Door closer

Abstract

To provide a door closer which does not adversely affect the durability of an elastic member even if a door is frequently opened by 180 °.SOLUTION: An elastic member 10 in which one end portion of an elastic piece is an attachment portion 11 attached to a side F1 of one side portion of the door frame F, and the other end portion of the elastic piece is a free end and is an urging portion 12 that always urges the hinged door D in a closing direction in a state of being detachably inserted into a recessed portion side D2 opened on one side surface of the hinged door D, and an insertion and removal hole 21 that allows insertion and removal of the urging portion 12 of the elastic member 10, the hinge device includes a restoring force transmission means 20 which is provided in an opening of a recessed side D2 of the hinged door D, guides an insertion / removal posture of an elastic member 10 in the recessed side D2 of the hinged door D, and transmits an elastic restoring force of the elastic member 10 to the hinged door D, and a swing support means 30 which swingably supports a mounting part 11 of the elastic member 10 around a swing shaft 32 set in parallel with a rotation shaft H1 of a hinge H on one side part of a door frame F. The swing support means 30 swings around the swing shaft 32, so that the mounting part 11 of the elastic member 10 can swing around the swing shaft 32 on one side F1 of the door frame F.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a door closer. [Background technology]

[0002] A door closer composed of a rectangular elastic piece has been known for use with a swing door (hereinafter simply referred to as a door) (see, for example, Patent Document 1). This door closer constantly biases a door pivotally attached to one side of a door frame via a hinge in a closing direction. The door closer includes an elastic member, one end of which serves as an attachment portion fixed to one side of the door frame, and the other end of which serves as a free end and serves as a biasing portion that constantly biases the door in a closing direction while being removably inserted into a recess opened on one side of the door, and a restoring force transmission member that is provided in the opening of the recess in the door, guiding the insertion and removal position of the elastic member in the recess in the door and transmitting the elastic restoring force of the elastic piece to the door. This type of door closer is superior to other types of door closers in that it does not impair the design of the door or the atmosphere around the entrance / exit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-175481 Summary of the Invention [Problem to be solved by the invention]

[0004] Normally, doors are not opened very wide when people are simply entering or exiting, but they may be left open when, for example, ventilating a room or carrying something in or out. In such cases, if there are no obstacles, such as furniture or other walls, on the side of the hinge of the door frame, the door may be opened to its maximum extent of approximately 180 degrees so that the door itself does not get in the way.

[0005] When the door is opened 180 degrees, the elastic member of the conventional door closer is stretched to its maximum extent, drawing a roughly semicircular arc. This state places a considerable load on the elastic member made of elastic pieces. If this state is repeated frequently, fatigue will accumulate in the elastic member, which may have a negative impact on its durability.

[0006] The present invention has been made to solve the above problems, and its purpose is to provide a door closer that does not adversely affect the durability of the elastic member even when the door is frequently opened 180 degrees. [Means for solving the problem]

[0007] In order to solve the above problems, the door closer disclosed in the present application is a door closer that always biases a hinged door pivotally attached to one side of a door frame via a hinge in a closing direction, and is composed of a rectangular elastic piece, one end of which is an attachment part that is attached to one side of the door frame, and the other end of which is a free end that is an urging part that always biases the hinged door in the closing direction when inserted in a removably manner into a recessed part opened on one side of the hinged door, and an insert / removal mechanism that allows the urging part of the elastic member to be inserted and removed. a restoring force transmitting means having a hole and provided at the opening of the recess of the hinged door, guiding the insertion and removal posture of the elastic member in the recess of the hinged door and transmitting the elastic restoring force of the elastic piece to the hinged door; and a swing support means supporting the attachment portion of the elastic member so that it can swing around a swing axis set parallel to the rotation axis of the hinge at one side of the door frame, wherein the swing support means swings around the swing axis so that the attachment portion of the elastic member can swing around the swing axis at one side of the door frame. It is characterized by the following.

[0008] In the above door closer, the swing support means may include a pivot shaft that serves as the swing axis, and an elastic member support portion that has an insertion hole at the base end through which the pivot shaft is inserted, and a connecting portion at the tip end to which the attachment portion of the elastic member is connected, and that swings around the pivot shaft.

[0009] In the door closer, the swing support means may further include a biasing member that biases the hinged door in a closing direction.

[0010] In the above door closer, the swing support means may comprise a pivot shaft that serves as the swing axis, and an elastic member support portion that is pivotally supported on the pivot shaft and has an outer surface to which the attachment portion of the elastic member is connected. [Effects of the Invention]

[0011] According to the door closer disclosed in the present application, the durability of the elastic member is not adversely affected even if the door is frequently opened 180 degrees. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view showing an embodiment of a door closer disclosed herein; FIG. [Figure 2] FIG. 2 is an exploded perspective view of the door closer shown in FIG. 1. [Figure 3] 1. FIG. 4 is a partially enlarged perspective view showing a modified example of the swing support means of the door closer shown in FIG. [Figure 4] FIG. 2 is a schematic cross-sectional view showing the hinged door in a closed state. [Figure 5] FIG. 10 is a schematic cross-sectional view showing the hinged door opened by 90°. [Figure 6] FIG. 1 is a schematic cross-sectional view showing a state in which the hinged door is opened 180°. [Figure 7] FIG. 10 is a schematic cross-sectional view showing another embodiment of the door closer disclosed herein. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the following embodiments are examples of embodiments that embody the present invention and are not intended to limit the technical scope of the present invention. Furthermore, the same reference numerals are used to designate components that are common to the following descriptions and drawings.

[0014] <Embodiment 1> -Door closer configuration- One embodiment of the door closer disclosed in the present application will be described. The door closer 1 exemplified here, as shown in Figure 1, always biases a hinged door D pivotally attached to one side F1 of a door frame F via a hinge H in the closing direction.

[0015] Specifically, the door closer 1 includes an elastic member 10, a restoring force transmission member 20, and a swing support means 30, as shown in FIGS.

[0016] The elastic member 10 is composed of a rectangular elastic piece. The material of this elastic piece may be either metal or synthetic resin, and a material that exhibits a predetermined elastic restoring force and is resistant to fatigue failure is suitable. The number of elastic pieces constituting the elastic member 10 may be one, or two or more pieces may be stacked together. One end of the elastic piece serves as an attachment part 11 that is attached to one side part F1 of the door frame F. Meanwhile, the other end of the elastic piece serves as an urging part 12 that is removably inserted into a recess D2 opened in one side surface D1 of the hinged door D and always urges the hinged door D in the closing direction.

[0017] When the elastic member 10 thus configured is forcibly bent in a direction in which the attachment portion 11 and the biasing portion 12 approach each other, an elastic restoring force corresponding to the degree of deformation is generated, and the biasing portion 12 tries to return to its original shape. This elastic restoring force is appropriately set to a value corresponding to the size, weight, smoothness of opening and closing of the hinged door D to which it is to be attached, etc. If the restoring elastic force is too large compared to the above-mentioned conditions of the hinged door D, the hinged door D will close quickly but the impact noise when closing will be louder, and if it is too small, the hinged door D will close slowly, reducing the impact noise but taking longer to close, which may increase the movement of air between the inside and outside of the hinged door D and, for example, have a negative impact on air conditioning.

[0018] As shown in Figures 1 and 2, the restoring force transmission member 20 in this embodiment has an insertion / removal hole 21 that allows the insertion and removal of the spring portion 12 of the elastic member 10, and is provided in the opening D3 of the recess D2 of the hinged door D, and guides the insertion / removal posture of the elastic member 10 in the recess D2 of the hinged door D and transmits the elastic restoring force of the elastic member 10 to the hinged door D.

[0019] Specifically, the restoring force transmission member 20 includes a main body 22 that is fitted into the opening D3 of the recess D2 of the hinged door D, and a fixing portion 23 that is provided on the open end side of the main body 22 and fixed to one side surface D1 of the hinged door D. The fixing portion 23 is provided with insertion holes 24 through which fixing screws (not shown) are inserted, at multiple locations symmetrically on either side of the open end of the main body 22 (six locations in total, three locations each in the illustrated example), and is also provided with a flange portion 25 that is attached to one surface of the hinged door D. In addition, a corner of the main body 22 on the open end side in the opening direction of the hinged door D is chamfered in an arc shape 26 so as not to interfere with the elastic member 10 when the hinged door D is opened or closed (see FIGS. 4 to 7).

[0020] The restoring force transmission member 20 configured as described above is preferably formed of a material having excellent abrasion resistance, regardless of whether it is made of metal or synthetic resin, since one inner surface of the main body 22 is always pressed against the elastic member 10 and is in sliding contact with the elastic member 10 as the hinged door D opens and closes. The restoring force transmission member 20 is an example of the "restoring force transmission means" of the present invention, and is not limited to the above example. Furthermore, instead of using such a restoring force transmission member 20 as the restoring force transmission means, for example, as shown in the schematic diagram of FIG. 4, the restoring force transmission means may be formed on the hinged door D itself so that the elastic restoring force of the elastic member 10 is directly transmitted to the hinged door D.

[0021] As shown in Figures 1 to 7, the swing support means 30 in this embodiment supports the attachment portion 11 of the elastic member 10 so that it can swing around a swing axis 32 set parallel to the rotation axis H1 of the hinge H on one side of the door frame F.

[0022] Specifically, as shown in Figures 1 and 2, the swing support means 30 comprises a receiving seat 31 fitted into a support recess F3 formed on the inner surface F2 of one side F1 of the door frame F, a pivot shaft 32 which serves as the swing axis and is installed within the receiving seat 31, an elastic member support part 33 which has insertion holes 331, 331 at the base end through which the pivot shaft 32 is inserted and a connecting part 332 at the tip end to which the attachment part 11 of the elastic member 10 is connected, and which swings around the pivot shaft 32, spacers 34, 34 fitted onto the pivot shaft 32 between the elastic member support part 33 and the receiving seat 31, and clamping pieces 35, 35 which clamp the attachment part 11 of the elastic member 10 when the attachment part 11 is connected to the connecting part 332 of the elastic member support part 33 and are interposed between the connecting part 332 and the attachment part 11.

[0023] The catch 31 is composed of a rectangular parallelepiped main body 312 with an opening 311 on one side, and a pair of flanges 313, 313 extending from the upper and lower edges of the main body 312. Each of the flanges 313, 313 has two insertion holes 314 through which unillustrated fixing screws are inserted. As shown in FIG. 3, the internal space of the main body 312 is the minimum size possible to accommodate the elastic member support part 33. In addition, a pair of support holes 315 for receiving each end of the pivot shaft 32 is provided oppositely on the upper and lower inner surfaces of the main body 312. These support holes 315 are offset from the door stop S of the door frame F, contributing to the miniaturization of the main body 312. The receiving seat 31 thus formed is fitted into a support recess F3 of the door frame F, which is formed to match its outer shape, and is fixed to the inner surface F2 of one side portion F1 of the door frame F by inserting a fixing screw (not shown) into the insertion hole 314 of the flange portions 313, 313.

[0024] The elastic member support portion 33 is composed of a pair of upper and lower swinging pieces 333, 333 and a connecting portion 332 provided to connect the tip ends of these swinging pieces 333, 333, and is formed in a so-called U-shape in side view. Insertion holes 331, 331 through which the pivot shaft 32 is inserted, are provided on the base end sides of the swinging pieces 333, 333. The inner diameter of the insertion holes 331, 331 is sized to fit with protrusions 341, 341 protruding from one end of each spacer 34, 34. The protrusions 341, 341 of the spacers 34, 34 are interposed between the insertion holes 331, 331 and the pivot shaft 32, and this, together with the size of the inner diameter of the spacers 34, 34 approximately matching the outer diameter of the pivot shaft 32, prevents the elastic member support portion 33 from rattling. The connecting portion 332 is provided with two female screw holes 335, 335 at the top and bottom, into which fixing screws 334, 334 are threaded to fix the attachment portion 11 of the elastic member 10. The elastic member support portion 33 is not limited to the U-shape as described above, and for example, the rocking pieces 333, 333 may be attached to the connecting portion 332 at positions inward from both ends, or one or more rocking pieces may be added between the two rocking pieces 333, 333, or only one rocking piece 333 may be provided in the center of the back surface of the connecting portion 332.

[0025] The spacers 34, 34 are provided so that the upper and lower inner surfaces of the main body 312 of the catch 31 do not come into direct contact with the swinging pieces 333, 333 of the elastic member support part 33, and also so that, as described above, no rattle occurs in the swinging movement of the elastic member support part 33. The inner diameter of the spacers 34, 34 is sized to approximately match the outer diameter of the pivot shaft 32.

[0026] The clamping pieces 35, 35 have a vertical dimension that is the same as or smaller than the width dimension of the elastic member 10. The edges of these clamping pieces 35, 35 facing the urging part 12 of the elastic member 10 are curved parts 351, 351 that curve outward, as shown in Fig. 3, so that stress is not locally applied to the elastic member 10 at this part when the elastic member 10 deforms as the hinged door D opens and closes. In addition, the clamping pieces 35, 35 are provided with insertion holes at two positions, one above the other, through which fixing screws 334, 334 are inserted. It is also possible to omit these clamping pieces 35, 35 and directly attach the attachment part 11 of the elastic member 10 to the connecting part 332.

[0027] In the above-described first embodiment, the swing support means 30 swings around the pivot shaft 32, which displaces the attachment portion 11 of the elastic member 10. This raises a concern that when the hinged door D is in the fully closed state as shown in FIG. 4, the biasing force of the biasing portion 12 of the elastic member 10 acting on the restoring force transmission member 20 may be smaller than when the attachment portion 11 is immovably fixed to the door frame F, depending on various conditions such as the weight and size of the hinged door D. To overcome this concern, in this embodiment, coil springs 36, 36 that bias the hinged door D in the closing direction are fitted onto the spacers 34, 34, and one end of each spring is engaged with each of the engagement holes 316 provided on the upper and lower inner surfaces of the catch 31, while the other end is engaged with each of the engagement holes 336 provided on the swing pieces 333, 333 of the elastic member support portion 33, thereby adding the coil springs 36 to the swing support means 30. This allows the hinged door D to be always maintained in the fully closed state.

[0028] In the above example, the two coil springs 36 are arranged by fitting them onto the spacers 34 between the oscillating pieces 333 of the elastic member support portion 33 and the upper and lower inner surfaces of the catch 31. However, this is not limiting. For example, as shown in Fig. 3, one coil spring 36 may be arranged by fitting it onto the pivot shaft 32 inside the oscillating pieces 333 of the elastic member support portion 33. That is, the coil spring 36 has a fixing portion 361 at its axial center, and this fixing portion 361 is fixed to the main body 312 of the catch 31 by a fixing member 317 and a fixing screw 318, and both ends 362 (only the lower end is shown in Fig. 3) are engaged with respective engagement holes 336 (only the lower engagement hole is shown in Fig. 3) formed in the oscillating pieces 333 of the elastic member support portion 33. According to this modification, the internal space of the elastic member support portion 33 can be effectively utilized, so that the catch 31 can be made smaller than in the above example, and a coil spring 36 having a greater elastic force can be employed. Note that the coil spring 36 is not essential and may be omitted. Note that the fixing screw inserted into the insertion hole 314 of the catch 31 is not shown in Figure 3.

[0029] - Door closer installation and operation - To install the door closer 1 of this embodiment, the restoring force transmission member 20 is attached to the hinged door D, while the elastic member 10 is attached to the elastic member support portion 33 of the swing support means 30, and then the biasing portion 12 of the elastic member 10 is inserted into the main body portion 22 through the insertion / removal hole 21 of the restoring force transmission member 20, and the receiving seat 31 of the swing support means 30 is fixed to the support recess F3 on one side portion F1 of the door frame F to complete the installation. However, the installation procedure is not limited to this.

[0030] When the door closer 1 is completely installed and the hinged door D is in the fully closed state as shown in Fig. 4, the elastic restoring force of the elastic member 10 is transmitted from the biasing portion 12 to the hinged door D via the restoring force transmitting member 20, and as a result, the hinged door D is continuously biased in the closing direction by the elastic restoring force. In addition, the elastic member support portion 33 is housed within the catch 31. In addition, at this time, the biasing force of the coil spring 36 also works together, maintaining the hinged door D in the fully closed state.

[0031] As the hinged door D opens, the elastic member support portion 33 swings around the pivot shaft 32 to follow the movement, and the connecting portion 332 of the elastic member support portion 33 is displaced until it comes close to the opening 311 of the catch 31. As the hinged door D opens further, the swing angle of the elastic member support portion 33 gradually increases as shown in FIG. 5. When the hinged door D is fully opened to approximately 180°, the swing angle of the elastic member support portion 33 reaches its maximum as shown in FIG. 6. In this way, the elastic member support portion 33 swings to follow the movement of the hinged door D, and the position of the attachment portion 11 of the elastic member 10 is displaced so that the elastic member 10 is in a position where it is not subjected to excessive bending stress. Therefore, even if the hinged door D is frequently opened to 180°, there is no risk of the durability of the elastic member 10 decreasing. Note that the movements of the various parts when the hinged door D rotates from the fully open state of 180° to the fully closed state are simply reversed from those in the opening operation of the hinged door D described above.

[0032] <Embodiment 2> Next, still another embodiment of the door closer disclosed herein will be described with reference to Figure 7. The door closer 1 illustrated here differs from the above-described embodiment 1 only in the configuration of the swing support means 30, so only the differences will be described below, and the same components as those in the above embodiment will be given the same reference numerals and redundant explanations will be omitted. Note that, like the door closer 1 of the above-described embodiment, the door closer 1 of this embodiment also biases a hinged door D pivotally attached to one side F1 of a door frame F via a hinge H in a direction to always close.

[0033] In this embodiment, the swing support means 30 includes a pivot shaft 32 that serves as the swing shaft, and an elastic member support part 33 that is pivotally supported on the pivot shaft 32 and has an outer surface to which the attachment part 11 of the elastic member 10 is connected. The elastic member support part 33 is formed by cutting away a part of the circumferential surface of a cylindrical body in the direction along its axis, and the surface formed by this cutting serves as a connecting part 332 to which the attachment part 11 of the elastic member 10 is connected, and an insertion hole 337 for the pivot shaft 32 is formed in the axial part. The elastic member 10 is connected to the connecting part 332 using clamping pieces 35, 35, as in the first and second embodiments.

[0034] 7, the two-dot chain line indicates the state in which the hinged door D is fully closed, and the solid line indicates the state in which the hinged door D is opened 180°. As is clear from this figure, although the swinging movement of the attachment part 11 of the elastic member 10 is smaller than in the first and second embodiments, the attachment part 11 of the elastic member 10 swings in accordance with the movement of the hinged door D, and the position of the attachment part 11 of the elastic member 10 is displaced so that the elastic member 10 is in a position in which it is not subjected to excessive bending stress, so that there is no risk of the durability of the elastic member 10 decreasing even if the hinged door D is frequently opened fully to 180°.

[0035] It should be noted that the present invention can be embodied in various other forms without departing from its spirit or main features. Therefore, the above-described embodiments are merely illustrative in all respects and should not be interpreted as limiting. The scope of the present invention is defined by the claims and is not limited in any way by the descriptions in the specification and drawings. Furthermore, all modifications and variations within the equivalent range of the claims are within the scope of the present invention. [Explanation of symbols]

[0036] 1 Door Closer 10 Elastic member 11 Mounting part 12. Actuation section 20 Restoring force transmission member (restoring force transmission means) 21 Insertion / removal hole 22 Main body 23 Fixed part 24 Insertion hole 25 flange 26 Chamfering 30 Swing support means 31 catch seat 311 Opening 312 Main body 313 Flange 314 Insertion hole 315 Support hole 316 Engagement hole 317 Fixing member 318 Fixing screw 32 Swing axis (pivot axis) 33 Elastic member support part 331 Insertion hole 332 Connecting part 333 Swing piece 334 Fixing screw 335 Female screw hole 336 Engagement hole 337 Insertion hole 34 Spacer 341 Convex 35 Clamping piece 351 Curved section 36 Coil spring (biasing member) 361 Fixed part 362 End D Swing door D1 One side D2 recess D3 aperture F door frame F1 One side F2 inner surface F3 Support recess H hinge H1 Rotation axis S door stop

Claims

1. A door closer that always biases a swing door pivotally attached to one side of a door frame via a hinge in the closing direction, The door frame is made of a flexible material, and one end of the flexible material is an attachment part that is attached to one side of the door frame, while the other end of the flexible material is a free end that is removably inserted into a recess opened on one side of the hinged door and serves as a biasing part that always biases the hinged door in the closing direction; a restoring force transmitting means for transmitting the elastic restoring force of the elastic piece to the hinged door, the restoring force transmitting means having an insertion / removal hole for allowing the insertion / removal of the biasing portion of the elastic member, the restoring force transmitting means being provided at the opening of the recess of the hinged door, and guiding the insertion / removal posture of the elastic member in the recess of the hinged door; a swing support means for swingably supporting the attachment portion of the elastic member on one side of the door frame around a swing axis set parallel to the rotation axis of the hinge, The swing support means swings around the swing axis, so that the attachment portion of the elastic member can swing around the swing axis at one side of the door frame. A door closer characterized by:

2. 2. The door closer according to claim 1, The swing support means is A pivot shaft serving as the swing shaft; an elastic member support portion that has an insertion hole at a base end side through which the pivot shaft is inserted and a connecting portion at a tip end side to which an attachment portion of the elastic member is connected, and that swings around the pivot shaft; A door closer comprising:

3. The door closer according to claim 2, The door closer is characterized in that the swing support means further includes a biasing member that biases the hinged door in a closing direction.

4. 2. The door closer according to claim 1, The swing support means is A pivot shaft serving as the swing shaft; an elastic member support portion that is pivotally supported on the pivot shaft and has an outer surface to which the attachment portion of the elastic member is connected; A door closer comprising:

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