JPH0620476Y2 - Toilet seat open / close restraint mechanism - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an opening / closing mechanism for a toilet seat and a toilet lid provided in a seated flush toilet bowl.

[Conventional technology]

It is common practice to attach only a toilet seat or a toilet seat and a toilet lid to a seat-type flush toilet so that it can be opened and closed. For these toilet seats and lids, the simplest structure is one in which the base ends thereof are connected to the toilet body by a hinge mechanism.

In this hinge mechanism, the base end portions of the toilet seat and the toilet lid are connected to the hinge portion of the toilet body by a shaft such as a pin. The toilet seat and the toilet lid are integrally connected to the pin or rotatable, and are freely rotatable with respect to the hinge portion of the toilet body.

By the way, recently, a toilet body having a sanitary washing device having a local washing function has come into general use. This sanitary washing device is attached in a state of being mounted on the upper surface of the toilet body on the rear side, and the base ends of the toilet seat and the toilet lid are extremely close to the casing of the sanitary washing device. Therefore, particularly in toilet bowls equipped with sanitary washing devices, a structure has been adopted in which the hinge shafts of the toilet seat and the toilet lid are connected to the casing.

[Problems to be solved by the device]

FIG. 11 is a schematic view of a sanitary washing device with a hinge mechanism connected to the casing. In the figure, a hinge shaft 51 attached to a base end portion 50 of a toilet seat or a toilet lid is inserted into and supported by a casing 53 of a sanitary washing device provided in a toilet body 52.

Also, in order to keep the toilet seat and toilet lid upright,
2. Description of the Related Art Conventionally, a stand-up holding mechanism is used.
Examples of the upright holding mechanism include one in which a protrusion is provided on the peripheral surface of the base end portion 50 to elastically engage with the toilet body. Further, as shown in the figure, a cam 54 is attached to one end of the hinge shaft 51, and a restraining body 55 that abuts on the peripheral surface of the cam 54 is spring-loaded.
Elastic support by 56 is also commonly performed.

By bringing the restraint body 55 biased by the spring 56 into contact with the peripheral surface of the cam 54, the restraint body 55 regulates the rotation of the cam 54 when the hinge shaft 51 rotates at a certain angle. Can be restrained. Therefore, if this restraint position is made to correspond to the standing position of the toilet seat and the toilet lid, these are held in the standing posture.

However, since the casing 53 is a closed space,
The assembly work for attaching the cam 54 after inserting the hinge shaft 51 becomes very complicated, and there is ample room for improvement in terms of productivity. In addition to the assembling work, a space occupied by the cam 54, the restraining body 55, and the spring 56 is required, and the degree of freedom in design such as increasing the internal capacity of the casing 53 is restricted. Further, the cam 54, the restraint body 55 and the spring
Since 56 individual items are incorporated as separate parts, an increase in product cost cannot be avoided.

Therefore, the present invention aims to solve the above-mentioned problems of the conventional structure and provides an opening / closing mechanism capable of keeping the toilet seat and the toilet lid upright with a simple structure.

[Means for Solving the Problems]

The present invention is an opening / closing mechanism in which a casing has a resistance mechanism for giving a resistance to a closing operation with respect to a toilet seat, and the opening / closing mechanism inserts and supports a mounting shaft for inserting a mounting seat provided at a base end of the toilet seat. The mounting shaft is provided with a cam portion on a part of its peripheral surface, and a restraining piece for restraining the rotation of the mounting shaft is provided in the casing in correspondence with the position of the cam portion, and the restraining piece is the cam portion. A rollable roller that is urged toward the peripheral surface of the roller by elastic means and abuts against the cam portion, and the toilet seat can be restrained in each standing posture by engagement of the roller and the cam portion. Is characterized by.

〔Example〕

Hereinafter, the features of the present invention will be specifically described with reference to the embodiments shown in the drawings.

FIG. 1 is a partially cutaway plan view showing an essential part of an opening / closing mechanism in which the base ends of a toilet seat and a toilet lid are connected, and FIG. 2 is a view taken along the line II of FIG.

In this embodiment, as shown in FIG. 9, a sanitary washing device B having a washing function is provided in the toilet body A, and an opening / closing mechanism is arranged in the casing thereof. Then, as shown in FIG. 10, the left and right sides of the toilet seat 1 and the toilet lid 2 are connected to the sanitary washing device B. That is, toilet seat 1
A pair of mounting seats 1a, 2a connected to the opening / closing mechanism M are formed on the left and right at the respective base ends of the toilet seat 2 and the toilet lid 2. The seats 1a, 2a and the mounting shaft 3 form the toilet seat 1 and the toilet lid 2 respectively. Is connected to the opening / closing mechanism M.

As shown in FIG. 3 (a), the mounting shaft 3 is a rod made of synthetic resin with a reduced diameter, and its cross section orthogonal to the axis is
As shown in FIG. 3 (b) (a cross section taken along the line II-II in FIG. 3 (a)), it has a substantially oval shape with straight lines and curved lines. Then, a cam portion 3a which is point-symmetrical with respect to the center of the cross section is formed on the peripheral surface of the portion deviated from the center in the axial direction toward the tip side.

Mounting seats 1a, 2 for the toilet seat 1 and the toilet lid 2 through which the mounting shaft 3 is inserted
The cross-sectional shape of each insertion hole 1b, 2b of a is
It differs as shown in FIG. 4 depending on the arrangement on the left and right. That is, the mounting seats 1a, 2a on the right side in FIG. 10 are shown in FIGS.
In this case, the insertion hole 1b on the toilet seat 1 side is circular with the arc surface of the mounting shaft 3 as a radius, and the insertion hole 2b of the toilet lid 2 has an oval cross section into which the mounting shaft 3 is fitted. Further, FIGS. 4 (c) and (d) show the case of the left mounting seats 1a and 2a, and conversely, the toilet seat 1
The insertion shaft 1 is fitted with the mounting shaft 3, and the insertion hole 2b of the toilet lid 2 has a circular cross section.

Due to the cross-sectional shape of such insertion holes 1b, 2b, on the right side,
The toilet seat 1 rotates freely around the mounting shaft 3, and the toilet lid 2 mounts on the mounting shaft 3.
Rotate with. On the other hand, on the left side, the toilet seat 1 rotates integrally with the mounting shaft 3, and the toilet lid 2 rotates independently of the mounting shaft 3.

The opening / closing mechanism M mainly includes the casing 4 fixed to the base B-1 of the sanitary washing device B. As shown in FIG. 5 (a), a supporting boss B-2 for receiving the fixing piece 4a provided on the casing 4 is formed at a predetermined position on the base B-1 and its upper end is provided with a hole 4b of the fixing piece 4a. Is fitted to. Further, the support boss B-2 is provided with an elastic sleeve 5 which receives the lower surface of the fixed piece 4a and has a cushioning function. Then, the casing 4 has its fixed piece 4a fixed to the support boss B-2 by the screw 4c and the washer 4d.

Thus, by disposing the sleeve 5 having a cushioning function between the lower surface of the fixed piece 4a and the base B-1, the entire opening / closing mechanism M can be elastically supported with respect to the sanitary washing device B. Further, since the upper end of the support boss B-2 is fitted into the hole 4b of the fixed piece 4a, the positioning at the time of assembly can be simplified.

As is clear from FIG. 5 (b), the casing 4 has a double pipe structure in which an annular inner layer wall 6 is formed. A slit 6a running in the axial direction of the casing 4 is cut at two upper and lower portions of the inner layer wall 6, and a protrusion 6b having a circular vertical cross section is axially projected at the center of the inner end wall of the casing 4.

Furthermore, inside the casing 4, as shown in FIG.
A rotor 7 that gives resistance to the rotation of the toilet seat 1 and the toilet lid 2 transmitted from the mounting shaft 3 and a joint 8 that connects the mounting shaft 3 to the opening / closing mechanism M are arranged.

The rotor 7 provides a resistance when the toilet seat 1 and the toilet lid 2 are closed, and functions as a resistance mechanism capable of setting a gentle operation. That is, the rotor 7 has a double-pipe structure having a two-layer wall that is embedded between the inner peripheral wall of the casing 4 and the inner layer wall 6 and the inner peripheral side of the inner layer wall 6, and has a tubular shape at the center of the inside. The rib 7a is formed so as to be coaxial with the casing 4. Then, an O-ring 7b is provided between the casing 4 and the joint 8, and the inner peripheral wall and the inner layer wall 6 of the casing 4 are provided.
The interior and exterior walls of the are isolated from the outside, and grease or the like is enclosed inside. This grease is filled in a large area between the entire inner layer wall 6 and the inner peripheral wall of the casing 4 and the rotor 7,
The rotor 7 with respect to the casing 4 depends on the viscosity of the grease.
Acts as a resistance to rotation.

The tip of the joint 8 is inserted inside the rib 7a of the rotor 7, and the joint 8 and the rotor 7 can freely rotate with respect to each other. The outer diameter of the rib 7a is equal to the outer diameter of the joint 8 on the tip end side, and metal rings 9a and 9b are integrated at the portions joined to the ends of the rib 7a. These rings 9a, 9b are also set to have the same outer diameter as the rib 7a, and a coil spring 10 is fitted in the middle portion of the joint 8 from the base end of the rib 7a. The joining by the coil spring 10 is used as a clutch mechanism. There is.

As shown in Fig. 6 (a), the coil spring 10 is left-handed (helix-shaped spirally wound counterclockwise about the axis of the spring). It is incorporated in the mechanism M. The heat-treated wire made of steel or the like that constitutes the coil spring 10 has a flat cross section. Further, in FIG. 10, the opening / closing mechanism M located on the right side is right-handed (wound spirally in the clockwise direction around the axis of the spring) as shown in FIG. 6 (b).
The coil spring 10 is incorporated.

By providing these coil springs 10 in the opening / closing mechanism M, when the toilet seat 1 or the toilet lid 2 and both of them are raised, the rotation of the mounting shaft 3 is not transmitted to the rotor 7.
That is, in the case of the opening / closing mechanism M on the left side of FIG. 1, the mounting shaft 3 rotates clockwise when viewed from the center side of the toilet seat 1 and the toilet lid 2,
The coil spring 10 is loaded with an acting force opposite to the winding direction. As a result, the inner diameter of the coil spring 10 expands, the torque transmission between the joint 8 and the rotor 7 slips, and the rotation from the mounting shaft 3 to the rotor 7 is not transmitted. On the other hand, in the case of the opening / closing mechanism M located on the right side in FIG. 10, when the toilet seat 1 and the toilet lid 2 are opened, the mounting shaft 3 rotates counterclockwise when viewed from the center side thereof. Then, since the coil spring 10 is applied with the acting force in the direction opposite to the winding direction, slippage is similarly caused due to the enlargement of the inner diameter, and rotation cannot be transmitted.

FIG. 7 (a) is a joint 8 taken along the line III-III in FIG.
FIG.

The joint 8 is formed with an insertion hole 8a in the axial direction into which the tip of the mounting shaft 3 is inserted. The insertion hole 8a has an opening cross-sectional shape that allows the mounting shaft 3 having a substantially oval cross section to freely rotate around its axis by a constant angle. That is, a curved portion having the same shape as the circular arc portion of the mounting shaft 3
8b and a pair of fan-shaped straight line portions 8c whose central portions are constricted, and the mounting shaft 3 is provided with a certain angle of play around its axis as shown in FIGS. 7 (b) and (c). You can Therefore, even if the mounting shaft 3 rotates within the angular range included in this play, the rotation of the mounting shaft 3 is not transmitted to the joint 8. Then, when the linear portion of the mounting shaft 3 comes into contact with the linear portion 8c of the insertion hole 8a (FIGS. 7B and 7C), the joint 8 rotates together with the rotation of the mounting shaft 3. .

Further, a restraining cap 11 of the mounting shaft 3 is detachably provided outside the casing 4 so as to be coaxial with the joint 8. As shown in FIGS. 1 and 2, the restraint cap 11 is an annular body having a hook 11a that engages with a claw 4e protruding from the peripheral surface of the casing 4.

Inside the restraint cap 11, FIG. 8 (a) (IV-IV in FIG. 1)
(Cross-sectional view taken along the line), the cam portion of the mounting shaft 3
A pair of restraint pieces 12 for restraining the peripheral surface of 3a and a roller piece for rotatably incorporated therein to minimize wear of the contact surface.
It contains 12a. These restraining pieces 12 are rotatably pivotally attached at their proximal ends to the restraining cap 11 and are rotatable in the direction of the arrow in the figure. Then, springs 13 for urging the restraint pieces 12 in the circumferential direction of the mounting shaft 3 are connected to each other, and the urging force restricts the rotation of the mounting shaft 3.

