JPWO2009028361A1 - Hinge device - Google Patents

Abstract

Provided is a hinge device that can prevent the wear of the cam member and the top of the contact member that contacts the cam member, and is easy to manufacture. The chevron cam member 9 is molded of resin, and at least its top portion 12 is made of a material having a hardness higher than that of the resin. The contact member 7 is made of a material having at least a top portion 15 having a hardness higher than that of the resin. By opening and closing the second member with respect to the first member, the top portion 15 of the contact member 7 gets over the top portion 12 of the cam surface 11a of the angle cam member 9. Since the top portions 12 and 15 of the chevron cam member 9 and the contact member 7 are made of a material having a hardness higher than that of the resin, the top portion 15 of the contact member 7 gets over the top portion 12 of the cam surface 11a of the chevron cam member 9. Sometimes it is possible to prevent wear of the top portions 12,15.

Description

  The present invention relates to a hinge device that opens and closes a second member relative to a first member.

  In portable devices such as mobile phones and portable game machines, an operation side housing (first member) in which key buttons are arranged and a display side housing (second member) in which a display device such as a liquid crystal display device is arranged. Are often connected via a hinge device so that they can be opened and closed. If the operation-side casing and the display-side casing can be folded, it is possible to prevent the key buttons from malfunctioning when the portable device is not used.

  As this type of hinge device, there is known a hinge device that automatically opens the first member and the second member by the spring force of the coil spring when the closed first member and second member are manually opened to a predetermined angle. (See, for example, Patent Document 1). The hinge device automatically fully closes the first member and the second member by the spring force of the coil spring even when the opened first member and the second member are manually closed to a predetermined angle.

  As shown in FIG. 16, the hinge device includes a cylindrical first coupling body 41 coupled to the first member, a coil spring 42 accommodated in the first coupling body 41, and a first coupling. The cam member 43 accommodated in the body 41 and the 2nd connection body 44 connected with a 2nd member are provided. The cam member 43 is formed with a mountain-shaped cam surface 43a. The second coupling body 44 is formed with a cam engaging portion 44 a that abuts on the cam surface 43 a of the cam member 43. The cam member 43 can slide in the direction of the axis with respect to the first coupling body 41, but cannot rotate around the axis. The second connecting body 44 can rotate around the axis with respect to the first connecting body 41, but cannot slide in the direction of the axis. When the second member is manually rotated with respect to the first member, the top of the cam engagement portion 44 a of the second coupling body 44 gets over the top of the cam surface 43 a of the cam member 43. When this happens, the cam member 43 automatically slides toward the second connecting body 44 by the spring force of the coil spring 42, and the second connecting body 44 automatically rotates in conjunction with the sliding of the cam member 43. To do.

  Patent Document 2 also discloses a hinge device that opens and closes a first member and a second member, similarly to the hinge device disclosed in Patent Document 1. As shown in FIG. 17, the hinge device includes a cam member 51 having a cam surface 51 a and a cam follower 52 that contacts the cam surface 51 a of the cam member 51. The cam member 51 is accommodated in a cylindrical case 53 so as to be movable in the direction of the axis, and is biased to the cam follower 52 by a coil spring 54. The cam follower 52 is accommodated in the case 53 so as to be rotatable. When the second member is manually rotated with respect to the first member, the top of the cam follower 52 gets over the top of the cam surface 51 a of the cam member 51. At that time, the cam member 51 automatically slides toward the cam follower 52 by the spring force of the coil spring 54, and the cam follower 52 automatically rotates.

JP 2004-68939 A (see paragraphs [0033] to [0040]) Japanese Patent No. 3883607 (see paragraphs [0030] to [0032])

  However, in the hinge device described in Patent Document 1, both the cam member 43 and the second coupling body 44 are resin molded products. When the top part of the second connecting body 44 gets over the top part of the cam member 43, a large pressure acts on both top parts, so that the top parts of the cam member 43 and the second connecting body 44 are worn. As shown in FIG. 18, when the top portions of the cam member 43 and the second coupling body 44 are worn, the sharp top portions are rounded. Due to this, the inclination of the tangent 46 of the contact point between the top of the cam member 43 and the top of the second coupling body 44 also becomes gentle, and the holding force for holding the closed state of the first member and the second member decreases. End up.

  For example, when the cellular phone is closed, the power is automatically turned off to save power. If the holding force for holding the closed state is weak and the mobile phone opens even a little, there arises a problem that the display is kept on.

  On the other hand, in the hinge device described in Patent Document 2, since the cam member 51 and the cam follower 52 are made of metal, both top portions are not easily worn. However, the cam member 51 and the cam follower 52 are manufactured by metal injection molding or cutting. Manufacturing by a metal injection mold requires a process of sintering after molding, which complicates the process and increases the cost. In addition, since the shrinkage rate after sintering is high, there is a problem that dimensional variation occurs. Cutting is performed one by one, so it is not suitable for mass production.

  Therefore, an object of the present invention is to provide a hinge device that can prevent wear of the cam member and the top of the abutting member that abuts against the cam member and is easy to manufacture.

The present invention will be described below.
In order to solve the above-mentioned problem, the invention according to claim 1 is a mountain-shaped cam member that rotates with one of the first member and the second member and has a mountain-shaped cam surface including the top, and the first member or A hinge member that rotates together with the other of the second members and has a top portion that abuts against the cam surface of the chevron cam member, and enables the second member to be opened and closed with respect to the first member. One of the chevron cam member or the abutting member is molded of resin and at least the top part is made of a material having a hardness higher than that of the resin, and the chevron cam member or the other of the abutting member is at least A hinge device having a top portion made of a material having a hardness higher than that of the resin, and the top portion of the contact member climbs over the top portion of the cam surface of the angle cam member by opening and closing the second member with respect to the first member. That.

  According to a second aspect of the present invention, in the hinge device according to the first aspect, the chevron cam member and the abutting member are both molded from resin, and at least the top thereof has higher hardness than the resin. It is composed of a material.

  According to a third aspect of the present invention, in the hinge device according to the first or second aspect, the top portion of the chevron cam member is made of a rolling element made of a material having a hardness higher than that of the resin, and the resin of the chevron cam member It is embedded in a cam surface molded by the above-mentioned method so as to be rotatable.

  According to a fourth aspect of the present invention, in the hinge device according to any one of the first to third aspects, the contact member has a mountain-shaped cam surface including a top portion, and the top portion of the contact member is It is made of a rolling element made of a material having a hardness higher than that of resin, and is embedded rotatably in a cam surface formed by the resin of the contact member.

  According to a fifth aspect of the present invention, in the hinge device according to the second aspect, the contact member has a mountain-shaped cam surface including a top portion, and the top portion of the contact member is a top portion of the mountain-shaped cam member. The top of the contact member and the top of the chevron cam member are in contact with each other, and before or after the top of the contact member crosses the top of the chevron cam member, the contact member is made of resin. The cam surface and the resin cam surface of the angle cam member are in contact with each other.

  The invention according to claim 6 is the hinge device according to claim 1, wherein the contact member has a mountain-shaped cam surface including a top portion, and the top portion and the cam surface of the contact member are: It is made of a material having a hardness higher than that of resin, and the top of the chevron cam member slides while contacting the top of the contact member and the cam surface by opening and closing the second member relative to the first member. It is characterized by that.

  According to a seventh aspect of the present invention, in the hinge device according to any one of the first to sixth aspects, the hinge device further accommodates the angle cam member and has a cylindrical case made of a material harder than resin. The portion of the chevron cam member that contacts the cylindrical case is molded of resin, and the chevron cam member can slide in the direction of the cylindrical case axis and cannot rotate about the axis. The abutting member can rotate around the axis and cannot slide in the direction of the axis.

  According to the first aspect of the present invention, since the top portions of the angle cam member and the contact member are made of a material having a hardness higher than that of the resin, the top portion of the contact member is the top portion of the cam surface of the angle cam member. When climbing over, it is possible to prevent wear of the top portions of the contact member and the angle cam member. Further, since at least one of the chevron cam member and the contact member is molded from resin, manufacturing is also facilitated.

  According to the second aspect of the present invention, since both the angle cam member and the abutting member are molded from resin, the manufacture becomes easier.

  According to the third aspect of the present invention, since the rolling element is rotatably embedded in the cam surface of the angle cam member, when the top of the contact member gets over the peak of the angle cam member, The top rolls. Therefore, it is possible to prevent the top portion of the angle cam member from being worn.

  According to the invention described in claim 4, since the rolling element is rotatably embedded in the cam surface of the contact member, when the top of the contact member gets over the top of the angle cam member, The top rolls. Therefore, it is possible to prevent the top portion of the contact member from being worn.

  According to the fifth aspect of the present invention, it is possible to reduce the wear of the resin cam surface of the angle cam member or the contact member.

  According to the invention described in claim 6, it is possible to prevent the cam surface of the contact member from being worn.

  According to the seventh aspect of the present invention, since the cylindrical case is made of a material having a hardness higher than that of the resin and the mountain cam member that slides along the cylindrical case is made of resin, the thickness of the cylindrical case can be reduced. The sliding resistance of the angle cam member with respect to the cylindrical case can be reduced.

The perspective view which shows the mobile telephone with which the hinge apparatus of 1st embodiment of this invention is integrated. Exploded perspective view of the mobile phone The perspective view of the hinge apparatus of 1st embodiment of this invention External view of hinge device ((a) is a plan view, (b) is a front view, (c) is a bottom view, (d) is a side view) Cross section of hinge device Exploded perspective view of hinge device Perspective view of contact member and angle cam member The figure which shows the relationship between the opening angle of a mobile telephone, and the movement of a chevron cam member and a contact member The figure which shows the state when the top part of a contact member gets over the top part of a mountain-shaped cam member ((a) in a figure shows the state which both top parts contact | abutted, (b) in the figure is the state before getting over or after getting over. Indicate) Exploded view of cam surface of contact member and angle cam member The disassembled perspective view of the hinge apparatus of 2nd embodiment of this invention Cross-sectional view of the hinge device Exploded view of cam surface of contact member and angle cam member The disassembled perspective view of the hinge apparatus of 3rd embodiment of this invention Cross-sectional view of the hinge device Exploded perspective view of a conventional hinge device Exploded perspective view of a conventional hinge device The figure which shows the state with which the top part of the cam member and the 2nd coupling body was worn out.

Explanation of symbols

1 .. Operation side housing (first member)
2 ... Display side housing (second member)
4 ... Hinge device 6 ... Cylindrical case 7 ... Contact member 9 ... Angle cam member 11a ... Cam surfaces 12, 15 ... Top 14a ... Cam surface 27a ... Cam surface 27 ... Contact member 28 ... Top 29 ... Angle cam member 29a ... Cam surface 30 ... Contact member 30a ... Cam surface 33 ... Top 37 ... Top

  Hereinafter, a hinge device according to a first embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a mobile phone in which a hinge device is incorporated. The mobile phone includes an operation side housing 1 (first member) in which key buttons are arranged, and a display side housing 2 (second member) in which a display device 3 such as a liquid crystal display device is arranged. The operation-side casing 1 is provided with a small microphone and various key buttons. The display-side housing 2 is provided with a small speaker and a liquid crystal display device 3.

  Two connecting tube portions 1 a are provided at the end of the operation-side housing 1. The two connecting cylinder portions 1a are disposed at both ends in the left-right direction of the operation-side casing 1. The operation-side casing 1 is divided into two parts: a front-side split casing 1b on which key buttons are arranged, and a back-side split casing 1c. At one end of the display-side housing 2, one connecting cylinder portion 2 a sandwiched between two connecting cylinder portions 1 a of the operation-side housing 1 is provided. The center line of the connection cylinder part 1a of the operation side housing | casing 1 and the center line of the connection cylinder part 2a of the display side housing | casing 2 correspond mutually.

  FIG. 2 shows an exploded perspective view of the mobile phone. The display-side housing 2 and the operation-side housing 1 are connected via a hinge device 4 so as to be able to rotate around the center line L. The hinge device 4 and the dummy hinge 5 are inserted into the connecting cylinder portion 2a of the display-side casing 2 from both ends in the axial direction. A plurality of flat surfaces 6 a are provided on the outer surface of the cylindrical case 6 of the hinge device 4. The connecting cylinder portion 2 a is also provided with a flat surface corresponding to the flat surface 6 a of the cylindrical case 6. When the hinge device 4 is inserted into the connecting cylinder portion 2a, the flat surface 6a of the cylindrical case 6 and the flat surface of the connecting cylinder portion 2a come into contact so that the cylindrical case 6 rotates together with the connecting cylinder portion 2a. The dummy hinge 5 has a cylindrical shape.

