Patent US4236606A successfully refreshed from Google Patents.
US4236606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction braking type vibration damper
Assignee: SANWA TEKKI Corp A CORP OF JAPAN
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Filing: 1978-11-01
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Granted: 1980-12-02
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Expires: 1998-11-01
Abstract
Abstract A vibration snubber for earthquake protection of piping including an auxiliary cylinder axially slidable in a main cylinder having a large diameter portion. The large diameter portion houses a flywheel which is secured to a rotatable center shaft. One end of the shaft is mounted in a bearing in the cylinder end. The other end is threaded and screwed into a conventional screw nut fixed on one end of the auxiliary case. A spacing collar is provided between the flywheel and the bearing. The inner end surface of the large diameter portion has a chamferred friction bearing surface. A movable wheel is rotatably and slidably mounted on the spacing collar. The movable wheel is cylindrical, concentrically surrounding the flywheel. A spring mounted between a spring-receiving ring on the movable wheel and a spring-receiving flange on the flywheel presses the movable wheel against the flywheel. An annular friction surface corresponding to the friction bearing surface is formed on the movable wheel surface facing the end of the main cylinder. At least one ball rides in corresponding conical recesses in opposing faces of the movable wheel and flywheel. When the movable wheel leads or lags the flywheel by inertia, the ball rides up on the surfaces of the conical recesses, pushing the movable wheel away from the flywheel, causing the friction surfaces to contact each other, thereby slowing the assembly by friction braking. The friction bearing surface axial position can be adjustable.
Inventors
- 👤 Katsuaki Sunakoda
- 👤 Yoshikazu Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:16
CPC Classifications
F; F16; F16L; F16L3/00; F16L3/16; F16L3/20; F16L3/202
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
210 words
A friction braking type vibration snubber comprising a pair of supporting members fitted to make axially reciprocating motions relative each other, one of said members having a friction braking surface; a rotatable flywheel having a first surface, means for converting the relative axial motion of said pair of supporting members to rotary motions of said flywheel, a movable wheel having a second surface facing said first surface and rotatable relative to and with said flywheel and movable in the axial direction toward and away from said braking surface, and means for rotationally interconnecting said movable wheel and said flywheel and for moving said movable wheel axially away from said flywheel and toward engagement with said braking surface upon a difference in rotational speed between said movable wheel and flywheel, said means for interconnecting and moving comprising generally opposed recesses of generally conical cross-section defined in said first and second facing surfaces and at least one ball inserted between said opposed recesses to transmit the rotary motions of said flywheel to said movable wheel to rotate it, said at least one ball allowing the delayed rotations of said movable wheel to said flywheel and said delayed rotations bringing about the direct contact of said movable wheel with said friction braking surface.
Claim 2
Dependent Claim
210 words
A friction braking type vibration snubber comprising a pair of supporting members fitted to make axially reciprocating motions relative each other, one of said members having a friction braking surface; a rotatable flywheel having a first surface, means for converting the relative axial motion of said pair of supporting members to rotary motions of said flywheel, a movable wheel having a second surface facing said first surface and rotatable relative to and with said flywheel and movable in the axial direction toward and away from said braking surface, and means for rotationally interconnecting said movable wheel and said flywheel and for moving said movable wheel axially away from said flywheel and toward engagement with said braking surface upon a difference in rotational speed between said movable wheel and flywheel, said means for interconnecting and moving comprising generally opposed recesses of generally conical cross-section defined in said first and second facing surfaces and at least one ball inserted between said opposed recesses to transmit the rotary motions of said flywheel to said movable wheel to rotate it, said at least one ball allowing the delayed rotations of said movable wheel to said flywheel and said delayed rotations bringing about the direct contact of said movable wheel with said friction braking surface.
Claim 3
Dependent Claim
184 words
The friction braking type vibration snubber according to claim 1 further comprising means for pressing said flywheel and said movable wheel together; and wherein one of said pair of supporting members is a main cylinder, the other of said pair is an auxiliary cylinder inserted in said main cylinder so as to be free to advance and retreat in the axial direction, said friction braking surface being fixed to the inner end surface of said main cylinder; said means for converting said relative axial motions to the rotary motions comprises a screw nut non-rotatably and axially movably mounted in said auxiliary cylinder and a center shaft rotatably in a bearing means at one end in said main cylinder and provided in the other end part with a threaded portion screwed onto said screw nut, said flywheel being secured to this center shaft, said movable wheel fitted rotatably on said center shaft and movable in said axial direction; and said main cylinder having a guide key secured therein, said screw nut riding on said guide key to permit non-rotatable axial movement of said auxiliary cylinder.
Claim 4
Dependent Claim
110 words
The friction braking type vibration snubber according to claim 2 wherein said movable wheel comprises a cylinder opened at one end, and has on its other end an annular friction surface facing said friction braking surface, said open end having on the outer periphery of the open end part a spring-receiving ring, said flywheel being concentrically positioned within said movable wheel and having in the inner end part opposite the outer periphery of said open end of said cylinder a spring-receiving flange; and said means for pressing comprises a push spring inserted between said spring-receiving flange and said spring-receiving ring whereby said movable wheel is always pressed toward said flywheel.
Claim 5
Dependent Claim
46 words
The friction braking type vibration snubber according to claim 2 or 3 further comprising a spacing collar between said flywheel and said bearing means and a nut screwed to the borne end of said center shaft so that the position of said center shaft is adjustable.
Claim 6
Dependent Claim
24 words
The friction braking type vibration snubber according to claim 4 further comprising means for adjustably moving said friction braking surface in the axial direction.
Claim 7
Dependent Claim
24 words
The friction braking type vibration snubber according to claim 2 further comprising means for adjustably moving said friction braking surface in the axial direction.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |