Hinge device

Abstract

To provide a hinge device capable of preventing unintended retraction of a pivot shaft without complicating installation work of a door.SOLUTION: In a hinge device including a base plate 13, a cylindrical body 14 erected on the back side of the base plate 13, a pivot shaft 11 fitted in the inner peripheral surface of the cylindrical body 14, and moving means for moving the tip of the pivot shaft 11 in a protruding / retracting direction relative to the surface of the base plate 13 by operation, the pivot shaft 11 being attached to either one of a door and a door frame, and the tip of the pivot shaft protruding from the base plate 13 by operating the moving means being fitted into a pivot hole 102 provided in the other of the door and the door frame, a C-shaped spring 17 that applies resistance to the pivot shaft 11 moving in the retracting direction from the protruding position is installed in an outer circumferential groove 11c formed on the outer circumferential surface of the pivot shaft 11.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a hinge device that is attached to the top of a door or to the top frame of a door frame, for rotatably mounting the door relative to the door frame. [Background technology]

[0002] This type of hinge device is configured with a pivot shaft that can retract in order to make it easier to install the door. When installing the door, the pivot shaft is retracted in advance, and after aligning the door and the door frame, the pivot shaft is extended and inserted into the pivot hole.

[0003] In addition, some devices are designed to prevent the protruding pivot shaft from retracting unintentionally.

[0004] For example, the conventional hinge device disclosed in the following Patent Document 1 is configured such that a lever is swung around a horizontal axis by operating an operating screw, causing a pivot shaft with which the tip of the lever engages to protrude from a base plate. Also, to prevent the protruding pivot shaft from retracting unintentionally, a stopper screw is provided as a retraction prevention function to regulate the lever swung in the direction in which the pivot shaft protrudes from swinging in the opposite direction. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2003-193734 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, with the above hinge device, when installing the door, it is necessary to operate the stopper screw in addition to operating the operating screw, which makes the door installation work complicated.

[0007] The present invention has been made in consideration of the existence of the above-mentioned problems, and its object is to provide a hinge device that can prevent unintentional retraction of the pivot shaft without complicating the door installation work. [Means for solving the problem]

[0008] The hinge device of the present invention is a hinge device which is attached to either a door or a door frame and comprises a base plate, a cylinder erected on the back side of the base plate, a pivot shaft which fits into the inner peripheral surface of the cylinder, and moving means which is operated to move the tip of the pivot shaft in a protruding or retracting direction relative to the surface of the base plate, and wherein the tip of the pivot shaft which protrudes from the base plate by operating the moving means fits into a pivot hole provided in the other of the door or the door frame, and is characterized in that it also comprises resistance applying means which applies resistance to the pivot shaft moving in the retracting direction from the protruding position.

[0009] In the hinge device of the present invention, the resistance applying means can include a recess formed on either the outer circumferential surface of the pivot shaft or the inner circumferential surface of the cylindrical body that face each other, and an elastic member installed in the recess and pressing the other of the outer circumferential surface of the pivot shaft or the inner circumferential surface of the cylindrical body.

[0010] Furthermore, in the hinge device according to the present invention, the recess may be an outer circumferential groove or an inner circumferential groove, and the resistance applying means may be a C-shaped spring.

[0011] In addition, in the hinge device of the present invention, the resistance applying means can include a through hole formed by penetrating the outer periphery of the cylindrical body in the inward and outward direction, and a pressing member that presses the outer periphery of the pivot shaft from the outer periphery side of the cylindrical body through the through hole.

[0012] Furthermore, in the hinge device of the present invention, the resistance applying means can be a hook groove recessed into the inner peripheral surface of the cylinder facing the base end of the outer peripheral surface of the pivot shaft when it is in the protruding position, or into the outer peripheral surface of the pivot shaft facing the end of the inner peripheral surface of the cylinder on the base plate side when the pivot shaft is in the protruding position. Effect of the Invention

[0013] According to the present invention, it is possible to provide a hinge device capable of preventing unintended retraction of a pivot shaft without complicating the installation work of a door. [Brief description of the drawings]

