JPH1026121A - Fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost and improve workability. SOLUTION: The constitution of a fastener is simplified, cost can be reduced, the fastening can be performed by a simple work and workability can be improved because the engaging projections 22 of elastic members 20 which are formed into rough U-shapes symmetrically around the axis of the shank 12 of a fastener 10 and have pairs of elastic pieces 21 extending individually to the side of a head 11 are made to be elastically engaged to thread grooves S1 when the shank 12 is inserted into a thread hole S.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper which can be resiliently engaged with a screw groove of a screw hole by being inserted into the screw hole.

[0002]

2. Description of the Related Art As a conventional stopper, for example, there is one disclosed in Japanese Utility Model Publication No. 4-33455. That is, when the driving tool is raised, the driving rod is pulled up, the engaging element is housed in the main body of the engaging member, and the engaging member can be inserted along the cylindrical inside of the locking member. When the driving tool is tilted, the driving rod is pushed in, the engaging member projects from the outer wall of the main body of the engaging member, meshes with the locking member of the locking member, and the engaging member and the locking member engage with each other. It is a fastening member to be performed.

[0003]

However, such a conventional stopper is provided with a driving tool, a driving rod, and the like, so that the structure is complicated and the cost is increased. The operation causes the engaging element to be disengaged from the engaging element, so that the assembling operation using the fastening member is not easy and the workability is poor. The present invention has been made in view of such a conventional problem. When the shaft of the stopper is inserted into the screw hole, the engagement protrusion of the elastic member resiliently engages the screw groove. It is an object of the present invention to provide a stopper which can simplify the configuration, reduce the cost, can be stopped by a simple operation, and can improve workability.

[0004]

The gist of the present invention for achieving the above object lies in the matters described in the following items. [1] In a stopper that can be resiliently engaged with a screw groove (S1) of the screw hole (S) by being inserted into the screw hole (S), the stopper (10) has a head ( 11) and a shaft portion (12), and a distal end of the shaft portion (12) supports an elastic member (20) extending toward the head (11) along the axis of the shaft portion (12). On the outer edge of the elastic member (20), an engagement protrusion (22) resiliently engageable with the screw groove (S1) of the screw hole (S) by the restoring force of the elastic member (20). ) Is formed.

[2] The elastic member (20) is formed in a substantially U shape having a pair of elastic pieces (21), and the pair of elastic pieces (21) is aligned with the axis of the shaft portion (12). The connecting portion (25) of the pair of elastic pieces (21) is swingably pivotally attached to the tip of the shaft portion (12). The fastener according to claim 1, characterized in that:

[3] The elastic member (30) is formed in a plate shape, and a plurality of the elastic members (30) are overlapped with each other.
3. The stop according to claim 1, wherein the stopper is slidably connected to the tip of the shaft (12).

[4] The elastic members (20, 30)
The stopper according to claim 2 or 3, wherein the stopper is provided in a plurality of stages in the axial direction of the shaft portion (12). [5] The elastic member (20, 30) includes the shaft portion (1).
2) At least one set of the plurality of elastic members (20, 30) is provided in a plurality of stages in the axial direction, and a pivot (16, 16a) pivotally connecting the set of elastic members (20, 30). )
Are disposed so as to intersect each other when viewed from the axial direction of the shaft portion (12).
Stopper described in item.

Next, the operation of the invention described in each of the above items will be described. In the fastener according to the item [1], when the shaft (12) of the fastener is inserted into the screw hole (S), the elastic member (20) supported by the tip of the shaft (12) becomes a screw. When hitting the thread (S2) of the hole (S), the thread (S2) of the screw hole (S)
Is a screw hole (S) against the elastic member (20) against its elasticity.
It is pushed toward the center, whereby the substantially C-shaped elastic member (20) is reduced in diameter and gets over the thread (S2) of the screw hole (S). In this manner, when the diameter of the elastic member (20) is reduced, the elastic member (20) passes over the thread (S2) of the screw hole (S), and the shaft portion (12) of the stopper is inserted to a predetermined position.
The elastic member (20) recovers and expands in diameter, and the elastic member (20)
Are resiliently engaged with the screw groove (S1) of the screw hole (S), so that the stopper cannot be removed from the screw hole (S).

When a force is applied in a direction in which the shaft portion (12) of the stopper is pulled out from the screw hole (S), the engaging projection (22) of the elastic member (20) causes the thread (S2) of the screw hole (S). Pressed. The force pushed by the thread (S2) is applied to the elastic member (20).
If the shape of the engagement protrusion (22) and the thread (S2) is set so that the elastic member (20) is directed to the position on the front side of the shaft portion (12) from the position where the elastic member (20) is supported, , The engagement protrusion (22) of the elastic member (20) bites into the screw groove (S1) of the screw hole (S), and the pull-out force increases. To remove the shaft (12) of the stopper from the screw hole (S), the stopper may be turned in the loosening direction. Thereby, the engagement protrusion (2) of the elastic member (20) is
2) is guided by the screw groove (S1) of the screw hole (S), and the stopper comes off.

[0010] In the stopper according to the item [2], the elastic member (20) is formed in a substantially U shape having a pair of elastic pieces (21), and the pair of elastic pieces (21) is formed by the shaft. Department (1
It extends symmetrically to the head (11) side with respect to the axis of 2), and the connecting portion (25) of the pair of elastic pieces (21) can swing to the tip of the shaft portion (12). Since it is pivoted, insert the shaft (12) of the stopper into the screw hole (S),
When the engagement protrusion (22) of the elastic member (20) supported on the tip of the shaft (12) resiliently engages with the screw groove (S1) of the screw hole (S), The projection (22) has a thread groove (S
If not properly engaged with (1), the elastic member (2)
0) swings, and the engagement protrusion (22) moves with respect to the screw groove (S1), and appropriately engages with the screw groove (S1). Thereby, the engagement protrusion (22) and the screw groove (S
1) Even if there is a dimensional variation, the dimensional variation is absorbed, and the engaging projection (22) is appropriately engaged with the screw groove (S1), and the pulling force of the stopper is high. Can be secured.

[0011] In the stopper according to the item [3], the elastic member (30) is formed in a plate shape, and a plurality of the elastic members (30) are overlapped with each other so as to be slidable with respect to each other. 12)
Respectively, so that the shaft (12) of the stopper (10) is inserted into the screw hole (S), and the engagement of the elastic member (30) supported by the front end of the shaft (12). Protrusions (2
When 2) engages with the screw groove (S1) of the screw hole (S), each elastic member (30) slides with each other, and the engaging protrusion (32) of each elastic member (30) is moved. The elasticity of the elastic member (30) allows the elastic member (30) to bite into the screw groove (S1) due to the elasticity.
The engagement projections (32) of the first and second engagement portions appropriately engage with the thread groove (S1).

Further, the position of at least two engagement projections (32) of the plurality of elastic members (30) or the engagement projections (3
If the pitch of 2) is intentionally shifted in different directions with respect to the position of the screw groove (S1) or the pitch of the screw groove (S1), at least two elastic members (30)
Of the elastic member (30) and the screw groove (S1) can be absorbed, and the pull-out force of the stopper can be absorbed. Can be ensured to be high.

[0013] In the stopper according to the item [4], the elastic members (20, 30) are provided in a plurality of stages in the axial direction of the shaft portion (12). , 3
The engagement projections (22, 32) of (0) resiliently engage with the screw grooves (S1), respectively, and the force of the stopper is further improved.

In the stopper according to the item [5], the elastic members (20, 30) are provided in a plurality of stages in the axial direction of the shaft portion (12), and the plurality of elastic members (20, 30) are provided. )
At least one pair of the elastic members (20, 30)
Are arranged so as to cross each other when viewed from the axial direction of the shaft portion (12).
Engagement projections (22, 32) of stepped elastic members (20, 30)
Are resiliently engaged with the thread grooves (S1), respectively, so that the force of the stopper is further improved, and the engagement protrusions (22, 32) of the two-stage elastic members (20, 30) are formed. Engagement of the screw hole (S) around the screw groove (S1) of the screw hole (S1) can be substantially equally performed at four places, the run-out of the stopper can be suppressed from any direction, and rattling of the stopper can be prevented. .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention. As shown in FIGS. 1 to 3, the stopper 10 according to the present embodiment can be elastically engaged with the screw groove S1 of the screw hole S by being inserted into the screw hole S. It is a one-touch clip.

The stopper 10 has a head portion 11 and a shaft portion 12, and the outer periphery of the head portion 11 is formed in a hexagonal shape. A slit portion 1 that is recessed toward the head 11 side is provided at a tip end surface of the shaft portion 12.
3 are formed. A pair of bearings 14 are formed on both sides of the slit 13, and through holes 15 are formed in the pair of bearings 14. As shown in FIGS. 1 to 3, the pivot 16 serving as a pin member is connected to both the through holes 1.
5 and is mounted on a pair of bearing portions 14 on both sides. An elastic member 20 is pivotally attached to the pivot 16 so as to be swingable.

The elastic member 20 is formed by forming a plate having a thickness of about 1 mm into a substantially U-shape symmetrically with respect to the axis of the shaft 12, and the head along the axis of the shaft 12. It has a pair of elastic pieces 21 each extending to the 11 side. A pivot hole 26 through which the pivot 16 is inserted is formed in the connecting portion 25 that connects the pair of elastic pieces 21. Elastic member 20
May have one elastic piece 21.

As shown in FIG. 4, the outer edges of the pair of elastic pieces 21 protrude outward from the outer diameter of the shaft portion 12.
Triangular engagement projection 22 resiliently engaged with screw groove S1
Are formed. The three engaging projections 22 formed on the outer edge of each elastic piece 21 are continuously provided at the same pitch as the screw groove S1, and the line connecting the protruding ends of the three engaging projections 22 inserts the stopper 10. In the front enlarged state, the shaft portion 12 is opened 5 degrees with respect to the axis line. The respective engagement projections 22 of the pair of elastic pieces 21 are formed so as to be shifted from each other by a half lead (L / 2) so as to correspond to the thread groove S1. That is,
In FIG. 4, L ₁ −L ₂ = L / 2 holds.

In the state where the triangular engagement protrusion 22 is engaged with the screw groove S1, when the stopper 10 is to be pulled out,
The slope of the engagement projection 22 and the slope of the thread groove S1 are in contact with each other. The slope of the engagement protrusion 22 that contacts the slope of the screw groove S1 is a line perpendicular to the contact surface, that is, the force F that the screw groove S1 presses the engagement protrusion 22 is applied to the pin member 16 that is the pivot point. It is set so as to face a position on the tip side of the shaft portion 12 from the center position.

Next, the operation of the above embodiment will be described.
When the shaft 12 of the stopper 20 is inserted into the screw hole S,
The engagement protrusion 22 of the elastic member 20 pivotally attached to the shaft portion 12
The thread S2 of the screw hole S is hit one after another.
Thread S2 pushes the elastic member 20 toward the center of the screw hole against its elasticity, whereby the diameter of the elastic member 20 is reduced, and the engagement protrusion 22 of the elastic member 20 moves the thread of the screw hole S into the thread. 2
And exceeds the screw thread S2 of the screw hole S.

In this manner, the diameter of the elastic member 20 is reduced, the engaging projection 22 goes over the thread S2 of the screw hole S, and the shaft 12 of the stopper 10 is inserted to a predetermined position.
Each of the engagement protrusions 22 of the elastic member 20 is formed by a screw groove S1 of the screw hole S.
, The elastic member 20 recovers and expands its diameter, and each engaging projection 22 of the elastic member 20 resiliently engages with the screw groove S1 of the screw hole S, whereby the stopper 10 is It becomes impossible to escape from S.

In a state where the engaging projection 22 of the elastic member 20 is resiliently engaged with the thread groove S1 of the screw hole S, when the stopper 10 is to be pulled out, the slope of the engaging projection 22 and the thread groove S
1 is in contact with the slope, and the slope of the thread groove S1 is
Press the second slope. The force by which the slope of the thread groove S1 presses the slope of the engagement protrusion 22 is set so as to be directed to the position on the distal end side of the shaft portion 12 from the position of the pin member 16 which is a pivot point. 21 receives a force in an opening direction with respect to the axis of the shaft portion 12. Thereby, the engagement protrusion 22 of the elastic member 20 further bites into the screw groove S1, and the removal force of the stopper 10 can be increased.

In order to pull out the shaft portion 12 of the stopper 10 from the screw hole S, the head 11 of the stopper 10 may be turned in the loosening direction. Thereby, the engagement protrusion 22 of the elastic member 20 is guided to the screw groove S1 of the screw hole S, and the stopper 10 comes off.

FIGS. 5 to 7 show a second embodiment of the present invention. In the second embodiment, the thickness is 0.3 m.
The three elastic members 30 are overlapped with each other and pivotally attached to the shaft portions 32 of the stoppers 30 so as to be slidable with each other. The three stoppers 30 are configured such that the stoppers 30 which are curved plates on both sides elastically contact the stoppers 30 which are flat central plates. As shown in FIG. 7, the triple engaging projections 32 of the central stopper 30 correspond to the screw grooves S1 and are formed at the same pitch as the screw grooves S1.

The engaging projections 32 of the stoppers 30 on both sides are formed such that the positions of the protruding ends or the pitches of the three engaging projections 32 are shifted in opposite directions. In a state in which the engagement protrusion 32 of each elastic member 30 is resiliently engaged with the screw groove S1 of the screw hole S, the three stoppers 30 swing,
By sliding with each other, the engaging protrusions 32 bite into the screw groove S1 and appropriately engage with each other.
2 can be increased from the screw hole S.

The engaging projections 32 of the stoppers 30 on both sides are also provided.
Are formed such that the positions of the protruding ends or the pitches of the three engagement projections 32 are shifted in opposite directions, so that each engagement projection 32 is engaged with the thread groove S1 without any gap, The rattle of the stopper 30 with respect to the screw hole S is eliminated, and the rattle due to the dimensional error between the screw hole S and the stopper 30 is absorbed, and the stopper 50 can be engaged with the screw hole S without rattling.

FIGS. 8 to 10 show a third embodiment of the present invention. In the third embodiment, the elastic member 2
Numerals 0 are provided in the upper and lower two stages in the axial direction of the shaft portion 12. The shaft portion 12 has a slit portion 13 formed on the distal end surface thereof so as to be recessed toward the head portion 11, and a slit portion 13 a formed on the base end side.

A pair of bearings 14, 14a are formed on both sides with the slits 13, 13a therebetween, and through holes 15, 15a are formed in the pair of bearings 14, 14a, respectively. The pivots 16 and 16a, which are pin members, are fitted into both the through holes 15 and 15a to form a pair of bearings 1 on both sides.
4, 14a. Elastic members 20 are pivotably attached to the pivots 16 and 16a, respectively. The pivots 16 and 16a are disposed so as to be orthogonal to each other when viewed from the axial direction of the shaft portion 12.

In the stopper according to the third embodiment, 2
Since the engaging protrusions 22 of the step elastic member 20 resiliently engage with the screw grooves S1, respectively, the pulling force is further improved. In addition, since the pivots 16 and 16a are arranged so as to be orthogonal to each other when viewed from the axial direction of the shaft portion 12, the engaging projections 22 of the two-stage elastic member 20 are screwed into the screw groove S1 of the screw hole S.
Engagement is made at four places around the circumference almost uniformly, so that the swing of the stopper can be suppressed from any direction, and rattling of the stopper can be prevented.

FIGS. 11 to 13 show a fourth embodiment of the present invention. In the fourth embodiment, the third
Instead of the slits 13 and 13a in the embodiment,
Seat surfaces 13b and 13c are formed. Each seat 13b,
13c is formed in a plane facing each other and parallel to each other, and the through holes 15b,
15c, pivots 16b and 16c are fitted, and each pivot 16
A pair of elastic members 20 are pivotally attached to b and 16c, respectively.

In the stopper according to the fourth embodiment,
The engagement projections 22 of the two-stage elastic member 20 are almost equally engaged in two stages at four locations around the screw groove S1 of the screw hole S, so that the swing of the stopper can be further suppressed, and As a result, the engaging projections 22 of the pair of elastic members 20 on both sides receive the same reaction force from the screw groove S1 side, and the axis of the shaft portion 12 of the stopper has the screw hole S. And the centering accuracy of the stopper can be increased.

[0032]

According to the stopper of the present invention, when the shaft of the stopper is inserted into the screw hole, the engaging projection of the elastic member is resiliently engaged with the screw groove. The structure can be simplified, the cost can be reduced, and the operation can be stopped by a simple operation, and the workability can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of a stopper according to a first embodiment of the present invention.

FIG. 2 is a plan view of a stopper according to the first embodiment of the present invention.

FIG. 3 is a side view of the stopper showing the first embodiment of the present invention.

FIG. 4 is a side view of the elastic member according to the first embodiment of the present invention.

FIG. 5 is a plan view of a stopper showing a second embodiment of the present invention.

FIG. 6 is a side view of a stopper according to a second embodiment of the present invention.

FIG. 7 is a partially enlarged front view of an elastic member according to a second embodiment of the present invention.

FIG. 8 is a front view of a stopper showing a third embodiment of the present invention.

FIG. 9 is a plan view of a stopper showing a third embodiment of the present invention.

FIG. 10 is a side view of a stopper according to a third embodiment of the present invention.

FIG. 11 is a front view of a stopper showing a fourth embodiment of the present invention.

FIG. 12 is a plan view of a stopper showing a fourth embodiment of the present invention.

FIG. 13 is a side view of a stopper according to a fourth embodiment of the present invention.

[Explanation of symbols]

 S: Screw hole S1: Screw groove S2: Thread 10: Stopper 11: Head 12: Shaft 13: Slit 14: Bearing 15: Through hole 16: Axis 20, 30: Elastic member

Claims (5)

[Claims] 1. A stopper which can be resiliently engaged with a screw groove of the screw hole by being inserted into the screw hole, wherein the stopper has a head portion and a shaft portion, An elastic member extending to the head side along the axis of the shaft portion is supported at the tip of the elastic member, and the outer edge of the elastic member is elastically resilient to the screw groove of the screw hole by the restoring force of the elastic member. An engaging projection capable of engaging with the stopper is formed. 2. The elastic member is formed in a substantially U-shape having a pair of elastic pieces, and the pair of elastic pieces extend symmetrically with respect to an axis of the shaft portion toward the head. The fastener according to claim 1, wherein a connecting portion of the pair of elastic pieces is pivotably attached to a tip of the shaft portion. 3. The elastic member is formed in a plate shape, and a plurality of the elastic members are superimposed on each other and pivotally attached to a tip end of the shaft portion so as to be slidable with each other. The fastener according to 1 or 2. 4. The stopper according to claim 2, wherein said elastic member is provided in a plurality of stages in the axial direction of said shaft portion. 5. The elastic member is provided in a plurality of stages in the axial direction of the shaft portion, and at least one set of the plurality of stages of elastic members has a pivot for pivotally connecting the set of elastic members, The stop according to claim 2, 3 or 4, wherein the stop is disposed so as to intersect each other when viewed from the axial direction of the shaft.