Door body closing device

Abstract

To provide a door body closing device capable of securely closing a door body without leaving it half-open.SOLUTION: A swing-door type door body closing device 1, which includes a main body 100 and a latching device 200, is configured such that the main body 100 includes a case 110, an arm 120, a cam member 130, a square shaft 140, a biasing member 150, and a buffer member 160. The biasing member 150 and the buffer member 160 are arranged, with the cam member 130 interposed therebetween, within the case 110. When the arm 120, engaged with the latching device 200, rotates from an open position to a closed position, the biasing member 150 extends at an initial stage of the rotation to bias the cam member 130 to rotate, and the buffer member 160 contracts to buffer the rotation of the cam member 130. However, when the arm 120 reaches a specified angle θ and an acting surface 163 of the buffer member 160 overcomes a protrusion of the cam member 130, the rotation speed of the arm 120 increases.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a closing device for a hinged door body, and is particularly suitable for a door body that requires reliable closing.

Background Art

[0002] Conventionally, in building fixtures such as doors of buildings, closing devices for closing door bodies have been used. In building fixtures, for example, the inventions described in Japanese Patent Application Laid-Open No. 2020-133210 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2021-080812 (Patent Document 2) are known.

[0003] The closing devices for door bodies of these conventional inventions include a buffer member (damper), a biasing member (spring), and an arm. In the closing process when manually closing a hinged door body, the door body side and the door frame side are engaged by the rotating arm, and while the buffer member buffers an excessive force in the closing direction, the biasing member applies a sufficient force in the closing direction to close the door body for closing.

[0004] In order to further buffer an excessive force in the closing direction, for example, like the invention described in Japanese Patent Application Laid-Open No. 2014-101652 (Patent Document 3), on the catcher (locking device) side, there are a retracting passage and a valve body biased by a coil spring, and an invention is known in which when an excessive force in the closing direction is applied during closing of the door body, the striker is introduced into the retracting passage to buffer it.

[0005] Also, the applicants of the present application have previously filed and patented an invention related to a door closer (a closing device for a door body) that can buffer and absorb the force even when the door body is closed vigorously by devising the closing guide plate (locking device) side, and prevent accidents such as finger pinching (Japanese Patent No. 6114650, Patent Document 4).

[0006] However, the door closing device of the conventional invention described above closes the door by the force of the biasing member (spring). However, for example, in the case of a hinged door with the weight of the door or a hinged door equipped with a latch bolt, due to being obstructed by such resistance, the biasing force in the closing direction is insufficient, and there is a risk that the hinged door will remain half-open.

[0007] Further, for example, in the case of a door that requires reliable closing, such as the door of a refrigerator, a mechanism that can clearly recognize that the closing has been completed is necessary.

[0008] When the door is half-open, the effects such as the air-conditioning function, sound insulation function, and prevention of cold air leakage of the door cannot be fully exerted. Therefore, there has been a demand for a door closing device that can reliably close the door and can recognize that the closing has been completed.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0010] An object of the present invention is to provide a door closing device that enables reliable closing without remaining half-open.

Means for Solving the Problems

[0011] The closing device for a door body, which is the invention made to solve the above problems, is a closing device for a hinged door body comprising a main body and a locking member. The main body consists of a case, an arm, a cam member, a corner shaft, a biasing member, and a buffer member. The corner shaft is rotatably fixed to the case, and the cam member and the corner shaft are engaged so as to rotate integrally. The biasing member and the buffer member are arranged in the case with the cam member sandwiched therebetween, and exert biasing forces on each other in the direction of the cam member. The working surface of the buffer member is in contact with the cam member. The arm is arranged to be rotatable about the corner shaft with its tip side exposed, and can switch between an open position and a closed position. When the arm is locked to the locking member and rotates from the open position to the closed position, at the initial stage of rotation, the biasing member extends to bias the cam member to rotate, and the buffer member contracts to buffer the rotation of the cam member. However, when the arm reaches a predetermined angle and the working surface of the buffer member overrides the protrusion of the cam member, the rotation speed of the arm is accelerated. This is the feature of the invention.

[0012] In this way, when the arm rotates from the open position to the closed position, by accelerating the rotation speed at a predetermined angle, for example, in the case of a hinged door with the weight of the door body or a hinged door equipped with a latch bolt, it is possible to close the door body with sufficient force without being obstructed by the resistance, prevent the door from being half-open, and at the same time, it is easier to recognize that the closing is completed due to the generation of impact and sound when closing with momentum.

[0013] In the present invention, when a plurality of protrusions are formed on the cam member and the working surface of the buffer member changes the rotation speed when it overrides each protrusion when the arm rotates from the open position to the closed position, for example, by setting the rotation speed from low speed → medium speed → high speed or low speed → high speed → medium speed, it is possible to more reliably close the door body and make the operation smooth and luxurious.

[0014] In the present invention, the locked member has a guide passage composed of an insertion groove and a locking groove, and a retraction chamber formed by expanding outward from the end of the bent portion of the guide passage. A cushion member is mounted in the retraction chamber. When the tip of the arm contacts the cushion member and is buffered during the process of the arm rotating to the closed position, even if the door body is urged strongly in the closing direction, in addition to the buffering action of the buffer member, the cushion member mounted in the retraction chamber buffers it, so that the door body does not close at its momentum, but moves slowly in the closing direction at a controlled speed. When the arm reaches a predetermined angle, the rotation speed can be accelerated to ensure reliable closing.

[0015] In the present invention, when the cushion member is made of an elastic body with a cavity formed therein, it is particularly desirable because it has a relatively simple structure and can be easily deformed and restored.

[0016] In the present invention, a return passage communicating with the locking groove in the guide passage is formed on the outside of the locked member. A retractable latch that only permits movement from the outside into the locking groove is arranged in the return passage. When the arm contacts the locked member while remaining in the closed position, after moving the tip of the arm into the locking groove while immersing the latch, the latch returns to its original position to hold the tip of the arm in the locking groove so that it does not fall off. Even if only the arm moves to the closed position due to some factor, the locked member can automatically return to the locking groove through the return passage, enabling continuous use without problems.

[0017] In the present invention, when the biasing member of the main body is a coil spring and is provided with an adjusting member capable of expanding and contracting the length of the spring chamber in which the coil spring is housed by operation, for example, the length of the spring chamber can be extended to weaken the biasing force and slow down the rotation speed of the arm during acceleration, or conversely, the length of the spring chamber can be expanded and contracted to strengthen the biasing force and increase the rotation speed of the arm during acceleration.

[0018] In the present invention, when the case has a bilaterally symmetric outer shape and the main body can be installed facing forward or backward according to the left or right convenience of the door body, by making it possible to select the mounting orientation from the front and back, in addition to installing it according to the opening convenience of the door body, it becomes possible to adjust the position of the locked member and the like, and the degree of freedom in installation can be increased.

[0019] In the present invention, when an arm angle adjustment screw whose tip contacts the cam member is attached to the case and the rotation angle of the arm can be limited according to the protruding amount of the arm angle adjustment screw, by reducing the rotation angle of the arm, for example, the momentum at the time of closing the door body can be adjusted, or rattling can be absorbed.

Effects of the Invention

[0020] According to the present invention, when the arm reaches a predetermined angle, the action of the cam member accelerates the rotation speed of the arm, so that the door body can be surely closed.

Brief Description of the Drawings

[0021]

Figure 1

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Embodiments for Carrying out the Invention

[0022] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[0023] Figs. 1 to 10 are diagrams showing preferred embodiments of the door body closing device of the present invention. This closing device 1 is a swing door type door body closing device used for buildings, refrigerators, etc., which consists of a main body 100 fixed to the door frame side and a locked member 200 fixed to the door body side.

[0024] The main body 100 consists of a case 110, an arm 120, a cam member 130, a corner shaft 140, a biasing member 150, a buffer member 160, a crank member 170, and an adjustment member 180.

[0025] The case 110 consists of a housing 111 and a lid 112. The housing 111 has a rectangular parallelepiped shape with an open top, and the structure is such that the top surface is closed by attaching the lid 112. Further, mounting portions 113 with mounting holes for mounting to the door body are protruding from both ends in the longitudinal direction of the housing 111.

[0026] Also, a spring chamber 114 and a damper chamber 115 are formed in the housing 111 of the case 110 so as to sandwich the fixing portion of the corner shaft 140 located in the center.

[0027] A total of five caulking shafts 116 are erected at both ends in the longitudinal direction and the central portion in the longitudinal direction of the housing 111, and the caulking shafts 116 are fixedly and non-removably fixed by covering the through holes 117 formed at positions corresponding to the caulking shafts 116 in the lid 112.

[0028] Note that the caulking shaft 116 may be replaced with a caulking-free guide pin, screw member, etc., and detachably fixed.

[0029] The arm 120 has a base end portion 121 integrated with the angular shaft 140 and a tip end portion 122 on which a roller 123 is rotatably mounted. The tip end portion 122 is pivotally supported by the angular shaft 140 held in the case 110 so as to swing within a range of 90°, and the open position and the closed position can be switched. Also, the insertion direction of the arm 120 into the case 110 can be selected front or back.

[0030] The cam member 130 has an angular hole 131 formed at the center, a cam surface 132 formed in the centrifugal direction, and a rod connection portion 133 formed away from the cam surface 132. The cam surface 132 exhibits an asymmetric mountain shape having one protrusion. By inserting the angular shaft 140 into the angular hole 131, the cam member 130 and the angular shaft 140 are engaged so as to rotate integrally. Note that with the angular shaft 140 inserted into the angular hole 131, the cam member 130 and the angular shaft 140 are engaged in a non-detachable manner by a set screw 141 screwed from the bottom surface side of the case 110.

[0031] The rod connection portion 133 is composed of a clamping piece 134 having an upper hole 135 and a clamping piece 136 having a lower hole 137, which are formed in parallel with a gap therebetween.

[0032] The biasing member 150 is composed of a compression coil spring 151 housed in a spring chamber 114 provided in the housing 111 and a slide body 152, and is connected to the cam member 130 by the crank member 170. The cam member 130 is biased in the closing direction and rotated in the closing direction via the crank member 170. The compression coil spring 151 is installed in a compressed state when the arm 120 is in the open position.

[0033] The slide body 152 has a substantially rectangular parallelepiped shape and is slidably disposed within the spring chamber 114. An insertion hole 153 for inserting the compression coil spring 151 is formed at one end side in the longitudinal direction, and an insertion hole 154 for inserting the crank member 170 is formed at the other end side in the longitudinal direction.

[0034] The buffer member 160 is two oil dampers 161 each having a cylinder and a rod, and is installed in an extended state. When the arm 120 is locked to the locked member 200 and rotates from the open position to the closed position, the buffer member 160 is pushed by the cam surface 132 of the cam member 130 and contracts, thereby buffering the biasing force that causes the arm 120 to rotate in the closing direction. The buffer member 160 is used in combination with a follower 162 having an inclined working surface 163 at its tip. Although the oil damper is small, it is particularly suitable as a buffer member in terms of the magnitude of the buffer effect and the speed of the return operation. However, as long as it expands and contracts to exhibit a buffer effect, other components than the oil damper may be adopted. For example, a gas spring or a coil spring may be used as the buffer member.

[0035] The follower 162 is disposed between the buffer member 160 and the arm 120, and is disposed within the damper chamber 115 such that the working surface 163 faces the cam surface 132 (outer side) of the cam member 130. The follower 162 is formed with a stepped portion 164, and by contacting the stepped portion 164 with the housing 111, it can be set at a predetermined position and is easy to assemble. The buffer member 160 and the follower 162 may be integrally formed. Further, the tip 165 of the follower 162 is flat.

[0036] The crank member 170 includes a plate-shaped rod 171 having pin holes 172 formed at both ends, and a hinge pin 173 inserted into the pin holes 172. The connection between the biasing member 150 and the cam member 130 is achieved by inserting one end of the rod 171 into the rod connection portion 133 and inserting the hinge pin 173 from above in a state where the upper hole 135, the lower hole 137, and the pin hole 172 communicate with each other, thereby fixing it so as to be rotatable about an axis. Then, with the hinge pin 173 inserted into the pin hole 172 at the other end of the rod from above, it is inserted into the insertion hole 154 of the slide body 152 to be fixed so as to be rotatable about an axis.

[0037] At this time, the hinge pin 173 has a shape consisting of a head and a shaft portion, and since the diameter of the head is larger than the diameter of the pin hole, the hinge pin 173 inserted from above is configured to stay. Note that the upper hole 135 of the clamping piece 134 of the cam member 130 is formed to have a larger diameter than the lower hole 137 of the clamping piece 136 and slightly larger diameter than the head.

[0038] The adjustment member 180 includes a spring guide 181 having guide protrusions 182 formed vertically and arranged to be movable in the axial direction of the housing, an adjustment screw 183 for moving the spring guide 181, a driven motor gear 184 for rotating the adjustment screw 183, and a driving motor gear 185 for rotating the driven motor gear 184.

[0039] The spring guide 181 is configured to be movable along the axial direction of the case 110 by preventing rotation by engaging with a guide groove 188 formed in the lid body 112 and a guide groove 189 formed in the bottom surface of the housing 111 when the adjustment screw 183 rotates. Also, since the guide protrusion 182 is exposed on the surface, the position of the spring guide 181 can be confirmed from the outside.

[0040] Therefore, by moving the spring guide 181 back and forth, it becomes possible to expand and contract the length of the spring chamber 114 in which the biasing member 150 is housed. When the length of the spring chamber is extended to weaken the biasing force and slow down the rotation speed of the arm during acceleration, or conversely, when the length of the spring chamber is expanded and contracted to strengthen the biasing force and increase the rotation speed of the arm during acceleration, the position of the spring guide 181 can be easily adjusted by visually checking from the outside.

[0041] The driving motor gears 185 are symmetrically arranged vertically so as to mesh with the driven motor gear 184, and the driving motor gear can be rotated by a tool through an operation hole formed on the lid body 112 side or an operation hole formed on the bottom surface side of the housing 111.

[0042] An arm angle adjustment screw 190, which is a set screw, is attached to a screw hole formed on the side surface of the housing 111, and the tip of the arm angle adjustment screw 190 contacts the cam member 130. Therefore, the rotation angle of the arm 120 can be limited according to the protruding amount of the arm angle adjustment screw 190. By protruding the arm angle adjustment screw 190 to reduce the rotation angle of the arm 120, for example, the momentum when the door body is closed can be adjusted, or rattling can be absorbed.

[0043] Note that a notch 162a is formed in the follower 162, and the structure is such that the arm angle adjustment screw 190 in the protruding state does not interfere (see FIG. 9).

[0044] The main body 100 is attached by being embedded in a groove formed on the top surface of the door body and screwing the mounting portion 113 with a fixing screw. Note that the case 110 is formed symmetrically on the front and back, and since the insertion direction of the arm 120 can also be changed between the front and back, the main body 100 can also be attached in a posture with the top and bottom reversed. That is, it becomes possible to change between left-handed and right-handed.

[0045] When the arm 120 locks onto the locked object 200 and rotates from the open position to the closed position, the biasing member 150 extends, and the buffer member 160 is pushed against the cam surface 132 of the cam member 130 and contracts. However, when the arm 120 reaches a predetermined angle θ and the working surface 163 of the buffer member 160 (the follower 162) gets over the protrusion of the cam surface 132, the contraction of the buffer member 160 stops. On the other hand, the biasing member 150 continues to extend to accelerate the rotation speed of the arm 120 (see Fig. 8). In this embodiment, the predetermined angle θ is 25°.

[0046] The locked object 200 has a guide passage 210, a retraction chamber 220, and a return passage 230 (see Fig. 10). The guide passage 210 is composed of an insertion groove 211 and a locking groove 212, and the retraction chamber 220 is formed by expanding outward from the end of the bent portion of the guide passage 210.

[0047] A cushion member 221 is mounted in the retraction chamber 220, and the tip of the arm 120 (the roller 123) contacts the cushion member 221 and is buffered during the process of the arm 120 rotating to the closed position.

[0048] By providing the cushion member 221 in this way, even if the door body is biased strongly in the closing direction, in addition to the buffering action of the buffer member 160, the cushion member 221 mounted in the retraction chamber 220 is deformed to buffer, so that the door body does not close at its full momentum. Instead, it moves slowly in the closing direction at a controlled speed, and when the arm 120 reaches the predetermined angle θ, the rotation speed is accelerated to ensure reliable closing.

[0049] The cushion member 221 is made of an elastic body with a hollow portion 222 formed inside and a hook-shaped locking protrusion 223 formed outside. It is mounted by inserting the locking protrusion 223 into the insertion hole formed in the side wall of the retraction chamber 220 while pushing it into the retraction chamber 220. As the material, synthetic rubber such as silicone rubber is preferably suitable.

[0050] By configuring the cushion member 221 with an elastic body having the cavity portion 222 in this way, compared with the conventional inventions that use a spring and a valve body / gate bar in combination as in Patent Documents 3 and 4, for example, it is possible to deform and restore easily with a relatively simple structure, which is particularly desirable. Further, the cavity portion 222 is composed of a wide portion 222a and a narrow portion 222b, and the amount of deformation and the restoring force are adjusted according to this shape.

[0051] Specifically, depending on the magnitude of the force applied when the roller 123 contacts the cushion member 221 during the closing process of the door body, it is structured to deform and buffer in the following steps, for example. (1) When the cushion member 221 does not deform (2) When only the wide portion 222a deforms and buffers (3) When the wide portion 222a and the narrow portion 222b deform and buffer (4) When the cavity portion 222 is completely deformed and further buffers by the elastic force of the cushion member 221

[0052] In the state where the cavity portion 222 is completely deformed and buffers by the elastic force of the cushion member 221 as in (4) above, it buffers in the shape of the inclined portion 224 provided at a position corresponding to the back side of the cavity portion 222 with respect to the intrusion direction of the roller 123, and functions to escape from the retreat chamber 220 and push it back into the locking groove 212.

[0053] The front side of the cavity portion 222 is a thin-walled portion 222c, and the back side is a thick-walled portion 222d. In this way, by dividing it into the thin-walled portion 222c and the thick-walled portion 222d, the easily deformable thin-walled portion 222c expands and contracts to absorb the impact, and when a force that cannot be absorbed by the thin-walled portion 222c is applied, it can be received by the thick-walled portion 222d on the back side.

[0054] If the hardness of the thin-walled portion 222c is made soft to facilitate its expansion and contraction, the impact cannot be suppressed, and even if the door body is gently closed, it will easily reach the thick-walled portion 222d on the back side, resulting in an extra long closing time of the door body. In addition, if the expansion and contraction distance of the thin-walled portion 222c is too large, there is a risk of reduced durability. If the closing time of the door body becomes extra long, it will cause a sense of discomfort compared to the normal opening and closing feeling of the door body, which will become a problem in the sensory evaluation.

[0055] For example, in the conventional inventions that combine a spring and a valve body / gate bar as disclosed in Patent Documents 3 and 4, the strength of the compression spring can be adjusted relatively easily, and it was possible to obtain a preferred touch without a sense of discomfort in the sensory evaluation. However, in order to achieve the same effect with a simpler structure and also realize a touch without a sense of discomfort in the sensory evaluation, the inventor repeated trial and error and completed the cushion member 221 as in this embodiment.

[0056] The return passage 230 is formed to communicate with the locking groove 212 in the guide passage 210 from the outside of the locked member 200. An extendable and retractable latch 231 that only permits movement from the outside into the locking groove 212 is disposed in the return passage 230.

[0057] When the arm 120 contacts the locked member 200 while remaining in the closed position, after moving the tip of the arm 120 into the locking groove 212 while retracting the latch 231, the latch 231 returns to its original position, thereby holding the tip of the arm 120 from falling out of the locking groove 212.

[0058] In this way, by providing an automatic return mechanism with a return passage and a latch, even if only the arm moves to the closed position due to some factor, the arm can automatically return to the locking groove through the return passage and continue to be used without problems.

[0059] Note that the locked member 200 shown in FIG. 10 has a left-handed structure, but a right-handed locked member (not shown) with a structure in which the left and right are reversed can also be used.

[0060] The process in which the cam member 130 rotates as the arm 120 rotates will be described below with reference to FIGS. 11 to 15.

[0061] FIG. 11 is a partially enlarged view showing the periphery of the cam member 130 when the arm 120 is in the initial position before starting to rotate. From here, when the arm 120 starts to rotate by the operation of closing the door body, the cam member 130 also rotates via the angular shaft 140, the angle changes, the positional relationship of the crank member 170 changes, and the biasing force of the biasing member 150 starts to act on the cam member 130.

[0062] In the state of FIG. 11, the tip of the slide body 152 is at the position of S1, and the rear end of the follower is at the position of D1.

[0063] FIG. 12 is a view showing the state before the working surface 163 of the follower 162 gets over the protrusion of the cam surface 132 after the arm 120 starts to rotate. At this time, the biasing force by which the biasing member 150 extends is offset by the buffering force by which the buffering member 160 contracts while rotating the cam member 130.

[0064] In the state of FIG. 12, the tip of the slide body 152 advances from the position of S1 to the position of S2, and the rear end of the follower retreats from the position of D1 to the position of D2.

[0065] FIG. 13 is a view showing the state in which the arm 120 further rotates and the working surface 163 of the follower 162 gets over the protrusion of the cam surface 132. After this, the cam member 130 rotates so as to slide on the working surface 163 of the follower 162. Since the buffering member 160 is not contracted, the biasing force by which the biasing member 150 extends rotates the cam member 130 without being offset by the buffering force by which the buffering member 160 contracts.

[0066] Note that by adjusting the relationship between the working surface 163 of the follower 162 and the protrusion of the cam surface 132, that is, by adjusting the angle when the working surface 163 overrides the protrusion of the cam surface 132, etc., the predetermined angle θ can be changed, and the degree of acceleration of the rotation speed can also be changed.

[0067] As adjustment methods, for example, changing the angle of the working surface 163, changing the position of the protrusion of the cam surface 132, changing the shape of the protrusion of the cam surface 132, etc. can be considered, but other adjustment methods may also be adopted.

[0068] In the state of FIG. 13, the tip of the slide body 152 advances from the position of S2 to the position of S3, and the rear end of the follower 162 retreats from the position of D2 to the position of D3.

[0069] FIG. 14 is a view of the state where the rotation of the arm 120 is completed. In the state of FIG. 14, the tip of the slide body 152 advances from the position of S3 to the position of S4, but the rear end of the follower 162 does not change from the position of D3.

[0070] FIG. 15 is an explanatory view showing the relationship between the biasing force (rightward white arrow shown) of the biasing member 150, the buffering force (leftward white arrow shown) of the buffering member 160, and the rotational force (clockwise black arrow shown) of the cam member 130, with the views of FIGS. 11 to 14 reduced and arranged side by side.

[0071] When the working surface 163 of the follower overrides the protrusion of the cam surface 132, the contraction of the buffering member 160 stops, and only the biasing member 150 extends and biases, so that the rotation speed of the arm 120 can be accelerated.

[0072] By accelerating the rotation speed of the arm 120 at the end of the closing process in this way, for example, in the case of a hinged door with the weight of the door body or a hinged door equipped with a latch bolt, it is possible to close the door body with sufficient force without being obstructed by these resistances, prevent the door from being half-opened, and at the same time, it is easy to recognize that the closing is completed due to the generation of impact and sound when closing with momentum.

[0073] In addition, for example, by changing the shape of the cam member, when the arm 120 reaches a predetermined angle, instead of stopping the contraction of the buffer member 160, it may be extended in the reverse direction, and the biasing force of the biasing member 150 and the biasing force of the buffer member 160 may be combined to rotate the cam member 130 (not shown).