  A part of the hinge device 4 and a part of the dummy hinge 5 protruding from the connecting cylinder part 2a are sandwiched between the front divided housing 1b and the rear divided housing 1c. The contact member 7 of the hinge device 4 is provided with a flat surface 7a. A flat surface corresponding to the flat surface 7a of the contact member 7 is provided in the front-side divided housing 1b. When the contact member 7 of the hinge device 4 is sandwiched between the front divided housing 1b and the rear divided housing 1c, the flat surface 7a of the front member contacts the flat surface 7a of the contact member 7. For this reason, the contact member 7 rotates together with the operation side housing 1. Since the contact member 7 of the hinge device 4 rotates relative to the cylindrical case 6, the display side housing 2 eventually rotates relative to the operation side housing 1.

  FIG. 3 shows a perspective view of the hinge device 4, and FIG. 4 shows the hinge device 4 seen from four different directions. In any figure, the state which has turned the axial line of the cylindrical hinge apparatus 4 to the perpendicular direction is shown. The hinge device 4 includes a cylindrical case 6 having a bottomed cylindrical shape and a contact member 7 accommodated inside the cylindrical case 6. On the side surface of the cylindrical case 6, for example, four flat surfaces 6a are provided at equal intervals in the circumferential direction. The flat surface 6a extends partway from the upper end to the lower end of the cylindrical case 6. The cylindrical case 6 is manufactured by pressing a thin metal plate.

  The lower end portion of the contact member 7 protrudes from the lower end of the cylindrical case 6. A part of the contact member 7 protruding from the lower end of the cylindrical case 6 is provided with a pair of flat surfaces 7a parallel to each other.

  FIG. 5 shows a sectional view of the hinge device 4, and FIG. 6 shows an exploded perspective view. In the cylindrical case 6, coil springs 8a and 8b, a chevron cam member 9, and a contact member 7 which are urging means are sequentially accommodated.

  The coil springs 8 a and 8 b are interposed between the bottom portion 6 b of the cylindrical case 6 and the chevron cam member 9 and bias the chevron cam member 9 toward the contact member 7. In order to increase the urging force, the coil springs 8a and 8b are provided in double on the inside and outside.

  As shown in FIG. 6, the chevron cam member 9 includes a resin main body 11 and a top 12 made of a material having a hardness higher than that of the resin. The material having higher hardness than the resin is, for example, metal or ceramic. It is desirable to use high-strength engineering plastics for the resin. It is desirable to use steel for the metal, and it is desirable to use a fine ceramic with high strength for the ceramic.

  FIG. 7 shows a detailed view of the angle cam member 9 and the contact member 7. A mountain-shaped cam surface 11 a is formed on the lower end surface of the resin main body 11. On the cam surface 11a, a top portion and a trough portion are repeatedly formed twice in the circumferential direction (see also FIG. 8). The cam surface 11a is formed point-symmetrically about the axis. A plurality of flat surfaces 11 b corresponding to the flat surface of the cylindrical case 6 are formed on the side surface of the main body 11. Since the flat surface 11b of the main body part 11 and the inner surface of the cylindrical case 6 are in plane contact, the main body part 11 can slide in the axial direction of the cylindrical case 6 with respect to the cylindrical case 6, and Cannot rotate around the axis. A through-hole 11c extending in the axial direction is opened at the center of the main body 11. The shaft portion 14b of the contact member 7 passes through the through hole 11c. The main body 11 is a molded product of resin.

  The top part 12 which becomes the vertex of the cam surface 11a of the main body part 11 is made of a metal roller which is a rolling element. A recess 11d (see FIG. 9) corresponding to the shape of the roller is formed on the resin cam surface 11a. The top portion 12 is embedded in the recess 11d. The top 12 is not coupled to the recess 11d and can rotate relative to the recess 11d.

  The abutting member 7 includes a resin main body 14 and a top 15 made of a material having a hardness higher than that of the resin. The material of the main body 14 and the top 15 is the same as that of the angle cam member 9.

  The main body portion 14 extends in the axial direction of the cylindrical case 6, and includes a shaft portion 14 b that penetrates the chevron cam member 9, a mountain-shaped cam surface 14 a that faces the cam surface 11 a of the chevron cam member 9, and the main body portion 14. The connecting shaft portion 14d extends downward. The shaft portion 14b is processed with a fluid passage groove 14b1 extending downward from the upper end to the middle of the shaft portion 14b.

  On the cam surface 14a, a top portion and a trough portion are alternately and repeatedly formed in the circumferential direction twice. The cam surface 14a is formed point-symmetrically about the axis. The cam surface 11a of the chevron cam member 9 and the cam surface 14a of the abutment member 7 interlock the sliding motion of the chevron cam member 9 and the rotational motion of the abutment member 7. Note that the cylindrical portion on which the cam surface 14a is formed may be molded separately from the shaft portion 14b and the connecting shaft portion 14d.

  The top 15 which is the apex of the cam surface 14a of the main body 14 is made of a metal roller which is a rolling element. A recess 14e (see FIG. 9) corresponding to the shape of the roller is formed on the resin cam surface 14a. The top portion 15 is rotatably embedded in the recess 14e. The cam surface 11a of the angle cam member 9 and the cam surface 14a of the contact member 7 are opposed to each other so that the top portions 12 and 15 do not fall off the recesses 11d and 14e of the cam surfaces 11a and 14a.

  The hinge device is assembled as follows. As shown in FIG. 6, first, the top portions 12 and 15 made of rollers are embedded in the main body portion 11 of the angle cam member 9 and the main body portion 14 of the contact member 7. Next, the shaft portion 14 b of the contact member 7 is passed through the through hole 11 c of the angle cam member 9. Coil springs 8a and 8b are inserted in the cylindrical case 6 in advance and a viscous fluid is injected.

  Next, the assembly of the angle cam member 9 and the contact member 7 is inserted into the cylindrical case 6. Thereafter, the O-ring 16, the bearing 17, and the washer 18 are sequentially fitted on the outer periphery of the contact member 7. After the washer 18 is fitted to the contact member 7, the periphery of the open end portion of the cylindrical case 6 is bent inward so as to hold the washer 18. Thus, the hinge device is assembled.

  As shown in FIG. 5, the O-ring 16 is fitted to the outer periphery of the stepped portion of the lower part of the contact member 7 to prevent the viscous fluid 20 filled in the cylindrical case 6 from leaking. The washer 18 is fixed to the cylindrical case 6. The bearing 17 is rotatably supported by the washer 18 and can rotate while sliding with respect to the washer 18. The bearing 17 has an opening that matches the cross-sectional shape of the connecting shaft portion 14d. Both the bearing 17 and the contact member 7 rotate.

  The contact member 7 rotates around the axis of the cylindrical case 6. The tip end portion of the shaft portion 14 b of the contact member 7 contacts the bottom portion 6 b of the cylindrical case 6. The rotation of the upper portion of the contact member 7 is guided by the bottom portion 6 b of the cylindrical case 6. The lower part of the contact member 7 is prevented from being removed from the cylindrical case 6 by a washer 18. The bearing 17 is made of resin. The outer peripheral surface of the bearing 17 rotates while contacting the inner peripheral surface of the cylindrical case 6. The rotation of the lower part of the contact member 7 is guided by the bearing 17. That is, the rotation of the abutting member 7 is supported at two locations above and below the cylindrical case 6. Since the portion of the contact member 7 that contacts the cylindrical case 6 is made of resin, the contact member 7 rotates smoothly with respect to the metal cylindrical case 6.

  The chevron cam member 9 slides in the direction of the axis of the cylindrical case 6. Since the portion of the chevron cam member 9 that contacts the cylindrical case 6 is made of resin, the chevron cam member 9 can slide smoothly relative to the cylindrical case 6.

  FIG. 8 is a diagram showing the relationship between the opening angle of the mobile phone, the position of the angle cam member 9 in the axial direction, and the rotation angle of the contact member 7. In the figure, the upper stage shows the opening angle of the mobile phone, and the lower stage shows the positional relationship between the angle cam member 9 and the contact member 7. By the angle cam member 9, the internal space of the cylindrical case 6 is partitioned into a first space S1 and a second space S2 in the axial direction. Each of the first space S1 and the second space S2 is filled with the viscous fluid 20. As the mountain cam member 9 slides, the viscous fluid 20 moves between the first space S1 and the second space S2.

  As shown in FIG. 5A, when the cellular phone is closed, the first inclined surface 14a1 of the cam surface 14a of the contact member 7 and the first inclined surface 11a1 of the cam surface 11a of the angle cam member 9 are shown. Touch. At this time, due to the spring force of the coil springs 8a and 8b, the angle cam member 9 slides further downward and the contact member 7 tries to rotate, but the folded operation side case 1 and display side case 2 Is in contact, the rotation of the contact member 7 is restricted.

  When the display-side housing 2 is manually opened slightly (for example, 30 degrees) from the closed state, the contact member 7 rotates together with the display-side housing 2, and the top portion 15 of the contact member 7 is Get on top 12 ((b) in the figure). At this time, the angle cam member 9 moves slightly upward in the figure against the spring force of the coil springs 8a and 8b. When the display-side casing 2 is further opened (when the opening angle of the display-side casing 2 exceeds 30 ° of the conversion point shown in FIG. 5B), the top portion 15 of the contact member 7 is The second inclined surface 14a2 of the contact member 7 and the second inclined surface 11a2 of the angle cam member 9 come into contact with each other over the top portion 12. When this happens, the angle cam member 9 automatically slides downward in the figure by the spring force of the coil springs 8a and 8b, and the contact member 7 automatically rotates, as shown in FIGS. Thus, the mobile phone automatically opens until it is fully opened.

  Between the fluid passage groove 14b1 of the shaft portion 14b and the inner peripheral surface of the angle cam member 9, there is provided a fluid passage P that guides the viscous fluid from one of the first space S1 and the second space S2 to the other. The fluid passage P changes the resistance of the fluid when the viscous fluid is guided by the downward sliding motion of the angle cam member 9 and the rotational motion of the contact member 7. When the opening angle exceeds 120 degrees, the resistance of the fluid in the fluid passage increases, and a braking force is applied to the opening operation of the display-side casing 2. This braking force reduces the impact when the display-side housing 2 is fully opened.

  When closing the opened cellular phone, the operation is the reverse of the above-described operation. First, the display-side casing 2 is manually folded against the spring force of the coil springs 8a and 8b, and the opening angle of the mobile phone is set to 30 degrees. At this time, the top 15 of the contact member 7 and the top 12 of the angle cam member 9 come into contact. When the opening angle is less than 30 degrees, the top portion 15 of the contact member 7 gets over the top portion 12 of the angle cam member 9, and the cellular phone is automatically closed to 0 degrees by the spring force of the coil springs 8a and 8b.

  9A shows a state where the top 15 of the contact member 7 gets over the top 12 of the angle cam member 9, and FIG. 9B shows the state where the top 15 of the contact member 7 is the angle cam member 9. The state after getting over the top 12 is shown. As shown in FIG. 9A, when the top 15 of the contact member 7 gets over the top 12 of the angle cam member 9, both the tops 12 and 15 come into contact with each other. Although both top portions 12 and 15 are compressed by the spring force of the coil springs 8a and 8b, both the top portions 12 and 15 are made of a material having a hardness higher than that of the resin. 15 can be prevented from being worn. In addition, since the top portions 12 and 15 are rotatably embedded in the angle cam member 9 and the contact member 7, the top portions 12 and 15 can also roll when the top portions 12 and 15 contact each other. Therefore, it is possible to further prevent the top portions 12 and 15 from being worn. As shown in FIG. 9B, after the top portion 15 of the contact member 7 has passed over the top portion 12 of the angle cam member 9, both the top portions 12 and 15 do not contact each other, and the top portion of the contact member 7. 15 and the cam surface 11a of the angle cam member 9 come into contact with each other, and the top portion 12 of the angle cam member 9 and the cam surface 14a of the contact member 7 come into contact with each other.

  FIG. 10 is a development view of the cam surfaces 11 a and 14 a of the contact member 7 and the angle cam member 9. When the cellular phone is closed (opening angle 0 degree), the top 15 of the abutting member 7 and the first inclined surface 11a1 of the cam surface 11a of the chevron cam member 9 come into contact with the top 12 of the chevron cam member 9. The first inclined surface 14a1 of the cam surface 14a of the contact member 7 contacts. When the cellular phone is opened from 15 ° to 45 ° from this state, both the top portions 12 and 15 of the contact member 7 and the angle cam member 9 contact each other, and the top portion 15 of the contact member 7 gets over the top portion 12 of the angle cam member 9. . After the top portion 15 of the contact member 7 has climbed over the top portion 12 of the angle cam member 9 (when the mobile phone is in the open state of 90 ° to 165 °), the second of the cam surface 14a of the contact member 7 is reached. The inclined surface 14a2 and the second inclined surface 11a2 of the cam surface 11a of the angle cam member 9 abut. Since the cam surface 14a of the contact member 7 and the cam surface 11a of the angle cam member 9 are in surface contact, it is possible to prevent the cam surfaces 11a and 14a from being worn.

  11 and 12 show a hinge device according to a second embodiment of the present invention. The hinge device according to this embodiment is different from the hinge device according to the first embodiment in that the entire hinge including the top of the contact member 27 is made of a metal having a hardness higher than that of the resin. Since the configurations of the remaining cylindrical case 6, coil springs 8a and 8b, angle cam member 9, O-ring 16, bearing 17 and washer 18 are the same as those in the first embodiment, the same reference numerals are used for the description. Is omitted.

  The rotation of the contact member 27 is guided by the bearing 17 and the inner peripheral surface of the cylindrical case 6, and a slight gap is opened between the outer periphery of the contact member 27 and the cylindrical case 6. For this reason, even if both the cylindrical case 6 and the contact member 27 are made of metal, the rotational movement of the contact member 27 is not often deteriorated. For this reason, in this embodiment, the whole contact member 27 is made of metal.

  On the other hand, torque is always applied to the chevron cam member 9 by the reaction force from the contact member 27, and the chevron cam member 9 is always in contact with the cylindrical case 6. If the chevron cam member 9 is made of metal, abrasion occurs when the chevron cam member 9 slides with respect to the cylindrical case 6, and the chevron cam member 9 moves poorly. For this reason, also in this embodiment, the portion of the angle cam member 9 that contacts the cylindrical case 6 is made of resin.

  FIG. 13 is a development view of the cam surfaces 27 a and 11 a of the contact member 27 and the angle cam member 9. From the closed state (opening angle 0 °) to the open state (opening angle 165 °), the top portion 12 of the mountain-shaped cam member 9 has a mountain-shaped cam surface 27 a including the top portion 28 of the contact member 27. Always slides in contact with the cam surface 27a. Since the cam surface 27a of the contact member 27 is made of metal, even if the top portion 12 of the mountain-shaped cam member 9 slides on the mountain-shaped cam surface 27a of the contact member 27, the cam surface 27a can be prevented from being worn. .

  14 and 15 show a hinge device according to a third embodiment of the present invention. FIG. 14 is an exploded perspective view of the hinge device, and FIG. 15 is a cross-sectional view. In this embodiment, a coil spring that urges the angle cam member 29 toward the contact member 30 is not provided. Instead of the coil spring, a resin urging member 31 that rotates together with the contact member 30 is provided.

  The biasing member 31 has a substantially cylindrical shape, and a biasing cam surface 31a is formed on the lower end surface thereof. The urging cam surface 31 a is formed in the same mountain shape as the cam surface 30 a of the contact member 30. A top portion 32 made of a metal roller is rotatably embedded in the biasing cam surface 31a.

  As in the first and second embodiments, a mountain-shaped cam surface 29 a is formed on the lower end surface of the resin mountain-shaped cam member 29. A metal roller is rotatably embedded as a top 33 in the cam surface 29a. A biasing cam surface 29 b is formed on the upper end surface of the angle cam member 29 so as to face the biasing cam surface 31 a of the biasing member 31. The biasing cam surface 29b of the angle cam member 29 is also formed in the same mountain shape as the cam surface 29a. A metal roller is embedded in the urging cam surface 29b as a top portion 33 so as to be rotatable.

  A through hole 30b is formed in the resin contact member 30 in a direction perpendicular to the axis. A pin 36 for rotating both the contact member 30 and the biasing member 31 is inserted into the through hole 30b. The contact member 30 is formed with a mountain-shaped cam surface 30a as in the first embodiment. A roller is rotatably embedded as a top portion 37 in the cam surface 30a. Since the configurations of the cylindrical case 6, the O-ring 16, the bearing 17 and the washer 18 are the same as those of the hinge device of the first and second embodiments, the same reference numerals are given and description thereof is omitted.

  When the contact member 30 is rotated with respect to the cylindrical case 6, the angle cam member 29 sandwiched between the contact member 30 and the biasing member 31 slides in the vertical direction. The hinge device of this embodiment is used for a connecting portion between a toilet seat and a toilet lid on which a rotating force is applied by the weight of the toilet seat.

  In addition, this invention is not limited to the said embodiment, In the range which does not change the summary of this invention, it can embody in other embodiment. For example, the hinge device may be directly accommodated in the first and second members without being accommodated in the cylindrical case. Even when the hinge device is accommodated in the cylindrical case, the contact member may be exposed from the cylindrical case, and the contact member may be directly accommodated in the first or second member.

  Furthermore, the hinge device of the present invention is applicable not only to mobile phones, but also to portable computers such as laptops, handhelds, PDAs, PocketPCs, and Palms, portable devices such as portable game machines and cosmetic compacts. can do. It can also be applied to the connecting portion between the toilet seat and the toilet lid.

  This specification is based on Japanese Patent Application No. 2007-218117 of an application on August 24, 2007. All this content is included here.

Claims (7)

A chevron cam member that rotates with one of the first member or the second member and has a chevron-shaped cam surface including the top, and a cam surface of the chevron cam member that rotates with the other of the first member or the second member. An abutment member having a top abutting on the hinge member, wherein the second member can be opened and closed with respect to the first member.
One of the chevron cam member or the abutting member is molded of resin, and at least the top portion is made of a material having a hardness higher than that of the resin.
The other of the chevron cam member or the abutting member is made of a material having at least the top portion having a hardness higher than that of the resin,
A hinge device in which the top of the contact member climbs over the top of the cam surface of the angle cam member by opening and closing the second member relative to the first member.   2. The hinge device according to claim 1, wherein each of the angle cam member and the contact member is formed of a resin and at least a top portion thereof is made of a material having a hardness higher than that of the resin.   The top of the chevron cam member is made of a rolling element made of a material having a hardness higher than that of resin, and is rotatably embedded in a cam surface molded by the resin of the chevron cam member. 2. The hinge device according to 2. The contact member has a mountain-shaped cam surface including a top portion;
4. A top portion of the contact member is made of a rolling element made of a material having a hardness higher than that of resin, and is rotatably embedded in a cam surface molded from the resin of the contact member. The hinge apparatus in any one of. The contact member has a mountain-shaped cam surface including a top portion;
When the top of the contact member climbs over the top of the angle cam member, the top of the contact member and the top of the angle cam member contact each other,
Before or after the top of the contact member climbs over the top of the chevron cam member, the resin cam surface of the contact member and the resin cam surface of the chevron cam member are in contact with each other. The hinge device according to claim 2. The contact member has a mountain-shaped cam surface including a top portion;
The top part of the contact member and the cam surface are made of a material having a hardness higher than that of the resin,
2. The hinge device according to claim 1, wherein the top of the chevron cam member slides while contacting the top of the contact member and the cam surface by opening and closing the second member with respect to the first member. . The hinge device further includes a cylindrical case made of a material having a hardness higher than that of the resin and accommodating the angle cam member.
A portion of the chevron cam member that is in contact with the cylindrical case is molded of resin,
The chevron cam member can slide in the direction of the cylindrical case axis and cannot rotate around the axis.
The hinge device according to claim 1, wherein the abutting member can rotate around the axis and cannot slide in the direction of the axis.

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