US3786503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth movement indicator
Assignee: Individual
•
Filing: 1972-11-17
•
Granted: 1974-01-15
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Expires: 1992-11-17
Abstract
Abstract An explosion-proof subsidence-indicator for mines, tunnels and earthworks including a non-conductive body including a batteryactuated warning-light encased in a sealed chamber, and a springloaded probe extending outward from the chamber to engage the mine roof.
Inventors
- 👤 E Webb
- 👤 L Kopelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:13
CPC Classifications
E; E21; E21F; E21F17/00; E21F17/18; E21F17/185
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
144 words
An earth-movement indicator comprising an a. elongated post having b. a probe section and c. a mount section, one of said probe section and said mount section being telescopically received within the other section, d. means for locking said probe section and said mount section in selected telescopic positions, said probe section including e. a wall section adopted to transmit light therethrough and f. an end wall, said end wall having g. an aperture therein, h. a source of light enclosed in said probe section adjacent said light-transmitting wall section, said light source including i. switch means, j. a probe arm associated with said switch means, said probe arm being extended through said aperture in the end wall, k. bias means for biasing said probe arm outwardly of said Probe section, and l. sealing means for sealing between said probe arm and said endwall.
Claim 2
Dependent Claim
144 words
An earth-movement indicator comprising an a. elongated post having b. a probe section and c. a mount section, one of said probe section and said mount section being telescopically received within the other section, d. means for locking said probe section and said mount section in selected telescopic positions, said probe section including e. a wall section adopted to transmit light therethrough and f. an end wall, said end wall having g. an aperture therein, h. a source of light enclosed in said probe section adjacent said light-transmitting wall section, said light source including i. switch means, j. a probe arm associated with said switch means, said probe arm being extended through said aperture in the end wall, k. bias means for biasing said probe arm outwardly of said Probe section, and l. sealing means for sealing between said probe arm and said endwall.
Claim 3
Dependent Claim
20 words
An indicator according to claim 1 in which said probe section and said mount section are formed of non-conducting material.
Claim 4
Dependent Claim
16 words
An indicator according to claim 2 in which said probe section is formed of transparent plastic.
Claim 5
Dependent Claim
53 words
An indicator according to claim 3 in which said enclosed light source includes a battery source and a light bulb, said light bulb being mounted in a reflector assembly, and said reflector assembly being mounted for reciprocation with said probe arm, whereby the reflector and bulb comprise a portion of said switch means.
Claim 6
Dependent Claim
18 words
An indicator according to claim 4 including guide means for guiding said probe arm within said probe section.
Claim 7
Dependent Claim
19 words
An indicator according to claim 5 in which said probe arm includes a shoulder positioned to engage said endwall.
Claim 8
Dependent Claim
36 words
An indicator according to claim 6 in which the probe section has a cylindrical inner wall, said reflector is conical, and said guide means includes a transparent conical section on said probe arm adjacent said reflector.
Claim 9
Dependent Claim
17 words
An indicator according to claim 7 in which said reflector is secured on said transparent conical section.
Claim 10
Dependent Claim
20 words
An indicator according to claim 8 in which said reflector is mounted within a lip on said transparent conical section.
Claim 11
Dependent Claim
64 words
An indicator according to claim 9 in which said probe section includes a removeable cap at its end remote from the probe arm, said removeable cap being adapted to support a battery assembly within said probe section, said battery assembly including a sleeve longitudinal contact means extended along said sleeve for providing contact between one end of said battery assembly and said reflector assembly.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |