JP7533280B2 - Screw retention structure, terminal block, and electrical equipment - Google Patents

Description

The present invention relates to a screw retention structure, and a terminal block and an electrical device equipped with the screw retention structure.

Conventionally, there has been known a wire connection method in which the tip of a wire inserted into a housing through a wire insertion port is pressed against a terminal portion provided inside the housing by a terminal screw in a direction intersecting the wire insertion direction, thereby electrically connecting the tip. In this wire connection method, a screw holding structure (also called a hold-on structure) that holds the terminal screw in a holding position away from the terminal portion is generally adopted to facilitate the insertion of the wire. One known example of such a screw holding structure is disclosed in Patent Document 1 (JP Patent Publication 2011-34735). Patent Document 1 discloses a screw holding structure that holds the terminal screw in a holding position away from the terminal portion by the biasing force of a coil spring having one end attached to a washer of the terminal screw.

JP 2011-34735 A

However, with the screw retention structure of Patent Document 1, when attaching a terminal screw to a terminal block or electrical equipment, it is necessary to attach the terminal screw in a compressed state of a long coil spring. This causes a problem of large displacement of the coil spring, making assembly difficult. In addition, when the compressed coil spring elastically returns to its original position, it may rebound in an unintended direction. For this reason, a member is required to regulate the rebound direction of the coil spring.

The object of the present invention is to solve the above problems by providing a new screw holding structure that can hold the terminal screw at a holding position away from the terminal without using a coil spring, and a terminal block and an electrical device equipped with the screw holding structure.

In order to achieve the above object, a screw holding structure according to one aspect of the present invention comprises:
A housing and
a terminal portion disposed within the housing and having a female screw portion;
a terminal screw including a male screw portion that can be screwed into the female screw portion, a head portion having a diameter larger than that of the male screw portion, a neck portion that axially connects the male screw portion and the head portion, and an annular washer disposed around the neck portion;
A leaf spring disposed within the housing;
Equipped with
the terminal screw is configured to be movable within the housing between a connection position where the male screw portion is screwed into the female screw portion to connect to the terminal portion and a holding position spaced apart from the terminal portion in the axial direction,
The leaf spring is configured such that one end thereof comes into face contact with the washer from the male threaded portion side and urges the terminal screw toward the holding position when the female threaded portion and the male threaded portion are released from the screwed engagement.

The screw holding structure according to one aspect of the present invention provides a novel screw holding structure that can hold a terminal screw at a holding position away from the terminal portion without using a coil spring.

1 is a perspective view of a push button switch having a screw connection structure according to an embodiment of the present invention; FIG. 2 is a cross-sectional view of the push button switch of FIG. 1 . 2 is a perspective view showing a state in which a front side housing part is removed from the push button switch of FIG. 1; 2 is a perspective view showing a state in which a rear housing part is removed from the push button switch of FIG. 1; FIG. 5 is a perspective view showing a state in which a plunger has been removed from the state shown in FIG. 4 . 1 is a perspective view of a terminal screw included in a screw connection structure according to an embodiment of the present invention; 1. FIG. 4 is a plan view showing a modification of the display unit included in the push button switch of FIG.

A screw holding structure according to one aspect of the present invention includes:
A housing and
a terminal portion disposed within the housing and having a female screw portion;
a terminal screw including a male screw portion that can be screwed into the female screw portion, a head portion having a diameter larger than that of the male screw portion, a neck portion that axially connects the male screw portion and the head portion, and an annular washer disposed around the neck portion;
A leaf spring disposed within the housing;
Equipped with
the terminal screw is configured to be movable within the housing between a connection position where the male screw portion is screwed into the female screw portion to connect to the terminal portion and a holding position spaced apart from the terminal portion in the axial direction,
The leaf spring is configured such that one end thereof comes into face contact with the washer from the male threaded portion side and urges the terminal screw toward the holding position when the female threaded portion and the male threaded portion are released from their screwed engagement.

With this configuration, one end of the leaf spring is in surface contact with the washer from the male thread side and is configured to urge the terminal screw toward the holding position, so that the leaf spring can apply a more balanced urging force to the washer. Furthermore, compared to a coil spring, a leaf spring is easier to control the rebound direction when it elastically returns from a curved state to a flat plate shape, and is easy to assemble. Therefore, with the above configuration, it is possible to provide a new screw holding structure that can hold the terminal screw at a holding position away from the terminal portion without using a coil spring.

The terminal screw may include an annular clamping member that clamps one end of the leaf spring between the washer and the clamping member. With this configuration, one end of the leaf spring can be held firmly between the washer and the clamping member, and the biasing force of the leaf spring can be applied to the washer in a more balanced manner. In addition, since the washer is interposed between the head of the terminal screw and the leaf spring, when the head is rotated with a screwdriver, the rotational force of the screwdriver is not directly applied to the leaf spring, and twisting of the leaf spring can be suppressed. In addition, since the clamping member is interposed between the terminal portion and the leaf spring on the male thread side of the terminal screw, it is possible to prevent the electric wire from contacting the leaf spring when inserting the electric wire between the terminal portion and the terminal screw.

The housing may also be provided with a groove into which the other end of the leaf spring is inserted to hold the leaf spring. This configuration can further improve assembly.

The device may also include a restricting member having an arc-shaped portion that is located between the terminal screw and the other end of the leaf spring and that contacts a portion between one end and the other end of the leaf spring when the terminal screw moves from the holding position to the connecting position to restrict the amount of bending of the leaf spring. With this configuration, the restricting member can prevent the leaf spring from bending excessively. For example, even if an impact is applied to the leaf spring due to an external force being applied to the housing when the terminal screw is in the connecting position and the amount of bending of the leaf spring is large, the amount of bending of the leaf spring can be prevented from becoming even larger.

The washer may have a first guide protrusion protruding toward the head side of the terminal screw, and the housing may have a first guide groove along which the first guide protrusion slides in the axial direction when the terminal screw moves between the connection position and the holding position. With this configuration, the first guide protrusion slides along the first guide groove to restrict the movement of the terminal screw in the axial direction, and the biasing force of the leaf spring can be applied to the washer in a more balanced manner.

The washer may have a second guide protrusion protruding toward the head at a position facing the first guide protrusion via the head when viewed from the axial direction, and the housing may have a second guide groove in which the second guide protrusion slides in the axial direction when the terminal screw moves between the connection position and the holding position. With this configuration, the first and second guide protrusions slide in the first and second guide grooves to more reliably restrict the movement of the terminal screw in the axial direction, and the biasing force of the leaf spring can be applied to the washer in a more balanced manner.

The washer may also have a protective member that protrudes toward the head side and is configured to conceal the leaf spring so that the leaf spring is not exposed in the path of movement of the terminal screw while the terminal screw moves between the connection position and the holding position. With this configuration, when the head of the terminal screw is rotated with a screwdriver, it is possible to prevent the screwdriver from accidentally coming out of the path of movement of the terminal screw and coming into contact with the leaf spring.

The protective member may be formed in a rod shape or a substantially rectangular plate shape with its longitudinal direction in the axial direction. This configuration allows for space-saving arrangement and is easy to fabricate.

The screw retention structure may also be provided on a terminal block or electrical equipment.

The following describes an embodiment of the present invention with reference to the drawings. Note that the present invention is not limited to this embodiment. In addition, substantially identical components in the drawings are given the same reference numerals.

In addition, for the sake of convenience, the following uses terms indicating directions such as "up," "down," "front," "rear," "left," and "right" assuming normal use, but are not intended to limit the use state of the screw holding structure according to the present invention.

(Embodiment)
A screw connection structure according to an embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a perspective view of a push button switch including a screw connection structure according to an embodiment of the present invention. The push button switch is an example of an electrical device.

The push button switch 1 according to this embodiment includes a housing 2 and a plunger 3. The housing 2 and the plunger 3 are made of insulating materials.

The housing 2 includes a front housing part 21 and a rear housing part 22. A through hole 23 is provided on the top surface of the housing 2, through which the plunger 3 can move in the up-down direction Z. The housing 2 is formed symmetrically when viewed from the front-to-rear direction Y (from the lower right to the upper left in FIG. 1). Wire insertion ports 24 through which wires (not shown) pass are formed on the left and right side surfaces of the housing 2.

The plunger 3 is a hollow rod body having a generally rectangular prism shape extending in the vertical direction Z. As shown in FIG. 1, the plunger 3 is housed inside the housing 2 such that the tip 31 protrudes to the outside of the housing 2 through the through hole 23. The tip 31 of the plunger 3 has chamfered corners in the left-right direction X and is formed into a generally arc shape when viewed from the front-back direction Y. In this embodiment, the left-right direction X, the front-back direction Y, and the vertical direction Z are mutually perpendicular.

Figure 2 is a cross-sectional view of the push button switch 1 of Figure 1. Figure 3 is a perspective view showing the push button switch 1 of Figure 1 with the front housing part 21 removed. Figure 4 is a perspective view showing the push button switch 1 of Figure 1 with the rear housing part 22 removed. Figure 5 is a perspective view showing the state shown in Figure 4 with the plunger 3 further removed. Figure 6 is a perspective view of the terminal screw.

As shown in Figures 2 to 5, a terminal portion 4, a terminal screw 5, and a leaf spring 6 are arranged inside the housing 2.

The terminal portion 4 is fixedly attached to the housing 2. The terminal portion 4 is made of a conductive material. In this embodiment, the terminal portion 4 is constructed by drilling and bending a single metal plate. The terminal portion 4 is provided with a female screw portion 41 that extends in the thickness direction. A fixed contact 42 is attached to one end of the terminal portion 4 located closer to the plunger 3.

The terminal screw 5 has a male threaded portion 51 that can be screwed into the female threaded portion 41, a head portion 52 that has a larger diameter than the male threaded portion 51, and a neck portion 53 that connects the male threaded portion 51 and the head portion 52 in the axial direction A1. The head portion 52 is provided with a screw groove portion 52a into which a screwdriver can be inserted. An annular washer 54 is disposed around the neck portion 53. In this embodiment, an annular clamping member 55 that clamps one end portion 6a of the leaf spring 6 between the washer 54 and the neck portion 53 is disposed around the neck portion 53. In this embodiment, the clamping member 55 is made of the same metal as the washer 54.

The terminal screw 5 is configured to be movable within the housing 2 between a connection position P1 where the male threaded portion 51 is screwed into the female threaded portion 41 to connect to the terminal portion 4, and a holding position P2 spaced apart from the terminal portion 4 in the axial direction A1. When an electric wire (not shown) is inserted through the electric wire insertion port 24, the terminal screw 5 is moved from the holding position P2 to the connection position P1, and presses a connection terminal (not shown) attached to the tip of the electric wire against the terminal portion 4. This electrically connects the connection terminal of the electric wire to the terminal portion 4.

The washer 54 has a first guide protrusion 56 that protrudes toward the head 52 of the terminal screw 5 and extends in the axial direction A1. The housing 2 has a first guide groove 25 in which the first guide protrusion 56 slides in the axial direction A1 when the terminal screw 5 moves between the connection position P1 and the holding position P2. In this embodiment, the washer 54 has a second guide protrusion 57 that protrudes toward the head 52 and extends in the axial direction A1 at a position facing the first guide protrusion 56 through the head 52 when viewed from the axial direction A1. The housing 2 has a second guide groove 26 in which the second guide protrusion 57 slides in the axial direction A1 when the terminal screw 5 moves between the connection position P1 and the holding position P2.

In this embodiment, the first guide protrusion 56 and the second guide protrusion 57 are provided at positions facing each other through the center of the head 52 when viewed from the axial direction A1. The first guide protrusion 56 and the second guide protrusion 57 are formed in a substantially rectangular plate shape with chamfered corners. The first guide groove 25 and the second guide groove 26 extend in the axial direction A1 to a position just before the outer surface of the housing 2. That is, one end of the first guide groove 25 and one end of the second guide groove 26 that are away from the terminal portion 4 are located inside the housing 2. The tip of the first guide protrusion 56 contacts one end of the first guide groove 25, thereby restricting the movement of the terminal screw 5 in the axial direction A1, and the terminal screw 5 is held at the holding position P2. The tip of the second guide protrusion 57 contacts one end of the second guide groove 26, thereby restricting the movement of the terminal screw 5 in the axial direction A1, and the terminal screw 5 is held at the holding position P2.

The washer 54 also has a protective member 58 that protrudes toward the head 52 and is configured to conceal the leaf spring 6 so that the leaf spring 6 is not exposed in the movement path of the terminal screw 5 while the terminal screw 5 moves between the connection position P1 and the holding position P2. In this embodiment, the protective member 58 has a longitudinal direction in the axial direction A1 and is formed into a substantially rectangular plate shape with chamfered corners. The length of the protective member 58 in the axial direction A1 is longer than the distance between the connection position P1 and the holding position P2. In this embodiment, the protective member 58 is provided so as to protrude outside the housing 2 when the terminal screw 5 is located at the holding position P2 (see the protective member 58 on the right side of FIG. 2). As a result, the protective member 58 functions as an indicator that provides a different visual indicator when the terminal screw 5 is located at the connection position P1 and when it is located at the holding position P2.

The leaf spring 6 is configured so that one end 6a comes into surface contact with the washer 54 from the male threaded portion 51 side, and urges the terminal screw 5 toward the holding position P2 when the female threaded portion 41 and the male threaded portion 51 are released from the screwing engagement. A groove portion 27 is provided in the housing 2 into which the other end 6b of the leaf spring 6 is inserted to hold the leaf spring 6.

A restricting member 28 is provided between the terminal screw 5 and the other end 6b of the leaf spring 6. The restricting member 28 has an arc-shaped portion 28a that contacts the portion between one end 6a and the other end 6b of the leaf spring 6 when the terminal screw 5 moves from the holding position P2 to the connecting position P1, and restricts the amount of bending of the leaf spring 6.

A movable contact 32 is provided at a position facing the fixed contact 42 of each terminal portion 4 so as to be movable in the up-down direction Z. The movable contact 32 is provided on a contact arm 33 extending in the left-right direction X. The contact arm 33 is made of a conductive material. A hemispherical protrusion 34 that protrudes upward is provided at the center of the contact arm 33. The lower end of a first coil spring 35 is attached to the protrusion 34. The upper end of the first coil spring 35 is attached to the plunger 3.

As shown in FIG. 5, a second coil spring 36 is provided on the side closer to the rear housing part 22 than the first coil spring 35. The lower end of the second coil spring 36 is attached to a boss 29 that protrudes upward from the inner bottom surface of the housing 2. The upper end of the second coil spring 36 is attached to the plunger 3, and biases the plunger 3 upward. The second coil spring 36 is configured to be longer than the first coil spring 35.

When the plunger 3 is pressed downward against the biasing force of the first coil spring 35 and the second coil spring 36, the contact arm 33 moves downward and the movable contact 32 comes into contact with the fixed contact 42. When the wires are inserted into the left and right wire insertion ports 24 of the housing 2, and the connection terminals of the wires are electrically connected to the terminal portion 4 by the terminal screws 5, the movable contact 32 and the fixed contact 42 are electrically connected, and the wires are electrically connected. This brings the push button switch 1 into the on state. When the pressing force of the plunger 3 is released from this state, the compressed first coil spring 35 and second coil spring 36 elastically return to their original position, causing the plunger 3 to move upward and separating the movable contact 32 and the fixed contact 42. This brings the push button switch 1 into the off state.

According to this embodiment, one end 6a of the leaf spring 6 is in surface contact with the washer 54 from the male screw portion 51 side, and is configured to bias the terminal screw 5 toward the holding position P2. This allows the leaf spring 6 to apply a more balanced biasing force to the washer 54. Furthermore, compared to a coil spring, the leaf spring 6 is easier to control the rebound direction when elastically returning from a curved state to a flat plate shape, and is easy to assemble. Therefore, according to the above configuration, it is possible to provide a novel screw holding structure that can hold the terminal screw 5 at the holding position P2 away from the terminal portion 4 without using a coil spring. Furthermore, the leaf spring 6 is generally cheaper than a coil spring, and can contribute to reducing the manufacturing cost of the push button switch 1.

In addition, according to this embodiment, the terminal screw 5 is provided with an annular clamping member 55 that clamps one end 6a of the leaf spring 6 between the washer 54. This allows one end 6a of the leaf spring 6 to be firmly held between the washer 54 and the clamping member 55, and the biasing force of the leaf spring 6 can be applied to the washer 54 in a more balanced manner. In addition, since the washer 54 is interposed between the head 52 of the terminal screw 5 and the leaf spring 6, when the head 52 is rotated with a screwdriver, the rotational force of the screwdriver is not directly applied to the leaf spring 6, and twisting of the leaf spring 6 can be suppressed. In addition, since the clamping member 55 is interposed between the terminal portion 4 and the leaf spring 6 on the male screw portion 51 side of the terminal screw 5, it is possible to suppress the electric wire from contacting the leaf spring 6 when inserting the electric wire between the terminal portion 4 and the terminal screw 5.

In addition, according to this embodiment, a groove 27 is provided in the housing 2 into which the other end 6b of the leaf spring 6 is inserted to hold the leaf spring 6. This can further improve assembly.

In addition, according to this embodiment, a restricting member 28 having an arc-shaped portion 28a that restricts the amount of bending of the leaf spring 6 is provided. This allows the restricting member 28 to prevent the leaf spring 6 from bending excessively. For example, even if the leaf spring 6 is subjected to an impact due to an external force being applied to the housing 2 when the terminal screw 5 is located at the connection position P1 and the amount of bending of the leaf spring 6 is large, the amount of bending of the leaf spring 6 can be prevented from becoming even larger.

In addition, according to this embodiment, the washer 54 has a first guide protrusion 56 that protrudes toward the head 52 of the terminal screw 5, and the housing 2 has a first guide groove 25 along which the first guide protrusion 56 slides in the axial direction A1. As a result, the first guide protrusion 56 slides along the first guide groove 25 to restrict the movement of the terminal screw 5 in the axial direction A1, and the biasing force of the leaf spring 6 can be applied to the washer 54 in a more balanced manner. In addition, the first guide protrusion 56 slides along the first guide groove 25 to restrict the movement of the terminal screw 5 in the axial direction A1, making it easier to recognize the amount of movement of the terminal screw 5.

In addition, according to this embodiment, the washer 54 has a second guide protrusion 57 that protrudes toward the head 52 at a position facing the first guide protrusion 56 through the head 52 when viewed from the axial direction A1. The housing 2 also has a second guide groove 26 in which the second guide protrusion 57 slides in the axial direction A1 when the terminal screw 5 moves between the connection position P1 and the holding position P2. This allows the first guide protrusion 56 and the second guide protrusion 57 to slide in the first guide groove 25 and the second guide groove 26, thereby more reliably restricting the movement of the terminal screw 5 in the axial direction A1. Therefore, the biasing force of the leaf spring 6 can be applied to the washer 54 in a more balanced manner. In addition, the amount of movement of the terminal screw 5 can be more easily recognized, and the visibility of whether the terminal screw 5 is located at the holding position P2 can be improved.

In addition, according to this embodiment, the washer 54 has a protective member 58 that protrudes toward the head 52 and is configured to conceal the leaf spring 6 so that the leaf spring 6 is not exposed in the movement path of the terminal screw 5 while the terminal screw 5 moves between the connection position P1 and the holding position P2. This prevents the screwdriver from accidentally coming out of the movement path of the terminal screw 5 and coming into contact with the leaf spring 6 when the head 52 of the terminal screw 5 is rotated with a screwdriver.

In addition, according to this embodiment, the protective member 58 is a protrusion provided on the washer 54 so as to be located inside the housing 2 when the terminal screw 5 is located at the connection position P1, and to protrude outside the housing 2 when the terminal screw 5 is located at the holding position P2. As a result, when the terminal screw 5 is located at the holding position P2, the protective member 58 protrudes outside the housing 2, making it easy to recognize the protective member 58 at a glance and improving visibility as to whether the terminal screw 5 is located at the holding position P2.

In addition, according to this embodiment, the protective member 58 is formed in a substantially rectangular plate shape with its longitudinal direction in the axial direction A1, so it can be placed in a space-saving manner and is easy to manufacture.

The present invention is not limited to the above embodiment, and can be embodied in various other forms. For example, in the above, the screw connection structure according to the present invention is provided in the push button switch 1, but the present invention is not limited to this. The screw connection structure according to the present invention is applicable to devices that employ a wire connection method in which the tip of the wire inserted into the inside of the housing 2 through the wire insertion port 24 is pressed against the terminal portion 4 by the terminal screw 5 to electrically connect the wire. Examples of such devices include electrical equipment such as operating switches and indicator lights, and terminal blocks.

In the above description, the first guide protrusion 56, the second guide protrusion 57, and the protective member 58 are formed in a substantially rectangular plate shape, but the present invention is not limited to this. For example, the first guide protrusion 56, the second guide protrusion 57, and the protective member 58 may be formed in a rod shape such as a polygonal prism.

In the above, the protective member 58 functions as an indicator that provides different visual indicators when the terminal screw 5 is located at the connection position P1 and when it is located at the holding position P2, but the present invention is not limited to this. For example, as shown in FIG. 7, an indicator 7 having a different color or material from other parts may be provided at the lower end of the first guide groove portion 25 that constitutes a part of the wall surface that forms the movement path of the terminal screw 5. According to this configuration, when the terminal screw 5 is located at the connection position P1, the indicator 7 is visible from outside the housing 2. On the other hand, when the terminal screw 5 is located at the holding position P2, the indicator 7 is not visible from outside the housing 2. Therefore, by checking the color or material of the wall surface that forms the movement path of the terminal screw 5, it is possible to check whether the terminal screw 5 is located at the holding position P2, and the visibility can be improved.

In addition, any of the various embodiments described above can be appropriately combined to achieve the effects of each.

Although the present invention has been fully described in connection with the preferred embodiment with reference to the accompanying drawings, various changes and modifications will be apparent to those skilled in the art. Such changes and modifications are to be understood as included within the scope of the present invention as defined by the appended claims unless they depart therefrom.

The screw holding structure of the present invention provides a new screw holding structure that can hold the terminal screw at a holding position away from the terminal portion without using a coil spring, and is therefore useful for terminal blocks and electrical devices that employ a wire connection method using terminal screws.

REFERENCE SIGNS LIST 1 Push button switch 2 Housing 3 Plunger 4 Terminal portion 5 Terminal screw 6 Leaf spring 6a One end portion 6b Other end portion 7 Display portion 21 Front housing part 22 Rear housing part 23 Through hole 24 Electric wire insertion opening 25 First guide groove portion 26 Second guide groove portion 27 Groove portion 28 Restricting member 28a Arc-shaped portion 29 Boss 31 Tip portion 32 Movable contactor 33 Contact arm portion 34 Projection portion 35 First coil spring 36 Second coil spring 41 Female thread portion 42 Fixed contactor 51 Male thread portion 52 Head portion 52a Thread groove portion 53 Neck portion 54 Washer 55 Clamping member 56 First guide protrusion portion 57 Second guide protrusion portion 58 Protective member A1 Axial direction P1 Connection position P2 Holding position

Claims (9)

A housing and
a terminal portion disposed within the housing and having a female screw portion;
a terminal screw including a male screw portion that can be screwed into the female screw portion, a head portion having a diameter larger than that of the male screw portion, a neck portion that axially connects the male screw portion and the head portion, and an annular washer disposed around the neck portion;
A leaf spring disposed within the housing;
Equipped with
the terminal screw is configured to be movable within the housing between a connection position where the male screw portion is screwed into the female screw portion to connect to the terminal portion and a holding position spaced apart from the terminal portion in the axial direction,
the leaf spring is configured such that one end portion is in surface contact with the washer from the male screw portion side and biases the terminal screw toward the holding position when the female screw portion and the male screw portion are released from screwing engagement with each other ,
a restricting member having an arc-shaped portion that is located between the terminal screw and the other end of the leaf spring and that contacts a portion between one end and the other end of the leaf spring when the terminal screw moves from the holding position to the connection position, thereby restricting the amount of bending of the leaf spring . A housing and
a terminal portion disposed within the housing and having a female screw portion;
a terminal screw including a male screw portion that can be screwed into the female screw portion, a head portion having a diameter larger than that of the male screw portion, a neck portion that axially connects the male screw portion and the head portion, and an annular washer disposed around the neck portion;
A leaf spring disposed within the housing;
Equipped with
the terminal screw is configured to be movable within the housing between a connection position where the male screw portion is screwed into the female screw portion to connect to the terminal portion and a holding position spaced apart from the terminal portion in the axial direction,
the leaf spring is configured such that one end portion is in surface contact with the washer from the male screw portion side and biases the terminal screw toward the holding position when the female screw portion and the male screw portion are released from screwing engagement with each other ,
The washer has a protective member protruding toward the head side and configured to conceal the leaf spring so that the leaf spring is not exposed in the movement path of the terminal screw while the terminal screw moves between the connection position and the holding position. The screw holding structure according to claim 2 , wherein the protective member is formed in a rod shape or a substantially rectangular plate shape. The screw holding structure according to claim 1 , wherein the terminal screw includes an annular clamping member that clamps one end of the leaf spring between the terminal screw and the washer. The screw holding structure according to claim 1 , wherein a groove is provided in the housing, into which the other end of the leaf spring is inserted to hold the leaf spring. the washer has a first guide protrusion protruding toward a head side of the terminal screw,
the housing has a first guide groove portion in which the first guide protrusion portion slides in the axial direction when the terminal screw moves between the connection position and the holding position;
The screw holding structure according to any one of claims 1 to 5 . the washer has a second guide protrusion protruding toward the head at a position opposite to the first guide protrusion across the head when viewed in the axial direction,
7. The screw holding structure according to claim 6 , wherein the housing has a second guide groove portion in which the second guide protrusion portion slides in the axial direction when the terminal screw moves between the connection position and the holding position. A terminal block comprising the screw holding structure according to any one of claims 1 to 7 . An electrical device comprising the screw holding structure according to any one of claims 1 to 7 .

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