JP6026166B2 - Disconnect terminal block - Google Patents

Description

  The present invention relates to a disconnect terminal block capable of converting a circuit interconnecting lead wires into a disconnected state by operating a switch member.

  A disconnect terminal block is known that can convert a circuit that interconnects lead wires into a disconnected state by operating a switch member (for example, Patent Document 1). As shown in FIG. 9, the disconnect terminal block 1 a includes a pair of conductive metal fittings 4 and 4 having a connecting portion 20 for connecting a lead wire L, and a short-circuit gap formed between the pair of conductive metal fittings 4 and 4. 8, an elastically deformable conductive movable contact 9a, and a switch member 2a for holding the movable contact 9a. In this disconnect terminal block 1a, as shown in FIG. 9A, when the switch member 2a is operated so that the movable contact 9a is press-fitted into the short-circuit gap 8, the pair of conductive members 9a are connected by the movable contact 9a. The metal fittings 4 and 4 are short-circuited so that the lead wires L on both sides can be interconnected. Further, as shown in FIG. 9B, when the switch member 2 a is operated so that the movable contact 9 a is pulled out from the short-circuit gap 8, the conductive fittings 4, 4 are divided by the short-circuit gap 8. The lead wires L on both sides are insulated.

JP 2006-277554 A

  By the way, in the conventional disconnecting terminal block 1, as shown in FIGS. 9 and 10, the movable contact 9a is constituted by a leaf spring that is folded back in a V shape on the base end side and elastically deformed in the reduced width direction. It is held in a mounting groove 34 formed at the tip of the member 2a. Here, the shape of the mounting groove 34 is formed narrower than the movable contact 9a (two-dot chain line in the figure) in the steady state, and the movable contact 9a is formed in the mounting groove 34 in a reduced state. The mounting portion 34 is configured to elastically contact a holding portion 35 provided outside the mounting groove 34.

  However, in such a conventional configuration, when the movable contact 9a is mounted in the mounting groove 34, the movable contact 9a may be bent too much and plastically deformed. Is a major factor for increasing the defect rate of the disconnect terminal block 1a.

  This invention is made | formed in view of this present condition, and aims at provision of the disconnecting terminal block which can be mounted | worn with a switch member, without damaging a movable contact.

  The present invention relates to a pair of conductive metal fittings having connecting portions for connecting lead wires, a short-circuit gap formed between the pair of conductive metal fittings, an elastically deformable conductive movable contact, and the movable contact The connection position where the movable contact is press-fitted into the short-circuit gap and the conductive fittings on both sides of the short-circuit gap are mutually short-circuited, and the conductive fitting on both sides of the short-circuit gap is separated by pulling out the movable contact In the disconnecting terminal block including the switch member that can be converted to the cutting position to be moved, the movable contact is folded back at the proximal end side so that the pair of elastic contact plate portions extending toward the distal end side are reduced in width. A leaf spring, which is mounted in a reduced width in a mounting groove formed in the switch member, and elastically contacts both elastic contact plates with a holding portion provided outside the mounting groove. Shorten the insertion end formed by the front end of the plate Further, it is configured to press fit into the gap, and further, at least one of the elastic contact plate portions of the movable contact is formed with a restricting portion extending toward the other elastic contact plate portion, and the restricting portion Is a disconnect terminal block that prevents the movable contact from contracting by striking the elastic contact plate on the other side in a state where the insertion end is contracted to a predetermined lower limit width.

  In such a configuration, by setting the lower limit width of the insertion end to a range in which the movable contact is not plastically deformed, it is not possible to reduce the width of the movable contact to a range in which plastic deformation occurs. It is possible to prevent the movable contact from being plastically deformed.

  In the present invention, a pair of engaging portions that extend in the direction of the elastic contact plate on the other side and engage in the direction in which the elastic contact plates separate from each other are provided on both elastic contact plates of the movable contact. A configuration is proposed in which the pair of engaging portions are engaged with each other in a state where the insertion end portions are reduced to a predetermined upper limit width, and the movable contact is locked so as not to widen.

  In such a configuration, the movable contact is locked in the contracted state by the engaging portion before being mounted on the switch member. Therefore, when the movable contact is mounted on the switch member, the movable contact is contracted. There is an advantage that the amount is small and the movable contact can be easily mounted. In such a configuration, the movable contact is locked in the contracted state, so that the movable contact is not plastically deformed in the widening direction until the switch member is mounted. Further, in such a configuration, by locking the movable contact in the reduced width state, there is an advantage that the variation in the width dimension that occurs when bending is suppressed and the width dimension of the insertion end can be made uniform. is there.

  In the present invention, it is proposed that at least one of the pair of engaging portions constitutes the restricting portion.

  In such a configuration, the engaging portion also serves as the restricting portion, whereby the restricting portion and the engaging portion according to the present invention can be realized with a simple configuration.

  In the present invention, the base end side of the movable contact is folded back in a U shape by a substantially flat flat portion and a pair of substantially arc-shaped curved portions provided on both sides of the flat portion. A configuration is proposed.

  In such a configuration, it is possible to increase the dimensional accuracy when bending the movable contact compared to the conventional movable contact 9a (see FIG. 10) folded back into a V shape by a single curved portion. Therefore, variation in the elastic force of the movable contact can be reduced.

  As described above, according to the present invention, by setting the lower limit width of the insertion end within a range in which the movable contact is not plastically deformed, the movable contact is plastically deformed when mounted on the switch member. Therefore, the defect rate of the disconnect terminal block can be reduced.

It is a front view of the disconnection terminal block 1 of the connection state which shows the resin-made board | substrate 3 longitudinally. It is a front view of the disconnection terminal block 1 of the cutting state which shows the resin-made board | substrate 3 longitudinally. It is a front view which cuts and shows the resin-made board | substrates 3 longitudinally. 3 is a perspective view of a switch member 2. FIG. It is a perspective view from the back side which shows switch member 2 and movable contact 9 separately. It is a perspective view of the movable contactor 9. It is a bottom view of movable contact 9, (a) shows the state of the upper limit width, and (b) shows the state contracted to the lower limit width. It is explanatory drawing which shows the mounting aspect of the movable contact 9 by cut | intersecting the switch member 2 longitudinally. It is a front view of the conventional disconnection terminal block 1a, (a) shows a connection state, (b) shows a cutting state. It is explanatory drawing which shows the mounting aspect of the conventional movable contact 9a.

  Embodiments of the present invention are described according to the following examples.

  As shown in FIGS. 1 and 2, the disconnecting terminal block 1 of the embodiment has a symmetrical thin plate shape and electrically connects the lead wires L connected to the left and right sides, respectively. The disconnecting terminal block 1 is arranged in a plurality of rows on a metal installation rail (not shown) in the same manner as the existing terminal block to constitute a collective terminal block. The disconnecting terminal block 1 is provided with a switch member 2 protruding in the upper center portion. The switch member 2 can be converted into a lower connection position α and an upper cut position β. When the switch member 2 is converted into the connection position α (see FIG. 1), leads connected to both sides are connected. When the line L is connected to each other and the switch member 2 is converted to the cutting position β (see FIG. 2), the lead wires L on both sides are electrically isolated from each other. .

  More specifically, the disconnecting terminal block 1 includes a symmetrical resin substrate 3 formed in a plate shape by an insulating resin material such as a modified PPO resin as a main part. As shown in FIG. 3, the resin substrate 3 has a seating groove surface 13 on which the switch member 2 and the like are mounted opened on the front side by projecting a defined wall 12 having a predetermined thickness from the back plate 11. It is formed. Further, connecting pieces 14 and 14 that engage with the installation rail are formed on the bottom of the resin substrate 3.

  The resin substrate 3 includes a conductive metal member 4 for connecting the lead wire L, an attachment screw 6 for fixing the lead wire L to the conductive metal member 4, a movable washer member 5 for holding the attachment screw 6, and the movable member. One compression coil spring 7 that biases the washer member 5 upward is provided on each of the left and right sides.

  The conductive metal fitting 4 is an L-shaped metal piece comprising a flat plate-like connecting portion 20 to which an end portion of a lead wire L is screwed and an abutting wall portion 21 extending downward from an inner end portion of the connecting portion 20. It is. The conductive metal fittings 4 are disposed at symmetrical positions on the resin substrate 3, and a vertical short-circuit gap 8 is formed between the contact wall portions 21 at the center of the resin substrate 3.

  The movable washer member 5 is a U-shaped metal piece having a mounting screw 6 inserted and mounted on the top thereof, and is held by the conductive metal fitting 4 so as to be movable up and down as shown in FIG. A lower position (right side in FIG. 1) where the end portion of the lead wire L is screwed to the connection portion 20, and an upper position (see FIG. 1) where the mounting screw 6 is retracted above the connection portion 20. 1 left side). Further, the movable washer member 5 is biased upward by the compression coil spring 7 and is held at the upper position when the mounting screw 6 is removed from the connection portion 20.

  When connecting the lead wire L to the disconnecting terminal block 1, the crimp terminal T at the end of the lead wire L is movable with the movable washer member 5 held at the upper position as shown on the left side of FIG. Insert between the washer member 5 and the connecting portion 20, then screw the mounting screw 6 into the connecting portion 20, and drop the crimp terminal T between the movable washer member 5 and the connecting portion 20 as shown on the right side of FIG. 1. Hold it impossible.

  As shown in FIGS. 1 and 2, the switch member 2 is a resin member that is long in the vertical direction, and is held in a vertical sliding groove 15 formed in the center of the resin substrate 3 to slide in the vertical direction. It is possible to move. Specifically, as shown in FIGS. 4 and 5, the switch member 2 is formed on the sliding portion 30 held in the sliding groove 15, and on the sliding portion 30. An operation portion 31 that protrudes upward and a mounting portion 32 that is formed under the sliding portion 30 and holds the movable contact 9 are provided. As shown in FIGS. A connecting position α where the movable contact 9 is press-fitted into the short-circuit gap 8 by pushing and pulling up and down, and a cutting position where the movable contact 9 is pulled out above the short-circuit gap 8 Conversion to β is possible.

  As shown in FIGS. 1 and 2, the switch member 2 includes a tongue-shaped opening / closing piece 33 extending from both side surfaces of the sliding portion 30. The front ends of the open / close pieces 33 are slidably held in the left and right guide grooves 16 formed on both upper sides of the resin substrate 3, and the open / close pieces 33 are guided at the connection position α of the switch member 2. It extends outward along the groove 16 and shields the head of the mounting screw 6 from above. On the other hand, at the cutting position β of the switch member 2, the opening / closing piece 33 is retracted into the sliding groove 15, the head of the mounting screw 6 is exposed upward, and the mounting screw 6 can be rotated with a screwdriver or the like.

  As shown in FIGS. 1 and 2, the movable contact 9 is a metallic leaf spring that is elastically deformed in the width-decreasing direction. At the connection position α of the switch member 2, the movable contact 9 is elastically contacted with the conductive fittings 4 and 4 on both sides. Short-circuit between the two conductive metal fittings 4. That is, at the connection position α of the switch member 2, the lead wires L connected to both sides are connected to each other via the conductive fittings 4 and the movable contact 9 on both sides. On the other hand, at the cutting position β of the switch member 2, the movable contact 9 is dropped from the short-circuit gap 8, whereby the conductive metal members 4 and 4 on both sides are divided by the short-circuit gap 8 and are connected to both sides. The lead wires L are insulated.

  Thus, when the switch member 2 is pushed down to the connection position α, the disconnecting terminal block 1 of the present embodiment enters a connection state in which the lead wires L on both sides are connected to each other, and when the switch member 2 is pulled up to the cutting position β, both sides The lead wires L are electrically disconnected from each other.

Below, the principal part of this invention is demonstrated.
As shown in FIGS. 5 to 7, the movable contact 9 is a leaf spring formed by bending one metal plate piece , and the base end portion 40 on the base end side (upper end side) is attached to the switch member 2. The insertion end 41 on the distal end side (lower end side) that is attached to the portion 32 and protrudes downward from the attachment portion 32 is inserted into the short-circuit gap 8. Specifically, the movable contactor 9 is folded back in a U shape at the base end portion 40 and has a pair of left and right elastic contact plate portions 42 and 42 extending from the base end portion 40 to the front end side. The insertion end portion 41 is formed by the tip side portions of both the elastic contact plate portions 42, and the movable contact 9 can be reduced in width in the direction in which the tip end portions of the two elastic contact plate portions 42 are brought close to each other. .

  As shown in FIGS. 6 and 7, hook-shaped restricting engagement portions 47, 47 extending in the direction of the other elastic contact plate portion 42 are bent at the tip of each elastic contact plate portion 42. The restricting engagement portions 47 and 47 limit the range in which the insertion end portion 41 is deformed between a predetermined upper limit width and a lower limit width. Specifically, as shown in FIG. 7A, both restriction engagement portions 47 are L-shaped in a bottom view, and one restriction engagement portion 47 is the front end of the elastic contact plate portion 42. The other restriction engaging portion 47 extends from the tip rear portion of the other elastic contact plate portion 42 and can be engaged in a direction in which the elastic contact plate portion 42 is separated. As shown in FIGS. 6 and 7 (a), the restricting engagement portions 47 and 47 are engaged with the insertion end 41 being contracted to a predetermined upper limit width, and the width of the movable contact 9 is increased. By resisting the resilience elasticity, the insertion end 41 is locked so as not to be wider than the upper limit width. That is, the restricting engaging portions 47, 47 constitute an engaging portion according to the present invention.

  Further, as shown in FIG. 7B, when the movable contact 9 is reduced in width until the insertion end 41 has a predetermined lower limit width, each restricting engagement portion 47 becomes the elastic contact plate portion on the other side. Thus, the movable contact 9 cannot be further reduced in width. This lower limit width is set to a range narrower than the short-circuit gap 8 and the movable contact 9 is not plastically deformed. For this reason, in this embodiment, even when the movable contact 9 is contracted with a strong force, the movable contact 9 is not plastically deformed. That is, the restriction engaging portion 47 constitutes a restriction portion according to the present invention.

  Before the movable contact 9 is attached to the switch member 2, the movable engagement member 9 is locked by the restriction engagement portion 47 in a state where the insertion end portion 41 is reduced to the upper limit width. As shown in FIGS. 5 and 8, the mounting portion 32 of the switch member 2 is formed with an inverted U-shaped mounting groove 34 that opens to the back side, and the movable contact 9 is mounted with the base end portion 40. The switch member 2 is mounted so as to fit in the groove 34 and cause the insertion end 41 to protrude below the mounting portion 32. Here, as shown in FIG. 8, the mounting groove 34 is formed to be narrower than the base end portion 40 (two-dot chain line in FIG. 8) before mounting, and the movable contact 9 is shown in FIG. As shown, the insertion end 41 is mounted in the mounting groove 34 in a state where the insertion end 41 is contracted to a width W2 narrower than the upper limit width W1. In such a mounting state, the movable contact 9 makes the elastic contact plate portion 42 elastically contact the holding portions 35, 35 formed on the outside of the mounting groove 34 by its restoring elasticity, so that the mounting contact 34 can be removed from the mounting groove 34. It will be held so as not to fall off.

  As shown in FIG. 8, the insertion end portion 41 has a maximum width at the front end portion 44, and is narrowed in a tapered shape from there toward the distal end. The movable contact 9 uses a portion 44 having the maximum width of the insertion end portion 41 as a contact portion that contacts the contact wall portion 21 of the conductive metal fitting 4, and a tapered portion 45 below the contact portion 44 is press-fitted into the short-circuit gap 8. The insertion end 41 is sometimes used as a guide for reducing the width. That is, the insertion end 41 is pulled out from the short-circuit gap 8, the insertion end 41 is narrower than the short-circuit gap 8, and the contact portion 44 is wider than the short-circuit gap 8. 8, the guide portion 45 abuts against the abutting wall portion 21 and exerts a guiding action, whereby the contact portion 44 is reduced to the width of the short-circuit gap 8, and the conductive metal fittings on both sides within the short-circuit gap 8. It is comprised so that 4 may be elastically contacted.

  As described above, the movable contact 9 according to the present embodiment is locked in a state where the insertion end 41 is reduced to the upper limit width W1 at the time of molding. Then, in a state of being mounted on the mounting portion 32, the insertion end portion 41 is contracted to a width W2 that is narrower than the upper limit width W1. Then, in the state of being press-fitted into the short-circuit gap 8, the insertion end portion 41 is contracted to the width of the short-circuit gap 8 and elastically contacts the contact wall portion 21 of the conductive metal fitting 4.

  Here, since the movable contact 9 is restricted by the restriction engagement portion 47 so that the insertion end 41 does not become smaller than the lower limit width, in this embodiment, when the movable contact 9 is mounted on the switch member 2. In addition, the movable contact 9 is not damaged by being contracted beyond the allowable range. Therefore, the disconnection terminal block 1 of the present embodiment has an advantage that the defect rate at the time of manufacture can be reduced as compared with the conventional configuration.

  In addition, the conventional movable contact 9a (see FIG. 10) may be plastically deformed in the widening direction or the narrowing direction by an external force between molding and mounting to the switch member 2. In the present embodiment, the movable contact 9 of the embodiment is not widened beyond the upper limit width of the insertion end portion 41 and is not narrowed below the lower limit width of the insertion end portion 41. This prevents the movable contact 9 from being plastically deformed and damaged before being attached to the switch member 2.

  In addition, since the movable contact 9 according to the present embodiment is locked in a state where the movable contact 9 is contracted to the upper limit width before mounting, the amount of contraction of the movable contact 9 when mounted on the switch member 2 is small. There is an advantage that it can be installed easily.

  Further, in this embodiment, the movable contact 9 is locked in a state where the insertion end portion 41 has the upper limit width, thereby suppressing variation in width dimension that occurs when bending is performed. There is an advantage that the width dimension can be made uniform.

  Further, in this embodiment, the hook-shaped restricting / engaging portion 47 bent at the tip of the elastic contact plate portion 42 constitutes both the restricting portion and the engaging portion according to the present invention. There is an advantage that the functions of the restricting portion and the engaging portion can be realized with a simple configuration.

  In the present embodiment, as shown in FIG. 8, the base end portion 40 of the movable contact 9 includes a flat portion 50 that is flat when viewed from the front, and a curved portion 51 that is curved in an arc shape on both sides of the flat portion 50. , 51 are folded back in a U-shape. Thus, the movable contactor 9 folded back in a U shape by the two curved portions 51 is bent compared to the conventional movable contactor 9a folded back in a V shape by a single curved portion (see FIG. 10). Since the dimensional error during processing is reduced and the variation in elastic force is reduced, there is an advantage that the movable contact 9 and the conductive metal fitting 4 can be elastically contacted stably with a uniform force.

  The disconnect terminal block of the present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit of the present invention. For example, the disconnecting terminal block 1 of the above embodiment fixes the lead wire L to the conductive metal fitting 4 with the mounting screw 6. However, in the present invention, the method of connecting the lead wire to the conductive metal fitting can be changed as appropriate. It is.

DESCRIPTION OF SYMBOLS 1,1a Disconnect terminal block 2,2a Switch member 3 Resin board 4 Conductive metal fitting 5 Movable washer member 6 Mounting screw 7 Compression coil spring 8 Short-circuit gap 9, 9a Movable contact 15 Sliding groove 20 Connection part 21 Contact wall part 30 Sliding part 31 Operating part 32 Mounting part 33 Opening and closing piece 34 Mounting groove 35 Holding part 40 Base end part 41 Insertion end part 42 Contacting plate part 44 Contact part 45 Guide part 47 Restriction engagement part 50 Flat part 51 Curved part α Connection Position β Cutting position L Lead wire

Claims (2)

A pair of conductive metal fittings having connecting portions for connecting lead wires;
A short-circuit gap formed between the pair of conductive metal fittings;
A conductive movable contact that is elastically deformable; and
Holding position of the movable contact, press-fitting the movable contact into the short-circuit gap and short-circuiting the conductive metal fittings on both sides of the short-circuit gap with each other; In a disconnecting terminal block comprising a switch member that can be converted into a cutting position that divides between metal fittings,
The movable contact is a leaf spring that is folded back at the base end side and contracts so that a pair of elastic contact plate portions extending toward the distal end are brought close to each other, and is contracted into a mounting groove formed in the switch member. The two elastic contact plates are elastically contacted to the holding portion provided outside the mounting groove, and the insertion end formed by the tip side portion of both elastic contact plates is press-fitted into the short-circuit gap. Configured and
Further, at least one of the elastic contact plate portions of the movable contact is formed with a restricting portion extending toward the other elastic contact plate portion, and the restricting portion has an insertion end portion reduced to a predetermined lower limit width. It strikes against the elastic contact plate on the other side in the widthed state, and prevents the movable contact from shrinking ,
A pair of engaging portions are formed on both elastic contact plate portions of the movable contact so as to extend in the direction of the elastic contact plate portion on the other side and engage in the direction in which both elastic contact plate portions are separated from each other,
The pair of engaging portions are engaged with each other in a state where the insertion end portions are contracted to a predetermined upper limit width, and are locked so that the movable contact does not widen . The disconnect terminal block according to claim 1 , wherein at least one of the pair of engaging portions constitutes the restricting portion.

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