US2957959A - Unbalance switch for centrifugal extractors - Google Patents

Unbalance switch for centrifugal extractors Download PDF

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US2957959A
US2957959A US838113A US83811359A US2957959A US 2957959 A US2957959 A US 2957959A US 838113 A US838113 A US 838113A US 83811359 A US83811359 A US 83811359A US 2957959 A US2957959 A US 2957959A
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base member
switch
plunger
lid
switch means
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US838113A
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John C Mellinger
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Maytag Corp
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Maytag Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/14—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch
    • H01H35/144—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch operated by vibration
    • 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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/48—Preventing or reducing imbalance or noise
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/20—Interlocking, locking, or latching mechanisms
    • H01H9/22—Interlocking, locking, or latching mechanisms for interlocking between casing, cover, or protective shutter and mechanism for operating contacts
    • H01H9/226—Interlocking, locking, or latching mechanisms for interlocking between casing, cover, or protective shutter and mechanism for operating contacts the casing containing electrical equipment other than and operated by the switch

Definitions

  • This invention relates to a control mechanism for stopping and restarting electrically controlled devices, and, more particularly, to ⁇ an unbalance switch for centrifugal extractors.
  • Unbalance switches have been designed for centrifugal extractors, such ⁇ as in washing machines operable through wash and spin-dry cycles. During the spin-dry operations, if an extreme unbalance condition occurs due to the uneven distribution of clothes, the tub may gyrate violently. Unbalance switches are designed generally to open the circuit controlling the appliance, so that the machine is de-energized. The operator can then redistribute the clothes and restart the operation.
  • lt is a further object of the invention to maintain an electrically controlled device in ⁇ de-energized condition after shut off due to unbalance conditions until restarted by the operator.
  • 1t is a still further object of the invention to provide la control mechanism that is automatically reset upon opening of the lid after the machine has been de-energized.
  • a switch control that serves to function both as a door interlock and as an unbalance switch which can be reset upon the opening of the door, as when the operator redistributes the clothes to remedy the conditions which cause the unbalance.
  • Figure 1 is a fragmentary top plan view of a washing machine, in which the top wall or" the cabinet is- ⁇ broken away to show the control mechanism of the invention
  • Figure 2 is an enlarged fragmentary view taken substantially along lines 2-2 of Figure l;
  • Figure 3 is a view similar to Figure 2 illustrating the action of the control mechanism during conditions of unbalance.
  • Figure 4 is a sectional view taken substantially along lines 4-4 of Figure 2.
  • centrifugal extractor 1t such as employed in an upright clothes washing machine, which includes a tub 11 within which is journalled a clothes basket 12. The entire washing machine is supported on a frame and enclosed in a cabinet 14.
  • the access opening to the clothes basket 12 may be closed by a lid 15.
  • the lid is pivoted about 16, the latl' 2,957,959 Patented Oct. 25, 1960 ter of which is spaced a short distance from one end 17 of the lid, so that the end 17 functions as a lever to engage the plunger end 21 and move the plunger 20 to operate the control mechanism.
  • Bracket 22 is substantially channel shaped in cross section having a depending front ange 23 which is secured by screws 24 to the cabinet 14 of the appliance.
  • the rear flange 25 is fastened to a cabinet crossmember 18 by screws 26.
  • Plunger 20 projects through an opening 27 in the rear ange 25.
  • a base member 3i) is pivotally mounted in a recess formed in the bracket 22, so that it may be moved between two positions, illustrated respectively in Figures 2 and 3.
  • Spring 33 is connected between an upright post 34 on the base member and a leg member 35 on the bracket 22 to maintain the base member normally in the position illustrated in Figure 2.
  • a switch 38 is supported on a platform 37 of the base member.
  • Switch 38 has a spring biased button 40 for opening and closing electrical switch contacts.
  • button 40 When the base member is maintained in its normal position by the spring 33, button 40 is aligned with, and adjacent to, the plunger 20, so that it may be engaged thereby when the plunger is moved rearwardly by the closing action of the lid 15.
  • the wire leads 41 of the switch 38 may bo connected in series with the circuit for energizing the washing in order that the machine may be tie-energized, or energized by switch 38.
  • button 40 is depressed by the plunger 20 as the lid 15 is closed, plunger 20 is moved rearwardly, and switch contacts in switch 38 are closed to permit the machine to be operated.
  • button 40 is permitted to move outwardly to open the switch contacts of switch 38 to de-energize the electrical circuit.
  • a latch 45 maintains the base member 3l) in the tilted position of Figure 3 until released.
  • the latch includes a sleeve 46 slidably mounted on plunger 20, a depending leg 44, and a keeper 47.
  • the keeper is in the form of a shoulder 47 above the base member 30 adapted to project through opening 48 in the arm member 42, and engage the lower surface of the base member 30 when the latter is lifted by the bumper 43 during conditions of unbalance, as shown in - Figure 3.
  • Spring 49 between flange 23 and sleeve 46 biases the latch toward the base member 30, so that the keeper immediately snaps through the opening 48 as the arm 42 is lifted.
  • the keeper ordinarily is prevented from entering the opening 48, except during a condition of unbalance, by a stop, or ledge 50 at the end of keeper 47 which abuts the end of the base member 30.
  • a stop 52 in the form of a finger projects through the opening 48 to support the base member 30.
  • Spring in a counter-clockwise direction.
  • the base member in the normal position is supported on the stop 52, the latter of which, however, permits clockwise rotation of the base member to the tilted position illustrated in Figure 3.
  • a return spring 54 is mounted between the flange 25 of bracket 22 and a pin 56 aiiixed to the plunger 20. Compression of spring 54 biases the plunger in theV direction of the lid 15, so that, when the latter is raised, the plunger end 21 is projected through the opening 29 in the cabinet 14. Washer 57 may be interposed between the spring and pin 56.
  • a stop in the form of a boss 58 on plunger 20 on the opposite side of flange 25 prevents the plunger from being ejected through the opening 27 of the cabinet when the lid is lifted.
  • pin 56 is separated from sleeve "46 of the latch. This spacing permits freedom of movement of the latch to engage the base member in tilted position, as discussed above.
  • sleeve 46 is adjacent pin 56, and adapted to be contacted thereby when the lid is raised.
  • Return spring 54 is stronger than the latch spring 49, so that the latter is overcome by the former when the lid is opened. Since spring 54 is more powerful than spring 49, the latch ⁇ 45 is moved from right to left as shown in the drawings by pin 56 pushing sleeve 46 against spring 49. Thus, assuming keeper 47 has been inserted through opening ⁇ 48 to maintain the base member 30 in a tilted position as shown in Figure 3, upon opening the lid 15, return spring 54, by virtue of its greater strength, forces the sleeve 46 against spring 49 from right to left, thereby withdrawing the keeper from the opening y48 of arm 42, while plunger is moved, at the same time, to project end 21 through the opening 29 of the cabinet.
  • bumper K43 engages the arm 42, base member 30 and platform 37 are tilted rearwardly, and the switch 38 rotated in a direction away from the plunger 20. This permits the switch button 40 to be released opening the contacts of the switch 38 to stop the machine.
  • latch spring 49 biases the keeper 47 through opening ⁇ 48 to maintain the base member in the tilted position, shown in Figure 3. Switch 38 remains in this position with the base member supported by latch 45 and the machine kept de-energized until the control mechanism is reset.
  • the control is reset by opening the lid 15. This releases the end 21 of the plunger 20, so that the return spring 54 moves the latch 45, as well as plunger 20, from right to left and keeper is withdrawn from the opening 48 by pin 56 engaging sleeve 46.
  • the platform is returned to the normal position by spring 33, as shown in Figure 2, with the base member resting yon finger 52.
  • the control having been rmet by opening the lid 15, the machine is again energized by closing the lid, as previously described.
  • the combination comprising, a base member pivotably mounted for movements between first and second positions, switch means mounted on said base member, means biasing said base member to the iirst position, follower means movably mounted for engaging and holding said switch means in closed position when said base member is in the iirst position, and an arm member on said base member for pivoting said base member to the second position under predetermined conditions for disengaging said switch means from said follower means.
  • the combination comprising, a base member pivotably mounted for movements between iirst and second positions, switch means mounted on said base member, means for normally maintaining said base member in the iirst position, follower means movably mounted for engaging and holding said switch means in closed position when said base member is in the iirst position, an arm member on said base member for pivoting said base member to the second position under predetermined conditions for disengaging said switch means from said follower means, and means for keeping said base member in the second position after occurrence of the predetermined condition until released.
  • the combination comprising, a base member pivotably mounted for movements between rst and second positions, switch means mounted on said base member, means biasing said base member to the irst position, follower means movably mounted for engaging and holding said switch means in closed position when said base member is in the lirst position, an arm member on said base member for pivoting said base member to the second poistion under predetermined conditions for disengaging said switch means from said follower means, and latch means for keeping said base member in the second position after such occurrence of predetermined conditions until released.
  • the combination comprising, -a base member pivotably mounted for movements between first and second positions, switchrneans mounted on said base member, spring means biasing said base member to the first position, follower means movably mounted on said support member for engaging :and holding said switch means in closed position when said base member is in the rst position, an arm member on said base member for pivot- -ing said base member to a second position under predetermined conditions for disengaging said switch means from said follower means, and releasable latch means for keeping said base member in the second position against the bias of said spring means after such occurrence of predetermined conditions until released.
  • the combination comprising, a base member pivotably mounted for movements between first :and second positions, switch means mounted on said base member, means biasing said base member to the first position, follower means movably mounted for engaging and holding said switch means in closed position when said base member is in the iirst position, an arm member on said base member for pivoting said base member to the second position under predetermined conditions to disengage said switch means from said follower means, and spring biased latch means for keeping said base member in the second position after such occurrence of predetermined conditions until released, and means associated with said follower means for releasing said spring biased latch means.
  • a device of the character described comprising, a pivotally mounted base member, switch means secured to said base member, follower means movably mounted for engaging and holding said switch means in closed position, an arm member on said base member adapted to be moved under predetermined conditions for pivoting said base member in one direction for disengaging said switch means from said follower means, means biasing said base member in the opposite direction, and latch means associated with said arm member for keeping said base member in pivoted position in which said switch means is disengaged from said follower means until released.
  • a support member a pivotally mounted base member, switch means secured to said base member, follower means movably mounted for engaging and holding said switch means in closed position, an arm member on said base member for pivoting said base member in one direction under predetermined conditions to disengage said switch means from said follower means, means biasing said base member in the opposite direction, latch means associated with said arm member for keeping said base member in pivoted position in which said switch means is disengaged from said follower means, and means for releasing said latch means.
  • a frame a lid member for the extractor mounted on said frame for opening and closing movements, a base member pivotably mounted for movements between first and second positions, means biasing said base member to the first position, switch means for controlling the extractor mounted on said base member, follower means movably mounted between said lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed and when said base member is in the first position, an arm member on said base member adapted to be engaged by the centrifugal extractor during conditions of unbalance to pivot said base member to the second position for disengaging said switch means from said follower means, and releasable means for keeping said base member in the second position.
  • a frame a lid member for the extractor mounted on said frame for opening and closing movements, a base member pivotably mounted for movements between rst and second positions, spring means for biasing said base member to the first position, switch means for controlling the extractor mounted on said base member, follower means movably mounted on said support member between said lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed and when said base member is in the first position, ⁇ an arm member on said base member adapted to be engaged by the centrifugal extractor during conditions o-f unbalance rto pivot said base member to the second position for disengaging said switch means from said follower means, latch means for keeping said base member against the bias of said spring means in the second position until released, and means for releasing said latch means when said lid member is opened.
  • a frame In an electrically controlled centrifugal extractor, a frame, a lid member for the extractor mounted on said frame for opening and closing movements, a base member pivotably mounted for movements between first and second positions, means biasing said base member to the rst position, switch means for controlling the extractor mounted on said base member, follower means movably mounted on said support member between said lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed and when said base member is in Ithe rst 6 position, an arm member on said base member adapted to be engaged by the centrifugal extractor Vduring conditions of unbalance for pivoting said base member to the second position to disengage said switch means from said follower means, latch means for keeping said base member in the second position until released, Iand means operatively associated with said -follower means for releasing said latch means when said lid member is opened.
  • a frame In an electrically controlled centrifugal extractor, a frame, a lid member mounted on said frame for opening ⁇ and closing movements, a base member pivotally mounted for movements between rst and second positions, switch means for controlling said extractor mounted on said base member, a plunger movably mounted between said lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed, means biasing said base member to the first position in which said switch means is operatively engaged by said plunger, means for pivoting said base member to the second position away from said plunger to disengage said switch means under predetermined conditions, latch means for keeping sa-id base member in the second position until released, a trip member on said plunger for releasing said latter means, and spring means biasing said trip member to release said latch member when said lid member is opened.
  • a frame In an electrically controlled centrifugal extractor, a frame, a lid member mounted on said frame for opening and closing movements, a base member pivotally mounted for movements between rst and second positions, switch means for controlling said extractor mounted on said base member, ⁇ a plunger movably mounted between said lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed, means biasing said base member to the first position in which said switch means is operatively engaged by said plunger, means for pivoting said base member to the second position Iaway from said plunger -to disengage said switch means under predetermined conditions, spring biased latch means for keeping said base member in the second position until released, and la member on said plunger for releasing said latter means when said lid member is opened.
  • a frame In an electrically controlled centrifugal extractor, a frame, a lid member mounted on said frame for opening and closing movements, a base member pivotally mounted for movements between iirst and second positions, switch means for controlling said extractor mounted on said base member, -a plunger operatively associated with said lid member movably mounted for engaging and holding said switch means in closed position when said lid member is closed, means biasing said base member to the rst position in which said switch means is operatively engaged by said plunger, means for pivoting said base member lto the second position away from said plunger to disengage said switch means under predetermined conditions, latch means for keeping said base member in the second position until released, and means operatively associated with said plunger for releasing said latter means when the lid member is opened.
  • a frame In an electrically controlled centrifugal extractor, a frame, a lid member mounted on said frame for opening and closing movements, a base member pivotally mounted for movements between first and second positions, switch means for controlling said extractor mounted on said base member, a plunger movably mounted between said lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed, means biasing said base member to the rst position in which said switch means is operatively engaged by said plunger, means for pivoting said base member to the second position away from said plunger to disengage said switch means under predetermined conditions, means for keeping said base member in the second position until released, and means for releasing said latter means when the lid member is opened. 15.
  • a frame In an electrically controlled centrifugal extractor, a frame, a lid member mounted on said frame -or opening and closing movements, a base member pivotally mounted for movements between tirst and second positions, switch means for controlling said extractor mounted on said base member, ⁇ a plunger movably mounted between said -lid member and switch means for engaging and holding said switch means in closed position when said ylid member is closed, means biasing said base member to the iirst position in which said switch means is operatively engaged by said plunger, means for pivoting said base member to the second position away from said plunger to disengage said switch means under predetermined conditions, and releasable means for keeping said base member in the second position.
  • a trarne a lid member mounted on said frame for opening and closing movements, a .base member pivotally mounted for movements between rst and second positions, switch means for controlling said extractor mounted on said base member, a plunger movably mounted between said -lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed, means biasing said base member to the rst position in which said switch means is operatively engaged by said plunger, means for pivoting said base member to the second position away from said plunger to disengage said switch means under predetermined conditions, and releasable spring biased latch means for keeping said base member in the second position.

Description

Oct. 25, 1960 J. c. MELLINGER UNBALANCE SWITCH Foa CENTRIFUGAL ExTRAcToRs Filed Sept. 4, 1959 2 Sheets-Sheet 1 dnvznlor John c Oct. 25, 196() J. c. MELLINGER UNBALANCE SWITCH FOR CENTRIFUGAL EXTRACTORS 2 Sheets-Sheet 2 Filed Sept. 4, 1959 IVI/Er e111' n et gen? UNBALANCE SWITCH FOR CENTRIFUGAL EXTRACTORS John C. Mellinger, Newton, Iowa, assignor to The Maytag Company, Newton, Iowa, a corporation of Delaware Filed Sept. 4, 1959, Ser. No. 838,113
16 Claims. (Cl. ZOU-61.76)
This invention relates to a control mechanism for stopping and restarting electrically controlled devices, and, more particularly, to `an unbalance switch for centrifugal extractors.
Many different types of unbalance switches have been designed for centrifugal extractors, such `as in washing machines operable through wash and spin-dry cycles. During the spin-dry operations, if an extreme unbalance condition occurs due to the uneven distribution of clothes, the tub may gyrate violently. Unbalance switches are designed generally to open the circuit controlling the appliance, so that the machine is de-energized. The operator can then redistribute the clothes and restart the operation.
It is an object of the present invention to provide an unbalance switch that will de-energize an electrically controlled device during predetermined conditions. lt is a further object of the invention to maintain an electrically controlled device in`de-energized condition after shut off due to unbalance conditions until restarted by the operator. 1t is a still further object of the invention to provide la control mechanism that is automatically reset upon opening of the lid after the machine has been de-energized. It is another object of the invention to provide a switch control that serves to function both as a door interlock and as an unbalance switch which can be reset upon the opening of the door, as when the operator redistributes the clothes to remedy the conditions which cause the unbalance. It is still another object of the invention to provide an unbalance control mechanism that is positive and reliable in operation. It is yet another object of the invention to provide a control device that is inexpensive in manufacture because of its simple arrangement. Further objects and advantages of this invention will become evident as the .description proceeds and from an examination of the accompanying drawings which illustrate one embodiment of the invention and in which simi-lar numerals refer to simil-ar parts throughout the several views.
