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| Variable capacitor for use in a keyboard |
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| Protective case and keyboard system for a handheld computer |
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| Architecture for data processor |
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| Keyboard for an electronic musical instrument employing variable capacitors |
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Safety device actuatable by seismic vibrations
| Details |
Inventors: Yamaura, Yoshitomo; Kobayashi, Takayoshi; Asanuma, Akira; Miyazawa, Kuichiro;
Assignee: Kabushiki Kaisha Shinko Seisakusho (Nagano, JA)
Primary Examiner: Scott; James R.
Assistant Examiner:
Attorney, Agent or Firm:
An apparatus actuated by seismic vibrations and other vibrations is disclosed. A vertically or substantially vertically movable rod, a weight or mass in engagement or capable of engagement with the rod and a plurality of pivotable stays or support arms supporting the weight are provided within a housing, and held in a mechanically balanced state in their entirety. When the apparatus undergoes seismic or other vibrations, the mechanical balance is disturbed, whereupon the weight is released from the support arms and allowed to fall together with the vertically movable rod due to the gravitational force, thereby effecting the switching of a related fluid or electric circuit. |
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DETAILED DESCRIPTION OF THE INVENTION Referring now to FIG.
1, there is shown a first embodiment of the apparatus actuated by vibrations.
A vertically or substantially vertically movable rod 12 penetrates a coaxial cylindrical housing 10.
The lower end of the rod 12 is provided with a non-illustrated microswitch or a valve, or may operate an external microswitch or valve 78.
A stay mount 14 concentric with the rod 12, as most clearly shown in FIG.
2, is secured to the bottom of the housing 10.
Three stays 16 radially spaced apart at a uniform angular intervals of 120 degrees with respect to the axis of the stay mount 14 are pivoted thereto by respective pins 18.
These stays 16 are provided at their intermediate position with respective inner protuberances 20 best seen in FIG.
1.
A weight 22 is supported at three points on its outer periphery by upper portions of the individual protuberances 20.
The weight 22 has a central through bore 24 penetrated by the rod 12.
The bore 24 has a downwardly flaring lower portion 25.
A weight support member 26 of a conical shape extends within the bore 24 and the bore portion 25 of the weight 22 and is secured to the rod 12.
When the weight 22 is released from the stays 16, it is adapted to engage a weight support member 26.
Adjustment means 28 associated with respective stays 16 are mounted on the housing 10.
Each adjustment means 28 includes a sleeve 30 secured to the peripheral wall of the housing 10 at a position corresponding to the protuberance of the associated stay 16, a pusher member 32 slidably fitted in the sleeve 30, a compression spring 34 biasing the pusher member 32 toward the stay 16, and an adjustment screw screwed into the sleeve 30 at an outer opening thereof and capable of manipulation for adjusting the spring pressure.
The individual stays 16 are urged inwardly by the respective pusher members 32 with the biasing force of the slide spring 34, whereby the weight 22 is held supported on the protuberances 20 of the stays 16.
Designated as 38 is a keeper member secured to an upper portion of the rod 12 and having a lower stepped portion 40
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