Door closer and its mounting method

Abstract

To provide a door closer which does not impair the aesthetic property of a door and the atmosphere in the vicinity of a doorway, does not jump around even if a bent part is broken, and is excellent in safety.SOLUTION: A door closer includes: an elastic member 10 formed as a strip-shaped elastic piece, one end portion of the elastic piece being bent and serving as a fixed portion 11 fixed to one side portion of a door frame F, the other end portion of the elastic piece being a free end and serving as an urging portion 12 that constantly urges a hinged door D in a closing direction by an elastic restoring force of the elastic piece in a sliding contact state with a front surface D1 of the hinged door D; and a restoring force transmission member 20 which is attached to the hinged door D so as to straddle the urging portion 12 and guides the sliding contact posture of the elastic member 10 on the front surface D1 of the hinged door D.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a door closer and an installation method thereof. [Background technology]

[0002] Conventionally, door checkers have been widely used as a device for automatically closing swing doors (hereinafter simply referred to as doors) in which the hydraulic pressure in a cylinder is adjusted with an adjustment valve to adjust the force that a spring applies to the door, thereby controlling the speed at which the door closes (see, for example, Patent Document 1).

[0003] The door checkers are attached to the upper edge of the door, but the body containing the cylinder, spring, etc. tends to be large, and since they have a bent arm that connects to the door frame and protrudes significantly from the door surface, they are conspicuous even though they are above people's line of sight, and often ruin the design of the door and the atmosphere around the entrance. In addition, because the mechanism is complicated, they are expensive, the installation work on the door and door frame is troublesome, and it is also troublesome to adjust the speed at which the door closes.

[0004] As a solution to these disadvantages of conventional door checkers, for example, Patent Document 2 discloses a method in which a plate-shaped elastic body is fixed to the support pillars between the hinges of the gate, and the surface of this plate-shaped elastic body is brought into contact with the back surface of the gate, thereby automatically closing the gate by the elastic force of the plate-shaped elastic body. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 55-152282 [Patent Document 2] Japanese Utility Model Application Publication No. 2-71800 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the plate-shaped elastic body disclosed in Patent Document 2 is provided between the upper and lower hinges of the gate pillar and widely covers the gap between the gate and the pillar material. Therefore, while it is beneficial in terms of increasing the shielding properties of gates that are installed exclusively outdoors, it is too large, particularly for use on indoor doors, and as with conventional door checkers, it detracts from the door design and the atmosphere around the entrance and exit, and therefore could not be adopted.

[0007] In addition, the plate-shaped elastic body is repeatedly bent at specific points when the door is opened and closed, and there is a risk that the bent points will break due to fatigue. If the plate-shaped elastic body breaks, the free end of the plate-shaped elastic body, which is simply in contact with the surface of the gate, will bounce in an unexpected direction due to the elasticity of the plate-shaped elastic body itself. As a result, there is a risk of injury to anyone nearby.

[0008] The present invention has been made to solve the above problems, and its object is to provide a door closer that does not impair the design of the door or the atmosphere around the entrance when used on a door. Another object of the present invention is to provide a door closer that is extremely unlikely to break at the bent part, and even if the bent part does break, it will not jump around, and is excellent in durability and safety. Still another object of the present invention is to provide an installation method that allows the door closer to be easily installed. [Means for solving the problem]

[0009] In order to solve the above problems, the door closer disclosed in the present application is a door closer that constantly urges a swing door pivotally attached to one side of a door frame via a hinge in a direction to close, and is characterized in comprising: an elastic member composed of at least two overlapping rectangular elastic pieces, one end of which is a fixed part that is fixed to one side of the door frame, while the other end of the elastic piece is a free end that constantly urges the swing door in a direction to close by the elastic restoring force of the elastic piece while in sliding contact with the surface of the swing door; and a restoring force transmission member that is attached to the swing door so as to straddle the urging part and transmits the elastic restoring force of the elastic piece to the swing door.

[0010] In the above door closer, a locking portion protruding in a direction intersecting the longitudinal direction of the elastic member is provided at the tip of the free end of the elastic member, and the restoring force transmission member may engage with the locking portion when the hinged door is in a predetermined fully open state.

[0011] The door closer may further include a decorative cover provided on a surface of the hinged door and integrally covering the biasing portion of the elastic member and the restoring force transmission member.

[0012] Another door closer disclosed in the present application is a door closer that constantly urges a swing door pivotally attached to one side of a door frame via a hinge in a direction to close, and is characterized in comprising: an elastic member composed of at least two overlapping rectangular elastic pieces, one end of which is a fixed part that is fixed to one side of the door frame, while the other end of the elastic piece is a free end that is a urging part that constantly urges the swing door in a direction to close when it is removably inserted into a recess opened in one side of the swing door; and a restoring force transmission member that has a slit that allows the urging part of the elastic member to be inserted and removed, is provided at the opening of the recess of the swing door, and guides the insertion and removal position of the elastic member in the recess of the swing door and transmits the elastic restoring force of the elastic piece to the swing door.

[0013] In the above door closer, a locking portion protruding in a direction intersecting the longitudinal direction of the elastic member is provided at the tip of the free end of the elastic member, and the restoring force transmission member may be provided with a removal prevention portion at one end of the slit that allows the locking portion to enter the recess while preventing the locking portion from being removed from the recess.

[0014] In the above door closer, the restoring force transmission member may further include a cover portion that can be inserted into the recess of the hinged door and covers at least the surface of the elastic member facing in the biasing direction.

[0015] The door closer may further include an anchor member attached to the fixing portion of the elastic member and embedded in the inner surface of one side of the door frame.

[0016] The installation method of the door closer disclosed in the present application includes the steps of: fixing the restoring force transmission member to the opening of the recess of the swing door while the swing door is in an open state; inserting the elastic member into the recess of the swing door via the restoring force transmission member, and temporarily fixing the anchor member to the restoring force transmission member via an installation jig that is detachable from both members; closing the swing door while maintaining the temporarily fixed state, and embedding the anchor member into the inner surface of one side of the door frame; after confirming that the embedding is complete, opening the swing door while holding the anchor member to maintain the embedded state and removing the installation jig; and fixing the anchor member to one side of the swing door. Effect of the Invention

[0017] The door closer disclosed in the present application does not impair the design of the door or the atmosphere around the entrance, and is extremely unlikely to break at the bent part. Even if the bent part does break, it does not fly around, so it is durable and safe. Furthermore, the installation method of the door closer disclosed in the present application makes it easy to install the door closer. [Brief description of the drawings]

[0018] [Figure 1] 1A to 1D are diagrams illustrating an elastic member in one embodiment of a door closer disclosed herein, where (a) is a side view, (b) is a plan view, (c) is a front view, and (d) is an exploded plan view. [Diagram 2] 1A to 1D are diagrams illustrating a restoring force transmission member in one embodiment of a door closer disclosed herein, where (a) is a plan view, (b) is a front view, (c) is a perspective view, and (d) is a side view. [Diagram 3] 3 is a front view showing an engagement state between an engagement portion of the elastic member shown in FIG. 1 and a restoring force transmission member shown in FIG. 2. [Figure 4] 1A to 1D are diagrams illustrating a decorative cover in one embodiment of a door closer disclosed herein, where (a) is a plan view, (b) is a front view, (c) is a perspective view, and (d) is a side view. [Diagram 5] 5 is a schematic diagram showing an attached state of the decorative cover shown in FIG. 4. FIG. [Figure 6] 3A and 3B are schematic diagrams illustrating the operation of the door closer and the swing door illustrated in FIG. 1 and FIG. 2, in which (a) shows the swing door closed, (b) shows the swing door in the middle of opening or closing, and (c) shows the swing door fully open. [Figure 7] 13 is a perspective view illustrating a restoring force transmission member in another embodiment of a door closer disclosed herein. FIG. [Figure 8] 8A, 8B, 8C, and 8D are plan, front, side, and central longitudinal sectional views, respectively, of the restoring force transmission member shown in FIG. 7. [Figure 9] 8 is a schematic cross-sectional view showing an engagement state between a slip-off prevention portion of the restoring force transmission member shown in FIG. 7 and a locking portion of the elastic member. FIG. [Figure 10] 5A to 5C are schematic diagrams illustrating the operation of a door closer and a swing door in another embodiment of the door closer disclosed herein, in which (a) shows the swing door closed, (b) shows the swing door being in the middle of opening or closing, and (c) shows the swing door fully open. [Figure 11] 13 is a perspective view illustrating an elastic member in still another embodiment of the door closer disclosed herein. FIG. [Figure 12]12 is an exploded perspective view of the elastic member shown in FIG. 11. [Figure 13] 12 is a front view of the elastic member shown in FIG. [Figure 14] FIG. 14 is a partial cross-sectional view taken along the line AA in FIG. [Figure 15] 12 is a perspective view showing a mounting state of the elastic member shown in FIG. 11. FIG. [Figure 16] 1A and 1B are perspective views showing another embodiment of the door closer disclosed herein, in which (a) is a perspective view showing an elastic member, a restoring force transmission member, and an anchor member, (b) is a perspective view showing the elastic member and the anchor member, and (c) is a perspective view showing the restoring force transmission member. [Figure 17] 17A is a front view showing an elastic member, a restoring force transmission member and an anchor member of the door closer shown in FIG. 16, FIG. 17B is a plan view of the same, and FIG. [Figure 18] 17A and 17B show the installation state of the door closer shown in FIG. 16, where (a) is a horizontal cross-sectional view and (b) is a perspective view seen from the front. [Figure 19] 1A shows an installation jig used in the installation method of the door closer disclosed herein, where (a) is a front view, (b) is a plan view, (c) is a right side view, (d) is a bottom view, (e) is a rear view, and (f) is a left side view. [Figure 20] 20A and 20B show the mounting jig shown in FIG. 19, in which (a) is a perspective view seen from the rear side, and (b) is a perspective view seen from the front side. [Figure 21] 2A to 2G are explanatory diagrams showing a method of installing the door closer disclosed in the present application. [Figure 22] 1A and 1B are schematic cross-sectional views illustrating the relationship between the anchor member and the anchor mounting hole in the mounting method of the door closer disclosed in the present application. [Diagram 23] 1A to 1D are explanatory diagrams of an anchor mounting hole in the mounting method of a door closer disclosed herein, where (a) is a plan view, (b) is a front view, (c) is a cross-sectional view along line cc in (b), and (d) is a perspective view. [Figure 24] 5A and 5B show a modified example of the elastic member, in which (a) is a front view of the elastic member, and (b) is a rear view of the elastic member. [Diagram 25]1A and 1B show another modified example of an elastic member and an example of a hook member, where (a) is a front view of the elastic member and the hook member, (b) is a perspective view of the hook member, and (c) is a perspective view showing the engaged state of the elastic member and the hook member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] 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. In addition, the same reference numerals are used to designate the same components in the following description and drawings.

[0020] <Embodiment 1> -Door closer configuration- An embodiment of a door closer disclosed in the present application will be described. The door closer 1 illustrated here is for always biasing a hinged door D pivotally attached to one side F1 of a door frame F via a hinge H in the closing direction, as shown in Fig. 6.

[0021] Specifically, the door closer 1 includes an elastic member 10 and a restoring force transmission member 20, as shown in FIGS.

[0022] The elastic member 10 is composed of two rectangular elastic pieces 10a, 10b stacked together. These two elastic pieces are of the same shape and thickness. The elastic pieces 10a, 10b may be made of either metal or synthetic resin, and a material that exhibits a predetermined elastic restoring force and is not easily broken by fatigue is suitable. In the case of metal, for example, a high-strength steel plate, so-called high-tensile material, is used. Specifically, NSS HT1770 (SUS632J1), a precipitation hardening stainless steel manufactured by Nippon Steel Stainless Steel Corporation, is suitable. When this high-tensile material is used, if the weight of the hinged door D is less than 10 kg, it is suitable to use two elastic pieces 10a, 10b with a length of 130 mm to 150 mm, a width of 30 mm, and a thickness of 0.2 to 0.3 mm. In addition, when the weight of the hinged door D is 10 kg or more and less than 20 kg, it is suitable to use two elastic pieces 10a, 10b each having a length of 130 mm to 150 mm, a width of 30 mm, and a thickness of 0.4 mm. Furthermore, when the weight of the hinged door D is 20 kg or more, it is suitable to use two or three elastic pieces 10a, 10b each having a length of 130 mm to 150 mm, a width of 30 mm, and a thickness of 0.5 to 0.6 mm. Examples of the means for overlapping the elastic pieces 10a, 10b include, but are not limited to, adhesion with an adhesive or welding.

[0023] One end of the elastic piece is bent to form a fixed portion 11 that is fixed to one side portion F1 of the door frame F. On the other hand, the other end of the elastic piece is a free end that forms a biasing portion 12 that always biases the hinged door D in the closing direction by the elastic restoring force of the elastic piece while in sliding contact with the surface D1 of the hinged door D. The fixed portion 11 is provided with fixing device insertion holes 14, 14 through which fixing devices such as screws are inserted.

[0024] The number of elastic pieces constituting the elastic member 10 is not limited to the above-mentioned two or three pieces, but may be four or more pieces depending on the weight of the hinged door D, and the length and width are not limited to the above-mentioned example. The elastic member 10 may be a combination of different materials, for example, a metal elastic piece and a synthetic resin elastic piece, and further, for example, when all the elastic pieces are made of metal, different metal materials may be used, or the same or different metal materials with different thicknesses may be used. Furthermore, the elastic pieces do not need to have the same shape, and for example, wide and narrow ones may be overlapped. Moreover, it is not necessary for the elastic pieces to be overlapped over the entire area of ​​the elastic member 10, and it is sufficient that at least the bent parts are overlapped.

[0025] The elastic member 10 thus constructed has an original shape in the state where the one end is bent, and when the fixing part 11 and the biasing part 12 are forcibly deformed from this state in the direction in which the fixing part 11 and the biasing part 12 open, an elastic restoring force corresponding to the degree of deformation is generated, and the biasing part 12 tries to return to the original shape. This elastic restoring force is appropriately set to a value corresponding to the size, weight, smoothness of opening and closing, etc. of the hinged door D to which it is to be attached. If the restoring elastic force is too large compared to the above conditions of the hinged door D, the hinged door D closes quickly but the impact sound when closing becomes louder, and if it is too small, the hinged door D closes slowly, the impact sound is suppressed but it takes time to close, so that the movement of air between the inside and outside of the hinged door D increases, which may have a negative effect on, for example, air conditioning. In the illustrated example, the angle formed by the fixing part 11 and the biasing part 12 is set to an acute angle slightly smaller than a right angle, so as to suppress the possibility that the elastic restoring force of the elastic piece gradually decreases over time due to repeated opening and closing of the hinged door D. In addition, even when the hinged door D reaches the closed state, the elastic restoring force of the elastic member 10 acts on the hinged door D, albeit very small, so that the hinged door D is pressed against the door stop S, thereby ensuring that it can be closed reliably.

[0026] Moreover, the elastic member 10 is provided at the tip of the free end thereof with a locking portion 13 that protrudes in a direction intersecting with the direction along the longitudinal direction of the elastic member 10. In the illustrated example, only one locking portion 13 protrudes in one direction, but two may protrude in opposite directions. Furthermore, the shape of this locking portion 13 does not need to be rectangular as in the illustrated example, and may be, for example, an arc or a polygon, or may be any shape. Moreover, the locking portion 13 is not essential, and may not be provided at all. Furthermore, the locking portion 13 may be provided on both elastic pieces constituting the elastic member 10, or on only one of the elastic pieces.

[0027] The restoring force transmission member 20 is attached to the hinged door D so as to straddle the biasing portion 12 of the elastic member 10. This restoring force transmission member 20 transmits the elastic restoring force of the elastic piece to the hinged door D.

[0028] Specifically, as shown in Fig. 2, the restoring force transmission member 20 is composed of a pair of base portions 21, 21 attached to the surface D1 of the hinged door D, and a straddling portion 22 installed between these base portions 21, 21. The dimension between the opposing inner edges 28, 28 of the base portions 21, 21 is set to be slightly larger than the width dimension of the biasing portion 12 of the elastic member 10. In addition, the height of the straddling portion 22 is set to be slightly larger than the thickness of the elastic member 10. The base portions 21, 21 each have a fixing tool insertion hole 23, 23 formed at a position point-symmetrical with respect to the center of the restoring force transmission member 20. As a result, the restoring force transmission member 20 is firmly fixed to the surface D1 of the hinged door D without wobbling, so that the elastic restoring force of the elastic piece received from the biasing portion 12 of the elastic member 10 can be firmly received.

[0029] In this embodiment, when the hinged door D is in a predetermined fully open state, the restoring force transmission member 20 is engaged with the locking portion 13 of the elastic member 10 at one end thereof as shown in Fig. 3. In this case, the restoring force transmission member 20 is disposed at a position where it comes into contact with the locking portion 13 of the elastic member 10 when the hinged door D is in a predetermined fully open state. This prevents the hinged door D from opening more than necessary, and also prevents the biasing portion 12 of the elastic member 10 from coming off the restoring force transmission member 20.

[0030] Furthermore, since the elastic member 10 is bent most when the hinged door D is in a predetermined fully open state, breakage of the bent portion is most likely to occur in this state, but even if breakage does occur, the restoring force transmission member 20 and the locking portion 13 of the elastic member 10 are in an engaged state at this time, so the urging portion 12 will not move toward the fixed portion 11. Even if the urging portion 12 moves in the opposite direction, the broken urging portion 12 will not easily come off the restoring force transmission member 20, because the distance from the restoring force transmission member 20 to the broken portion is long. In other words, even if the elastic member 10 breaks due to fatigue at the bent portion, the urging portion 12, which is the free end, will not fly off.

[0031] The door closer 1 disclosed in the present application may further include a decorative cover 30 as shown in Fig. 4. As shown in Fig. 5, this decorative cover 30 is provided on the surface D1 of the hinged door D, and integrally covers the biasing portion 12 of the elastic member 10 and the restoring force transmission member 20.

[0032] Specifically, the decorative cover 30 is open at one end 31 and at a back surface 32. In the illustrated example, the decorative cover 30 is composed of a flat rectangular top surface 33, a trapezoidal first inclined surface 35 that slopes downward from the top surface 33 toward the other end 34, and a pair of second inclined surfaces 37, 37 that slope downward from the top surface 33 toward each side edge 36, 36.

[0033] The decorative cover 30 thus constructed is attached to the surface D1 of the hinged door D by, for example, double-sided adhesive tape or adhesive at the peripheral portion of the back surface 32. Note that the means of attachment to the hinged door D is not limited to this, and for example, a flange portion may be provided on the peripheral portion excluding the open end 31, and the decorative cover 30 may be screwed to the hinged door D via this flange portion. Furthermore, the shape of the decorative cover 30 is not limited to the above example, and may be, for example, a rounded dome shape, and the size is also arbitrary as long as it is capable of integrally covering the biasing portion 12 of the elastic member 10 and the restoring force transmission member 20 as described above.

[0034] The decorative cover 30 may also serve as a restoring force transmission member in a form that directly receives the elastic restoring force of the elastic piece from the biasing portion 12 of the elastic member 10. In that case, there is no need to separately prepare the restoring force transmission member 20.

[0035] - Door closer installation and operation - The installation and operation of the door closer 1 will be described with reference to FIG.

[0036] The above door closer 1 is attached by first fixing the fixing part 11 of the elastic member 10 to a predetermined position on the inner surface F2 of the door frame F with the hinged door D open. Since the biasing part 12 is finally provided in a state of sliding contact with the surface D1 of the hinged door D, the fixing part 11 of the elastic member 10 is located at the position of the door stop S attached to the inner surface F2 of the door frame F, and the fixing part 11 is fixed to one side part F1 of the door frame F in a manner of being sandwiched between the door stop S and the inner surface F2 of the door frame F. Therefore, when attaching the door closer 1 to an existing hinged door D, the door stop S of the door frame F is temporarily removed, and the fixing part 11 of the elastic member 10 is attached to the removed position. Also, when attaching the door closer 1 to a new hinged door D, the door stop S can be attached last.

[0037] Next, when the hinged door D is closed, the biasing part 12 of the elastic member 10 suspended in the air will be aligned with the surface D1 of the hinged door D, so the restoring force transmission member 20 is attached to a predetermined position on the surface D1 of the hinged door D so as to cover the biasing part 12, and all work is now completed. Note that the installation procedure of the door closer 1 is not limited to the above example, and the fixing part 11 may be attached to the door frame F after the biasing part 12 of the elastic member 10 is temporarily fixed to the hinged door D with the restoring force transmission member 20.

[0038] When the door closer 1 is attached and the hinged door D is opened, the opening force is applied to the biasing part 12 of the elastic member 10 via the spanning part 22 of the restoring force transmission member 20, and the area between the fixed part 11 and the biasing part 12 is forcibly bent (see FIG. 6(b)). At that time, the biasing part 12 of the elastic member 10 slides on the surface D1 of the hinged door D in the spanning part 22 of the restoring force transmission member 20 while being in sliding contact with the surface D1.

[0039] When the hinged door D reaches a predetermined fully open state, the engaging portion 13 of the elastic member 10 comes into contact with one end edge of the spanning portion 22 of the restoring force transmission member 20, preventing the hinged door D from being forcibly opened any further (see FIG. 6(c)).

[0040] In this state, when the hinged door D is released from the external force (for example, by releasing the hand gripping the doorknob, or by releasing the door stopper that is provided on the floor surface and keeps the hinged door D fully open), the elastic restoring force of the elastic piece is transmitted to the hinged door D from the biasing portion 12 via the straddling portion 22 of the restoring force transmitting member 20, and as a result, the hinged door D is biased in the closing direction by the elastic restoring force. Then, when the elastic member 10 returns to its original state, the hinged door D is completely closed (see FIG. 6(a)).

[0041] <Embodiment 2> Next, another embodiment of the door closer disclosed in the present application will be described. As shown in Fig. 10, the door closer 1 illustrated here, like the door closer 1 of the above embodiment, always biases the hinged door D pivotally attached to one side part F1 of the door frame F via a hinge H in the closing direction. Note that this embodiment differs from the above embodiment only in the mounting form of the elastic member 10 to the hinged door D and the configuration of the restoring force transmission member 20, so only the differences will be described below, and the same components as those of the above embodiment will be given the same reference numerals and redundant explanations will be omitted.

[0042] The door closer 1 of this embodiment differs from the above embodiment in that, as shown in Fig. 10, the biasing part 12 of the elastic member 10 is provided in a state in which it is removably inserted into a recess D3 opened on one side surface D2 of the hinged door D. Therefore, the fixing part 11 of the elastic member 10 is located near the hinge H, away from the door stop S provided on the inner surface of the door frame F. Therefore, when attaching the door closer 1 to an existing hinged door D, there is no need to temporarily remove the door stop S of the door frame F, so the installation workability is better than that of the above embodiment.

[0043] The recess D3 formed in the hinged door D may have any size so long as it does not interfere with the biasing portion 12 of the elastic member 10, and the shape of the recess D3 may be arbitrary.

[0044] As shown in Figures 7 and 8, the restoring force transmission member 20 in this embodiment has a slit 24 that allows the insertion and removal of the biasing portion 12 of the elastic member 10, and is provided in the opening D4 of the recess D3 of the hinged door D to guide the insertion and removal posture of the elastic member 10 in the recess D3 of the hinged door D and transmit the elastic restoring force of the elastic piece to the hinged door D.

[0045] In addition, the restoring force transmission member 20 is provided at one end of the slit 24 with a removal prevention portion 25 that allows the elastic member 10 to enter the recess D3 of the locking portion 13 while preventing the locking portion 13 from removing from the recess D3.

[0046] 7, the restoring force transmission member 20 has a main body 26 that fits into the opening D4 of the recess D3 of the hinged door D, a flange portion 27 that is provided on the periphery of the main body and engages with the edge of the opening D4 of the hinged door D, a fastener insertion hole 23 through which a fastener 23a such as a screw is inserted, and a slit 24. In the illustrated example, the lower end is arc-shaped, but is not limited to this and may be symmetrical to the upper end.

[0047] 9, the length dimension is equal to or slightly greater than the dimension from the lower edge of the biasing portion 12 to the upper edge of the locking portion 13. The width dimension of the upper end portion of the slit 24 is wider than other portions, and a removal prevention portion 25 is provided on the upper edge.

[0048] As described above, the removal prevention portion 25 allows the locking portion 13 to enter the recess D3 while preventing the locking portion 13 from being removed from the recess D3. In this embodiment, the removal prevention portion 25 is configured as a flexible inclined piece that is inclined from the upper edge of the slit 24 toward the inside of the recess D3, but is not limited to this. The material of the removal prevention portion 25 may be any material that can provide the configuration for the removal prevention portion 25 to perform the above-mentioned function, and may be either metal or synthetic resin.

[0049] - Door closer installation and operation - To install the door closer 1 of this embodiment, first, an opening D4 is formed on one side surface D2 of the hinged door D, and the biasing portion 12 of the elastic member 10 is inserted into the slit 24 of the restoring force transmission member 20. Next, the hinged door D is opened, and the biasing portion 12 protruding from the back side of the restoring force transmission member 20 is inserted into the opening D4 of the hinged door D, and then the flange portion 27 of the restoring force transmission member 20 is brought into contact with the edge of the opening D4, and in this state, a fixing tool 23a such as a screw is inserted through the fixing tool insertion hole 23 to fix the restoring force transmission member 20 to the opening D4. Finally, the fixing portion 11 of the elastic member 10 is fixed to the inner surface F2 of the door frame F, and all the work is completed. The installation procedure for the door closer 1 is not limited to the above example. The fixing portion 11 of the elastic member 10 may be attached to the door frame F first, and then the biasing portion 12 of the elastic member 10 may be inserted into the slit 24 of the restoring force transmission member 20, and in this state the biasing portion 12 may be inserted into the opening D4, and the restoring force transmission member 20 may be fixed to the opening D4.

[0050] When the installation of the door closer 1 is completed and the hinged door D (see FIG. 10(c)) in the fully open state is released from the external force, the elastic restoring force of the elastic piece is transmitted to the hinged door D from the biasing part 12 through the slit 24 of the restoring force transmitting member 20, and as a result, the hinged door D is biased in the closing direction by the elastic restoring force (see FIG. 10(b)). Then, when the elastic member 10 returns to its original state, the hinged door D is completely closed (see FIG. 10(a)).

[0051] <Embodiment 3> Next, still another embodiment of the door closer disclosed in the present application will be described with reference to Figures 11 to 15. The door closer 1 illustrated here differs from the above-described embodiment 2 only in the shape of the fixing part 11 of the elastic member 10 and the fixing means of the fixing part 11 to the door frame F, so only the differences will be described below, and the same components as those in the above-described 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 always biases the hinged door D pivotally attached to one side part F1 of the door frame F via a hinge H in the closing direction.

[0052] In the above-mentioned embodiments 1 and 2, the fixing portion 11 of the elastic member 10 is formed by bending one end of the elastic piece, but in the present embodiment, one end of the elastic piece is left straight without being bent, and an anchor member 40 described below is attached to that portion.

[0053] As shown in Figure 15, the anchor member 40 is embedded in the inner surface F2 of the door frame F via its main body portion 41, and fixes the fixing portion 11 of the elastic member 10 within a recess opening into the inner surface F2 of the door frame F.

[0054] In this anchor member 40, a slit 42 into which the fixing portion 11 of the elastic member 10 is inserted is opened on one end surface of the main body 41, and a mounting recess 43 communicating with the slit 42 is provided on one side surface of the main body 41. One opening edge 44 of the slit 42 is chamfered in a curved shape. As a result, as shown by the two-dot chain line in FIG. 14, the bending movement of the elastic member 10 accompanying the opening and closing movement of the hinged door D is not hindered by the opening edge 44, and the elastic member 10 is not damaged by the opening edge 44 every time the bending movement is performed. In addition, the slit 42 and the mounting recess 43 are formed so that the elastic member 10 does not protrude vertically from one end surface of the main body 41, but is slightly inclined in a direction away from the opening edge 44 as shown in FIG. 14. As a result, even when the hinged door D reaches a closed state, the elastic restoring force of the elastic member 10 acts on the hinged door D, although it is small, so that the hinged door D can be closed reliably.

[0055] The fixing portion 11 of the elastic member 10 is inserted into the anchor member 40 from the slit 42 side, and is fixed in the mounting recess 43 of the main body 41 by fasteners 45, 45 such as screws and nuts. The anchor member 40 thus constructed is embedded in an anchor mounting hole of a door frame F formed in a shape into which the main body 41 can be fitted, as shown in Fig. 15, and is fixed to the anchor mounting hole of the door frame F by inserting fasteners 48 such as screws into a pair of fastener insertion holes 46, 46 formed in the main body 41. Here, the length of the screws 45a of the fasteners 45, 45 is contained within the thickness dimension of the main body 41 so that the fasteners 45, 45 do not protrude from the surface opposite the mounting recess 43, and the size of the heads does not protrude outward from the mounting recess 43 to the main body 41. In addition, the nuts 45b of the fixing devices 45, 45 are also embedded in a recess (not shown) formed on the surface opposite to the mounting recess 43 so as not to protrude outward from the mounting recess 43 to the body part 41. This prevents the fixing devices 45, 45 from interfering with the insertion of the body part 41 into the anchor mounting hole of the door frame F. Furthermore, in this embodiment, when mounting the door closer 1 to the door frame F and the hinged door D, when the elastic member 10 with the anchor member 40 attached to the fixing part 11 is inserted into the slit 24 of the restoring force transmission member 20, the restoring force transmission member 20 is attached to the opening D4 of the hinged door D, and then the anchor member 40 is embedded in the anchor mounting hole of the door frame F, it is difficult to make the body part 41 of the anchor member 40 face the anchor mounting hole of the door frame F because of the elastic restoring force of the elastic member 10, and the body part 41 is inevitably inclined with respect to the anchor mounting hole of the door frame F. For this reason, when attempting to insert the main body 41 into the anchor mounting hole of the door frame F, one corner of the main body 41 interferes with the open end of the recess, making insertion difficult. Therefore, in this embodiment, the corner on the mounting recess 43 side is chamfered 49. This makes the mounting work easier. Reference numeral 47 in the figure indicates a flange portion formed on the outer periphery of one end face of the main body 41, which engages with the open edge of the anchor mounting hole of the door frame F. The form of the anchor member 40 is not limited to that shown in the example, and may be any form as long as it can fix the fixing portion 11 of the elastic member 10 within the anchor mounting hole of the door frame F.

[0056] The installation of the door closer 1 in this embodiment is the same as that of embodiment 2, except that the method of attaching the fixing portion 11 of the elastic member 10 to the door frame F is as described above, and the operation is also the same as embodiment 2.

[0057] The anchor member 40 of the door closer 1 according to this embodiment is of course applicable to the first embodiment as well.

[0058] <Embodiment 4> Next, still another embodiment of the door closer disclosed in the present application will be described with reference to Figs. 16 to 18. The door closer 1 illustrated here has the same basic configuration as the above-mentioned embodiment 3, but differs from the embodiment in the presence or absence of a cover part 29 covering the elastic member 10, the locking part 13 of the elastic member 10, and the removal prevention part 25 of the restoring force transmission member 20, and the shape of the main body 26 of the restoring force transmission member 20. Therefore, only the differences will be described below, and the same components as those in the above-mentioned embodiment will be given the same reference numerals and redundant description will be omitted. Note that, like the door closer 1 of the above-mentioned embodiment, the door closer 1 of this embodiment also biases the hinged door D pivotally attached to one side part F1 of the door frame F via a hinge H in a direction to always close the door.

[0059] In the above-mentioned embodiment 3, the elastic member 10 was in direct contact with the inner surface of the recess D3 of the hinged door D, but in this embodiment, the restoring force transmission member 20 is provided with a cover portion 29 that covers both sides of the elastic member 10, so that the elastic member 10 does not come into direct contact with the inner surface of the recess D3.

[0060] The cover part 29 is a strip-shaped plate piece having the same width as the elastic member 10 or a width slightly wider, folded back so as to be curved at the center in the longitudinal direction, and both ends are attached by adhesion, welding, or the like to the stepped parts formed on both sides of the main body 26 of the restoring force transmission member 20. This cover part 29 may be made of metal or synthetic resin. Such a cover part 29 is intended to make the sliding action of the elastic member 10 accompanying the opening and closing of the hinged door D smoother. Therefore, the cover part 29 does not need to cover both sides of the elastic member 10, and it is sufficient that the cover part 29 covers at least the surface of the elastic member 10 on the biasing direction side. In addition, in the case of the restoring force transmission member 20 having this cover part 29, it is not necessary to make the inner surface of the recessed part D3 of the hinged door D smooth so that the surface does not hinder the sliding of the elastic member 10, so that the processing of the recessed part D3 is easy and the workability is improved.

[0061] -Door closer installation tool and installation method- Next, a mounting jig used in the mounting work of the door closer 1 of the above-mentioned embodiment 4 and a mounting method using the same will be described.

[0062] [Mounting fixture] First, as shown in Figures 19 and 20, the mounting jig 50 has mounting parts 51, 51 at both upper and lower ends, and these mounting parts 51, 51 are integrated at one side by a bridge part 52. The other side of the bridge part 52 is an open part 53 to avoid interference with the elastic member 10 of the door closer 1.

[0063] A first engagement protrusion 54, 54 is provided on one surface of the mounting portion 51, 51, and a second engagement protrusion 55, 55 is provided on the other surface. The first engagement protrusion 54, 54 is provided so that its position and shape correspond to the fastener insertion hole 46, 46 formed in the main body 41 of the anchor member 40. On the other hand, the second engagement protrusion 55, 55 is provided so that its position and shape correspond to the fastener insertion hole 23, 23 formed in the main body 26 of the restoring force transmission member 20. The height of the first engagement protrusion 54, 54 is set to a height that can be fitted into the fastener insertion hole 46, 46 of the anchor member 40. On the other hand, the height of the second engagement protrusion 55, 55 is set to a height that matches the immersion depth of the head of the fastener 23a in the seat bore of the fastener insertion hole 23, 23 of the restoring force transmission member 20.

[0064] The thickness of the mounting jig 50 as described above is approximately equal to the gap formed between the main body 26 of the restoring force transmission member 20 and the main body portion 41 of the anchor member 40 when the hinged door D is in the closed state, as shown by the symbol L in Figure 18(a).

[0065] The above-mentioned mounting jig 50 is preferably made of synthetic resin having elastic restoring force. In this case, the first engaging protrusions 54, 54 elastically engage with the fastener insertion holes 46, 46 of the anchor member 40, and the second engaging protrusions 55, 55 elastically engage with the fastener insertion holes 23, 23 of the restoring force transmission member 20, respectively, so that it is possible to prevent the mounting jig 50 from accidentally falling off when the door closer 1 is installed.

[0066] In the above embodiment, the restoring force transmitting member 20 and the anchor member 40 are temporarily fixed to each other by utilizing the concave-convex engagement between the first and second engaging protrusions 54, 55 and each of the fastener insertion holes 46, 23. However, it is also possible to form dedicated engaging holes in each of the members 20, 40 for engaging with the first and second engaging protrusions 54, 55 without using the fastener insertion holes 46, 23. Alternatively, instead of using such concave-convex engagement, the restoring force transmitting member 20 and the anchor member 40 may be magnetically attached by forming the mounting jig 50 from a magnet and forming the same from a magnetic material.

[0067] [Installation method] Next, a method for installing the door closer 1 will be described with reference to FIG.

[0068] First, as a preliminary step, a recess D3 is formed in a predetermined position of the hinged door D, and an anchor attachment hole G for fitting the anchor member 40 into the inner surface F2 of one side portion F1 of the door frame F is formed.

[0069] As shown in FIG. 21(a), the cover portion 29 of the restoring force transmission member 20 is inserted into the recess D3 of the hinged door D, and as shown in FIG. 21(b), the main body 26 of the restoring force transmission member 20 is fixed to the opening D4 of the hinged door D with the fastener 23a.

[0070] Next, as shown in FIG. 21( c ), the elastic member 10 is inserted into the cover portion 29 of the restoring force transmission member 20 .

[0071] Next, as shown in Figure 21 (d), in the final stage of inserting the elastic member 10, the mounting jig 50 is inserted between the main body 26 of the restoring force transmission member 20 and the anchor member 41 of the anchor member 40, and the first engagement protrusions 54, 54 of the mounting jig 50 are engaged with the fastener insertion holes 46, 46 of the anchor member 40, while the second engagement protrusions 55, 55 are engaged with the fastener insertion holes 23, 23 of the restoring force transmission member 20, thereby connecting the anchor member 40 to the restoring force transmission member 20 and temporarily fixing both 20, 40 together.

[0072] After the temporary fixing is completed, the hinged door D is closed and the anchor member 40 is fitted into the anchor mounting hole G of the door frame F as shown in FIG. 21(e).

[0073] Next, as shown in FIG. 21(f), the hinged door D is slowly opened, and the mounting jig 50 is removed while holding the anchor member 40 against the door frame F with fingertips or the like to prevent the anchor member 40 from accidentally falling out of the anchor mounting hole G.

[0074] Finally, as shown in FIG. 21(g), while the hinged door D is kept in the open state, the anchor member 40 is fixed with the fixture 48, and the installation work of the door closer 1 is now completed.

[0075] According to the above-mentioned mounting method, it is possible to further improve the workability in the mounting method described in embodiment 3. That is, in embodiment 3, when taking a procedure such as embedding the anchor member 40 in the anchor mounting hole of the door frame F, it is difficult to directly face the main body 41 of the anchor member 40 to the anchor mounting hole of the door frame F because of the elastic restoring force of the elastic member 10, and there is a difficulty in workability in that the main body 41 inevitably takes an inclined posture with respect to the anchor mounting hole of the door frame F. However, by using the mounting jig 50, it is possible to mount the main body 41 of the anchor member 40 in the anchor mounting hole G with a simple operation such as closing the hinged door D.

[0076] In the above-mentioned mounting method, the main body 41 of the anchor member 40 rotates around the hinge H of the hinged door D inside the anchor mounting hole G. Therefore, if the inner shape of the anchor mounting hole G is made the same as the outer shape of the main body 41 of the anchor member 40, as shown by the filled-in area in Figure 22(a), the inner surface of the anchor mounting hole G on the door stop S side and the corners of the main body 41 of the anchor member 40 will interfere with each other. However, this interference cannot be avoided simply by forming the chamfer 49 as explained in embodiment 3 on the main body 41 of the anchor member 40.

[0077] Therefore, in this embodiment, in addition to forming the chamfer 49 on the main body 41 of the anchor member 40, the anchor mounting hole G is modified as shown in Fig. 22(b) and Fig. 23. That is, as shown by the symbol K in the figures, the area of ​​the inner surface of the anchor mounting hole G on the door stop S side that overlaps with the turning trajectory of the main body 41 of the anchor member 40 is cut and enlarged. This, together with forming the chamfer 49 on the main body 41 of the anchor member 40, prevents interference between the inner surface of the anchor mounting hole G on the door stop S side and the corners of the main body 41 of the anchor member 40 when the hinged door D is closed and the main body 41 of the anchor member 40 is fitted into the anchor mounting hole G.

[0078] Incidentally, in the installation method described above, in the step shown in Figure 21(f), the hinged door D is slowly opened, and the installation jig 50 is removed while holding the anchor member 40 toward the door frame F with fingertips or the like to prevent the anchor member 40 from accidentally falling out of the anchor mounting hole G. However, by taking measures such as those shown in Figures 24 and 25, for example, it is possible to eliminate the risk of the anchor member 40 accidentally falling out of the anchor mounting hole G even if the anchor member 40 is not held down with fingertips or the like, and the ease of installation can be further improved.

[0079] 24, a number of sawtooth-shaped protrusions 40a are formed along the width direction of the elastic member 10 in the front and back sides of the anchor member 40 in the areas that contact the inner surface of the anchor mounting hole G. This increases the friction between the front and back sides of the anchor member 40 and the inner surface of the anchor mounting hole G, eliminating the risk of the anchor member 40 accidentally coming out of the anchor mounting hole G when the hinged door D is opened. Note that the means for increasing the friction between the front and back sides of the anchor member 40 and the inner surface of the anchor mounting hole G is not limited to the sawtooth-shaped protrusions 40a shown in this example, and may be uneven in any shape, or may not be processed in this way on the anchor member 40, and may instead be, for example, an adhesive tape that provides friction.

[0080] 25, an engagement groove 40b is provided on the front surface of the anchor member 40, and a hook member 60 having a hook 61 that engages with the engagement groove 40b is prepared. The hook member 60 is fixed in the anchor mounting hole G, and the engagement groove 40b and the hook 61 are engaged to prevent the anchor member 40 from accidentally coming off the anchor mounting hole G. That is, the base 62 of the hook member 60 is fixed to the bottom surface of the anchor mounting hole G by a fastener such as a screw through a mounting tool insertion hole 63 formed in the base 62. Then, when the anchor member 40 is inserted into the anchor mounting hole G in this state, the hook 61 is pushed by the outer surface on the front side of the anchor member 40 and elastically deforms outward. When the engagement groove 40b of the anchor member 40 reaches the engagement claw 61a at the tip of the hook 61, the elastic restoring force of the hook 61 engages the engagement groove 40b with the engagement claw 61a. The configurations of the engagement groove 40b of the anchor member 40 and the hook member 60 are not limited to the above examples.

[0081] 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 being limited. The scope of the present invention is indicated by the claims and is not restricted by the descriptions in the specification and drawings. Furthermore, all modifications and changes within the scope of the claims are within the scope of the present invention.

[0082] In the above embodiment, a single hinged door pivotally attached to one side of the door frame via a hinge is used as an example, but the present invention is not limited to such a hinged door and can also be applied to a folding door. Also, in the above embodiment, the pivot axis of the hinged door is vertical, but the present invention can also be applied to a door with a horizontal pivot axis, such as a trapdoor.

[0083] In some of the drawings, the elastic member 10 formed by superimposing two rectangular elastic pieces 10a, 10b is depicted as if it were a single piece, but this is merely for the sake of ease of viewing the drawings. [Explanation of symbols]

[0084] 1 Door closer 10 Elastic member 11 Fixed part 12. Pressurizing section 13 Locking part 14 Fixture insertion hole 20 Restoring force transmission member 21 Pedestal 22 Straddle 23 Fixture insertion hole 23a Fixtures 24 Slit 25 Removal prevention part 26 Main unit 27 Flange 28 Common-law marriage 29 Cover part 30 Makeup Cover 31 one end 32 Back 33 Top surface 34 Other end 35 First Slope 36 Side edge 37 Second Slope 40 Anchor member 40a protrusion 40b Engagement groove 41 Main body 42 Slit 43 Mounting recess 44 One opening edge of the slit 45 Fixtures 46 Fixture insertion hole 47 Flange 48 Fixtures 49 Chamfering 50 Mounting jig 51 Mounting part 52 Bridge section 53 Open area 54 1st engagement protrusion 55 Second engagement protrusion 60 Hook member 61 Hook 61a Engagement claw 62 Base 63 Mounting tool insertion hole D Swing door D1 surface D2 one side D3 Concave D4 Aperture F door frame F1 One side F2 Inner surface G Anchor mounting hole H hinge S Door Stop

Claims

1. A door closer that always biases a swing door pivotally attached to one side of a door frame in a closing direction, The elastic member is composed of at least two overlapping rectangular elastic pieces, one end of which is a fixed part that is fixed to the one side of the door frame, while the other end of the elastic piece is a free end that is in sliding contact with the surface of the hinged door and always biases the hinged door in the closing direction by the elastic restoring force of the elastic piece; A restoring force transmission member that is attached to the hinged door so as to straddle the biasing portion and transmits the elastic restoring force of the elastic piece to the hinged door; A door closer comprising:

2. 2. The door closer according to claim 1, a locking portion is provided at a tip portion of the free end of the elastic member, the locking portion protruding in a direction intersecting with a longitudinal direction of the elastic member; A door closer characterized in that the restoring force transmission member engages with the locking portion when the hinged door is in a predetermined fully open state.

3. The door closer according to claim 1 or 2, The door closer further comprises a decorative cover provided on the surface of the hinged door and integrally covering the biasing portion of the elastic member and the restoring force transmission member.

4. A door closer that always biases a swing door pivotally attached to one side of a door frame in a closing direction, The elastic member is composed of at least two overlapping rectangular elastic pieces, one end of which is a fixed part that is fixed to the one side of the door frame, while the other end of the elastic piece 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 a closing direction; a restoring force transmission member having a slit for allowing insertion and removal of the biasing portion of the elastic member, provided at an 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; A door closer comprising:

5. The door closer according to claim 4, a locking portion is provided at a tip portion of the free end of the elastic member, the locking portion protruding in a direction intersecting with a longitudinal direction of the elastic member; A door closer characterized in that the restoring force transmission member has a removal prevention portion at one end of the slit that allows the locking portion to enter the recess while preventing the locking portion from being removed from the recess.

6. The door closer according to claim 4, A door closer characterized in that the restoring force transmission member has a cover portion that can be inserted into the recess of the hinged door and covers at least the surface of the elastic member on the biasing direction side.

7. A door closer according to any one of claims 1, 2, 4, 5 and 6, A door closer further comprising an anchor member attached to the fixing portion of the elastic member and embedded in an inner surface of one side of the door frame.

8. A method for mounting a door closer according to claim 7, which refers to any one of claims 4, 5 and 6, a step of fixing the restoring force transmission member to an opening of the recess of the hinged door in an open state; A step of inserting the elastic member into the recess of the hinged door via the restoring force transmission member, and temporarily fixing the anchor member to the restoring force transmission member via a mounting jig that is detachable from both members; a step of closing the hinged door while maintaining the provisionally fixed state, and embedding the anchor member in the inner surface of one side of the door frame; After confirming that the embedding is completed, a step of opening the hinged door while holding down the anchor member to maintain the embedded state and removing the mounting jig; Fixing the anchor member to one side of the hinged door; A method for installing a door closer, comprising:

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