[0074] Figs. 16 to 19 are explanatory diagrams showing the closing process (the process in which the arm rotates from the open position to the closed position) of the closing device 1 of the present invention when the main body 100 of the closing device 1 is attached to the hinged left-handed door body D of a building or the like and the engaging member 200 of the closing device 1 is attached to the door frame F of the building, and sequentially show the process of transitioning from the open position shown in Fig. 16 to the closed position shown in Fig. 19.

[0075] First, as the door body D with the main body 100 fixed is closed, the roller 123 at the tip of the arm 120 is introduced into and engaged with the insertion groove 211 of the engaging member 200 (Fig. 16).

[0076] Then, when the door body D is pushed in the closing direction, the angle of the cam member 130 changes due to the rotation of the arm 120, and the biasing member 150 starts to exert a biasing force to rotate the arm 120 (the cam member 130) in the closing direction.

[0077] At this time, the buffer member 160 contracts and buffers against the force that rotates the arm 120 (the cam member 130) in the closing direction by the biasing force of the biasing member 150, thus preventing the door body D from closing suddenly.

[0078] Also, at this time, even if a strong force is applied to push the door body D in the closing direction, in addition to the function of the buffer member 160 installed on the main body 100, the cushion member 221 installed on the locked member 200 deforms the cushion member 221 while guiding the arm 120 into the retraction chamber 220 for buffering, thus preventing the door body D from closing suddenly (FIG. 17).

[0079] Furthermore, when the rotation of the arm 120 toward the closed position further progresses, the working surface 163 of the follower 162 rides over the protrusion of the cam surface 132 of the cam member 130 at a predetermined angle θ, and only the biasing force of the biasing member 150 on the arm 120 (the cam member 130) acts as the force to rotate the arm 120 (the cam member 130) in the closing direction, so the rotation speed of the arm 120 accelerates (FIG. 18).

[0080] Therefore, it is possible to exert a biasing force only to return the arm 120 (the roller 123) guided into the retraction chamber 220 and with its momentum attenuated to the locking groove 212, and reliably close the door body D.

[0081] After that, when the roller 123 at the tip of the arm 120 reaches the locking groove 212 of the guide passage 210 and the rotation of the arm 120 toward the closed position is completed, the cam surface 132 (outer side) of the cam portion 130 contacts the wall surface of the housing 111, restricting further rotation in the closing direction (FIG. 19).

[0082] In addition, when the force to push the door body D in the closing direction is weak, the roller 123 at the tip of the arm 120 advances along the surface of the cushion member 221 through the guide passage 210 as it is and reaches the locking groove 212 without causing deformation of the cushion member 221 as shown in FIG. 17.

[0083] Further, FIG. 20 is a reference explanatory diagram showing the closing process (the process in which the arm rotates from the open position to the closed position) of the closing device of the door body of the present invention attached to the right-handed door body of a building or the like and its door frame. As shown in this figure, by changing the vertical direction of the main body and the attachment direction of the arm, and using a locked member with a left-right reversed structure, it is also possible to easily change between left-handed and right-handed, enabling the sharing of parts and minimizing the number of parts as much as possible.

[0084] Specifically, FIG. 20(a) shows a scene where the roller at the tip of the arm is introduced into and engaged with the insertion groove of the locked member as in FIG. 16, and FIG. 20(b) shows a scene as seen from the opposite side. Next, FIG. 20(c) shows a scene where, as in FIG. 12, the protrusion on the cam surface is overcome by the working surface of the follower at a predetermined angle θ, and the biasing force by the biasing member acts as a force to rotate the arm in the closing direction. Finally, FIG. 20(d) shows a scene where, as in FIG. 19, the roller at the tip of the arm reaches the locking groove in the guide passage and completes the rotation to the closed position.

[0085] In addition, in each of the above embodiments, the device is shown for use with the opening door body of a building, but it can also be used, for example, as a closing device for the door body of a refrigerator.

[0086] As described above, according to the present invention, when used as a closing device for the opening door body of a building, it is possible to reliably buffer the momentum during door closing to prevent damage to the door body or the building, or injury to the user, and after once buffering, by accelerating the rotation speed of the arm by the cam member, it is possible to surely close the door body.

Explanation of Reference Numerals

[0087] 1 Locking device, 100 Main body, 110 Case, 111 Housing, 112 Lid, 113 Mounting part, 114 Spring chamber, 115 Damper chamber, 116 Caulking shaft, 117 Through hole, 118 Guide groove, 119 Guide groove, 120 Arm, 121 Base end part, 122 Tip part, 123 Roller, 130 Cam member, 131 Square hole, 132 Cam surface, 133 Rod connection part, 134 Clamping piece, 135 Upper hole, 136 Clamping piece, 137 Lower hole, 140 Angular shaft, 141 Set screw, 150 Biasing member, 151 Compression coil spring, 152 Slide body, 153, 154 Insertion hole, 160 Buffer member, 161 Oil damper, 162 Follower, 162a Notch, 163 Working surface, 164 Step part, 165 Tip, 170 Crank member, 171 Rod, 172 Pin hole, 173 Hinge pin, 180 Adjusting member, 181 Spring guide, 182 Guide projection, 183 Adjusting screw, 184 Driven motor gear, 185 Driving motor gear, 190 Arm angle adjusting screw, 200 Locked object, 210 Guide passage, 211 Insertion groove, 212 Locking groove, 220 Retreating chamber, 221 Cushion member, 222 Hollow part, 222a Wide part, 222b Narrow part, 222c Thin part, 222d Thick part, 223 Locking projection, 224 Inclined part, 230 Return passage, 231 Latch

Claims

1. A closing device for a hinged door body, comprising a main body and a locked object, wherein: The main body consists of a case, an arm, a cam member, a corner shaft, a biasing member, and a buffer member. The corner shaft is rotatably fixed to the case, and the cam member and the corner shaft are engaged to rotate integrally. The biasing member and the buffer member are arranged in the case with the cam member therebetween to exert biasing forces on each other in the direction of the cam member, and the working surface of the buffer member is in contact with the cam member. The arm is rotatably arranged about the corner shaft with its tip exposed, and can switch between an open position and a closed position. When the arm rotates from the open position to the closed position by engaging with the locked object, at the initial stage of rotation, the biasing member extends to bias the rotation of the cam member, and the buffer member contracts to buffer the rotation of the cam member. However, when the arm reaches a predetermined angle and the working surface of the buffer member passes over the protrusion of the cam member, the rotation speed of the arm is accelerated. A closing device for a door body, characterized by the above.

2. A plurality of protrusions are formed on the cam member. When the arm rotates from the open position to the closed position, the rotation speed is changed when the working surface of the buffer member passes over each protrusion. The closing device for a door body according to claim 1, characterized by the above.

3. The locked object has a guide passage composed of an insertion groove and a locking groove, and a retraction chamber formed by expanding outward from the end of the bent portion of the guide passage. A cushion member is mounted in the retraction chamber. During the process of the arm rotating to the closed position, the tip of the arm contacts the cushion member and is buffered. The closing device for a door body according to claim 1, characterized by the above.

4. The cushion member is made of an elastic body with a cavity formed therein. The closing device for a door body according to claim 3, characterized by the above.

5. A return passage communicating with the locking groove in the guide passage is formed in the locked object from the outside thereof. A retractable latch that only permits movement from the outside into the locking groove is arranged in the return passage. When the arm contacts the locked object while remaining in the closed position, the tip of the arm is moved into the locking groove while the latch is immersed, and then the latch returns to its original position to hold the tip of the arm in the locking groove so as not to fall off. The closing device for a door body according to claim 3, characterized in that...

6. The biasing member of the main body is a coil spring, and the spring chamber in which the coil spring is housed by an operation is provided with an adjusting member capable of expanding and contracting the length thereof. The closing device for a door body according to claim 1, characterized in that...

7. The case has a bilaterally symmetric outer shape, and the main body can be installed facing forward or backward according to the left or right convenience of the door body. The closing device for a door body according to claim 1, characterized in that...

8. An arm angle adjustment screw whose tip contacts the cam member is attached to the case, and the rotation angle of the arm can be limited according to the protruding amount of the arm angle adjustment screw. The closing device for a door body according to claim 1, characterized in that...

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