JPH06264914A - Part mounting device - Google Patents

Abstract

PURPOSE:To prevent a screw and a screw drop prevention device from dropping by holding an inserting hole for inserting the top end part of the screw into a mounting member and a screw drop prevention device for holding a head part of it to hold the screw movably and rotatably in axial direction on the mounting member. CONSTITUTION:A screw 14 is held on a mounting member 13 movably and rotatably in axial direction by an inserting hole 28 for the mounting member 13 and a screw drop prevention device 41. By this, the top end part of the screw 14 can be held so that it is not protruded from the mounting member 13. Also, at installation, a screwdriver 23 is engaged with a head part 32 of the screw 14 through an opening part 48 of the screw drop prevention device 41, and the screw 14 is rotated in tightening direction to screw it into a part to be mounted 12, and to move the screw 14 in the direction of the mounting member 13 for installation. Then, at removal, the screw 14 is rotated in unscrewing direction with the screwdriver 23 to remove it from the part to be mounted, thus holding the screw 14 by the inserting hole 28 and screw drop prevention device 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component mounting device for mounting a mounting member to a mounted portion with a screw.

[0002]

2. Description of the Related Art Conventionally, for example, in an electric device, as shown in FIG. 12, with the outer side of the device covered with a case 1, a mounting member 3 is attached to a frame 2 in the case 1 with a screw 4. A component mounting structure that is designed to be finally mounted may be used.

In the mounting work in this component mounting structure, for example, the head portion 4a of the screw 4 is fitted to the tip portion of the driver 5 having magnetic coupling property to magnetically couple the tip portion of the screw 4 to the window hole 1a of the case 1. And the insertion member 3 is inserted into the insertion hole 3a of the mounting member 3 and pressed against the screw hole 2a of the frame 2, and the screw 4 is rotated in the screwing direction to be screwed into the screw hole 2a. Tighten and fix to. In addition, at the time of removal work, contrary to the time of mounting, the screw 4 is rotated in the screw release direction by the driver 5 to remove the screw from the screw hole 2a, and the screw 4 is taken out to the outside of the case 1 through the window hole 1a. .

In the case of such a component mounting structure, even when the driver 5 having magnetic coupling property is used when the screw 4 is attached or detached,
The screw 4 may come off from the driver 5 and drop, and particularly if the screw 4 drops between the case 1 and the mounting member 3, it becomes difficult to pick up the screw 4, and the dropped screw may be a conductive material such as a circuit board of a device. There is a problem that short-circuit accidents may occur if they come into contact with parts.

Further, as described in, for example, Japanese Utility Model Laid-Open No. 2-38514, a screw fall prevention tool for covering the head of a screw is attached to a mounting member with a double-sided adhesive tape, and the screw fall prevention tool is used to attach the screw head. There is a mounting structure in which a portion is pressed against a mounting member and is rotatably held in advance to prevent a screw from falling.

However, in this screw drop prevention tool, since the head of the screw is simply rotatably held while being pressed against the mounting member, the tip of the screw projects from the mounting member toward the frame, The frame and the mounting member cannot be combined in a joined state before mounting, that is, they cannot be applied to the mounting structure of FIG. 12, and when the screw is unscrewed, the head of the screw separates from the mounting member. There is a problem in that the double-sided adhesive tape is peeled off and the screw fall prevention device itself falls due to the double-sided adhesive tape peeling off.

[0007]

As described above, even if the conventional screw drop prevention tool is used, as shown in FIG. 12, the mounting member and the mounted portion are combined in a joined state before the screw mounting. There is a problem that it cannot be applied to the structure, and that the screw fall prevention device itself falls due to an excessive force applied to the screw fall prevention device when the screw is removed.

The present invention has been made in view of the above circumstances, and holds a screw on a mounting member in such a manner that the screw can be moved and rotated in the axial direction to ensure that the screw and the screw fall prevention tool fall. It is an object of the present invention to provide a component mounting device that can be prevented.

