US3713059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solenoid operated plunger device
Assignee: Hosiden Electronics Co Ltd
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Filing: 1971-12-01
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Granted: 1973-01-23
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Expires: 1991-12-01
Abstract
Abstract A solenoid operated plunger device is provided of the type in which a plunger is arranged to be forced by magnetic attraction into a coil upon energization thereof. Movably interposed between the plunger and a socket therefor is an auxiliary magnetic body. A guide rod of magnetic material attached to one end of the auxiliary magnetic body extends through the socket to the exterior thereof, and a spring engages the externally projecting part, the spring urging the auxiliary magnetic body against the socket. Upon energization of the coil, the auxiliary magnetic body against the socket. Upon energization of the coil, the auxiliary magnetic body is initially driven toward the plunger, and when it abuts against the plunger, both are integrally driven to the socket. The socket and the auxiliary magnetic body have concave and convex surfaces, respectively, which can fit each other, thereby increasing the area of contact therebetween.
Inventors
- 👤 K Tada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:53
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/13
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
250 words
A solenoid operated plunger device comprising a solenoid coil, a movable plunger disposed within the coil and projecting from one end thereof, a socket disposed at a fixed position within the other end of the coil, a magnetic yoke extending outside the coil and providing a magnetic interconnection between the plunger and the socket, an auxiliary magnetic body spaced from said plunger and interposed between the plunger and the socket so as to be movable therebetween, a guide rod attached to one end of said auxiliary magnetic body, said guide rod extending through the socket centrally and projecting externally of the magnetic yoke, and a coiled spring disposed on the externally projecting part of the guide rod and urging the guide rod toward the exterior of said yoke, to hold said auxiliary magnetic body in contact with said socket when said coil is not energized, the resilience of said coiled spring being chosen such that, when said coil is energized, the force of attraction urging said auxiliary magnetic body toward said plunger is slightly greater than the oppositely directed force applied to said auxiliary magnetic body by the coiled spring whereby said auxiliary magnetic body initially moves away from said socket toward said plunger to produce an air gap between said auxiliary magnetic body and said socket whereafter said plunger and auxiliary magnetic body, upon coming into contact with one another, move as a uNit toward said socket to eliminate the air gap between said auxiliary magnetic body and socket.
Claim 2
Dependent Claim
250 words
A solenoid operated plunger device comprising a solenoid coil, a movable plunger disposed within the coil and projecting from one end thereof, a socket disposed at a fixed position within the other end of the coil, a magnetic yoke extending outside the coil and providing a magnetic interconnection between the plunger and the socket, an auxiliary magnetic body spaced from said plunger and interposed between the plunger and the socket so as to be movable therebetween, a guide rod attached to one end of said auxiliary magnetic body, said guide rod extending through the socket centrally and projecting externally of the magnetic yoke, and a coiled spring disposed on the externally projecting part of the guide rod and urging the guide rod toward the exterior of said yoke, to hold said auxiliary magnetic body in contact with said socket when said coil is not energized, the resilience of said coiled spring being chosen such that, when said coil is energized, the force of attraction urging said auxiliary magnetic body toward said plunger is slightly greater than the oppositely directed force applied to said auxiliary magnetic body by the coiled spring whereby said auxiliary magnetic body initially moves away from said socket toward said plunger to produce an air gap between said auxiliary magnetic body and said socket whereafter said plunger and auxiliary magnetic body, upon coming into contact with one another, move as a uNit toward said socket to eliminate the air gap between said auxiliary magnetic body and socket.
Claim 3
Dependent Claim
53 words
A solenoid operated plunger device according to claim 1, in which said guide rod comprises a magnetic material, the material and thickness of said guide rod being chosen such that it is saturated magnetically by the flux emanating from the energized coil when said auxiliary magnetic body is in contact with the plunger.
Claim 4
Dependent Claim
21 words
The device of claim 1 wherein said socket and said auxiliary magnetic body have interfitting concave and convex opposing surfaces respectively.
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |