Patent US3661679A successfully refreshed from Google Patents.
US3661679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive applicator for plywood patching machine
Assignee: Lockwood Technical Inc
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Filing: 1970-09-08
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Granted: 1972-05-09
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Expires: 1990-09-08
Abstract
Abstract A conventional plywood patching machine is modified to permit accurately controlled application of adhesive directly to the interface between patch and ply. Nozzle applicators are built into the hold-down ring of a patching machine in a manner that requires minimum modification of other parts of the machine. A particularly effective nozzle and valve structure is described, responsive to pressure pulses and effectively compensating pressure and viscosity variations. A pulsed air jet spreads the adhesive. A release agent is applied via an airstream to prevent buildup of adhesive on the mechanism.
Inventors
- 👤 Raymond Thomas Law
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:56
CPC Classifications
B; B27; B27G; B27G1/00; B27G11/00; B27G11/005; Y; Y10; Y10T; Y10T156/00; Y10T156/12; Y10T156/1304; Y10T156/1348; Y10T156/1352; Y10T156/1374; Y10T156/17; Y10T156/1702; Y10T156/1712; Y10T156/1722; Y10T156/1724; Y10T156/1798
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 words
The combination defined in claim 1, and in which said hold-down ring has a bore on an axis that is in a generally radial plane and is oblique with respect to the axis of the ring, and said nozzle assembly is mounted on an outer peripheral portion of the ring adjacent the bore and includes a nozzle tip portion extending into the bore with said nozzle orifice at the end of the tip portion.
Claim 2
Dependent Claim
134 words
The combination defined in claim 1, and in which said nozzle assembly includes structure forming a nozzle chamber communicating with the nozzle orifice, and a coaxial piston chamber rearward of the nozzle chamber and communicating with said conduit means, a piston member including a piston in the piston chamber and a coaxial plunger projecting forward into the nozzle chamber, the piston member being axially slidable between a normal rearward position and a forward position, and adhesive metering mechanism for supplying adhesive from said conduit means to the nozzle chamber forward of the plunger, said adhesive ejecting means including means for applying to said conduit means pressure pulses in timed relation to the operation of the machine to drive the piston member forward and thereby expel adhesive from the nozzle chamber through the nozzle orifice.
Claim 3
Dependent Claim
63 words
The combination defined in claim 3, and in which said metering mechanism includes passage structure communicating between said conduit means and said nozzle chamber, and a normally closed valve connected in series with said passage structure and including means acting to open the valve after the start and to close the valve before the end of said forward movement of said piston member.
Claim 4
Dependent Claim
33 words
The combination defined in claim 4, and in which said metering mechanism includes also a manually adjustable flow limiting valve connected in series with said passage structure and with said normally closed valve.
Claim 5
Dependent Claim
51 words
The combination defined in claim 1, and including structure forming a second nozzle orifice closely adjacent the first said nozzle orifice and directed obliquely toward the axis thereof, and means for ejecting air from the second nozzle orifice in timed relation to said adhesive ejection from the first said nozzle orifice.
Claim 6
Dependent Claim
25 words
The combination defined in claim 6, and including means for dispersing into said air prior to its said ejection a finely divided liquid releasing agent.
Claim 7
Dependent Claim
15 words
The combination defined in claim 7, and in which said releasing agent is silicone oil.
Claim 8
Dependent Claim
44 words
The combination defined in claim 1, and including structure forming at least one orifice opening through the aperture wall of said hold-down ring in a generally radial direction, and means for ejecting through the last said orifice air containing a finely divided releasing agent.
Claim 9
Dependent Claim
15 words
The combination defined in claim 9, and in which said releasing agent is silicone oil.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |