US4639155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt dispensers
Assignee: Emhart Industries Inc
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Filing: 1984-12-18
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Granted: 1987-01-27
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Expires: 2004-12-18
Abstract
Abstract A device for use in a hand held hot melt gun to prevent drool of melted composition from the outlet thereof when the gun is not in use is described and claimed. In one embodiment of the invention the device comprises a melt body 10 having a melt chamber 12, resilient means provided by a coil spring 26 and means 36 for heating the melt body. When in use a rod of composition urged by a feeding force in a direction towards the melt body 10 is melted in the melt chamber 12 and is dispensed in molten condition from the outlet 20. When the feeding force is released after use the spring exerts sufficient force in a reverse direction to the direction of the feeding force to move the rod outwardly of the melt body, which relieves the pressure within the melt body and thereby substantially prevents further composition from drooling from the outlet.
Inventors
- 👤 Heinz Schuster
- 👤 Gerd Press
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:53
CPC Classifications
B; B05; B05C; B05C17/00; B05C17/005; B05C17/00523; B05C17/00546
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
133 words
In a device for melting and dispensing thermoplastic material supplied in the form of a rod, said device comprising means for application of a feeding force on the rod to urge it in a direction towards a melt body and a melt body having an inlet adapted to receive a rod of thermoplastic material, an outlet, a passage extending between the inlet and outlet, and means for heating the melt body so that material which enters the passage via the inlet in the form of a rod may be dispersed from the outlet in a molten condition; wherein the improvement comprises resilient means located within the passage and arranged to exert sufficient force in a reverse direction to move the rod outwardly of the melt body when the feeding force is not applied.
Claim 2
Dependent Claim
133 words
In a device for melting and dispensing thermoplastic material supplied in the form of a rod, said device comprising means for application of a feeding force on the rod to urge it in a direction towards a melt body and a melt body having an inlet adapted to receive a rod of thermoplastic material, an outlet, a passage extending between the inlet and outlet, and means for heating the melt body so that material which enters the passage via the inlet in the form of a rod may be dispersed from the outlet in a molten condition; wherein the improvement comprises resilient means located within the passage and arranged to exert sufficient force in a reverse direction to move the rod outwardly of the melt body when the feeding force is not applied.
Claim 3
Dependent Claim
14 words
A device according to claim 1 wherein the resilient means comprises a coil spring.
Claim 4
Dependent Claim
28 words
A device according to claim 2 wherein said coil spring is in heat conductive contact with the melt body whereby it contributes to melting of the thermoplastic material.
Claim 5
Dependent Claim
12 words
A device according to claim 1 wherein said outlet comprises an orifice.
Claim 6
Dependent Claim
25 words
A device according to claim 1 wherein said resilient means is arranged to engage the solid portion of a rod fed into the melt chamber.
Claim 7
Dependent Claim
36 words
A device according to claim 2 wherein the device further comprises an inlet sleeve for guiding a rod to the inlet of the melt body, the sleeve having lip means for gripping engagement with the rod.
Claim 8
Dependent Claim
25 words
A device according to claim 6 wherein the diameter of the coil spring is larger than that of an opening described by the lip means.
Claim 9
Dependent Claim
57 words
A device according to claim 1 wherein a melt chamber is provided by a melt chamber element which is movable with the passage in the melt body and the resilient means is arranged to engage the melt chamber element to move it in a direction outwardly of the melt body when the feeding force is not applied.
Claim 10
Dependent Claim
32 words
A device according to claim 8 wherein the passage in the melt body is provided with a stop means whereby movement of the melt chamber element towards the inlet end is limited.
Claim 11
Dependent Claim
13 words
A device according to claim 8 wherein said outlet comprises a nozzle assembly.
Claim 12
Dependent Claim
25 words
A device according to claim 10 wherein the resilient means is located within the passage between the outlet nozzle assembly and the melt chamber element.
Claim 13
Dependent Claim
19 words
A hot melt hand held glue gun which comprises a device according to claim 1, 2, 5 or 6.
Claim 14
Dependent Claim
18 words
A hot melt hand held glue gun which comprises a device according to claim 1, 8 or 9.
Claim 15
Dependent Claim
19 words
A device according to claim 8 further comprising trigger operated means for feeding the rod into the melt chamber.
Claim 16
Dependent Claim
36 words
A device according to claim 10 wherein said nozzle assembly is releasably mounted and that the melt chamber element may be removed from the melt body when the nozzle assembly is released from the melt body.
Claim 17
Dependent Claim
13 words
A device according to claim 4 wherein said outlet comprises a nozzle assembly.
References Cited (Backward Citations)
US3743142A
Cited
GB1582488A
Cited
US4032046A
Cited
GB2033018A
Cited
US4378076A
Cited
EP0030893A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |