JP2012189144A - Screw and method for mounting screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw that improves workability while having superior appearance when mounted, and to provide a method for mounting the screw.SOLUTION: The screw 1 includes: a shaft 3 on which a thread 11 is formed; a head 5 formed on a base end side of the shaft 3; and a cap 7 pivotably disposed around the head 5. The cap 7 pivots around the head 5 as a center and inclines in the axial direction of the shaft 3.

Description

  The present invention relates to a screw and a method for attaching the screw.

  The screw is generally composed of a shaft portion in which a helical thread is formed and a head portion formed on the proximal end side of the shaft portion (see, for example, Non-Patent Documents 1 and 2).

Tamura Osamu “Knowledge of Screw”, Yokenkan Publishing, January 25, 2008 Kazuo Kadota, “Neji no Kiso”, Nikkan Kogyo Shimbun, February 28, 2007

  By the way, in the conventional screw, when screwed into a member having an inclined surface, if it is screwed in the vertical direction with respect to the inclined surface, a gap is generated between the inclined surface and the lower surface of the head, and the appearance is improved. There was a problem of being bad. Further, in order to eliminate this gap, there is a problem that a step of spot facing is required for the member, and workability is poor.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a screw and a screw mounting method capable of improving workability while being excellent in appearance when mounted. And

  In order to solve the above-described problem, a screw according to the present invention is arranged so as to surround a head part, a shaft part in which a thread is formed, a head part formed on a proximal end side of the shaft part, and a head part. And a cap portion that is pivotably provided on the portion.

  In this screw, the cap is pivotally provided on the head. Thereby, when attaching a screw to an inclined surface, since a cap part pivots according to an inclined surface, a clearance gap is not formed between an inclined surface and a cap part. Therefore, the external appearance when attached can be made excellent. Thereby, since the spot facing process for eliminating the clearance gap between inclined surfaces is not required, workability | operativity can be improved.

  Also, the head has a spherical shape, and a groove is formed in the spherical surface of the head along the axial direction of the shaft portion, and an engaging portion that engages with the groove is formed on the inner surface of the cap portion. In addition, the cap portion slides along the groove on the head and is restricted from moving in the direction orthogonal to the axial direction. According to such a configuration, since the movement of the cap portion in the direction orthogonal to the axial direction, that is, the direction in which the screw is tightened is restricted, the screw can be tightened by the cap portion.

  In addition, the screw mounting method according to the present invention includes a shaft portion on which a screw thread is formed, a head formed on the proximal end side of the shaft portion, and is disposed so as to surround the head. A method of attaching a screw provided with a movable cap portion to a member, wherein when the member is screwed to the member, the cap surface and the surface of the cap portion facing the surface are in contact with each other. It is characterized by pivoting the part.

  In this screw attachment method, when screwing onto the member, the cap is pivoted so that the surface of the member and the surface of the cap facing the surface of the member abut. Thereby, even if the surface of a member is an inclined surface, a clearance gap is not formed between the inclined surface and a cap part. Therefore, the external appearance when attached can be made excellent. Thereby, since the spot facing process for eliminating the clearance gap between inclined surfaces is not required, workability | operativity can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, workability | operativity can be improved, making it excellent in the external appearance at the time of attachment.

It is a figure showing a screw concerning one embodiment of the present invention. It is a figure which shows the axial part and head part of a screw which are shown in FIG. It is a figure which shows the cap part of the screw shown in FIG. It is a figure for demonstrating the movement of a cap. It is the figure which looked at the screw from the top. It is a side view of a cap. It is a cross-sectional view of the head. It is a cross-sectional view of a cap. It is a figure which shows the state in which the conventional screw was attached. It is a figure which shows the state in which the screw of this embodiment was attached. It is a figure which shows the screw which concerns on a modification.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted.

  FIG. 1 is a view showing a screw according to an embodiment of the present invention. 2 is a view showing a shaft portion and a head portion of the screw shown in FIG. 1, and FIG. 3 is a view showing a cap portion of the screw shown in FIG.

  As shown in each figure, the screw 1 includes a shaft portion 3, a head portion 5 provided on one end (base end) side of the shaft portion 3, and a shade that is pivotally connected to the head portion 5. Part 7. The screw 1 is made of, for example, a metal material. The surface of the screw 1 can be subjected to electroplating, electroless plating, alumite treatment, black dyeing or the like.

  The screw 1 is, for example, a metric coarse screw, a metric fine screw, an inch coarse screw, an inch fine screw, a unified coarse screw, a unified fine screw, a metric trapezoidal screw, a miniature screw, a pipe taper screw, a pipe parallel screw, an SI screw, In the present embodiment, a screw having a hexagonal shape and a shaft portion 3 being a metric coarse screw will be described as an example.

  Subsequently, each configuration of the screw 1 will be described in detail. In the following description, a mode in which the screw 1 is tightened by the cap portion 7 will be described.

  The shaft portion 3 is a columnar member in which a thread 11 is formed. In the shaft part 3, the dimension of the thread part 13 in which the thread 11 is formed is appropriately set depending on the dimension of the member to be screwed. The thread portion 11 is formed with a thread 11 at a predetermined pitch in a spiral shape. The length of the shaft part 3 is, for example, about 3 mm to 150 mm, and the diameter of the shaft part 3 is about 2 mm to 20 mm.

  The cutting edge shape of the thread 11 is formed in accordance with the type of the screw 1 such as a basic thread-type screw, a triangular screw, a trapezoidal screw, a square screw, a bulb screw, a saw blade screw, a pipe taper screw, a pipe parallel screw, and the like. . The shape of the tip (screw tip) of the thread 11 is, for example, a rough tip, a chamfered tip, a flat tip, a round tip, a pointed tip, a whole pointed tip, a rod tip, a half rod tip, a hollow tip, a cutting edge tip, a tapping screw. A tip F, a tapping screw tip C, a wood screw, a drill screw, a coarse thread, or the like is formed according to the type of the screw 1. In the screw 1 of this embodiment, the cutting edge shape of the thread 11 is a basic thread, and the tip shape is a flat tip.

  The head 5 has a spherical shape and is integrally formed with the shaft portion 3. The upper end of the head 5 is a flat surface 5a. A groove 15 is formed in the spherical surface of the head portion 5 along the axial direction of the shaft portion 3. A plurality of grooves 15 are formed at a predetermined pitch in the circumferential direction of the head 5. As shown in FIG. 2B, the groove 15 has a substantially V shape. The diameter of the circumscribed circle of the head 5 is, for example, about 2 mm to 30 mm. In addition, as a method of integrally molding the shaft portion 3 and the head portion 5, there are press working, shaving, and the like. Moreover, the head 5 should just be connected with the axial part 3, and after shape | molding the head 5 and the axial part 3, respectively, the head 5 is welded to the axial part 3, adhesion | attachment, screwing, pinning, etc. You may connect. The head 5 may be coated with a resin such as Teflon (registered trademark). Thereby, the improvement of the sliding (pivoting) property of the cap part 7 mentioned later can be aimed at.

  The cap portion 7 is a cylindrical member, is disposed so as to surround the head portion 5, and is attached to the head portion 5. As shown in FIG. 3B, the outer shape of the cap portion 7 has a hexagonal shape. A through hole H is formed in the central portion of the cap portion 7, and the head 5 is inserted into the through hole H. The inner peripheral surface (inner surface) 7a of the cap portion 7 has a shape along the spherical surface of the head 5, and a convex portion (engaging portion) 17 protruding inward is formed on the inner peripheral surface 7a. ing. In other words, a recess is formed in the inner peripheral surface 7a. The convex portion 17 has a shape corresponding to (opposed to) the groove 15 of the head portion 5 and is formed corresponding to the groove 15 along the axial direction of the through hole H of the cap portion 7. That is, the same number of protrusions 17 as the grooves 15 are formed.

  The cap portion 7 is press-fitted into the head portion 5 from above the head portion 5. Specifically, the clearance of the cap portion 7 is set to a minus tolerance (−5 mm to 0 mm), the clearance of the head portion 5 is set to a plus tolerance (0 mm to 5 mm), and the cap portion 7 is press-fitted into the head portion 5. At this time, the convex portion 17 of the cap portion 7 engages with the groove 15 of the head portion 5. Thereby, the cap portion 7 is provided to be slidable along the groove 15 while being restricted from moving in a direction orthogonal to the axial direction of the shaft portion 3. The outer diameter of the cap portion 7 is, for example, about 4 mm to 40 mm, and the inner diameter of the cap portion 7 is preferably 5% to 25% larger than the diameter of the circumscribed circle of the head portion 5. More preferably, it is -20%. Thereby, the movement of the cap part 7 becomes smooth.

  When the outer diameter of the cap portion 7 is about 15 mm to 40 mm, it is preferable to incorporate a ball (not shown) between the groove 15 of the head portion 5 and the convex portion 17 of the cap portion 7. Thereby, the movement of the cap part 7 can be made smooth. Further, when the outer diameter of the cap portion 7 is about 4 mm to 15 mm, since the friction load between the groove 15 and the convex portion 17 is small, a smooth movement can be obtained without incorporating a ball. In this case, processing can be performed easily and cost can be reduced.

  Next, the movement of the cap portion 7 will be described with reference to FIG. 4A and 4B are diagrams for explaining the movement of the shade 7, in which FIG. 4A is a diagram showing the shade in a normal state (a state where the shade is not slid), and FIG. It is a figure which shows the state which carried out. As shown in FIG. 4, the cap portion 7 of the screw 1 is configured so that the convex portion 17 provided on the inner peripheral surface 7 a slides along the groove 15 of the head portion 5, so that the cap portion 7 becomes the shaft portion 3. Inclined with respect to (head 5). At this time, the shade portion 7 is inclined in a range of 0 ° to 30 ° with respect to the axial direction of the shaft portion 3. Further, when the convex portion 17 of the cap portion 7 is engaged with the groove 15 of the head portion 5, the movement of the cap portion 7 in the circumferential direction of the head portion 5 is restricted. Thereby, the screw 1 can be tightened by the cap portion 7.

  Next, the shape of the screw 1 will be described. FIG. 5 is a view of the screw as seen from above.

  As shown in FIG. 5, the screw 1 can take various forms. For example, as shown in FIGS. 5 (a) to 5 (d), the screw 1 slides on the flat surface 5 a of the head 5, a cross hole, a Phillips type, an S type, a plus / minus, a hexagonal hole, a square hole. Alternatively, a hex lobe hole, a triangular hole, a plurality of holes, a T-groove, or a Y-groove may be formed and tightened by the head 5. At this time, it is not necessary to provide the groove | channel 15 and the convex part 17 in the head 5 and the cap part 7, respectively. Further, as shown in FIGS. 5E to 5H, when the screw 1 is tightened by the cap portion 7, the screw 1 forms the outer shape of the cap portion 7 in a hexagonal shape, or the cap portion 7. Concavities and convexities may be formed on the outer peripheral surface, or the shape of the cap portion 7 may be picked. In addition, the outer shape of the cap portion 7 may be a sphere, a square, a triangle, a circle, or the like.

  FIG. 6 is a side view of the cap. As shown in FIG. 6, the cap portion 7 can have a shape corresponding to the type (use) of the screw 1, and can have a shape surrounding the head 5 or a shape covering the head 5. The cap portion 7 is, for example, a pan, a plate, a round plate, a truss, a bind, a low head, a very low head, a cheese, a circle, a flat circle, a pleasure, a hexagon, a square, a hexabula, an ellipse, a washer head, an eyelet, a hook, a U-shape, Or it can be a butterfly shape.

  FIG. 7 is a cross-sectional view of the head, and FIG. 8 is a cross-sectional view of the cap. As shown in FIG.7 and FIG.8, the head 5 and the cap part 7 should just exhibit the shape corresponding to each. That is, in the case of the configuration in which the screw 1 is tightened by the head portion 5, it is not necessary to have a shape in which the head portion 5 and the shade portion 7 are engaged as shown in FIGS. 7 (a) and 8 (a). . On the other hand, in the case of the configuration in which the screw 1 is tightened by the head portion 5 or the cap portion 7, as shown in FIGS. 7B to 7H and FIGS. 8B to 8 h, the head portion 5 and the cap portion 7. And at least engage (mesh).

  Then, the effect | action and effect of the screw 1 which concern on this embodiment are demonstrated. FIG. 9 is a diagram illustrating a state in which a conventional screw is attached, and FIG. 10 is a diagram illustrating a state in which the screw according to the present embodiment is attached.

  As shown in FIG. 9 (a), when the conventional screw 1A is screwed in and attached to the inclined surface S of the member B in the vertical direction, between the inclined surface S and the lower surface of the head 5A of the screw 1A. A gap G is formed. In order to eliminate the gap G, as shown in FIG. 9B, it was necessary to form a counterbore hole A by subjecting the member to be screwed to a counterbore process.

  On the other hand, in the screw 1 of this embodiment, as shown in FIG. 10A, the cap portion 7 is provided so as to be pivotable with respect to the head portion 5. (In this embodiment, the convex portion 17 of the cap portion 7 slides along the groove 15 of the head portion 5), and the cap portion 7 is inclined with respect to the axial direction of the shaft portion 3. That is, when the screw 1 is attached, when the shaft portion 3 of the screw 1 is screwed to the member B, the inclined surface S (surface) of the member B and the lower surface of the cap portion 7 (surface facing the inclined surface S). ) Is caused to pivot so that they come into contact with each other in parallel. Accordingly, the gap G between the lower surface of the shade portion 7 and the inclined surface S can be eliminated.

  Therefore, the appearance can be improved, and it is not necessary to form the spot facing hole A for eliminating the gap G, and the workability can be improved. Further, as shown in FIG. 10 (b), even when the spot facing hole A is formed in advance, the cap portion 7 is similarly pivoted and inclined, so that the inclined surface S and the screw 1 are The upper surface, that is, the upper surface of the cap portion 7 can be made substantially parallel. Thereby, the external appearance at the time of attaching the screw 1 can be made more favorable.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, from the viewpoint of the appearance of the screw 1, the cap portion 7 is press-fitted from the upper side of the head portion 5, but as shown in FIG. You may press fit. In this case, the fastening force can be increased.

  Moreover, in the said embodiment, although the head 5 is press-fit in the shade part 7, the shade part 7 and the head 5 may be connected by another method. For example, the cap portion 7 is divided into two or more parts, molded, assembled so as to sandwich the head portion 5, and joined by welding, bonding, screwing, or pinning, and the cap portion 7 and the head portion. 5 may be connected. Alternatively, the cap portion 7 may be divided into two or more parts at the top and bottom, and the two or more parts themselves may be tightened as a screw structure.

  Moreover, in the said embodiment, although the screw 1 formed with the metal material was illustrated, the material of the screw 1 may be resin, ceramic, wood, rubber, etc. Thus, by changing the material, it can be developed and used in various applications such as industrial product manufacturing and food manufacturing. Further, when heat resistance, strength, weather resistance, and the like are required, it is preferable to use a metal material that has been subjected to various treatments or stainless steel. Further, when a resin material is used, it can be colored according to the use and preference, and therefore, it is preferable when it is used for a portion where appearance is important.

  Moreover, in the said embodiment, while forming the groove | channel 15 in the spherical surface of the head 5, the convex part 17 is formed in the internal peripheral surface 7a of the cap part 7, and it is set as the shape which the groove | channel 15 and the convex part 17 engage. However, the groove | channel 15 and the convex part 17 do not need to be formed. That is, when the screw 1 is tightened by the cap portion 7, it is necessary to form the groove 15 and the convex portion 17, but when the screw 1 is tightened only by the head 5, the groove 15 and the convex portion are required. 17 need not necessarily be formed. In this case, the cap 7 is pivotally attached to the head 5, that is, attached in a pivotable state. The pivotable state is a state of spherical movement. With such a configuration, the cap portion 7 pivots in the range of 0 ° to 360 ° in the circumferential direction around the center point of the head 5.

  Moreover, in the said embodiment, although the cap part 7 is the shape which surrounds the head 5, ie, the shape in which the through-hole H which the flat surface 5a of the head 5 exposes was formed, the head 5 is completely The shape may be covered (see FIGS. 6B and 6D).

  DESCRIPTION OF SYMBOLS 1 ... Screw, 3 ... Shaft part, 5 ... Head part, 7 ... Cap part, 7a ... Inner peripheral surface (inner surface), 11 ... Screw thread, 15 ... Groove, 17 ... Convex part (engagement part), B ... Member .

Claims (3)

A shaft portion formed with a thread;
A head formed on the base end side of the shaft portion;
A screw comprising: a cap portion disposed so as to surround the head portion and pivotally provided on the head portion. The head has a spherical shape,
A groove is formed in the spherical surface of the head along the axial direction of the shaft portion,
An engagement portion that engages with the groove is formed on the inner surface of the shade portion,
The screw according to claim 1, wherein the cap portion slides along the groove of the head portion and is restricted from moving in a direction orthogonal to the axial direction. A shaft portion formed with a screw thread, a head portion formed on the proximal end side of the shaft portion, a cap portion disposed so as to surround the head portion and pivotally provided on the head portion; A method of attaching a screw comprising:
The screw mounting method, wherein when the member is screwed, the cap portion is pivoted so that a surface of the member and a surface of the cap portion facing the surface contact each other.

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