JP2008159481A - Terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal device having large contact pressure for sandwiching a core between a tip edge of a lock piece and a terminal piece while restraining insertion force of the core small, and hardly causing dispersion in the connection state of the core. <P>SOLUTION: In this terminal device, a lock spring 15 has a lock piece 15b extended to reduce the distance to the terminal piece 14b in a direction for inserting the core 34 from one edge on the side where the core 34 is inserted in a center piece 15a, and sandwiching the core 34 between the terminal piece 14b and itself by bringing a tip edge thereof into elastic contact with the core 34; and movement thereof in a direction separating from the terminal piece 14b and in a direction for inserting the core 34 is restricted by coming into contact with a contacting piece 14c and a connection piece 14a arranged in a vessel body 3. A release button 17 includes a press contact part 17b bending the lock piece 15b to form a space between the tip edge of the lock piece 15b and the terminal piece 14b by pressing the lock piece 15b in a state where the core 34 is not inserted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a terminal device having a so-called quick-connection terminal structure in which an electric wire can be connected without using a screw.

  Conventionally, in order to facilitate the connection of electric wires to wiring devices such as switches and outlets, a terminal device having a so-called quick connection terminal structure that can connect electric wires without using screws has been provided (for example, Patent Documents). 1). The configuration of this type of terminal device will be described below.

  In FIG. 6, a push button handle 2 to be pushed is provided on the front side of the body 3, and a terminal device A 1 used for the switch 1 having a contact device B in the body 3 that reverses every time the push button handle 2 is pushed. , A3. The terminal devices A1 and A3 have terminal pieces 14b and 18b electrically connected to the contact device B, and an electric wire 33 (introduced into the body 3 through the wire insertion hole 19 provided in the rear wall of the body 3. A lock spring 15 is provided for holding the core wire 34 (see FIG. 7B) of FIG. 7B between the terminal pieces 14b and 18b. Further, in this type of terminal device A1, A3, a release button 17 for releasing the mechanical connection between the terminal piece 14b and the core wire 34 by the lock spring 15 is provided. In the example of FIG. 6, four wire insertion holes are formed in the container 3 so that four wires 33 can be connected, and four terminal pieces 14b and 18b and four lock springs 15 are provided. Yes. Hereinafter, one terminal device A1 will be described as an example.

  As shown in FIG. 7 (a), each lock spring 15 has a central piece 15a disposed along the insertion direction of the core wire 34 so as to face the terminal piece 14b, and the core wire 34 is inserted into the central piece 15a. The locking piece 15b extended so as to reduce the distance from the terminal piece 14b in the direction in which the core wire 34 is inserted, and the other end edge of the central piece 15a to the terminal piece 14b side. And the pressed piece 15c. As a result, the core wire 34 inserted from the wire insertion hole 19 is clamped between the locking piece 15b and the pressing piece 15c of the lock spring 15 and the terminal pieces 14b and 18b, thereby to the terminal pieces 14b and 18b. It is electrically connected and mechanically connected to the terminal pieces 14b and 18b by the leading edge of the locking piece 15b biting into the core wire 34 and being removed.

  In the terminal device A1 described above, the contact piece 14c disposed so as to interpose the lock spring 15 between the terminal piece 14b, and the side of the lock spring 15 where the core wire 34 is inserted in the insertion direction of the core wire 34; A connecting piece 14a, which is disposed so as to face the opposite end face and connects the terminal piece 14b and the contact piece 14c, is formed integrally with the terminal piece 14b. The contact piece 14c abuts the lock spring 15 to restrict the movement of the lock spring 15 away from the terminal piece 14b, and the connection piece 14a abuts the lock spring 15 to insert the core wire 34. The movement of the lock spring 15 is restricted.

  By the way, in this kind of terminal device A1, when inserting the core wire 34 between the locking piece 15b and the terminal piece 14b, the core wire 34 is pressed against the terminal piece 14b from the locking piece 15b to the core wire 34. The reaction force in the direction and the reaction force in the direction of pushing back the core wire 34 in the insertion direction of the core wire 34 act. Therefore, in order to suppress the insertion force when inserting the core wire 34 against the reaction force in the direction of pushing back the core wire 34, the lock spring 15 generally has a dimension in the opposite direction between the terminal piece 14b and the contact piece 14c. Is set to be smaller than the distance between the contact piece 14c and stored in the container 3 without being positioned, and the locking piece 15b as shown in FIG. 7A in a state where the core wire 34 is not inserted. A gap can be formed between the leading edge of the terminal and the terminal piece 14b.

In this configuration, when the core wire 34 is not inserted, the inclination angle of the locking piece 15b with respect to the terminal piece 14b is smaller than the configuration in which there is no gap between the distal end edge of the locking piece 15b and the terminal piece 14b. Since the reaction force acting in the direction of pushing back the core wire 34 from the locking piece 15b can be suppressed to be small, the insertion force of the core wire 34 can be suppressed small. Further, in the state in which the core wire 34 is inserted as shown by a two-dot chain line in FIG. 7B, the chain is tilted at the same inclination angle as in the configuration in which there is no gap between the distal end edge of the locking piece 15b and the terminal piece 14b. The leading edge of the lock piece 15b bites into the core wire 34 and is prevented from being pulled out.
JP 2003-217400 A (page 2-3)

  However, if a gap is formed between the leading edge of the locking piece 15b and the terminal piece 14b in the state where the core wire 34 is not inserted as described above, the leading edge of the locking piece 15b and the terminal piece 14b The reaction force in the direction of pressing the core wire 34 acting on the core wire 34 from the locking piece 15b against the terminal piece 14b in a state where the core wire 34 is inserted is smaller than the case where there is no gap between the terminal piece 14b and the locking piece 15b. There is a problem that the contact pressure for sandwiching the core wire 34 between the tip edge and the terminal piece 14b becomes small.

  Further, in the state where the core wire 34 is inserted, the terminal device A1 described above is configured such that the lock spring 15 is pressed against the contact piece 14c and the connecting piece 14a as shown by a two-dot chain line in FIG. 7B. Although the lock spring 15 is not positioned in the container 3 in a state where the core wire 34 is not inserted, the lock spring 15 may rattle in the container 3. Therefore, when the core wire 34 is inserted, the lock spring 15 may be displaced with respect to the terminal piece 14b due to the rotation of the lock spring 15 and the connection state of the core wire 34 may vary.

  The present invention has been made in view of the above circumstances, and is a contact pressure for holding the core wire between the distal end edge of the locking piece and the terminal piece while suppressing the insertion force when inserting the core wire small. An object of the present invention is to provide a terminal device that is large and in which the connection state of core wires is less likely to vary.

  According to the first aspect of the present invention, a terminal piece that comes into contact with the core wire of the electric wire introduced into the body from the wire insertion hole that penetrates the body, and the terminal piece is separate from the terminal piece, and the core wire is between the terminal pieces. A lock spring that mechanically and electrically connects the core wire to the terminal piece by sandwiching the terminal piece, and a terminal piece by the lock spring by being operated through an operation hole penetrating in the vicinity of the electric wire insertion hole in the body. A release button for releasing the mechanical connection state with the core wire is provided in the body, and the lock spring is disposed in the center piece arranged along the insertion direction of the core wire so as to face the terminal piece, and the core wire is inserted in the center piece. A chain that extends from one end edge of the terminal to reduce the distance from the terminal piece in the direction in which the core wire is inserted, and holds the core wire between the terminal piece by elastically contacting the tip edge to the core wire By holding a lock piece and abutting against a regulating part provided in the body The movement in the direction away from the child piece and the direction in which the core wire is inserted is restricted, and the lock piece is pressed by pressing the lock piece in a state where the core wire is not inserted into either the body or the release button. A press-contact portion that bends the locking piece so that a gap is formed between the front end edge and the terminal piece is provided.

  According to this configuration, a gap is formed between the distal end edge of the locking piece and the terminal piece by the pressing portion pressing the locking piece in a state where the core wire is not inserted, so that the distal end of the locking piece Compared to the case where there is no gap between the edge and the terminal piece, the insertion force when inserting the core wire between the tip edge of the locking piece and the terminal piece can be reduced. In addition, even when the core wire is not inserted, the pressure contact portion presses the lock piece and bends the lock piece so that a reaction force is generated on the lock piece. The reaction force in the direction of pressing the core wire acting on the core wire from the piece is larger than in the conventional configuration, and the contact pressure for sandwiching the core wire between the distal end edge of the locking piece and the terminal piece increases. Further, when the lock piece is bent, the lock spring is pressed against the restricting portion due to the elasticity of the lock piece, and the lock spring does not rattle in the body even when the core wire is not inserted. Therefore, when the core wire is inserted, the lock spring is not displaced with respect to the terminal piece due to the rotation of the lock spring, etc., and variations in the connection state of the core wire can be suppressed and the core wire can be connected stably.

  According to a second aspect of the present invention, in the first aspect of the present invention, a plurality of the electric wire insertion holes are formed in the container body, and the core wires of the electric wires introduced from the electric wire insertion holes are respectively connected to the terminal pieces. A plurality of lock springs are integrally formed.

  According to this configuration, since the plurality of lock springs are integrally formed, when the lock spring is incorporated into the container against the pressing force from the press contact portion to the lock piece, the plurality of lock springs are separated. The position of the lock spring is stabilized as compared with the case where the lock spring is formed, and the lock spring can be easily incorporated into the body. Accordingly, it is possible to incorporate a lock spring by an automatic assembly machine.

  The present invention provides a gap between the distal end edge of the locking piece and the terminal piece, while suppressing the insertion force when inserting the core wire between the distal end edge of the locking piece and the terminal piece, Since the pressure contact part presses the locking piece and bends the locking piece in a state where the wire is not inserted, a reaction force is generated in the locking piece, so that the core wire is inserted from the locking piece with the core wire inserted. The reaction force acting on is increased, and the contact pressure for sandwiching the core wire between the distal end edge of the locking piece and the terminal piece is increased. Also, since the lock spring does not rattle inside the body even when the core wire is not inserted, the lock spring will not be displaced with respect to the terminal piece due to rotation of the lock spring when the core wire is inserted. There is an advantage that the core wire can be stably connected while suppressing the variation of the above.

  In the following, an example in which the terminal device of the present invention is applied to a switch will be shown, but what is applied to the present invention is not limited to a switch, but also to wiring equipment such as an outlet other than a switch, and other electrical devices. The present invention can be applied.

  As shown in FIG. 2, the switch 1 shown in the present embodiment includes a push button handle 2 that is pushed and operated on the front surface (upper surface in FIG. 2) side of the device 3, and each time the push button handle 2 is pushed, This is a three-way type in which the connection state of the contact device housed in is switched. The configuration of the switch 1 will be described below with reference to FIGS. In the following, the upper, lower, left, and right in FIG. 3A will be described as up, down, left, and right, but the mounting direction of the switch 1 is not limited to this direction.

  The body 3 is formed by a body 4 having a front opening and a cover 5 having a rear opening coupled to the front side of the body 4. From the rear edge of each side wall of the cover 5 in the width direction (vertical direction), a pair of assembly pieces 6 are extended toward the rear, and assembly holes 7 provided in the assembly piece 6 are provided on each side surface of the body 4 in the width direction. The body 4 and the cover 5 are coupled to each other by engaging with the assembly protrusion 8 projecting from the body. The assembling protrusion 8 is formed with an inclined surface 8a that reduces the protruding dimension from the body 4 toward the front, and the assembly piece 6 can be easily coupled to the assembling protrusion 8 simply by applying a force to bring the cover 5 closer to the body 4. It is made to do.

  The switch 1 can be attached to a wall or the like using a well-known attachment frame (not shown) used when attaching the embedded wiring device to the wall or the like. A pair of mounting claws 9 that can be engaged with an instrument mounting hole (not shown) provided in the mounting frame is provided on the side surface, and a pair of the mounting claws 9 are engaged with the instrument mounting hole. The body 3 is held on the mounting frame. In addition, two cutout grooves 10 having rear ends opened on both sides of the pair of mounting claws 9 are formed on one side wall in the longitudinal direction of the cover 5 along the front-rear direction. If the part is bent to the inside of the cover 5, the engagement between the attachment claw 9 and the instrument attachment hole can be released and the body 3 can be removed from the attachment frame.

  The internal space of the body 4 is partitioned into three chambers in the longitudinal direction (left-right direction), the partitions on both sides are terminal storage chambers 11 and 12 in which the terminal device A is stored, respectively, and the central portion is a contact in which the contact device B is stored. A storage chamber 13 is formed. The terminal storage chamber 11 on the left side (upper left in the figure) has a terminal plate 14 and a lock spring 15 constituting the terminal device A1 as the first connection terminal, and a terminal plate constituting the terminal device A2 as the second connection terminal. 16 and the lock spring 15 and a release button 17 shared by the first and second connection terminals are housed, and a terminal device A3 serving as a common terminal is configured in the terminal housing chamber 12 on the right side (lower right in the figure). A terminal plate 18 to be operated, two lock springs 15 and a release button 17 are accommodated. Hereinafter, when the terminal devices A1 to A3 are not particularly distinguished, the terminal devices A1 to A3 are referred to as terminal devices A. In addition, a pair of wire insertion holes 19 (see FIG. 3B) are provided in the rear wall of the body 4 corresponding to the terminal storage chambers 11 and 12, and are respectively provided in the vicinity of the pair of wire insertion holes 19. One operation hole (not shown) is provided through one by one. The terminal device A mechanically and electrically connects the core wire of the electric wire introduced into the container 3 from the electric wire insertion hole 19. The configuration of each terminal device A will be described later.

  Further, as shown in FIG. 3B, contact holding pieces inserted into the contact accommodating chamber 13 are provided on the terminal plates 14 and 16 constituting the terminal devices A1 and A2 as the first and second contact terminals. 14d and 16d are integrally formed, and fixed contacts 20 and 21 are provided at the tip portions of the contact holding pieces 14d and 16d, respectively. Both contact holding pieces 14d, 16d are formed in a form in which the fixed contacts 20, 21 are opposed to each other in the left-right direction in the contact storage chamber 13. On the other hand, a contact piece 18d (see FIG. 2) extending to the contact storage chamber 13 extends from the terminal plate 18 constituting the terminal device A3 as a common terminal. It extends backward toward the rear wall. The leading edge of the connecting piece 18d is connected to a support piece 18e arranged along the inner surface of the rear wall of the contact accommodating chamber 13.

  Between the fixed contacts 20 and 21, a switch 24 provided with movable contacts 22 and 23 that constitute the contact device B together with the fixed contacts 20 and 21 is disposed at a portion facing the fixed contacts 20 and 21, respectively. The The movable contacts 22 and 23 are integrally formed on the front surface side and the back surface side of the switch 24. The opening / closing element 24 is arranged at the rear end of the support piece 18e so as to be movable between a position where the movable contact 22 is brought into contact with one fixed contact 20 and a position where the movable contact 23 is brought into contact with the other fixed contact 21. In a state where the edges are in contact with each other, it is supported so as to be rotatable around the rear edge. Specifically, restriction protrusions 24a (see FIG. 2) are provided on both side edges in the vertical direction of the switch 24, and the front end side provided in the contact storage chamber 13 is restricted to a V-shaped restriction recess 25. By inserting the protrusion 24 a, the opening / closing element 24 can be rotated within the range of the restriction recess 25. That is, the state in which the movable contact 22 is brought into contact with one fixed contact 20 and the state in which the movable contact 23 is brought into contact with the other fixed contact 21 are switched by the rotation of the switch 24. The rear edge of the opening / closing element 24 is positioned by being inserted into a V groove 18f formed on the front side of the support piece 18e.

  Between the push button handle 2 and the opening / closing element 24, there is an inversion mechanism C for switching the connection state of the contact device B by alternately rotating the opening / closing element 24 in the opposite direction for each pressing operation of the push button handle 2. The reversing mechanism C includes a rocker 27 that is attached to the cover 5 with a front end portion exposed to the front side of the cover 5 through a through hole 26 (see FIG. 2) of the cover 5. Triangular fulcrum protrusions 27a having a tapered front end project from both side surfaces of the oscillator 27, and the fulcrum protrusions 27a pivot in bearing grooves 28 formed on both side edges of the through hole 26 and opened rearward. By being supported, the oscillator 27 is swingably attached to the cover 5. The oscillator 27 is connected to the opening / closing element 24 via a reversing spring (not shown) made of a compression coil spring, and when the oscillator 27 swings, the position where the reversing spring is compressed most in the middle of the swinging range. pass. Before and after this position, the direction of the spring force acting on the switch 24 from the reversing spring is reversed, and the switch 24 is moved rapidly by the spring force of the reversing spring to switch the connection state of the contact device B.

  Here, the oscillator 27 is stable in a state in which either one of the left and right directions is inclined forward and left or right. The push button handle 2 is spring-biased forward by a return spring 29 provided between the push button handle 2 and the front surface of the oscillator 27 when the push-button handle 2 is pushed backward against the spring force of the return spring 29. One of the pair of engaging protrusions 27b projecting from the left and right end portions of the left and right ends of the engaging protrusion 27b is pushed backward to swing the oscillator 27 and tilt in the opposite direction.

  In short, the switch 1 has a state in which the terminal device A3 (common terminal) and the terminal device A1 (first connection terminal) are electrically connected each time the push button handle 2 is pushed backward by the above-described configuration, and the terminal device. The state in which A3 (common terminal) and terminal device A2 (second connection terminal) are made conductive is switched.

  3A, the pair of shaft portions 30 projecting obliquely forward from the left end portion of the front surface of the cover 5 has a piano handle (not shown) for pressing the push button handle 2 attached to the body 3. It is for pivoting. A display window 32 for the indicator lamp 31 is formed between the pair of shaft portions 30 of the cover 5.

  Next, the structure of the terminal device A of this embodiment is demonstrated. In the following, the terminal device A1 as the first connection terminal will be described as an example, but the same configuration is adopted in the other terminal devices A2 and A3 (second connection terminal, common terminal) unless otherwise specified. ing.

  As shown in FIG. 1 (a), the lock spring 15 has a central portion 15a at the center portion of a conductive metal strip having elasticity as a central piece 15a, and one end portion of the strip is bent into a J shape. By forming a locking piece 15b that is inclined so as to widen the distance from the central piece 15a toward the tip from the connecting portion with the piece 15a, the other end of the band plate is bent into an S shape. A pressing piece 15c having elasticity is formed in the thickness direction of the central piece 15a.

  The terminal plate 14 includes a connection piece 14a and a terminal piece 14b and a contact piece 14c which are connected by the connection piece 14a and face each other. The lock spring 15 has a flat central piece 15a in contact with the contact piece 14c of the terminal plate 14 and a contact piece so that the locking piece 15b and the pressing piece 15c are opposed to the terminal piece 14b of the terminal plate 14. It arrange | positions between 14c and the terminal piece 14b. Here, in the terminal device A2 as the second connection terminal, the terminal plate 16 is connected by the connecting piece 16a and the connecting piece 16a and the terminal piece 16b and the contact piece 16c facing each other, like the terminal plate 14. On the other hand, in the terminal device A3 as a common terminal, the terminal plate 18 has a configuration in which each of the two terminal pieces 18b and the contact piece 18c are connected by one connecting piece 18a so as to face each other. Accordingly, one lock spring 15 is disposed between each contact piece 18c and each terminal piece 18b.

  As shown in FIG. 1B, the positional relationship between the terminal plate 14 and the lock spring 15 and the wire insertion hole 19 is such that the core wire 34 of the electric wire 33 introduced from the wire insertion hole 19 into the container 3 is It is set to be inserted between the locking piece 15b and the pressing piece 15c and the terminal piece 14b of the terminal plate 14. The wire insertion hole 19 is formed so as to become thinner toward the inner surface side of the container 3, and the core wire 34 inserted into the container 3 from the wire insertion hole 19 is between the lock spring 15 and the terminal piece 14. Is surely guided.

  More specifically, in a state where the lock spring 15 is housed in the container body 3 together with the terminal plate 14, the central piece 15a is arranged along the insertion direction (front-rear direction) of the core wire 34 in a form facing the terminal piece 14b. The locking piece 15b is extended from one end edge (rear end edge) on the side where the core wire 34 is inserted in the central piece 15a so as to reduce the distance from the terminal piece 14b in the direction in which the core wire 34 is inserted. Is extended from the other end edge (front end edge) of the central piece 15a to the terminal piece 14b side. Here, a portion of the pressing piece 15c closer to the tip than the intermediate portion in the longitudinal direction is extended from the intermediate portion of the pressing piece 15c so as to reduce the distance from the terminal piece 14b in the direction in which the core wire 34 is inserted, and The tip is curved so as to be convex toward the terminal piece 14b. Here, the contact piece 14c is in contact with the central piece 15a to restrict the movement of the lock spring 15 in the direction away from the terminal piece 14b, and the connecting piece 14a is located at the end of the pressing piece 15c on the side of the central piece 15a. By abutting, the movement of the lock spring 15 in the direction in which the core wire 34 is inserted is restricted. That is, the contact piece 14c and the connecting piece 14a function as a restricting portion that restricts the movement of the lock spring 15 in the direction away from the terminal piece 14b and the direction of inserting the core wire 34 by contacting the lock spring 15.

  Therefore, when the core wire 34 of the electric wire 33 is inserted from the wire insertion hole 19, the distal end portion of the core wire 34 is inserted between the locking piece 15b and the terminal piece 14b while bending the locking piece 15b toward the central piece 15a. The leading end of the core wire 34 that has passed between the locking piece 15b and the terminal piece 14b is inserted between the pressing piece 15c and the terminal piece 14b while bending the leading end of the pressing piece 15c toward the center piece 15a. The Rukoto. As a result, the core wire 34 inserted from the electric wire insertion hole 19 is clamped between the locking piece 15b and the pressing piece 15c of the lock spring 15 and the terminal piece 14b of the terminal board 14 to the terminal board 14. It is electrically connected and mechanically connected to the terminal board 14 by the leading edge of the locking piece 15b biting into the core wire 34 and being secured.

  The release button 17 is stored in the terminal storage chamber 11 of the body 4 with the rear portion facing the operation hole. The release protrusion 17a formed so as to protrude from a part of the release button 17 to the side of the lock piece 15b can come into contact with the lock piece 15b, and can be released at the tip of a tool such as a flat-blade screwdriver through the operation hole. 17 is pushed, the release protrusion 17a comes into contact with the locking piece 15b and the leading edge of the locking piece 15b is moved away from the terminal piece 14b to weaken the holding force of the core wire 34. 33 can be pulled out. Here, two release protrusions 17a are provided on each release button 17, and the release buttons 17 are arranged so as to straddle each pair of lock springs 15 accommodated in the terminal storage chambers 11 and 12, respectively. The lock pieces 15b of the pair of lock springs 15 can be simultaneously pressed by a single release button 17. The release button 17 is a synthetic resin molded product and can be dimensioned with relatively high accuracy.

  By the way, in the terminal device A of this embodiment, as shown to Fig.1 (a), it formed in the shape which protrudes toward the front-end | tip part of the locking piece 15b ahead of the cancellation | release protrusion 17a in the cancellation | release button 17. A pressure contact portion 17b is provided. The pressure contact portion 17b is pressed between the distal end edge of the locking piece 15b and the terminal piece 14b by pressing the distal end portion of the locking piece 15b in a state where the core wire 34 is not inserted. The locking piece 15b is bent so that a gap is formed between the two. Hereinafter, the position of the locking piece 15b when the core wire 34 is not inserted between the locking piece 15b and the terminal piece 14b is referred to as an initial position. In other words, the pressure contact portion 17b is interposed between the distal end edge of the locking piece 15b in the initial position and the terminal piece 14b, whereby a predetermined distance is provided between the distal end edge of the locking piece 15b and the terminal piece 14b. The gap is secured. Specifically, the contact portion of the pressure contact portion 17b with the locking piece 15b is in surface contact with the locking piece 15b by inclining so as to increase the distance from the central piece 15a in the direction in which the core wire 34 is inserted. The locking piece 15b is bent toward the center piece 15a.

  According to this configuration, the inclination angle of the locking piece 15b with respect to the terminal piece 14b is smaller than that in the configuration without a gap between the distal end edge of the locking piece 15b and the terminal piece 14b when the core wire 34 is not inserted. Since the reaction force acting in the direction of pushing back the core wire 34 from the locking piece 15b can be suppressed small, the insertion force required when inserting the core wire 34 can be suppressed small. On the other hand, in the state where the core wire 34 is inserted, the distal end edge of the locking piece 15b bites into the core wire 34 at an inclination angle similar to the configuration in which there is no gap between the distal end edge of the locking piece 15b and the terminal piece 14b, and is prevented. Will be made.

  Here, since the size of the release button 17 can be determined with relatively high accuracy, the pressure contact portion 17b provided on the release button 17 as in the present embodiment allows the clearance between the distal end edge of the locking piece 15b and the terminal piece 14b. In the configuration in which the gap is formed, the configuration is such that a gap is formed between the distal end edge of the locking piece 15b and the terminal piece 14b due to the shape of the lock spring 15 itself as in the conventional configuration shown in FIG. In comparison, the dimension of the gap can be set with high accuracy, and variations in the dimension of the gap are less likely to occur for each terminal device A. In addition, the clearance gap between the front-end edge of the locking piece 15b in an initial position and the terminal piece 14b is set in the range smaller than the diameter of the core wire 34 of the electric wire 33 made into the terminal device A connection object.

  Further, according to the above-described configuration, even when the core wire 34 is not inserted and the locking piece 15b is in the initial position, the press contact portion 17b presses the locking piece 15b to bend the locking piece 15b. A reaction force is generated in the locking piece 15b. In other words, the locking piece 15b in the initial position is pressed by the pressure contact portion 17b, and thus receives a force in a direction to rotate the tip portion closer to the central piece 15a around the connection portion with the central piece 15a. Therefore, a reaction force in a direction to rotate the tip portion away from the central piece 15a around the connecting portion with the central piece 15a acts on the pressure contact portion 17b. On the other hand, as shown by a two-dot chain line in FIG. 1 (b), in a state where the core wire 34 is inserted between the locking piece 15b and the terminal piece 14b, the locking piece 15b is further bent to cause the locking piece. The tip edge of 15b moves to the center piece 15a side from the initial position by the movement distance S1, and in addition to the reaction force generated in the lock piece 15b at the initial position, the locking piece 15b is moved toward the core wire 34 in addition to the reaction force. A reaction force according to the movement distance S1 acts.

  Accordingly, the reaction force in the direction of pressing the core wire 34 acting on the core wire 34 from the locking piece 15b against the terminal piece 14b with the core wire 34 inserted is relatively large, and the leading edge of the locking piece 15b and the terminal piece 14b The contact pressure for sandwiching the core wire 34 between the two increases. For example, compared with the conventional configuration of FIG. 7B, the movement distances S1 and S2 from the initial position of the distal end edge of the locking piece 15b in the state where the core wire 34 of the same diameter is inserted are the present embodiment and the conventional configuration. In this embodiment, the reaction force in the direction of pressing the core wire 34 acting on the core wire 34 from the locking piece 15b against the terminal piece 14b is equal to the reaction force generated in the locking piece 15b at the initial position. This is larger than the conventional configuration. Therefore, when the reaction force in the direction of pressing the core wire 34 acting on the core wire 34 from the locking piece 15b against the terminal piece 14b is made equal between the conventional configuration and the present embodiment, the core wire 34 having the same diameter is inserted. In this embodiment, the movement distances S1 and S2 from the initial position of the distal end edge of the locking piece 15b are shorter in the present embodiment than in the conventional configuration. In other words, in this embodiment, the chain at the initial position is shorter than in the conventional configuration. It is possible to secure a large gap between the tip edge of the lock piece 15b and the terminal piece 14b, and to suppress the insertion force when the core wire 34 is inserted.

  Furthermore, since the lock piece 15b is bent by being pressed by the pressure contact portion 17b as described above at the initial position, the lock spring 15 is bent by the elasticity of the lock piece 15b even when the core wire 34 is not inserted. 15a is pressed against the contact piece 14c, and the pressing piece 15c is pressed against the connecting piece 14a. That is, in the state where the locking piece 15b is in the initial position, the spring force in the direction indicated by the arrow P in FIG. 1A is applied from the locking spring 15 to the pressure contact portion 17b, the contact piece 14c, and the connecting piece 14a. As a result, the lock spring 15 does not rattle in the body 3. Therefore, even if the lock piece 15b is pushed at the tip of the core wire 34 when the core wire 34 is inserted, the lock spring 15 does not rotate and the position of the lock spring 15 relative to the terminal piece 14b does not occur. The dispersion of the connection state of 34 can be suppressed, and the core wire 34 can be connected stably.

  Next, a method for assembling the terminal device A will be described with reference to FIG.

  As shown in FIG. 4A, the lock spring 15 is assembled into the terminal storage chamber 11 after the release button 17 is assembled into the terminal storage chamber 11 of the body 4. At this time, the distal end portion of the locking piece 15b receives a pressing force from the pressure contact portion 17b of the release button 17. Therefore, in order to incorporate the lock spring 15 into the terminal storage chamber 11, the pressure contact portion 17b is moved to the locking piece 15b. It is necessary to push the lock spring 15 into the body 4 against this pressing force.

  Here, in the present embodiment, when the terminal plate 14 is assembled to the body 4 as shown in FIG. 4B, the lock spring 15 is pushed in by the connecting piece 14a and the contact piece 14c of the terminal plate 14, whereby the body 4 On the other hand, the lock spring 15 and the terminal plate 14 are assembled. In this state, the lock spring 15 is pushed into the terminal storage chamber 11, so that the lock spring 15 is incorporated into the body 4 without being pushed as shown in FIG. 15 will not rattle. And the component parts of the other terminal device A (second connection terminal, common terminal) are also incorporated in the body 4 in the same manner, and the body 4 and the cover 5 are combined with other components such as the opening / closing element 24 incorporated. Thus, the assembly of the terminal device A is completed. In the present embodiment, each terminal plate 14, 16, 18 is provided with a protrusion 35 at a plurality of locations facing the inner surface of each terminal storage chamber 11, 12, and this protrusion 35 is stored in the terminal storage. Since they are in contact with the inner surfaces of the chambers 11 and 12, the terminal plates 14, 16 and 18 do not easily come out of the body 4 even when the cover 5 is not coupled to the body 4.

  By the way, in embodiment mentioned above, although the structure in which all the four lock springs 15 accommodated in the container 3 were formed separately was employ | adopted, the some lock spring 15 was formed integrally. A configuration may be adopted. For example, as shown in FIG. 5, the two lock springs 15 of the terminal device A3 as a common terminal can be configured to be continuously and integrally coupled by a coupling piece 15d. The two lock springs 15 to be joined here have the same polarity, and are electrically connected by the terminal plate 18 also in the above embodiment. According to this configuration, since the two lock springs 15 are integrally formed, each of the lock springs 15 is incorporated into the body 3 against the pressing force from the pressure contact portion 17b to the lock piece 15b. Compared with the case where the lock spring 15 is formed as a separate body, the rotation of the lock spring 15 in the container body 3 is suppressed and the position of the lock spring 15 is stabilized, and the lock spring 15 to the container body 3 is stabilized. Easy to install. Therefore, the lock spring 15 can be incorporated by an automatic assembly machine.

