US3653552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive applicator
Assignee: International Standard Electric Corp
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Filing: 1969-10-22
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Granted: 1972-04-04
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Expires: 1989-10-22
Abstract
Abstract A device for dispensing liquid resinous material from solid rods includes a heated melting tube having a dispensing jet with a valve at one end, and a tapered insert at the other end made of a material to which the resinous material will not adhere. The drive feeding the rod into the insert is disengaged when the valve is closed and reengaged when the valve is opened. The arrangement prevents pressure build up when the device is stopped and limits back flow of molten material along the rod.
Inventors
- 👤 Bernard Edwin Ash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:11
CPC Classifications
B; B29; B29B; B29B13/00; B29B13/02; B29B13/022; B05; B05C; B05C17/00; B05C17/005; B05C17/00523; B05C17/00526; B05C17/0053; B05C5/00; B05C5/02; B05C5/0225; B05C7/00; B05C7/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
283 words
An apparatus for dispensing resinous material in liquid form when the resinous material is supplied in the form of a continuous rod, comprising a melting tube having a passageway for said rod, a dispensing jet attached to one end of said tube, a valve controlling liquid flow through said jet, a sleeve insert having substantially the full length enclosed within the other end of the tube, said sleeve having an outer end portion of said passageway with substantially the same internal diameter as the external diameter of the rod and an inner Portion with a tapered internal section enclosed within said tube, the taper increasing in section towards the jet end of the melting tube, the sleeve insert being made of a material relatively non-adherent to the resinous material at temperatures cooler than at said jet end, means for feeding the rod into the melting tube at the sleeve insert end, said means being disengaged from the rod when the valve is closed and reengaged when the valve is opened, an electrical heater extending over the melting tube except the portion containing the sleeve insert, said passageway within the electrical heater portion of said tube having a larger internal diameter than that of said sleeve outer end portion to accommodate the melted rod material, said passageway having a constant internal diameter within said heater and tapering to a narrow diameter adjacent said jet end, the heater maintaining the jet end of the melting tube at the dispensing temperature of the resinous material while the portion of the tube adjacent to the sleeve insert is at the melting point of the resinous material, and a heat-conducting mass supporting said tube at the sleeve end.
Claim 2
Independent Claim
283 words
An apparatus for dispensing resinous material in liquid form when the resinous material is supplied in the form of a continuous rod, comprising a melting tube having a passageway for said rod, a dispensing jet attached to one end of said tube, a valve controlling liquid flow through said jet, a sleeve insert having substantially the full length enclosed within the other end of the tube, said sleeve having an outer end portion of said passageway with substantially the same internal diameter as the external diameter of the rod and an inner Portion with a tapered internal section enclosed within said tube, the taper increasing in section towards the jet end of the melting tube, the sleeve insert being made of a material relatively non-adherent to the resinous material at temperatures cooler than at said jet end, means for feeding the rod into the melting tube at the sleeve insert end, said means being disengaged from the rod when the valve is closed and reengaged when the valve is opened, an electrical heater extending over the melting tube except the portion containing the sleeve insert, said passageway within the electrical heater portion of said tube having a larger internal diameter than that of said sleeve outer end portion to accommodate the melted rod material, said passageway having a constant internal diameter within said heater and tapering to a narrow diameter adjacent said jet end, the heater maintaining the jet end of the melting tube at the dispensing temperature of the resinous material while the portion of the tube adjacent to the sleeve insert is at the melting point of the resinous material, and a heat-conducting mass supporting said tube at the sleeve end.
Claim 3
Dependent Claim
13 words
Apparatus as claimed in claim 1 wherein the resinous material is an adhesive.
Claim 4
Dependent Claim
14 words
Apparatus as claimed in claim 1 wherein the sleeve insert is made of polytetrafluoroethylene.
Claim 5
Dependent Claim
48 words
Apparatus as claimed in claim 1 wherein the means feeding the rod into the melting tube comprises a pair of friction-drive wheels and including means for automatically disengaging said drive wheels from said rod when said valve is closed and reengaging said wheels when said valve is opened.
Claim 6
Dependent Claim
50 words
Apparatus as claimed in claim 1 wherein the internal diameter of said melting tube is enlarged in the section extending around said sleeve insert to provide a temperature gradient over said tapered sleeve, the external diameter of said tube being constant along said sleeve insert portion and said heater portion.
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |