Patent US4403518A successfully refreshed from Google Patents.
US4403518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sampler apparatus
Assignee: Welker Engineering Co
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Filing: 1981-04-06
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Granted: 1983-09-13
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Expires: 2001-04-06
Abstract
Abstract An improved sampler is enclosed. In the preferred and illustrated embodiment, the sampler comprises a compressable sample collection head formed of a resilient material having a dished area therein which head is pushed by a push rod against a mating or facing surface of harder material. The collection head is encased in a shield. The improved apparatus includes a projecting mounting post extending into the collection head and which is bonded thereto, further including an undercut portion having an enlarged overhanging shoulder to secure the collection head. This prevents separation of the collection head from the push rod.
Inventors
- 👤 Robert H. Welker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:39
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
In a sampler having a resilient cylindrical plug, a shield surrounding said plug and defining an end exposed face of the plug having an indention formed therein and which end exposed face is opposite a cooperative facing plate, and wherein the indention of the exposed face is subjected to contraction in response to movement of a push rod relatively moving said plug towards said facing plate to seal there against and capture a fluid in the indention thereof, the apparatus further including a rigid pump support body, a rigid restraining washer being positioned in contact with said rigid pump support body and forming an aperture, said resilient cylindrical plug being in intimate contact with said restraining washer, a projecting mounting post secured to said rigid pump body and extending through said aperture of said washer and into said plug from an end thereof opposite said indention wherein said mounting post includes an undercut portion with an enlarged overhang shoulder and wherein said shield overhangs the exposed face of said plug and cooperates with said mounting post to hold said plug within said shield.
Claim 2
Dependent Claim
183 words
In a sampler having a resilient cylindrical plug, a shield surrounding said plug and defining an end exposed face of the plug having an indention formed therein and which end exposed face is opposite a cooperative facing plate, and wherein the indention of the exposed face is subjected to contraction in response to movement of a push rod relatively moving said plug towards said facing plate to seal there against and capture a fluid in the indention thereof, the apparatus further including a rigid pump support body, a rigid restraining washer being positioned in contact with said rigid pump support body and forming an aperture, said resilient cylindrical plug being in intimate contact with said restraining washer, a projecting mounting post secured to said rigid pump body and extending through said aperture of said washer and into said plug from an end thereof opposite said indention wherein said mounting post includes an undercut portion with an enlarged overhang shoulder and wherein said shield overhangs the exposed face of said plug and cooperates with said mounting post to hold said plug within said shield.
Claim 3
Dependent Claim
26 words
The apparatus of claim 1 wherein said post is concentric, circular in shape, and has a fully encircling and overhanging shoulder adjacent to the undercut portion.
Claim 4
Dependent Claim
21 words
The apparatus of claim 1 or 2 wherein said mounting post is connected to the end portion of said push rod.
Claim 5
Dependent Claim
18 words
The apparatus of claim 1 wherein said mounting post is within said resilient plug which is cast thereabout.
Claim 6
Dependent Claim
19 words
The apparatus of claim 4 wherein said pump support body is hollow and has a flow tube positioned therein.
Claim 7
Dependent Claim
24 words
The apparatus of claim 4 wherein said pump support body is hollow and is internally threaded axial passage therein to receive a mounting bolt.
Claim 8
Dependent Claim
23 words
the apparatus of claim 1 wherein said shield is slidably positioned for movement axially in a specified range of movement along said plug.
Claim 9
Dependent Claim
34 words
The apparatus of claim 1 wherein said plug is attached to said rigid restraining washer so that plug retention is cooperatively maintained by said projecting mounting post, said shield and said rigid restraining washer.
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) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |