Static structures (e.g. – buildings) – Means compensating earth-transmitted force – Relative motion means between a structure and its foundation
Reexamination Certificate
1999-10-25
2001-05-15
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Relative motion means between a structure and its foundation
C052S167100, C188S322500
Reexamination Certificate
active
06230450
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a damping top (damping mechanism), a damping rod and damping devices using the same which have simple structures and small sizes and also are capable of providing great damping effects.
BACKGROUND OF THE ART
In general, the damping mechanism is provided between two points (objects) relatively displacing to each other, so that a vibration energy to be transferred from one vibration source side to other damping object side is converted into a thermal energy for causing the vibration energy to disappear, thereby achieving the damping effects.
The above mentioned damping mechanism is so structured that parts relatively displacing to each other by vibration are accommodated in a chamber including a viscous material, which is formed in the device, whereby the damping effect is achieved through its viscous and frictional resistance, and further in this case so structured that an amount of displacement of the above mentioned relatively displacing parts is amplified by an amplification means from an actual displacement amount (a displacement amount of two points relatively displacing), whereby the damping effect is thus increased. By the way, the damping effect is proportional to a confronting area to the first power between the two parts relatively displacing (operating to each other) and also to a relative speed to alpha power.
The above mentioned conventional damping mechanism, however, has difficulties to be described below. As described above, the conventional damping mechanism, in general, has means for amplifying the relatively displacing parts, wherein this displacement amplifying means normally comprises a leverage means connected thereto by a hinge-joint. Such the hinge-leverage means is, however, insufficient in amplifying magnification (rate in increase of the confronting area of the relatively displacing parts and the relative speed between them) and also is complicated in structure, whereby the structure is enlarged and accuracy in operation is also dropped.
Accordingly, an object of the present invention is to provide a displacement-amplifying means having a simple and compact structure and being capable of achieving a large amplifying magnification, namely provide a damping device having a simple and compact structure and being capable of achieving a large damping effect.
DISCLOSURE OF THE INVENTION
In order to achieve the above object, a first damping device (damping top) in accordance with the present invention comprises: first and second connective members so connected with each other as to be relatively displaceable ; the first connective member further comprising a first rod formed with a guide screw in its connecting side, a guide nut engaged with the guide screw and axially supported so as to rotate and slide on the guide screw on the basis of a relative displacement from the guide screw, and a disk-shaped rotational body having a sufficiently larger diameter than the first rod and being rotatably and slidably attached thereto through the guide nut; the second connective member further comprising a second rod, and a cylindrically shaped casing formed in its connecting side for accommodating the rotational body and the guide nut, and the damping device is characterized in that a viscous material and/or a viscoelastic material is filled for damping in a gap defined between an inner wall of the cylindrically shaped casing and the rotational body.
The rotational body may so unitary be formed as to extend radially and outwardly from a circumference of the guide nut, or may be provided at a position distanced in an axial direction from the guide nut and also is so formed as to be engaged with one side of the guide nut.
The damping device may be provided between diagonally opposite comers of a frame structure in a building construction, or may be provided between precast members and/or fair-faced constructions in a fair-faced building construction including precasts of concrete, or may be provided between a foundation of a building construction and a fair-faced floor slab, wherein the damping device connects isolated floors through a precast steel extending throughout the isolated floors and also extending along an outermost vertical column of the building which consisting of a plurality of floors.
The second damping device in accordance with the present invention comprises: first and second connective members so connected with each other as to be relatively displaceable; the first connective member further comprising an inner tube formed with a guide screw in its connecting side, and a disk-shaped rotational body engaged with the guide screw and having a sufficiently larger diameter than the inner tube and being attached thereto rotatably and slidably on the basis of a relative displacement from the guide screw; the second connective member further comprising an outer tube, and a cylindrically shaped casing formed in its connecting side for accommodating the rotational body, and the damping device is characterized in that a viscous material and/or a viscoelastic material is filled for damping in a gap defined between an inner wall of the cylindrically shaped casing and the rotational body.
The rotational body may preferably comprise a disk-shaped body and a brimmed part being thinner than the disk-shaped body and extending radially and outwardly from a circumference of the disk-shaped body. The damping device may preferably be so provided as to connect isolated floors through a precast steel extending throughout the isolated floors and also extending along an outermost vertical column of the building which consisting of a plurality of floors.
A damping rod in accordance with the present invention may comprise; first and second connective members so connected with each other as to be relatively displaceable; the first connective member further comprising a first rod formed with a guide screw at least in its connecting side, a guide nut engaged with the guide screw and axially supported so as to rotate and slide on the guide screw on the basis of a relative displacement from the guide screw, and a cylindrically shaped rotational body having a sufficiently larger diameter than the first rod and having a sufficiently larger length in anal direction than a diameter itself and further being rotatably and slidably attached thereto through the guide nut; the second connective member further comprising a cylindrically shaped casing formed in its connecting side for accommodating the cylindrically shaped rotational body and the guide nut, and the damping device is characterized in that a viscous material and/or a viscoelastic material is filled for damping in a gap defined between an inner wall of the cylindrically shaped casing and the cylindrically shaped rotational body.
In this case, the cylindrically shaped rotational body may comprise a cylinder having one end into which the guide nut is inserted and an opposite closed end, wherein one side of the guide nut and the opposite closed end of the are rotatably and axially supported. The cylindrically shaped rotational body may also comprise a tube-like rotational body having one end into which the guide nut is inserted and an opposite opened end, wherein opposite sides of the guide nut are rotatably and axially supported and further the viscous material and/or the viscoelastic material is also filled into a hollow portion of the tube-like rotational body.
The damping device may be provided between diagonally opposite corners of a frame structure in a building construction, so that the damping device is allowed to be compressed and tensed, or may be provided between a foundation and a vibration-isolating construction on the foundation, so that the damping device is allowed to be compressed and tensed.
In the first damping device in accordance with the present invention, the displacement amplifying means comprises a rotational body or a rotational top driven or rotated slidably by the guide nut engaged with the guide screw of the first connective member, for which reason the relat
Arima Fumiaki
Hata Tamotsu
Kimijima Hideo
Kuroda Eiji
Dorsey Dennis L.
Friedman Carl D.
Rosenthal & Osha L.L.P.
Sumitomo Construction Co., Ltd.
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