JP3295706B2 - Bolt / nut unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt / nut unit used for, for example, fastening plate members to each other or attaching an instrument to the plate members, and more particularly to a specific shape provided on such members. The present invention relates to a bolt / nut unit which can be attached to an insertion hole of a member, and can easily perform fastening of members from one side surface thereof.

[0002]

2. Description of the Related Art A bolt / nut unit comprising a combination of a bolt and a nut screwed to the bolt is generally used for fastening members or attaching an instrument to the member. For example, in order to fasten members together using this bolt / nut unit, a circular hole for inserting a nut is provided in a fastening portion of each member to be fastened, and both members are overlapped and a bolt is inserted from one surface of the member into the circular hole. And screw the bolt to the nut manually aligned from the opposite back side. In the case where an instrument is attached to a member, a circular hole for inserting a nut is provided in an attaching portion of the instrument, a bolt is inserted into the circular hole from the instrument attaching side of the member, and alignment is manually performed from the opposite side. Screw the bolt to the nut. Thus, in each case, the bolt / nut unit is attached to the member by turning the hand from both sides of the member.

[0003]

However, in the conventional member mounting method using a bolt and nut unit, it is necessary to work by turning the hands on both sides of the member as described above. If not, you cannot work. Accordingly, an object of the present invention is to solve the problems of the conventional bolt / nut unit and to provide a novel bolt / nut unit that can easily perform all mounting operations from one side of a member.

[0004]

A bolt and nut unit according to the present invention for solving the above-mentioned problems has a pair in a plane.
Connects a pair of facing arc edges (21) and both arc edges (21)
Insertion hole (23) formed by a pair of parallel straight edges (22)
For attaching to the insertion hole (23) of the member (20) provided with
A belt-nut unit, the bolt (3), the
Screw to the bolt (3) and a pair of
A nut (4) with a locking piece (10) projecting outward in the radial direction;
An insertion hole (5) through which the bolt (3) is inserted is formed on the axis.
It has a short cylinder part (6) formed, and the short cylinder part (6)
It has a nut support part (7) protruding in a pair of legs at the end,
The hook (10) of the nut (4) is attached to the nut support.
Locked to prevent rotation and its nut (4) is guided in the axial direction
A main body (8) to be used, and the bolt (3) is
While being inserted through the insertion hole (5) of the body (8),
The nut (4) is screwed on, and the latch piece of the nut (4) is
Lock (10) to the nut support (7) of the body (8).
In this state, the nut support (7) and the hook (10) are
Combined periphery, aligned with the insertion hole (23), the body
(8) The combination of the nut support (7) and the nut (4)
The nut (4) is inserted through the insertion hole (23)
Turn the nut (4) together with the body (8)
And by rotating the bolt (3),
The hook (10) of the nut (4) is inserted into the straight hole (23) of the nut (4).
It is characterized by being hooked on the line edge (22) . Next, in a preferred embodiment of the present invention, a compression spring is interposed between the short tube portion and the nut.

[0005]

According to the bolt / nut unit of the present invention, when the bolt is screwed into the nut supported by the nut support from the short cylindrical portion , the latching piece of the nut constitutes the leg constituting the nut support. It is guided by the inside guide groove and rises. Therefore, the distance between the lower surface of the short cylindrical portion and the upper surface of the nut can be adjusted by the screwing amount of the bolt. To attach the bolt / nut unit to the member, first, as described above, the distance between the lower surface of the short tube portion and the upper surface of the nut is set slightly larger than the thickness of the member. Next, after inserting the nut support portion through the insertion hole of the member from one side to position the nut portion on the opposite side, the main body (and the nut support portion integrated therewith)
Is rotated by a certain angle, and the nut support portion comes into contact with the insertion hole and stops. Then, the nut rotates, whereby the latching piece of the nut protrudes laterally from the straight edge of the insertion hole, and is hooked on the straight edge. Next, when the bolt is further screwed in, the nut is tightened, and the member is strongly clamped between the lower surface of the short tube portion and the upper surface of the nut, so that the bolt / nut unit is firmly attached to the member. As described above, since the bolt / nut unit of the present invention can be attached from only one side of the member, it can be easily attached even when the hand does not turn to the opposite side of the member.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing an example of the bolt / nut unit of the present invention. The unit is provided with a bolt 3 comprising an enlarged head 1 having a driver groove and a shaft 2 having an external thread portion, a nut 4 screwed to the bolt 3, and a short hole 5 through which the bolt 3 is inserted. A main body 8 is formed by coaxially connecting a pair of leg-shaped protruding nut supports 7 that support the tubular short tubular portion 6 and the nut 4 slidably in the axial direction. Further, a compression spring 9 is provided to apply a repulsive force between the bolt 3 and the nut 4 as desired.

