JPS5912247Y2 - Seal ring for bridge sliding bearings that prevents rubber from extruding - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rubber extrusion-preventing seal ring for bridge sliding bearings.

The purpose of this is that when a sliding part is provided on one end surface in the axial direction of the rubber annular body to reduce the frictional resistance between it and the upper shoe and prevent deformation of the ring when moving the bridge girder, the bridge girder can be attached to the upper shoe. Due to the load at the time of installation or due to the deflection of the bridge girder, the sliding part pushes the rubber body inwards and outwards and crawls into this main body, and the rubber in the pushed part moves between the sliding part and the upper shoe. It bulges outward from the contact surface and finally comes into contact with the upper shoe surface, and like conventional seal rings without sliding parts, it deforms due to frictional resistance with the upper shoe when the bridge girder moves, creating a gap between the seal ring and the upper shoe. This is to prevent rainwater, dust, etc. from entering the bearing and impairing the bearing's function.

The structure of the present invention is characterized in that a sliding part is provided on one end surface in the axial direction of the rubber annular body, and the width of the main body is made smaller in cross section than the width of the sliding part. Even when a load is applied to the surface of the part, the rubber does not protrude outward from the surface of the processed part, and the processed part always slides against the upper shoe, keeping the frictional resistance to the movement of the bridge girder as low as possible, and preventing girder movement. This can prevent deformation of the seal ring caused by the deformation of the seal ring.

The embodiment of the present invention will be described in detail below with reference to the drawings.

Note that the same reference numerals indicate the same or corresponding parts.

In FIG. 1, 1 is a rubber annular main body, and 2 is a sliding portion provided on the upper end surface 3 of the main body 1 in the axial direction.

The width W of the main body 1 is smaller than the width W' of the sliding portion 2 in a cross section taken along a plane including the axis.

If the sliding part is formed by providing an annular plate 21 made of tetrafluoroethylene resin on the upper end surface 3 in the axial direction of the main body 1, it can be easily adhered to the main body 1, and it can be crimped at the same time when the main body 1 is shaped. This allows for more secure adhesion.

Therefore, the rubber main body 1 can easily follow the deformation of the rubber body 1 due to the inclination of the upper shoe when the bridge girder is deflected due to vibrations, etc., and there is almost no possibility of it peeling off.

The width in cross section of the main body 1 is adapted to the width W' of the processed part 2 at the upper end of the main body 1, that is, on the side of the sliding part 2, and at the lower end, there are curved parts 22 on both the inner and outer surfaces that are continuous with the sliding part 2. 23, the width is smaller than the width W' of the sliding portion 2.

FIG. 3 shows another embodiment of the ring according to the present invention.

The main body 1 has a cross-sectional shape of a rectangular quadrilateral, that is, a square or a rectangle, and is located approximately at the center of the width W' of the processed portion on the side of the sliding portion 2.

Therefore, spaces S1 and S2 are prepared below both ends of the processed part 2 in the direction of the width W', and when the main body 1 and the processed part 2 are integrally molded, the burr 2 inevitably protrudes outward from the joint between the two.
4 and 25 do not need to be removed as long as they are within these spaces S1 and S2.

That is, even if the burrs 24 and 25 remain, the performance as a seal ring is not impaired in any way, and there is no need for deburring work.

FIG. 4 shows yet another embodiment of the ring according to the present invention.

In cross section, the sliding portion 2 is U-shaped with a groove 26, and the main body 1 is a quadrilateral with four right angles, that is, a square or a rectangle.

The upper end of the main body 1 enters into the groove 26 of the processed portion 2, and both sides are covered by sleeve pieces 27 and 28.

Therefore, even if the main body 1 is extremely compressed and deformed, direct contact between the main body 1 and the upper shoe can occur, and the function of the sliding part 2 can be fully exerted.

Further, as in the case of FIG. 3, if the amount of protrusion of the burrs 29 and 30 is small, deburring is not necessary.

Place these seal rings in the bearing bearing 3 as usual.
A bearing plate 34 is placed between the upper shoe 32 and the lower shoe 33 of 1.
and secure it to the lower shoe 33.

When the sliding part 2 is pressurized by the load of the bridge, the main body 1 undergoes compressive deformation, but the amount of deformation does not exceed the upper surface of the working part 2.

Furthermore, when the upper shoe 32 moves due to expansion and contraction of the bridge girder, even if the sliding part 2 on the upper surface of the main body 1 is in contact with the upper shoe 32, the main body 1
Frictional force that causes excessive deformation does not act, and no gap is created between the upper shoe 32 and the processed part 2.

According to the present invention, a sliding part is provided on one end surface in the axial direction of the rubber annular body, and the width of the main body is made smaller in cross section than the width of the sliding part, so that the main body is compressed by the load when the shoe is completed. Even if deformation occurs, the amount of deformation will not protrude outward from the surface of the sliding processed part, and this processed part is always in contact with the upper shoe to prevent excessive deformation of the main body when moving the bridge girder. This has the effect of preventing rainwater, dust, etc. from entering the bearing, and allowing the bearing to fully perform its function over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing a specific example of the seal ring according to the present invention, Fig. 2 is a partially cutaway side view of this ring used as a support, and Fig. 3 shows another embodiment of the seal ring of the present invention. FIG. 4 is a partially cutaway slope view of still another aspect of the same. 1...Rubber annular body, 2...Sliding part, 21...Tetrafluoroethylene resin annular plate, 22. 23... Curved portion, 26...
groove.

Claims (5)

[Scope of utility model registration request] (1) Rubber extrusion prevention type bridge sliding bearing characterized by providing a sliding part on one end surface in the axial direction of the rubber annular body and making the width of the main body smaller in cross section than the width of the sliding part. seal ring. (2) The sliding part has a cyclic tetrafluoroethylene resin plate provided on the one end surface of the utility model registration claim No. (2)
A seal ring for bridge sliding bearings that prevents rubber from extruding as described in item 1). (3) In the cross section, the width of the main body matches the width of this processed part on the sliding processed part side, and becomes smaller than the width of the sliding processed part on the other end side through the curved parts on both the inner and outer surfaces that are continuous from the sliding processed part side. A rubber extrusion-preventing seal ring for bridge sliding bearings as set forth in claim 1 or 2 of the registered utility model. (4) The rubber body according to claim 1 or 2 of the utility model registration, wherein the main body is a rectangular quadrilateral in cross section and is located approximately at the center of the width of the sliding portion on the side of the sliding portion. Seal ring for bridge sliding bearings that prevents extrusion. (5) In cross section, the sliding part is U-shaped with a groove, and the main body is a quadrilateral with four right angles, and a part of this main body fits into the groove of this processed part.Claim No. 1 of Utility Model Registration
Or a seal ring for bridge sliding bearings that prevents rubber from extruding as described in (2).