The present invention makes it possible to avoid a catching phenomenon in which smooth rotation is prevented by a small screw being caught on an inclined surface of a washer due to screwing, and to also reduce processing costs. In this fastening structure, a threaded shaft (1a) of a bolt (1) for mounting a mounting object is passed through a mount hole of a mount member (2) until the tip portion protrudes, and a small screw (5) attached to a nut (4) on the tip portion via a washer (3) is screwed, thereby fixing the mounting object to the mount member (2). The washer (3) has: an inclined surface (3b) formed on a first surface (3A) facing the nut (4); and a second surface (3B) which is a flat surface on the opposite side to the first surface (3A). The inclined surface (3b) is formed such that its height gradually decreases in a tightening direction of the nut (4). The small screw (5) with a spherical tip (5b) is screwed into the nut (4) such that the screw axis is parallel to the axis of the nut (4), and the tip (5b) of the small screw (5) protrudes and is in contact with the inclined surface (3b). The inclined surface (3b) has a smaller friction coefficient than the second surface (3B) of the washer (3).
A nut 1 is provided a first surface 1A in which a slope portion, in which height is gradually formed to lower toward the tightening rotation direction of the nut, is provided according to the circumferential direction. A washer 2 is provided with a second surface 2A that has the slope portion formed corresponding to a slope portion 1Aa of the first surface 1A according to the circumferential direction is provided. The washer and the nut are provided such that the slope portion of the first surface and the second surface are overlapped and superposing up and down mutually, configuration of the nut and the washer are formed such that they are coincident with the circumferential direction, in the state that the slope portion 1Aa of the first surface 1A and a slope portion 2Aa on the second surface are overlapped without the clearance.
F16B 39/24 - Locking of screws, bolts, or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
The present invention provides a nut that has a simple structure, does not loosen, is manufactured at low cost, and, when necessary, can be easily loosened. Provided is a nut (1) that is screwed onto a screw rod (4) penetrating an object (3) to be mounted, and comes into contact with a mounting surface (3a) of the object (3) to be mounted. The nut (1) has a nut body (1a), which has at least one recess (1b) with a circular cross-section on a surface at the side of the object (3) to be mounted, and a steel ball (2) which is installed to be rollable in the recess (1b) of the nut body (1a). The recess (1b) has a size that allows the steel ball (2) to roll, a flat inclined bottom surface, a depth at a rear end in a nut-loosening direction such that the steel ball (2) is entirely accommodated in the recess (1b), and a depth at a leading end in the nut-loosening direction such that a portion of the steel ball (2) protrudes from the recess (1b).
[Problem] To provide a washer, a nut, and a fastening structure that have a simple structure for preventing loosening of the nut or bolt, involve low manufacturing costs, and are easy to loosen when needed. [Solution] Provided is a washer 1 that is attached between an attachment surface Sa of an attachment object S and a nut 2 (or a head of a bolt). The washer 1 comprises: a washer body 1A; and a ring-shaped protruding part 1B that is provided on an upper side of the washer body 1A, and has a diameter equal to or smaller than the outer shape of the washer body 1A. At least one groove-like recessed part 1Aa is provided on an upper surface of the protruding part 1B, and a ball 4 is provided in the recessed part 1Aa so as to be able to roll in a longitudinal direction of the recessed part. Also provided is a nut with similar structure.
F16B 43/00 - Washers or equivalent devicesOther devices for supporting bolt-heads or nuts
F16B 39/24 - Locking of screws, bolts, or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
[Problem] To prevent by means of a simple configuration unintended rotation of a square washer induced by another member. [Solution] This square washer is used in a state of being sandwiched between an attachment surface Sa of an attachment subject S and a nut 2 or the head of a bolt. A washer body 1A has a polygonal shape when viewed from a direction orthogonal to the surface facing a nut 2, and a central concave portion 1Aa is formed on the side facing the attachment surface Sa. The outer shape of the central concave portion 1Aa is formed so as to be the same as that of the nut 2 or the head of the bolt, or so as to be larger than the outer shape of the nut 2 or the head of the bolt, and the washer body 1A has elasticity such that a central portion of the washer body 1A is displaced toward the attachment surface Sa when fastened by the nut 2 or the head of the bolt.
Provided are a washer that has a non-rotating function and does not damage an attachment surface at the time of fastening and loosening without increasing the number of components, and a fastening structure that prevents accompanying rotation of a bolt by applying the non-rotating function.
Provided are a washer that has a non-rotating function and does not damage an attachment surface at the time of fastening and loosening without increasing the number of components, and a fastening structure that prevents accompanying rotation of a bolt by applying the non-rotating function.
Disclosed is a washer 1 is used by being sandwiched between an attachment surface Sa of an object S to be attached and a nut 2 or a bolt head. A first annular protrusion 3 is formed on a side of the attachment surface Sa. An inner shape of the first annular protrusion 3 is larger than an outer shape of the nut 2 or the bolt head.
The present invention enables easy loosening for the purpose of maintenance or the like, without causing loosing in a fastened state. This fastening structure is for fixing an attachment object (11) to a to-be-attached member by applying a nut (1) to a leading end of a screw rod (12) with a washer (2) therebetween. The nut (1) is provided with a first surface (1A) having a plurality of inclined surface portions (1Aa) formed along the circumferential direction such that the height thereof gradually decreases in the tightening rotation direction. The washer (2) is provided with a second surface (2A) having a plurality of inclined surface portions (2Aa) formed along the circumferential direction so as to correspond to the respective inclined surface portions (1Aa) of the first surface (1A). The washer (2) and the nut (1) are vertically overlapped and attached to each other such that the inclined surface portions of the first surface (1A) and the inclined surface portions of the second surface (2A) engage with each other. The external forms of the nut (1) and the washer (2) coincide with each other along the circumferential direction in a state where the inclined surface portions (1Aa) of the first surface (1A) and the inclined surface portions (2Aa) of the second surface (2A) engage with each other without a gap.
F16B 43/00 - Washers or equivalent devicesOther devices for supporting bolt-heads or nuts
F16B 39/24 - Locking of screws, bolts, or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
8.
WASHER AND FASTENING STRUCTURE, AND FASTENING RELEASE METHOD
[Problem] To enable easy loosening for the purpose of maintenance or the like, without causing loosing in a fastened state. [Solution] This fastening structure fastens an attachment object 11 to a to-be-attached member 13 by applying a nut 1 to a leading end of a screw rod 12 with a washer 2 therebetween. The nut 1 is provided with a first surface 1A having an inclined surface portion 1Aa formed along the circumferential direction such that the height thereof gradually decreases in the tightening rotation direction. The washer 2 is provided with a second surface 2A having an inclined surface portion 2Aa formed along the circumferential direction so as to correspond to the inclined surface portion 1Aa of the first surface 1A. The washer 2 and the nut 1 are vertically overlapped and attached to each other such that the inclined surface portion of the first surface 1A and the inclined surface portion of the second surface 2A engage with each other. The external forms of the nut 1 and the washer 2 coincide with each other along the circumferential direction in a state where the inclined surface portion 1Aa of the first surface 1A and the inclined surface portion 2Aa of the second surface 2A engage with each other without a gap.
F16B 39/24 - Locking of screws, bolts, or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
c. The first side (the inclined surface) and the second side of the washer have a different surface roughness, and the first side has a smaller coefficient of friction than the second side.
patents