[0007] The nut 4 having an inner thread portion is composed of a pair of latching pieces 10 projecting in opposite tangential directions (ie, projecting like a lightning bolt) from the diagonal outer peripheral portion, and a pair of the latching pieces 10. It has a pair of guide projections 11 projecting in opposite tangential directions from the diagonal outer peripheral portion of the intermediate portion (that is, projecting like a lightning bolt). The outer peripheral surface of the hooking piece 10 is formed in a shape that forms an arc portion of an imaginary circumferential surface centered on the axis of the nut 4. The guide claw 11 has a shorter projecting length than the hooking piece 10, but its outer peripheral surface is formed in a shape that forms an arc portion of the virtual circumferential surface, similarly to the hooking piece 10.

The short cylindrical portion 6 constituting the upper portion of the main body 8 is formed of a short cylindrical body whose outer peripheral surface is a tapered surface that expands upward, and whose upper surface is a tapered surface whose inner diameter decreases downward. A circular insertion hole 5 is provided at the center. The nut support portion 7 constituting the lower portion of the body 8 is composed of a pair of legs 12 which extend axially downwardly from the bottom of the short tubular portion 6, these legs 12 the axis of the short cylindrical portion 6 It is arranged on a diagonal line with the center, and the inner and outer peripheries of the cross section are shaped to form an arc portion of a virtual cylinder centered on the axis of the short cylinder portion 6. Therefore, the nut support 7 constituted by the pair of legs 12 is coaxially coupled to the short cylinder 6. The radius of the inner peripheral surface of the virtual cylinder is configured to be larger than the radius of the outer peripheral surface of the nut 4 by the gap into which the nut 4 is inserted, and the radius of the outer peripheral surface of the virtual cylinder is the tip of the hook piece 10 of the nut 4. Is the same as the radius of the virtual circumference.

A side edge portion of each leg portion 12 near the short tube portion 6 is partially cut off along the axial direction to form a nut insertion portion 13. The gap between the notches of each leg 12, that is, the width of the nut insertion portion 13, corresponds to a pair of protrusions 11 on the nut 4.
Is a slightly larger dimension than the spacing of the tip, the projections 1
The nut 4 with the tip of the nut 1 parallel to the width direction of the nut insertion portion 13 can be inserted into and out of the nut support portion 7. FIG. 2 is a perspective sectional view showing the main body 8 cut in half in the axial direction. The nut 4 is hooked on the inner surface of the leg 12.
A guide groove 14 is provided which engages the piece 10 and allows it to move in the axial direction. The guide groove 14 is cut from the bottom of the leg 12 slightly above the bottom along the axial direction so as to prevent the nut from falling off, and further extends to the upper surface of the short cylindrical portion 6 thereon. However, the groove portion in the short tube portion 6 is not essential because it is provided merely due to manufacturing restrictions such as die cutting.

Next, a procedure for assembling the bolt / nut unit of FIG. 1 will be described. First, the nut support 7 of the main body 8
In order to support the nut 4, the tips of the pair of engaging pieces 10 of the nut 4 are inserted into the nut insertion portions 13 provided between the legs 12.
And the nut 4 is inserted from the nut insertion portion 13 to the leg 12 in the posture as it is. Then the upper surface of the compression spring 9 nut 4, is press-fitted from below side between the short tube portion 6 the lower surface of the main body 8. Next, the inserted bolt 3 is inserted into the insertion hole 5 of the short cylindrical portion 6 of the main body 8, and further lowered, and when the tip of the bolt 3 reaches the nut 4, the bolt 3 is rotated and screwed to complete the assembly. .

FIG. 3 is a perspective view showing the bolt / nut unit assembled as described above and a state in which the unit is attached to an insertion hole provided in a member. The nut 4 is slightly screwed into the bolt 3 and is located near the bottom of the nut support portion 8. The tapered surface below the head 1 of the bolt 3 is a short cylinder.
The upper surface of the portion 6 is in contact with the tapered surface. FIG. 3 shows an example in which two members are laminated with each other. Each member 20 has an arcuate edge 21 and a straight edge 22 opposed to each other at a fastening position.
Is provided. Then, the assembled bolt / nut unit is inserted into the insertion hole 23 from one side of the member 20 as shown by the arrow.

FIG. 4 is a bottom view of the state where the bolt / nut unit is inserted into the insertion hole 23 of the member 20 as viewed from the opposite side. A portion that penetrates through the insertion hole 23 and reaches the opposite side is a tip portion where the bolt 3, the nut 4, and the nut support portion 7 (a pair of legs 12) that support the bolt 3, the nut 4, are assembled.
The projected cross section has the same shape as the cross sectional shape of the member 20. That is, a nut 4 screwed around a bolt 3
The outer circular arc portion contacts the inner peripheral portion of the leg 12, and the linear portions of the pair of latching pieces 10 of the nut 4 contact a portion of the linear edge 22 of the insertion hole 23 and the end side portion of the leg 12, The arc portion at the tip is in contact with a part of the arc edge 21 of the insertion hole 23. The outer peripheral portion of the leg 12 is also inserted into the insertion hole 23.
Is in contact with a part of the arc edge 21 of FIG. Therefore, the projected cross section and the cross section of the insertion hole 23 have the same shape.

FIG. 5 shows a state in which the main body of the bolt / nut unit is rotated by approximately 45 degrees from the state shown in FIG. The bolt 3, the nut 4, and the nut support 7 are integrally rotated by 45 degrees via the compression spring 9, and the locking piece 10
Is projected from the straight edge 22 of the insertion hole 23 and is hooked thereon. Therefore, in this state, the bolt / nut unit is engaged so as not to come off from the member 20. Next, when we screwed a bolt 3 to the nut, short tube
The two members 20 are strongly clamped and fastened by the bottom surface of the portion and the upper surface of the nut 4.

FIG. 6 is a sectional view showing a state in which the members are fastened to each other. The compression spring 9 inserted into the bolt is compressed and functions as a spring washer. Next, in order to release the members from each other and separate them from the state shown in FIG. 6, the above-described operation may be performed. That is, first loosen the bolt 3 and put the nut 4 in a short cylinder
Then , the main body is returned 45 degrees in the opposite direction to the above to release the locking of the locking piece 10 of the nut 4. Next, the main body may be pulled out from the insertion hole 23 of the member 20. Although the above description is an example in which two members are stacked and fastened together, the same method can be used when the bolt / nut unit of the present invention is used to attach an instrument or the like to the members. it can. However, when the bolt is also used for mounting the device, it is necessary to use a bolt having a longer bolt length.

[0015]

Since the bolt / nut unit of the present invention has the above-described configuration, the target member can be easily attached to the insertion hole from one side thereof, so that the mounting workability is improved. Can be significantly increased.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an example of a bolt / nut unit of the present invention.

FIG. 2 shows a main body 8 of the bolt / nut unit of FIG.
FIG . 3 is a perspective cross-sectional view in which is cut in half in the axial direction .

FIG. 3 is a perspective view showing a state where the bolt and nut unit of FIG. 1 is assembled and a state where members are fastened by using the bolt and nut unit.

FIG. 4 is a bottom view showing a state where the assembled bolt / nut unit of FIG. 3 is inserted into an insertion hole of a member.

FIG. 5 is a bottom view showing a state in which the main body of the bolt / nut unit has been rotated approximately 45 degrees from the state of FIG. 4;

FIG. 6 is a sectional view showing a state in which bolts are further screwed into nuts to fasten members together from the state of FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Head 2 Axis 3 Bolt 4 Nut 5 Insertion hole 6 Short cylinder part 7 Nut support part 8 Main body 9 Compression spring 10 Hook piece 11 Projection 12 Leg 13 Nut insertion part 20 Member 21 Arc edge 22 Straight edge 23 Insertion hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16B 37/00 F16B 35/04 F16B 37/04

Claims (2)

(57) [Claims] A pair of arc edges facing each other in a plane.
And a pair of parallel straight edges connecting the two arc edges (21)
A bolt and nut unit for attachment to the insertion hole of the member provided with the insertion hole (23) formed out with (22) (20) (23), the bolt (3), the bolts (3) with screwed, a pair of locking pieces from the outer peripheral portion (10) protrudes radially outward into the nut (4)
If, the insertion hole (5) is shaped for inserting the bolts (3) on its axis
It has a short cylinder part (6) formed, and the short cylinder part (6)
It has a nut support part (7) protruding in a pair of legs at the end ,
The hook (10) of the nut (4) is attached to the nut support.
Locked to prevent rotation and its nut (4) is guided in the axial direction
A main body (8) to be inserted , and the bolt (3) is inserted through the insertion hole (5) of the main body (8).
At the same time, the nut (4) is screwed onto the shaft and
Attach the hook (10) of the nut (4) to the nut support of the main body (8).
While holding the nut on the holding part (7), the nut support
The outer periphery of the combination of the section (7) and the hook piece (10) is
3) and the nut support (7) of the body (8) and the nut (4)
In the assembled state, insert the nut (4) through the insertion hole (23).
The nut is integrated with the body (8)
(4) while rotating, by rotating the bolt (3), said locking piece (10) is the through hole of the nut (4)
(23) The bolt / nut unit, which is hooked on the straight edge (22). 2. A bolt / nut unit according to claim 1, wherein a compression spring (9) is interposed between said short tube portion (6) and said nut (4).