A - Sliding fixed contact shoe - Google Patents

Abstract

PURPOSE:To facilitate the manufacture of a sliding fixed contact shoe so as to produce it at a low cost by leading a sliding contact shoe, which consists of multiple plate conductors forming the sliding fixed contact shoe, cylindrically, out of the holding cylinder of a holding means and fixing it to a substrate with bolts. CONSTITUTION:A holding cylinder 1 arranged while being closely stuck to the peripheral surfaces of multiple sliding contact shoes 2, which are cylindrically led out of a substrate 4, so that about a half of each contact shoe 2 in the leading direction may be held. Next, a movable contact shoe 7 is inserted in a sliding fixed contact shoe 8 in the arrow A direction, and the contact shoe pieces 2 are bent in the arrow B direction. But, since about a half of each contact shoe piece 2 is closely stuck to and held by the holding cylinder 1, bend of the contact shoe piece 2 in the arrow B direction is regulated so as to have the predetermined restoring force. Namely, each contact shoe piece 2 has a predetermined contact pressure against the contact shoe 7. Consequently, though each contact shoe piece 2 is made of a thin plate conductor, and though the inner surface thereof has a predetermined slide distance, where the contact shoe 7 is slid, the contact shoes 8, 7 make contact with each other securely.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sliding fixed contact used as a contact point in electrical equipment, particularly a switching device or circuit breaker that opens and closes an electric circuit.

[Prior Art] FIG. 5 is a sectional view showing a conventional sliding fixed contact 6 etc. disclosed in, for example, Japanese Utility Model Application No. 55-138715. In the figure, the sliding fixed contact 6 is integrally formed with a base 6a, a plurality of arm parts 6b led out from the base 6a, and a contact part 6c formed on the free end side of the arm 6b. ing. The plurality of arm parts 6b are formed in a cylindrical shape so as to extend from the base part 6a, that is, they have a cylindrical structure that is divided into a plurality of parts and has grooves 6d. A substantially rod-shaped movable contact 7 is inserted into the cylindrical arm 6b (in the direction of arrow A), and the contact portion 6c of the sliding fixed contact 6 slides on the outer peripheral surface 7a of the movable contact 7. It is configured to move and connect electrically. - The movable contact 7 indicated by a dashed line indicates the position where it is inserted into the sliding fixed contact 6.

[Problem to be solved by the invention] The conventional sliding fixed contact is configured as described above,
A sliding fixed contact having such a complicated shape has been manufactured from a cylindrical block of conductive material by machining that requires skill.

For this reason, there was a problem in that the conventional sliding fixed contact was expensive.

This invention was made to solve the above-mentioned problems, and its purpose is to obtain a sliding fixed contact that is easy to manufacture and inexpensive.

[Means for Solving the Problems] A sliding fixed contact according to the present invention includes a substantially rod-shaped movable contact connected to one electric circuit, and a substantially cylindrical movable contact disposed along a substantially cylindrical side line. a plurality of plate-shaped conductors, one end of which is arranged in a substantially annular shape and constitutes a free end portion having elasticity in a radial direction;
a plurality of sliding contact pieces having convex portions formed on the inner surface of the free end portions for sandwiching the movable contact; and fixing the other end of the sliding contact pieces; holding means that holds the outer peripheral surface of the sliding contact piece led out in a substantially cylindrical shape from the fixed end side of the contact piece to approximately the center in the side line direction, and is connected to the other electric circuit. It is something to do.

[Function] The sliding fixed contact according to the present invention has a sliding contact piece, which is a plurality of plate-shaped conductors led out in a cylindrical shape from a holding means electrically connected to one electric circuit, and an electric conductor to the other electric circuit. By inserting the rod-shaped movable contact that is connected to the
spread out radially. However, the outside of the sliding contact piece is
Since the portion of the sliding contact piece from the fixed end side to the approximately central portion is held by the holding cylinder of the holding means in the leading-out direction, radial expansion of this portion is prohibited.

Therefore, the rod-shaped movable contact inserted by the restoring force on the free end side, which is approximately half of the direction in which the sliding contact piece is led out, is reliably electrically connected to the sliding fixed contact.

[Example] Hereinafter, an example of the sliding fixed contact 8 of the present invention will be described with reference to the drawings.

1 is a cross-sectional side view of a sliding contact according to an embodiment of the present invention, FIG. 2 is a perspective view of the sliding fixed contact 8 of FIG. 1, and FIG. 3 is a sliding fixed contact of FIG. 1. FIG. 8 is a cross-sectional perspective view enlarging a portion of the child 8; The sliding fixed contact 8 of this embodiment shown in FIGS.
is inserted (in the direction of arrow A), and this contact becomes electrically connected. As shown in FIGS. 1 and 2, the sliding contact piece 2 is a plate-shaped conductor whose side cross section is formed into an abbreviated shape, and one end of the sliding contact piece 2 is located inside the holding cylinder 1 which is the holding means. , is fixed by a first bolt 3 to a substrate 4 of the holding means connected to one of the electric circuits. Sliding contact piece 2
A convex contact surface 2a is formed on the inner surface of the other end.

This contact surface 2a is the electrical contact surface with the outer peripheral surface 7a of the movable contact 7 when the rod-shaped movable contact 7 is inserted into the plurality of sliding contact pieces 2 arranged in a cylindrical shape. Become. Further, a holding cylinder 1 made of a non-magnetic material is fixed to the outer circumferential surface of the annularly formed substrate 4 with a second bolt 5. As shown in FIG. 1, this holding cylinder 1 is disposed in close contact with the outer peripheral surface of a plurality of sliding contact pieces 2 led out from the substrate 4 in a cylindrical shape. It is configured to hold approximately half of the child piece 2 in the direction in which it is led out.

The closing operation in which the movable contact 7 is inserted in the sliding fixed contact 8 which is one embodiment of the present invention configured as described above will be described below. FIG. 3 is an enlarged perspective view of a portion of the sliding fixed contact 8 with the movable contact 7 inserted into the sliding fixed contact 8 (in the direction of arrow A). In the figure, when the movable contact 7 is inserted in the direction of arrow A, the sliding contact piece 2 is bent in the direction of arrow B. However, since approximately half of the outer side (the upper side of the sliding contact piece 2 shown in FIG. 3) of the sliding contact piece 2 is held tightly by the holding cylinder 1, the sliding contact piece 2 Bending in the direction of arrow B of No. 2 is regulated to have a predetermined restoring force. That is, the sliding contact piece 2 has a predetermined contact pressure with respect to the movable contact 7. Therefore, although the sliding contact piece 2 is a thin plate-shaped conductor,
Furthermore, although the movable contact 7 has a predetermined sliding distance on its inner surface, the sliding fixed contact 8 is reliably in contact with the inserted movable contact 7.

FIG. 4 is a cross-sectional side view showing another embodiment of the sliding fixed contact 80 of the present invention. In FIG. 4, a plurality of sliding contact pieces 20 are drawn out in a cylindrical shape from a holding cylinder lO, similar to the previous embodiment. However, in this embodiment, the holding cylinder lO is made of a conductive material. The inner surface of one end (left end in FIG. 4) of this sliding contact piece 20 is as follows:
A convex surface 20a that contacts the movable contactor 7 is formed.

In addition, as shown in FIG. 4, the holding cylinder 1 is
0 and the surface of the substrate 40 for fixing the sliding contact piece 20 is inclined with respect to the direction in which the sliding contact piece 20 is led out. The other end of this sliding contact piece 20 is fixed to the holding cylinder lO and the substrate 40 with one type of bolt 30. Therefore, since the sliding fixed contact 8o of this embodiment is assembled using one type of bolt 30, the number of assembly steps is reduced and the structure is simple and easy to manufacture.

Also in the other embodiments configured in this way, the sliding contact piece 20 is held by the holding cylinder 10.
Approximately half of the outer side in the leading direction is held in close contact. Therefore, although the sliding contact piece 20 is a thin plate-shaped conductor and has a predetermined sliding distance on the inner surface of which the movable contact 7 slides, the sliding contact piece 20 of this embodiment is The fixed contact 8o has a predetermined contact pressure with respect to the movable contact 7.

[Effects of the Invention] As described above, according to the present invention, the sliding contact pieces, which are a plurality of plate-shaped conductors of the sliding fixed contact, are arranged so as to be led out in a cylindrical shape from the holding cylinder of the holding means. Since the sliding contact piece is fixed to the substrate using bolts, it is possible to obtain a sliding fixed contact that is easy to manufacture and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of a sliding fixed contact according to an embodiment of the present invention, FIG. 2 is a perspective view of the sliding fixed contact of FIG. 1,
3 is a partially enlarged perspective view of the sliding fixed contact shown in FIG. 1, FIG. 4 is a sectional side view of the sliding fixed contact showing another embodiment of the present invention, and FIG. 5 is a conventional FIG. 3 is a cross-sectional side view showing a sliding fixed contact of FIG. In the figure, l is a holding cylinder, 2 is a sliding contact piece, 3 is a first bolt, 4 is a substrate, 5 is a second bolt, 7 is a movable contact, and 8 is a sliding fixed contact. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A substantially rod-shaped movable contact connected to one electric circuit, a plurality of plate-shaped conductors arranged along a substantially cylindrical side line, and one end of these plate-shaped conductors is a free end portion arranged in a substantially annular shape and having elasticity in a radial direction;
A plurality of sliding contact pieces each having a convex portion formed on the inner surface of the free end portion for sandwiching the movable contact, the other end of the sliding contact piece being fixed, and the sliding contact piece Holding means for holding the outer peripheral surface of the sliding contact piece led out in a substantially cylindrical shape from the fixed end side of the child piece up to a substantially central portion in the side line direction, and connected to the other electric circuit. A sliding fixed contact characterized by: