US2498456A - Tube removing mechanism - Google Patents

Description

Feb. 21, 1950 G. G. SCHNEIDER TUBEVREMOVING MECHANISM Original Filed Feb. 1'7, 1945 IN V EN TOR. GERHARD GUNTHEE SCHNEIDER Patented Feb. 21, 1950 I ssi neratio O ange; v

adiq v terans eerr tiee ei flclelaware Substituted for ahandonediapplication Serial No.

578,484, Eehmiar .5-

im l c tio 15 Glaims.

In t e manuf ur e adio leetrcn ubeeiit is necessary with certain tubes, before the tube is finished, to xhaust h eas s hereirqm- Be this purpose, a hollow glass rod, commonly called an exhaust b is rm d, integr W ththe base of the electron tube and.communicates with the interior thereof. Through the. exhaust tub he gases are withdrawn from the electrontube tocreate a vacuum therein. After the gases, are withdrawn or exhausted, the exhaust tube. is sealed and severed adjacent thebase. oi thevac: uum tube, These operations are-periorrned. me: chanically on machines, d signed for thelpurpose, that are common and well known in 'thejart. During these operations, the exhaust tube. ex.- tends into a compression chuck and upon, severance from the vacuum tube, the exhaust tube must be r o d om. he huck It 15 0 the removal f th se e ed xh us t beha h invention relates.

Heretofore, and prior to the invention herein disclosed, mechanical tube pullershavebeen used for removing the severed exhaust tube. These include mechanical. grippers whichgrip the exhaust tube and raise it out of the chuck. 'Ithas been found to be difficult to control-the tension and slippage of such mechanical grippers with the result that at times th exhaust tube is not removed from the chuck or is broken in'the process. the exhaust port of the chuck'clogs the port and oil traps and-increases thedead or non-productive time of the machine.

An object of this invention is to providean exhaust tube removing mechanismwhich doesinot depend upon mechanical grippers for removin the tube. Another object of the invention is to provide a mechanism of this kind that removes the exhaust tube by the application, of air under pressure. A further object of the invention is to provide a mechanism of this kind thatremoves, in addition to the exhaust. tubenany pare ticles-of glass that may have fallen in the chuok when the exhaust tube is severed.

In the latter case, the broken glass over '2, s. il u a ed, in he h w-irew er ie lazlv nee machines. Thisis,theuseftowhich the inv ea e e e e en ut seiull em WHL however, e p are t f m. h l win il scriptionof the mechanism, so vapplied, that 211,? inv nti amev w be nzelie e he 1 s In h RCeS lW-e d Hum e n-iachines there is a horizontal dial l which is o atable ebeut e en ieel he e eeej ure tv Q mpr si n e lssz. s te en one and twentyefou'r ontheother. Thedials are actuated step by step to index the, e ee ullv ee eadi g.- nes en. r u h ev position svto the position (shown in thl drawing) in whi ht e ex us tub remov e 1. 15 2-v Eeeh h k, es'the hu k}? vided withra vertical opening} in which thee? we ub s ece ed- Thi Opening l t wit en. exhau t. t wh h is eenne t di n ce ainindese m ti e e ih die We tet PW P: he-mac. s lead b'v lefe nelth' exha s ube in a check. a d he. en-mov from, pesi ien e es t ee the ele t i beis exhauste thr u h the exh u t t e an t haust tube is severed adjacent the electron tube. The, chuck is then carried by vthe. dial to the, p95;- 21 r ve l d: exhet t' e th eh elseon w ieh pesitien h ek'e 'eih 'BEQVQ .W p %qi P-$i?i? n theeeeemeenv e dre -ins t c ucks-is nast e i wh n th exha e mo ed The me anism f' i nve tion p e r e eiv a tach d t h w bel 1 a chuck is broughtinto. this pos'itionit maybe moved manual -er ev vmetiewli. r e a the lat er Im e a i e pes ie t s ion hown -drevine- Th e e i f the c eniem t uch a m h ne an t act ation fr inoperative to operative position are considered to be,

The foregoing objects and certain advantages w that will hereinafter appear are, realizedniingthe embodiment of the invention illustrated in-,-the drawing, as an example ofthe bestme thod applying the invention, and described in, det 1 be.-

l-ow, from which description 9, clearer understandexhaust tube.

'ture and through the fixture.

external diameter of the exhaust tube to be removed, such as the tube I I]. The portion 8 of the inner element constitutes an extension from the portion 1 of substantially smaller external diameter and forms the inner wall of an annular air passage II. The free end of the portion 8 is flared outwardly as at I2.

The outer element 6 of the fixture includes a portion I3 that surrounds the portion I of the inner element, making a substantially air tight fit therewith. The two elements are adjustable, longitudinally, and are secured together in adjusted position by a set screw I4. The, portion I3 of the element 6 extends slightly beyond the lower end of the portion 1 of the inner element 5. A thin walled portion I5of the element 6 extends from the portion l3 and is provided with an inwardly extending end wall I6. This thin walled portion constitutes the outer wall of the air passage II. The inner surface of the end wall IB is somewhat frustro-conical, as shown, and forms with the fiared end I2 of the portion 8 of the inner element 5, a circular air blast passage I'I inclined to the axis of the fixture and directed into the axial opening therethrough in a direction such that upon the flow of air under pressure a force is created on the tube II] in a direction to lift the tube out of the chuck 2. In addition, the air blast through the passage 1 creates a suction below the fixture which removes any particles within the chuck. The velocity, fora given air pressure, of the air through the passage ll may be regulated by varying the passage. tive longitudinal adjustment of the inner and outer elements 5 and 6.

The wall of the portion I3 of the outer element is drilled and tapped at l8 to provide a connection for an air pipe I9. This pipe is connected through a control valve 20 to a source of air under pressure represented by a pipe 2 I. The

valve 20 is of the type that is spring pressed to stem 22, engages a cam 23 mounted on a shaft 24 that is rotated in timed relation with respect "to the operation of the machine. In this way, the valve is periodically opened when the air chuck or fixture 4 is in operative position over an Air thus passes through the air passage II, the blast passage I1 and axially through the fixture in a direction away from the chuck 2. The suction created below the blast passage removes any particles in the chuck 2 and they are carried into the air stream in the fix- The upper end of the fixture 4 extends into the end of a curved duct or conduit 25 through which the tube and particles are delivered to a waste receptacle (not shown). The radius of curvature of the duct is such, in accordance with its inner diameter and the dimensions of the exhaust tubes to be removed, that the removed exhaust tube may readily be carried around the curve. The duct is curved through one hundred and eighty degrees. The air blast carries the rethe waste receptacle.

From the foregoing description of the embodiment of the invention illustrated in the drawings and described in detail above, it will be apparent "to those skilled in the art that by the invention I This is accomplished by rela- 4 there is provided a mechanism for conveying rods and particles, a mechanism which effectively removes a rod from a holder and cleans the holder of any particles, and that is especially suitable for removing fragile rods such as the exhaust tubes severed from electron tubes.

It will be obvious that various changes may be made by those skilled in the art in the details of the mechanism illustrated in the drawing and described above within the principle and scope of the invention as expressed in the appended claims.

This application is a substitute for abandoned application Serial No. 578,484, filed February 17, 1945.

What is claimed is:

1. A mechanism for withdrawing a rod from a holder which mechanism comprises in combination a source of air under pressure, an air fixture having a jet for acting upon the rod, and a connection between said source of air under pressure and said fixture including means for controlling the supply of air to said fixture.

2. A mechanism for withdrawing a rod from a holder which mechanism comprises in combination a source of air under pressure, an air fixture having a jet for acting upon the rod, a connection between the source of air under pressure and said fixture including means for controlling the supply of air to said fixture, and means for directing the course of a rod removed from the holder.

3. A mechanism for withdrawing a rod from a holder, which mechanism comprises in combination a fixture adapted to receive the rod, the fixture having air passages therein directed to effect a stream of air along the rod and in a direction to remove the rod from the holder.

4. A mechanism for withdrawing a rod from a holder, which mechanism comprises in combination a fixture adapted to receive a portion of the rod, the fixture having air passages arranged to direct a stream of air along the surface of the rod to exert a force on the rod in a direction to withdraw the rod from the holder.

5. A mechanism for withdrawing a rod from a holder, which mechanism comprises in combination a fixture adapted to receive a portion of the rod, the fixture having air passages arranged to direct a stream of air along the surface of the rod to exert a force on the r d in a direction to withdraw the rod from a holder, and means associated with said fixture for di recting the course of a rod removed from the holder.

6. A mechanism for Withdrawing a rod from a holder, which mechanism comprises in combination a fixture adapted to receive a portion of the rod, the fixturehaving air passages arranged to direct a stream of air along the rod and create a suction below the fixture, and means associated with the fixture for directing the course of a rod and any particles removed from the holder. v

'7. In a machine for exhausting glass containers through an exhaust tube, mechanism for removing the exhaust tube from a holder which mechanism comprises in combination a fixture adapted to receive a portion of the exhaust tube, the fixture having air passages therein directed to efiect a stream of air along the exhaust tube and in a direction to remove the exhaust tube from the holder.

8. In a machine for exhausting glass containers through an exhaust tube, mechanism for removing the exhaust tube from a holder which mechanism comprises in combination a fixture adapted to receive a portion of the exhaust tube, the fixture having air passages arranged to direct a stream of air along the surface of the exhaust tube to exert a force on the rod in'a direction to withdraw the exhaust tube from the holder. 9. In a machine for exhausting glass containers through an exhaust tube, mechanism for removing the exhaust tube which mechanism comprises in combination a fixture adapted to receive a portion of the exhaust tube, the fixture having air passages arranged to direct a stream of air along the surface of the rod to exert a force on the exhaust tube in a direction to withdraw the exhaust tube from a holder, and means associated with said fixture for directing the course of an exhaust tube removed from the holder.

10. In a machine for exhausting glass containers through an exhaust tube, mechanism for removing the exhaust tube which mechanism comprises in combination a fixture adapted to receive a portion of the exhaust tube, the fixture having air passages arranged to direct a stream of air along the exhaust tube and create a suction below the fixture, and means associated with the fixture for directin the course of an exhaust tube and any particles removed from the holder.

11. In a machine for exhausting electron tubes through an exhaust tube held in a chuck, mechanism for removing a severed exhaust tube comprising in combination a fixture having a central opening therethrough adapted to receive a portion of the severed exhaust tube, air passages directed into the central opening and in a direction to exert a force on the tube to remove the tube from the chuck, and means for directing the course of an exhaust tube removed from the chuck.

12. In a machine for exhausting electron tubes through an exhaust tube held in a chuck, mechanism for removing a severed exhaust tube from the chuck, which mechanism comprises in combination a fixture having a central passage therethrough adapted to receive a portion of a tube held by a chuck, air passages directed into the central passage in a direction to exert a force on the tube to remove the tube from the chuck, a source of air under pressure connected to said air passages, and means intermediate said source of air under pressure and said air passages of said fixture for controlling communication therebetween.

13. In a machine for exhausting electron tubes through an exhaust tube held in a chuck, mechanism for removing a severed exhaust tube from the chuck, which mechanism comprises in combination a fixture having a central passage therethrough adapted to receive a portion of a tube held by a chuck, air passages directed into the central passage in a direction to exert a force on the tube to remove the tube from the chuck, a source of air under pressure connected to said air passages, and means intermediate said source of air under pressure and the air passages of said fixture for controlling communication therebetween, and means for directing the course of an exhaust tube removed from the chuck.

14. In a machine for exhausting electron tubes through an exhaust tube held in a chuck, mechanism for removing a severed exhaust tube from the chuck, which mechanism comprises in combination a fixture having a central passage therethrough adapted to receive a portion of a tube held by a chuck, air passages directed into the central passage in a direction to exert a force on th tube to remove the tube from the chuck, a source of air under pressure connected to said air passages, and means intermediate said source of air under pressure and the air passages of said fixture for controlling communication therebetween, and means for directing the course of an exhaust tube removed from the chuck consisiting of a conduit having one end thereof arranged to communicate with the central passage through said fixture.

15. In a machine for exhausting electron tubes having a chuck for receiving the end of an exhaust tube on an electron tube, mechanism for removing a severed exhaust tube from the chuck and particles thereof within the chuck which mechanism includes a fixture having a central passage therethrough adapted to receive a portion of the severed exhaust tube and adapted to be positioned adjacent the chuck, air passages in the fixture including passages directed into the central passage in a direction away from the chuck, whereby upon the delivery of air under pressure to the fixture the exhaust tube is removed from the chuck and a suction is created in the chuck which removes any particles therein, and means for directing the course of an exhaust tube and the particles removed from the chuck.

GERI-IARD GUNTHER SCHNEIDER.

REFERENCES CITED UNITED STATES PATENTS Name Date Ledig et al. Aug. 30, 1927 Number

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