Patent US3720533A successfully refreshed from Google Patents.
US3720533A
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US
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Method for applying a thermoplastic locking patch on a threaded fastener
Assignee: SPS Technologies LLC
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Filing: 1971-01-12
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Granted: 1973-03-13
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Expires: 1991-01-12
Abstract
Abstract A finely powdered thermoplastic material is placed in a fluidizing chamber and is dispensed on a preheated threaded fastener element in controlled amounts by controlled air pulsations which pass through a venturi tube arrangement. The powdered material is deposited on the threaded surface in a predetermined amount and is fused thereto to provide a locking patch of solidified thermoplastic material.
Inventors
- 👤 J Gallagher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:53
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/18; B05D1/22; B05D1/24; F; F16; F16B; F16B33/00; F16B33/06; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/947
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A process for applying a locking patch of thermoplastic material to the thread surface of threaded fastener elements comprising: heating said threaded fastener elements and transporting said heated fastener elements to a thermoplastic application station; fluidizing finely powdered thermoplastic material; pulsating a carrier fluid so that discrete pulses of said fluid are formed and entraining a predetermined quantity of said fluidized thermoplastic material in each of said pulses; directing said pulses to said thermoplastic application station in intervals such that each pulse impinges on the thread surface of one of said heated fastener elements whereby said quantity of thermoplastic material is fusion bonded to said surface.
Claim 2
Dependent Claim
106 words
A process for applying a locking patch of thermoplastic material to the thread surface of threaded fastener elements comprising: heating said threaded fastener elements and transporting said heated fastener elements to a thermoplastic application station; fluidizing finely powdered thermoplastic material; pulsating a carrier fluid so that discrete pulses of said fluid are formed and entraining a predetermined quantity of said fluidized thermoplastic material in each of said pulses; directing said pulses to said thermoplastic application station in intervals such that each pulse impinges on the thread surface of one of said heated fastener elements whereby said quantity of thermoplastic material is fusion bonded to said surface.
Claim 3
Dependent Claim
47 words
The process as defined in claim 1 wherein said carrier fluid is pulsed by drawing said stream of carrier fluid from a pressurized supply through a pulsating fluid valve thereby to accurately meter a predetermined volume of carrier fluid to control the quantity of thermoplastic material entrained.
Claim 4
Dependent Claim
19 words
The process as defined in claim 2 wherein said finely powdered thermoplastic material is fluidized in a fluidizing chamber.
Claim 5
Dependent Claim
92 words
The process as defined in claim 3 wherein said carrier fluid is a gas and said process includes the steps of directing said carrier gas through a venturi nozzle and providing a fluid communication passage from said fluidizing chamber to the throat of said venturi nozzle whereby when said carrier gas is pulsed through said venturi nozzle the pressure drop at said throat creates a partial vacuum which sucks up said predetermined quantity of thermoplastic material into said venturi nozzle thereby entraining said thermoplastic material into the pulsating stream of carrier gas.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |