JP4854089B2 - Screw rotation stop structure - Google Patents

Description

  The present invention relates to a structure that prevents loose rotation of a screw provided by being inserted into or screwed into a member, etc., and that prevents a screw from rotating between a cap fitted on the head of the screw and the member.

Conventionally, the screw rotation prevention structure has a bolt head inserted into a member fitted in a counterbore, and a cap main body is fitted around the bolt head so as not to idle, A plurality of projecting claw pieces are elastically stretched and hooked between the cap body and the inside of the counterbore (Patent Document 1).
JP 2003-343535 A

  However, the screw rotation preventing structure has a problem that the bolt cannot be reliably prevented from rotating when the claws are weakly stretched.

  In order to solve the above-described problems, an object of the present invention is to provide a screw rotation stopping structure that can reliably prevent loose rotation of a screw.

Means the present invention is employed according to claim 1, wherein in order to reliably prevent the loosening rotation of the screw is externally fitted a cap so as not to idle in the screw rotation direction to the head of the screw provided in member, said member A first locking portion opposite to the outer surface of the cap is provided, the other locking portion is provided on the outer surface of the cap, and the other locking portion of the cap is screwed in the screw rotation direction to the one locking portion of the member. In the screw rotation prevention structure that prevents the screw from rotating with the cap, the external fitting position of the cap that can be re-fitted to the screw head is shifted by a predetermined angle in the screw rotation direction. Each size of the one locking portion of the member and the other locking portion arranged space other than the one locking portion, and other than the other locking portion and the other locking portion of the cap. One-sided Each size of the part arrangement space is such that, at the outer fitting position shifted by the predetermined angle in the screw rotation direction from the outer fitting position where the other locking part of the cap collides with the one locking part of the member, The screw rotation prevention structure is characterized in that the size of the one locking portion and the other locking portion of the cap can be arranged in each arrangement space without colliding with each other .

In the screw rotation stopping structure, in order not to protrude the cap from the member, said recess to embed the head of the screw together with the cap is provided on the member and the one engaging portion is provided on the inner surface of the recess A structure may be adopted.

In the screw rotation stopping structure, since the cross section of the head is corresponding to the screw is a regular hexagon, the head of the screw is a cross-sectional hexagonal, said cap includes a top surface of the head of the screw Adopting a structure in which the two other locking portions protrude from the facing cover plate portion along the screw axis direction, and the two other locking portions sandwich the two opposite outer surfaces of the screw head. May be.

In the screw rotation stopping structure for preventing detachment of the cap, or are brought into contact with the seat surface of the head of the screw to protrusions projecting from said member, or distant ring fitted on the shaft portion of the screw Is disposed between the seat surface of the head of the screw and the member, a gap is formed between the head and the member, and the claw at each end of the two engaging portions of the cap is inserted into the gap. Alternatively, a structure that is locked to the seating surface of the head of the screw may be employed.

In the screw rotation stopping structure, negative shape on the head, plus shapes, to correspond to the screw recesses for turning tools hexagonal hole or the like is provided, the screw recess for turning tool is provided on the head The cap is provided with a protrusion that can be non-rotatably inserted into the recess for the rotary tool from the inner surface of the cover plate facing the top surface of the screw head, and from the peripheral side of the cover plate outer fitting portion is protruded along the screw axis direction, the other engaging portion is provided on the outer surface of the outer fitting portion, it is adopted fitted gripping structures the head of the screw at the outer fitting portion Good.

In the screw rotation stopping structure for preventing detachment of the cap, or are brought into contact with the seat surface of the head of the screw to protrusions projecting from said member, or distant ring fitted on the shaft portion of the screw Is disposed between the seat surface of the head of the screw and the member, a gap is formed between the head and the member, and a claw at the tip of the outer fitting portion of the cap is inserted into the gap to You may employ | adopt the structure latched on the seat surface of the head .

In the screw rotation stopping structure for easy removal of the cap from the screw head, in a region other than the other engaging portion in the periphery of the cover plate portion of the cap, may be adopted a structure in which a transverse recess .

By the way, the screw rotation prevention structure according to the present invention is characterized in that a screw can be externally locked by fitting a cap on the head of the screw regardless of the screw rotation stop position in any of the screw rotation directions. That is, the predetermined angle θ (pitch angle in the screw rotation direction of the external fitting position where the cap can be re-fitted) is shifted in the screw rotation direction from the external fitting position where the other locking portion of the cap collides with the one locking portion of the member. by re-fit the cap fitted position, the no while it colliding the other engaging portion of the cap to the locking portion of the member being adapted to cap the screw head can fitted mounting, therefore , it is conceivable to adopt a manner of the following (1) to (3).
(1) The member is provided with a plurality of one locking portions shifted by an equal pitch angle β in the screw rotation direction, and the pitch angle β of the one locking portion is different from the predetermined angle θ, or An aspect in which the pitch angle β of one locking portion is smaller than the predetermined angle θ, and an angle that is an integral multiple of the pitch angle β of the one locking portion is different from the predetermined angle θ, or one locking portion It is the aspect provided.
(2) In the aspect of the cap, a plurality of other locking portions are provided with an equal pitch angle α shifted in the screw rotation direction, and the pitch angle α of the other locking portion is different from the predetermined angle θ, or On the other hand, one locking portion is provided.
(3) The member is provided with a plurality of one-side locking portions shifted by an equal pitch angle β in the screw rotation direction, and the cap has the other locking portions shifted by an equal pitch angle α in the screw rotation direction. The pitch angle β of one locking portion is equal to or greater than the predetermined angle θ, and the sum of the predetermined angle θ and the pitch angle β of the one locking portion is the pitch angle α of the other locking portion. It is a different aspect.

In the screw rotation preventing structure according to the first aspect of the present invention, when the screw to be loosened tries to rotate together with the cap, the other locking portion of the cap is locked to the one locking portion of the member in the screw rotation direction. It is possible to prevent the screw from loosening by reliably preventing the screw from rotating.
In addition, when trying to externally fit the cap on the screw head, if the other locking part of the cap collides with one locking part of the member, the cap is rotated from the external fitting position by a predetermined angle in the screw rotation direction. By doing so, the other locking portion of the cap can be made to face the arrangement space for the other locking portion of the member, and the arrangement space for the one locking portion of the cap can be made to face the one locking portion of the member. . Therefore, by pushing the cap toward the screw head as it is, the cap can be fitted onto the screw head, and the other locking portion of the cap can be locked to the one locking portion of the member. can get. As a result, the screw rotation prevention structure according to the present invention can prevent the screw from rotating by attaching a cap to the head of the screw regardless of the screw tightening stop position in any of the screw rotation directions. Demonstrate the effect that you can.

  A screw rotation prevention structure according to the present invention (hereinafter referred to as “the present invention rotation prevention structure”) will be described based on an embodiment shown in the drawings.

(First embodiment)
1 to 9 show a first embodiment of the rotation stopping structure of the present invention. 1A is a bottom view in which a cap 4 is externally attached to a head 3a of a screw 3 provided in the member 2, and FIG. 1B is surrounded by a one-dot chain line a in FIG. FIG. FIG. 2 is a side view taken along the line of FIG. 1 (A). 3A is a bottom view of the member 2 provided with a screw 3 indicated by a two-dot chain line, and FIG. 3B is an enlarged view of a portion surrounded by a one-dot chain line C in FIG. is there. 4A is a perspective view in which a portion surrounded by a one-dot chain line C in FIG. 3A is enlarged and turned upside down, and FIG. 4B is a sectional view taken along the knee line in FIG. 3B. Then, FIG. 4C is a side view upside down, and FIG. 4C is a side view crossed along the hoe-ho line in FIG. FIG. 5 shows the cap 4, where FIG. (A) is a perspective view, FIG. (B) is a bottom view in a state of being externally fitted to the head 3 a of the screw 3 indicated by a one-dot chain line, and FIG. It is a side view. FIG. 6 is a side view in which the member 2 having the screw 3 and the cap 4 are cross-sectionally shown upside down. FIG. 6 (A) shows the member 2 and the cap 4 separated, and FIG. 6 (B) shows the cap. 4 shows a state in which the pair of outer side surfaces 3c, 3c of the head 3a of the screw 3 are externally fitted by the claws 6a, 6a of the other engaging portions 6, 6 which have been deformed by the open leg 4 of FIG. FIG. 7 is a bottom view showing a state in which the cap 4 is externally fitted and attached to the head 3a of the screw 3 provided in the member 2, and FIG. The member 2 facing the inner corners 10b, 10b of the member 2, FIG. (B) is a screw 3 and cap 4 shifted clockwise by 15 ° from FIG. (A), and FIG. (C) is a screw from FIG. (A). 3 and the cap 4 are shifted 15 degrees counterclockwise.

  FIG. 8 is a cross-sectional bottom view in which a pair of other locking portions 6, 6 indicated by a broken line of the cap 4 to be externally fitted to the screw head 3 a collide with the one locking portions 5, 5 of the member 2. When the cap 4 collides, the pair of other locking portions 6 and 6 rotated by a pitch angle θ (θ = 60 °) in the screw rotation direction from the external fitting position are indicated by solid lines. 9A shows a pitch angle in the screw rotation direction of the one locking portion 5 of the member 2 (an angle between adjacent radial center lines of the one locking portions 5 and 5) β, and the one locking portion 5 of the part 2. The size Bt and the size Bs of the other engaging portion arrangement space formed other than the one engaging portion 5 of the member 2 are shown. FIG. 9B shows the cap 4 with respect to the screw head 3a. The pitch angle in the screw rotation direction between adjacent external fitting positions among a plurality of external fitting positions that can be externally fitted (hereinafter referred to as “external fitting position pitch angle”) θ, the size of the other locking portion 6 of the cap 4. Ct, the size Cs of the one engaging portion arrangement space formed other than the other engaging portion 6 of the cap 4, and the pitch angle in the screw rotation direction of the other engaging portion 6 of the cap 4 (adjacent other engaging portions) 6 and 6 indicates an angle α between the radial centerlines.

  As shown in FIGS. 2 and 1, the anti-rotation structure 1 of the present invention has a cap 4 fitted around the head 3 a of the screw 3 provided by being inserted into or screwed into the member 2 (not shown). The cap 4 and the member 2 prevent the screw 3 from rotating in the screw rotation direction E (see FIG. 1B). In the present embodiment, the member 2 employs a bathtub grip attached to the inside of the bathtub 17, and the connection concave portion 2 b inserted by the connection portion 18 a of the connection bolt 18 fixed to the bathtub 17 and the lower side of the surface 2 a. And a screw insertion hole 2c that is drilled upward from the bottom surface of the recess 10 and penetrates the female screw 18b of the connecting bolt 18. As shown in FIGS. 2 and 3B, the screw 3 employs a square bolt (hexagonal bolt) whose cross section of the head 3a is a polygon (regular hexagon) and is inserted into the screw insertion hole 2c of the member 2. The head 3 a is embedded in the recess 10 together with the cap 4 and screwed into the female screw 18 b of the connecting bolt 18 so that the connecting bolt 18 does not come out of the member 2.

  As shown in FIG. 1 (B), the rotation stopper structure 1 of the present invention has one locking portion 5 formed on the member 2, the other locking portion 6 formed on the cap 4, and the other locking portion 6 of the cap 4 Even if the one locking portion 5 of the member 2 is opposed in the screw rotation direction E and the screw 3 tries to rotate in the screw rotation direction E together with the cap 4, the other locking portion 6 is locked by the one locking portion 5 and rotates. It is trying to prevent.

  The cap 4 is made of synthetic resin or metal, and as shown in FIG. 2, a cover plate portion 7 facing the top surface 3 b of the head 3 a of the screw 3, and a screw axis direction from the peripheral side of the cover plate portion 7. And an external fitting portion 8 projecting along F. As shown in FIG. 5 (C), a head space S1 is formed inside the external fitting portion 8, and the head portion 3a of the screw 3 is externally fitted. (See FIG. 2). In this example, the outer fitting portion 8 is composed of two short leg-like other locking portions 6 and 6 which are opposed to each other with the head space S1 interposed therebetween. As shown in FIG. The pair of outer side surfaces 3c and 3c facing each other of the portion 3a are sandwiched and fitted so as not to idle around the head 3a. As shown in FIG. 9, the screw 3 of the present embodiment is a hexagonal bolt whose cross section of the head 3 a is a regular hexagon, and screw rotation at an outer fitting position where the cap 4 can be re-fitted to the screw head 3 a. The external fitting position pitch angle θ in the direction becomes 60 °, and can be re-fitted in six ways (note that the cap 4 has two other locking portions 6 and 6 so that it can be re-fitted. There are essentially three ways you can do it.)

  As shown in FIG. 2, the member 2 is provided with a concave portion 10 for embedding both a head 3a of the screw 3 and a cap 4 with the screw head 3a fitted thereto. As shown in FIG. 4A, the inner surface of the concave portion 10 is provided. Four one-side locking portions 5 are formed in a part. The concave portion 10 is formed by connecting four standing surface portions 10a and four inner corner portions 10b provided between the adjacent standing surface portions 10a, 10a, and the central portion of each standing surface portion 10a is one locking portion 5. The other locking portion 6 of the cap 4 is rotated in the screw rotation direction E and comes into contact (see FIG. 9). In this example, the concave portion 10 is reduced in size by making the inner corner portion 10b a curved surface with rounded corners, but the inner corner portion 10b may be a right angle and the transverse shape may be square. .

  As shown in FIG. 7A, the rotation stopper structure 1 of the present invention is configured such that the interval L3 between the opposing inner corner portions 10b, 10b of the recess 10 is the interval L1 between the outer surfaces of the other locking portions 6, 6 of the cap 4. (L3> L1), the cap 4 having the screw head 3a fitted therein is embedded in any one of the spaces S5 and S5 between the pair of opposed inner corners 10b and 10b. The cap 4 is not protruded from. Further, in the rotation stopper structure 1 of the present invention, the cap 10 is configured to rotate in the screw rotation direction E by setting the interval L2 between the upstanding surface portions 10a and 10a facing the recess 10 to be smaller than the interval L1 (L1> L2). The other locking portion 6 of 4 is in contact with the one locking portion 5 formed in the recess 10 to prevent the cap 4 from rotating.

  As shown in FIG. 6 (B), the anti-rotation structure 1 of the present invention forms a gap S3 between the screw head 3a and the bottom surface of the recess 10 of the member 2, and the tip of the outer fitting portion 8 provided on the cap 4. The cap 4 is prevented from falling off by the claw 6a engaged with the seat surface 3d of the screw 3 by inserting the claw 6a into the gap S3. In order to obtain this drop-off preventing structure, as shown in FIG. 2, the protrusion 12 protrudes from the bottom surface of the recess 10 of the member 2, and the protrusion 12 contacts the inside of the seat surface 3d of the screw head 3a. Alternatively, a distant ring (not shown) externally fitted to the shaft portion 23e of the screw 23 is disposed between the seat surface 23d of the screw head 23a and the member 2.

  As shown in FIG. 6 (B), the cap 4 is pushed into the screw 3 in the screw axis direction F so that the two short leg-like other locking portions 6 and 6 can be fitted on the head 3a. Furthermore, when pushing, it has the elasticity which can expand the space | interval between nail | claw 6a, 6a to the space | interval of the outer surface 3c, 3c which the head 3a of the screw | thread 3 opposes. Further, an insertion space S4 for inserting the other engaging portions 6 and 6 of the cap 4 is formed between the inner corner portion 10b of the recess 10 and the outer surface 3c of the screw 3, so that the cap 4 can be pushed in smoothly. It can be done. When the cap 4 is pushed into the head 3a of the screw 3, the rotation stopper structure 1 of the present invention is inserted into the insertion space S4 while being deformed so that the other locking portions 6 and 6 of the cap 4 are opened. For example, when the claw 6a reaches the same height position as the gap S3, the cap 4 is elastically restored and deformed so that the claw 6a is automatically inserted into the gap S3. Therefore, the cap 4 is securely fitted on the screw head 3a. Both the claws 6a can be locked to the seating surface 3d.

  In the rotation stopper structure 1 of the present invention, the recessed portion 10 is made smaller by reducing the insertion space S4 provided in the member 2 by providing the inclined portion 6b tapering to the tip side outside the other locking portion 6 of the cap 4. It has become. In the rotation stopper structure 1 of the present invention, the cap 4 prevents the outer fitting portion 8 from enclosing the entire periphery of the outer surface 3c of the head 3a of the screw 3 as shown in FIG. Compared to an embodiment in which the entire outer periphery of the portion 23a is surrounded by the outer fitting portion 28 of the cap 24, the other locking portions 6 and 6 of the cap 4 can be deformed by a light force.

  As shown in FIG. 5 (B), the cap 4 is provided with a laterally recessed portion 16 at a position excluding the other engaging portion 6 on the periphery, and a tool sharpened in the laterally recessed portion 16. The cap 4 can be easily removed by inserting (for example, the tip of a flat-blade screwdriver), and the water inside the member 2 can be drained through the laterally recessed portion 16. In this example, the laterally-facing concave portion 16 is formed along the outer surface 3c avoiding the protruding corner 3f of the screw head 3a, the depth of the concave portion 16 is increased, the area of the concave portion 16 is increased, and a sharp tool It is easy to insert.

  The anti-rotation structure 1 of the present invention has the following so that the screw 3 can be anti-rotated by externally attaching the cap 4 to the screw head 3a regardless of the screw 3 in the screw rotation direction E. It is constituted as follows. As shown in FIG. 9, the rotation stopper structure 1 of the present invention has a size Bt of the one locking portion 5 of the member 2 and an arrangement space for the other locking portion (other locking portion 6 is formed other than the one locking portion). The space B for insertion, the size Ct of the other locking portion 6 of the cap 4 and the one locking portion arrangement space formed other than the other locking portion (the one locking portion 5 is inserted) The size Cs of the outer fitting position is such that the outer fitting position pitch angle θ shifts from the outer fitting position (the outer fitting position G in FIG. 8) where the other locking part 6 collides with the one locking part 5 in the screw rotation direction. In the outer fitting position (outer fitting position H in FIG. 8), the one locking portion 5 or the other locking portion 6 can be arranged in each arrangement space without causing the one locking portion 5 and the other locking portion 6 to collide with each other. That ’s right.

  The rotation preventing structure 1 of the present invention thus configured is configured so that when the other locking portion 6 of the cap 4 collides with the one locking portion 5 of the member 2 when the cap 4 is to be fitted onto the screw head 3a, the cap 4 4 is rotated from the external fitting position (external fitting position G in FIG. 8) by the external fitting position pitch angle θ in the screw rotation direction E, so that the other locking portion 6 of the cap 4 is disposed for the other locking portion of the member 2. Since the space for the one locking portion of the cap 4 can be made to face the one locking portion 5 of the member 2, the cap 4 is pushed into the screw head 3a as it is, so that the cap 4 It will be in the state which can be fitted in the head 3a and the other latching | locking part 6 of the cap 4 can be latched by the one latching | locking part 5 of the member 2. FIG. As a result, the anti-rotation structure 1 of the present invention can prevent the screw 3 from being rotated by externally fitting the cap 4 to the head 3a of the screw 3 regardless of the screw 3 in the screw rotation direction E. Can be.

It should be noted that the other locking portion 6 is located on the one locking portion 5 at an outer fitting position shifted from the outer fitting position where the other locking portion 6 collides with the one locking portion 5 in the screw rotation direction. The condition that the cap 4 cannot be externally fitted to the screw head 3a due to the collision is that the external fitting position pitch angle θ in the screw rotation direction of the external fitting position where the external fitting can be re-fitted, and the other locking portion 6 of the cap 4 When the pitch angle α in the screw rotation direction (see FIG. 9) and the pitch angle β in the screw rotation direction of the one locking portion 5 of the member 2 are set, When it falls under at least one.
Part 1: α = θ
Part 2: β = θ
Part 3: β <θ and nβ = θ (where n is an integer)
Part 4: β ≧ θ and θ + β = α

  Since the rotation stopper structure 1 of the present invention has θ = 60 °, α = 180 °, and β = 90 °, none of the conditions “No. 1” to “No. 4” corresponds (see FIG. 9). The external fitting position (external fitting position H in FIG. 8) shifted from the external fitting position (external fitting position G in FIG. 8) where the other locking part 6 collides with the one locking part 5 in the screw rotation direction. ), The cap 4 can be externally fitted to the screw head 3 a without causing the other locking portion 6 to collide with the one locking portion 5.

(Second Embodiment)
10 to 16 show a second embodiment of the rotation stopper structure of the present invention. FIG. 10A is a plan view of an aspect in which the turning tool recess 23a-1 of the screw head 23a is formed in a minus shape, and FIG. 10B is a front view taken along the line H in FIG. 10A. 11A is a plan view of an embodiment in which the turning tool recess 23a-1 of the screw head 23a is formed in a plus shape, and FIG. 11B is a tote line in FIG. 11A. 12A is a plan view of an aspect in which the turning tool recess 23a-1 of the screw head 23a is formed in a hexagonal hole shape, and FIG. 12B is a view in FIG. FIG. 13A shows the pitch angle β of the one locking portion 25 of the member 2 in the screw rotation direction, the size Bt of the one locking portion 25 of the part 2, and the other engagement formed other than the one locking part of the part 2. FIG. The stop portion arrangement space size Bs is shown. FIGS. (B) to (C) show the external fitting position in the screw rotation direction of the external fitting position where the cap 24 can be externally fitted to the screw head 23a. The pitch angle θ, the size Ct of the other locking portion 26 of the cap 24, the size Cs of the one locking portion arrangement space formed other than the other locking portion of the cap 24, and the size of the other locking portion 26 of the cap 24. The pitch angle α in the screw rotation direction is shown. FIG. (B) shows a state in which the turning tool recess 23a-1 of the screw head 23a is negative, and FIG. (C) shows the rotation of the screw head 23a. The movement tool recess 23a-1 has a plus shape. D) shows the manner in which the recesses 23a-1 for inverse rotation tool of the screw head 23a in the hexagonal hole shape. FIGS. 14A to 14H show the fitting of the cap 24 in each mode in which the number of the one locking portion 25 and the other locking portion 26 is different when the turning tool recess 23a-1 of the screw head 23a is negative. It shows before and after repair. FIGS. 15A to 15H show the fitting of the cap 24 in each mode in which the number of the one locking portion 25 and the other locking portion 26 is different when the turning tool recess 23a-1 of the screw head 23a is a plus shape. It shows before and after repair. FIGS. 16A to 16H show the fitting of the cap 24 in each aspect in which the turning tool recess 23a-1 of the screw head 23a is a hexagonal hole and the number of the one locking portions 25 and the other locking portions 26 is different. It shows before and after recombination. Of the reference numerals shown in FIGS. 10 to 16, the same reference numerals as those shown in FIGS. 1 to 9 (first embodiment) denote the same components.

  The anti-rotation structure 20 of the present invention has a cap 24 fitted around the head 23a of the screw 23 provided by being inserted into or screwed into the member 2 (not shown), etc. Is prevented by the cap 24. In the rotation stopping structure 20 of the present invention, one locking portion 25 is formed on the member 2, the other locking portion 26 is formed on the cap 24, and the other locking portion 26 of the cap 24 and the one locking portion 25 of the member 2 are connected. Even if the screw 23 is opposed in the screw rotation direction E and the screw 23 tries to rotate in the screw rotation direction E together with the cap 24, the other locking portion 26 is locked to the one locking portion 25 to prevent the rotation.

As shown in FIGS. 10 to 12, the screw 23 is a bolt composed of a head portion 23a and a shaft portion 23e having a circular planar shape, and a turning tool (not shown) such as a screwdriver is provided on the top surface 23b of the head portion 23a. A turning tool recess 23a-1 for inserting and turning the tip of (omitted) is provided. The turning tool recess 23a-1 has a minus shape corresponding to a minus screwdriver as shown in FIG. 10, a plus shape corresponding to a plus screwdriver as shown in FIG. 11, or a hexagonal hole shape corresponding to a hexagon bar wrench as shown in FIG. ing.

  The cap 24 is made of synthetic resin or metal, and covers a cover plate portion 27 facing the top surface 23b of the head 23a of the screw 23, and a recess for a rotating tool of the screw 23 that protrudes from the inner surface of the cover plate portion 27. A protrusion 29 that can be fitted to and detached from 23a-1 in a non-rotatable manner, and an outer fitting part that protrudes from the entire periphery or part of the peripheral side of the cover plate part 27 along the screw axis direction F into a ring or a leg. 28, a head space S <b> 11 is formed inside the outer fitting portion 28, and the head 23 a of the screw 23 is gripped by the outer fitting portion 28. The cap 24 is provided with one other locking portion 26 protruding in the radial direction from the outer surface of the outer fitting portion 28 or a plurality of caps 24 at intervals of a pitch angle α in the screw rotation direction E (in this example, , Α = 360 °, 1 α = 180 °). On the other hand, the amount of looseness of the screw 23 can be reduced by restricting the rotatable range of the cap 23 as the number of the engaging portions 26 increases.

  The cover plate 27 of the cap 24 has a protrusion 29 protruding from the inner surface toward the head space S11. The protrusion 29 is engaged with the turning tool recess 23a-1 of the screw head 23a to prevent the cap 24 from spinning around, and the external fitting position of the cap 24 with respect to the screw head 23a is set in the screw rotation direction E. The outer fitting position pitch angle θ is shifted by a distance so that the outer fitting can be performed again. The external fitting position pitch angle θ is θ = 180 ° when the concave portion 23a-1 is negative, θ = 90 ° when positive, and θ = 60 ° when hexagonal. . There are K ways (K = 360 ° / θ) in which the outer parts can be re-fitted.

  The member 2 has a columnar one locking portion 25 protruding from the surface 2a along the screw axis direction F around the cap arrangement space S15. One or more one locking portions 25 of the member 2 are provided at a pitch angle (an angle between adjacent ones of the locking portions 25 and 25 in the radial direction) β in the screw rotation direction E. On the other hand, the amount of looseness of the screw 23 can be reduced by restricting the range in which the cap 23 can rotate as the number of the locking portions 25 increases.

  The anti-rotation structure 20 of the present invention has a gap S13 formed between the screw head 23a and the surface 2a of the member 2 as shown in FIGS. The claw 28a at the tip of the portion 28 is inserted into the gap S13, and the cap 24 is prevented from falling off by the claw 28a that engages with the seat surface 23d of the screw head 23. In order to obtain this drop-off preventing structure, a distant ring 31 that is externally fitted to the shaft 23e of the screw 23 is disposed between the seat surface 23d of the screw head 23a and the member 2.

  The cap 24 is pushed into the screw 23 in the screw axis direction F so that the cap 24 can be externally fitted to the head 23a. When the cap 24 is pushed in, the gap between the claws 28a and 28a is set to the width of the head 23a of the screw 23. It has elasticity that can be expanded and deformed to the outer diameter. Further, as shown in FIG. 10A, the other locking portions 26 of the cap 24 are inserted between the one locking portion 25 and the outer surface of the screw 23 so that the cap 24 can be pushed in smoothly. An insertion space S14 is formed. When the cap 24 is pushed into the head 23a of the screw 23 and the outer fitting portion 28 is inserted into the insertion space S14 while the cap 24 is expanded in diameter when the cap 24 is pushed into the head portion 23a of the screw 23, the claw 28a becomes the gap S13. When the cap 24 reaches the same height position, the cap 24 is elastically deformed and the claw 28a is automatically inserted into the gap S13. Therefore, the cap 24 is securely fitted on the head 23a of the screw 23 and the claw 28a is seated. It can be locked to the surface 23d.

  The anti-rotation structure 20 of the present invention can be used to prevent the screw 3 from rotating by attaching the cap 24 to the screw head 3a, regardless of the screw rotation direction E in the tightening stop position of the screw 3. It is constituted as follows. As shown in FIG. 13, the rotation stopper structure 20 of the present invention has a size Bt of one locking portion 25 of the member 2, a size Bs of an arrangement space for the other locking portion formed other than the one locking portion, and a cap 24. The size Ct of the other locking portion 6 and the size Cs of the one locking portion arrangement space formed other than the other locking portion are external fitting positions at which the other locking portion 26 collides with the one locking portion 25. In the outer fitting position shifted from the outer fitting position pitch angle θ in the screw rotation direction, the one locking portion 25 or the other locking portion 26 is placed in each arrangement space without causing the one locking portion 25 and the other locking portion 26 to collide with each other. Is sized so that it can be placed.

  The rotation stopping structure 20 according to the present invention thus configured allows the cap 24 when the other locking portion 26 of the cap 24 collides with the one locking portion 25 of the member 2 when the cap 24 is to be fitted on the screw head 23a. 24 is rotated by an external fitting position pitch angle θ in the screw rotation direction E from the external fitting position, so that the other locking portion 26 of the cap 24 is placed in the arrangement space for the other locking portion of the member 2 and the one engagement of the cap 24. Since the stopper placement space can be opposed to the one locking portion 25 of the member 2, the cap 24 is pushed into the screw head 23a as it is, so that the cap 24 is fitted onto the head 23a of the screw 23, The other locking portion 26 of the cap 24 can be locked to the one locking portion 25 of the member 2. As a result, the anti-rotation structure 1 of the present invention can prevent the screw 23 from rotating by externally fitting the cap 24 to the head portion 23a of the screw 23 regardless of the screw 23 in the screw rotation direction E. Can be.

It should be noted that the other locking portion 26 is disposed on the one locking portion 25 at an outer fitting position where the outer fitting position pitch angle θ is shifted in the screw rotation direction from the outer fitting position at which the other locking portion 26 collides with the one locking portion 25. The conditions for preventing the cap 24 from being externally fitted to the screw head 3a due to the collision are as follows: the external fitting position pitch angle θ in the screw rotation direction of the external fitting position where the external fitting can be re-fitted, and the other locking portion 26 of the cap 24. Assuming that the pitch angle α in the screw rotation direction and the pitch angle β in the screw rotation direction of the one locking portion 25 of the member 2 are the same as in the first embodiment, “No. 1” to “No. 4” shown below. When any one of the conditions is met.
Part 1: α = θ
Part 2: β = θ
Part 3: β <θ and nβ = θ (where n is an integer)
Part 4: β ≧ θ and θ + β = α

  The anti-rotation structure 20 of the present invention has the angles θ, α, and β written in the upper frame of each of FIGS. 14 to 16, and the left side of the left and right drawings shown in the middle frame. The state in which the other locking portion 26 and the one locking portion 25 collide is shown, and the right side drawing shows a state where the cap 24 is rotated by the external fitting position pitch angle θ and is re-fitted, and falls within the lower frame. “No. 1” to “No. 4” shown above, and those that are left blank are cases that do not correspond to any of the conditions of “No. 1” to “No. 4”, and are reattached after the collision. It shows that you can.

  The anti-rotation structure 20 of the present invention is screwed from the external fitting position where the other locking portion 26 collides with the one locking portion 25, for example, corresponding to any of the conditions “No. 1” to “No. 4”. There is a case where the cap 24 cannot be externally attached to the screw head 3a because the other locking portion 26 collides with the one locking portion 25 at the external fitting position shifted in the rotational direction by the pitch angle θ. In this case, when the other locking portion 26 of the cap 24 collides with the one locking portion 25 of the member 2 when trying to fit the cap 24 to the screw head 23a, the screw 23 is moved from the original tightening stop position. Further, it is necessary to change the tightening position of the screw 23 by appropriately shifting the screw 23 in the screw rotation direction E by tightening or loosening, etc., and to push the cap 24 into the screw 23 in the screw axis direction F and to externally fit the head 23a. is there.

  The rotation stopping structure 20 of the present invention has a structure in which the cap 24 protrudes from the surface of the member 2, but the present invention is not limited to this and is not shown in the figure, but is the same as in the first embodiment. It is also possible to form a recess in the member 2 so that the head 3a and the cap 24 of the screw 3 are embedded in the recess so as not to protrude from the surface of the member. In this case, the one locking portion 25 may be protruded from the inner peripheral surface of the recess. Further, the cap 24 is provided with a lateral concave portion at a position excluding the other engaging portion 26 on the periphery of the cover plate portion 27, and a cap (for example, a tip of a minus driver) is inserted into the lateral concave portion by inserting a sharp tool. 24 may be easily removable.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of a rotation stopping structure of the present invention, and FIG. (A) is a bottom view in which a cap is fitted on the head of a screw provided in a member, and FIG. It is an enlarged view of the part enclosed with the dashed-dotted line a in (A). FIG. 2 is a side view taken along a roll line in FIG. FIG. 2A is a bottom view of the member provided with a screw indicated by a two-dot chain line, and FIG. 2B is an enlarged view of a portion surrounded by the one-dot chain line C in FIG. FIG. 3A is a perspective view in which a portion surrounded by a one-dot chain line C in FIG. 3A is enlarged and turned upside down, and FIG. 2B is a sectional view taken along a knee line in FIG. A side view upside down, FIG. 3C is a side view of the cross section taken along the hoe line in FIG. 3B and turned upside down. The cap in the same embodiment is shown, wherein FIG. (A) is a perspective view, FIG. (B) is a bottom view in a state of being externally fitted to a screw head indicated by a one-dot chain line, and FIG. FIG. FIG. 2 is a side view of a member provided with a screw and a cap that are inverted upside down in the same embodiment, in which FIG. (A) shows the member and cap separated, and FIG. It shows the middle of the external fitting of a pair of opposed outer surfaces of the screw head with the claw of the other locking part whose leg is deformed. In the same embodiment, it is a bottom view showing a state in which a cap is externally fitted and attached to the head of a screw provided in the member, and FIG. Fig. (B) shows the screw and cap shifted 15 ° clockwise from Fig. (A), Fig. (C) shows the screw and cap counterclockwise 15 ° shifted from Fig. (A). It is a thing. In the same embodiment, when the pair of other locking portions indicated by a broken line of the cap to be externally fitted to the screw head collides with the one locking portion of the member, Is a pair of other locking portions rotated by a pitch angle θ (θ = 60 °) in the screw rotation direction from the external fitting position where the two are colliding with each other. FIG. (A) shows the pitch angle β in the screw rotation direction of the one locking part of the member, the size Bt of the one locking part of the part, and the arrangement space for the other locking part formed other than the one locking part of the part. The size Bs is shown, and FIG. (B) shows the pitch angle θ in the screw rotation direction at the external fitting position where the cap can be re-fitted with respect to the screw head, the size Ct of the other locking portion 6 of the cap, It shows the size Cs of the one engaging portion arrangement space formed other than the other engaging portion of the cap and the pitch angle α in the screw rotation direction of the other engaging portion of the cap. The 2nd Embodiment of this invention rotation stop structure is shown, Comprising: FIG. (A) is a top view of the aspect which made the recessed part for rotation tools of the screw head into the negative | minus shape, FIG. (B) is a figure ( It is the front view which cross-sectioned along the ha ha in A). Fig. (A) is a plan view of a mode in which the concave portion for the rotating tool of the screw head is formed in a plus shape, and Fig. (B) is a front view taken along the tote line in Fig. (A). Fig. (A) is a plan view of an embodiment in which a concave part for a rotating tool of a screw head is formed in a hexagonal hole shape, and Fig. (B) is a front view taken along a teach line in Fig. (A). FIG. (A) shows the pitch angle β in the screw rotation direction of the one locking part of the member, the size Bt of the one locking part of the part, and the arrangement space for the other locking part formed other than the one locking part of the part. The size Bs is shown. FIGS. (B) to (C) show the external fitting position pitch angle θ in the screw rotation direction of the external fitting position where the cap can be re-fitted with respect to the screw head, and the other relation of the cap. It shows the size Ct of the stopper, the size Cs of the one engaging part arrangement space formed other than the other engaging part of the cap, and the pitch angle α in the screw rotating direction of the other engaging part of the cap. FIGS. (A) to (H) show before and after re-fitting of the cap in each aspect in which the concave part for the turning tool of the screw head has a negative shape and the number of one locking part and the other locking part is different. . FIGS. (A) to (H) show the front and back of the cap refit in each aspect in which the number of the one locking portion and the other locking portion is different when the recess for the rotating tool of the screw head is a plus shape. . FIGS. (A) to (H) show the front and rear of cap re-engagement in each aspect where the number of the one latching portion and the other latching portion is different when the recess for the rotary tool on the screw head has a hexagonal hole shape. is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Present invention structure 2 ... Member 3 ... Screw 3a ... Head 3b ... Top surface 3c ... Outer side surface 3c-1, 3c-2, 3c-3 ... Two opposing outer side surfaces 3d ... Seat surface 4 ... Cap 5 ... One locking portion (formed on member 2) 6 ... (formed on cap 4) other locking portion 6a ... Claw 7 ... Cover plate portion 10 ... Recess 12 ... Projection 26 ... Distant ring
16 ... Lateral recess S3 ... Gap

Claims (1)

Fitted around the cap to the head of the screw provided in the member so as not to idle in the screw rotation direction, while the locking portion is provided facing the outer surface of the cap to the member, the other on the outer surface of the cap In the screw rotation stopping structure in which the locking portion is provided and the other locking portion of the cap is locked to the one locking portion of the member in the screw rotation direction, thereby preventing the screw from rotating by the cap . The outer fitting position of the cap that can be re-fitted to the screw head is shifted by a predetermined angle in the screw rotation direction, and the other locking portion formed other than the one locking portion and the one locking portion of the member. Each size of the arrangement space for use, and each size of the arrangement space for one locking portion formed other than the other locking portion of the cap and the other locking portion are arranged in the one locking portion of the member. The other side of the cap In the outer fitting position shifted by the predetermined angle in the screw rotation direction from the outer fitting position where the parts collide, the one locking part of the member and the other locking part of the cap do not collide with each other in each arrangement space. Screw rotation stop structure characterized by its size .

Images