WO1992006927A1 - Gob plunger chuck assembly - Google Patents

Gob plunger chuck assembly Download PDF

Info

Publication number
WO1992006927A1
WO1992006927A1 PCT/GB1991/001854 GB9101854W WO9206927A1 WO 1992006927 A1 WO1992006927 A1 WO 1992006927A1 GB 9101854 W GB9101854 W GB 9101854W WO 9206927 A1 WO9206927 A1 WO 9206927A1
Authority
WO
WIPO (PCT)
Prior art keywords
plunger
holder
sleeve
mounting plate
gob
Prior art date
Application number
PCT/GB1991/001854
Other languages
French (fr)
Inventor
Lars Tore Anderson
Original Assignee
Bh-F (Engineering) Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bh-F (Engineering) Limited filed Critical Bh-F (Engineering) Limited
Publication of WO1992006927A1 publication Critical patent/WO1992006927A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
    • C03B7/08—Feeder spouts, e.g. gob feeders
    • C03B7/086—Plunger mechanisms

Definitions

  • This invention relates to a gob plunger chuck assembly.
  • the glassware is formed from gobs of molten glass.
  • gobs are obtained by forcing molten glass through an orifice in the floor of a refractory trough containing the molten glass from a glass furnace.
  • the glass is forced through the orifice by means of a vertically reciprocable plunger mounted above the orifice. As the plunger is moved on its downward stroke towards the orifice, the intervening molten glass is forced through the orifice to form a protruding gob. Below the orifice, the gob is cut off and drops away.
  • the glass gobs, while still hot, are led away and undergo further treatment, e.g. the moulding into the desired glassware.
  • the or each plunger is mounted on a plunger support by means of a gob plunger chuck assembly.
  • the plunger support is, in use, reciprocally driven up and down to achieve the upward and downward strokes of the plungers mounted thereon.
  • the vertical position of the plungers above their respective orifices can usually be adjusted by an adjustment of the vertical position of the gob plunger chuck on the plunger support.
  • a gob plunger chuck assembly comprising:
  • a plunger holder mounted for vertical sliding movement in the socket
  • a plunger chuck for receipt of the upper end of a gob plunger.
  • the gob plunger chuck assembly comprises stops determining the maximum upward movement of the plunger holder with respect to the mounting plate. Also there is preferably provided stops determining the maximum downward movement of the holder with respect to the mounting plate.
  • the plunger chuck suitably comprises a sleeve for receipt of the upper end of the gob plunger; means enabling the upper end of the gob plunger to be retained within the sleeve, and means within the sleeve for biasing the upper end of the plunger downwards.
  • Figure 1 is a side view of a double gob plunger, comprising two parallel gob plunger assemblies according to the present invention, each with the loaded position of the plunger being indicated;
  • Figure 2 is a section on the line II-II of Figure 1, and
  • Figure 3 is a plan view of the apparatus of Figure 1, but with only one gob plunger assembly in position.
  • the double gob plunger apparatus comprises a plunger support jig 1 which is provided by means (not shown) for reciprocally driving the plunger support jig 1 upwards and downwards in use.
  • the plunger support jig 1 contains two apertures 2, each for receipt of a plunger chuck assembly according to the present invention. Additionally, alongside each aperture 2, the plunger support jig 1 bears two pairs of latch and latch pillar assemblies, each pair consisting of a latch 3 and a pillar 4, for securing the gob plunger chuck assembly in the respective aperture 2.
  • Each gob plunger chuck assembly 10 according to the present invention comprises a mounting plate 11 having a vertical sleeve 12. The wall of sleeve 12 has in it a vertical slot 13.
  • a plunger holder 14 is mounted for vertical sliding movement within the sleeve 12.
  • the upper part of plunger holder 14 is provided with an external screw-thread 15.
  • a height-adjusting nut 16 and a clamp nut 17 engage the external thread 15 on the part of plunger holder 14 extending above the top of mounting plate 11.
  • Adjusting nut 16 is provided with a compression spring 18, ball-bearing 19 and socket set screw 20.
  • the upper surface of mounting plate 11 is provided with a circle of indentations (not shown) into each of which ball-bearing 19 can engage in order that the adjusting nut 16 can be secured against rotation.
  • clamp nut 17 is provided with an eye bolt 21 to facilitate e.g. removal of the plunger assembly for maintenance.
  • the vertical position of the plunger holder 14 with respect to the sleeve 12 is substantially restricted by the permitted travel of pin 26 in slot 13.
  • plunger holder 14 The lower end of plunger holder 14 is provided with a plunger chuck 28 including a downwardly-extending sleeve 29 having an opposing pair of apertures 30.
  • the plunger chuck 28 also comprises a clamp plate 32 mounted on the lower end of a rod 33.
  • the rod 33 is mounted for vertical sliding movement in a channel 34 within plunger holder 14.
  • a compression spring 35 within plunger holder 14 above rod 33 biases the rod 33, and accordingly also clamp plate 32, downwardly. Compression spring 35 is such that, when clamp nut 17 is in position on plunger holder 14, the required pressure is exerted downwardly.
  • the rod 33 has a portion 36 of narrower diameter.
  • the pin 26 is secured to the plunger holder 14 such that its end 37 extends into the channel 34 in the region of the narrow-diameter portion 36 of rod 33.
  • a plunger 38 which has through it a bore 39.
  • bore 39 is a dowel pin 40 having end pieces 41 of smaller diameter than the central portion 42.
  • Dowel pin 40 is so sized that the end pieces 41 are each located in the apertures 30 in the plunger chuck sleeve 29, while the length of the central portion 42 is less than the internal diameter of chuck sleeve 29.
  • the plungers are generally loaded on to the plunger support jig away from the refractory trough, and are then swung into position for operation after the or each plunger has been loaded.
  • the number of plungers loaded on each plunger support will of course depend on whether a single or multi-gob installation is to be provided.
  • Each plunger chuck assembly 10 is lowered through an aperture 2 in the plunger jig support 1 until the mounting plate 11 rests on the plunger jig support 1.
  • the mounting plate 11, appropriately centrallised, is then secured to the plunger jig 1 by engaged the respective latch 3 and pillar 4 pairs.
  • the latch 3 extends across the top of mounting plate 11 and holds it down on to the plunger support jig 1.
  • the plunger 38 is loaded into plunger chuck 28 by insertion of the plunger from the lower end of sleeve 29 forcing clamp plate 32 upwardly against the biasing of compression spring 35 until the bore 39 in the plunger and the apertures 30 in sleeve 29 coincide.
  • the dowel pin 40 is then inserted into the registered holes and the upward force on the plunger 38 is removed.
  • the biasing provided by compression spring 35, via rod 33 and clamp plate 32, pushes the plunger 38 downwardly with the end pieces 41 of dowel pin 40 come into contact with the lower edges of apertures 30 in sleeve 29, while the large-diameter portion 42 of dowel pin 40 ensures that axial movement of the pin out of either of the apertures 30 is prevented. In this way the plunger 38 is firmly held within the plunger chuck 28.
  • the vertical position of the plunger chuck is adjusted by means of nut 16 engaging the external thread 15 on plunger holder 14.
  • the plunger holder 14 is drawn vertically upwards against the action of compression spring 22 which biases the plunger holder 14 downwards.
  • Upward movement of the plunger holder 14 is restricted by the upper limit of travel of pin 26 in slot 13 and, accordingly, overtightening is prevented.
  • the lower limit of travel of the plunger height is restricted by the lowermost position of pin 26 in slot 13.
  • plunger chuck assembly is tensioned by means of the compression spring 35 applying pressure to rod 33 and clamp plate 32.
  • the pin 26 serves to retain the rod 33 within plunger holder 14 when the plunger is removed from the holder.
  • the plunger support jig 1 and loaded plungers are swung into position above the refractory trough of molten glass and driven reciprocally up and down in line with the orifices for gob formation in conventional manner.
  • the downward bias provided by springs 22 and 35 ensure that the plunger and plunger chuck assembly are resiliently held, and rattling of the plunger is reduced or negated.
  • the operator is able to adjust only the plunger height, using adjusting nut 16 and thus problems of overtightening and overtensioning avoided.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

In the manufacture of glassware a preliminary stage is making gobs of molten glass. The gobs are formed by forcing the glass through an orifice in the floor of a trough containing molten glass. The glass is forced by a plunger mounted in a plunger chuck assembly situated above the orifice. The plunger chuck assembly comprises a mounting plate (1) from which a sleeve (12) projects. A plunger holder (14) is mounted for reciprocal movement in sleeve (12). The holder (14) is biased in one direction along sleeve (12), and has means for adjusting the longitudinal position of the holder (14) relative to the mounting plate (1). A plunger chuck (28) is provided on the end remote from mounting plate (1) into which a plunger (38) is mounted.

Description

GOB PLUNGER CHUCK ASSEMBLY
This invention relates to a gob plunger chuck assembly.
In the manufacture of glassware, such as glass bottles, the glassware is formed from gobs of molten glass. These glass gobs are obtained by forcing molten glass through an orifice in the floor of a refractory trough containing the molten glass from a glass furnace. The glass is forced through the orifice by means of a vertically reciprocable plunger mounted above the orifice. As the plunger is moved on its downward stroke towards the orifice, the intervening molten glass is forced through the orifice to form a protruding gob. Below the orifice, the gob is cut off and drops away. The glass gobs, while still hot, are led away and undergo further treatment, e.g. the moulding into the desired glassware.
For increased gob rate production, there are often used multi-gob installations, in which a plurality of plungers (usually two or three) are mounted in parallel on the same support and reciprocally driven up and down together above a set of orifices such that a plurality of gobs is formed simultaneously on each plunger downward stroke.
The or each plunger is mounted on a plunger support by means of a gob plunger chuck assembly. The plunger support is, in use, reciprocally driven up and down to achieve the upward and downward strokes of the plungers mounted thereon. The vertical position of the plungers above their respective orifices can usually be adjusted by an adjustment of the vertical position of the gob plunger chuck on the plunger support.
In use the plunger, chuck assembly and mounting are all subjected to very severe conditions, particularly of wear and temperature. The effects of these are increased by the high speeds of operation of modern gob-forming apparatus, which high speeds are required to provide the increased production rates necessary. The wear and differential heat expansion both tend to lead to 'plunger rattling' in use. In an effort to prevent this, there is a tendency for operators to overtighten the mounting of the plunger on the chuck assembly: such overtightening can, in its turn, lead to failure of the plunger.
According to the present invention, there is provided a gob plunger chuck assembly comprising:
a mounting plate having a vertically extending socket,
a plunger holder mounted for vertical sliding movement in the socket,
means biasing the plunger holder downwardly in the socket,
means for adjusting the vertical position of the plunger holder with respect to the mounting plate, and
a plunger chuck for receipt of the upper end of a gob plunger.
Preferably the gob plunger chuck assembly according to the present invention comprises stops determining the maximum upward movement of the plunger holder with respect to the mounting plate. Also there is preferably provided stops determining the maximum downward movement of the holder with respect to the mounting plate.
The plunger chuck suitably comprises a sleeve for receipt of the upper end of the gob plunger; means enabling the upper end of the gob plunger to be retained within the sleeve, and means within the sleeve for biasing the upper end of the plunger downwards.
This invention is further illustrated, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a side view of a double gob plunger, comprising two parallel gob plunger assemblies according to the present invention, each with the loaded position of the plunger being indicated;
Figure 2 is a section on the line II-II of Figure 1, and
Figure 3 is a plan view of the apparatus of Figure 1, but with only one gob plunger assembly in position.
Referring to the drawings, the double gob plunger apparatus comprises a plunger support jig 1 which is provided by means (not shown) for reciprocally driving the plunger support jig 1 upwards and downwards in use. The plunger support jig 1 contains two apertures 2, each for receipt of a plunger chuck assembly according to the present invention. Additionally, alongside each aperture 2, the plunger support jig 1 bears two pairs of latch and latch pillar assemblies, each pair consisting of a latch 3 and a pillar 4, for securing the gob plunger chuck assembly in the respective aperture 2. Each gob plunger chuck assembly 10 according to the present invention comprises a mounting plate 11 having a vertical sleeve 12. The wall of sleeve 12 has in it a vertical slot 13.
A plunger holder 14 is mounted for vertical sliding movement within the sleeve 12.
The upper part of plunger holder 14 is provided with an external screw-thread 15. A height-adjusting nut 16 and a clamp nut 17 engage the external thread 15 on the part of plunger holder 14 extending above the top of mounting plate 11. Adjusting nut 16 is provided with a compression spring 18, ball-bearing 19 and socket set screw 20. The upper surface of mounting plate 11 is provided with a circle of indentations (not shown) into each of which ball-bearing 19 can engage in order that the adjusting nut 16 can be secured against rotation. Additionally clamp nut 17 is provided with an eye bolt 21 to facilitate e.g. removal of the plunger assembly for maintenance.
Within the sleeve 12, a compression spring 22 held between a lower face 23 of mounting plate 11 and a shoulder 24 of plunger holder 14 biases the plunger holder downwardly in the socket 12.
A pin 26, which passes through slot 13 in sleeve 12, is secured to the plunger holder 14 below shoulder 24. The vertical position of the plunger holder 14 with respect to the sleeve 12 is substantially restricted by the permitted travel of pin 26 in slot 13.
The lower end of plunger holder 14 is provided with a plunger chuck 28 including a downwardly-extending sleeve 29 having an opposing pair of apertures 30. The plunger chuck 28 also comprises a clamp plate 32 mounted on the lower end of a rod 33. The rod 33 is mounted for vertical sliding movement in a channel 34 within plunger holder 14. A compression spring 35 within plunger holder 14 above rod 33 biases the rod 33, and accordingly also clamp plate 32, downwardly. Compression spring 35 is such that, when clamp nut 17 is in position on plunger holder 14, the required pressure is exerted downwardly.
At a position between compression spring 35 and clamp plate 32, and corresponding substantially to the position of pin 26, the rod 33 has a portion 36 of narrower diameter. The pin 26 is secured to the plunger holder 14 such that its end 37 extends into the channel 34 in the region of the narrow-diameter portion 36 of rod 33.
Within the plunger chuck 28 there is shown the position of a plunger 38 which has through it a bore 39. In bore 39 is a dowel pin 40 having end pieces 41 of smaller diameter than the central portion 42. Dowel pin 40 is so sized that the end pieces 41 are each located in the apertures 30 in the plunger chuck sleeve 29, while the length of the central portion 42 is less than the internal diameter of chuck sleeve 29.
For use, the plungers are generally loaded on to the plunger support jig away from the refractory trough, and are then swung into position for operation after the or each plunger has been loaded. The number of plungers loaded on each plunger support will of course depend on whether a single or multi-gob installation is to be provided.
Each plunger chuck assembly 10 is lowered through an aperture 2 in the plunger jig support 1 until the mounting plate 11 rests on the plunger jig support 1. The mounting plate 11, appropriately centrallised, is then secured to the plunger jig 1 by engaged the respective latch 3 and pillar 4 pairs. In the engaging position, the latch 3 extends across the top of mounting plate 11 and holds it down on to the plunger support jig 1.
The plunger 38 is loaded into plunger chuck 28 by insertion of the plunger from the lower end of sleeve 29 forcing clamp plate 32 upwardly against the biasing of compression spring 35 until the bore 39 in the plunger and the apertures 30 in sleeve 29 coincide. The dowel pin 40 is then inserted into the registered holes and the upward force on the plunger 38 is removed. The biasing provided by compression spring 35, via rod 33 and clamp plate 32, pushes the plunger 38 downwardly with the end pieces 41 of dowel pin 40 come into contact with the lower edges of apertures 30 in sleeve 29, while the large-diameter portion 42 of dowel pin 40 ensures that axial movement of the pin out of either of the apertures 30 is prevented. In this way the plunger 38 is firmly held within the plunger chuck 28.
The vertical position of the plunger chuck is adjusted by means of nut 16 engaging the external thread 15 on plunger holder 14. As the adjusting nut 16 is rotated, the plunger holder 14 is drawn vertically upwards against the action of compression spring 22 which biases the plunger holder 14 downwards. This has the effect that adjustment of the height of the plunger holder 14 is relatively easy against the action of the compression spring 22. Upward movement of the plunger holder 14 is restricted by the upper limit of travel of pin 26 in slot 13 and, accordingly, overtightening is prevented. The lower limit of travel of the plunger height is restricted by the lowermost position of pin 26 in slot 13. Once the plunger holder (and thus the plunger) has been set to the correct height using adjusting nut 16, the nut is secured against rotation by means of engagement of the ball-bearing 19, urged by compression spring 18, in an indentation in the surface of mounting plate 11.
In addition, the plunger chuck assembly is tensioned by means of the compression spring 35 applying pressure to rod 33 and clamp plate 32.
The pin 26 serves to retain the rod 33 within plunger holder 14 when the plunger is removed from the holder.
Once the or each plunger has been loaded into position in the above manner, the plunger support jig 1 and loaded plungers are swung into position above the refractory trough of molten glass and driven reciprocally up and down in line with the orifices for gob formation in conventional manner.
In use the downward bias provided by springs 22 and 35 ensure that the plunger and plunger chuck assembly are resiliently held, and rattling of the plunger is reduced or negated. The operator is able to adjust only the plunger height, using adjusting nut 16 and thus problems of overtightening and overtensioning avoided.

Claims

1. A gob plunger chuck assembly, comprising: a mounting plate having a sleeve projecting from it; a plunger holder mounted for reciprocal movement in the sleeve; means biasing the holder in one direction along the length of the sleeve; means for adjusting the longitudinal position of the plunger holder with respect to the mounting plate, and a chuck mounted on the end of the holder remote from the mounting plate for receipt of the respective end of a gob plunger.
2. An assembly as claimed in claim 1, in which the movement of the plunger holder relative to the sleeve is limited in at least one axial direction.
3. An assembly as claimed in claim 2, in which the plunger holder has projecting from it a stud which is a sliding fit in an elongated aperture in the sleeve.
4. An assembly as claimed in any preceding claim, in which the plunger chuck includes a sleeve for housing the end of the gob plunger; in which the gob plunger can be releasably retained within the sleeve, and in which the sleeve houses a member adapted to contact the gob plunger to bias it outwardly of the sleeve.
5. An assembly as claimed in claim 4, in which the biasing member is contacted by a rod sidably mounted within the plunger holder one end of the rod being contacted by a compression spring extending between the rod and an end cap secured to the respective end of the plunger holder.
6. An assembly as claimed in claims 3 and 5, in which the axial movement of the rod relative to the holder is restricted by an inner end of the stud projecting into an annular chamber formed by a length of the rod being of smaller diameter than that engaging the plunger holder.
7. An assembly as claimed in any preceding claim, in which part of the plunger holder projects from that side of the mounting plate remote from the sleeve, that part of the holder being screw-threaded and engaged by a nut bearing on the mounting plate to control the axial position of the holder relative to the mounting plate.
8. An assembly as claimed in claim 7, in which the nut has within it a detent mechanism adapted to cooperate with a series of recesses in the surface of the mounting plate so that the nut can be kept in any of a series of angularly-spaced detent positions.
9. A gob plunger comprising at least two chuck assemblies as claimed in any preceding claim mounted in a common holder which is adapted to be reciprocated to and fro the gob-forming orifices, each assembly being held in place in the holder by means of at least one pivotal latch adapted to bear on a surface of the mounting plate and to be clamped in its latching position.
PCT/GB1991/001854 1990-10-23 1991-10-23 Gob plunger chuck assembly WO1992006927A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9023010.3 1990-10-23
GB909023010A GB9023010D0 (en) 1990-10-23 1990-10-23 Gob plunger chuck assembly

Publications (1)

Publication Number Publication Date
WO1992006927A1 true WO1992006927A1 (en) 1992-04-30

Family

ID=10684193

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/001854 WO1992006927A1 (en) 1990-10-23 1991-10-23 Gob plunger chuck assembly

Country Status (5)

Country Link
AU (1) AU8857391A (en)
CS (1) CS321491A3 (en)
GB (1) GB9023010D0 (en)
WO (1) WO1992006927A1 (en)
ZA (1) ZA918403B (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1171891A (en) * 1967-08-14 1969-11-26 Maul Bros Inc Glass Feeders.
US3711266A (en) * 1971-05-12 1973-01-16 Emhart Corp Plunger support means for molten glass feeder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1171891A (en) * 1967-08-14 1969-11-26 Maul Bros Inc Glass Feeders.
US3711266A (en) * 1971-05-12 1973-01-16 Emhart Corp Plunger support means for molten glass feeder

Also Published As

Publication number Publication date
AU8857391A (en) 1992-05-20
ZA918403B (en) 1992-07-29
CS321491A3 (en) 1992-05-13
GB9023010D0 (en) 1990-12-05

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