Here, when the mounting shaft 3 is inserted into the joint 8 from the restraint cap 11, the cam portion 3a of the mounting shaft 3 is set at a position corresponding to the roller piece 12a of the restraint piece 12 of the restraint cap 11 as shown in FIG. To be done. The cam portion 3a of the mounting shaft 3 is shown in Fig. 3 (b).
As described above, the linear portion 3b and the curved portion 3c having an oval cross section are provided, and as shown in FIG.
It is clamped by 12a. Therefore, when the linear portion of the mounting shaft 3 faces the roller piece 12a, the rotation of the mounting shaft 3 is restricted. Therefore, by utilizing this, the restraint cap 11 can serve as a restraint mechanism for holding the toilet seat 1 in the upright position.

The opening / closing mechanism M including the above elements is also arranged on the right side in FIG. In this case, the seat 1 for the toilet seat 1 and the toilet lid 2
The relationship between the insertion holes 1b and 2b of a and 2a and the mounting shaft 3 is as described in FIGS. 4 (a) and 4 (b). However, the toilet lid 2 is a toilet bowl A
Even if it is leaned against the tank, it does not fall in the closing direction due to its own weight, so it does not require a restraint mechanism,
Therefore, the restraint piece 12 and the roller piece 12a are not incorporated in the restraint cap 11. However, all other features are similar to the left feature.

In the above configuration, when only the toilet lid 2 is raised, the fourth
As shown in FIG. 3B, the insertion hole 2b of the right mounting seat 2a and the mounting shaft 3 are in a fitted state, while the left side is loosely fitted, so that the mounting shaft 3 of the right opening / closing mechanism M is It rotates together with the toilet lid 2. That is, when only the toilet lid 2 is opened and closed, only the right opening / closing mechanism M is involved in the operation, and the toilet lid 2 is freely rotated with respect to the mounting shaft 3 connected to the left opening / closing mechanism M.

On the other hand, the mounting shaft 3 from the closed state of the toilet seat 1 to the standing state thereof rotates as shown in FIGS. 7 and 8. In these drawings, each of (a) shows the case where the toilet seat 1 is closed, and the straight portion 3b of the mounting shaft 3 is in a vertical posture.

When the toilet seat 1 is erected from this closed state, the mounting shaft 3
Rotates clockwise in FIGS. 7 (a) and 8 (a). At this time, the cam portion 3a of the mounting shaft 3 pushes the restraining piece 12 and the roller piece 12a to continue the rotation, and the joint 8
The tip portion of the inserted part changes its posture as shown in FIG. 7 (b). That is, since the insertion hole 8a of the joint 8 gives a play to the mounting shaft 3 having an oval cross section, FIG.
As shown in (b), the linear portion 3b of the mounting shaft 3 is the linear portion 8c of the insertion hole 8a.
The rotation is not transmitted to the joint 8 until it comes into contact with. Therefore, the load at the time of starting to open the toilet seat 1 is only required for the cam portion 3a to rotate against the spring 13, and thus light handling is possible.

Next, when the toilet seat 1 is further raised, the rotational force is transmitted to the joint 8 and the joint 8 tries to rotate. On the other hand, the coil spring 10 of the opening / closing mechanism M on the left side is
It is wound counterclockwise when viewed from the center side. Therefore, since the joint 8 rotates in the clockwise direction, when the joint 8 rotates, an acting force opposite to the winding direction is applied to the coil spring 10 in the circumferential direction. As a result, the inner diameter of the coil spring 10 is increased, the degree of fitting with the joint 8 and the rotor 7 is reduced, and the transmission of the rotational force between them is interrupted.

As described above, by utilizing the deformation of the coil spring 10, the casing 8 of the joint 8 is put into an idle state, and the mounting shaft 3 is not loaded with resistance by the casing 4 and the rotor 7. Therefore, there is no resistance when opening the toilet seat 1, and the toilet seat 1 can be set to the standing position with a light operation. In the opening / closing mechanism M on the right side, as shown in FIG.
Since the mounting shaft 3 can rotate within the insertion hole 1b of the mounting seat 1a, it freely rotates when the toilet seat 1 rotates.

When the toilet seat 1 stands up, as shown in FIG. 8 (c),
The roller piece 12a of the restraint piece 12 of the restraint cap 11 is the cam portion 3a.
Abutting on the straight line portion 3b. The roller piece 12a is a spring 1
The urging force of 3 squeezes the linear portion 3b to restrain the rotation of the mounting shaft 3 due to the rotation moment of the toilet seat 1. For this reason,
The toilet seat 1 is held in its upright position and can be self-supporting. Therefore, it is possible to stand still so as to take a posture of an appropriate standing angle.

