US3815822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive-applying apparatus
Assignee: Mpac Group PLC
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Filing: 1972-11-20
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Granted: 1974-06-11
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Expires: 1992-11-20
Abstract
Abstract A flowable adhesive is applied to a carton blank or paper web by an application nozzle, having a discharge orifice, which is permanently open to ambient pressure. The nozzle is divided into two compartments which are interconnected adjacent to the orifice. One compartment is connected to an adhesive container by a feed conduit and the other is connected to the container by a return conduit. Adhesive is continuously fed by a pump, at a predetermined pressure higher than ambient pressure from the container to the nozzle and returned to the container by a separate suction pump, so that no adhesive is ejected through the orifice. In order that adhesive may be ejected the pressue in the feed conduit is increased, at the required times by means of a piston which displaces adhesive from a cylinder which is in communication with the feed conduit. In a modified form the nozzle comprises coaxial inner and outer tubes the inner tube being adjustable axially relative to the outer tube. By suitably adjusting the two pumps and the difference in level between the ends of the tubes, adhesive may either be caused to flow continuously from the nozzle or intermittently, by increasing the pressure in the feed conduit.
Inventors
- 👤 R Davies
- 👤 L Thornton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:49
CPC Classifications
B; B05; B05C; B05C11/00; B05C11/10; B05C11/1047; A; A24; A24C; A24C5/00; A24C5/14; A24C5/24; B05C5/00; B05C5/02
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
122 words
Apparatus for applying a liquid, for example an adhesive or the like, to a surface, comprising a container for the liquid, at least one applicator nozzle, feed and return conduits for conveying liquid from the container to the nozzle and from the nozzle to the container respectively, and means for circulating liquid continuously from the container through said conduits, said circulating means comprising a first pump for feeding the liquid continuously at a predetermined pressure above ambient pressure along said feed conduit and a second pump for applying suction continuously to said return conduit at that end which is remote from said nozzle, in which said nozzle has a discharge orifice which is in constant communication with said conduits and is unclosable.
Claim 2
Dependent Claim
122 words
Apparatus for applying a liquid, for example an adhesive or the like, to a surface, comprising a container for the liquid, at least one applicator nozzle, feed and return conduits for conveying liquid from the container to the nozzle and from the nozzle to the container respectively, and means for circulating liquid continuously from the container through said conduits, said circulating means comprising a first pump for feeding the liquid continuously at a predetermined pressure above ambient pressure along said feed conduit and a second pump for applying suction continuously to said return conduit at that end which is remote from said nozzle, in which said nozzle has a discharge orifice which is in constant communication with said conduits and is unclosable.
Claim 3
Dependent Claim
37 words
Apparatus as claimed in claim 1 in which said nozzle includes separate feed and return passages connected to the feed and return conduits respectively, said passages being interconnected immediately adjacent to the inner end of the orifice.
Claim 4
Dependent Claim
31 words
Apparatus as claimed in claim 1 in which means is provided for varying the pressure of circulating liquid at said nozzle between substantially ambient pressure and a pressure higher than ambient.
Claim 5
Dependent Claim
60 words
Apparatus as claimed in claim 3, in which said pressure varying means comprises a reservoir, through which the liquid passes, positioned in said feed conduit and activating means operable to reduce the volume of said reservoir to displace at least some of the liquid from said reservoir into said feed conduit and thereby increase the pressure of the circulating liquid.
Claim 6
Dependent Claim
26 words
Apparatus as claimed in claim 4 in which said container is mounted at a lower level than that of the nozzle and the pressure varying means.
Claim 7
Dependent Claim
96 words
Apparatus as claimed in claim 4 in which said container is mounted at a higher level than that of the nozzle and the pressure varying means, a closed secondary container being mounted at a lower level than any other part of the apparatus, said feed and return conduits each being connected separately to said secondary container by a branch conduit, the branch conduit connecting said feed conduit with said secondary container being provided with a control valve operable to enable liquid to flow into said secondary container, under gravity, or to prevent such flow of liquid.
Claim 8
Dependent Claim
51 words
Apparatus as claimed in claim 6 in which said secondary container is provided with a vent pipe having a control valve, said valve being operable to open said secondary container to ambient pressure to enable any liquid in the secondary container to be returned by said second pump to said container.
Claim 9
Dependent Claim
37 words
Apparatus as claimed in claim 7 further comprising link means for movably supporting said nozzle and operating means for moving said nozzle between an idle position and an operating position at which a liquid application is made.
Claim 10
Dependent Claim
19 words
Apparatus as claimed in claim 8 in which said link means is in the form of a parallelogram linkage.
Claim 11
Dependent Claim
56 words
Apparatus as claimed in claim 9 in which said parallelogram linkage comprises a movable plate on which said nozzle is fixed, at least one fixed mounting member and a pair of swing arms each of which is pivotally connected at one end to the movable plate and at the other end to said fixed mounting member.
Claim 12
Dependent Claim
58 words
Apparatus as claimed in claim 10 in which a further arm is pivotally connected at one end to one of said pair of swing arms and said operating means comprises a cam and a cam follower mounted on said further arm, said cam being adapted to cause the nozzle to move towards and away from said operating position.
Claim 13
Dependent Claim
16 words
Apparatus as claimed in claim 11 in which said feed and return conduits comprise flexible tubes.
Claim 14
Dependent Claim
93 words
Apparatus as claimed in claim 12 in which a series of feed ducts and a series of return ducts are provided in said fixed mOunted member, one of said pair of swing arms, and said movable plate, each of the flexible tubes being connected, at its end remote from said container, to one of said series of ducts, said ducts being so arranged that liquid flows along said series of feed ducts to said feed passage in said nozzle, and from said return passage in said nozzle along said series of return ducts.
Claim 15
Dependent Claim
91 words
Apparatus as claimed in claim 13 in which said reservoir comprises a cylindrical chamber in communication with the feed duct in said movable plate, and said activating means comprises a piston movable within said chamber by a pusher member carried on one of said pair of swing arms, operation of said pusher member being in synchronism with movement of said nozzle by the operation means so that liquid is displaced from said chamber into said feed duct each time said operating means causes said nozzle to move to said operating position.
Claim 16
Dependent Claim
50 words
Apparatus as claimed in claim 14 in which the feed and return ducts, where they pass through the pivotal connection at each end of said one of said pair of swing arms, are arranged so that said pivotal connections are lubricated by the liquid as it flows along the ducts.
Claim 17
Dependent Claim
104 words
Apparatus as claimed in claim 15 in which said nozzle comprises a box-like member having an orifice in the form of a straight slot formed in one face thereof and a partition inside said member to form first and second compartments therein, one edge of said partition being directly opposite said orifice and spaced from the inner surface of said one face of said member, said first compartment is connected to said feed conduit, said second compartment being connected to said return conduit, and said one edge of said partition forming a weir over which liquid flows from said first to said second compartment.
Claim 18
Dependent Claim
108 words
Apparatus as claimed in claim 15 in which said nozzle comprises an inner and outer tube, said outer tube being positioned round and coaxial with said inner tube, the cross-sectional demensions of the tubes being such that a space is formed within said outer tube and surrounding said inner tube, one end of said inner tube being connected to said feed conduit, the corresponding end of said outer tube being connected to said return conduit, and the end of the wall of the inner tube, remote from said one end, forming a weir over which liquid flows from said inner tube into said space surrounding said inner tube.
Claim 19
Dependent Claim
48 words
Apparatus as claimed in claim 17 wherein the remote end of said outer tube projects beyond the corresponding end of the inner tube so that liquid does not flow beyond the end of the outer tube except when the liquid pressure at said nozzle is higher than ambient.
Claim 20
Dependent Claim
19 words
Apparatus as claimed in claim 17 in which said inner tube is axially adjustable relative to said outer tube.
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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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |