Pivot hinge

Abstract

To provide a pivot hinge which does not require time and effort for attachment and detachment as compared with a conventional pivot hinge, and can reduce forgetting to fasten a screw and a risk accompanying the forgetting to fasten the screw.SOLUTION: The pivot hinge of the present application includes a casing, a hollow pivot shaft disposed in the casing, a movable body disposed in the pivot shaft, an elastic body biasing the movable body, and a locking body disposed in a locking body accommodating portion formed in a circumferential surface of the pivot shaft, wherein a locking concave portion to which the locking body can be locked is provided on an inner peripheral surface of the casing, and the pivot shaft is configured not to be movable in a state where the locking body is locked to the locking concave portion and to be movable in a state where the locking body is unlocked from the locking concave portion. The locking body can be disengaged from the locking recess by the movement of the movable body, and the pivot shaft can be made movable by the locking body being disengaged from the locking recess.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pivot hinge for use in hanging a door. [Background technology]

[0002] Pivot hinges are sometimes used to hang hinged doors (for example, see Patent Documents 1 and 2). One type of pivot hinge is attached to the door by screws. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-239609 [Patent Document 2] Patent No. 3830845 Summary of the Invention [Problem to be solved by the invention]

[0004] Pivot hinges require screws to be attached to the door, which is time-consuming because the screws must be tightened every time they are installed or removed. Also, workers may forget to tighten the screws due to carelessness, which can lead to the door accidentally falling off.

[0005] The present invention has been made in consideration of the above circumstances, and the problem to be solved is to provide a pivot hinge that is easier to install and remove than conventional pivot hinges and that reduces the risk of forgetting to tighten screws or the associated risks of not tightening them. [Means for solving the problem]

[0006] The pivot hinge of the present application comprises a casing, a hollow pivot shaft arranged within the casing, a movable body arranged within the pivot shaft, an elastic body that biases the movable body, and a locking body arranged within a locking body accommodating portion formed on the circumferential surface of the pivot shaft, and a locking recess in which the locking body can be engaged is provided on the inner circumferential surface of the casing, and the pivot shaft is configured so that it cannot move when the locking body is engaged with the locking recess, but can move when the locking body is disengaged from the locking recess. [Effects of the Invention]

[0007] The pivot hinge of the present application does not require screw fastening, so it is easier to install and remove than conventional pivot hinges that require screw fastening, and it reduces the risk of forgetting to tighten screws or the associated risks of forgetting to tighten screws. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an exploded perspective view showing an example of a pivot hinge according to the present application; [Figure 2] An explanatory diagram of the pivot hinge in Figure 1 attached to the top of a door. [Figure 3] An explanatory diagram of a door with the pivot hinge in Figure 1 attached to the top of the door. [Figure 4] 2(a) to 2(c) are explanatory diagrams of the operation of the pivot hinge in Fig. 1. [Figure 5] FIG. 10 is an exploded perspective view showing another example of the pivot hinge of the present application. [Figure 6] 6(a) to 6(c) are explanatory diagrams of the operation of the pivot hinge in FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Embodiment 1) An example of an embodiment of a pivot hinge 100 of the present application will be described with reference to the drawings. As an example, the pivot hinge 100 shown in Fig. 1 includes a frame-side member 10, a door-side member 20, a casing 30, a pivot shaft 40, a locking body 50, a movable body 60, an elastic body 70, and a cover 80.

[0010] The frame side member 10 is a member that is attached to a door frame F that constitutes a doorway E (FIG. 2). The frame side member 10 in this embodiment is made of metal and includes a fixing portion 11 that is fixed to the inner surface of the door frame F, and a holding portion 12 that is folded back vertically or approximately vertically from the top of the fixing portion 11.

[0011] The holding part 12 has a protruding part 12a that protrudes toward the front in the depth direction of the door frame F when the fixing part 11 is fixed to the door frame F (Fig. 2). The protruding part 12a has a through hole (hereinafter referred to as "holding hole") 12c that holds the tip end side of the pivot shaft 40 and the movable body 60. The frame side member 10 can be fixed to the door frame F with screws or the like.

[0012] The door-side member 20 is a member attached to a door D (FIG. 2) that opens and closes an entrance E. Like the frame-side member 10, the door-side member 20 is also made of metal, and includes a door fixing portion 21 that is fixed to the upper end surface of the door D, and a receiving portion 22 that protrudes forward beyond the front surface of the door D. The receiving portion 22 is provided with a through-hole (hereinafter referred to as a "receiving hole") 23 into which the upper side of the casing 30 (the fitting portion 31b of the main body sleeve 31, which will be described later) fits.

[0013] The casing 30 is a container that houses the pivot shaft 40, the movable body 60, the elastic body 70, and the locking body 50, and includes a main body sleeve 31 and a lid member 32 that can be attached to and detached from the main body sleeve 31. The main body sleeve 31 is a hollow member that includes a cylindrical body portion 31a, a fitting portion 31b formed on the upper end side of the body portion 31a, and a threaded portion 31c formed on the lower end side of the body portion 31a. A male screw is provided on the outer periphery of the threaded portion 31c.

[0014] A space is provided inside the main sleeve 31 to accommodate the pivot shaft 40, the movable body 60, the elastic body 70, and the locking body 50. An upper opening 31d through which the pivot shaft 40 and the movable body 60 appear and disappear is provided at the top of the main sleeve 31, and a lower opening 31e (FIGS. 4(a) to 4(c)) for accommodating components such as the pivot shaft 40 is provided at the bottom.

[0015] In this embodiment, the main body sleeve 31 has an inner diameter (hereinafter referred to as the "first inner diameter") of the body portion 31a and the threaded portion 31c that is larger than the inner diameter (hereinafter referred to as the "second inner diameter") of the fitting portion 31b, so that the space inside the body portion 31a and the threaded portion 31c is larger than the space inside the fitting portion 31b.

[0016] The inner peripheral surface of the trunk portion 31a of the main body sleeve 31 is provided with locking recesses 31f (FIGS. 4(a) to 4(c)) into which locking bodies 50, which will be described later, are locked. In this embodiment in which a sphere is used as the locking body 50, the shape of the locking recesses 31f is semispherical so that about half of the sphere can be accommodated, but the shape of the locking recesses 31f can be any suitable shape depending on the shape of the locking body 50. The number of locking recesses 31f can also be any suitable number depending on the number of locking bodies 50.

[0017] The lid member 32 is a member that closes the lower opening 31e of the main body sleeve 31. The lid member 32 in this embodiment is a disk-shaped member with a bottom that opens upward, and its inner peripheral surface is provided with a female thread portion 32a that can be threaded onto the male thread of the threaded portion 31c of the main body sleeve 31. A spring bearing second recess 32b that fits the lower end side of the elastic body 70 is provided in the center of the bottom of the lid member 32.

[0018] The pivot shaft 40 is a member that passes through the upper opening 31d of the main body sleeve 31 and fits into the retaining hole 12c of the frame side member 10. The pivot shaft 40 is disposed inside the main body sleeve 31 with a slight clearance between it and the inner peripheral surface of the main body sleeve 31. The pivot shaft 40 becomes movable when the locking body 50 is disengaged from the locking recess 31f due to movement of the movable body 60.

[0019] The pivot shaft 40 of this embodiment includes a cylindrical large diameter portion 41 and a cylindrical small diameter portion 42 that is provided above the large diameter portion 41 and has a smaller diameter than the large diameter portion 41. The large diameter portion 41 has an outer diameter that prevents it from slipping out of the upper opening 31d of the main body sleeve 31, while the small diameter portion 42 has an outer diameter that allows it to protrude from and retract into the upper opening 31d of the main body sleeve 31.

[0020] Therefore, even if the small diameter portion 42 protrudes outward from the upper opening 31d of the main sleeve 31, the large diameter portion 41 does not protrude outward from the upper opening 31d of the main sleeve 31, and the pivot shaft 40 remains within the main sleeve 31.

[0021] The large diameter portion 41 is provided with one or more (two in this embodiment) locking body accommodating portions 41a that open onto the outer circumferential surface. The locking body accommodating portion 41a is a portion that accommodates a locking body 50, which will be described later. The diameter of the opening of the locking body accommodating portion 41a is set to a size that prevents the locking body 50 accommodated in the locking body accommodating portion 41a from falling out, i.e., smaller than the maximum diameter of the locking body 50.

[0022] In addition, since the locking body 50 accommodated in the locking body accommodating portion 41a will not fall out once it is contained within the main sleeve 31, the diameter of the opening of the locking body accommodating portion 41a may be larger than the maximum diameter of the locking body 50.

[0023] The multiple locking body accommodating sections 41a provided in the large diameter section 41 may be connected inside the large diameter section 41 or may be independent of each other, but in either case, it is necessary to ensure that the depth is sufficient to completely accommodate the locking body 50 (to be able to retreat to a position where it does not protrude outward beyond the outer surface of the large diameter section 41).

[0024] The locking bodies 50 are members that fit into the locking body accommodating portions 41a formed in the large diameter portion 41 and are locked into the locking recesses 31f (FIGS. 4(a) to 4(c)) formed in the main body sleeve 31. The locking bodies 50 cooperate with the movable body 60, which will be described later, to operate the locking and unlocking of the pivot shaft 40. The locking bodies 50 are disengaged from the locking recesses 31f by the movement of the movable body 60.

[0025] In this embodiment, a metal ball is used as the locking body 50, but other materials and shapes may be used for the locking body 50. Also, in this embodiment, the case where two locking bodies 50 are used is taken as an example, but the number of locking bodies 50 may be one or three or more.

[0026] The movable body 60 is a member for operating the locking and unlocking of the pivot shaft 40. The movable body 60 in this embodiment includes a thin rod-shaped shaft portion 61, a tapered portion 62 continuing to the lower side of the shaft portion 61, and a large diameter portion 63 continuing to the lower side of the tapered portion 62.

[0027] The shaft portion 61 is the portion that fits within the small diameter portion 42 of the pivot shaft 40, the tapered portion 62 is the portion that the locking body 50 abuts against when the movable body 60 is pushed down, and the large diameter portion 63 is the portion that the locking body 50 abuts against when the pivot shaft 40 is positioned at the top of the main sleeve 31.

[0028] The shaft portion 61 is longer than the small diameter portion 42 of the pivot shaft 40, and when both the pivot shaft 40 and the movable body 60 are positioned at the uppermost position, a part of the tip side of the shaft portion 61 passes through the tip opening portion 42a of the small diameter portion 42 and protrudes above the upper end surface of the small diameter portion 42. By pushing down this protruding portion, the locking body 50 disengages from the locking recess 31f, and the pivot shaft 40 is pushed down.

[0029] The elastic body 70 is a member that biases the movable body 60 toward the upper opening 31d of the main body sleeve 31. In this embodiment, a coil spring biased in the expanding direction is used as the elastic body 70.

[0030] One end side (upper end side) of the elastic body 70 is fitted into a spring receiving first recess 63a (FIGS. 4(a) to 4(c)) formed inside the large diameter portion 63 of the movable body 60, and the other end side (lower end side) is fitted into a spring receiving second recess 32b formed in the cover member 32. The elastic body 70 may be made of a spring material other than a coil spring, rubber material, or the like.

[0031] The cover 80 is a member that is placed on the outer periphery of the casing 30 to cover the casing 30. The cover 80 in this embodiment is a half-pipe shape with a bottom that has a space inside, and can cover the casing 30 by placing the cover so that the casing 30 fits into the space.

[0032] (Operation of the pivot hinge of the first embodiment) Next, we will explain the operation of the pivot hinge 100 of the first embodiment. Figure 4(a) shows a state in which the pivot shaft 40 is locked at the uppermost position of the main body sleeve 31. In this state, the locking body 50 is locked in the locking recess 31f, and the pivot shaft 40 cannot be pushed down.

[0033] When the movable body 60 is pushed down (moved) against the biasing force of the elastic body 70 from the state shown in Figure 4(a) to the state shown in Figure 4(b), the locking body 50 comes out of the locking recess 31f and retreats into the locking body accommodating portion 41a, and the pivot shaft 40 is pushed down.

[0034] With the pivot shaft 40 pressed down, when the pivot shaft 40 and the movable body 60 pressed by it are pressed down to a position where their tip ends are contained within the main body sleeve 31 (the position in Figure 4(c)), the pivot shaft 40 is released from its engagement with the door D.

[0035] (Embodiment 2) Another embodiment of the pivot hinge 100 of the present application will be described with reference to the drawings. As shown in Fig. 5, the basic configuration of the pivot hinge 100 of this embodiment is the same as that of the first embodiment. The differences are in the structures of the pivot shaft 40, the movable body 60, and the lid member 32. The following description will focus on the differences from the first embodiment, and a description of the same parts as in the first embodiment will be omitted.

[0036] Like the pivot shaft 40 of embodiment 1, the pivot shaft 40 of this embodiment also has a large diameter portion 41 and a small diameter portion 42. The inside of the pivot shaft 40 is hollow, but the top is closed, and there is no structure equivalent to the tip opening 42a of embodiment 1. The large diameter portion 41 and the small diameter portion 42 have approximately the same height, and the large diameter portion 41 is provided with a pin insertion hole 41b for inserting a support pin 43 therethrough.

[0037] The movable body 60 comprises a shaft portion 64, a large diameter portion 65 continuing from the upper side of the shaft portion 64, a tapered portion 66 connected to the upper side of the large diameter portion 65, and a tip convex portion 67 connected to the upper side of the tapered portion 66.

[0038] An insertion hole 65a, through which the support pin 43 is inserted, is provided at a position spanning the large diameter portion 65 and the tapered portion 66. The insertion hole 65a is a hole with a vertically long opening. An attachment portion 64a is provided on the lower end side of the shaft portion 64 to which a gripper 68, which will be described later, is attached.

[0039] The lid member 32 is a disk-shaped member with an upward opening and a bottom, similar to the lid member 32 of embodiment 1, and has an internal thread portion 32a on its inner circumferential surface that can be threaded onto the external thread of the threaded portion 31c of the main body sleeve 31. The lid member 32 of this embodiment is not provided with the spring receiving second recess 32b of embodiment 1. However, the spring receiving second recess 32b may be provided.

[0040] A through-hole 32c (FIGS. 6(a) to 6(c)) is provided in the center of the bottom of the lid member 32, through which the shaft portion 64 of the movable body 60 can be inserted. The through-hole 32c has an inner diameter that allows the shaft portion 64 to pass through but not the elastic body 70. The through-hole 32c also has an inner diameter that prevents the gripping tool 68 attached to the attachment portion 64a of the shaft portion 64 from passing through.

[0041] A gripping tool 68 is provided on the attachment part 64a at the lower end of the shaft part 64 to grip when the shaft part 64 is pulled out from the through-hole 32c. In this embodiment, a ring is used as the gripping tool 68. The ring-shaped gripping tool 68 can be rotated in a direction to raise the lower end side.

[0042] The gripping tool 68 may be anything other than a ring as long as it can be gripped, and for example, a screw, a screw rod, etc. can be used. In this case, a screw hole can be formed in the bottom surface of the shaft 64, and the helical part of the screw or screw rod can be screwed into the screw hole, and the protruding part that does not fit into the screw hole can be used as the gripping tool 68. A screw rod, etc. can also be used instead of a screw.

[0043] When using a gripping tool 68 that is sized to pass through the through hole 32c, such as a screw or a threaded rod, a stopper of a shape and size that will prevent the gripping tool 68 from slipping out of the through hole 32c can be provided as necessary to prevent the gripping tool 68 from slipping out of the through hole 32c.

[0044] (Operation of the pivot hinge of the second embodiment) Next, we will explain the operation of the pivot hinge 100 of the second embodiment. Figure 6(a) shows a state in which the pivot shaft 40 is locked at the uppermost position of the main body sleeve 31. In this state, the locking body 50 is locked in the locking recess 31f, and the pivot shaft 40 cannot be pushed down.

[0045] From the state shown in Figure 6(a), when the cover 80 is removed, the gripping device 68 is pulled down, and the movable body 60 is pulled down (moved) against the biasing force of the elastic body 70, the locking body 50 comes out of the locking recess 31f and retreats into the locking body accommodating portion 41a, as shown in Figure 6(b).

[0046] When the gripping device 68 is further pulled to pull the movable body 60 down from the state shown in Figure 6(b), the small diameter portion 42 of the pivot shaft 40 connected to the movable body 60 is pulled down to a position where it fits within the main body sleeve 31 (the position shown in Figure 6(c)), and the pivot shaft 40 is released from its engagement with the door D.

[0047] The configurations of the above-described two embodiments are merely examples, and the configuration of the pivot hinge 100 of the present application is not limited to the configurations of these embodiments. The pivot hinge 100 of the present application can be modified, such as by omitting, replacing, or adding components, as long as the intended purpose can be achieved.

[0048] For example, in embodiment 1, the pivot shaft 40 is configured to be pushed down from above, and in embodiment 2, the pivot shaft 40 is configured to be pulled down from below, but the pivot shaft 40 may have any other structure as long as it can be moved downward.

[0049] The pivot hinge 100 of the present application can be attached to the upper part of the hanging side of the door D and door frame F, as shown in Figures 2 and 3, or it can be attached to both the top and bottom of the hanging side or just the bottom.

[0050] The embodiments disclosed in this application are merely examples and are not intended to limit the scope of the pivot hinge of the present invention. The scope of the pivot hinge of the present invention is defined by the claims. The scope of the present invention also includes equivalents to the claims. [Industrial Applicability]

[0051] The pivot hinge 100 of the present application can be attached to the top and bottom of the door, or can be attached to only one of the top and bottom of the door. [Explanation of symbols]

[0052] 10 Frame side member 11 Fixed part 12 Holding part 12a Protrusion 12c Holding hole (through hole) 20 Door side member 21 Door fixing part 22 Receiving part 23 Fitting hole (through hole) 30 Casing 31 Main body sleeve 31a Torso 31b Fitting part 31c Threaded part 31d Upper opening 31e Lower opening 31f Locking recess 32 Lid material 32a female thread 32b Spring holder second recess 32c through hole 40 Pivot axis 41 Large diameter section 41a locking body receiving portion 41b Pin insertion hole 42 Small diameter section 42a Tip opening 43 Support pin 50 Locking body 60 Movable body 61 Shaft 62 Tapered section 63 Large diameter section 63a Spring holder first recess 64 Shaft 64a Mounting part 65 Large diameter section 65a Insertion hole 66 Tapered section 67 Tip convex part 68 Gripping tool 70 Elastic Body 80 Cover 100 Pivot Hinge D Door E entrance F door frame

Claims

1. In pivot hinges, A casing; a hollow pivot shaft disposed within the casing; a movable body disposed within the pivot shaft; an elastic body that biases the movable body; a locking body disposed in a locking body receiving portion formed on a circumferential surface of the pivot shaft; a locking recess in which the locking body can be locked is provided on an inner circumferential surface of the casing, The pivot shaft cannot move when the locking body is locked in the locking recess, and can move when the locking body is disengaged from the locking recess. A pivot hinge characterized by:

2. 2. The pivot hinge of claim 1, The locking body is disengaged from the locking recess by the movement of the movable body. A pivot hinge characterized by:

3. 3. The pivot hinge of claim 2, The pivot shaft becomes movable when the locking body is released from the locking recess. A pivot hinge characterized by:

4. 2. The pivot hinge of claim 1, The pivot shaft has a tip opening; When the movable body is biased by the elastic body, a part of the movable body protrudes from the tip opening. A pivot hinge characterized by:

5. 2. The pivot hinge of claim 1, The movable body is provided with a gripping tool that grips the movable body when moving the movable body. A pivot hinge characterized by:

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