US2239055A - Gaseous tube bending machine - Google Patents

Gaseous tube bending machine Download PDF

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Publication number
US2239055A
US2239055A US211955A US21195538A US2239055A US 2239055 A US2239055 A US 2239055A US 211955 A US211955 A US 211955A US 21195538 A US21195538 A US 21195538A US 2239055 A US2239055 A US 2239055A
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Prior art keywords
mandrel
tube bending
bending machine
gaseous tube
groove
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Expired - Lifetime
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US211955A
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David F Sawyer
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/04—Re-forming tubes or rods
    • C03B23/06—Re-forming tubes or rods by bending

Definitions

  • This invention relates to a device for bending glass tubes, more particularly for bending glass tubes of the type used in gaseous tube lighting.
  • Gaseous tubes of the neon type are used as light sources for various general illumination purposes, such as tramc signals, indirect interior and exterior illumination with reflectors, etc.
  • the latter types of installations require the tube to be wrapped in a very close spiral of a shape to obtain a concentration of illumination at the focal point of the particular reflector upon which they are to be used.
  • the principal object of this invention is to.
  • Fig. 1 is a side view of the improved tube bending device.
  • Fig. 2 is an end view "thereof taken on the line 2-2, Fig. 1.
  • Fig. 3 is a detail perspective view of a typical coil as formed by the tube bending device.
  • Fig. 4 is a detail view of an alternate form of mandrel for use with the device.
  • the improved tube bending device comprises a vertical standard ll having a bifurcated upper extremity ll, through the legs of which. two aligned pivot screws II are threaded. The poims of these screws rest in receiving depressions in the opposite sides of a nut member II. A threaded shaft II is threaded through the nut member 13 and terminates at one extremity in a hand crank I! or other rotation imparting device.
  • the shaft II is threaded, as shown at IE to receive an attachment collar ll of a forming mandrel IS.
  • the mandrel i8 is formed with a contour to correspond with the desired contour of the coil to be formed. It may be a conical mandrel of any desired inclineor may be a cylindrical mandrel as illustrated at I! in Fig. 4.
  • the mandrel is formed with a continuous, spirally-extending, coil-receiving groove 20.
  • the shaft I4 is formed with a spiral thread-groove II.
  • corresponds with the pitch of the receiving groove 20.
  • the standard Ill supports the mandrel over any suitable heating burner 22 preferably of a type to produce the usual ribbon burner flame.
  • the crank is rotated to bring the first turn of the groove 20 over the burner 22 and the heated glass tube is started around the first turn of the groove 20. It is preferred in a conical coil, to start the first turn at the small end of the mandrel which acts to lock the coil to the end of the mandrel since it can not climb up the incline thereof.
  • the mandrel is then rotated and inclined to maintain the tube over the heating flame and wrap it into the groove 20. Since the thread grooves II are of the same pitch as the grooves 20, the forming portion of of the coil will be maintained over the burner 22 during the entire operation.
  • the operator can tilt the shaft ii to position the mandrel and tube at the proper height above the burner at all times during the winding operation.
  • This tilting action, of the shaft I I is very important upon conical coils, especially upon coils that are wound almost fiat.

Description

April 22,1941. D. F. SAWYER GASEQUS TUBE BENDING MACHINE Filed June 4, 1938 l|..ll IIII I INVENTOR.
BY flaw/a5 iawy e Patented Apr. 22, 1941 UNITED STATES PATENT OFFICE 1 Claim.
This invention relates to a device for bending glass tubes, more particularly for bending glass tubes of the type used in gaseous tube lighting. Gaseous tubes of the neon type are used as light sources for various general illumination purposes, such as tramc signals, indirect interior and exterior illumination with reflectors, etc. The latter types of installations require the tube to be wrapped in a very close spiral of a shape to obtain a concentration of illumination at the focal point of the particular reflector upon which they are to be used.
Heretofore, these spirals have been formed by hand and it is difficult, even for an expert glass worker, to obtain a perfectly contoured coil and to obtain uniformity in the coils.
The principal object of this invention is to.
provide a simple and convenient device for forming coils of any desired shape with a perfect In the following detailed description of the invention reference is had to the accompanying drawinge which forms a part hereof. Like numerals refer to like parts in all views of the I drawing and throughout the description.
In the drawing:
Fig. 1 is a side view of the improved tube bending device.
Fig. 2 is an end view "thereof taken on the line 2-2, Fig. 1.
Fig. 3 is a detail perspective view of a typical coil as formed by the tube bending device.
Fig. 4 is a detail view of an alternate form of mandrel for use with the device.
The improved tube bending device comprises a vertical standard ll having a bifurcated upper extremity ll, through the legs of which. two aligned pivot screws II are threaded. The poims of these screws rest in receiving depressions in the opposite sides of a nut member II. A threaded shaft II is threaded through the nut member 13 and terminates at one extremity in a hand crank I! or other rotation imparting device.
At the other extremity, the shaft II is threaded, as shown at IE to receive an attachment collar ll of a forming mandrel IS. The mandrel i8 is formed with a contour to correspond with the desired contour of the coil to be formed. It may be a conical mandrel of any desired inclineor may be a cylindrical mandrel as illustrated at I! in Fig. 4.
The mandrel is formed with a continuous, spirally-extending, coil-receiving groove 20. The shaft I4 is formed with a spiral thread-groove II. The pitch of the thread groove 2| corresponds with the pitch of the receiving groove 20.
The standard Ill supports the mandrel over any suitable heating burner 22 preferably of a type to produce the usual ribbon burner flame.
In use, the crank is rotated to bring the first turn of the groove 20 over the burner 22 and the heated glass tube is started around the first turn of the groove 20. It is preferred in a conical coil, to start the first turn at the small end of the mandrel which acts to lock the coil to the end of the mandrel since it can not climb up the incline thereof.
The mandrel is then rotated and inclined to maintain the tube over the heating flame and wrap it into the groove 20. Since the thread grooves II are of the same pitch as the grooves 20, the forming portion of of the coil will be maintained over the burner 22 during the entire operation.
The operator can tilt the shaft ii to position the mandrel and tube at the proper height above the burner at all times during the winding operation. This tilting action, of the shaft I I is very important upon conical coils, especially upon coils that are wound almost fiat.
' By tightening the screws 12 suflicient friction may be placed upon the nut to support the mandrel and tube until manually adjusted.-
While a specific form of the improvementhas been described and illustrated herein, it is desired to be understood that the same may. be varied, within the scope of the appended claim,
without departing from the spirit of the invenbifurcated upper extremity; Divot bolts extending oppositely inward into the furcation of said extremity: a nut member pivotally mounted between said bolts, said nut member having a threaded passage extending therethrough at right angles to said bolts; a threaded shaft threaded ceiving groove in the surface of said mandrel, the
spiral of said groove corresponding in pitch to through said passage so as to project from both 5 the pitch of the threads on said shaft.
sides thereof and supported solely by said nut; a. crank'on one extremity of said shaft; a ta- DAVID F. SAWYER.
US211955A 1938-06-04 1938-06-04 Gaseous tube bending machine Expired - Lifetime US2239055A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2494872A (en) * 1945-01-26 1950-01-17 Gen Electric Method and apparatus for bending tubular glass articles
US2504938A (en) * 1947-02-27 1950-04-18 Sylvania Electric Prod Lamp exhaust tube bending apparatus
US2504426A (en) * 1946-07-24 1950-04-18 Albert J Keyzer Method for forming flat spiral glass tubing
US2545271A (en) * 1942-05-28 1951-03-13 Sylvania Electric Prod Glass coiling machine
US2573300A (en) * 1946-05-10 1951-10-30 Corning Glass Works Glass forming apparatus
US4497190A (en) * 1983-09-12 1985-02-05 Morgan Construction Company Apparatus for bending a rolling mill laying pipe
US5244486A (en) * 1992-04-08 1993-09-14 Shin Kwang Enterprise, Co., Ltd. Fluorescent tube coiling apparatus
US5492552A (en) * 1994-03-03 1996-02-20 Minnesota Mining And Manufacturing Company Holder for annealing fiber optic coils
US20030233848A1 (en) * 2002-06-24 2003-12-25 Janes Michael Robert Manual glass lathe and method for using same

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2545271A (en) * 1942-05-28 1951-03-13 Sylvania Electric Prod Glass coiling machine
US2494872A (en) * 1945-01-26 1950-01-17 Gen Electric Method and apparatus for bending tubular glass articles
US2573300A (en) * 1946-05-10 1951-10-30 Corning Glass Works Glass forming apparatus
US2504426A (en) * 1946-07-24 1950-04-18 Albert J Keyzer Method for forming flat spiral glass tubing
US2504938A (en) * 1947-02-27 1950-04-18 Sylvania Electric Prod Lamp exhaust tube bending apparatus
US4497190A (en) * 1983-09-12 1985-02-05 Morgan Construction Company Apparatus for bending a rolling mill laying pipe
US5244486A (en) * 1992-04-08 1993-09-14 Shin Kwang Enterprise, Co., Ltd. Fluorescent tube coiling apparatus
US5492552A (en) * 1994-03-03 1996-02-20 Minnesota Mining And Manufacturing Company Holder for annealing fiber optic coils
US20030233848A1 (en) * 2002-06-24 2003-12-25 Janes Michael Robert Manual glass lathe and method for using same
US6957552B2 (en) 2002-06-24 2005-10-25 Michael Robert Janes Manual glass lathe

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