Abstract:
An eyewear temple structure includes an attachment portion to be attached to a frame of an eyewear, and a temple attached to the attachment portion. The temple includes a housing having a hollow space therein, a front opening, a side opening, and a bump formed adjacent to the side opening. A guide member is slidably situated in the housing and includes a second projecting portion formed at one end to rotationally engage the attachment portion, and an abutment portion formed at the other end thereof. A compression coil spring is situated in the housing between the bump and the abutment portion to urge the guide member in a direction away from the bump. The temple is rotationally attached to the attachment portion through a resilient force of the coil spring.

Description:
BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT 
     The invention generally relates to an eyewear temple structure, in particular, a spring hinge provided on an eyewear temple. Common eyewear temples are generally categorized into rather wide temples made of metal or resin having low elasticity, and thinner temples using metal or resin having much elasticity. The present invention relates to a spring hinge which is provided particularly on the former rather wide temples made of metal or resin having low elasticity and enables the temple to open with elasticity. 
     FIG. 9 is a sectional view of the main components of a conventional spring hinge box  70 . A core rod  71  is inserted in a spring  73  as a sliding member, and it is surely difficult to use a member of wide diameter for a coil spring between the box and core rod. The rate of occurrence of damage to the spring part by using a thin spring is considerably high. 
     FIGS. 10A-10C are explanatory drawings in which the spring hinge box  70  is used on a low-elasticity and wide temple lly. If one attempts to make the width m smaller as in FIG. 10B, a small spring hinge box surely must be used. If so, as in FIG. 10C, as the vertical width 2h of the temple becomes greater, the force F, having twisted and turned left and right, comes to be applied more in the vicinity of a comma part  55  and a shaft screw  55   a  by the principle of a lever, and it becomes a cause of damage to the comma or projection part and shaft screw. 
     As shown in FIGS. 11A and 11B, this problem may be solved if the spring hinge box  71  is made larger and the spring hinge member inside is made larger, but the bulk width increases, it becomes more bulky and hard to handle and is aesthetically spoiled. Also, the weight of the temple part and a force for opening and bending are increased and are directly applied to the spring. Thus, serious accidents of bending of the screw also may occur. 
     An object of the present invention is to provide an eyewear temple with a spring hinge, which solves the problems described previously, and reduces damages to the hinge comma part, shaft screw and spring. 
     Another object of the invention is to provide an eyewear temple, which is made easier to handle so as not to be bulky, and is made so as not to be aesthetically spoiled. 
     Further objects and advantages of the invention will be apparent from the following description of the invention. 
     SUMMARY OF THE INVENTION 
     In an embodiment of the invention, on the front end of a metal temple, there is provided a hexahedral housing part, in which the front face and one side face of a front end are opened and the remaining four faces become walls. On the inner wall of another side face of the housing part and in the center of the opened front face, there is formed a bump serving as a spring stopping element, which is pierced by a blind hole for fastening screw. A U-shaped guide member has a comma part on each of the two free ends, wherein each of the comma parts is made to project inward from the front face of the temple front end, such that at least the comma shaft hole does not overlap with the inner corner part of the vertical wall of the temple. The guide member is tightly held in the temple housing part so as to be capable of sliding in the longitudinal direction of the temple. 
     A compression coil spring is housed within the two arms and the bottom part or abutment portion of the U-shaped guide member and the bump serving as the spring stopping element, so as to be capable of expanding and contracting in the longitudinal direction of the temple. 
     There is prepared a cover member, which has at least two through-holes for screws. One of the through-holes for screws is made to align with the blind hole for fastening screw of the spring stopping element, and the other is made to align with a blind hole for fastening screw, which is opened on the temple side face further back from the housing part. The open side of the temple is closed by the cover member and is fixed by screws, and a comma part on the frame side and the comma parts on both ends of the U-shaped guide member are connected by a shaft screw so as to be capable of opening out and swiveling. 
     By adopting the structure, it has become possible to provide the invention while reducing the damage to the above-mentioned comma parts, shaft screw, and spring, and without spoiling the aesthetics of the temple. Also, repair also has become easier to perform. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an exploded perspective view of a spring hinge part of a temple of the first embodiment of the present invention; 
     FIG. 2 is an exploded perspective view of the spring hinge part of the temple of the second embodiment of the present invention; 
     FIG. 3 is an exploded perspective view of the spring hinge part of the temple of the third embodiment of the present invention; 
     FIG. 4 is an exploded perspective view of the spring hinge part of the temple of the fourth embodiment of the present invention; 
     FIG. 5 is a front view from the inside of the spring hinge part of the temple of the fifth embodiment of the present invention; 
     FIG. 6 is a front view from the inside of the spring hinge part of the temple of the sixth embodiment of the present invention; 
     FIG. 7A is a plan view of the main components assembled from the state in FIG. 1; and FIG. 7B is a front view of the main components assembled from the state in FIG. 1; 
     FIG. 8A is a plan view of a modified example of FIG. 7A; and FIG. 8B is a front view of a modified example of FIG. 7A; 
     FIG. 9 is a sectional view of the main components of a conventional spring hinge; 
     FIG. 10A is a front view when the conventional spring hinge is used on a wide temple; FIG. 10B is a plan view of FIG. 10A; and FIG. 10C is an enlarged view of the main components taken along line  10 C— 10 C in FIG. 10A; 
     FIG. 11A is a front view for explaining when the spring hinge is made larger; and FIG. 11B is a plan view of FIG. 11A; and 
     FIG. 12 is a sectional view of the spring. 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     In FIG. 1, on a front end  12  of a metal temple  11 , there is provided a hexahedral housing part  14 , in which a front face  15  and one side face  13  of the front end  12  are opened and the remaining four faces become walls. On an inner wall  19  of another side face  18  of the housing part and in the center of the opened front face, there is formed a bump  16  serving as a spring stopping element, which is pierced by a blind hole  17  for fastening screw. 
     A U-shaped guide member  20  has a comma or projection part  22  on each of two free ends  21 . Each of the comma parts  22  is made to project inward from the front face of the temple front end, such that at least a shaft hole  24  does not overlap with an inner corner part  26  of the vertical wall of the temple. The guide member  20  is tightly held in the temple housing part  14  so as to be capable of sliding in the longitudinal direction of said temple. 
     A compression coil spring  30  is housed within the two arms  25 , a bottom or abutment part  27  of the U-shaped guide member  20  and the bump  16  serving as spring stopping element, so as to be capable of expanding and contracting in the longitudinal direction of the temple. There is prepared a cover member  31  which has at least two through-holes for screws, wherein one of the through-holes for screws is made to align with the blind hole  17  for fastening screw of the spring stopping element, and the other is made to align with a blind hole  17 ′ for fastening screw which is opened on the temple side face further back from the housing part. The open side of the temple is closed by the cover member  31  and is fixed by fastening screws  52 . Also, a comma or projection part  42  on an armor or attachment  41  and the comma parts  22  on both ends of the U-shaped guide member are connected by a shaft screw  51  so as to be capable of opening and swiveling. Also, an end  41   a  of the armor  41  is located at a side of the projection part  42 , and the side face  18  is located at a side of the comma parts  22 . 
     FIG. 7A is a plan view of the main components which are assembled from the state in the above-mentioned FIG. 1, and FIG. 7B is a side view seen from the inside. The end  41   a  abuts against the side face  18  when the temple  11  is opened. Also, in the drawing, each projection part  22  is made to project inward from the front face of the temple front end, to the minimum distance at which the shaft screw  51  can be inserted into the shaft hole and can be fixed by screw driver, such that at least the shaft hole  24  does not overlap with the inner corner part  26  of the vertical wall of the temple. 
     If the shaft hole is provided further inward of the minimum distance, it would no longer be possible to fix the shaft screw. Thus, in the state in which the outer perimeter  46  of each comma or projection part is inserted into the temple, at least the shaft hole  24  does not overlap with the inner corner part  26  of the vertical wall of the temple. In this state, the attachment portion is the least bulky in the temple and is preferable. 
     However, of course, it will be fine even in the conventional structure in which the outer perimeter  46 a of each comma or projection part is made to contact with or spaced apart from the inside face of the temple or the inside face of the frame, as in FIG.  8 A and FIG.  8 B. When viewed from the manufacturing method and number of steps, the example of the latter structure in FIG.  8 A and FIG. 8B is more simple, but in the aspect of aesthetics and easy handling, the example of the structure in FIG.  7 A and FIG. 7B is of course preferable. 
     Also, it goes without saying that the positions of the comma or projection part provided on the frame and the comma or projection part on the temple side must be made to overlap. Also, as is understood in FIG. 7B or FIG. 8B, everybody knows that it can be taken apart if the screw is removed when broken, and there is no more need for manuals which may be lost immediately. Also, as is clearly understood in FIG. 1, replacement of the spring is very easy, because it is not the case that a core rod passes through the spring and one end is fixed, and it can be removed as it is with a pin set and a new spring can be housed as it is in the same place. 
     FIG. 2 is a perspective view of the second embodiment. There is provided a hexahedral housing part  14   a,  in which a front face  15   a  and both side faces  13   a,    13   b  of the front end of the metal temple  11   a  are opened and the remaining three faces become walls. On the temple side face  13   c  further back from the housing part  14   a,  there is opened at least one through-hole  17   a  for fastening screw. 
     A U-shaped guide member  20   a  has a projection part  22   a  on each of the two free ends  21   a.  There are prepared two covers  31   a,    32  that close both side faces of the metal temple front end. On either one of them, there is provided a bump  16   a  serving as a spring stopping element, which has a hole  17   b  for fastening screw, so as to block the center of the front face of the metal temple front end, and at the back of the cover, there is provided a through-hole  17   c  for fastening screw. 
     Also, on the other cover, there are provided through-holes  17   d,    17   e  for fastening screws in the positions corresponding with the screw holes of the cover. The cover  32  which has the bump  16   a  serving as the spring stopping element having the hole  17   b  for fastening screw is provisionally fixed by a screw  52   a  in the through-hole  17   a  for fastening screw on the side face of the metal temple. Each of the projection parts  22   a  of the U-shaped guide member  20   a  is made to project inward from the front face of the temple front end, such that at least a shaft hole  24   a  does not overlap with the inner corner part  26   a  of the temple, and the guide member is tightly held in the metal temple housing part  14   a  so as to be capable of sliding in the longitudinal direction of the temple. 
     A compression coil spring  30   a  is housed within the two arms  25   a,  the bottom part  27   a  of the U-shaped guide member and the bump  16   a  serving as the spring stopping element, so as to be capable of expanding and contracting in the longitudinal direction of the metal temple  11   a.  The other cover  31   a  closes the other open side face of the metal temple housing part by a nut to the fastening screw  52   a  used for the provisional fastening on the side face of the metal temple, and a fastening screw fixed on the cover having the bump serving as spring stopping element. Also, a comma or projection part on the side of the frame and the comma or projection parts on both ends of the U-shaped guide member  20   a  are connected by a shaft screw  51   a  so as to be capable of opening and swiveling. 
     FIG. 3 is a perspective view of the third embodiment of the present invention. There is provided a first housing part  14   b  for sliding of a guide bar, which has an opening in the center of one side face  12   a  which continues from a center  28  of the front face  15   b  of the front end of a metal temple  11   b.  Continuing from the center  28 , there is provided a second housing part  14   c  further back from the back of the first housing part, which is vertically wider than the first housing part and has the same side face opened. There are provided holes  17   f  for fastening screws on an upper part  61  and a lower part  62  of the open side face of the front end of the metal temple  11   b,  and there are provided holes  17   g  for fastening screws on the side face on the back of the second housing part  14   c.    
     A T-shaped guide member  20   b  has a center column  23  with the T-shape as the guide bar  35 , and has a projection part  22   b  on the free end  21   b  of the guide bar  35 . The projection part  22   b  is made to project inward from the front face of the temple front end, such that at least the shaft hole  24   c  does not overlap with the inner corner part  26   b  of the temple, and the guide member  20   b  is held in the first housing part  14   b  and the second housing part  14   c  so as to be capable of sliding in the longitudinal direction of the temple. Two compression coil springs  30   b  are housed respectively in two gaps between the vertical wall of the second housing part  14   c  and the center column  23  of the T-shaped guide member. 
     There is prepared a cover member  31   b  which is provided with screw holes to meet with the holes  17   f,    17   g  for fastening screws provided on the side face of the metal temple, and the side face openings of the first housing part  14   b  for sliding of the guide bar and the second housing part  14   c  for housing of the guide member are closed by the cover member  31   b  and fixed by screws. Also, two comma or projection parts  42   a  on the frame side and the comma or projection part  22   b  on the free end of the T-shaped guide bar on the temple side are connected by a shaft screw  51   b  so as to be capable of opening and swiveling. 
     Next, FIG. 4 is the fourth embodiment of the present invention. There is provided a first housing part  14   d  for sliding of a guide bar, which has openings  33 ,  33   a  on both side faces continuing from the center of the front face  15   c  of the front end of a metal temple  11   c.  Also, a second housing part  14   e  continues further back from the back of the first housing part, which is wider than the first housing part and has the same two side faces opened. There are provided through-holes  17   h  for fastening screws respectively on the upper part and the lower part of the front end of the metal temple, and there are provided through-holes  17   j  for fastening screws on the side face on the back of the second housing part  14   e.    
     A T-shaped guide member  20   c  uses a center column  23   a  of the T-shape as a guide bar  35   a  and has a comma or projection part  22   c  on the free end of the guide bar  35   a.  The comma part  22   c  is made to project inward from the front face of the temple front end, such that at least a shaft hole  24   e  does not overlap with the inner corner part  26   c  of the temple. The guide member is tightly held in the first housing part  14   d  for sliding of the guide bar and the second housing part  14   e  so as to be capable of sliding in the longitudinal direction of the temple. 
     Two compression coil springs  30   c  are housed respectively in two gaps between the vertical wall of the second housing part  14   e  and the center column  23   a  of the T-shaped guide member. Two cover members  32   a,    31   c  are prepared. There are provided screw holes also on the two cover members so as to meet with the through-holes  17   h,    17   j  for screws provided on the side face of the metal temple, and the two open side faces of the first and second housing part are closed by the two cover members. Also, two comma or projection parts  42   b  on the frame  41   c  side and the comma part  22   c  on the free end of the T-shaped guide bar on the temple side are connected by a shaft screw  51   c  so as to be capable of opening and swiveling. 
     FIG. 5 is the fifth embodiment of the present invention. There is provided a housing part  14   f,  in which a front face and one side face of a hexahedral metal box  80  are opened and the remaining four faces become walls. On the inner wall of another side face and in the center of the opened front face, there is formed a bump  16   b  serving as a spring stopping element, which is pierced by a blind hole  17   m  for fastening a screw. The side face on the back of the housing part is made to have the width and thickness such that a blind hole  17   k  for fastening screw can be provided. 
     A U-shaped guide member  20   d  has a comma or projection part  22   d  on each of the two free ends. Each of the comma parts is made to project inward from the front face of the metal box, such that at least shaft holes  24   g  do not overlap with the inner corner part  26   d  of the vertical wall of the metal box. The guide member is tightly held in the housing part of the metal box so as to be capable of sliding in the longitudinal direction of the metal box, and a compression coil spring  30   d  is housed within the two arms, the bottom part of the U-shaped guide member and the bump serving as a spring stopping element, so as to be capable of expanding and contracting in the longitudinal direction of the temple. 
     There is provided a cover member  31   d  which has at least two through-holes for screws, wherein one of the through-holes for screws is made to align with the blind hole for fastening screw of the spring stopping element, and the other is made to align with the blind hole  17   k  for fastening screw which is opened on the thickened wall face further back from the housing part. The opened one side face of the metal box is closed by the cover member and fixed by screws. On the outer wall face on the back of the hexahedral metal box  80 , there is provided a metal core  90  which is inserted into a resin temple  110 . The metal core is inserted from the front end of the resin temple  110 , and the hexahedral metal box is inserted up to the front end of the resin temple and is fixed. Also, a comma or projection part on the frame side and the comma or projection parts on both ends of the U-shaped guide member are connected by a shaft screw so as to be capable of opening and swiveling. 
     FIG. 6 is the sixth embodiment of the present invention. There is provided a first housing part  14   g  for sliding of a guide bar, which continues from one side face to a center of the front face of a hexahedral metal box  81 , and a second housing part  14   h  continues further back from the first housing part, which is wider than the first housing part and has the same side face opened. There are provided holes for fastening screws on the upper part and the lower part of the open side face of the front end of the metal box, and there are provided holes  17   n  for fastening screws on the side face on the back of the second housing part  14   h.    
     A T-shaped guide member  20   e  uses the center column  23   b  of the T-shape as the guide bar  35   b,  and has a comma or projection part  22   e  on the free end  21   b  of the guide bar. The comma or projection part is made to project inward from the front face of the temple front end, such that at least a shaft hole does not overlap with the inner corner part  26   e  of the metal box. The guide member is tightly held in the first housing part for sliding of the guide bar and the second housing part so as to be capable of sliding in the longitudinal direction of the metal box. 
     Two compression coil springs  30   e  are housed respectively in two gaps between the vertical wall of the second housing part and the center column of the T-shaped guide member. A cover member  31   e  is prepared, and has screw holes for meeting with the holes for fastening screws on the open side face of the front end of the metal box and the side face of the back of the second housing part. The open side faces of the first housing part for sliding of the guide bar and the second housing part for housing the guide member are closed by the cover and fixed by screws. 
     On the outer wall face on the back of the hexahedral metal box  81 , there is provided a metal core  91  which is inserted into a resin temple  110   a.  The metal core is inserted from the front end of the resin temple  110   a,  and the hexahedral metal box is inserted up to the front end of the resin temple and is fixed. Also, a comma or projection part on the frame side and the comma or projection parts on both ends of the U-shaped guide member are connected by a shaft screw so as to be capable of opening and swiveling. 
     In the present invention, because it is sufficient even without inserting the core rod  71  inside the spring  73  as in the prior He art in FIG. 9, the diameter  74  of the spring material can be made thicker as shown in FIG. 12, and in a wide temple, it is possible to sufficiently withstand the spreading, bending, and twisting forces. Also, according to the present invention as noted above, concerning the use of a wide temple made of metal or resin, it is sufficient even if the box does not become bulky as in the conventional spring hinge, it can be made more shapely in design, and it contributes to the prevention of the occurrence of damage due to insufficient strength and the prevention of the occurrence of damage to the projection part and the shaft screw due to stress. Moreover, it contributes to the simplification of the operation when disassembling and repairing, quick response at the retail store is possible, and it can greatly increase customer satisfaction. 
     While the invention has been explained with reference to the specific embodiments of the invention, the explanation is illustrative and the invention is limited only by the appended claims.