JP7576369B2 - Door closer - Google Patents

Description

The present invention relates to a door closer.

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 exerts on the door, thereby controlling the speed at which the door closes (see, for example, Patent Document 1).

The door checkers described above are attached to the upper edge of the door, but the body containing the cylinder, spring, etc. tends to be large, and they also have a bent arm that connects to the door frame and protrudes significantly from the surface of the door. Although they are above eye level, they are noticeable and often detract from the design of the door and the atmosphere around the entrance. In addition, the mechanism is complex, making them expensive, tedious to install on the door and door frame, and troublesome to adjust the speed at which the door closes.

As a solution to these problems with conventional door checkers, for example, Patent Document 2 discloses a method of fixing a plate-shaped elastic body to the support material between the hinges of a gate, and abutting the surface of this plate-shaped elastic body against the back surface of the gate, so that the gate is automatically closed by the elastic force of the plate-shaped elastic body.

Japanese Unexamined Patent Publication No. 55-152282 Japanese Utility Model Application Publication No. 2-71800

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, although it is beneficial in terms of increasing the shielding properties of gates that are installed exclusively outdoors, it is too large to be used on indoor doors, and as with conventional door checkers, it detracts from the design of the door and the atmosphere around the entrance and exit, and therefore could not be adopted.

In addition, because the plate-shaped elastic body is repeatedly bent at specific points as the door is opened and closed, there is a risk that the bent points will break due to fatigue. If breakage occurs, the free end of the plate-shaped elastic body will jump in an unexpected direction due to the elasticity of the plate-shaped elastic body itself, as it is simply in contact with the surface of the gate. As a result, if anyone is nearby, there is a risk of injury.

The present invention was made to solve the above problems, and its purpose is to provide a door closer that, when used on a door, does not impair the design of the door or the atmosphere around the entrance. Another purpose of the present invention is to provide a door closer that is safe and will not fly around even if the bent part breaks.

In order to solve the above problems, the door closer disclosed in the present application is a door closer that constantly biases a swing door pivotally attached to one side of a door frame via a hinge in a direction to close, and is composed of a rectangular elastic piece, 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 swing door and serves as a biasing part that constantly biases the swing door in a direction to close; The door frame has a hinged door that has a slit that allows the elastic portion of the elastic member to be inserted and removed, and is provided at the opening of the recess of the hinged door, guiding the insertion and removal position 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 an anchor member that is attached to the fixing portion of the elastic member and embedded in the inner surface of one side of the door frame, wherein the anchor member has a slit on one end surface of its main body into which the fixing portion of the elastic member is inserted, and a mounting recess that communicates with the slit is provided on one side of the main body, one opening edge of the slit is chamfered into a curved shape, and the slit and the mounting recess are formed so that the elastic member is slightly inclined in the direction away from the opening edge .

In the above door closer, a locking portion is provided at the tip of the free end of the elastic member, protruding in a direction intersecting the longitudinal direction 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 but prevents the locking portion from being removed from the recess.

The door closer disclosed in this application does not impair the design of the door or the atmosphere around the entrance, and is also very safe, since even if the bent part breaks, it will not fly around.

1A, 1B, and 1C are diagrams illustrating an elastic member in one embodiment of a door closer disclosed herein, where FIG. 1A to 1D are diagrams illustrating a restoring force transmission member in one embodiment of a door closer disclosed herein, where FIG. 1A is a plan view, FIG. 1B is a front view, FIG. 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 . 1A to 1D are diagrams illustrating a decorative cover in one embodiment of a door closer disclosed herein, where FIG. 1A is a plan view, FIG. 1B is a front view, FIG. FIG. 5 is a schematic diagram showing an attached state of the decorative cover shown in FIG. 4 . 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 in a closed state, (b) shows the swing door in the middle of opening or closing, and (c) shows the swing door in a fully open state. 13 is a perspective view illustrating a restoring force transmission member in another embodiment of a door closer disclosed herein. FIG. 8A is a plan view of the restoring force transmission member shown in FIG. 7, FIG. 8B is a front view, FIG. 8C is a side view, and FIG. 8D is a central vertical cross-sectional view. 8 is a schematic cross-sectional view showing an engagement state between a detachment prevention portion of the restoring force transmission member shown in FIG. 7 and a locking portion of the elastic member. FIG. 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. 13 is a perspective view illustrating an elastic member in still another embodiment of the door closer disclosed herein. FIG. FIG. 12 is an exploded perspective view of the elastic member shown in FIG. 11 . FIG. 12 is a front view of the elastic member shown in FIG. 11 . 14 is a partial cross-sectional view taken along line AA in FIG. 13. FIG. 12 is a perspective view showing an attached state of the elastic member shown in FIG. 11 .

The following describes embodiments of the present invention 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 components that are common to the following descriptions and drawings.

<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 a closing direction, as shown in FIG.

Specifically, as shown in Figures 1 and 2, the door closer 1 includes an elastic member 10 and a restoring force transmission member 20.

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 exerts a predetermined elastic restoring force and is resistant to fatigue failure is suitable. One end of the elastic piece is bent and fixed to one side F1 of the door frame F as a fixed part 11. Meanwhile, the other end of the elastic piece is a free end and serves as a biasing part 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 part 11 is provided with fixing device insertion holes 14, 14 through which a fixing member such as a screw is inserted.

The elastic member 10 thus formed has its original shape in the state where the one end is bent, and when the fixed part 11 and the biasing part 12 are forcibly deformed from this state in the direction in which they open, an elastic restoring force corresponding to the degree of deformation is generated, and the biasing part 12 tries to return to its original shape. This elastic restoring force is appropriately set to a value according 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 will close quickly but the impact sound when closing will be louder, and if it is too small, the hinged door D will close slowly, suppressing the impact sound but taking time to close, which may increase the movement of air between the inside and outside of the hinged door D and, for example, cause adverse effects on air conditioning. In the illustrated example, the angle between the fixed 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 will gradually decrease 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 slightly, so that the hinged door D is pressed against the door stopper S and can be closed reliably.

The elastic member 10 is provided at the tip of its free end with a locking portion 13 that protrudes in a direction intersecting 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 opposing 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 polygonal shape, or any other shape. The locking portion 13 is not essential, and may not be provided at all.

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.

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 that is 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 device insertion hole 23, 23 formed in a position that is 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.

In addition, in this embodiment, when the hinged door D is in a predetermined fully open state, the restoring force transmission member 20 is engaged at one end edge with the locking portion 13 of the elastic member 10 as shown in FIG. 3. In this case, the restoring force transmission member 20 is disposed at a position where it abuts against 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.

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. Even if breakage does occur, the restoring force transmission member 20 and the locking portion 13 of the elastic member 10 are engaged at this time, so the biasing portion 12 will not move toward the fixed portion 11. Even if the biasing portion 12 moves in the opposite direction, the distance from the restoring force transmission member 20 to the broken portion is long, so the broken biasing portion 12 will not easily come off the restoring force transmission member 20. In other words, even if the elastic member 10 breaks due to fatigue at the bent portion, the biasing portion 12, which is the free end, will not fly off.

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.

Specifically, the decorative cover 30 is open at one end 31 and at the back 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.

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 periphery 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 periphery excluding the open end 31, and the decorative cover 30 may be screwed to the hinged door D via this flange portion. In addition, 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 can integrally cover the biasing portion 12 of the elastic member 10 and the restoring force transmission member 20 as described above.

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 prepare a separate restoring force transmission member 20.

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

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 ultimately 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 that it is 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 can be temporarily removed, and the fixing part 11 of the elastic member 10 can be 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.

Next, when the hinged door D is closed, the biasing portion 12 of the elastic member 10, which is suspended in the air, will fit along 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 portion 12, and all work is now complete. Note that the installation procedure for the door closer 1 is not limited to the above example, and the biasing portion 12 of the elastic member 10 may be temporarily fixed to the hinged door D with the restoring force transmission member 20, and then the fixing portion 11 may be attached to the door frame F.

Now that the door closer 1 is installed, as 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, forcing the area between the fixed part 11 and the biasing part 12 to bend (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 within the spanning part 22 of the restoring force transmission member 20 while in sliding contact with the surface D1.

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

In this state, when the swing 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 attached to the floor surface and keeps the swing door D fully open), the elastic restoring force of the elastic piece is transmitted from the biasing portion 12 to the swing door D via the straddling portion 22 of the restoring force transmission member 20, and as a result, the swing 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 swing door D is completely closed (see FIG. 6(a)).

<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 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.

As shown in FIG. 10, the door closer 1 of this embodiment differs from the above embodiment in that the biasing portion 12 of the elastic member 10 is removably inserted into a recess D3 opened on one side D2 of the hinged door D. Therefore, the fixing portion 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 first remove the door stop S of the door frame F, making the installation easier than in the above embodiment.

The recess D3 in the hinged door D can have any size and shape as long as it does not interfere with the biasing portion 12 of the elastic member 10.

As shown in Figures 7 and 8, the restoring force transmission member 20 in this embodiment has a slit 24 that allows the biasing portion 12 of the elastic member 10 to be inserted and removed, and is provided in the opening D4 of the recess D3 of the hinged door D, guiding the insertion and removal position of the elastic member 10 in the recess D3 of the hinged door D and transmitting the elastic restoring force of the elastic piece to the hinged door D.

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.

Specifically, as shown in FIG. 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 provided on the periphery of this main body and engaging with the edge of the opening D4 of the hinged door D, a fastener insertion hole 23 through which a fastener such as a screw is inserted, and a slit 24. Note that in the illustrated example, the lower end is arc-shaped, but this is not limited thereto and may be symmetrical to the upper end.

The width of the slit 24 is large enough to allow the biasing portion 12 of the elastic member 10 to be inserted and removed, and as shown in FIG. 9, the length is equal to or slightly larger than the length from the lower edge of the biasing portion 12 to the upper edge of the locking portion 13. The width of the upper end of the slit 24 is wider than other portions, and a removal prevention portion 25 is provided at the upper edge.

As described above, this 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 slopes 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 either metal or synthetic resin as long as it can be configured to allow the removal prevention portion 25 to perform the function described above.

- 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 member 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 operations are 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, 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.

When the door closer 1 is installed and the hinged door D (see FIG. 10(c)) is released from the external force in the fully open state, the elastic restoring force of the elastic piece is transmitted from the biasing portion 12 to the hinged door D via the slit 24 of the restoring force transmission 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)).

<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-mentioned 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-mentioned embodiment will be given the same reference numerals and redundant explanations will be omitted. Note that, like the door closer 1 of the above-mentioned 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.

In the above-mentioned first and second embodiments, the fixing portion 11 of the elastic member 10 is formed by bending one end of the elastic piece, but in this embodiment, the one end of the elastic piece is left straight without bending, and the anchor member 40 described below is attached to that portion.

As shown in FIG. 15, the anchor member 40 is embedded in the inner surface F2 of the door frame F via its main body 41, and fixes the fixing portion 11 of the elastic member 10 in a recess that opens into the inner surface F2 of the door frame F.

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 this opening edge 44, and the elastic member 10 is not damaged by this 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 if 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.

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 is embedded in a recess of the door frame F formed in a shape that allows the main body 41 to be fitted, as shown in Figure 15, and is fixed to the recess 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 on the opposite side of 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 main body 41. This prevents the fixing devices 45, 45 from interfering with the insertion of the main body 41 into the recess of the door frame F. Furthermore, in this embodiment, when attaching 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 portion 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 recess of the door frame F, it is difficult to directly face the main body 41 of the anchor member 40 to the recess of the door frame F because of the elastic restoring force of the elastic member 10, and the main body 41 is inevitably inclined with respect to the recess of the door frame F. For this reason, when attempting to insert the main body 41 into the recess of the door frame F, one corner of the main body 41 interferes with the opening edge of the recess, making insertion difficult. Therefore, in this embodiment, the corner on the mounting recess 43 side is chamfered 49. This makes the installation work easier. Reference numeral 47 in the figure indicates a flange portion formed on the outer peripheral edge of one end face of the main body 41, which engages with the opening edge of the recess of the door frame F. The shape of the anchor member 40 is not limited to the example shown in the figure, and is arbitrary as long as it can fix the fixing portion 11 of the elastic member 10 within the recess of the door frame F.

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

The anchor member 40 of the door closer 1 according to this embodiment can of course also be applied to embodiment 1.

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 restrictive. The scope of the present invention is indicated by the claims and is not bound by the descriptions in the specification and drawings. Furthermore, all modifications and changes within the equivalent scope of the claims are within the scope of the present invention.

1 Door closer 10 Elastic member 11 Fixing portion 12 Pressing portion 13 Locking portion 14 Fixing device insertion hole 20 Restoring force transmission member 21 Base portion 22 Spanning portion 23 Fixing device insertion hole 24 Slit 25 Removal prevention portion 26 Main body 27 Flange portion 28 Inner edge 30 Decorative cover 31 One end 32 Back surface 33 Top surface 34 Other end 35 First inclined surface 36 Side edge 37 Second inclined surface 40 Anchor member 41 Main body portion 42 Slit 43 Mounting recess 44 One opening edge portion of the slit 45 Fixing device 46 Fixing device insertion hole 47 Flange portion 48 Fixing device 49 Chamfer D Swing door D1 Surface D2 One side surface D3 Recess D4 Opening F Door frame F1 One side portion F2 Inner surface H Hinge S Door stop

Claims (2)

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 made of a rectangular elastic piece, 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;
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;
Equipped with
The anchor member has a slit on one end surface of its main body into which the fixing portion of the elastic member is inserted, and a mounting recess communicating with the slit is provided on one side surface of the main body, one opening edge of the slit is chamfered into a curved shape, and the slit and the mounting recess are formed so that the elastic member is slightly inclined in a direction away from the opening edge.
A door closer characterized by the above. 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 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.

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