US3918892A — Apparatus for heating a pipe made of a thermoplas…

Claim 1

Independent Claim 118 words

An apparatus for heating a pipe made of a thermoplastic synthetic resinous material comprising a heating chamber defined between an inner tubular member and an outer tubular member for heating the crystalline thermoplastic resinous pipe moving through the central portion of said inner tubular member, a plurality of partition walls extending through the entire length of said heating chamber to divide the heating chamber into a plurality of chamber portions, and a plurality of temperature measuring elements each element being mounted in one of said plurality of chamber portions and angularly displaced from one another circumferentially whereby each said temperature measuring element can effect control of the temperature in one of the chamber portions independently of one another.

Claim 2

Independent Claim 118 words

An apparatus for heating a pipe made of a thermoplastic synthetic resinous material comprising a heating chamber defined between an inner tubular member and an outer tubular member for heating the crystalline thermoplastic resinous pipe moving through the central portion of said inner tubular member, a plurality of partition walls extending through the entire length of said heating chamber to divide the heating chamber into a plurality of chamber portions, and a plurality of temperature measuring elements each element being mounted in one of said plurality of chamber portions and angularly displaced from one another circumferentially whereby each said temperature measuring element can effect control of the temperature in one of the chamber portions independently of one another.

Claim 3

Dependent Claim 104 words

An apparatus as claimed in claim 1 further comprising at least two pipe guide wheels disposed in an inlet chamber and an outlet chamber respectively of a heating furnAce for introducing the crystalline thermoplastic resinous pipe into the heating furnace and causing the pipe to move back and forth several times in the heating furnace by changing its direction of movement, said guide wheels being forcedly driven to advance the pipe when the pipe moves upwardly from a lower run to an upper run and being driven by the moving pipe when the pipe moves downwardly from an upper run to a lower run.

Claim 4

Dependent Claim 87 words

An apparatus as claimed in claim 2 wherein said guide wheels each comprise a drum and a drive mechanism therefor, said drive mechanism comprising a drive sprocket wheel, a first friction ring adapted to rotate with said sprocket wheel as a unit, a second friction ring adapted to rotate as a unit with the drum and to be brought into frictional engagement with said first friction ring, and means for adjusting the force with which said two friction rings are brought into frictional engagement with each other.

Claim 5

Dependent Claim 38 words

An apparatus as claimed in claim 2 wherein said pipe is elliptic in cross-section, and said guide wheels are each formed therein with a guide surface which is similar in shape to the sectional shape of the pipe.

Claim 6

Dependent Claim 29 words

An apparatus as claimed in claim 3 wherein said frictional force adjusting means comprises a spring, and a clamp ring threaded into the guide wheel for pressing said spring.

Claim 7

Independent Claim 159 words

An apparatus for heating a pipe made of a thermoplastic synthetic resinous material comprising at least two pipe guide wheels disposed in an inlet chamber and an outlet chamber respectively of a heating furnace for introducing the crystalline thermoplastic resinous pipe into the heating furnace and causing the pipe to move back and forth several times in the heating furnace by changing its direction of movement, and drive means connected to at least one of said guide wheels, said guide wheels including adjustable force transmitting friction rings for connecting said guide wheels to said drive means, said drive means and said adjustable force transmitting friction rings being operable to cause said guide wheels to forcedly advance the pipe when the pipe moves upwardly from a lower run to an upper run and to cause said guide wheels to be relatively freely driven by the moving pipe when the pipe moves downwardly from an upper run to a lower run.

Claim 8

Independent Claim 159 words

An apparatus for heating a pipe made of a thermoplastic synthetic resinous material comprising at least two pipe guide wheels disposed in an inlet chamber and an outlet chamber respectively of a heating furnace for introducing the crystalline thermoplastic resinous pipe into the heating furnace and causing the pipe to move back and forth several times in the heating furnace by changing its direction of movement, and drive means connected to at least one of said guide wheels, said guide wheels including adjustable force transmitting friction rings for connecting said guide wheels to said drive means, said drive means and said adjustable force transmitting friction rings being operable to cause said guide wheels to forcedly advance the pipe when the pipe moves upwardly from a lower run to an upper run and to cause said guide wheels to be relatively freely driven by the moving pipe when the pipe moves downwardly from an upper run to a lower run.

Claim 9

Independent Claim 151 words

An apparatus for heating a pipe made of a thermoplastic synthetic resinous material comprising at least two pipe guide wheels disposed in an inlet chamber and an outlet chamber respectively of a heating furnace for introducing the crystalline thermoplastic resinous pipe into the heating furnace and causing the pipe to move back and forth several times in the heating furnace by changing its direction of movement, said pipe being elliptic in cross-section, and said guide wheels including a plurality of guide members for receiving said elliptic pipe and being affixed to the peripheral surface of said guide wheels, said guide members including a curved guide surface of a shape substantially similar to that of the elliptic pipe for supporting said pipe and a pair of projections extending upwardly from opposite sides of the guide surface and having planar surfaces, said projections to prevent dislodging of the pipe from the guide member.

Claim 10

Independent Claim 151 words

An apparatus for heating a pipe made of a thermoplastic synthetic resinous material comprising at least two pipe guide wheels disposed in an inlet chamber and an outlet chamber respectively of a heating furnace for introducing the crystalline thermoplastic resinous pipe into the heating furnace and causing the pipe to move back and forth several times in the heating furnace by changing its direction of movement, said pipe being elliptic in cross-section, and said guide wheels including a plurality of guide members for receiving said elliptic pipe and being affixed to the peripheral surface of said guide wheels, said guide members including a curved guide surface of a shape substantially similar to that of the elliptic pipe for supporting said pipe and a pair of projections extending upwardly from opposite sides of the guide surface and having planar surfaces, said projections to prevent dislodging of the pipe from the guide member.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-11-10	1979-05-12	1979-11-11	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-11-10	1983-05-12	1983-11-11	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-11-10	1987-05-12	1987-11-11	$7700.00	Window Closed / Lapsed

Apparatus for heating a pipe made of a thermoplastic synthetic resinous material

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