Next, when the toilet seat 1 is closed, the toilet seat 1 is pushed downward with a force to release the restraint of the mounting shaft 3 by the roller piece 12a. At this time, the mounting shaft 3 rotates counterclockwise in FIGS. 7 (d) and 8 (c).

Here, from the standing point up to a certain angle, the play between the joint 8 and the mounting shaft 3 causes a quick operation without receiving resistance from the casing 4 and the rotor 7. That is, during the transition from the state of FIG. 7 (d) to (c), the mounting shaft 3 which rotates integrally with the toilet seat 1 due to the shape of the insertion hole 8a in the joint 8 idles in the joint 8. Then, as shown in FIG. 7 (c), the linear portion 3 of the mounting shaft 3 is
The rotation from the mounting shaft 3 is transmitted to the joint 8 only when b comes into contact with the straight portion 8c of the insertion hole 8a. Therefore, in the area of the angle α shown in FIG. 7 (c), the toilet seat 1 makes a movement similar to a natural fall, and rotates in the closing direction at a high rotation speed without receiving resistance.

Further, after the state shown in FIG. 7 (c), the joint 8 is rotated counterclockwise by the mounting shaft 3.
At this time, the coil spring arranged between the rotor 7 and
10 receives the acting force in the winding direction from the peripheral surface of the joint 8. Therefore, the coil spring 10 is deformed so that the inner diameter thereof becomes small, the fitting portions of the joint 8 and the rotor 7 are strongly pressed, and the rotational force can be transmitted from the joint 8 to the rotor 7. Then, when the rotor 7 rotates in the casing 4, the resistance of the enclosed grease acts. As a result, the toilet seat 1 rotates quickly in the region of the angle α, but thereafter, the speed is attenuated by this resistance, then becomes a substantially constant low speed, and the toilet seat 1 is gently placed on the upper surface of the toilet bowl A.

As described above, when the toilet seat 1 is closed, the toilet seat 1 quickly rotates in a certain angle range from the standing state, and then slowly descends. Therefore, the time until the toilet seat 1 is closed is
It is shorter than in the case where the resistance always acts from the beginning. Also, when it reaches the surface A of the toilet, the casing 4
Since the resistance by the rotor 7 is acting, it operates gently. Therefore, it is possible to use the seat 1 quietly without giving a shock to the toilet seat 1 or generating a hitting sound.

Further, when both the toilet seat 1 and the toilet lid 2 are erected, the same operation as described above can be performed by the functions of the left and right opening / closing mechanisms M. It goes without saying that the toilet seat 1 behaves in the same manner as described above. Then, with respect to the toilet lid 2, a cushioning operation is performed when the toilet lid 2 is closed by the opening / closing mechanism M on the right side.

As shown in FIG. 4 (b), the toilet lid 2 has a mounting shaft 3 fitted in an insertion hole 2 b of its mounting seat 2 a, and the toilet seat 1 is attached to the mounting shaft 3 as shown in FIG. 4 (a). Free rotation is possible. Therefore, the opening / closing mechanism M on the right side is involved only in opening / closing the toilet lid 2, and its operation is exactly the same as that described in the case of the toilet seat 1. That is, when the toilet lid 2 is raised, the resistance is eliminated by utilizing the expansion of the inner diameter of the coil spring 10, and when the toilet lid 2 is closed, the resistance from the casing 4 and the rotor 7 is first received before moving toward the toilet seat 1 quickly. Performs a gradual closing operation.

When the toilet lid 2 is kept upright and only the toilet seat 1 is closed, only the opening / closing mechanism M on the left side operates. this is,
This is because the mounting shaft 3 is rotatable with respect to the insertion hole 1b on the right side of the toilet seat 1 as shown in FIG. 4 (a), so that the opening / closing mechanism M on the right side does not interlock with the operation of the toilet seat 1. It goes without saying that the opening / closing mechanism M on the right side of the toilet seat 1 and the left side of the toilet lid 2 can be interlocked with each other depending on the relationship between the mounting shaft 3 and the insertion holes 1b and 2b of the toilet seat 1 and the toilet lid 2, respectively. Yes.

Further, as shown in FIGS. 1 and 2, the end surface of the mounting shaft 3 is constrained by the projection 2c provided on the toilet lid 2.

The opening / closing mechanism M is fixed to the base B-1 by a sleeve 5 having a cushioning function. Therefore, the impact or the like due to the opening / closing operation of the toilet seat 1 and the toilet lid 2 is absorbed, and the vibration applied to the sanitary washing device B can be damped. Therefore, the degree of impact on the equipment provided in the sanitary washing device B also decreases,
Rattling of members is also eliminated.

[Effect of device]

In the present invention, a restraint piece for restricting the rotation of the cam portion of the mounting shaft provided at the base end portion of the toilet seat is provided in the casing of the opening / closing mechanism, and the roller provided in the restraint piece is used for the cam portion by utilizing the biasing force of the elastic means. And hit it.

Therefore, the casing not only houses the opening / closing mechanism, but also serves as the upright holding function of the toilet seat, so that the overall size of the apparatus can be reduced. Therefore, the casing of the opening / closing mechanism is also compact, and it is possible to eliminate the interference of layout with peripheral devices even if it is incorporated in the sanitary washing device, for example.

Furthermore, since the rolling roller provided on the restraint piece only abuts on the cam portion, wear on the peripheral surface of the cam portion is suppressed, and since no unreasonable force acts on the restraint piece, durability is also improved. improves.

[Brief description of drawings]

1 is a partially cutaway plan view of an opening / closing mechanism showing an embodiment of the present invention, FIG. 2 is a view taken along the line II of FIG. 1, and FIG.
(a) is a front view of the mounting shaft, and FIG. 3 (b) is II-II of FIG. 3 (a).
4 is a sectional view showing a mounting shaft, a toilet seat and a mounting seat of a toilet lid, FIG. 5 (a) is a partial cutaway view showing the casing installation of the opening / closing mechanism, and FIG. 5 (b) is a sectional view. It is a notch top view of a casing. Further, FIG. 6 is a perspective view of a coil spring having a clutch function, FIG. 7 is a sectional view showing the behavior of the joint due to rotation of the mounting shaft, and FIG. 8 is a sectional view showing the arrangement of the mounting shaft and the restraining cap. FIG. 9 is a perspective view showing an example in which a toilet seat and a toilet lid are connected to a sanitary washing device provided in the toilet body,
FIG. 10 is a plan view showing the arrangement of the opening / closing mechanism for the toilet seat and the toilet lid, and FIG. 11 is a schematic view of a conventional standing posture holding mechanism for the toilet seat and the toilet lid. 1: toilet seat, 1a: mounting seat 1b: insertion hole, 2: toilet lid 2a: mounting seat, 2b: insertion hole 3: mounting shaft, 3a: cam part 4: casing, 4a: fixed piece 5: sleeve, 6: inner layer Wall 6a: Slit, 7: Rotor 8: Joint, 8a: Insert hole 10: Coil spring 11 Restraint cap, 12: Restraint piece 12a: Roller piece, 13: Spring A: Toilet body, B: Sanitary washing device B-1 : Base, B-2: Support boss M: Open / close mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Tetsuhiro Katamune 5-1-1, Kuchiamihigashi, Oguraminami-ku, Kitakyushu, Fukuoka Prefecture, Toko Kikai Co., Ltd. Ogura No.2 Factory (72) Inventor, Mutsuro Kurosaki Yokohama, Kanagawa Prefecture 184-1 Maioka-cho, Totsuka-ku, Niico, Ltd. (72) Inventor Masanobu Kawamoto 184-1 Maioka-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture (72) Inventor, Nifco (72) Co., Ltd. Akihiko Nakajima Totsuka-ku, Yokohama-shi, Kanagawa Maedacho 100 Koito Industry Co., Ltd. (72) Inventor Masahide Suzuki Maedacho 100 Toda Ward, Yokohama City, Kanagawa Prefecture Koito Industry Co., Ltd. (56) Reference JP-A-60-106423 (JP, A) Actual Open Sho 62-31491 (JP, U) Actual Open Sho 60-56396 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An opening / closing mechanism in which a casing has a resistance mechanism for giving a resistance to a closing operation with respect to a toilet seat, and the opening / closing mechanism inserts and supports a mounting shaft for inserting a mounting seat provided at a base end of the toilet seat. The mounting shaft is provided with a cam portion on a part of its peripheral surface, and a restraining piece for restraining the rotation of the mounting shaft is provided in the casing corresponding to the position of the cam portion, and the restraining piece is the cam. A rollable roller that is urged toward the peripheral surface of the portion by elastic means and abuts against the cam portion, and the toilet seat can be restrained in each standing posture by engagement of the roller and the cam portion. A mechanism for restraining opening and closing of a toilet seat, which is characterized in that