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| Multi-point high security locking mechanism for lottery machines |
| It is therefore an object of the present invention to provide a locking mechanism for a lottery ... |
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| Safety door and safety apparatus for installation in a door |
| It is an object of the present invention to provide a generic safety door or an apparatus for ... |
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| Multiple lock assembly |
| OF PREFERRED EMBODIMENT Referring now to the drawings where the showing is for the purpose of ... |
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| Penetration-resistant security passway and door therefor |
| Accordingly, it is an advantage of the present invention that a penetration-resistant security ... |
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| Upright construction section |
| The present invention comprises a construction section having two upright legs spaced from each ... |
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| Deflector track tabs for positioning studs along the track |
| The present invention provides a method for forming a deflector track structure that includes a ... |
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| Factory layout |
| According to a first aspect of the present invention, there is provided a factory layout comprising ... |
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| Support structure for vacuum duct |
| OF THE PREFERRED EMBODIMENT FIG. 1 illustrates the duct support arm 1 mounted to a grain vacuum 2 ... |
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Laminated rubber vibration control device for structures
| Details |
Inventors: Sakamoto, Mitsuo; Koshika, Norihide; Nishimura, Isao; Sasaki, Katsuyasu; Oorui, Satoshi;
Assignee: Kajima Corporation (Tokyo, JP)
Primary Examiner: Oberleitner; Robert J.
Assistant Examiner: Poon; Peter M.
Attorney, Agent or Firm: Tilberry; James H.
A laminated hollow rubber damper with increased buckling strength and lengthened period of vibration. The buckling strength of a hollow laminated rubber damper is increased by making at least the inside or the outside wall of the damper of non-uniform section, such as obtained with an arcuately concave wall. By taking advantage of the improved buckling strength of hollow laminated rubber dampers, both the deformability in a horizontal direction and the period of the damper are increased. The hollow laminated rubber damper may be used as a spring element in an active or passive type vibration control device, or as a supporting device suitable for the protection of structures having long natural periods, such as multi-storied buildings. |
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DETAILED DESCRIPTION In a first embodiment of the invention, the laminated rubber support of the present invention is ring shaped to make the internal portion thereof hollow.
In addition, the inside wall, the outside wall, or both, may be arcuately concave so as to provide a vertical non-uniform section wherein the widths of horizontal sections will gradually increase from the center portion to the opposite end portions.
By contouring the walls of the structure as above described, it has been found that the buckling strength of the laminated rubber is increased to fully make use of the deformability of the hollow laminated rubber device.
In a second preferred embodiment of the present invention, a plurality of vertically aligned ribs are provided integral with the inside wall, the outside wall, or both walls.
These ribs stiffen the device against buckling so that full use may be made of the deformability of the hollow laminated rubber support.
Normally, steel horizontal connection plates or the like are mounted on the upper and lower portions of these laminated rubber supports, and are used to secure the supports with bolts to upper and lower structural bodies.
The rubber laminations may be separated and reinforced by steel plates interlaid between layers of rubber.
The steel plates may be ring-shaped or disk-shaped.
The disk-type steel plates render the laminated rubber support more stable against an overturning moment or the like, in comparison with the ring-shaped steel plates.
The above-described vibration control laminated rubber support functions as a spring element in either a passive or active type vibration control device.
In use as a dynamic damper, the laminated rubber support is positioned, with like supports at predetermined positions relative to a supported structure, as seismic response control means in conjunction with an additional body of predetermined mass m.
sub.
d mounted on the laminated rubber supports.
It is considered that the mass m.
sub.
d of the additional mass body is within the normal range of 1/50 to 1/100 of a mass m
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