In the drawings:
Figure 1 is a fragmentary top plan view of a washing machine, in which the top wall or" the cabinet is-` broken away to show the control mechanism of the invention;
Figure 2 is an enlarged fragmentary view taken substantially along lines 2-2 of Figure l;
Figure 3 is a view similar to Figure 2 illustrating the action of the control mechanism during conditions of unbalance; and
Figure 4 is a sectional view taken substantially along lines 4-4 of Figure 2.
Referring now to the drawings, there is shown a centrifugal extractor 1t), such as employed in an upright clothes washing machine, which includes a tub 11 within which is journalled a clothes basket 12. The entire washing machine is supported on a frame and enclosed in a cabinet 14.
The access opening to the clothes basket 12 may be closed by a lid 15. The lid is pivoted about 16, the latl' 2,957,959 Patented Oct. 25, 1960 ter of which is spaced a short distance from one end 17 of the lid, so that the end 17 functions as a lever to engage the plunger end 21 and move the plunger 20 to operate the control mechanism.
The plunger, or follower, 20 is slidably mounted in a bracket 22. Bracket 22 is substantially channel shaped in cross section having a depending front ange 23 which is secured by screws 24 to the cabinet 14 of the appliance. The rear flange 25 is fastened to a cabinet crossmember 18 by screws 26.
Plunger 20 projects through an opening 27 in the rear ange 25. The plunger end 21, which engages lid 15, protrudes through the opening 28 of front flange 23 and opening 29 of cabinet 14.
A base member 3i) is pivotally mounted in a recess formed in the bracket 22, so that it may be moved between two positions, illustrated respectively in Figures 2 and 3. Spring 33 is connected between an upright post 34 on the base member and a leg member 35 on the bracket 22 to maintain the base member normally in the position illustrated in Figure 2.
A switch 38 is supported on a platform 37 of the base member. Switch 38 has a spring biased button 40 for opening and closing electrical switch contacts. When the base member is maintained in its normal position by the spring 33, button 40 is aligned with, and adjacent to, the plunger 20, so that it may be engaged thereby when the plunger is moved rearwardly by the closing action of the lid 15. The wire leads 41 of the switch 38 may bo connected in series with the circuit for energizing the washing in order that the machine may be tie-energized, or energized by switch 38. When button 40 is depressed by the plunger 20 as the lid 15 is closed, plunger 20 is moved rearwardly, and switch contacts in switch 38 are closed to permit the machine to be operated. On the other hand, when the lid 15 is opened as shown in the dotted line position in Figure 2, button 40 is permitted to move outwardly to open the switch contacts of switch 38 to de-energize the electrical circuit.
Depending arm 42 connected to the base member 30 is located in `a position to be cont-acted by bumper 43 affixed to the tub 11, when the tub is gyrating excessively, `due to unbalance conditions wihtin the basket 12. Thus, if the tub 11 nutates violently because of the uneven distribution of clothes in the basket 12, bumper 43 contacts arm 42 of the base member 3l), as shown in Figure 3, to pivot the base member to a tiited position against the tension of spring 33. It will be noted that in tilted position, switch 38 is moved rearwardly away from plunger 20, to release button 40 'and open the switch contacts of switch 38, and thus, de-energize the machine.
A latch 45 maintains the base member 3l) in the tilted position of Figure 3 until released. In the particular form shown in the drawings, the latch includes a sleeve 46 slidably mounted on plunger 20, a depending leg 44, and a keeper 47. The keeper is in the form of a shoulder 47 above the base member 30 adapted to project through opening 48 in the arm member 42, and engage the lower surface of the base member 30 when the latter is lifted by the bumper 43 during conditions of unbalance, as shown in -Figure 3. Spring 49 between flange 23 and sleeve 46 biases the latch toward the base member 30, so that the keeper immediately snaps through the opening 48 as the arm 42 is lifted. The keeper ordinarily is prevented from entering the opening 48, except during a condition of unbalance, by a stop, or ledge 50 at the end of keeper 47 which abuts the end of the base member 30.
A stop 52 in the form of a finger projects through the opening 48 to support the base member 30. Spring in a counter-clockwise direction. However, the base member in the normal position is supported on the stop 52, the latter of which, however, permits clockwise rotation of the base member to the tilted position illustrated in Figure 3.
A return spring 54 is mounted between the flange 25 of bracket 22 and a pin 56 aiiixed to the plunger 20. Compression of spring 54 biases the plunger in theV direction of the lid 15, so that, when the latter is raised, the plunger end 21 is projected through the opening 29 in the cabinet 14. Washer 57 may be interposed between the spring and pin 56.
