US3837567A - Locking device for machine frame cover - Google Patents

Locking device for machine frame cover Download PDF

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Publication number
US3837567A
US3837567A US00349552A US34955273A US3837567A US 3837567 A US3837567 A US 3837567A US 00349552 A US00349552 A US 00349552A US 34955273 A US34955273 A US 34955273A US 3837567 A US3837567 A US 3837567A
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United States
Prior art keywords
cover
hose
frame
combination
cavity
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US00349552A
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English (en)
Inventor
C Nilson
S Olsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alfa Laval AB
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Alfa Laval AB
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Filing date
Publication date
Application filed by Alfa Laval AB filed Critical Alfa Laval AB
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Publication of US3837567A publication Critical patent/US3837567A/en
Anticipated expiration legal-status Critical
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/08—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body in connection with the locking of doors, covers, guards, or like members giving access to moving machine parts

Definitions

  • the present invention relates to cover-locking devices for machines having a rotor, such as a centrifuge rotor, enclosed by a frame and a movable cover coacting with the frame. More particularly, the invention relates to such a locking device of the type having a hollow member which is provided with a cavity expansible under the influence of a pressure therein and which is arranged to lock the cover to the frame while the cavity is in an expanded condition, the cavity being kept filled with a fluid and thus expanded at least as long as the machine is running.
  • the present invention has for its object to eliminate this disadvantage and to effect a locking of the cover to the frame along a long distance of the cover edge, while pressing the latter against the frame.
  • a locking action which extends along the whole cover edge and at the same time effects a seal would be particularly advantageous.
  • the hollow member in the form of a hose, preferably of elastic material, which is arranged to lie in an expanded condition against supporting surfaces on the cover as well as on the machine frame, which surfaces are so shaped that removal of the cover from the frame is prevented while the hose is thus expanded.
  • a non-return valve is preferably inserted in the supply pipeline for the fluid.
  • the mechanical locking of the cover of the machine frame is characterized in that a supporting surface on the cover (or the machine frame) is movable, as by being pivotable, and under the influence of the expansion of the hose cavity is caused to lie against a stop on the machine frame (or the cover).
  • the pump of the auxiliary system can advantageously be the source of the supply of the pressure fluid.
  • a measure of security can be effected according to the invention by providing a means which senses the pressure of the fluid and, when the pressure disappears, initiates stopping of the machine.
  • a delaying relay for example, the impulse for stopping the machine can be suppressed so that in spite of missing pressure in the cavity, starting of the machine is made possible.
  • FIGS. 1 and 2 are vertical cross-sectional views of parts of a machine frame and cover provided with one form of the new locking device and showing the cover when released from the locking device and when locked by this device, respectively;
  • FIGS. 3, 4 and 5 are schematic side elevational views of machines having three different arrangements for supplying fluid to the locking device. In the different figures, corresponding details have the same reference numerals.
  • a centrifuge frame is shown in part at 1, and reference numeral 2 indicates schematically part of the centrifuge rotor which is mounted in the frame for rotation about a horizonta axis.
  • the frame 1 is provided with a cover shown in part at 3 and which can be unlocked for upward movement from the frame (FIG. 1), to permit access to the rotor and the interior of the frame, or locked to the frame (FIG. 2).
  • the left-hand edge of the cover has at least one flap 5 which is pivotable about a horizontal pin 4 on the cover and which, when the cover is locked to the frame, takes the position shown by broken lines at 5a in FIG. 1.
  • the cover 3 has the shape of the upper half of a horizontal hollow cylinder; and its right-hand edge (not shown) can be designed in the same way as the left-hand edge or can be fixed pivotably to the underlying right-hand part (not shown) of the machine frame.
  • the locking arrangement shown in FIGS. 1 and 2 is not duplicated at the righthand parts of the cover and frame.
  • the flap 5 may extend a substantial distance along the straight left-hand side of cover 3, which coacts with the underlying straight side of frame 1, or a series of short flaps may be provided on the cover.
  • the upper part of frame 1 is provided with a groove or furrow 6 having a vertical outer wall 7 and a horizontal flange 8 extending outwardly from the rotor 2 and the inner wall of the furrow 6.
  • the flange 8 is located above the level of the top of wall 7 and is substantially narrower than the furrow 6 so as to provide an entrance gap for the flap 5, as will appear presently.
  • a rubber hose 9 is located in furrow 6 and extends along the furrow below the flange 8.
  • hose 9 is in its contracted condition so that it permits the flap 5 to enter the furrow 6 and swing inwardly below the hose as the cover is lowered toward the frame, this condition of the hose also permitting withdrawal of the flap from the furrow as the cover is raised from the frame.
  • the hose in its expanded condition as shown in FIG. 2, it presses the flap 5 against the bottom of furrow 6 and at the same time presses the edge of cover 3 against the furrowss outer wall 7, thereby ensuring the desired locking action to prevent displacement of the cover from its closed position in FIG. 2.
  • FIG. 3 shows an electric three-phase motor which drives the centrifuge rotor about its horizontal axis of rotation.
  • the supply of current to the motor is effected by means of a three-phase cable 11, in which there is inserted a contactor 12 with start and stop buttons 13 and 14.
  • the wall of frame 1 is shown broken away at the right-hand lower corner of the frame. In this corner an oil sump 15, belonging to the lubrication system of the centrifuge, is visible.
  • Extending from the sump is a pipeline 16 in which there is inserted a pump 17, shown symbolically and driven by the centrifuge rotor.
  • a nonreturn valve 18 is also inserted in this pipeline.
  • the pipeline 16 opens into a pipeline 19 for the supply of lubricating oil to the hose 9, and a return pipeline 20 leading to the oil sump is in turn connected to the pipeline 19.
  • a pressure-unloading valve 21 which in opened position has a small through-flow area.
  • the pipeline 19 is provided with a contact manometer 22 which, when indicating a pressure loss in the hose 9, actuates via an electric cable 23 a control circuit of the contactor 12 so that the latter switches off the current supply to the motor 10.
  • a relay 24 In the cable 23 is a relay 24, which delays for a suitable space of time the switching-off impulse of the manometer.
  • the arrangement according to FIG. 3 operates in the following way.
  • the valve 21 Before a start of the centrifuge, the valve 21 is closed and the hose 9 is without pressure and consequently unexpanded, as shown in FIG. 1.
  • lubricating oil is forced by the pump 17 into the hose, so that the latter swells (see FIG. 2) and locks the cover to the frame.
  • the centrifuge rotor After completion of the centrifuging and the current supply to the motor 10 has been switched off, the centrifuge rotor continues rotating for a while.
  • the effect of the pump 17 decreases, but due to the non-return valve 18 a desirable locking pressure is still maintained in the hose 9.
  • the valve 21 can be opened manually, so that the lubricating oil in the hose 9 flows back to the oil sump 15.
  • the revolution counter can be arranged to initiate, in its zero position, opening of the valve 21.
  • the latter in its opened position has so small a through-flow area that if the'valve 21 is inadvertently opened during the running of the centrifuge or before it has stopped, the pump 17 despite the draining of oil through the valve 21 will keep the hose 9 filled with oil.
  • FIG. 4 a container 15a for oil or water is shown situated outside the machine frame.
  • This container has the same purpose, as regards the locking device, as the container 15 in FIG. 3.
  • the pump 17 in FIG. 4 is driven by a separate electric motor 25, which via a threephase cable 26 is switched on and off by the contactor 12. In this embodiment, the pump 17 stops when the motor 25 is switched off.
  • the necessary locking pressure in the hose 9, after the switching-off of the contactor, is maintained in this case only by the non-return valve 18.
  • the hose 9 is connected via a pipeline 27 to a separate pressure source 28, such as a municipal water pipeline, which thus maintains a permanent pressure whether or not the centrifuge is running.
  • a separate pressure source 28 such as a municipal water pipeline
  • an electromagnetically operated valve 29 which, via an electric cable 30, iws opened when the contactor 12 is switched on and is closed when the contactor is switched off.
  • the necessary locking pressure is maintained in the hose 9 only by the non-return valve 18, after the contactor has been switched off. If water is used as pressure fluid, it can discharge to drain through a pipeline 20a, when the valve 21 is opened.
  • a locking device comprising an expansible hose having a cavity, said frame and cover having supporting surfaces engageable by the hose in an expanded condition thereof to lock the cover in said closed position, said supporting surfaces including a surface of the frame engaging the hose from above and a surface of the cover engaging the hose from below in said closed position of the cover, and control means for maintaining said cavity filled with fluid to hold the hose in said expanded condition during rotation of the rotor at said working speed, said means being operable to discharge fluid from said cavity and thereby contract the hose to a condition in which said surfaces permit movement of the cover from said closed position.
  • control means include a supply pipeline for said fluid, and a non-return valve in said pipeline.
  • said supporting surfaces also include a stop fixed to said frame, said surface of the cover being displaceable relative to the cover and being movable against said stop by expansion of the hose to said expanded condition.
  • control means include an auxiliary system of the machine containing a liquid and including a pump for delivering liquid under pressure to said cavity.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Centrifugal Separators (AREA)
US00349552A 1972-04-12 1973-04-09 Locking device for machine frame cover Expired - Lifetime US3837567A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE04695/72A SE361137B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-04-12 1972-04-12

