US3356222A - Locking and release mechanism for a washing machine balancing device - Google Patents

Locking and release mechanism for a washing machine balancing device Download PDF

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Publication number
US3356222A
US3356222A US538304A US53830466A US3356222A US 3356222 A US3356222 A US 3356222A US 538304 A US538304 A US 538304A US 53830466 A US53830466 A US 53830466A US 3356222 A US3356222 A US 3356222A
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Prior art keywords
masses
drum
locking
washing
chamber
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Expired - Lifetime
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US538304A
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English (en)
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Belaieff James Frank
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Frame SA
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Frame SA
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
    • D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal axis
    • D06F37/225—Damping vibrations by displacing, supplying or ejecting a material, e.g. liquid, into or from counterbalancing pockets

Definitions

  • ABSTRACT OF THE DISCLOSURE A locking mechanism for retaining eccentrically mounted balancing masses in a fixed position with respect to the drive shaft on a rotating drum washing machine.
  • the balancing masses are aligned by the locking mechanism so that the center of gravity of the masses lies along the axis of the drive shaft until the rotating drum attains a predetermined critical speed at which time the masses are released in order to perform their balancing function.
  • the invention relates to clothes washing and centrifuging machines, of the type comprising a drum rotating about a non-vertical axis and provided with a balancing device comprising two water-tight chambers arranged symmetrically with respect to the transverse plane of symmetry of the basket and concentrically with respect to its axis of revolution and which are rigidly secured to the drum, each chamber being partly filled with a liquid and containing at least two eccentric masses which are journalled on the driving shaft of the basket so as to be freely rotatable.
  • a known clothes washing machine of this type comprises at least one balancing member which is constituted by at least two masses which are freely movable in an oil-filled chamber. During washing the masses are inoperative because the oil circulation produced by the rotary movement of the chamber is insufficient to drive the masses.
  • said masses move in the direction of the unbalance produced by the washing and as a result cause the suspended assembly to produce irregular oscillations of large amplitude.
  • the known machine is normally constructed with two balancing members arranged on either side of the drum in which synchronization of the driving of the masses between each balancing member cannot be achieved.
  • a displacement of a few degrees of the position of the masses is sufficient to produce disturbing moments on the shaft of the drum which produce irregular movements in the suspended assembly.
  • each chamber includes a locking device which, when the drum is rotated at a speed lower than its critical speed, determines the position of the eccentric masses relative to one another in such manner that the centre of gravity of the assembly of said masses becomes located on the axis of revolution of the drum and, when the drum is driven at a speed higher than its critical speed, releases the eccentric masses under the influence of the centrifugal force, the masses then taking a suitable position for compensating for the unbalance of the drum.
  • FIGURE 1 shows a side elevation in partial cross-section of a washing machine which includes a balancing device
  • FIGURE 2 is a plan view partly in cross-section of the machine shown in FIGURE 1;
  • FIGURE 3 is a side elevational view in partial crosssection of a water-tight chamber of a first embodiment of the balancing device
  • FIGURE 4 is a cross-section of FIGURE 3;
  • FIGURE 5 is a side elevational view in partial cross section of a water-tight chamber of a second embodiment of the balancing device.
  • FIGURE 6 is a cross-section of FIGURE 5.
  • the machine shown comprises a rotating drum 1 comprising a horizontal driving shaft 2 which coincides with its axis of revolution, the ends of the said shaft rotating in bearings 3 provided outside the tub 4 of the machine.
  • Flexible connections 5 ensure the tightness of the tub 4 at the point where the shaft 2 is passed through the Walls.
  • the tub 4 is rigidly secured to the frame 6 of the machine, 'while the drum is suspended with respect to the frame 6, that is to say it is connected to the frame 6 through tension springs 7 and shock absorbers 8 and it can thus move in three orthogonal directions.
  • the tub 4 has an aperture which can be closed by means of a lid 9 pivotably secured to the frame 6 of the machine.
  • the basket 1 On its periphery 11, the basket 1 comprises a lid 10 for putting the washing into the drum and removing it again.
  • the balancing device comprises two equal chambers 12 arranged on either side of the rotating drum.
  • Each of the chambers 12 is water-tight and is constituted by a lid 13 which is rigidly secured to the side wall 14 of the drum 1.
  • This chamber 12 is arranged concentrically to the driving shaft 2 of the drum.
  • the ends 15 of the driving shaft 2 rotate in bearings 3 which are mechanically secured to the frame 6 of the washing machine.
  • Each water-tight chamber 12 is constituted by a bottom which is either formed directly by the side wall 14 of the drum or, more generally, by a strengthening member 18 which is secured to the side wall 14 and by a lid 13 which is rigidly secured to the bottom in such a manner that a water-tight chamber 12 is formed.
  • each mass 16 is arranged, each comprising a radial arm 19 which is journalled on the driving shaft 2 of the drum.
  • each mass has the shape of a semicircular segment, the diameter of which is smaller (of the order of 0.5 to 2 cms. than the inside diameter of the chamber 12.
  • the thickness of the masses 16 is less than half the thickness of the chamber 12 and the masses rotate beside one another on the driving shaft 2.
  • Each chamber 12 comprises a device for locking the eccentric masses 16 in position located diametrically opposite to one another as shown-in FIGURE 3.
  • the masses 1-6 can be fixed relativeto the chamber 12 in such positions that the centre of gravity of the assembly of the said two-masses 16 becomes located on the driving shaft 2.
  • these masses are thus locked, they increase the inertia of the drum 1", but remain inoperative as regards the balancing hereof.
  • the locking device is constituted by cams 20 bolted to a leaf spring 21 which is secured to the peripheral wall of the chamber 12.
  • Each mass 16 is held in its position by two cams 20 located diametrically opposite to one another the front faces 22 of which each contact a face 23 of the corresponding mass 16.
  • This face 23 of the mass 16 comprises two lugs 35 for fixing the radial position of the cams 20 in the locked position of the masses 16.
  • leaf springs 21 are integral with a circular tape 24 which engages the inner surface of the chamber 12 in a flexible manner so as to be taken along in the direction of rotation of the chamber by the frictional force.
  • the force of the leaf springs 21 and the mass of the cams 20 are determined; such that, when the drum exceeds the critical speed, the centrifugal force on each of the said bolts is sufficient to move them radially in the direction of the peripheral wall of the chamber 12 against the flexible action of the leaf springs 21, so that said cams 20 are released from the faces 23 of the masses 16.
  • These masses which are still driven by the oil which partly. fills the chamber arereleased and then assume such a position as to compensate for the unbalance of the basket.
  • the masses 16 perform only a restricted angular movement which at any rate is less than 180. This is very important for, on the one hand the balancing of the vessel or basket iselfected substantially immediately after releasing the masses 1 6 and, on the other hand, the phenomenon ofthe oscillations of great amplitude produced by the progressive drive of the balancing masses in the known devices, is fully avoided.
  • the masses 16 may temporarily have a larger speed than the drum, so that, when the locking members again take the position shown in FIGURE 1 as a result of the action of thes-prings 21, themasses 16 violently abut the said locking members.
  • the circular tape 24 is not rigidly secured to the peripheral wall but elastically engages the said wall, said tape will slide along the said wall as a result of the violent impact. From this it follows that the circular tape 24 which is also rotated as a result of the friction constitutes a shockabsorber against the. sudden impacts of the locking member during locking the masses 16.
  • each mass 16 includes a cavity, opening into one of the surfaces and into the periphery and which provides communication with a blind hole 26.
  • a locking member 27 arranged in the cavity is pivotal relative to the mass 16 around the pin 28.
  • the locking member includes an inertia mass 29 on one side, a cam lock 30 on the other side.
  • the cam surface 31 is biased by a tension spring 32 arrangedin the blind hole 26'.
  • the locking member 27 is held in the position shown in FIGURE 5, and a catch 33 for the cam 30 contacts a cam receiving plate 34, secured to-the circular tape 24 which is elastically secured to the peripheral wall of the water-tight chamber 12;
  • the plate 34 includes a recess 36 for receiving the catch 33 of the cam 31).
  • the mass 16 is locked with respect to the chamber 12, and is rotated synchronously by said chamber as long as the centrifugal force of the inertia mass 29 is insufficient to overcome the force of the spring 32-.
  • the characteristics of thespring and the proportions of the locking member 27 are such-that as a result of the centrifugal force the locking member 27 is displaced through an angle in the direction of the arrow 1 as a result of which the mass 16 is released'when the rotary speed of the basket 1 exceeds its critical speed.
  • this second embodiment is the same as that of the first embodiment.
  • the balancing masses 16 are held in positions located diametrically opposite to one another in such manner that they no longer influence the unbalance ofthe drum but on the contrary increase the inertia of the drum. Ifthen the critical speed of the basket is exceeded; the masses 16 are released and take such a position that they compensate for the unbalance of the basket.
  • the chambers 12 are partly filled with a viscous oil, for example, an oil which can drive the balancing masses.
  • balancing means 16 differs from two'and is, for example, three.
  • the position of the balancing masses of the same chamber could be fixed withrespect to one another by means of the same-locking device, in which the assembly of the two masses, however, could rotate freely on the shaft 2.
  • one locking device may be provided which secures the two masses 16 together, but nevertheless it is useful in general to provide a second locking device which mechanically secures the assembly of the masses, or each mass individually, to the chamber 12 to obtain a greater acceleration of the balancing masses during acceleration of the drum from washing speed to centrifuging speed.
  • the locking device releases the as sembly of the said masses preferably just before the locking: device disengages the masses 16 from one another.
  • a rotating drum, washing and centrifuging machine having" a balancing device for said rotating drum including a plurality of rotatable eccentric masses journalled on the drive shaft of said rotating drum and rotatable in an, annular path therewith, the improvement comprising: lockingmeans operative at speeds of said shaft less than a predetermined critical speed for securing said eccentric massesat predetermined positions around said drive shaft andilocating the center of'gravity of said masses along the axis. of, said drive shaft; and centrifugal force release means for disengaging said eccentric masses when said drumrotates at said critical speed.
  • said locking means comprises a pivotal locking member mounted on each of said rotatable eccentric masses, a tape attached to said rotatable drum and concentricaly surrounding said path of movement of said rotatable eccentric masses, said tape having a catch thereon for receiving said locking member, and biasing means forcing said locking member into engagement with said catch; and said centrifugal force release means comprises an inertial weight attached to said pivotal locking member for counteracting said biasing means when said rotating drum attains said critical speed thereby releasing said locking member from said catch.
  • said locking means comprises a tape engaging said rotatable drum and rotating therewith, said tape being positioned outside and concentric to the annular path of movement of said rotatable eccentric masses and a radially movable cam means attached to said tape for engaging said rotatable eccentric masses; and said centrifugal force release means comprises a spring means interconnecting said cam means and said tape, said spring means applying a biasing force to said cam means for lockingly engaging said cam means with said rotatable eccentric masses, said biasing force being counteracted by the centrifugal force created by said drum rotating at said critical speed thereby releasing said eccentric masses from said locking engagement with said cam means.
  • said eccentric masses comprise a pair of semicircular segments rotatably mounted in axial spaced relation on said drive shaft, said axis of said drive shaft passing through the geometric center of the circle which defines said semicircle; said tape is annularly shaped and concentrically surrounds the circular face of said semicircular segments; said cam means comprises two pair of cam elements, each of said pairs of cam elements being axially spaced on said drive shaft, with each of said cam elements of said pair being in diametrically opposed relationship and engaging one of the radial faces of each of said semicircular segments for holding said radial faces of each of said semicircular segments in parallel alignment; and said spring means comprises four leaf springs, each of said leaf springs biasingly interconnecting one of said cam elements with said annular tape.
  • said locking means comprises a pivotal locking member mounted on each of said rotatable eccentric masses, a tape attached to said rotatable drum and concentrically surrounding said path of movement of said rotatable eccentric masses, said tape having a catch thereon for receiving said locking member, and biasing means forcing said locking member into engagement with said catch; and said centrifugal force release means comprises an inertial weight attached to said pivotal locking member for counteracting said biasing means when said rotating drum attains said critical speed thereby releasing said locking member from said catch.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Laminated Bodies (AREA)
  • Centrifugal Separators (AREA)
US538304A 1965-04-20 1966-03-29 Locking and release mechanism for a washing machine balancing device Expired - Lifetime US3356222A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH547565A CH440197A (fr) 1965-04-20 1965-04-20 Machine à laver et à essorer le linge munie d'un dispositif d'équilibrage

Publications (1)

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US3356222A true US3356222A (en) 1967-12-05

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US538304A Expired - Lifetime US3356222A (en) 1965-04-20 1966-03-29 Locking and release mechanism for a washing machine balancing device

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US (1) US3356222A (enrdf_load_html_response)
AT (1) AT262207B (enrdf_load_html_response)
BE (1) BE679687A (enrdf_load_html_response)
CH (1) CH440197A (enrdf_load_html_response)
DE (1) DE1585696A1 (enrdf_load_html_response)
DK (1) DK109382C (enrdf_load_html_response)
ES (1) ES325630A1 (enrdf_load_html_response)
GB (1) GB1092188A (enrdf_load_html_response)
NL (1) NL6604958A (enrdf_load_html_response)
NO (1) NO116413B (enrdf_load_html_response)
SE (1) SE323348B (enrdf_load_html_response)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040123631A1 (en) * 2002-12-27 2004-07-01 Jae-Won Chang Drum type washing machine
US20050144736A1 (en) * 2002-05-22 2005-07-07 Jones David M. Automatic balancing device
US20060016228A1 (en) * 2004-07-20 2006-01-26 Lg Electronics Inc. Drum type washing machine and bearing housing structure thereof
US20060053838A1 (en) * 2004-09-13 2006-03-16 Matsushita Electric Industrial Co., Ltd. Drum type washing machine
US7039976B2 (en) * 2002-04-09 2006-05-09 Maytag Corporation Braking control system for a washing machine
US20080034917A1 (en) * 2004-11-17 2008-02-14 Dyson Technolohy Limited Automatic Balancing Device
US7827834B2 (en) 2005-09-30 2010-11-09 Lg Electronics Inc. Bearing housing assembly of drum-type washing machine and drum-type washing machine with the same
US7841220B2 (en) 2005-09-30 2010-11-30 Lg Electronics Inc. Drum-type washing machine
US8087267B2 (en) 2002-12-27 2012-01-03 Lg Electronics Inc. Drum type washing machine
USRE43625E1 (en) 2006-03-29 2012-09-04 Lg Electronics Inc. Drum type washing machine
CN112030458A (zh) * 2019-06-03 2020-12-04 青岛海尔滚筒洗衣机有限公司 一种双滚筒洗衣机
CN114059296A (zh) * 2020-07-30 2022-02-18 广东美的白色家电技术创新中心有限公司 平衡组件及家用电器
US11261556B2 (en) * 2017-08-04 2022-03-01 Qingdao Haier Washing Machine Co., Ltd. Washing machine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0211706D0 (en) * 2002-05-22 2002-07-03 Dyson Ltd Automatic balancing device
WO2010105313A1 (en) * 2009-03-20 2010-09-23 Safedin Zelic Inertial auto balancing mechanism
DE102017219050A1 (de) 2017-10-25 2019-04-25 BSH Hausgeräte GmbH Wäschetrommelanordnung
CN113265835B (zh) * 2021-05-27 2022-11-15 海信冰箱有限公司 一种洗衣机脱水控制方法、装置及洗衣机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3178916A (en) * 1962-02-26 1965-04-20 Frame Machine for washing and centrifuging textile

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3178916A (en) * 1962-02-26 1965-04-20 Frame Machine for washing and centrifuging textile

Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7039976B2 (en) * 2002-04-09 2006-05-09 Maytag Corporation Braking control system for a washing machine
US20050144736A1 (en) * 2002-05-22 2005-07-07 Jones David M. Automatic balancing device
US7509825B2 (en) * 2002-05-22 2009-03-31 Dyson Technology Limited Automatic balancing device
US8646293B2 (en) 2002-12-27 2014-02-11 Lg Electronics Inc. Drum type washing machine
US7930910B2 (en) 2002-12-27 2011-04-26 Lg Electronics Inc. Drum type washing machine
US20060243003A1 (en) * 2002-12-27 2006-11-02 Jae-Won Chang Drum type washing machine
US8887537B2 (en) 2002-12-27 2014-11-18 Lg Electronics Inc. Drum-type washing machine
US8671719B2 (en) 2002-12-27 2014-03-18 Lg Electronics Inc. Drum type washing machine
US20040123631A1 (en) * 2002-12-27 2004-07-01 Jae-Won Chang Drum type washing machine
US8646292B2 (en) 2002-12-27 2014-02-11 Lg Electronics Inc. Drum type washing machine
US7533548B2 (en) 2002-12-27 2009-05-19 Lg Electronics Inc. Drum type washing machine
US8341983B2 (en) 2002-12-27 2013-01-01 Lg Electronics Inc. Drum-type washing machine
US7571625B2 (en) 2002-12-27 2009-08-11 Lg Electronics Inc. Drum type washing machine
US8387421B2 (en) 2002-12-27 2013-03-05 Lg Electronics Inc. Drum-type washing machine
US8616027B2 (en) 2002-12-27 2013-12-31 Lg Electronics Inc. Drum type washing machine
US8336339B2 (en) 2002-12-27 2012-12-25 Lg Electronics Inc. Drum type washing machine
US8087267B2 (en) 2002-12-27 2012-01-03 Lg Electronics Inc. Drum type washing machine
US8156770B2 (en) 2002-12-27 2012-04-17 Lg Electronics, Inc. Drum type washing machine
US8336340B2 (en) 2002-12-27 2012-12-25 Lg Electronics Inc. Drum-type washing machine
US8322170B2 (en) 2002-12-27 2012-12-04 Lg Electronics Inc. Drum-type washing machine
US8302434B2 (en) 2002-12-27 2012-11-06 Lg Electronics Inc. Drum-type washing machine
US20060016228A1 (en) * 2004-07-20 2006-01-26 Lg Electronics Inc. Drum type washing machine and bearing housing structure thereof
US8677787B2 (en) 2004-07-20 2014-03-25 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US8931312B2 (en) 2004-07-20 2015-01-13 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US8887538B2 (en) 2004-07-20 2014-11-18 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US20070017261A1 (en) * 2004-07-20 2007-01-25 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US8800326B2 (en) 2004-07-20 2014-08-12 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US7568366B2 (en) * 2004-07-20 2009-08-04 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US8726702B2 (en) 2004-07-20 2014-05-20 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US8783072B2 (en) 2004-07-20 2014-07-22 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US8429938B2 (en) 2004-07-20 2013-04-30 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US8434334B2 (en) 2004-07-20 2013-05-07 Lg Electronics Inc. Drum-type washing machine and bearing housing structure thereof
US7530244B2 (en) * 2004-09-13 2009-05-12 Matsushita Electric Industrial Co., Ltd. Drum type washing machine
US20060053838A1 (en) * 2004-09-13 2006-03-16 Matsushita Electric Industrial Co., Ltd. Drum type washing machine
US8286531B2 (en) * 2004-11-17 2012-10-16 Dyson Technology Limited Automatic balancing device
US20080034917A1 (en) * 2004-11-17 2008-02-14 Dyson Technolohy Limited Automatic Balancing Device
US7841220B2 (en) 2005-09-30 2010-11-30 Lg Electronics Inc. Drum-type washing machine
US8234890B2 (en) 2005-09-30 2012-08-07 Lg Electronics Inc. Drum-type washing machine
US8225628B2 (en) 2005-09-30 2012-07-24 Lg Electronics Inc. Drum-type washing machine
US8671718B2 (en) 2005-09-30 2014-03-18 Lg Electronics Inc. Drum-type washing machine
US7827834B2 (en) 2005-09-30 2010-11-09 Lg Electronics Inc. Bearing housing assembly of drum-type washing machine and drum-type washing machine with the same
US8220294B2 (en) 2005-09-30 2012-07-17 Lg Electronics Inc. Drum-type washing machine
USRE44511E1 (en) 2006-03-29 2013-10-01 Lg Electronics Inc. Drum type washing machine
USRE44028E1 (en) 2006-03-29 2013-02-26 Lg Electronics Inc. Drum type washing machine
USRE44674E1 (en) 2006-03-29 2013-12-31 Lg Electronics Inc. Drum type washing machine
USRE44795E1 (en) 2006-03-29 2014-03-11 Lg Electronics Inc. Drum type washing machine
USRE43625E1 (en) 2006-03-29 2012-09-04 Lg Electronics Inc. Drum type washing machine
US11261556B2 (en) * 2017-08-04 2022-03-01 Qingdao Haier Washing Machine Co., Ltd. Washing machine
CN112030458A (zh) * 2019-06-03 2020-12-04 青岛海尔滚筒洗衣机有限公司 一种双滚筒洗衣机
CN114059296A (zh) * 2020-07-30 2022-02-18 广东美的白色家电技术创新中心有限公司 平衡组件及家用电器

Also Published As

Publication number Publication date
NL6604958A (enrdf_load_html_response) 1966-10-21
DE1585696A1 (de) 1970-10-15
DK109382C (da) 1968-04-22
CH440197A (fr) 1967-07-31
GB1092188A (en) 1967-11-22
ES325630A1 (es) 1967-06-16
SE323348B (enrdf_load_html_response) 1970-05-04
NO116413B (enrdf_load_html_response) 1969-03-24
BE679687A (enrdf_load_html_response) 1966-10-18
AT262207B (de) 1968-06-10

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