[0014] [Figure 1] 1 is a diagram showing a state in which a hinge device according to a first embodiment of the present invention is attached to a door. [Diagram 2] 5A and 5B are diagrams illustrating a state in which a pivot shaft of the hinge device protrudes. [Diagram 3] 4 is a diagram showing a pivot shaft of the hinge device in a retracted state. FIG. [Figure 4] FIG. 3 is an enlarged view of part A in FIG. 2. [Diagram 5] 5A to 5C are diagrams illustrating an elastic member included in the hinge device. [Figure 6] 13A and 13B are diagrams illustrating a pivot shaft protruding state of a hinge device according to a second embodiment of the present invention. [Figure 7] FIG. 7 is an enlarged view of part B in FIG. [Figure 8] 11A and 11B are views of a hinge device according to a third embodiment of the present invention, where (a) is an enlarged view of a position corresponding to part A in FIG. 2, and (b) is a view viewed from CC in (a). [Figure 9] FIG. 13 is a view showing a main part of a hinge device according to a fourth embodiment of the present invention in a pivot shaft protruding state. [Figure 10] FIG. 10 is a cross-sectional view taken along the line DD in FIG. [Figure 11] 5A and 5B are diagrams showing an elastic member included in the hinge device, in which (a) is a plan view and (b) is a side view. [Figure 12] FIG. 13 is a view showing a main part of a hinge device according to a fifth embodiment of the present invention in a pivot shaft protruding state. [Figure 13] FIG. 13 is a view showing a main part of a hinge device according to a sixth embodiment of the present invention in a pivot shaft protruding state. [Figure 14]13A and 13B are diagrams illustrating a pivot shaft protruding state of a hinge device according to a seventh embodiment of the present invention. [Figure 15] FIG. 4 is a bottom view of the hinge device. [Figure 16] 13A and 13B are views showing a pivot shaft protruding state of a hinge device according to an eighth embodiment of the present invention. [Figure 17] FIG. 17 is a cross-sectional view taken along the line DD in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0016] In the following description, unless otherwise specified, the left-right direction on the paper in FIG. 1 is the left-right direction, the up-down direction on the paper is the up-down direction, and the depth direction on the paper is the front-rear direction.

[0017] First, with reference to FIG. 1, an example of a usage state of the hinge device according to this embodiment will be described.

[0018] The hinge device according to this embodiment is used for an opening and closing door that rotates around an axis in the vertical direction. The use state illustrated in FIG. 1 is a case where the hinge device is attached to the door side, and the hinge device 10 according to the first embodiment of the present invention is installed on the upper part of the axis side of the door 101 that opens and closes with respect to the door frame 100 that constitutes an opening. A bearing member having a pivot hole 102 is installed on the upper frame of the door frame 100 that faces the upper part of the axis side of the door 101. The hinge device 10 according to this embodiment is equipped with a pivot shaft 11. The pivot shaft 11 can be moved in the vertical direction by operating an operating screw 12 provided in a moving means described later. When the door 101 is installed, the pivot shaft 11 is retracted downward in advance, and the pivot shaft 11 is projected upward and fitted into the pivot hole 102 while the position of the pivot hole 102 and the pivot shaft 11 are aligned. As a result, the door 101 is installed rotatably with respect to the door frame 100. There is also a hinge portion on the lower side of the door 101, but the description will be omitted. When removing the door 101 from the door frame 100, the protruding pivot shaft 11 is retracted by operating the operating screw 12 of the moving means.

[0019] Next, the hinge device 10 according to the first embodiment of the present invention will be described in detail with reference to Figs. 2 to 5 as reference figures.

[0020] The hinge device 10 includes a plate-shaped base plate 13 for mounting the hinge device 10 to a door or a door frame, a cylinder 14 erected on the underside, which is the back side, of the base plate 13, a pivot shaft 11 fitted to an inner peripheral surface 14a of the cylinder 14 so as to be movable in the vertical direction, a lever 15 having a tip end 15a inserted into an engagement hole 11b formed in the pivot shaft 11 through a circumferentially predetermined width slit 14b formed on the outer peripheral part of the right side of the cylinder 14 and extending in the vertical direction, an operating screw 12 having an engagement part 12a at its lower end that engages with an engaged part 15b formed at the base end of the lever 15 and screwed into a female thread of the base plate 13, and a swing support shaft 16 supporting the lever 15 at a left-right intermediate position of the lever 15 so as to be swingable around an axis extending in the front-rear direction. The base plate 13 is formed with a plurality of screw insertion holes (not shown) for screwing the hinge device 10 to the door or the door frame. The swing support shaft 16 is held by a pair of front and rear holders 13a that protrude downward from the base plate 13. The pair of front and rear holders 13a are fixed to the base plate 13 by welding. A lever 15 is disposed between the pair of front and rear holders 13a. The lever 15 is made of a plate material whose thickness direction is in the front-to-rear direction. The upper end portion 12b of the operating screw 12 has a tool locking shape such as a screwdriver groove or a hexagonal hole for rotating the screw with a hand tool or the like. In this embodiment, the tool locking shape is formed as a flathead screwdriver groove. Moreover, the pivot shaft 11 in this embodiment has a through hole in the center that penetrates vertically for passing a wire through.

[0021] In the hinge device 10 according to this embodiment, the pivot shaft 11 can be moved forward and backward from the upper surface (surface) of the base plate 13 by operating the operating screw 12. That is, when the operating screw 12 is screwed downward, the engaged portion 15b descends together with the engaging portion 12a, and the lever 15 swings clockwise around the swing support shaft 16. As a result, the tip portion 15a of the lever 15 rises, and the pivot shaft 11 engaged with the tip portion 15a of the lever 15 moves upward, and the upper end portion (tip portion) of the pivot shaft 11 protrudes from the upper surface (surface) of the base plate 13. FIG. 2 shows a state in which the pivot shaft 11 is positioned at the maximum protruding position. Also, when the operating screw 12 is screwed upward, the engaged portion 15b rises together with the engaging portion 12a, and the lever 15 swings counterclockwise around the swing support shaft 16. As a result, the tip 15a of the lever 15 descends, causing the pivot shaft 11 engaging with the tip 15a of the lever 15 to move downward, and the upper end (tip) of the pivot shaft 11 retracts into the upper surface (surface) of the base plate 13 (the state shown in FIG. 3). Thus, the moving means for the pivot shaft 11 in this embodiment includes the operating screw 12, the lever 15, and the swing support shaft 16.

[0022] The hinge device has a retraction prevention function for preventing the pivot shaft 11, the upper end (tip) of which protrudes from the upper surface (front surface) of the base plate 13, from unintentionally moving in the retracting direction.

[0023] In the hinge device 10 according to the first embodiment of the present invention, the resistance applying means that applies resistance to the pivot shaft 11 moving in the retracting direction from the protruding position exerts a retraction prevention function.

[0024] As shown in FIG. 4, an outer peripheral groove 11c is formed as a recess on the outer peripheral surface of the lower part (base) of the pivot shaft 11. The outer peripheral groove 11c is located below the engagement hole 11b. The outer peripheral groove 11c is formed at a position facing the inner peripheral surface 14a of the cylindrical body 14 over the entire range of the advancement and retreat of the pivot shaft 11 by the operation screw 12. A C-shaped spring 17 is disposed in the outer peripheral groove 11c as an elastic member (see FIG. 5). The C-shaped spring 17 is manufactured using a spring steel wire as a strand, and the outer diameter of the C-shaped spring 17 in a free state (unloaded state) is set to be larger than the inner diameter of the inner peripheral surface 14a of the cylindrical body 14. Therefore, the outer periphery of the C-shaped spring 17 disposed in the outer peripheral groove 11c elastically presses the inner peripheral surface 14a of the cylindrical body 14. Furthermore, the C-shaped spring 17 installed in the outer circumferential groove 11c is restricted from moving in the up and down direction relative to the pivot shaft 11 by the upper and lower side walls of the outer circumferential groove 11c. With this configuration, when the pivot shaft 11 moves in the up and down direction, frictional resistance is generated between the inner circumferential surface 14a of the cylindrical body 14 and the outer diameter of the C-shaped spring 17. This frictional resistance acts as resistance against the movement of the pivot shaft 11. Therefore, resistance is applied to the pivot shaft 11 moving in the retracted direction from the protruding position.

[0025] In this embodiment, the engaging inner circumferential groove 14c is recessed in the inner circumferential surface 14a of the cylinder 14, which faces the outer circumferential groove 11c at the maximum protruding position of the pivot shaft 11. The vertical width of the engaging inner circumferential groove 14c is set to be larger than the vertical width of the outer circumferential groove 11c. The depth of the engaging inner circumferential groove 14c is set to be smaller than the radius of the wire of the C-shaped spring 17, and is preferably set to be smaller than half the radius. With this configuration, resistance is generated when the C-shaped spring 17 facing the engaging inner circumferential groove 14c overcomes the lower side wall of the engaging inner circumferential groove 14c as the pivot shaft 11 moves in the retracting direction. Therefore, a larger resistance is temporarily applied to the pivot shaft 11 moving in the retracting direction from the protruding position.

[0026] As described above, in this embodiment, the outer peripheral groove 11c, the C-shaped spring 17, and the inner peripheral surface 14a act as resistance applying means. Alternatively, the outer peripheral groove 11c, the C-shaped spring 17, and the engaging inner peripheral groove 14c act as resistance applying means. Therefore, no additional work is required to provide the anti-retraction function when installing the door.

[0027] Next, a hinge device 20 according to a second embodiment of the present invention will be described with reference to Figures 6 and 7. The hinge device 20 according to the second embodiment has the same basic configuration as the hinge device 10 according to the first embodiment, and differs only in the configuration of the resistance applying means. Therefore, the following description will focus on the configuration of the resistance applying means.

[0028] In the hinge device 20 according to the second embodiment, an inner circumferential groove 24c is formed on the inner circumferential surface 14a of the upper part of the cylindrical body 14. The inner circumferential groove 24c is located above the slit 14b. The inner circumferential groove 24c is formed at a position facing the outer circumferential surface 11a of the pivot shaft 11 in the entire range of the forward and backward movement of the pivot shaft 11 by the operation screw 12. A C-shaped spring 27 is disposed in the inner circumferential groove 24c as an elastic member. The C-shaped spring 27 has the same appearance as the C-shaped spring 17 shown in FIG. 5. The C-shaped spring 27 is manufactured using a spring steel wire as a strand, and the inner diameter of the C-shaped spring 27 in a free state (unloaded state) is set to be smaller than the outer diameter of the outer circumferential surface 11a of the pivot shaft 11. Therefore, the inner circumference of the C-shaped spring 27 disposed in the inner circumferential groove 24c elastically presses the outer circumferential surface 11a of the pivot shaft 11. Furthermore, the C-shaped spring 27 installed in the inner circumferential groove 24c is restricted from moving in the up and down direction relative to the cylindrical body 14 by the upper and lower side walls of the inner circumferential groove 24c. With this configuration, when the pivot shaft 11 moves in the up and down direction, frictional resistance is generated between the outer circumferential surface 11a of the pivot shaft 11 and the inner diameter of the C-shaped spring 27. This frictional resistance acts as resistance to the movement of the pivot shaft 11. Therefore, resistance is applied to the pivot shaft 11 moving in the retracted direction from the protruding position.

[0029] In this embodiment, the engaging outer peripheral groove 21c is recessed in the outer peripheral surface 11a of the pivot shaft 11 facing the inner peripheral groove 24c at the maximum protruding position of the pivot shaft 11. The engaging outer peripheral groove 21c is a shallow peripheral groove having a substantially V-shaped cross section with an obtuse angle between two sides. With this configuration, resistance is generated when the C-shaped spring 27 engaged in the engaging outer peripheral groove 21c leaves the engaging outer peripheral groove 21c as the pivot shaft 11 moves in the retracting direction. Therefore, the resistance applied to the pivot shaft 11 moving in the retracting direction from the maximum protruding position temporarily increases.

[0030] In addition, the engaging outer peripheral grooves 21d, 21e having the same shape as the engaging outer peripheral groove 21c are recessed at a predetermined interval above the engaging outer peripheral groove 21c. By providing the engaging outer peripheral grooves 21d, 21e, the C-shaped spring 27 that has left the engaging outer peripheral groove 21c as the pivot shaft 11 moves in the retracting direction repeats engagement and disengagement with the engaging outer peripheral grooves 21d, 21e as the pivot shaft 11 moves further in the retracting direction. Therefore, there are a total of three positions where the resistance applied to the pivot shaft 11 moving in the retracting direction from the protruding position is temporarily large. Note that the vertical position of the engaging outer peripheral groove 21e is set so that the upper end of the pivot shaft 11 fits into the pivot hole 102 even when the C-shaped spring 27 is engaged in the uppermost engaging outer peripheral groove 21e.

[0031] As described above, in this embodiment, the inner peripheral groove 24c, the C-shaped spring 27, and the outer peripheral surface 11a act as the resistance applying means. Alternatively, the inner peripheral groove 24c, the C-shaped spring 27, and the engaging outer peripheral grooves 21c, 21d, and 21e act as the resistance applying means. Therefore, no additional work is required to achieve the anti-entry function when installing the door.

[0032] Next, a hinge device 30 according to a third embodiment of the present invention will be described with reference to Fig. 8. The hinge device 30 according to the third embodiment has the same basic configuration as the hinge device 10 according to the first embodiment, and differs only in the configuration of the resistance applying means. Therefore, the following description will focus on the configuration of the resistance applying means.

[0033] In the hinge device 30 according to the third embodiment, a groove 31c of a predetermined width in the circumferential direction is recessed in the outer peripheral surface 11a of the lower end of the pivot shaft 11, extending upward from the lower end. A leaf spring member 37 is installed in the groove 31c as an elastic member. The leaf spring member 37 is made of a leaf spring material and has a flat portion 37a and a bulging portion 37b that is connected to the lower side of the flat portion and bulges toward the inner peripheral surface 14a of the cylindrical body 14. The leaf spring member 37 is fixed to the bottom surface of the groove 31c by a rivet 38. The width of the leaf spring member 37 is slightly smaller than the width of the groove 31c. The outer surface of the bulging portion 37b elastically presses the inner peripheral surface 14a of the cylindrical body 14. With this configuration, frictional resistance is generated between the inner peripheral surface 14a of the cylindrical body 14 and the bulging portion 37b of the leaf spring member 37 when the pivot shaft 11 moves in the vertical direction. This frictional resistance acts as resistance against the movement of the pivot shaft 11. Therefore, resistance is applied to the pivot shaft 11 moving in the retracting direction from the protruding position.