[0009]

According to the present invention, a screw is inserted into an insertion hole provided in a mounting member, and the mounting member is fixed to the mounted portion by the screw, and the screw is fixed to the mounting member. The screw head side is held so that it can be moved and rotated in the axial direction, and an opening that faces the end surface of the screw head and that cannot be inserted on the head side and that allows a screw mounting tool to be inserted is provided. A screw fall prevention tool is provided, and the mounting member holds the screw by the insertion hole into which the tip side of the screw is inserted and the screw fall prevention tool that holds the head side of the screw.

[0010]

In the present invention, the screw is held in the mounting member by the insertion hole of the mounting member and the screw drop preventing tool so as to be movable and rotatable in the axial direction. Therefore, the tip of the screw can be held in a state where it does not protrude from the mounting member, and it can be applied to a mounting structure in which the mounting member and the mounted portion are combined in a joined state before mounting the screw.

At the time of mounting, the mounting tool is engaged with the head of the screw through the opening of the screw drop prevention tool, and the screw is rotated in the screwing direction to be screwed into the mounted portion. The screw moves in the direction of the mounting member to mount the mounting member on the mounted portion. In addition, at the time of removal, by rotating the screw in the unscrewing direction with the mounting tool and removing it from the mounted part, the screw moves in the direction away from the mounting member, and the screw head prevents the screw from falling. The screw is held by the mounting member by the insertion hole and the screw fall prevention tool.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the first embodiment of the component mounting apparatus of the present invention will be described below with reference to FIGS.

The component mounting device is such that the outside of the electric device is a case.
With the structure covered with 11, the mounting member 13 is finally mounted to the mounted portion 12 such as the frame in the case 11 with the screw 14.

The case 11 has an upper surface portion 21 and a side surface portion 22.
The side surface portion 22 is formed with a window hole 24 through which at least a tip portion of a driver 23 as a mounting tool for rotating the screw 14 can be inserted.

In the attached portion 12, a screw hole 26 into which a screw 14 is screwed is formed in a mounting portion 25 for mounting the mounting member 13,
An introduction portion 27 is formed at the open end of the screw hole 26 so as to expand outward in a tapered shape.

The mounting member 13 is formed in a plate shape, and an insertion hole 28 having a diameter larger than that of a screw shaft portion 31 of the screw 14 which will be described later is formed so as to face the screw hole 26 of the mounting portion 25 substantially coaxially. Hole 28
A screw hole 29 is formed in a lower position of the screw hole 29, and a pair of holding holes 30 is formed in both lower positions of the screw hole 29.

The screw 14 has a screw shaft portion 31 on which a spiral screw is formed, and a head provided at one end of the screw shaft portion 31.
The head 32 has an engaging recess 33 with which the tip of the driver 23 is engaged. The screw shaft 31 has a head
A spring washer 34 of approximately the same diameter as 32 and a ring-shaped washer 35 of a larger diameter than the head 32 are fitted.
Reference numeral 35 is fitted in a state in which movement of the screw shaft portion 31 from the position shown in FIG.

In addition, the screw 14 is prevented by the screw drop prevention tool 41.
Are held by the mounting member 13. This screw drop prevention tool 41
Made of steel wire such as piano wire
A pair of insertion line portions 42 that are inserted into the respective holding holes 30 are formed, and a pair of attachment line portions 43 that are joined and attached from the insertion line portions 42 to the outer surface of the attachment member 13 are formed by bending. From the mounting wire 43 to the head side of the screw 14 (head 32, spring washer
A pair of substantially U-shaped holding portions 44 for fitting and holding (including 34 and washers 35) are formed by bending, and the connecting wire portions 45 that join the both holding portions 44 and are joined to the outer surface of the mounting member 13. Is bent.

Each holding portion 44 includes a mounting wire portion 43 and a connecting wire portion.
A pair of upper and lower guide line portions 46 are formed in parallel with each other from 45, and a regulation line portion 47 is formed by connecting the tips of the pair of guide line portions 46, and between the regulation line portions 47 on both sides. Opening 48
Are formed. The screw 14 having the head portion fitted between the holding portions 44 holds the washer 35 movably in the axial direction while being guided by the four guide wire portions 46, and the washer 35 is restricted by the regulation line portion 47. The abutting portion 49 facing the mounting member 13 is abutted to restrict the outward movement away from the mounting member 13.

Further, the screw drop prevention tool 41 has a mounting wire portion 43
Both ends of the mounting plate 50 are applied to the outer surface side of the mounting plate 50, and the fixing screw 52 is screwed into the screw hole 29 of the mounting member 13 through the through hole 51 at the center of the mounting plate 50 and fixed to the mounting member 13. There is.

The distance between the openings 48 of the screw drop prevention tool 41 is A, the diameter of the head 32 of the screw 14 is B, the diameter of the washer 35 is C, the diameter of the tip of the driver 23 is D, and the screw 14 is If the minimum distance from the center position to the guide line portion 46 is E, then E ≧ C
/ 2 and D <B <A <C. Due to this dimensional relationship, the washer 35 on the head side of the screw 14 is the guide wire part on all sides.
Guided by 46, it is movable in the axial direction and the screw
The head 32 of 14 is inserted through the opening 48, but the washer 35 abuts the abutting portion 49 of the regulation line portion 47 to restrict outward movement away from the mounting member 13, and the screw 14 is screwed. The driver 23 that operates in combination can be inserted through the opening 48.

Further, the distance from the contact portion 49 of the screw drop prevention device 41 to the outer surface of the mounting member 13 is L1, the distance from the outer surface of the washer 35 to the tip of the screw shaft portion 31 is L2, and the screw fall prevention device is
Letting L3 be the distance from the abutting portion 49 of 41 to the open end of the screw hole 26, there is a relationship of L1 <L2 <L3. From this dimensional relationship, in the screw 14, the tip of the screw shaft portion 31 is screwed into the screw hole 26 when the washer 35 is in contact with the contact portion 49 of the screw drop prevention tool 41.
Located in the insertion hole 28 of the mounting member 13 separated from
It is held by an insertion hole 28 that holds the tip of the screw shaft portion 31 and a screw drop prevention tool 41 that holds the head side of the screw 14.

Next, the operation of this embodiment will be described.

First, in order to hold the screw 14 on the mounting member 13, the tip end of the screw shaft portion 31 of the screw 14 is inserted into the insertion hole of the mounting member 13.
Insert into 28 and screw head side of screw 14
It is fitted in the holding portion 44 of 41, inserts each insertion wire portion 42 of the screw drop prevention tool 41 into each holding hole 30 of the mounting member 13, and presses the mounting plate 50 against the pair of mounting wire portions 43 to fix it. The screw 52 is screwed into the screw hole 30 of the mounting member 13 through the mounting plate 50, and is fixed by tightening.

Then, the mounting member 13 in which the screw 14 is held on the end surface of the mounting portion 25 of the mounted portion 12 is assembled in a joined state, and the equipment such as the mounted portion 12 and the mounting member 13 is covered to cover the case 11. assemble.

In order to mount the mounting member 13 on the mounted portion 12 with the case 11 covered, the tip of the driver 23 is engaged with the head 32 of the screw 14 through the window hole 24 of the case 11, The screw 14 is pushed as it is to push the tip end of the screw shaft portion 31 against the screw hole 26 of the mounted portion 12. At this time, screw 14
Since the tip end side of the screw shaft portion 31 is guided by the insertion hole 28 of the mounting member 13 and the head side is guided by the four guide wire portions 46 of the screw drop prevention tool 41, the screw 14 moves in parallel in the axial direction. Then, the tip end of the screw shaft portion 31 is reliably pressed against the screw hole 26. Further, rotate the screw 14 in the screwing direction to
By screwing 31 into the screw hole 26, the screw 14 moves toward the mounting member 13, and as shown in FIG. 3, the mounting member 13 is tightened and fixed to the mounted portion 12 with the screw 14.

To remove the mounting member 13 from the mounted portion 12, the driver 23 is engaged with the head 32 of the screw 14 through the window hole 24 of the case 11 and the opening 48 of the screw drop prevention tool 41.
The screw shaft portion 31 is unscrewed from the screw hole 26 of the mounted portion 12 by rotating the screw 14 in the screw releasing direction to remove it. As the screw shaft portion 31 is unscrewed from the screw hole 26, the screw 14 moves outward away from the mounting member 13, and the screw 14 is inserted between the insertion hole 28 and the screw fall prevention tool 41. Retained.

As described above, since the screw 14 is held in the mounting member 13 in the axially movable state by the insertion hole 28 of the mounting member 13 and the screw fall prevention tool 41, the tip end of the screw shaft portion 31 is It can be held without protruding from the mounting member 13 and can be applied to a mounting structure in which the mounted part 12 and the mounting member 13 are combined in a joined state before screw mounting, and the screw drops when the screw 14 is removed. It is possible to prevent the screw 14 and the screw fall prevention device 41 from falling without applying an excessive force to the prevention device 41.

Since the screw drop prevention tool 41 is formed of a wire rod, even after the screw drop prevention tool 31 is attached to the mounting member 13, the screw shaft portion 31 of the screw 14 is inserted between the holding portions 44. The head portion side of the screw 14 can be fitted by elastically widening the space between the holding portions 44.

Next, the construction of the second embodiment of the component mounting apparatus of the present invention will be described with reference to FIGS.

In the mounting member 13, at a position below the insertion hole 28,
A screw hole 61 is formed, and a protrusion 62 that protrudes to the outer surface side of the mounting member 13 is formed.

The screw drop prevention tool 41 is made of a metal plate material and has a mounting plate portion 71 joined and mounted to the mounting member 13. The mounting plate portion 71 is bent outward at a substantially right angle to form a horizontal plate. A portion 72 is formed, and a vertical plate portion 73 is formed by bending the horizontal plate portion 72 upward at a substantially right angle. The mounting plate portion 71 is formed with a mounting hole 75 through which the fixing screw 74 screwed into the screw hole 61 of the mounting member 13 is inserted, and
A fitting hole 76 that fits into the protrusion 62 of 13 is formed. A circular opening 48 that is substantially coaxial with the insertion hole 28 is formed in the vertical plate portion 73.

The inner diameter of the opening 48 of the screw drop prevention tool 41 is A, the diameter of the head 32 of the screw 14 is B, the diameter of the washer 35 is C, the diameter of the tip of the driver 23 is D, and the diameter of the screw 14 is If the minimum distance from the center position to the horizontal plate portion 72 is E, then E ≧ C
/ 2 and D <B <A <C. From this dimensional relationship, the head side of the screw 14 allows the head 32 of the screw 14 to pass through the opening 48 and move in the axial direction, and the washer 35.
Is abutted against the vertical plate portion 73 to restrict outward movement away from the mounting member 13, and a driver 23 for screwing the screw 14 can be inserted through the opening 48.

Further, the distance from the inner surface of the vertical plate portion 73 of the screw drop prevention tool 41 to the outer surface of the mounting member 13 is L1, and the washer 35.
Let L2 be the distance from the outer surface to the tip of the screw shaft portion 31 and L3 be the distance from the inner surface of the vertical plate portion 73 to the open end of the screw hole 26, then L1 <L2 <L3. Due to this dimensional relationship, the screw 14 has the washer 35 at the contact portion of the screw drop prevention tool 41.
49, the tip of the screw shaft 31 is
The insertion hole 28 of the mounting member 13 separated from the screw hole 26 and holding the tip of the screw shaft portion 31 and the screw fall prevention tool 41 holding the head side of the screw 14. Held by

Next, the operation of the second embodiment will be described.

To hold the screw 14 on the mounting member 13,
Insert the tip of 14 into the insertion hole 28 of the mounting member 13, fit the head 32 of the screw 14 into the opening 48 of the screw fall prevention device 41, and fit the mounting plate portion 71 of the screw fall prevention device 41. The fitting hole 76 is fitted into the protrusion 62 of the mounting plate portion 13, and the fixing screw 74 is screwed into the screw hole 61 of the mounting member 13 through the mounting hole 75 of the mounting plate portion 71 to be fixed by tightening.

Then, in order to mount the mounting member 13 on the mounted portion 12 with the case 11 covered, the tip of the driver 23 is engaged with the head 32 of the screw 14 through the window hole 24 of the case 11, The screw 14 is pushed as it is to push the tip end of the screw shaft portion 31 against the screw hole 26 of the mounted portion 12. When the tip of this screw shaft portion 31 is pressed against the screw hole 26, the head of the screw 14
32 is fitted in the opening 48 of the screw drop prevention tool 41. Further, by rotating the screw 14 in the screwing direction to screw the screw shaft portion 31 into the screw hole 26, the screw 14 moves toward the mounting member 13, and as shown in FIG. A mounting member (13) is fixed to the mounted portion (12) by tightening.

In order to remove the mounting member 13 from the mounted portion 12, the driver 23 is engaged with the head 32 of the screw 14 through the window hole 24 of the case 11 and the opening 48 of the screw drop prevention tool 41.
The screw shaft portion 31 is unscrewed from the screw hole 26 of the mounted portion 12 by rotating the screw 14 in the screw releasing direction to remove it. As the screw shaft portion 31 is unscrewed from the screw hole 26, the screw 14 moves outward away from the mounting member 13, and the screw shaft portion 31 moves into the screw hole 26.
The head 32 is fitted into the opening 48 of the screw drop prevention tool 41 before it is disengaged from, and the screw 14 is held between the insertion hole 28 and the screw drop prevention tool 41.

Next, the construction of the third embodiment of the component mounting apparatus of the present invention will be described with reference to FIGS. 8 and 9.

The mounting portion 25 of the mounted portion 12 is formed in a cylindrical shape having a diameter slightly larger than that of the washer 35 of the screw 14. Also,
In the mounting member 13, three fixing holes 81 are formed on the outer periphery of the mounting portion 25 around the insertion hole 28 at concentric circles at equal angles.

The screw drop prevention tool 41 is made of plastic,
It is composed of a ring member 91 and three leg members 92. The ring member 91 has an opening 48 formed in the center thereof, three protrusions 93 projecting from the periphery at equal angles, and a spherical bulge 94 is formed at the tip of each protrusion 93. The leg member 92 has a substantially C-shaped engaging portion 95 that engages with the protrusion 93 at one end, and a small diameter portion 96 that is inserted into the fixing hole 81 of the mounting member 13 at the other end.
The small-diameter portion 96 is formed with a bell-shaped anchor portion 97 that passes through the fixing hole 81 and is locked to the inner surface side of the mounting member 13.

Then, the inner diameter of the opening 48 of the screw drop prevention tool 41 is A, the diameter of the head 32 of the screw 14 is B, the diameter of the washer 35 is C, the diameter of the tip of the driver 23 is D, and the diameter of the screw 14 is If the minimum distance from the center position to the leg member 92 is E, then E ≧ C /
2. There is a dimensional relationship of D <B <A <C. From this dimensional relationship, on the head side of the screw 14, the washer 35 is guided by the three leg members 92 so as to be movable in the axial direction, and the head 32 of the screw 14 is inserted through the opening 48, but the washer 35 is provided. Is a ring member
The outward movement of the abutting 91 against the mounting member 13 is restricted, and the driver 23 for screwing the screw 14 can pass through the opening 48.

Further, the distance from the inner surface side of the ring member 91 of the screw drop prevention device 41 to the outer surface of the mounting member 13 is L1, the distance from the outer surface of the washer 35 to the tip of the screw shaft portion 31 is L2, and the ring member 91 is Assuming that the distance from the inner surface side to the opening end of the screw hole 26 is L3, there is a relationship of L1 <L2 <L3. Due to this dimensional relationship, the screw 14 has a washer 35,
Of the screw shaft portion 31 is positioned in the insertion hole 28 of the mounting member 13 separated from the screw hole 26 of the mounted portion 12 in a state of being in contact with the ring member 91 of the screw shaft portion. It is adapted to be held by an insertion hole 28 holding the tip end portion of 31 and a screw fall prevention tool 41 holding the head side of the screw 14.

Next, the operation of the third embodiment will be described.

In order to hold the screw 14 on the mounting member 13, the anchor portion 97 of each leg member 92 is press-fitted into each fixing hole 81 of the mounting member 13 so that the anchor portion 97 projects toward the inner surface of the mounting member 13. Stop it,
The tip of the screw shaft portion 31 of the screw 14 is inserted into the insertion hole 28 of the mounting member 13, the ring member 91 is fitted between the tips of the leg members 92, and the legs are attached to the protrusions 93 of the ring member 91. The engaging portion 95 of the member 92 is engaged. Alternatively, with the leg members 92 attached to the protrusions 93 of the ring member 91, the head side of the screw 14 is fitted between the leg members 92 and the anchor portions 97 of the leg members 92 are attached to each other. It is press-fitted and locked in the fixing hole 81.

Then, in order to mount the mounting member 13 on the mounted portion 12 with the case 11 covered, the tip of the driver 23 is engaged with the head 32 of the screw 14 through the window hole 24 of the case 11, The screw 14 is pushed as it is to push the tip end of the screw shaft portion 31 against the screw hole 26 of the mounted portion 12. At this time, screw 14
Since the tip end side of the screw shaft portion 31 is guided by the insertion hole 28 of the mounting member 13 and the head side is guided by the three leg members 92 of the screw drop prevention tool 41, the screw 14 moves in parallel in the axial direction. ,
The tip of the screw shaft portion 31 is surely pressed against the screw hole 26. Further, the screw 14 is rotated in the screwing direction so that the screw shaft 31
Screw 14 into the screw hole 26
Moving toward 13, the mounting member 13 is tightened and fixed to the mounted portion 12 with the screw 14 as shown in FIG.

To remove the mounting member 13 from the mounted portion 12, the driver 23 is engaged with the head 32 of the screw 14 through the window hole 24 of the case 11 and the opening 48 of the ring member 91, and
Rotate 14 in the unscrewing direction to move the screw shaft part 31
Unscrew from the screw hole 26 and remove. Screw shank 31 is a screw hole
As it is unscrewed from the screw 26, the screw 14
The screw 14 is moved outwardly away from and the screw 14 is held between the insertion hole 28 and the screw drop prevention tool 41.

Next, the construction of the fourth embodiment of the component mounting apparatus of the present invention will be described with reference to FIGS.

In the mounting member 13, three screw holes 101 are formed concentrically around the insertion hole 28 at equal angles.
Further, the screw 14 is a countersunk screw having a dish-shaped head 32.

The screw drop prevention tool 41 is composed of three holding screws 111 whose tip portions are screwed into the screw holes 101 of the mounting member 13. Each of the holding screws 111 comprises a screw shaft portion 112 and a head 113 formed at one end of the screw shaft portion 112,
A flange 114 is formed around the head 113,
The end face of 3 is an engaging recess with which the tip of the driver 23 is engaged.
115 have been formed. Further, the opening 48 is formed between the flanges 114 of the three holding screws 111.

The distance between the openings 48 of the screw drop prevention tool 41 is A, the diameter of the head 32 of the screw 14 is B, the diameter of the tip of the driver 23 is D, and the holding screw 111 from the center position of the screw 14 is used. Let E be the minimum distance to the screw shaft 112 of E, then E ≧ B /
2. There is a dimensional relationship of D <A <C. From this dimensional relationship,
The head 32 of the screw 14 corresponds to the screw shank 11 of the three-way retaining screw 111.
It is guided by 2 and is movable in the axial direction.
The head 32 of 14 abuts on the flange 114 of the holding screw 111 to restrict the outward movement away from the mounting member 13, and the driver 23 for screwing the screw 14 inserts the opening 48 through the opening 48. It is possible.

Further, the holding screw 111 of the screw fall prevention tool 41
The distance from the inner surface side of the flange portion 114 to the outer surface of the mounting member 13 is L1, and the distance from the position where the head portion 32 of the screw 14 abuts the flange portion 114 to the tip of the screw shaft portion 31 is L2, the flange portion 114 of The distance from the inner surface side to the open end of the screw hole 26 is L
If there is 3, there is a relationship of L1 <L2 <L3. From this dimensional relationship, the screw 14 has a mounting member 13 in which the tip end of the screw shaft portion 31 is separated from the screw hole 26 of the mounted portion 12 in a state where the head portion 32 is in contact with the flange portion 114 of the holding screw 111. Of the screw shaft portion 31 and the screw drop prevention tool 41 holding the head portion 32 of the screw 14. ing.

Next, the operation of the fourth embodiment will be described.

To hold the screw 14 on the mounting member 13,
The tip end portion of the screw shaft portion 31 of 14 is inserted into the insertion hole 28 of the mounting member 13, and the tip end portion of the screw shaft portion 112 of each holding screw 111 is screwed into each screw hole 101 of the mounting member 13.

Then, in order to mount the mounting member 13 to the mounted portion 12 in a state of being covered with the case 11, the tip end of the driver 23 is attached to the head 32 of the screw 14 through the window hole 24 and the opening 48 of the case 11. Engage and push the screw 14 as it is to screw shaft
The tip portion of 31 is pressed against the screw hole 26 of the mounted portion 12. At this time, the tip end side of the screw shaft portion 31 of the screw 14 is guided by the insertion hole 28 of the mounting member 13, and the head 32 has three holding screws.
Guided by 111, the screw 14 translates axially,
The tip of the screw shaft portion 31 is surely pressed against the screw hole 26. Further, the screw 14 is rotated in the screwing direction so that the screw shaft 31
Screw 14 into the screw hole 26
Moving toward 13, the mounting member 13 is tightened and fixed to the mounted portion 12 with the screw 14.

To remove the mounting member 13 from the mounted portion 12, the driver 23 is moved to the window hole 24 and the opening portion 48 of the case 11.
Engages with the head portion 32 of the screw 14 and rotates the screw 14 in the unscrewing direction to unscrew the screw shaft portion 31 from the screw hole 26 of the mounted portion 12 and remove it. As the screw shaft portion 31 is unscrewed from the screw hole 26, the screw 14 moves outward away from the mounting member 13, and the screw 14 is inserted between the insertion hole 28 and the screw fall prevention tool 41. Retained.

As described above, also in the second, third and fourth embodiments, the insertion hole 28 of the mounting member 13 and the screw fall prevention tool are provided.
41 holds the screw 14 in the mounting member 13 so as to be movable in the axial direction, the tip of the screw shaft portion 31 is mounted on the mounting member 13.
It can be held without protruding from 13, and can be applied to a mounting structure that combines the mounted part 12 and the mounting member 13 into a joined state before mounting the screw, and also prevents the screw from falling when removing the screw 14. It is possible to prevent the screw 14 and the screw fall prevention tool 41 from falling without applying an excessive force to the 41.

[0058]

According to the present invention, the screw can be held in the mounting member in the axially movable and rotatable state by the insertion hole of the mounting member and the screw drop preventing tool.
Therefore, the tip of the screw can be held in a state where it does not protrude from the mounting member, and it can be applied to a mounting structure that combines the mounting member and the mounted part in a joined state before mounting the screw. Occasionally, an unreasonable force is not applied to the screw fall prevention device, and the screws and the screw fall prevention device can be reliably prevented from falling.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a component mounting device of the present invention.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a sectional view of a screw tightened state of the above embodiment.

FIG. 4 is a sectional view showing a second embodiment of the component mounting device of the present invention.

FIG. 5 is a front view of the embodiment.

FIG. 6 is a cross-sectional view of the embodiment as viewed from the bottom surface direction.

FIG. 7 is a cross-sectional view of the same embodiment as the screw tightened state.

FIG. 8 is a sectional view showing a third embodiment of the component attaching device of the present invention.

FIG. 9 is a front view of the embodiment.

FIG. 10 is a sectional view showing a fourth embodiment of the component attaching device of the present invention.

FIG. 11 is a front view of the above embodiment.

FIG. 12 is a cross-sectional view showing a conventional component mounting structure.

[Explanation of symbols]

 12 Mounted part 13 Mounting member 14 Screw 28 Insert hole 32 Head 41 Screw drop prevention device 48 Opening

Claims (1)

[Claims] 1. A component mounting device in which a screw is inserted into an insertion hole provided in a mounting member and the mounting member is mounted to a mounting portion by the screw, the head side of the screw being fixed to the mounting member in the axial direction. It is equipped with a screw fall prevention tool that holds it so that it can be moved and rotated, and that it has an opening that faces the end surface of the screw head and cannot be inserted through the head side, and that a screw mounting tool can be inserted through it. A component mounting device, wherein a screw is held in the mounting member by the insertion hole into which the tip end side of the screw is inserted and the screw drop prevention tool which holds the head side of the screw.