Door stopper body and door stopper

Abstract

To provide a door stopper body that securely holds the door in the open position and can be installed even on doors with a narrow gap between the bottom end and the floor. [Solution] The door stopper body 3 is a door stopper body provided at the lower end of the door body 1, and comprises a case 30, a cylinder 33 housed within the case so as to be able to move back and forth and with one end protruding from the lower surface of the case, a first elastic member 35 provided on the outer circumference of the cylinder which biases the cylinder upward against the weight of the cylinder, and a magnetic member 34 provided on the cylinder which, by magnetic force, pulls the cylinder toward a door stopper receiving portion provided on the floor surface, and the cylinder is housed within the case with clearances CL1, CL2, CL3 between the other end and the inner surface of the case while the biasing force of the first elastic member is acting on it.

Description

Technical Field

[0001] The present invention relates to a door stopper body and a door stopper.

Background Art

[0002] Conventionally, there has been proposed a door stopper (door stopper) composed of a door-side member attached to an opening door and a floor-side member fixed to the floor surface, in which the tip of a lock pin of the door-side member fits into a lock hole of the floor-side member by its own weight or elastic force to stop and hold the opening door in the open position (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the lock pin of Patent Document 1 is biased by a first biasing spring in the standby state and protrudes from the guide case at a certain height, and the tip of the lock pin abuts against the floor-side member while maintaining the standby height. Further, when reaching the inclined portion with an upward gradient of the floor-side member, the lock pin is pushed up against the first biasing spring, and when reaching the lock hole, the lock pin is pushed down again to the standby height by the downward elastic force of the first biasing spring.

[0005] Normally, an undercut for ventilation is provided between the lower end of the door body constituting the opening door and the floor surface. However, in many cases, construction is carried out without providing a large undercut in order to enhance the sound insulation effect and heat insulation effect. Therefore, there has been a problem that it is difficult to attach the lock pin of Patent Document 1 to an opening door with a narrow gap between the lower end of such a door body and the floor surface.

[0006] ?The purpose of this disclosure is to provide a door stopper body that can securely hold the door in the open position and can be installed even on doors with a narrow gap between the bottom end and the floor surface. [Means for solving the problem]

[0007] This disclosure relates to a door stopper body provided at the lower end of a door, comprising: a case; a cylinder housed within the case so as to be movable back and forth, with one end protruding from the lower surface of the case; a first elastic member provided on the outer circumference of the cylinder and biasing the cylinder upward against the weight of the cylinder; and a magnetic member provided on the cylinder and pulling the cylinder toward a door stopper receiving portion provided on the floor surface by magnetic force, wherein the cylinder is housed within the case with a clearance between its other end and the inner surface of the case when the biasing force of the first elastic member is acting upon it. [Brief explanation of the drawing]

[0008] [Figure 1] This is a diagram showing a door frame equipped with a door stopper as described in this disclosure. [Figure 2] This is a perspective view of the door stopper body part related to this disclosure, seen from above. [Figure 3] This is a perspective view of the door stopper body part related to this disclosure, seen from below. [Figure 4] Figure 2 is an exploded perspective view. [Figure 5] Figure 3 is an exploded perspective view. [Figure 6] This is a front view of the central vertical cross-section of the door stopper related to this disclosure. [Figure 7] This is a perspective view of the door stopper receiving portion related to this disclosure, seen from the front and above. [Figure 8] This is a perspective view of the door stopper receiving portion related to this disclosure, seen from the upper rear. [Figure 9] This is a perspective view from below of the door stopper receiving portion related to this disclosure. [Figure 10] This is a front view of the central vertical cross-section of the door stopper receiving portion related to this disclosure. [Figure 11]Figure 7 is an exploded perspective view. [Figure 12] Figure 9 is an exploded perspective view. [Figure 13A] This is a cross-sectional view showing the standby state of the door stopper related to this disclosure. [Figure 13B] This is a cross-sectional view showing how the door stopper body engages with the engagement groove of the door stopper receiver. [Figure 13C] This is a cross-sectional view showing how the door stopper body is locked to the wall of the door stopper receiving section. [Figure 13D] This is a cross-sectional view showing how the door stopper body is temporarily held in place by the stepped portion of the door stopper receiving section. [Figure 14A] This is a cross-sectional view showing a modified example of the door stopper receiving portion related to this disclosure. [Figure 14B] This is a cross-sectional view showing how the door stopper body engages with a modified version of the door stopper receiver. [Modes for carrying out the invention]

[0009] The embodiments of this disclosure will be described in detail below with reference to the drawings. In the drawings of this disclosure, four predetermined directions that are orthogonal to each other are represented as "Fr direction," "Rr direction," "R direction," and "L direction." The "Fr direction" is the direction of rotation when the door body 1 installed in the opening of a building rotates to open the opening, the "Rr direction" is the direction of rotation when the door body 1 closes the opening, the "R direction" is the right direction when the "Fr direction" is facing forward, and the "L direction" is the left direction when the "Fr direction" is facing forward.

[0010] As shown in Fig. 1, the door stopper 10 has a door stopper main body portion 3 and a door stopper receiving portion 4. The door stopper main body portion 3 is attached to the lower end of the door body 1 whose one end side is pivotally supported by the frame body 2 provided at the opening 20 of the building. Further, the door stopper receiving portion 4 is provided on the floor surface F. With this configuration, when the door body 1 rotates in the direction of the arrow and the opening is released, the door stopper main body portion 3 is engaged with the door stopper receiving portion 4, and the door body 1 can be held in the open position. In Fig. 1, the door body 1 is represented by a two-dot chain line.

[0011] The door body 1 is a single-leaf door provided indoors, but the present disclosure is not limited to this. For example, the door stopper main body portion 3 may be attached to the entrance door, and the door stopper receiving portion 4 may be installed on the floor surface of the entrance porch. Further, not only the single-leaf door, but also the door stopper 10 may be provided on, for example, a double-leaf door.

[0012] As shown in Figs. 4 and 5, the door stopper main body portion 3 has a case 30, a cylinder 33, a magnetic member 34, a first elastic member 35, second elastic members 36, 36, and cover members 37, 37. The case 30 includes an outer case 31 and an inner case 32 accommodated in the outer case 31 and in which the cylinder 33 is accommodated so as to be able to advance and retreat.

[0013] The door stopper main body portion 3 is formed of resin except for the magnetic member 34, but is not limited to this. It may be formed of any material that does not have magnetism, and for example, a metal that does not have magnetism such as aluminum may be used.

[0014] The outer case 31 has a base portion 311, a cylindrical portion 312, and a lid portion 313. As shown in Figs. 2 and ③, the outer case 31 is a member that constitutes the appearance of the door stopper main body portion 3, and the members other than the cover member 37 are accommodated in the outer case 31 and assembled.

[0015] As shown in Figures 4 and 5, the base portion 311 forms the bottom surface of the cylindrical portion 312 and has a pair of screw holes 311a, 311a and an opening 311b. The base portion 311 is provided extending in the L and R directions, and each end is provided with a screw hole 311a tapped from below. As shown in Figure 3, the opening 311b is a through hole opened approximately in the center in the left-right direction, and the lower end of the cylinder 33 protrudes from the opening 311b. Screws (not shown) are inserted through the screw holes 311a, 311a, and the door stopper body portion 3 is attached to the lower end of the door body 1.

[0016] As shown in Figures 4 and 5, the cylindrical portion 312 is configured in a substantially rectangular cylindrical shape. The cylindrical portion 312 has elongated holes 312a, 312a and ribs 312b, 312b. The elongated holes 312a, 312a, which extend in the left-right direction, are provided on the outer circumferential surfaces of the cylindrical portion 312 in the Fr and Rr directions. The ribs 312b, 312b are provided on the inner circumferential surfaces of the cylindrical portion 312 in the L and R directions, and as shown in Figure 6, they are spring-hanging ribs that hold and fix a pair of second elastic members 36, 36.

[0017] The lid portion 313 has a plurality of claw portions 313a extending downward, which engage with the cylindrical portion 312. The lid portion 313 is constructed independently and engages with the cylindrical portion 312 after the components other than the cover member 37 are housed in the outer case 31. This configuration allows for easy assembly of the door stopper body portion 3.

[0018] The inner case 32 has a bottom portion 321 and a side portion 322, and is formed with an upward opening. The bottom portion 321 has an opening 321a, and as shown in Figure 6, the lower end of the cylinder 33 is provided protruding from the opening 321a. The side portion 322 has projections 322a, 322a and ribs 322b, 322b.

[0019] The projections 322a, 322a are protrusions that extend in the left-right direction, projecting from the outer peripheral surfaces of the side portion 322 in the Fr and Rr directions. The inner case 32 is attached to the outer case 31 by the engagement of the projections 322a, 322a of the inner case 32 with the elongated holes 312a, 312a of the outer case 31.

[0020] The ribs 322b, 322b are a pair of ribs that protrude from the outer peripheral surfaces of the side portion 322 in the L and R directions, and are spring-attached ribs that secure the second elastic members 36, 36, as shown in Figure 6.

[0021] As shown in Figures 4 and 5, the cylinder 33 is an open-topped member having a bottom portion 331, a cylindrical portion 332, and a flange portion 333 that protrudes outward. As shown in Figure 5, the bottom portion 331 has an end 331a in the Rr direction and an end 331b in the fr direction. As shown in Figure 6, the lower end of the cylinder 33 is tapered to be narrower than the upper end, and one end has a smaller diameter than the other end.

[0022] This configuration provides a sound-dampening effect, suppressing contact noise when the bottom surface 331 of the cylinder 33 comes into contact with the door stopper receiving portion 4. Furthermore, the cylinder of this disclosure is not limited to this shape. For example, it may be configured as a cylindrical shape with the same shape at both ends.

[0023] As shown in Figure 6, the magnetic member 34 is housed inside the cylinder 33 and can pull the cylinder 33 toward the door stopper receiving portion 4 provided on the floor surface by magnetic force. As shown in Figures 4 to 6, the first elastic member 35 is a coil spring and is attached to the flange portion 333 and provided on the outer circumference of the cylinder 33. With this configuration, the first elastic member 35 can bias the cylinder 33 upward against the weight of the cylinder 33.

[0024] As shown in Figures 4 to 6, the pair of second elastic members 36, 36 are coil springs and are provided between the outer surface of the inner case 32 and the inner surface of the outer case 31. By arranging them opposite each other with the inner case 32 sandwiched in between, the inner case 32 can be biased in the horizontal direction.

[0025] With this configuration, even if the cylinder 33 shifts in either the left or right direction when the door stopper body 3 engages with the door stopper receiver 4, the biasing force of the second elastic members 36, 36 automatically corrects the position of the cylinder 33 to approximately the center in the left or right direction. As a result, the door stopper body 3 can engage with the door stopper receiver 4 in the correct position, and the door 1 can be held in the open position with smooth operation.

[0026] The cover members 37, 37 are concealing members that cover the elongated holes 312a, 312a of the outer case 31. As shown in Figure 1, the parts of the outer case 31 other than the base portion 311 are embedded and installed inside the door body 1. Therefore, by protecting the outer case 31 with the cover members 37, 37, it is possible to prevent dirt and dust from entering the inside of the door stopper body 3.

[0027] As shown in Figures 11 and 12, the door stopper receiving portion 4 includes a main body portion 40, a metal plate 41, an adhesive member 42, a pair of caps 43, 43, and a cushioning member 44. The main body portion 40 has an engagement groove 401, a pair of screw holes 402, 402, and a plurality of through holes 403.

[0028] The door stopper receiving portion 4 is molded from resin, except for the iron plate 41 and the adhesive member 42, but is not limited to this. It can be molded from any non-magnetic material, for example, a non-magnetic metal such as aluminum may be used.

[0029] As shown in Figure 1, the disc-shaped main body portion 40 provided on the floor surface F is provided with an engaging groove 401 into which the cylinder 33, which is the engaging portion of the door stopper main body portion 3 provided at the lower end of the door body 1, can engage. This allows the door stopper main body portion 3 to engage with the door stopper receiving portion 4, thereby holding the door body 1 in the open position.

[0030] As shown in Figures 7 and 8, the engaging groove 401 has an entrance portion 401a, a stepped portion 401b, a free-running portion 401c, and a wall portion 401d. The entrance portion 401a is formed so that the cylinder 33 of the door stopper body portion 3 can enter. As shown in Figure 10, the stepped portion 401b is provided continuously from the entrance portion 401a, and the free-running portion 401c is connected to a position one step lower via the stepped portion 401b. On the opposite side of the entrance portion 401a, the wall portion 401d is provided rising from the end of the free-running portion 401c.

[0031] The upper end surface of the wall portion 401d is positioned higher than the upper end surface of the inlet portion 401a, and the cylinder 33 that enters from the inlet portion 401a comes into contact with the wall portion 401d. As shown in Figures 7 and 8, the engaging groove 401 is configured such that the groove width narrows as it moves from the inlet portion 401a toward the wall portion 401d.

[0032] This configuration allows the cylinder 33 to easily enter the engagement groove 401 from the entrance portion 401a, which has a wide groove width, even if there is an error in the mounting position of the door body 1 during the installation of a single-leaf door. As the cylinder 33 is guided by the engagement groove 401, which narrows in width towards the wall portion 401d, it can be reliably brought into contact with the wall portion 401d, thereby eliminating mounting errors of the door body 1.

[0033] Furthermore, even if the door body 1 shifts or becomes distorted due to aging, the distortion of the door body 1 can be corrected, allowing the door stopper body 3 to smoothly engage with the door stopper receiving part 4. This allows the door stopper 10 to be used for a long period of time. In addition, even if there is an error in the mounting position, the door stopper body 3 is reliably engaged with the door stopper receiving part 4, eliminating the need to precisely adjust the mounting position of the door body 1, thus improving ease of installation.

[0034] As shown in Figures 11 and 12, the screw holes 402, 402 are through holes tapped from above the main body 40, and the main body 40 is fixed to the floor surface via screws through the screw holes 402, 402. Caps 43, 43 are inserted through the multiple through holes 403 and fixed to the main body 40.

[0035] As shown in Figure 10, the iron plate 41 is an iron plate provided inside the door stopper receiving portion 4. The iron plate 41 comprises an entrance portion 411, a stepped portion 412, and a free-running portion 413. The iron plate 41 is provided on the lower end surface of the engagement groove 401, and the entrance portion 411, stepped portion 412, and free-running portion 413 of the iron plate 41 are configured to engage with the entrance portion 401a, stepped portion 401b, and free-running portion 401c of the engagement groove 401, respectively. The free-running portion 413 has through holes 413a, 413a through which the caps 43, 43 are inserted. A cavity H1 is formed in the lower part of the entrance portion 411.

[0036] Because the cylinder 33 of the door stopper body 3 is equipped with a magnetic member 34, the cylinder 33 is attracted to the door stopper receiving portion 4 equipped with a steel plate 41 by magnetic force. However, the door stopper receiving portion 4 of this disclosure is not limited to this. For example, if the cylinder provided in the door stopper body 3 does not have a magnetic member 34 and is configured to protrude downward by an elastic member such as a coil spring, the door stopper receiving portion 4 does not need to be equipped with a steel plate 41.

[0037] As shown in Figures 11 and 12, the main body 40 and the iron plate 41 are fixed together via an adhesive member 42. The adhesive member 42 is double-sided tape, but is not limited to this. For example, the main body 40 and the iron plate 41 may be fixed together using an adhesive. Furthermore, in the door stopper receiving portion 4 where the iron plate 41 is not used, as described above, the adhesive member 42 is also unnecessary.

[0038] As shown in Figures 11 and 12, the caps 43, 43 have a plurality of claw portions 431 on their lower end surfaces. The caps 43, 43 are fixed to the main body portion 40 and the iron plate 41 via the claw portions 431. As shown in Figure 1, the caps 43, 43 can conceal the screws inserted into the main body portion 40, thereby improving the aesthetic appearance of the door stopper receiving portion 4. Since the door stopper receiving portion 4 is installed exposed on the floor surface F, it can be molded from a resin of the same color as the floor surface F, for example, to unify the design and harmonize the interior space.

[0039] As shown in Figure 10, the cushioning member 44 is provided in a cavity H1 formed at the lower part of the entrance portion 401a of the engaging groove 401. The cushioning member 44 is made of an elastic material such as resin and has a sound-dampening effect. The cushioning member 44 can be provided if a further sound-dampening effect is desired, but if it is not necessary, the cushioning member 44 does not need to be provided in the door stopper receiving portion 4.

[0040] Next, the operation of the door stopper 10 will be described. As shown in Figure 13A, in the standby state, the cylinder 33 of the door stopper body 3 is housed in the case 30 with a clearance CL1 between its upper end and the inner surface of the case 30, while the biasing force of the first elastic member 35 is acting on it. In the standby state, the lower end of the cylinder 33 protrudes from the lower surface of the case 30. Note that in Figures 13A to 14B, the door body 1 is represented by a dashed line.

[0041] With this configuration, the clearance CL1 is eliminated by pushing the standby cylinder 33 toward the door body 1, allowing the cylinder 33 to be completely housed inside the case 30. The door stopper body 3 may be shipped installed at the lower end of the door body 1, but by completely housing the cylinder 33 inside the case 30, damage during shipping can be prevented.

[0042] As shown in Figure 13A, the door stopper receiving portion 4 is installed on the floor surface F, and the entrance portion 401a of the main body portion 40 is provided so that the door stopper main body portion 3, which moves in conjunction with the opening operation of the door body 1, can enter. The door stopper main body portion 3 moves in the direction of the arrow and enters the engagement groove 401 from the entrance portion 401a of the door stopper receiving portion 4.

[0043] As shown in Figure 7, the engaging groove 401 is configured such that the groove width narrows from the entrance portion 401a towards the wall portion 401d. Therefore, the entrance portion 401a, which has a wider groove width, can eliminate displacement of the cylinder 33 in the L / R direction, or rattling of the door body 1 due to opening and closing operations, and smoothly guide the door body 1 into the interior of the door stopper receiving portion 4.

[0044] Next, as shown in Figure 13B, the cylinder 33 of the door stopper body 3, which has reached above the door stopper receiving portion 4, is attracted to the iron plate 41 located inside the door stopper receiving portion 4 by the magnetic force of the magnetic member 34 located inside it. The clearance CL2 provided in the door stopper body 3 becomes wider in the vertical direction than the clearance CL1 described above due to the downward protrusion of the cylinder 33.

[0045] The magnetic force of the magnetic member 34 causes the bottom surface 331 of the cylinder 33 to come into contact with the entrance portion 401a of the door stopper receiving portion 4, and the door stopper body portion 3 moves further into the engagement groove 401 in the direction of the arrow. Since the distance between the lower end of the cylinder 33 in the standby state and the upper surface of the entrance portion 401a is narrowed, the distance the cylinder 33 protrudes downward when it is pulled towards the entrance portion 401a can be reduced, and there is a noise reduction effect that minimizes the collision sound when the cylinder 33 comes into contact with the entrance portion 401a.

[0046] Furthermore, by providing a buffer member 44 in the cavity H1 formed at the bottom of the inlet portion 401a, the collision noise when the cylinder 33 comes into contact with the inlet portion 401a can be further suppressed. The buffer member 44 may be attached depending on the installation location of the door stopper 10, and if it is not necessary, the buffer member 44 does not need to be provided in the door stopper receiving portion 4.

[0047] Next, as shown in Figure 13C, the cylinder 33, having passed through the stepped portion 401b of the engaging groove 401 and reached the free-running portion 401c, is attracted to the free-running portion 401c by the magnetic force of the magnetic member 34. The clearance CL3 provided in the door stopper body 3 becomes even wider in the vertical direction than the clearance CL2 described above as the cylinder 33 protrudes further downward.

[0048] As the door body 1 opens, the cylinder 33 enters the engagement groove 401 and comes into contact with the wall portion 401d. The free-running portion 401c forms a clearance CL4 between the cylinder 33, which is in contact with the wall portion 401d, and the stepped portion 401b. With this configuration, when the door body 1, which has come into contact with the wall portion 401d, bounces back in the Rr direction due to the collision, the free-running portion 401c, which has a clearance CL4, moves, thereby releasing the recoil from the collision.

[0049] Next, as shown in Figure 13D, the cylinder 33, whose recoil is suppressed, moves the free-running portion 401c in the Rr direction and is temporarily held in place by engaging with the stepped portion 401b. With this configuration, the cylinder 33 does not have to go over the stepped portion 401b, and the door stopper body 3 engages with the door stopper receiving portion 4, so that the door body 1 can be reliably held in the open position.

[0050] As described above, in the standby state, the cylinder 33 of the door stopper body 3 is housed in the case 30 with an upward clearance CL1 and protrudes from the lower end of the door body 1. On the other hand, when the cylinder 33 approaches the door stopper receiving portion 4, the cylinder 33 protrudes further downward due to magnetic force and engages with the engagement groove 401 of the door stopper receiving portion 4. At this time, the clearance CL1 widens in the vertical direction, forming clearances CL2 and CL3.

[0051] This configuration minimizes the distance the cylinder 33 protrudes from the lower end of the door body 1 when the door stopper body 3 is in standby mode. Furthermore, when the door stopper body 3 engages with the door stopper receiving portion 4, the cylinder 33 is attracted to the door stopper receiving portion 4 by magnetic force, allowing the door stopper 10 to be installed on the door body 1 even when the gap between the door body 1 and the floor surface F in the opening is narrow.

[0052] Furthermore, even when there is a wide gap between the door body 1 and the floor surface F, the magnetic force of the magnetic member 34 ensures that the cylinder 33 is securely engaged with the door stopper receiving portion 4. This eliminates the need to precisely adjust the mounting position of the door body 1, and even if there is an error in the mounting position, the door stopper body 3 is securely engaged with the door stopper receiving portion 4, making it easy to install the door stopper 10. In addition, when an undercut for ventilation is provided at the bottom of the door body 1, the undercut can be set to any height without worrying about the engagement of the door stopper 10. This disclosure is not limited to the embodiments described above and may be modified as appropriate.

[0053] For example, as shown in Figures 14A and 14B, a door stopper receiving portion 4B may be used in which the engaging groove 401B is sloped downward from the entrance portion 4011 toward the stepped portion 401b. The entrance portion 4011 is configured to slope downward toward the stepped portion 401b by having an angle D1.

[0054] As shown in Figure 14A, the door stopper body 3, which is in a standby state, moves toward the entrance portion 4011 in the direction of the arrow. Next, as shown in Figure 14B, because the entrance portion 4011 slopes downward toward the step portion 401b, the bottom portion 331 of the cylinder 33 protruding from the door stopper body 3 is also pulled toward the entrance portion 4011 perpendicularly. As a result, the cylinder 33 also moves toward the wall portion 401d in the direction of the arrow, with its upper end tilted toward the Fr direction at an angle D1.

[0055] Due to the inclination of the inlet portion 4011, the bottom portion 331 of the cylinder 33 is positioned such that the end 331a in the Fr direction is lower than the end 331b in the Rr direction. Therefore, when the cylinder 33 crosses the stepped portion 401b and contacts the free-running portion 401c, the cylinder 33 contacts the bottom portion 331 from the end 331b.

[0056] This configuration eliminates the downward protrusion of the cylinder 33 when it is pulled towards the free-running section 401c, and by ensuring that the cylinder 33 continuously contacts the free-running section 401c from the inlet section 4011, the generation of collision noise when the cylinder 33 contacts the free-running section 401c can be suppressed.

[0057] By using the door stopper receiving portion 4B, the collision noise when the door stopper body portion 3 engages with the door stopper receiving portion 4B can be further suppressed, and the noise reduction effect of the door stopper 10 can be significantly improved.

[0058] Furthermore, the free-running portion 401c of the engaging groove 401 provided in the door stopper receiving portion 4 may be configured to slope downward toward the wall portion 401d. This allows the free-running portion 401c, which slopes upward toward the wall portion 401d, to further smoothly suppress the movement of the cylinder 33 when the cylinder 33 of the door stopper body portion 3, which has come into contact with the wall portion 401d, bounces back toward the Rr direction. With this configuration, the cylinder 33, whose movement has been suppressed by the free-running portion 401c, is more smoothly temporarily held by the stepped portion 401b, thereby reliably suppressing the bounce of the door body 1.

[0059] Furthermore, although the door stopper body 3 in this embodiment is provided on the lower end surface of the door body 1, the disclosure is not limited thereto. For example, the door stopper body 3 may be installed on the opening surface of the door body 1, and the cylinder 33 may protrude so as to engage with the door stopper receiving portion 4.

[0060] [Aspect 1] A door stopper body provided at the lower end of the door frame, The case and, A cylinder housed within the case so as to be able to move back and forth, with one end protruding from the lower surface of the case, A first elastic member is provided on the outer circumference of the cylinder and biases the cylinder upward against its own weight, The cylinder is provided with a magnetic member that, by magnetic force, pulls the cylinder toward a door stopper receiving portion provided on the floor surface, The cylinder is a door stopper body that is housed in the case with a clearance between its other end and the inner surface of the case, while the biasing force of the first elastic member is acting upon it. [Aspect 2] The aforementioned case is, Outer case and It comprises an inner case housed within the outer case, in which the cylinder is housed so as to be able to move back and forth, The door stopper body according to embodiment 1, further comprising a pair of second elastic members provided between the outer surface of the inner case and the inner surface of the outer case, and arranged facing each other with the inner case in between, thereby biasing the inner case in the horizontal direction. [Aspect 3] The door stopper body according to embodiment 1 or 2, wherein the cylinder has a smaller diameter at one end than at the other end. [Aspect 4] The door stopper body according to embodiment 1 or 2, wherein the cylinder is cylindrical in shape and houses the magnetic member inside. [Aspect 5] A door stopper comprising a door stopper body as described in any of embodiments 1 to 4, and a door stopper receiving portion provided on the floor surface. [Explanation of symbols]

[0061] CL1, CL2, CL3 Clearance, F Floor surface, 1 Door body, 3 Door stopper main body, 4 Door stopper receiving part, 10 Door stopper, 30 Case, 31 Outer case, 32 Inner case, 33 Cylinder, 34 Magnetic member, 35 First elastic member, 36, 36 Second elastic member

Claims

1. A door stopper body provided at the lower end of the door frame, The case and, A cylinder housed within the case so as to be able to move back and forth, with one end protruding from the lower surface of the case, A first elastic member is provided on the outer circumference of the cylinder and biases the cylinder upward against its own weight, The cylinder is provided with a magnetic member that, by magnetic force, pulls the cylinder toward a door stopper receiving portion provided on the floor surface, The cylinder is a door stopper body that is housed in the case with a clearance between its other end and the inner surface of the case, while the biasing force of the first elastic member is acting upon it.

2. The aforementioned case is, Outer case and It comprises an inner case housed within the outer case, in which the cylinder is housed so as to be able to move back and forth, The door stopper body according to claim 1, further comprising a pair of second elastic members provided between the outer surface of the inner case and the inner surface of the outer case, and arranged facing each other with the inner case in between, thereby biasing the inner case in the horizontal direction.

3. The door stopper body according to claim 1 or 2, wherein the cylinder has a smaller diameter at one end than at the other end.

4. The door stopper body according to claim 1 or 2, wherein the cylinder is cylindrical in shape and houses the magnetic member inside.

5. A door stopper comprising a door stopper body portion as described in claim 1 or 2, and a door stopper receiving portion provided on the floor surface.

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