US3758001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruder
Assignee: Cities Service Co
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Filing: 1971-10-29
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Granted: 1973-09-11
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Expires: 1991-10-29
Abstract
Abstract A polymer extruder having heating means which is thermostatically controlled for regulated heating of the extruder barrel and, hence, the material being extruded. In preferred embodiments the extruder barrel is fitted with two longitudinally spaced-apart electric heating elements, each of which is independently controlled with separate thermostats attached to the barrel in the vicinity of the element which it controls. The first heating element is located near the feed inlet of the extruder, and the second near the extrusion orifice. The first element provides high heat input for rapid softening of the polymeric feed. The other element provides additional heat input for extrusion of the polymeric material at a constant, preselected temperature. The invention is especially applicable to hand-held extruders which are operated intermittently for extruding hot tapes during the weather sealing of structural joints.
Inventors
- 👤 J Callan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:32
CPC Classifications
B; B29; B29B; B29B13/00; B29B13/02; B29B13/022; B29C; B29C48/00; B29C48/25; B29C48/78; B29C48/80; B29C48/83; B29C48/832; B29C48/875; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92209; B29C2948/92504; B29C2948/92704; B29C2948/92819; B29C2948/92857; B29C2948/92876; B29C2948/92895; B29C48/03; B29L; B29L2031/00; B29L2031/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
420 words
A hand-held extruder gun for extrusion and application of an elastomeric sealant composition to a structural joint which comprises: a. an elongated cylindrical extruder barrel having a fed end and a discharge end, an inlet at the fed end for a strand of elastomeric sealant composition that is to be heated and extruded, and an extrusion orifice at the discharge end for extruding and applying the fed elastomeric sealant composition as a heated sealant tape, b. a rotatable extruding screw axially mounted within said barrel, said screw being connected toward the fed end of the barrel to a drive means powered with an electric motor to which the supply of electric power can be turned on and off, and whereupon rotation of said screw by the drive means said strand of sealant composition is pulled through said inlet into the barrel and conveyed through the barrel by the rotating action of the screw, c. a first electric heating element contiguous with said barrel toward the fed end thereof, flow of electric power to said first element being regulated by a first normally closed thermostatic switch attached to said barrel and which senses and reacts to the temperature of the fed end of the barrel, said first element being wired to receive electric power only when power is supplied to the electric motor of the drive means and also when said first thermostatic switch is closed, d. a second electric heating element contiguous with said barrel toward the dischArge end thereof, flow of electric power to said first element being regulated by a second normally closed thermostatic switch attached to said barrel and which senses and reacts to the temperature of the discharge end of the barrel, said first electric element being adapted to supply heat to said barrel at a faster rate than said second electric element, and whereupon supplying power to said electric motor said sealant composition that is drawn into the barrel is rapidly heated and softened in the fed end of the barrel by heating of the first electric element and is heated in the discharge end of the barrel by heating of the second electric element, supply of electric power to said first element being interrupted upon turning off electric power to said drive motor or upon opening of the first thermostatic switch, and supply of electric power to said second element being interrupted by opening of the second thermostatic switch, and further comprising e. means for holding, operating and manipulating the extruder gun by hand.
Claim 2
Dependent Claim
420 words
A hand-held extruder gun for extrusion and application of an elastomeric sealant composition to a structural joint which comprises: a. an elongated cylindrical extruder barrel having a fed end and a discharge end, an inlet at the fed end for a strand of elastomeric sealant composition that is to be heated and extruded, and an extrusion orifice at the discharge end for extruding and applying the fed elastomeric sealant composition as a heated sealant tape, b. a rotatable extruding screw axially mounted within said barrel, said screw being connected toward the fed end of the barrel to a drive means powered with an electric motor to which the supply of electric power can be turned on and off, and whereupon rotation of said screw by the drive means said strand of sealant composition is pulled through said inlet into the barrel and conveyed through the barrel by the rotating action of the screw, c. a first electric heating element contiguous with said barrel toward the fed end thereof, flow of electric power to said first element being regulated by a first normally closed thermostatic switch attached to said barrel and which senses and reacts to the temperature of the fed end of the barrel, said first element being wired to receive electric power only when power is supplied to the electric motor of the drive means and also when said first thermostatic switch is closed, d. a second electric heating element contiguous with said barrel toward the dischArge end thereof, flow of electric power to said first element being regulated by a second normally closed thermostatic switch attached to said barrel and which senses and reacts to the temperature of the discharge end of the barrel, said first electric element being adapted to supply heat to said barrel at a faster rate than said second electric element, and whereupon supplying power to said electric motor said sealant composition that is drawn into the barrel is rapidly heated and softened in the fed end of the barrel by heating of the first electric element and is heated in the discharge end of the barrel by heating of the second electric element, supply of electric power to said first element being interrupted upon turning off electric power to said drive motor or upon opening of the first thermostatic switch, and supply of electric power to said second element being interrupted by opening of the second thermostatic switch, and further comprising e. means for holding, operating and manipulating the extruder gun by hand.
Claim 3
Dependent Claim
120 words
A process for producing a hot sealant tape which comprises feeding an elastomeric sealant composition into the first section of a heating zone and then passing said sealant composition into a second interconnecting section of said zone, the input of heat into the first and second sections of the heating zone being regulated independently, heat being supplied to said first section only during transit of said sealant composition through the first section and at which time heat is supplied to said first section at a higher rate than it is supplied to the second section, and extruding the elastomeric sealant composition as a heated sealant tape subsequent to discharge of said composition from the second section of the heating zone.
Claim 4
Dependent Claim
120 words
A process for producing a hot sealant tape which comprises feeding an elastomeric sealant composition into the first section of a heating zone and then passing said sealant composition into a second interconnecting section of said zone, the input of heat into the first and second sections of the heating zone being regulated independently, heat being supplied to said first section only during transit of said sealant composition through the first section and at which time heat is supplied to said first section at a higher rate than it is supplied to the second section, and extruding the elastomeric sealant composition as a heated sealant tape subsequent to discharge of said composition from the second section of the heating zone.
Claim 5
Dependent Claim
57 words
A process as defined in claim 2 wherein the heat input to the first section of the heating zone is regulated in response to the temperature detected at the inlet of said first section and the heat input to said second section is regulated in response to the temperature detected at the outlet of the second section.
Claim 6
Dependent Claim
40 words
A process as defined in claim 2 wherein the temperature to which the elastomeric sealant composition is heated in the second section of the heating zone is higher than that to which it is heated in the first section thereof.
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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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |