Screw loosening prevention spectacles

Abstract

To provide spectacles capable of easily preventing screw loosening that a screw loosens as they are used in connection means for screwing such as hinge connection means and screw connection means.SOLUTION: Screw loosening prevention spectacles comprise a plurality of components including: a front frame composed of left and right rims and a bridge connecting the same in the center; left and right wraparound end pieces one ends of which are connected to ends of the left and right rims; and left and right temples whose front ends are connected to the other ends of the left and right wraparound end pieces and which are connected to the back of the front frame. Connection means which goes male screws through screw holes h1 and h2 born in a connecting part C1 provided for one component and a connected part C2 provided for the other component respectively to screw the connecting part C1 and the connected part C2. The connection means for screwing is provided with loosening preventing screw mechanism which covers the male screws with buffer springs to screw, and can prevent screw loosening.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to eyeglasses that use a screw-down mechanism that covers a spring. [Background technology]

[0002] As shown in FIG. 13(a), a pair of eyeglasses 110 that is generally available on the market is composed of a number of components, including a front frame 112 consisting of left and right rims (112L, 112R) on which lenses are attached and a bridge 112B that connects them in the center, left and right end pieces 116 (116L, 116R) one end of which is connected to the ends of the left and right rims (112L, 112R), and left and right temples 114 (114L, 114R) whose front ends are connected to the other ends of the left and right end pieces 116 (116L, 116R) and connected to the rear of the front frame 112.

[0003] As shown in Fig. 12, many connecting means have been proposed for connecting the components, such as (a) hinge connecting means 120H, (b) screw connecting means 120S, (c) magnet connecting means 120M, and (d) insertion connecting means 120I. Among them, the screw-tightening connecting means of (a) hinge connecting means and (b) screw connecting means are widely used. That is, the screw-tightening connecting means of Fig. 12(a) and (b) is a connecting means for fastening a connecting part C1 provided on one component and a connected part C2 provided on a component to be connected thereto by passing a male screw 40 consisting of a head and a screw-in part through screw holes h1, h2 drilled in the connecting part C1 and / or the connected part C2.

[0004] Such screw-tightening connection means are used between the upper and lower joint pieces b, d of the left and right end pieces 116 (116L, 116R) (Fig. 13(b) and Fig. 14) and between the left and right end pieces 116 (116L, 116R) and the left and right temples 114 (114L, 114R) (Fig. 14), as shown in Fig. 13(b) and Fig. 14. For example, referring to Fig. 14, the connection part C1 of the one-piece piece having a screw hole of the left temple 114L can be connected to the connected part C2 of the two-piece piece having a screw hole of the left end piece 116L by the hinge connection means 120H (Fig. 12(a)).

[0005] Patent Document 1 also describes a conventional method in which, in order to fit lenses into the left and right rims (112L, 112R), gaps provided at the ends of the rims are closed and fixed by a screw connection means (Fig. 12(b)) via left and right end pieces 116 (116L, 116R) brazed to the ends. Referring to Patent Document 1, the joint structure called "Ichi-Kachi" shown in Fig. 13(b) is made by separably integrating an upper joint piece b having a fitting groove a at its inner end portion and a lower joint piece d having a fitting groove c continuous with the fitting groove a at its inner end portion by a screw 40, and the upper and lower end portions g, h of the rims (112L, 112R) are fitted into the fitting grooves a, c of both joint pieces b, d and brazed (see Patent Document 1). Patent Document 2 also describes an end piece 116 (116L, 116R) with a gap q between upper and lower fitting grooves a, c, in which upper and lower end portions g, h of the rims (112L, 112R) are fitted into the fitting grooves a, c, respectively, and soldered, and the upper and lower joint pieces b, d of the end piece 116 are fixed together with male screws 40 (see FIG. 14, Patent Document 1).

[0006] However, in screw-tightened connection means such as the hinge connection means in Fig. 12(a) and the screw connection means in Fig. 12(b), the screws loosen with use, and the temple 114 easily rotates relative to the end piece 116. The period until the temple 114 becomes loose is short, and if the screws are not tightened properly, the male screw 40 will come out of the screw hole. In addition, the male screw 40 that secures the upper and lower joint pieces b and d of the end piece 116 will also loosen over time, causing the lenses to come off.

[0007] Such screw-fastening connection means is also used for the eyeglasses 110 and flip-up sunglasses 60 as shown in Fig. 10. A two-piece connected part C2 with a screw hole and a one-piece connecting part C1 with a screw hole are attached to the upper connecting bridge 112A connecting the upper parts of the left and right rims 112 (112L, 112R) of the eyeglasses 110 and the upper connecting bridge connecting the upper parts of the left and right rims of the flip-up sunglasses 60, respectively, and the connected part C2 and the connecting part C1 are connected by a hinge connecting means (Fig. 12(a)). As shown in Fig. 10, the connected part C2 and the connecting part C1 are provided in two places and connected by the hinge connecting means, so that the flip-up sunglasses 60 can be stably attached to the eyeglasses 110.

[0008] Flip-up sunglasses 60, as shown in Fig. 10, in which the connected part C2 and the connecting part C1 are provided at two places and connected by hinge connection means, are commercially available, but flip-up sunglasses 60, as shown in Fig. 11, in which the connected part C2 and the connecting part C1 are provided at only one place are not commercially available. This is because if the connected part C2 and the connecting part C1 are connected at only one place by hinge connection means, the sunglasses 60 will immediately flap as described above, and will not be able to maintain a constant angle relative to the attached spectacles 110, and will fall due to gravity and overlap with the spectacles 110.

[0009] [Patent Document 1] JP 2002-082315 A [Patent Document 2] Japanese Patent Application Publication No. 59-202432 [Patent Document 3] JP 2008-3283408 A Summary of the Invention [Problem to be solved by the invention]

[0010] If a spring washer is inserted between the male thread 40 and the adjacent connected part C2 or connecting part C1 to solve this problem, the spring washer will bite into the male thread 40, connected part C2, or connecting part C1, becoming too tight and no longer able to perform the spring-up function. Since the tightening of the screw loosens with use, even if there is an appropriate degree of screw tightening, it is impossible to keep this appropriate tightening constant.

[0011] Therefore, the present invention proposes eyeglasses that do not require delicate adjustment of the tightness of screw-tightened connection means such as hinge connection means or screw connection means, and can easily prevent the screws from loosening with use.

[0012] The present invention also proposes an external component that is connected to glasses using a connection means that prevents such screw loosening, and an external component that is connected to glasses using a connection means that prevents screw loosening. [Means for solving the problem]

[0013] (1) Anti-loosening eyeglasses equipped with a mechanism to prevent loosening (Anti-loosening glasses) The screw-loosening prevention eyeglasses according to the present invention are comprised of a plurality of components including a front frame consisting of left and right rims on which lenses are attached and a bridge connecting them at the center, left and right end pieces having one end and the other end connected to the ends of the left and right rims at one end, and left and right temples having front ends connected to the other ends of the left and right end pieces and connected to the rear of the front frame, and the eyeglasses use a connection means in which a connecting part C1 provided on one component and a connected part C2 provided on a component connected to the connecting part C1 are screwed together by passing a male screw consisting of a head and a screw-in part through screw holes h1 and h2 respectively drilled in the connecting part C1 and the connected part C2. The screw-tightening connection means is provided with a loosening prevention screw tightening mechanism that covers the male screw with a shock absorbing spring and tightens the screw, thereby making it possible to prevent the screw from loosening.

[0014] (definition) Hereinafter, in this specification, the above-mentioned anti-loosening screw tightening mechanism will be referred to as the "anti-loosening mechanism", and the screw-tightening connection means equipped with the above-mentioned anti-loosening screw tightening mechanism used in the present invention will be referred to as the "screw-tightening connection means equipped with a loosening prevention mechanism" or the "connection means equipped with a loosening prevention mechanism".

[0015] In this specification, a "screw" refers to a combination of a male screw and a female screw and / or a nut, and "screw-tightening" refers to fastening by screwing a thread formed on or in a male screw with a thread formed on or in a female screw and / or a nut. Also, a "female screw" refers to a thread formed on or in a screw hole provided in an object into which a male screw is inserted (for example, a connecting part C1, a connected part C2, a nut, etc.), and a "nut" is a hollow disk-shaped part with a female screw provided in a central screw hole. (2) Connection means equipped with a mechanism for preventing loosening (2-1) Connection means equipped with a rotating type anti-loosening mechanism

[0016] (Hinge connection means with anti-loosening mechanism) In the screw-loosening prevention eyeglasses according to the present invention, the screw-fastening connection means equipped with the loosening prevention mechanism is a hinge connection means that fits one piece of the connecting part C1 into a valley between two pieces of the connected part C2 and fixes the one piece so that it can rotate between the valleys of the two pieces, a hinge connection means including a loosening prevention mechanism, the hinge having a screw hole h1 is inserted between the grooves of the two blocks, each of which has screw holes h21, h22, and a screw-in portion of a male screw covered with a shock-absorbing spring is inserted through the screw hole h22 of one of the two blocks, penetrates the screw hole h1 of the single block, and is screwed into a female screw provided in the screw hole h21 of the other block, and the head of the male screw presses the outer peripheral edge portion h22s of the screw hole h22 that it abuts against in the screw-in direction of the male screw, thereby fixing the single block of the connecting portion C1 so as to be rotatable between the grooves of the two blocks of the connected portion C2; The shock absorbing spring covering the threaded portion of the male screw is contracted and accommodated inside the screw hole h22 of one of the two pieces of the connected part C2, and the restoring force of the contracted shock absorbing spring acts in opposite directions on the outer peripheral edge h1s of the screw hole h1 of the connecting part C1 and on the head of the male screw.

[0017] The screw-loosening prevention eyeglasses of the present invention have a screw hole peripheral accommodation hole capable of accommodating the head of the male screw provided at the outer peripheral edge h22s of the screw hole h22, and the threaded portion of the male screw covered with a buffer spring is inserted through the screw hole h22 and screwed into the female screw provided in the screw hole h21, while the head of the male screw presses the bottom of the screw hole peripheral accommodation hole in the screwing direction of the male screw, and the buffer spring is contracted and accommodated inside the screw hole h22.

[0018] (Rotary screw connection means with anti-loosening mechanism) In the screw-loosening prevention eyeglasses according to the present invention, the screw-tightening connection means having the loosening prevention mechanism is a rotating screw connection means having a loosening prevention mechanism, which inserts a threaded portion of a male screw covered with a buffer spring through the threaded hole h1 of the connecting portion C1 into the threaded holes h2, h1 provided in the connected portion C2 and the connecting portion C1, respectively, and screws the threaded portion of the male screw into a female screw provided in the threaded hole h2 of the connected portion C2, and holds the buffer spring covering the threaded portion of the male screw between the outer peripheral edge portion h1s of the threaded hole h1 of the connecting portion C1 and the head of the male screw, thereby fixing the connecting portion C1 to be rotatable relative to the connected portion C2, The restoring force of the contracted buffer spring acts in opposite directions on the outer peripheral edge h1s of the screw hole h1 of the connection portion C1 and on the head of the male screw.

[0019] In the screw-loosening prevention eyeglasses of the present invention, a screw hole peripheral accommodation hole capable of accommodating a buffer spring covering the threaded portion of the male screw is provided on the outer peripheral edge h1s of the screw hole h1, and the threaded portion of the male screw covered with the buffer spring is inserted through the screw hole h1 and screwed into the female screw provided in the screw hole h2, and the head of the male screw presses the outer peripheral edge h1s of the screw hole h1 in the threading direction of the male screw, and the buffer spring is contracted and accommodated in the screw hole peripheral accommodation hole.

[0020] (T-shaped washer) The screw-loosening prevention eyeglasses according to the present invention may have a T-shaped washer disposed at the boundary between the connected portion C2 and the connecting portion C1, and the threaded portion of the male screw may pass through a hole in the T-shaped washer. (2-2) Connection means equipped with a fixed anti-loosening mechanism

[0021] (Fixed screw connection means with anti-loosening mechanism) In the screw-loosening prevention eyeglasses according to the present invention, the screw-tightening connection means having the loosening prevention mechanism is a fixed screw connection means having a loosening prevention mechanism, which inserts a threaded portion of a male screw covered with a shock absorbing spring through the threaded hole h1 of the connecting portion C1 into the threaded holes h2, h1 provided in the connected portion C2 and the connecting portion C1, respectively, and screws the threaded portion of the male screw into a female screw provided in the threaded hole h2 of the connected portion C2, and fixes the male screw by having the head of the male screw press the outer peripheral edge portion h1s of the threaded hole h1 of the connecting portion C1 in the screwing direction of the male screw, A buffer spring covering the threaded portion of the male screw is contracted and accommodated inside the screw hole h1, and the restoring force of the contracted buffer spring acts in opposite directions on the outer edge h2s of the screw hole h2 provided in the connected portion C2 and on the head of the male screw.

[0022] In the screw-loosening prevention eyeglasses of the present invention, a screw hole peripheral accommodation hole capable of accommodating the head of the male screw is provided on the outer peripheral edge h1s of the screw hole h1, and the threaded portion of the male screw covered with a buffer spring is inserted through the screw hole h1 and screwed into the female screw provided in the screw hole h2, and the head of the male screw presses the bottom of the screw hole peripheral accommodation hole in the screwing direction of the male screw, and the buffer spring is contracted and accommodated inside the screw hole h1. (3) Examples (3-1) Connections between components

[0023] (Hinge connection means with anti-loosening mechanism; end piece and temple) The screw-loosening prevention eyeglasses according to the present invention are the above screw-loosening prevention eyeglasses, in which a connected part C2 provided at the other end of the end piece and a connecting part C1 provided at the front end of the temple are rotatably connected by a hinge connection means having a loosening prevention mechanism, The hinge connection means having the loosening prevention mechanism is a hinge connection means which fits one piece of the connecting part C1 into a valley between two pieces of the connected part C2 and fixes the one piece so as to be rotatable between the valleys of the two pieces, The single piece having a screw hole h1 is inserted into the gap between the two pieces, each of which has screw holes h21, h22, and the screwing portion of a male screw covered with a buffer spring is inserted through the screw hole h22 of one of the two pieces and penetrates the screw hole h1 of the single piece and is screwed into the female screw provided in the screw hole h21 of the other piece of the two pieces. At the same time, the head of the male screw presses the outer peripheral edge portion h22s of the abutting screw hole h22 in the screwing direction of the male screw, and the single piece of the connecting part C1 is fixed so that it can rotate in the gap between the two pieces of the connected part C2.

[0024] (Screw hole periphery accommodation hole) The screw-loosening prevention eyeglasses of the present invention have a screw hole peripheral accommodation hole capable of accommodating the head of the male screw provided at the outer peripheral edge h22s of the screw hole h22, and the threaded portion of the male screw covered with a buffer spring is inserted through the screw hole h22 and screwed into the female screw provided in the screw hole h21, while the head of the male screw presses the bottom of the screw hole peripheral accommodation hole in the screwing direction of the male screw, and the buffer spring is contracted and accommodated inside the screw hole h22.

[0025] (Screw connection means with anti-loosening mechanism; end piece and rim or temple) The screw-loosening prevention eyeglasses according to the present invention are characterized in that one end of the end piece connected to the end piece of the rim is made up of an upper joint piece b having an insertion groove a at its inner end portion and a lower joint piece d having an insertion groove c continuous with the insertion groove a at its inner end portion, the end piece of the rim to which one end of the end piece is connected is made up of upper and lower end portions g and h, the upper and lower end portions g and h of the rim are inserted into the insertion grooves a and c of the upper joint piece b and the lower joint piece d, respectively, and are soldered, and the upper joint piece b and the lower joint piece d are separably integrated by a fixed type screw connection means having a loosening prevention mechanism, The fixed type screw connection means equipped with the loosening prevention mechanism has the upper joint piece b as the connecting part C1 and the lower joint piece d as the connected part C2, and inserts the threaded portion of a male screw covered with a shock absorbing spring through the threaded hole h1 of the connecting part C1 into the threaded holes h2, h1 provided in the connected part C2 and the connecting part C1, respectively, and screws the threaded portion of the male screw into the female screw provided in the threaded hole h2 of the connected part C2, while the head of the male screw presses the outer peripheral edge portion h1s of the threaded hole h1 of the connecting part C1 in the screwing direction of the male screw, thereby fixing the male screw. (3-2) Connection of external components

[0026] (Flip-up sunglasses) The screw-loosening prevention eyeglasses according to the present invention are eyeglasses that can be connected to flip-up sunglasses in which left and right rims for mounting sunglass lenses are connected at the center by the bridge to an upper connecting bridge that connects the left and right rims of the eyeglasses or the upper parts of the left and right rims, The connection part C1 provided on the left and right rims or bridge of the flip-up sunglasses and the connected part C2 provided on the left and right rims of the spectacles or the upper connecting bridge of the spectacles are rotatably connected by a hinge connection means equipped with the above-mentioned anti-loosening mechanism. (3-3) Replacement of connecting part C1 and connected part C2

[0027] In the screw loosening prevention eyeglasses according to the present invention, the connecting portion C1 may be replaced with the connected portion C2, and the connected portion C2 may be replaced with the connecting portion C1. Effect of the Invention

[0028] The screw-loosening prevention eyeglasses according to the present invention are made up of a number of components, such as a front frame consisting of a rim and a bridge, end pieces, and temples, and use a connection means for screwing a connecting part C1 provided on one component and a connected part C2 provided on the component connected to it by passing a male screw through screw holes h1 and h2 drilled in each component.The screw-tightening connection means is provided with a loosening prevention mechanism that covers the male screw with a buffer spring and then screws it, thereby preventing loosening between the male screw and the female screw.

[0029] (Screw-tightened connection means with anti-loosening mechanism) The screw fastening connection means equipped with a loosening prevention mechanism according to the present invention can be broadly classified into a rotation type that fixes the connecting part C1 and the connected part C2 to be rotatable, and a fixed type that fixes them non-rotatably. The former include rotation type hinge connection means and rotation type screw connection means equipped with a loosening prevention mechanism, and the latter include fixed type screw connection means equipped with a loosening prevention mechanism.

[0030] (Fixed screw connection means) In the latter fixed screw connection means equipped with a loosening prevention mechanism, the threaded portion of a male screw covered with a buffer spring is inserted through the threaded hole h1 of the connecting portion C1 into the threaded holes h2, h1 provided in the connected portion C2 and the connecting portion C1, respectively, and then threaded into the threaded hole h2 of the connected portion C2 and into the female screw provided in the threaded hole h2. When the male screw is fixed so that the head of the male screw presses the outer peripheral edge portion h1s of the threaded hole of the connecting portion C1, the buffer spring covering the male screw can be contracted and accommodated inside the threaded hole h1 of the connecting portion C1. The restoring forces of the contracted buffer spring act in opposite directions on the outer peripheral edge portion h2s of the threaded hole h2 provided in the connected portion C2 and on the head of the male screw, so that the male screw is pulled toward the connecting portion C1 into which it was inserted relative to the female screw. In this way, the threads of the male screw are always locked into the threads of the female screw, preventing minute relative movement in the minute gap that is provided in advance between the threads of the two. In other words, since there is no play between the male and female screw, it is possible to prevent the screw from loosening due to external forces such as vibration.

[0031] (Rotary screw connection means) In contrast, in the former rotating type screw connection means equipped with a loosening prevention mechanism, the buffer spring covering the male screw is not housed inside the screw hole h1 of the connection part C1, but is contracted and sandwiched between the outer edge h1s of the screw hole h1 of the inserted connection part C1 and the head of the male screw. Since the restoring forces of the buffer spring act on the outer edge h1s of the screw hole h1 and the head of the male screw in opposite directions, the male screw is also pulled toward the connection part C1 relative to the female screw. Therefore, while the rotating type screw connection means can prevent the screw from loosening due to an external force like the fixed type screw connection means, the force with which the head of the male screw presses the connection part C1 is mitigated by the buffer spring sandwiched between them, so that the connection part C1 is not completely fixed to the connected part C2, and the connection part C1 can rotate between the head of the male screw and the connected part C2.

[0032] (Rotating hinge connection means) Like the above-mentioned rotating screw connection means, the rotating hinge connection means equipped with the loosening prevention mechanism according to the present invention can also rotatably connect the connection part C1 of one of the blocks in the valley of the connected part C2 of the two blocks while preventing the screw from loosening. In this rotating hinge connection means, a male screw covered with a shock absorbing spring is inserted from the screw hole h22 of one of the two blocks, penetrates the screw hole h1 of the one block, and is screwed into the screw hole h21 of the other block, and is screwed into the erected female screw. At this time, the head of the male screw presses the outer peripheral edge part h22s of the abutting screw hole h22, fixing the male screw, and the one block of the connection part C1 is pressed against the contracted shock absorbing spring. However, because the buffer spring is sandwiched between the head of the male screw and one of the connecting pieces C1, it is not directly fixed to the other of the two pieces by the head of the male screw, but can freely rotate between the valleys of the two pieces of the connected piece C2. As with the fixed type screw connection means and the rotating type screw connection means, the restoring forces of the buffer spring acting in opposite directions on the outer circumferential edge h1s of the screw hole h1 of the connecting piece C1 and on the head of the male screw act to lock the threads of the male screw into the threads of the female screw, preventing the screw from loosening due to external forces such as vibration.

[0033] (Screw hole periphery accommodation hole) The screw-loosening prevention eyeglasses according to the present invention have a screw hole peripheral accommodation hole Ch provided on the outer peripheral edge h1s or h22s of the screw hole h1 or h22 into which the male screw is inserted, and the male screw covered with a buffer spring is screwed into the female screw while the head of the male screw is accommodated in the screw hole peripheral accommodation hole Ch. At this time, the head of the male screw presses the bottom of the screw hole peripheral accommodation hole Ch in the screwing direction of the male screw, and the buffer spring can be contracted and accommodated inside the screw hole h1. In addition, since the head of the male screw can be accommodated in the screw hole peripheral accommodation hole Ch, the appearance can be improved and loosening of the screw due to contact or friction can be prevented.

[0034] (T-shaped washer) When the abutting connected part C2 and connecting part C1 rotate relatively while receiving an external force in a direction in which they come into close contact, if both are made of a metal material such as titanium oxide, the rotation may be difficult. In the rotating hinge connection means or rotating screw connection means equipped with the loosening prevention mechanism according to the present invention, a T-shaped washer made of a material different from that of the connected part C2 and the connecting part C1 is disposed at the boundary between the connected part C2 and the connecting part C1, and the screwing part of the male screw is inserted into the hole of the T-shaped washer, thereby making the relative rotation smoother.

[0035] (Connection means with anti-loosening mechanism) As described above, in the screw-loosening prevention eyeglasses according to the present invention, if a hinge connection means or a rotating type screw connection means equipped with a loosening prevention mechanism is used for the connection between the temples and the end piece, the time until the so-called flapping state occurs can be significantly delayed, and the left and right temples can be opened and closed any number of times without worrying about the screws loosening. Also, if a fixed type screw connection means equipped with a loosening prevention mechanism is used for the connection between the upper and lower joint pieces of the end piece to close the gap provided in the rim, the eyeglasses can be used continuously and safely without worrying about the lenses falling off due to the screws loosening.

[0036] (Flip-up sunglasses) Such a connection means having an anti-loosening mechanism according to the present invention can also be used to connect eyeglasses to flip-up sunglasses, preventing the sunglasses from being unable to maintain a constant angle relative to the attached eyeglasses and from flapping about.

[0037] That is, a two-piece connected part C2 with a screw hole and a single-piece connecting part C1 with a screw hole are attached to an upper connecting bridge that connects the upper parts of the left and right rims of the eyeglasses and a flip-up sunglasses, respectively, and the connected part C2 and the connecting part C1 are connected by a connecting means equipped with the above-mentioned loosening prevention mechanism of the present invention. If a hinge connecting means or a rotating screw connecting means equipped with a loosening prevention mechanism is used between the connected part C2 and the connecting part C1, the flip-up sunglasses can be stably attached to the eyeglasses even if there is only one connection point where the connected part C2 and the connecting part C1 are provided. [Brief description of the drawings]

[0038] [Figure 1] 1 is a perspective view of a pair of eyeglasses for preventing screw loosening according to the present invention; [Diagram 2] 1A to 1C are plan views showing state transitions for opening and closing the temples of the screw-loosening prevention eyeglasses according to the present invention. [Diagram 3] 1A is an explanatory diagram of a screw-tightening connection means used in the screw-loosening prevention eyeglasses of the present invention, (a) a cross-sectional view of a hinge connection means 20H equipped with a loosening prevention mechanism, (b) an enlarged cross-sectional view thereof, and (c) a cross-sectional view of a hinge connection means 20H using a T-shaped washer. [Figure 4] FIG. 2 is an explanatory diagram of a hinge connection means 20H equipped with a loosening prevention mechanism according to the present invention, where (a) is a cross-sectional view of the hinge connection means 20H in which the head of the male screw presses against the peripheral portion of the insertion hole, and (b) is a cross-sectional view of the hinge connection means 20H in which the head of the male screw is accommodated in a peripheral accommodation hole of the screw hole. [Diagram 5] FIG. 1 is an explanatory diagram of a screw-tightening connection means used in the screw-loosening prevention eyeglasses of the present invention, (a) a cross-sectional view of a rotating type screw connection means 20Sr equipped with a loosening prevention mechanism, (b) an enlarged cross-sectional view thereof, and (c) a cross-sectional view of a rotating type screw connection means 20Sr using a T-shaped washer. [Figure 6] An explanatory diagram of a rotary type screw connection means 20Sr equipped with a loosening prevention mechanism according to the present invention, (a) a cross-sectional view of the rotary type screw connection means 20Sr in which a buffer screw presses against the peripheral portion of an insertion hole, and (b) a cross-sectional view of the rotary type screw connection means 20Sr in which the buffer screw is accommodated in a peripheral accommodation hole of a screw hole. [Figure 7] FIG. 1 is an explanatory diagram of a screw-tightening connection means used in the screw-loosening prevention eyeglasses of the present invention, (a) a cross-sectional view of a fixed screw connection means 20Sf equipped with a loosening prevention mechanism, (b) an enlarged cross-sectional view thereof, and (c) a cross-sectional view of a fixed screw connection means 20Sf using a T-shaped washer. [Figure 8] 1A is an explanatory diagram of a fixed screw connection means 20Sf equipped with a loosening prevention mechanism according to the present invention; (a) is a cross-sectional view of the fixed screw connection means 20Sf in which a buffer screw is accommodated in an insertion hole; (b) is a cross-sectional view of the fixed screw connection means 20Sf in which the head of the male screw is accommodated in a screw hole peripheral accommodation hole. [Figure 9] An explanatory diagram of a rotary type screw connection means 20Sr in which a buffer screw of the present invention presses against the peripheral portion of an insertion hole, (a) is a cross-sectional view of the rotary type screw connection means 20Sr in which a buffer screw presses against the peripheral portion of an insertion hole, and (b) is an enlarged cross-sectional view thereof. [Figure 10] 1 is a front view of the screw-loosening prevention eyeglasses according to the present invention, in which flip-up sunglasses are connected by providing pairs of a connecting part C1 and a connected part C2 in two places. FIG. [Figure 11] 1 is a front view of the screw-loosening prevention eyeglasses of the present invention, in which flip-up sunglasses are connected by a set of a connecting part C1 and a connected part C2 provided in one place. [Figure 12] Schematic diagrams showing examples of conventional connection means, including (a) a schematic cross-sectional view of a hinge connection means, (b) a schematic cross-sectional view of a screw connection means, (c) a schematic cross-sectional view of a magnet connection means, and (d) a schematic cross-sectional view of an insertion connection means. [Figure 13] FIG. 2(a) is a perspective view of conventional eyeglasses, and FIG. 2(b) is an enlarged schematic cross-sectional view showing the screw connection between the rim and the end piece. [Figure 14] FIG. 13 is a schematic perspective view showing a screw connection between the rims and temples and the end piece in conventional eyeglasses. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0039] Hereinafter, an embodiment of the screw loosening prevention eyeglasses according to the present invention will be described with reference to the drawings. Note that the same reference numerals are used for the same components throughout the drawings. (1) Anti-loosening eyeglasses equipped with a mechanism to prevent loosening

[0040] (Anti-loosening glasses) 1 and 2, the screw loosening prevention eyeglasses 1 according to the present invention are made up of a number of components, including a front frame 12 consisting of left and right rims (12L, 12R) on which lenses are attached and a bridge 12B connecting them in the center, left and right end pieces 16 (16L, 16R), and left and right temples 14 (14L, 14R) connected to the rear of the front frame 12. The left and right end pieces 16 (16L, 16R) have one end and the other end, with the one end connected to the end of the left and right rims (12L, 12R) and the other end connected to the front end of the left and right temples 14 (14L, 14R).

[0041] Left and right end pieces 18 (18L, 18R) may be provided at the rear ends of the left and right temples 14 (14L, 14R), and usually, left and right nose pads are attached to the left and right rims (12L, 12R) via left and right foot pieces.

[0042] In the screw-loosening prevention eyeglasses 1 according to the present invention, the above-mentioned components may be connected by a conventional connection means 120 as shown in Fig. 12, but at least one pair of a connecting part C1 and a connected part C2 uses a screw-tightening connection means 20 (20H, 20S) equipped with a loosening prevention mechanism (see Fig. 2). That is, in the screw-loosening prevention eyeglasses 1 according to the present invention, a male screw 40 consisting of a head 40H and a screw-in part 40I is inserted through screw holes h1 and h2 respectively drilled in the connecting part C1 and the connected part C2 to connect the connecting part C1 provided on at least one component and the connected part C2 provided on the component to be connected thereto, and at this time, the screw-tightening connection means 20 equipped with a loosening prevention mechanism is used (see Figs. 3, 5, and 7).

[0043] The screw-tightening connection means 20 with the above-mentioned loosening prevention mechanism is basically a loosening prevention mechanism in which a shock absorbing spring 42 is covered on the male screw 40 and screwed in, and thus the screw-loosening prevention eyeglasses 1 according to the present invention can prevent the screw from loosening at that portion. The screw-tightening connection means 20 with the loosening prevention mechanism can be classified into a connection means with a rotating type loosening prevention mechanism and a connection means with a fixed type loosening prevention mechanism, which will be described below. The former includes a hinge connection means 20H with a loosening prevention mechanism (see Figs. 3 and 4) and a rotating type screw connection means 20Sr with a loosening prevention mechanism (see Figs. 5 and 6), and the latter includes a fixed type screw connection means 20Sf with a loosening prevention mechanism (see Figs. 7 and 8). (2) Connection means equipped with a mechanism for preventing loosening

[0044] As described above, in the screw loosening prevention eyeglasses 1 according to the present invention, the connection means 20 equipped with a rotating type loosening prevention mechanism includes the hinge connection means 20H equipped with a loosening prevention mechanism and the rotating type screw connection means 20Sr equipped with a loosening prevention mechanism. Also, the connection means 20 equipped with a fixed type loosening prevention mechanism includes the fixed type screw connection means 20Sf equipped with a loosening prevention mechanism. (2-1) Connection means equipped with a rotating type anti-loosening mechanism (2-1A) Hinge connection means equipped with anti-loosening mechanism

[0045] (Hinge connection means with anti-loosening mechanism) In the screw-loosening prevention eyeglasses 1 according to the present invention, the screw-tightening connection means 20 equipped with a loosening prevention mechanism is a hinge connection means 20H that fits one piece of the connecting part C1 into the valley between two pieces of the connected part C2 and fixes the one piece so that it can rotate between the valleys of the two pieces, as shown in Figures 3(a) to (c). This hinge connection means 20H is equipped with a loosening prevention mechanism by adding a shock absorbing spring 42 to the conventional hinge connection means 120H (see Figure 12(a)).

[0046] In this hinge connection means 20H, one piece (connecting part C1) with a screw hole h1 is inserted between two pieces (connected part C2) with screw holes h21 and h22, and the screw-in part 40I of the male screw covered with the shock absorbing spring 42 is inserted from the screw hole h22 of one of the two pieces and penetrates the screw hole h1 of the one piece. Then, as shown in Fig. 4(a), the screw-in part 40I of the male screw is screwed into the female screw 41 erected in the screw hole h21 of the other of the two pieces, and the head 40H of the male screw presses the outer peripheral edge part h22s of the screw hole h22 that it abuts against in the screw-in direction of the male screw 40 to fix it.

[0047] At this time, in the hinge connection means 20H equipped with a loosening prevention mechanism, the buffer spring 42 covering the threaded portion 40I of the male screw is contracted and accommodated inside one of the screw holes h22 of the two screws of the connected part C2, and the restoring force of the contracted buffer spring 42 acts in opposite directions on the outer circumferential edge portion h1s of the screw hole h1 of the connecting part C1 and on the head 40H of the male screw (see Fig. 4(a) and Fig. 3(b)). However, although the single screw of the connecting part C1 is pressed in the direction of the outer circumferential edge portion h21s of the screw hole h21 by the restoring force of the buffer spring 42, it is not completely fixed to the connected part C2 and can rotate in the valley between the two screws of the connected part C2.

[0048] The hinge connection means 20H having a loosening prevention mechanism may have a screw hole peripheral accommodation hole Ch capable of accommodating the head 40H of a male screw at the outer peripheral edge h22s of the screw hole h22 as shown in Fig. 4(b). In this case, when the screw-in portion 40I of the male screw covered with the buffer spring 42 is inserted from the screw hole h22, the screw-in portion 40I is screwed into the female screw 41 erected in the screw hole h21, and the head 40H of the male screw presses the bottom of the screw hole peripheral accommodation hole Ch in the screw-in direction of the male screw 40. The buffer spring 42 is contracted and accommodated inside the screw hole h22, and its restoring force acts in the opposite directions on the outer peripheral edge h1s of the screw hole h1 of the connection part C1 and the head 40H of the male screw (see Figs. 4(b) and 3(b)). As in FIG. 4(a), the single block of the connecting portion C1 in FIG. 4(b) can rotate in the valley between the two blocks of the connected portion C2.

[0049] As shown in FIG. 3(c), a T-shaped washer 43 may be sandwiched between the two pieces of the connected part C2 and the one piece of the connecting part C1. When the connecting part C1 and the connected part C2 are both made of metal such as titanium oxide, the connecting part C1 is difficult to rotate. However, by using a T-shaped washer 43 made of a material different from that of the connected part C2 and the connecting part C1, the connecting part C1 can be rotated smoothly. That is, by inserting a T-shaped washer 43 made of an appropriate material, the friction coefficient between the T-shaped washer 43 and the connected part C2 and the connecting part C1 can be appropriately adjusted, and the connecting part C1 can be rotated smoothly. In addition, the range (angle) in which the connecting part C1 can rotate relative to the connected part C2 can be limited by a known restricting means. (2-1B) Rotating type screw connection means 20Sr equipped with a loosening prevention mechanism

[0050] (Rotary screw connection means 20Sr equipped with anti-loosening mechanism) In the screw-loosening prevention eyeglasses 1 according to the present invention, the screw-tightening connection means 20 equipped with a loosening prevention mechanism is a rotation type screw connection means 20Sr that fixes the connected part C2 and the connecting part C1 so that they can rotate relatively, as shown in Fig. 5(a) to (c). This rotation type screw connection means 20Sr is equipped with a loosening prevention mechanism by adding a shock absorbing spring 42 to the conventional screw connection means 120S (see Fig. 12(b)).

[0051] In the rotation type screw connection means 20Sr equipped with the loosening prevention mechanism according to the present invention, the male screw threaded portion 40I covered with the buffer spring 42 is inserted from the threaded hole h1 of the connection portion C1 into the threaded holes h2, h1 provided in the connected portion C2 and the connection portion C1, respectively, and the male screw threaded portion 40I is screwed into the female screw 41 provided in the threaded hole h2 of the connected portion C2. At this time, the buffer spring 42 covering the male screw threaded portion 40I is sandwiched between the outer peripheral edge portion h1s of the threaded hole h1 of the connection portion C1 and the head portion 40H of the male screw, as shown in Fig. 5(b) or 6(a). In this type of pivotable screw connection means 20Sr, like the above-mentioned hinge connection means 20H, the restoring force of the contracted buffer spring 42 acts in opposite directions on the outer peripheral edge portion h1s of the screw hole h1 of the connection part C1 and on the head portion 40H of the male screw, thereby fixing the connection part C1 so that it can pivot relative to the connected part C2.

[0052] Also, a screw hole peripheral accommodation hole Ch capable of accommodating the buffer spring 42 covering the screw-in portion 40I of the male screw may be provided on the outer peripheral edge portion h1s of the screw hole h1. In such a rotation type screw connection means 20Sr, the screw-in portion 40I of the male screw covered with the buffer spring 42 is inserted from the screw hole h1 and screwed into the female screw 41 erected in the screw hole h2, and as shown in FIG. 6(b), the head 40H of the male screw presses the outer peripheral edge portion h1s of the screw hole h1 in the screw-in direction of the male screw 40, and the buffer spring 42 is contracted and accommodated in the screw hole peripheral accommodation hole Ch. In this way, even if the screw hole peripheral accommodation hole Ch is provided on the outer peripheral edge portion h1s of the screw hole h1 and the buffer spring 42 is accommodated, the connecting portion C1 can be fixed to be rotatable with respect to the connected portion C2, and the appearance can be improved and the loosening of the screw due to contact or friction can be prevented.

[0053] (T-shaped washer) As in the case of the hinge connection means 20H, the present rotation type screw connection means 20Sr may have a T-shaped washer 43 disposed at the boundary between the connected part C2 and the connecting part C1, and the male screw threading part 40I may be inserted into the hole of the T-shaped washer 43, as shown in FIG. 5(c). As described above, when the connecting part C1 and the connected part C2 are both made of the same metal, inserting the T-shaped washer 43 made of a different material between them can appropriately adjust the friction coefficient between the T-shaped washer 43 and the connected part C2 and the connecting part C1, thereby making it possible to smoothly rotate the connecting part C1. For example, when the connecting part C1 and the connected part C2 are both made of a metal such as titanium oxide, it is preferable to insert the T-shaped washer 43 made of nickel silver (an alloy of copper, zinc, and nickel). The range (angle) in which the connecting part C1 can rotate relative to the connected part C2 can be limited by a known restricting means. (2-2) Connection means equipped with a fixed anti-loosening mechanism

[0054] (Fixed screw connection means 20Sf with anti-loosening mechanism) In the screw-loosening prevention eyeglasses 1 according to the present invention, the screw-tightening connection means 20 equipped with a loosening prevention mechanism is a fixed screw connection means 20Sf as shown in Fig. 7(a)-(c). Like the above-mentioned rotating type screw connection means 20Sr, this fixed screw connection means 20Sf is equipped with a loosening prevention mechanism by adding a buffer spring 42 to the conventional screw connection means 120S (see Fig. 12(b)), but differs from the rotating type screw connection means 20Sr in that the connected part C2 and the connecting part C1 do not rotate relative to each other. In this fixed screw connection means 20Sf, the restoring force of the contracted buffer spring 42 acts on the connected part C2, not the connecting part C1, so that the connecting part C1 is fixed to the connected part C2, and the two do not rotate relative to each other.

[0055] In the fixed type screw connection means 20Sf of the present invention, similarly to the above-mentioned pivot type screw connection means 20Sr, the threaded portion 40I of the male screw covered with the shock absorbing spring 42 is inserted from the threaded hole h1 of the connecting portion C1 into the threaded holes h2, h1 provided in the connected portion C2 and the connecting portion C1, respectively, and the threaded portion 40I of the male screw is screwed into the female screw 41 provided in the threaded hole h2 of the connected portion C2. However, unlike the pivot type screw connection means 20Sr (see Figs. 5(b) and 6(a)), the head portion 40H of the male screw presses the outer peripheral edge portion h1s of the threaded hole h1 of the connecting portion C1, as shown in Fig. 7(b) or 8(a).

[0056] In the fixed type screw connection means 20Sf, the buffer spring 42 is contracted and accommodated inside the screw hole h1, and the restoring force of the contracted buffer spring 42 acts in opposite directions on the outer edge h2s of the screw hole h2 provided in the connected part C2 and on the head 40H of the male screw. The head 40H of the male screw presses the outer edge h1s of the screw hole h1 of the connecting part C1, and the connecting part C1 is sandwiched and fixed between the head 40H of the male screw and the connected part C2 (see Fig. 7(b) and Fig. 8(a)), so that the connected part C2 and the connecting part C1 do not rotate relative to each other, but the male screw 40 is screwed into the female screw 41 via the buffer spring 42 and does not loosen.

[0057] 8(b), the fixed screw connection means 20Sf according to the present invention may be provided with a screw hole peripheral accommodation hole Ch capable of accommodating the head 40H of the male screw at the outer peripheral edge h1s of the screw hole h1. When the screw-in portion 40I of the male screw covered with the buffer spring 42 is inserted from the screw hole h1 and screwed into the female screw 41 erected in the screw hole h2, the head 40H of the male screw presses the bottom of the screw hole peripheral accommodation hole Ch in the screw-in direction of the male screw 40, and the buffer spring 42 is contracted and accommodated inside the screw hole h1. Even when the screw hole peripheral accommodation hole Ch is provided in this way, the connected part C2 and the connecting part C1 to be connected do not rotate relative to each other, but the male screw 40 is screwed into the female screw 41 via the buffer spring 42 and does not loosen. (2-3) Principle of the relaxation prevention mechanism

[0058] The connection means 20 equipped with a rotating type loosening prevention mechanism (hinge connection means 20H equipped with a loosening prevention mechanism, rotating type screw connection means 20Sr equipped with a loosening prevention mechanism) and the connection means 20 equipped with a fixed type loosening prevention mechanism (fixed type screw connection means 20Sf equipped with a loosening prevention mechanism) in the screw loosening prevention eyeglasses 1 according to the present invention have been described above, but the principle of the loosening prevention mechanism that prevents screws from loosening can be explained with reference to Fig. 9. Below, the principle of the loosening prevention mechanism according to the present invention will be explained with reference to Figs. 9(a) and (b) using the rotating type screw connection means 20Sr equipped with a loosening prevention mechanism according to the present invention as an example.

[0059] In the conventional screw connection means 120S shown in Fig. 12(b), since the buffer spring 42 is not used, unlike the pivot type screw connection means 20Sr of the present invention shown in Fig. 9(a), no force acts on the threaded portion 40I of the male screw in the direction of the connecting portion C1 from the connected portion C2. This force acting on the threaded portion 40I of the male screw in the direction of the connecting portion C1 occurs because, in the pivot type screw connection means 20Sr of the present invention, the buffer spring 42 contracted between the outer peripheral edge portion h1s of the screw hole h1 of the connecting portion C1 and the head portion 40H of the male screw acts its restoring force in the opposite direction to the outer peripheral edge portion h1s and the head portion 40H of the male screw.

[0060] Therefore, in the screw connection means 120S in which the shock absorbing spring 42 does not cover the screw-in portion 40I of the male screw, generally, there is a play between the threads of the screw-in portion 40I of the male screw and the threads of the female screw 41, so that even slight vibrations cause the threads of both to move relative to each other, causing the screw to loosen. However, in the rotating type screw connection means 20Sr of the present invention, the threads of the male screw 40 are pulled toward the connection portion C1 by the restoring force of the shock absorbing spring 42 and are constantly engaged with the threads of the female screw 41 as shown in Fig. 9(b), so that the relative movement between the threads is suppressed and the screw is less likely to loosen. (3) Examples

[0061] The above describes the connection means 20 equipped with the rotating and fixed type anti-loosening mechanisms used in the screw-loosening prevention eyeglasses 1 according to the present invention. The rotating type includes the hinge connection means 20H equipped with a loosening prevention mechanism and the rotating type screw connection means 20Sr equipped with a loosening prevention mechanism, while the fixed type includes the fixed type screw connection means 20Sf equipped with a loosening prevention mechanism.

[0062] In the following, specific examples will be described of between what components (connected part C2 and connecting part C1) the connecting means 20 having these loosening prevention mechanisms is used in the screw loosening prevention eyeglasses 1 according to the present invention. (3-1) Examples of the screw loosening prevention glasses 1 according to the present invention

[0063] The connection means 20 equipped with the anti-loosening mechanism of the present invention can be used between components (connected part C2 and connecting part C1) such as the rims (12L, 12R), end pieces 16 (16L, 16R), and temples 14 (14L, 14R) of the screw-loosening prevention eyeglasses 1 of the present invention. EXAMPLES

[0064] (Hinge connection means with anti-loosening mechanism; end piece and temple) As shown in Figures 1 and 2, the screw loosening prevention eyeglasses 1 of this embodiment can rotatably connect the connected part C2 provided at the other end of the end piece 16 and the connecting part C1 provided at the front end of the temple 14 by a hinge connection means 20H equipped with a loosening prevention mechanism.

[0065] As described above, the hinge connection means 20H equipped with this loosening prevention mechanism fits one of the connecting parts C1 into the valley between the two pieces of the connected parts C2, and fixes the one piece so that it can rotate between the valley between the two pieces (see Figs. 3 and 4). A single piece (connecting part C1) with a screw hole h1 is inserted into the valley between the two pieces (connected part C2) with screw holes h21 and h22 on each piece, and a male screw threading part 40I covering a buffer spring 42 is inserted from the screw hole h22 of one of the two pieces and penetrates the screw hole h1 of the single piece. Then, the male screw threading part 40I is screwed into the screw hole h21 of the other of the two pieces, and is screwed into the female screw 41 erected in the screw hole h21.

[0066] At this time, the head 40H of the male screw presses the outer peripheral edge h22s of the screw hole h22 of the connected part C2 against which it abuts, in the screwing direction of the male screw 40, and the buffer spring 42 in its contracted state is sandwiched between the head 40H of the male screw and the outer peripheral edge h1s of the screw hole h1 of the connecting part C1. The restoring force of the buffer spring 42 acts in the opposite direction on the head 40H of the male screw and the outer peripheral edge h1s of the connecting part C1, pressing the connecting part C1 towards the screw hole h21 of the connected part C2, but this single block of the connecting part C1 can be rotated in the gap between the two blocks of the connected part C2. In addition, the restoring force of such a buffer spring 42 generates a force in the screw-in portion 40I of the male screw in the direction of the screw hole h22 of the connected part C2, as shown in Figure 4 (a), so that the threads of the male screw 40 and the female screw 41 engage with each other, preventing the screws from loosening.

[0067] Alternatively, as shown in Fig. 4(b), a screw hole peripheral accommodation hole Ch capable of accommodating the head 40H of a male screw may be provided on the outer peripheral edge h22s of the screw hole h22, and the threaded portion 40I of the male screw covered with the buffer spring 42 may be inserted through the screw hole h22. In this case as well, the threaded portion 40I of the male screw screws into the female screw 41 provided in the screw hole h21, but the head 40H of the male screw presses the bottom of the screw hole peripheral accommodation hole Ch in the screwing direction of the male screw 40. The buffer spring 42 is contracted and accommodated inside the screw hole h22, and exerts a restoring force in the opposite direction on the head 40H of the male screw engaged in the screw hole peripheral accommodation hole Ch and the outer peripheral edge h1s of the connection part C1.

[0068] In this way, by providing the screw hole peripheral accommodation hole Ch on the outer peripheral edge portion h22s of the screw hole h22, the head 40H of the male screw can be accommodated, improving the appearance of the screw loosening prevention eyeglasses 1 according to the present invention. In addition, since the head 40H of the male screw does not protrude from the screw hole, contact with the outside is suppressed, and loosening of the screw due to external force or friction can be prevented.

[0069] As described above, the hinge connection means 20H equipped with the loosening prevention mechanism of this embodiment is used between the other end (connected part C2) of the end piece 16 and the front end part (connecting part C1) of the temple 14, and can rotatably connect the temple 14 to the front frame 12, which has the end piece 16 connected to it, while preventing the screw from loosening. EXAMPLES

[0070] In this embodiment, a hinge connection means 20H equipped with the loosening prevention mechanism of the present invention and a conventional hinge connection means 20H were used for connecting the left and right temples and endpieces of normal eyeglasses, respectively, and a test for "temple repeated opening and closing durability" was conducted as follows to compare the two hinge connection means 20H. The hinge connection means 20H equipped with the loosening prevention mechanism of the present invention was used for connecting the left temple, and the conventional hinge connection means 20H was used for connecting the right temple.

[0071] (Testing organization) Japan Optical Inspection Association (JSOI) 5th floor, Glasses Hall, 2-3-4 Shinyokoe, Sabae City, Fukui Prefecture (Exam date and time) April 17, 2024 (Test method) "Temple repeated opening and closing durability"; (1) The sample is the "left temple" (hinge connection means 20H having the anti-loosening mechanism of the present invention in its connection) or the "right temple" (conventional hinge connection means 20H), and the "folding load value" of the sample is measured using a "folding load value test device" (a test machine developed by JSOI) and recorded. (2) A sample is attached to the "Glasses Temple Repeated Opening and Closing Test Machine" (a test machine developed by JSOI), and the "left temple hinge part" or "right temple hinge part" to be tested is set from the "temple closed position" to the "normal open angle (90 degrees) position," which is counted as one time, and a repeat opening and closing test is carried out. (3) After the sample attached in (2) is tested "1,000 times in a row," the "load value" is measured in the same manner as in (1), and at the same time, the "presence or absence of abnormalities in the hinge opening and closing function" is "visually confirmed" and recorded. (4) If no "abnormalities such as fluttering" are found in "(3)", the test is further conducted "1,000 consecutive times" and the "load value" is measured in the same manner as in "(1)". At the same time, the "presence or absence of abnormalities in the opening and closing function of the hinge" is "visually confirmed" and recorded. This test is repeated until a "total of 5,000 times" is reached.

[0072] (Test Results) [Table 1]

[0073] As a result of the test, the "load value" of the "left temple hinge part" was "0.74N" as the "initial value before the test", but was measured as "0.85N" after "1000 times", "0.75N" after "2000 times", "0.72N" after "3000 times", "0.73N" after "4000 times", and "0.73N" after "5000 times". Although there was an "extremely slight change in the folding load value", it was inferred that in the range of the sample's "left temple" after "5000 times", the test result was "approximately 99%" compared to the "initial value", meaning that "there was almost no change in the load value."

[0074] In addition, the "load value" of the "right temple hinge part" was "0.49N" as the "initial value before the test", but was measured as "0.32N" after "1000 times", "0.28N" after "2000 times", "0.24N" after "3000 times", "0.27N" after "4000 times", and "0.22N" after "5000 times". From the test result after "5000 times", it was inferred that the "change in folding load value" in the "right temple" area of ​​the sample was "about 45%" compared to the "initial value", meaning that "the change in load value has become slower."

[0075] From the above test results, it has been demonstrated that by providing the screw-tightened hinge connection means 20H with the loosening prevention mechanism of the present invention, in which the male screw is covered with a buffer spring and then screwed, loosening between the male screw and the female screw can be prevented. EXAMPLES

[0076] (Fixed screw connection means 20Sf with anti-loosening mechanism; end piece and rim) In the screw loosening prevention eyeglasses 1 according to this embodiment, one end of the end piece 16 (16L, 16R) connected to the end of the rim (12L, 12R) consists of an upper joint piece b having a fitting groove a at its inner end portion, and a lower joint piece d having a fitting groove c continuous with the fitting groove a at its inner end portion, as shown in FIG. 13(b) above, and the end of the rim 12L to which one end of the end piece 16L is connected consists of upper and lower end portions g, h.

[0077] In the screw-loosening prevention eyeglasses 1 according to this embodiment, the upper and lower end portions g and h of the rim are fitted and soldered into the fitting grooves a and c of the upper joint piece b and the lower joint piece d, respectively, and the upper joint piece b and the lower joint piece d are fixed so as not to rotate by the fixed screw connection means 20Sf equipped with a loosening prevention mechanism. The operation of this fixed screw connection means 20Sf equipped with a loosening prevention mechanism is as described above.

[0078] That is, with the lower joint piece d as the connecting part C1 and the upper joint piece b as the connected part C2, the threaded part 40I of the male screw covered with the buffer spring 42 is inserted from the threaded hole h1 of the connecting part C1 into the threaded holes h2, h1 provided in the connected part C2 and the connecting part C1, respectively, and the threaded part 40I of the male screw is screwed into the female screw 41 provided in the threaded hole h2 of the connected part C2. The male screw 40 is fixed so that its head 40H presses against the bottom of the screw hole peripheral receiving hole Ch provided in the lower joint piece d (connecting part C1), but the restoring force of the buffer spring 42 (not shown) engages the threads of the male screw 40 and the female screw 41, preventing the screw from loosening. (3-2) External Components

[0079] The connection means having the loosening prevention mechanism according to the present invention can also be used between components of the screw loosening prevention eyeglasses 1 according to the present invention and parts that are attached externally to the screw loosening prevention eyeglasses 1. Furthermore, the connection means having the loosening prevention mechanism according to the present invention can also be used for parts that are attached externally to the screw loosening prevention eyeglasses 1 according to the present invention, making it possible to prevent loosening of the screws connecting the components of the external parts. EXAMPLES

[0080] (Flip-up sunglasses) The screw loosening prevention eyeglasses 1 according to this embodiment are eyeglasses in which a flip-up sunglasses 60 can be connected to an upper connecting bridge 12A that connects the left and right rims (12L, 12R) of the eyeglasses or the upper parts of the left and right rims (12L, 12R), as shown in Fig. 11. In the flip-up sunglasses 60 of this embodiment, the left and right rims (12L, 12R) on which the sunglasses lenses are attached are connected at their centers by the upper connecting bridge.

[0081] In the screw loosening prevention eyeglasses 1 of this embodiment, the connection part C1 provided on the upper connecting bridge of the flip-up sunglasses 60 and the connected part C2 provided on the upper connecting bridge 12A of the screw loosening prevention eyeglasses 1 are rotatably connected by a hinge connection means 20H equipped with a loosening prevention mechanism. The operation of the hinge connection means 20H equipped with a loosening prevention mechanism is as described above, and the flip-up sunglasses 60 (connection part C1) can be rotated relative to the screw loosening prevention eyeglasses 1 (connection part C2) while preventing loosening of the screw between the connection part C1 of the flip-up sunglasses 60 and the connected part C2 of the screw loosening prevention eyeglasses 1.

[0082] The screw loosening prevention eyeglasses 1 of this embodiment to which such flip-up sunglasses 60 are connected can prevent the sunglasses 60 from becoming so-called flapping even with only one connection part, and can keep the angle of the flip-up sunglasses 60 constant relative to the front frame 12 of the eyeglasses 1. The connection part C1 of the flip-up sunglasses 60 is pressed toward the female screw 41 by the restoring force of the buffer spring 42 sandwiched between the connection part C1 and the head 40H of the male screw 40 screwed into the female screw 41 of the connected part C2, but the male screw 40 is pulled in the opposite direction, so that a certain degree of stiffness is generated in the rotation of the flip-up sunglasses 60 (connection part C1) relative to the screw loosening prevention eyeglasses 1 (connected part C2) (see Figs. 4(a) and (b)).

[0083] 10, the left and right rims or upper connecting bridges and the left and right rims (12L, 12R) or upper connecting bridges 12A of the screw loosening prevention glasses 1 may each be provided with a connecting part C1 and a connected part C2 at two locations, and rotatably connected by a hinge connecting means 20H equipped with a loosening prevention mechanism. In this case, too, the flip-up sunglasses 60 (connecting part C1) can be rotated relative to the screw loosening prevention glasses 1 (connecting part C2) while further preventing loosening of the screw between the connecting part C1 of the flip-up sunglasses 60 and the connected part C2 of the screw loosening prevention glasses 1.

[0084] Although the screw loosening prevention glasses according to the present invention have been described above using examples, the form of the screw loosening prevention glasses is not limited to the above-mentioned embodiment and examples. The shapes and materials of the elements constituting the screw loosening prevention glasses according to the present invention are not particularly limited. In the screw loosening prevention glasses according to the present invention, the connecting portion C1 may be replaced with the connected portion C2, and the connected portion C2 may be replaced with the connecting portion C1.

[0085] In addition, the present invention can be implemented in various forms with various improvements, modifications, and changes based on the knowledge of those skilled in the art without departing from the spirit of the present invention. [Industrial Applicability]

[0086] The screw loosening prevention eyeglasses according to the present invention can be used for eyeglasses that use screw fastening. [Explanation of symbols]

[0087] 1: Anti-loosening glasses according to the present invention C1: Connection part h1: Screw hole of connection part C1 h1s: Outer edge of screw hole h1 C2: Connected part h2: Screw hole of connected part C2 h2s: Outer edge of screw hole h2 Ch: Screw hole periphery accommodation hole 10: Glasses 12: Front frame 12(12L, 12R): (left and right) rims 12A: Upper connecting bridge 12B: Bridge 14 (14L, 14R): (Left and right) temples 16 (16L, 16R): (left and right) armor 18 (18L, 18R): (Left and right) Modern 20: Screw-tightened connection means with anti-loosening mechanism (connection means with anti-loosening mechanism) 20H: Hinge connection means 20Sr: Rotating screw connection means 20Sf: Fixed screw connection means 40: Male thread 41: Female thread (nut) 42: Shock spring 43: T-shaped washer 60: Flip-up sunglasses 110: (conventional) glasses 112: Front frame 112L, 112R: (left and right) rims 112A: Upper connecting bridge 112B: Bridge 114L, 114R: (left and right) temples 116L, 116R: (left and right) (left and right) armor 118L, 118R: (left and right) modern 120: Connection method 120H: Hinge connection means 120S: Screw connection means 120M:Magnetic connection means 120I: Insertion connection means

Claims

1. A front frame consisting of left and right rims on which lenses are attached and a bridge connecting them in the center; Left and right end pieces each having one end and the other end, the one end of each end being connected to the end portion of the left and right rims; and left and right temples whose front ends are connected to the other ends of the left and right end pieces and connected to the rear of the front frame. In a pair of eyeglasses using a connection means in which a connecting part C1 provided on one component and a connected part C2 provided on a component to be connected thereto are screwed together by passing a male screw having a head and a screw-in part through screw holes h1 and h2 respectively drilled in the connecting part C1 and the connected part C2, The screw fastening means is The screw-loosening prevention eyeglasses are provided with a screw-tightening mechanism (hereinafter also referred to as the "loosening prevention mechanism") that covers a male screw with a buffer spring and tightens the screw, thereby preventing the screw from loosening.

2. The screw-tightening connection means having the loosening prevention mechanism (hereinafter also referred to as "screw-tightening connection means having a loosening prevention mechanism") is In a hinge connection means for fitting one piece of a connecting part C1 into a valley between two pieces of a connected part C2, the one piece is fixed so as to be rotatable between the valleys of the two pieces, The one piece having the screw hole h1 is inserted between the valleys of the two pieces having the screw holes h21 and h22, The threaded portion of the male screw covered with the buffer spring is inserted from the screw hole h22 of one of the two pieces, penetrates the screw hole h1 of the first piece, and is screwed into the female screw provided in the screw hole h21 of the other piece. The head of the male screw presses the outer peripheral edge portion h22s of the screw hole h22 in the screwing direction of the male screw, A hinge connection means having a loosening prevention mechanism that fixes the one piece of the connecting portion C1 so as to be rotatable between the valleys of the two pieces of the connected portion C2, The screw-loosening prevention eyeglasses of claim 1, characterized in that a buffer spring covering the threaded portion of the male screw is contracted and accommodated inside the screw hole h22 of one of the two screws of the connected portion C2, and the restoring force of the contracted buffer spring acts in opposite directions on the outer peripheral edge h1s of the screw hole h1 of the connecting portion C1 and on the head of the male screw.

3. A screw hole peripheral accommodation hole capable of accommodating the head of the male screw is provided on the outer peripheral edge portion h22s of the screw hole h22, The screw-in portion of the male screw covered with the buffer spring is inserted through the screw hole h22 and screwed into the female screw provided in the screw hole h21. The head of the male screw presses the bottom of the screw hole peripheral receiving hole in the screw-in direction of the male screw, The buffer spring is contracted and accommodated inside the screw hole h22. The screw loosening prevention eyeglasses according to claim 2.

4. The screw fastening connection means having the loosening prevention mechanism is The male screw covered with the shock absorbing spring is inserted into the screw hole h1 of the connecting portion C1 through the screw hole h2 and h1 provided in the connected portion C2 and the connecting portion C1, respectively. The threaded portion of the male screw is screwed into the female screw provided in the screw hole h2 of the connected portion C2, and a buffer spring covering the threaded portion of the male screw is sandwiched between the outer peripheral edge portion h1s of the screw hole h1 of the connecting portion C1 and the head of the male screw, A rotation type screw connection means having an anti-loosening mechanism that fixes a connecting part C1 to a connected part C2 so as to be rotatable, 2. The eyeglasses according to claim 1, wherein the restoring force of the contracted buffer spring acts in opposite directions on the outer circumferential edge h1s of the screw hole h1 of the connection portion C1 and on the head of the male screw.

5. A screw hole peripheral accommodation hole capable of accommodating a buffer spring covering the screw-in portion of the male screw is provided on an outer peripheral edge portion h1s of the screw hole h1; The threaded portion of the male screw covered with the buffer spring is inserted through the screw hole h1 and screwed into the female screw provided in the screw hole h2. The head of the male screw presses the outer peripheral edge portion h1s of the screw hole h1 in the screwing direction of the male screw, The shock absorbing spring is contracted and accommodated in the peripheral accommodation hole of the screw hole. The screw loosening prevention eyeglasses according to claim 4.

6. 4. The screw-loosening prevention eyeglasses according to claim 2 or claim 3, wherein a T-shaped washer made of a material different from that of the connected portion C2 and the connecting portion C1 is placed at the boundary between the connected portion C2 and the connecting portion C1, and the threaded portion of the male screw is inserted into a hole in the T-shaped washer.

7. The screw fastening connection means having the loosening prevention mechanism is The male screw covered with the shock absorbing spring is inserted into the screw hole h1 of the connecting portion C1 through the screw hole h2 and h1 provided in the connected portion C2 and the connecting portion C1, respectively. a fixed type screw connection means having a loosening prevention mechanism, in which a screw-in portion of the male screw is screwed into a female screw provided in a screw hole h2 of the connected portion C2, and a head portion of the male screw presses an outer peripheral edge portion h1s of the screw hole h1 of the connecting portion C1 in a screw-in direction of the male screw, thereby fixing the male screw, The shock absorbing spring that covers the screw-in portion of the male screw is contracted and accommodated inside the screw hole h1, The eyeglasses having screw loosening prevention mechanism according to claim 1, characterized in that the restoring force of the contracted buffer spring acts in opposite directions on the outer edge h2s of the screw hole h2 provided in the connected portion C2 and on the head of the male screw.

8. A screw hole peripheral accommodation hole capable of accommodating a head portion of the male screw is provided on an outer peripheral edge portion h1s of the screw hole h1, The threaded portion of the male screw covered with the buffer spring is inserted through the screw hole h1 and screwed into the female screw provided in the screw hole h2. The head of the male screw presses the bottom of the screw hole peripheral receiving hole in the screw-in direction of the male screw, The buffer spring is contracted and accommodated inside the screw hole h1. The screw loosening prevention eyeglasses according to claim 7.

9. 3. The screw-loosening prevention eyeglasses according to claim 2, wherein a connected portion C2 provided at the other end of the end piece and a connecting portion C1 provided at the front end of the temple are rotatably connected by a hinge connection means having a loosening prevention mechanism, The hinge connection means having the loosening prevention mechanism is In a hinge connection means for fitting one piece of a connecting part C1 into a valley between two pieces of a connected part C2, the one piece is fixed so as to be rotatable between the valleys of the two pieces, The one piece having the screw hole h1 is inserted between the valleys of the two pieces having the screw holes h21 and h22, The threaded portion of the male screw covered with the buffer spring is inserted from the screw hole h22 of one of the two pieces, penetrates the screw hole h1 of the first piece, and is screwed into the female screw provided in the screw hole h21 of the other piece. The head of the male screw presses the outer peripheral edge portion h22s of the screw hole h22 in the screwing direction of the male screw, The glasses prevent screw loosening, in which the one piece of the connecting part C1 is fixed so as to be rotatable in the valley between the two pieces of the connected part C2.

10. A screw hole peripheral accommodation hole capable of accommodating the head of the male screw is provided on the outer peripheral edge portion h22s of the screw hole h22, The screw-in portion of the male screw covered with the buffer spring is inserted through the screw hole h22 and screwed into the female screw provided in the screw hole h21. The head of the male screw presses the bottom of the screw hole peripheral receiving hole in the screw-in direction of the male screw, The buffer spring is contracted and accommodated inside the screw hole h22. The screw loosening prevention eyeglasses according to claim 9.

11. One end of the end piece connected to the end of the rim is composed of an upper joint piece b having a fitting groove a at its inner end portion, and a lower joint piece d having a fitting groove c continuous with the fitting groove a at its inner end portion. The end of the rim to which one end of the end piece is connected is made up of upper and lower end portions g and h, The upper and lower end portions g and h of the rim are fitted and brazed into the fitting grooves a and c of the upper joint piece b and the lower joint piece d, 8. The screw-loosening prevention eyeglasses according to claim 7, wherein the upper joint piece b and the lower joint piece d are separably integrated by a fixed screw connection means having a loosening prevention mechanism, The fixed screw connection means having the loosening prevention mechanism is The upper joint piece b is a connecting portion C1, and the lower joint piece d is a connected portion C2. The male screw covered with the shock absorbing spring is inserted into the screw hole h1 of the connecting portion C1 through the screw hole h2 and h1 provided in the connected portion C2 and the connecting portion C1, respectively. The screw-threaded portion of the male screw is screwed into a female screw provided in a screw hole h2 of the connected portion C2, and the head of the male screw presses the outer peripheral edge portion h1s of the screw hole h1 of the connecting portion C1 in the screw-threaded direction, thereby fixing the male screw.

12. The upper connecting bridge connecting the left and right rims of the eyeglasses or the upper parts of the left and right rims, A pair of glasses capable of connecting flip-up sunglasses in which the left and right rims on which sunglasses lenses are attached are connected by a bridge at the center, A connection part C1 provided on the left and right rims or bridges of the flip-up sunglasses; The connected portion C2 is provided on the left and right rims of the eyeglasses or the upper connecting bridge of the eyeglasses, 4. Eyeglasses having a screw loosening prevention mechanism according to claim 3, which are rotatably connected by a hinge connection means having the loosening prevention mechanism.

13. 12. The screw loosening prevention eyeglasses according to claim 1, 2, 4, 7, 9 or 11, wherein the connecting portion C1 is replaced with the connected portion C1, and the connected portion C2 is replaced with the connecting portion C2.

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