[0034] As described above, in this embodiment, the groove 31c and the leaf spring member 37 act as resistance applying means. Therefore, no additional work is required to exert the anti-entry function when installing the door.

[0035] Next, a hinge device 40 according to a fourth embodiment of the present invention will be described with reference to Figures 9 to 11. Note that the hinge device 40 according to the fourth embodiment has the same basic configuration as the hinge device 10 according to the first embodiment, and differs only in the configuration of the resistance applying means, and therefore the following description will focus on the configuration of the resistance applying means.

[0036] In the hinge device 40 according to the fourth embodiment of the present invention, a mounting groove 14e is formed as a circumferential groove in the vicinity of the lower side of the base plate 13 on the outer circumferential surface 14d of the cylindrical body 14. A through hole 14f is formed at the bottom of the mounting groove 14e on the side opposite to the lever 15, penetrating the outer circumferential portion of the cylindrical body 14 in the inward and outward directions. The through hole 14f is formed as a round hole having a left-right axis. A leaf spring member 47 with a pressing protrusion as an elastic member is mounted in the mounting groove 14e by elastic support. As shown in Figs. 11(a) and 11(b), the leaf spring member 47 with a pressing protrusion has a main portion 47a made of a C-shaped leaf spring material for elastic support, and a pressing protrusion 47b protruding inward from the main portion 47a at the circumferential intermediate portion of the main portion 47a. In the installed state, the pressing protrusion 47b elastically presses the outer circumferential surface 11a of the pivot shaft 11 through the through hole 14f. With this configuration, when the pivot shaft 11 moves in the up-down direction, frictional resistance is generated between the outer peripheral surface 11a of the pivot shaft 11 and the pressing protrusion 47b of the leaf spring member 47 with pressing protrusions. This frictional resistance acts as resistance against the movement of the pivot shaft 11. Therefore, resistance is applied to the pivot shaft 11 moving in the retracting direction from the protruding position.

[0037] In this embodiment, an engaging outer circumferential groove 41c is recessed in the outer circumferential surface 11a of the pivot shaft 11 facing the pressing protrusion 47b at the maximum protruding position of the pivot shaft 11. The engaging outer circumferential groove 41c is a shallow circumferential groove having a circular arc shape in cross section. The tip of the pressing protrusion 47b engages with the engaging outer circumferential groove 41c. With this configuration, resistance is generated when the tip of the pressing protrusion 47b engaged with the engaging outer circumferential groove 41c leaves the engaging outer circumferential groove 41c as the pivot shaft 11 moves in the retracting direction. Therefore, a larger resistance is temporarily applied to the pivot shaft 11 moving in the retracting direction from the protruding position.

[0038] In addition, the engaging outer peripheral groove 41c is also provided with an engaging outer peripheral groove 41d and an engaging outer peripheral groove 41e having the same shape as the engaging outer peripheral groove 41c at a predetermined interval above the engaging outer peripheral groove 41c. By providing the engaging outer peripheral grooves 41d and 41e, the pressing protrusion 47b that has left the engaging outer peripheral groove 41c as the pivot shaft 11 moves in the retracting direction repeats engagement and disengagement with the engaging outer peripheral grooves 41d and 41e as the pivot shaft 11 moves further in the retracting direction. Therefore, there are a total of three positions where the resistance applied to the pivot shaft 11 moving in the retracting direction from the protruding position is temporarily large. Note that the vertical position of the engaging outer peripheral groove 41e is set so that the upper end of the pivot shaft 11 fits into the pivot hole 102 even when the tip of the pressing protrusion 47b is engaged with the uppermost engaging outer peripheral groove 41e.

[0039] As described above, in this embodiment, the installation groove 14e, the through hole 14f, and the leaf spring member 47 with pressing protrusions act as resistance applying means. Alternatively, the installation groove 14e, the through hole 14f, the leaf spring member 47 with pressing protrusions, and the engaging outer peripheral grooves 41c, 41d, and 41e act as resistance applying means. Therefore, no additional work is required to exert the anti-entry function when installing the door.

[0040] Next, a hinge device 50 according to a fifth embodiment of the present invention will be described with reference to Fig. 12. Note that the hinge device 50 according to the fifth embodiment has the same basic configuration as the hinge device 10 according to the first embodiment, and differs only in the configuration of the resistance applying means, and therefore the following description will focus on the configuration of the resistance applying means.

[0041] In the hinge device 50 according to the fifth embodiment of the present invention, a plurality of hook outer peripheral grooves 51c are vertically arranged and recessed in the outer peripheral surface 11a of the pivot shaft 11, which faces the upper end 14g, which is the end of the inner peripheral surface 14a of the cylindrical body 14 on the side of the base plate 13, at the maximum protruding position of the pivot shaft 11, and in the range above it. In this embodiment, six hook outer peripheral grooves 51c are recessed. When the pivot shaft 11 moves in the retracting direction from the maximum protruding position, the hook outer peripheral grooves 51c are caught by the upper end 14g of the inner peripheral surface 14a of the cylindrical body 14, and become a resistance. To be more specific, a fitting gap is provided between the outer peripheral surface 11a of the pivot shaft 11 and the inner peripheral surface 14a of the cylindrical body 14. Therefore, the pivot shaft 11 supporting the door 100 is inclined by the fitting gap. That is, the outer peripheral surface 11a of the pivot shaft 11 is inclined by the fitting gap with respect to the inner peripheral surface 14a of the cylindrical body 14. Due to this inclination, when the pivot shaft 11 is retracted, a circumferential portion of the outer circumferential latch groove 51c (the left side area in FIG. 12) gets caught on the upper end 14g of the inner circumferential surface 14a of the cylindrical body 14, providing resistance to the pivot shaft 11 moving in the retracting direction. Note that in FIG. 12, the fitting gap and inclination are exaggerated for ease of understanding.

[0042] In addition, since there are six hook circumferential grooves 51c, this resistance is applied to the pivot shaft 11 at six positions as it moves from the protruding position to the retracting position. Note that the vertical positions of the hook circumferential grooves 51c are set so that even at the position where this resistance is applied last, i.e., the position where the uppermost hook circumferential groove 51c faces the upper end 14g of the inner circumferential surface 14a of the cylindrical body 14, the upper end of the pivot shaft 11 fits into the pivot hole 102.

[0043] As described above, in this embodiment, the upper end 14g and the outer peripheral hook groove 51c act as resistance applying means, and therefore no additional work is required to provide the anti-retraction function when the door is installed.

[0044] Next, a hinge device 60 according to a sixth embodiment of the present invention will be described with reference to Fig. 13. Note that the hinge device 60 according to the sixth embodiment has the same basic configuration as the hinge device 10 according to the first embodiment, and differs only in the configuration of the resistance applying means, and therefore the following description will focus on the configuration of the resistance applying means.

[0045] In the hinge device 60 according to the sixth embodiment of the present invention, a plurality of hook inner peripheral grooves 61c are vertically arranged and recessed in the inner peripheral surface 14a of the cylinder 14 facing the lower end 11d, which is the base end of the outer peripheral surface 11a of the pivot shaft 11 located at the maximum protruding position, and in the range below the position. In this embodiment, six hook inner peripheral grooves 61c are recessed. When the pivot shaft 11 moves from the maximum protruding position in the retracting direction, the lower end 11d of the outer peripheral surface 11a of the pivot shaft 11 gets caught in the hook inner peripheral groove 61c, which becomes a resistance. To be more specific, a fitting gap is provided between the outer peripheral surface 11a of the pivot shaft 11 and the inner peripheral surface 14a of the cylinder 14. As a result, the pivot shaft 11, to which the weight of the door 100 is applied as a moment, is inclined by the fitting gap. That is, the outer peripheral surface 11a of the pivot shaft 11 is inclined relative to the inner peripheral surface 14a of the cylindrical body 14 by the amount of the fitting gap (see FIG. 12). Due to this inclination, when the pivot shaft 11 retracts, the lower end 11d of the outer peripheral surface 11a of the pivot shaft 11 gets caught in a circumferential part of the inner peripheral hook groove 61c (the left side area in FIG. 13), providing resistance to the pivot shaft 11 moving in the retracting direction.

[0046] Furthermore, since there are six hook inner circumferential grooves 61c, this resistance is applied to the pivot shaft 11 at six positions as it moves in the retracting direction from the protruding position. The vertical positions of the hook inner circumferential grooves 61c are set so that even at the position where this resistance is applied last, i.e., the position where the lower end 11d of the outer circumferential surface 11a of the pivot shaft 11 faces the lowest hook inner circumferential groove 61c, the upper end of the pivot shaft 11 fits into the pivot hole 102.

[0047] As described above, in this embodiment, the lower end 11d and the inner peripheral hook groove 61c act as resistance applying means, and therefore no additional work is required to provide the anti-retraction function when the door is installed.

[0048] Next, a hinge device 70 according to a seventh embodiment of the present invention will be described with reference to Figures 14 and 15. Note that the hinge device 70 according to the seventh embodiment has the same basic configuration as the hinge device 10 according to the first embodiment, and differs only in the configuration of the resistance applying means, and therefore the following description will focus on the configuration of the resistance applying means.

[0049] In the above-described embodiment, the retraction prevention function is performed by the resistance applying means that applies resistance to the pivot shaft 11 moving in the retracting direction from the protruding position, whereas in the hinge device 70 according to the seventh embodiment of the present invention, the retraction prevention function is performed by the resistance applying means that applies resistance to the lever 15 that swings in order for the pivot shaft 11 to move in the retracting direction from the protruding position.

[0050] A hinge device 70 according to a seventh embodiment of the present invention includes a torsion coil spring 71 as a spring member for biasing the lever 15 in the swing direction in which the pivot shaft 11 projects. The torsion coil spring 71 is manufactured using spring steel wire as a wire. The torsion coil spring 71 has coil portions 71a whose coil inner diameters are supported by the extended shaft portions 16a connected to both sides of the swing support shaft 16 in the front-rear direction, straight portions 71b that extend from the outer sides of both coil portions 71a in the front-rear direction to the back surface of the base plate 13 and whose tip portions press and urge the back surface of the base plate 13 upward at a position to the right of the swing support shaft 16, and a connecting portion 71c that extends from the inner sides of both coil portions 71 in the front-rear direction facing the lever 15 to connect both coil portions 71a to each other and also press and urge the lower edge portion 15c of the lever 15 upward at a position to the left of the swing support shaft 16. A stop ring 72 is provided at the end of each of the extending shaft portions 16a to prevent the coil portion 71a from slipping outward in the front-rear direction from the extending shaft portion 16a. The coil spring 71 always biases the lever 15 in the swing direction in which the pivot shaft 11 protrudes, regardless of the swing position of the lever 15. Therefore, the coil spring 71 applies resistance to the lever 15 swinging in order to move the pivot shaft 11 in the retracted direction from the protruding position.

[0051] As described above, in this embodiment, the coil spring 71 functions as a resistance applying means, and therefore no additional work is required to provide the anti-entry function when the door is installed.

[0052] 16 and 17 are additional reference drawings, and a hinge device 80 according to an eighth embodiment of the present invention will be described below. Note that the hinge device 80 according to the eighth embodiment has the same basic configuration as the hinge device 10 according to the first embodiment, and differs only in the configuration of the resistance applying means, and therefore the following description will focus on the configuration of the resistance applying means.

[0053] Furthermore, in the hinge device 80 according to the eighth embodiment of the present invention, similar to the hinge device 70 according to the seventh embodiment, the resistance applying means that applies resistance to the lever 15 that swings as the pivot shaft 11 moves from the protruding position in the retracting direction constitutes a retraction prevention function.

[0054] A hinge device 80 according to an eighth embodiment of the present invention includes a lever leaf spring member 81 as a spring member that biases the lever 15 in the swinging direction in which the pivot shaft 11 protrudes and applies resistance to the swinging lever 15. The lever leaf spring member 81 is made of a thin leaf spring material and is attached to the back surface of the base plate 13. The lever leaf spring member 81 has a substrate 81a for mounting to the back surface of the base plate 13, a pair of front and rear arms 81b fixed to the lower surface of the substrate 81a and extending downward from the lower surface of the substrate 81a, and a pair of front and rear protrusions 81c protruding from the arms 81b in a direction approaching each other at the lower part of the pair of front and rear arms 81b. The distance between the pair of front and rear protrusions 81c is set to be smaller than the plate thickness (thickness in the front and rear direction) of the lever 15. The protrusions 81c have inclined surfaces 81d that are inclined downward from the arms 81b in a direction approaching each other. The lever leaf spring component 81 is screwed to the back surface of the base plate 13 by two mounting screws 82 that pass through the base plate 81a. The lever 15 is located between both arms 81b. An engagement lower edge 15d is formed in a range of the lower edge 15c of the lever 15 that corresponds to the lever leaf spring component 81, the inclination angle of which with respect to the left-right direction is set smaller than that of the lower edge 15c.

[0055] 16 and 17, the lever 15 and the lever leaf spring member 81 are shown by solid lines in a state where the pivot shaft 11 is positioned at the maximum protruding position. In this state, as shown in Fig. 17, the engaging lower edge 15d of the lever 15 is not in contact with the inclined surface 81d of the convex portion 81c of the lever leaf spring member 81. When the engaging lower edge 15d of the lever 15 swings downward from this solid line state in a direction in which the pivot shaft 11 is retracted, as shown by imaginary lines in the figures, the front and rear ridges of the engaging lower edge 15d come into contact with the inclined surface 81d of the lever leaf spring member 81, pushing the pair of front and rear arms 81b outward in the front and rear direction, and as it swings further downward, the lever 15 reaches between the pair of front and rear convex portions 81c. When the front and rear ridges of the lower edge 15d for engagement are in contact with the inclined surface 81d of the leaf spring member 81 for lever, the elastic reaction force received from the inclined surface 81d urges the lower edge 15d for engagement upward. That is, the leaf spring member 81 for lever urges the lever 15 in the swinging direction in which the pivot shaft 11 protrudes. When the lever 15 is positioned between the pair of front and rear protrusions 81c, the pair of front and rear protrusions 81c elastically press the front and rear surfaces of the lever 15 so as to sandwich them, providing frictional resistance to the swinging lever 15. Therefore, the leaf spring member 81 for lever provides resistance to the swinging lever 15 as the pivot shaft 11 moves from the protruding position in the retracting direction.

[0056] As described above, in this embodiment, the lever leaf spring component 81 functions as a resistance applying means. Therefore, no additional work is required to provide the anti-retraction function when the door is installed.

[0057] Although the embodiment of the present invention has been described above, the technical scope of the present invention is not limited to the scope described in the above embodiment. Various modifications and improvements can be made to the above embodiment.

[0058] For example, in the above-described embodiment, the pivot shaft 11 has a through hole that passes vertically through the center for passing wires therethrough, but it may also be configured without a through hole.

[0059] Also, for example, in the above-described embodiment, the hinge device is installed at the top of the door 101 and the pivot hole 102 is installed in the upper frame of the door frame 100, but the hinge device may be installed in the upper frame of the door frame 100 and the pivot hole 102 may be installed at the top of the door 101.

[0060] Furthermore, for example, the above-described embodiments may be implemented in combination. [Explanation of symbols]

[0061] 10: Hinge device 11: Pivot axis 11a: Outer surface 11b: Engagement hole 11c: Outer groove 11d: Bottom edge 12: Operating screw 12a: Engagement part 12b: Upper end 13: Base plate 13a: Holder 14: Cylinder 14a: Inner surface 14b: Slit 14c: Engagement inner circumferential groove 14d: Outer surface 14e: Installation groove 14f: Through hole 14g:Top end 15: Lever 15a:Tip 15b: Engaged part 15c: Lower edge 15d: Lower edge for engagement 16: Swinging shaft 16a: Extended shaft portion 16a 17: C-shaped spring 20: Hinge device 21c: Engagement outer groove 21d: Engagement outer circumferential groove 21e: Engagement outer circumferential groove 24c: Inner groove 27: C-shaped spring 30: Hinge device 31c: Groove 37: Leaf spring parts 37a: Flat part 37b:bulge 38: Tack 40: Hinge device 41c: Engagement outer groove 41d: Engagement outer circumferential groove 41e: Engagement outer groove 47: Leaf spring member with pressing protrusion 47a: Main part 47b: Pressing protrusion 50: Hinge device 51c:Latch outer circumferential groove 60: Hinge device 61c:Latching outer circumferential groove 70: Hinge device 71: Torsion coil spring 71a: Coil section 71b: Straight section 71c:Connection part 72: Retaining ring 80: Hinge device 81: Leaf spring parts for levers 81a: Substrate 81b: Arm 81c: Convex 81d: Inclined surface 82: Mounting screw 100: Door frame 101: Door 102: Pivot hole

Claims

1. A hinge device comprising a base plate, a cylinder erected on the back side of the base plate, a pivot shaft fitted to the inner peripheral surface of the cylinder, and a moving means for moving a tip of the pivot shaft in a projecting / retracting direction relative to the surface of the base plate by operation, the hinge device being attached to either a door or a door frame, the tip of the pivot shaft projecting from the base plate by operation of the moving means being fitted into a pivot hole provided in the other of the door or the door frame, A hinge device comprising: a resistance applying means for applying resistance to a pivot shaft moving in a retracting direction from a protruding position.

2. 2. The hinge device according to claim 1, wherein the resistance applying means comprises a recess formed in one of the outer circumferential surface of the pivot shaft and the inner circumferential surface of the cylindrical body, which face each other, and an elastic member installed in the recess and pressing the other of the outer circumferential surface of the pivot shaft and the inner circumferential surface of the cylindrical body.

3. 3. The hinge device according to claim 2, wherein the recess is an outer circumferential groove or an inner circumferential groove, and the resistance applying means is a C-shaped spring.

4. 2. The hinge device according to claim 1, wherein the resistance applying means comprises a through hole formed penetrating an outer periphery of the cylindrical body in an inward / outward direction, and a pressing member that presses the outer periphery of the pivot shaft from the outer periphery side of the cylindrical body through the through hole.

5. 2. The hinge device according to claim 1, wherein the resistance applying means comprises a hook groove recessed into an inner peripheral surface of the cylinder facing a base end of an outer peripheral surface of the pivot shaft when the pivot shaft is in the protruding position, or into an outer peripheral surface of the pivot shaft facing an end of the inner peripheral surface of the cylinder on the base plate side when the pivot shaft is in the protruding position.

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