  Moreover, although the example which provided the press-contact part 17b in the cancellation | release button 17 was shown in embodiment mentioned above, it is not restricted to this example, For example, the locking piece 15b in an initial state in a part of inner surface of the container 3 is shown. A pressing portion for bending the locking piece 15b may be provided so that a gap is formed between the distal end edge of the locking piece 15b and the terminal piece 14b by pressing. Even in this configuration, the same effect as the above-described embodiment can be expected.

  Furthermore, in the above-described embodiment, when releasing the connection state of the electric wire 33 among the release buttons 17, the distal end edge of the lock piece 15b is moved in a direction away from the terminal piece 14b by coming into contact with the lock piece 15b. Although the example in which the release protrusion 17a is provided separately from the press contact portion 17b is shown, the press contact portion 17b may also function as the release protrusion 17a. In this case, when the connection state of the electric wire 34 is released, the pressure contact portion 17b is brought into contact with the locking piece 15b by pressing the release button 17 so that the leading edge of the locking piece 15b is connected to the terminal piece 14b. Move away from. According to this configuration, the pressure contact portion 17b also contacts the locking piece 15b in the initial state. Therefore, the distance until the release protrusion 17a locks the locking piece 15b in the state where the core wire 34 is inserted is locked. Therefore, the distance to move the release button 17 when the connection state of the wire 34 is released is relatively short. As a result, even when it is difficult to insert a tool such as a minus driver deep into the operation hole, the connection state of the electric wire 33 can be easily released.

  Note that the switch 1 to which the terminal device A of the present invention can be applied is not limited to the above-described three-way type. For example, the terminal device A of the present invention is applied to a switch 1 such as a single-cut type, a double-cut type, or a four-way type. You may apply.

The terminal device of embodiment of this invention is shown, (a) is sectional drawing of the state in which the core wire is not inserted, (b) is sectional drawing of the state in which the core wire was inserted. It is a disassembled perspective view of a switch same as the above. The structure of a switch same as the above is shown, (a) is a front view, (b) is a DD sectional view of (a). (A), (b) is explanatory drawing which shows the assembly method of the contact apparatus same as the above, (c) is explanatory drawing which shows the assembly method of the contact apparatus of a conventional structure. It is a disassembled perspective view which shows the other structure same as the above. The structure of a prior art example is shown, (a) is a front view, (b) is DD sectional drawing of (a). The terminal device same as the above is shown, (a) is a sectional view in a state where a core wire is not inserted, and (b) is a sectional view in a state where a core wire is inserted.

Explanation of symbols

3 container 14, 16, 18 terminal plate 14a, 16a, 18a connecting piece 14b, 16b, 18b terminal piece 14c, 16c, 18c contact piece 15 lock spring 15a central piece 15b chain lock piece 17 release button 17b pressure contact part 19 electric wire Insertion hole 33 Electric wire 34 Core wire A1-A3 Terminal device

Claims (2)

  A terminal piece that comes into contact with the core wire of the electric wire introduced into the body through an electric wire insertion hole that penetrates the container body, and a terminal piece that is separate from the terminal piece by sandwiching the core wire between the terminal pieces. A mechanical connection between the terminal piece and the core wire by the lock spring by mechanically and electrically connecting the core wire with the lock spring and an operation hole penetrating in the vicinity of the electric wire insertion hole in the body. And a release button for releasing the lock, and the lock spring is formed from a central piece arranged in the insertion direction of the core wire so as to face the terminal piece, and from one end edge of the central piece on the side where the core wire is inserted. A locking piece that extends to reduce the distance from the terminal piece in the direction in which the core wire is inserted, and holds the core wire between the terminal piece by elastically contacting the tip edge to the core wire, Orientation away from the terminal piece by abutting against the restriction provided in the body And the movement in the direction in which the core wire is inserted is restricted, and the leading edge and the terminal of the locking piece are pressed by pressing the locking piece in a state where the core wire is not inserted into either the body or the release button. A terminal device, characterized in that a press contact portion is provided to bend the locking piece so that a gap is formed between the piece and the piece.   A plurality of the wire insertion holes are formed in the container, and a plurality of lock springs for connecting the core wires of the wires introduced from the wire insertion holes to the terminal pieces are integrally formed. The terminal device according to claim 1.

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