A stop in the form of a boss 58 on plunger 20 on the opposite side of flange 25 prevents the plunger from being ejected through the opening 27 of the cabinet when the lid is lifted.
It will be noted that when the plunger is moved by the lid to depress switch button 4t?, pin 56 is separated from sleeve "46 of the latch. This spacing permits freedom of movement of the latch to engage the base member in tilted position, as discussed above. However, when the keeper is engaged, as in Figure 3, sleeve 46 is adjacent pin 56, and adapted to be contacted thereby when the lid is raised.
Return spring 54 is stronger than the latch spring 49, so that the latter is overcome by the former when the lid is opened. Since spring 54 is more powerful than spring 49, the latch `45 is moved from right to left as shown in the drawings by pin 56 pushing sleeve 46 against spring 49. Thus, assuming keeper 47 has been inserted through opening `48 to maintain the base member 30 in a tilted position as shown in Figure 3, upon opening the lid 15, return spring 54, by virtue of its greater strength, forces the sleeve 46 against spring 49 from right to left, thereby withdrawing the keeper from the opening y48 of arm 42, while plunger is moved, at the same time, to project end 21 through the opening 29 of the cabinet.
From the foregoing description, it is believed that the operation of the control mechanism of the invention is apparent. When the operator raises lid of the washer, for instance, to insert clothes, as shown by the dotted lines in Figure 2, the plunger 2t) is moved from right to left by the return spring 54 to release the switch button 40, open the switch contacts of switch 38, and de-energize the machine. However, when the lid 15 is closed, the lever end 17 of the door engages plunger end 21 to move the plunger from left to right, depress the switch button 40 and close the switch contacts of switch 38, and energize the electrically controlled appliance. If a condition of unbalance should occur during operation in which the tub 11 gyrates eX- cessively, then bumper K43 engages the arm 42, base member 30 and platform 37 are tilted rearwardly, and the switch 38 rotated in a direction away from the plunger 20. This permits the switch button 40 to be released opening the contacts of the switch 38 to stop the machine. At the same time, latch spring 49 biases the keeper 47 through opening `48 to maintain the base member in the tilted position, shown in Figure 3. Switch 38 remains in this position with the base member supported by latch 45 and the machine kept de-energized until the control mechanism is reset.
The control is reset by opening the lid 15. This releases the end 21 of the plunger 20, so that the return spring 54 moves the latch 45, as well as plunger 20, from right to left and keeper is withdrawn from the opening 48 by pin 56 engaging sleeve 46. The platform is returned to the normal position by spring 33, as shown in Figure 2, with the base member resting yon finger 52.
The control having been rmet by opening the lid 15, the machine is again energized by closing the lid, as previously described.
In practice, if the operator observes that the machine has been stopped during the centrifugal extraction operation, it is only necessary to lift the lid 15 and close it again to restart the machine. This is a convenient operation, since the procedure is ordinarily followed in order to manually redistribute the clothes within the basket to eliminate the conditions causing unbalance.
In the drawings and specification there has been set forth a preferred embodiment of the invention, and although speciiic terms are employed, these are used in a generic and descriptive sense only, and not for purposes of limitation. Changes in form and the proportion of parts, as well as the substitution of equivalents are contemplated, as circumstances may suggest or render expedient, without departing from the spirit or scope of this invention as further defined in the following claims.
l claim:
l. The combination comprising, a base member pivotably mounted for movements between first and second positions, switch means mounted on said base member, means biasing said base member to the iirst position, follower means movably mounted for engaging and holding said switch means in closed position when said base member is in the iirst position, and an arm member on said base member for pivoting said base member to the second position under predetermined conditions for disengaging said switch means from said follower means.
2. The combination comprising, a base member pivotably mounted for movements between iirst and second positions, switch means mounted on said base member, means for normally maintaining said base member in the iirst position, follower means movably mounted for engaging and holding said switch means in closed position when said base member is in the iirst position, an arm member on said base member for pivoting said base member to the second position under predetermined conditions for disengaging said switch means from said follower means, and means for keeping said base member in the second position after occurrence of the predetermined condition until released.
3. The combination comprising, a base member pivotably mounted for movements between rst and second positions, switch means mounted on said base member, means biasing said base member to the irst position, follower means movably mounted for engaging and holding said switch means in closed position when said base member is in the lirst position, an arm member on said base member for pivoting said base member to the second poistion under predetermined conditions for disengaging said switch means from said follower means, and latch means for keeping said base member in the second position after such occurrence of predetermined conditions until released.
4. The combination comprising, -a base member pivotably mounted for movements between first and second positions, switchrneans mounted on said base member, spring means biasing said base member to the first position, follower means movably mounted on said support member for engaging :and holding said switch means in closed position when said base member is in the rst position, an arm member on said base member for pivot- -ing said base member to a second position under predetermined conditions for disengaging said switch means from said follower means, and releasable latch means for keeping said base member in the second position against the bias of said spring means after such occurrence of predetermined conditions until released.
`5. The combination comprising, a base member pivotably mounted for movements between first :and second positions, switch means mounted on said base member, means biasing said base member to the first position, follower means movably mounted for engaging and holding said switch means in closed position when said base member is in the iirst position, an arm member on said base member for pivoting said base member to the second position under predetermined conditions to disengage said switch means from said follower means, and spring biased latch means for keeping said base member in the second position after such occurrence of predetermined conditions until released, and means associated with said follower means for releasing said spring biased latch means.
6. A device of the character described comprising, a pivotally mounted base member, switch means secured to said base member, follower means movably mounted for engaging and holding said switch means in closed position, an arm member on said base member adapted to be moved under predetermined conditions for pivoting said base member in one direction for disengaging said switch means from said follower means, means biasing said base member in the opposite direction, and latch means associated with said arm member for keeping said base member in pivoted position in which said switch means is disengaged from said follower means until released.
7. In combination: a support member, a pivotally mounted base member, switch means secured to said base member, follower means movably mounted for engaging and holding said switch means in closed position, an arm member on said base member for pivoting said base member in one direction under predetermined conditions to disengage said switch means from said follower means, means biasing said base member in the opposite direction, latch means associated with said arm member for keeping said base member in pivoted position in which said switch means is disengaged from said follower means, and means for releasing said latch means.
8. In an electrically controlled centrifugal extractor, a frame, a lid member for the extractor mounted on said frame for opening and closing movements, a base member pivotably mounted for movements between first and second positions, means biasing said base member to the first position, switch means for controlling the extractor mounted on said base member, follower means movably mounted between said lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed and when said base member is in the first position, an arm member on said base member adapted to be engaged by the centrifugal extractor during conditions of unbalance to pivot said base member to the second position for disengaging said switch means from said follower means, and releasable means for keeping said base member in the second position.
9. In an electrically controlled centrifugal extractor, a frame, a lid member for the extractor mounted on said frame for opening and closing movements, a base member pivotably mounted for movements between rst and second positions, spring means for biasing said base member to the first position, switch means for controlling the extractor mounted on said base member, follower means movably mounted on said support member between said lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed and when said base member is in the first position, `an arm member on said base member adapted to be engaged by the centrifugal extractor during conditions o-f unbalance rto pivot said base member to the second position for disengaging said switch means from said follower means, latch means for keeping said base member against the bias of said spring means in the second position until released, and means for releasing said latch means when said lid member is opened.
l0. In an electrically controlled centrifugal extractor, a frame, a lid member for the extractor mounted on said frame for opening and closing movements, a base member pivotably mounted for movements between first and second positions, means biasing said base member to the rst position, switch means for controlling the extractor mounted on said base member, follower means movably mounted on said support member between said lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed and when said base member is in Ithe rst 6 position, an arm member on said base member adapted to be engaged by the centrifugal extractor Vduring conditions of unbalance for pivoting said base member to the second position to disengage said switch means from said follower means, latch means for keeping said base member in the second position until released, Iand means operatively associated with said -follower means for releasing said latch means when said lid member is opened.
ll. In an electrically controlled centrifugal extractor, a frame, a lid member mounted on said frame for opening `and closing movements, a base member pivotally mounted for movements between rst and second positions, switch means for controlling said extractor mounted on said base member, a plunger movably mounted between said lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed, means biasing said base member to the first position in which said switch means is operatively engaged by said plunger, means for pivoting said base member to the second position away from said plunger to disengage said switch means under predetermined conditions, latch means for keeping sa-id base member in the second position until released, a trip member on said plunger for releasing said latter means, and spring means biasing said trip member to release said latch member when said lid member is opened.
l2. In an electrically controlled centrifugal extractor, a frame, a lid member mounted on said frame for opening and closing movements, a base member pivotally mounted for movements between rst and second positions, switch means for controlling said extractor mounted on said base member, `a plunger movably mounted between said lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed, means biasing said base member to the first position in which said switch means is operatively engaged by said plunger, means for pivoting said base member to the second position Iaway from said plunger -to disengage said switch means under predetermined conditions, spring biased latch means for keeping said base member in the second position until released, and la member on said plunger for releasing said latter means when said lid member is opened.
13. In an electrically controlled centrifugal extractor, a frame, a lid member mounted on said frame for opening and closing movements, a base member pivotally mounted for movements between iirst and second positions, switch means for controlling said extractor mounted on said base member, -a plunger operatively associated with said lid member movably mounted for engaging and holding said switch means in closed position when said lid member is closed, means biasing said base member to the rst position in which said switch means is operatively engaged by said plunger, means for pivoting said base member lto the second position away from said plunger to disengage said switch means under predetermined conditions, latch means for keeping said base member in the second position until released, and means operatively associated with said plunger for releasing said latter means when the lid member is opened.
14. In an electrically controlled centrifugal extractor, a frame, a lid member mounted on said frame for opening and closing movements, a base member pivotally mounted for movements between first and second positions, switch means for controlling said extractor mounted on said base member, a plunger movably mounted between said lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed, means biasing said base member to the rst position in which said switch means is operatively engaged by said plunger, means for pivoting said base member to the second position away from said plunger to disengage said switch means under predetermined conditions, means for keeping said base member in the second position until released, and means for releasing said latter means when the lid member is opened. 15. In an electrically controlled centrifugal extractor, a frame, a lid member mounted on said frame -or opening and closing movements, a base member pivotally mounted for movements between tirst and second positions, switch means for controlling said extractor mounted on said base member, `a plunger movably mounted between said -lid member and switch means for engaging and holding said switch means in closed position when said ylid member is closed, means biasing said base member to the iirst position in which said switch means is operatively engaged by said plunger, means for pivoting said base member to the second position away from said plunger to disengage said switch means under predetermined conditions, and releasable means for keeping said base member in the second position.
16. In an electrically controlled centrifugal extractor, a trarne, a lid member mounted on said frame for opening and closing movements, a .base member pivotally mounted for movements between rst and second positions, switch means for controlling said extractor mounted on said base member, a plunger movably mounted between said -lid member and switch means for engaging and holding said switch means in closed position when said lid member is closed, means biasing said base member to the rst position in which said switch means is operatively engaged by said plunger, means for pivoting said base member to the second position away from said plunger to disengage said switch means under predetermined conditions, and releasable spring biased latch means for keeping said base member in the second position.
References Cited in the le of this patent UNITED STATES PATENTS 1,394,398 Benjamin Oct. 18, 1921 2,882,360 VSisson Apr. 14, 1959 2,921,155 Basso Ian. 12, 1960
US838113A 1959-09-04 1959-09-04 Unbalance switch for centrifugal extractors Expired - Lifetime US2957959A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227835A (en) * 1964-10-06 1966-01-04 Borg Warner Combination out-of-balance and safety spin switch
US3569646A (en) * 1969-08-04 1971-03-09 Maytag Co Lid latch and switch operating mechanism
US3997751A (en) * 1975-02-24 1976-12-14 The Maytag Company Access door latch mechanism
US4497993A (en) * 1982-07-16 1985-02-05 Tokyo Shibaura Denki Kabushiki Kaisha Door lock apparatus of electric cooker
US5440086A (en) * 1994-04-04 1995-08-08 Maytag Corporation Unbalance switch mechanism

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1394398A (en) * 1918-11-18 1921-10-18 Benjamin Electric Mfg Co Electric-switch mechanism
US2882360A (en) * 1957-02-21 1959-04-14 Gen Motors Corp Domestic appliance
US2921155A (en) * 1958-02-10 1960-01-12 John D Scofield Self-adjusting switch

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1394398A (en) * 1918-11-18 1921-10-18 Benjamin Electric Mfg Co Electric-switch mechanism
US2882360A (en) * 1957-02-21 1959-04-14 Gen Motors Corp Domestic appliance
US2921155A (en) * 1958-02-10 1960-01-12 John D Scofield Self-adjusting switch

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227835A (en) * 1964-10-06 1966-01-04 Borg Warner Combination out-of-balance and safety spin switch
US3569646A (en) * 1969-08-04 1971-03-09 Maytag Co Lid latch and switch operating mechanism
US3997751A (en) * 1975-02-24 1976-12-14 The Maytag Company Access door latch mechanism
US4497993A (en) * 1982-07-16 1985-02-05 Tokyo Shibaura Denki Kabushiki Kaisha Door lock apparatus of electric cooker
US5440086A (en) * 1994-04-04 1995-08-08 Maytag Corporation Unbalance switch mechanism

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