Publications (1)

Publication Number Publication Date
US3837567A true US3837567A (en) 1974-09-24

Family

ID=20264769

Family Applications (1)

Application Number Title Priority Date Filing Date
US00349552A Expired - Lifetime US3837567A (en) 1972-04-12 1973-04-09 Locking device for machine frame cover

Country Status (8)

Country Link
US (1) US3837567A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS4993200A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA969151A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2317105A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2180292A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1416202A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT981800B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE361137B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538472A1 (fr) * 1982-12-23 1984-06-29 Kompositprodukter Sk Fm Ab Rotor renforce par un bandage composite, et procede pour renforcer un rotor
US20040178127A1 (en) * 2003-03-12 2004-09-16 Westfalia Separator Ag Centrifugal drum for a separator
US20080251515A1 (en) * 2007-04-12 2008-10-16 Baughman Gary M Container and lid combination with a sealing gasket and closing ring
US20100273628A1 (en) * 2007-12-07 2010-10-28 Atsushi Onodera Horizontal centrifugal separator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2948360B1 (de) * 1979-11-30 1981-05-27 Paul 5419 Döttesfeld Kunz Drehbar gelagerter Druckbehaelter
GB2186431B (en) * 1986-02-07 1989-11-01 Sperry Sun Inc Assemblies for supporting electrical circuit boards within tubes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2325406A (en) * 1941-07-12 1943-07-27 American Laundry Mach Co Cover lock and extractor control
US2836186A (en) * 1955-12-14 1958-05-27 Gen Electric Washing apparatus with tub sealing system
US2919910A (en) * 1958-06-03 1960-01-05 Charles M O'leary Air pressure control system
US3142234A (en) * 1959-12-21 1964-07-28 Fred V Maloon Manhole shield

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2325406A (en) * 1941-07-12 1943-07-27 American Laundry Mach Co Cover lock and extractor control
US2836186A (en) * 1955-12-14 1958-05-27 Gen Electric Washing apparatus with tub sealing system
US2919910A (en) * 1958-06-03 1960-01-05 Charles M O'leary Air pressure control system
US3142234A (en) * 1959-12-21 1964-07-28 Fred V Maloon Manhole shield

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538472A1 (fr) * 1982-12-23 1984-06-29 Kompositprodukter Sk Fm Ab Rotor renforce par un bandage composite, et procede pour renforcer un rotor
US20040178127A1 (en) * 2003-03-12 2004-09-16 Westfalia Separator Ag Centrifugal drum for a separator
US7331919B2 (en) * 2003-03-12 2008-02-19 Westfalia Separator Ag Centrifugal drum for a separator
US20080251515A1 (en) * 2007-04-12 2008-10-16 Baughman Gary M Container and lid combination with a sealing gasket and closing ring
US20100273628A1 (en) * 2007-12-07 2010-10-28 Atsushi Onodera Horizontal centrifugal separator
US8529425B2 (en) * 2007-12-07 2013-09-10 Tomoe Engineering Co., Ltd. Horizontal centrifugal separator in which the hermeticity of a casing is improved by using a sealing element having a simple structure

Also Published As

Publication number Publication date
FR2180292A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-11-23
JPS4993200A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-09-05
SE361137B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-10-22
GB1416202A (en) 1975-12-03
IT981800B (it) 1974-10-10
DE2317105A1 (de) 1973-10-18
CA969151A (en) 1975-06-10

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