US2206469A - Safety means for wringer rolls - Google Patents

Description

y 2, 19404 J. E. PETERSON ET AL 2,206,469

SAFETY MEANS FOR WRINGER ROLLS Filed March 28, 1938 4 Sheets-Sheet 1 J? Eli Inventor 3 fs'fars'aiz #7 2,? Z Edward vj aaz By W m July 2, 1940. J. E. PETERSON ET AL ,7 2,205,469

SAFETY MEANS FOR WRINGER ROLLS Filed March 28, 1938 4 Sheets-Sheet 2 Q vii A ///A 7 \\\Y\\\\\\\ Inventors flfifi fera'oza l- Edward 6222(2 M Attorneys July 2, 1940.

SAFETY MEANS FOR .Filed March J. E. PETERSON ET AL WRINGER ROLLS 28, 1938 4 Sheets-Sheet 3 START 1i 6 T@ if-r 47 M v STOP Inventors dlifiezera'on 4/ rdeuard 622zzZ.

Afforneys y 1946- J. E. PETERSON ET AL 2,

SAFETY MEANS fOR WRINGER ROLLS Filed March 28, 1958 4 Sheets-Sheet 4 if Z4 My [a J9, .29"

Inventors flifizersazz 4/ Edward .jkztz .Jfforrzeys Patented July 2, 1940 2,206,489 SAFETY MEANS FOR wamcca nous James E. Peterson and Edward Saul, Camden, N. J.

Application March 28, 1938, Serial No. 198,526

2 Claims; (Cl. 68-253) The present invention appertains to new and useful improvements in means associated with wringer rolls of the power driven type whereby the rolls can be automatically stopped in the event the attendants fingers or clothes get caught between the rolls.

An important object of the invention is to provide safety means for washing machine wringer rolls whereby the power to the rolls will be shut off and a brake applied in the event anything over a predetermined thickness start to pass between the rolls.

Other objects and advantages reside in the positive action and fool-proofness of the mechanism.

Various other important objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawings:

2!) Figure 1 is a front elevational view with parts broken away.

Figure 2 is a section on the line 2-2 of Figure 1.

Figure 3 is a vertical sec-tion on the line 3-3 2.1 of Figure l.

Figure 4 is a front elevational view.

Figure 5 is a fragmentary horizontal sectional view.

Figure 6 is a fragmentary perspective view of 2 the guard plate.

Figure '7 is a sectional view through the switch box and through a part of the mechanism therein.

Figure 8 is a section on the line 8-8 of Fig- :..3 ure 7.

Figure 9 is an elevational view of the switch box.

Figure 10 is a side elevation of the motor and brake means therefor, the latter being shown in 4-1) section.

Figure 11 is a sectional view approximately on line H-H of Figure 10.

Figure 12 is a diagrammatic view disclosing the electrical connections between the electrical devices involved.

Referring to the drawings wherein like numerals designate like parts, it can be seen in Figure 1, that numeral 5 represents the frame of the wringer in the side portions of which are the ,7.) vertically movable bearing blocks 6-6 resting upon the shaft ends of the upper roll 1. Numeral 8 denotes the lower roll and numeral 9 denotes the pressure bar which is provided with downwardly disposed end portions having feet I!) resting upon the bearing blocks 6.

To adjust the spring bar 9, a screw shaft II is provided and has its upper smooth end portion l2 joumaled through the bearing l3in the top of the frame 5, this screw shaft being thread- I edly disposed through the thickened portion l4 5 .of the bar 9 and also through the thickened .numerals 23 and 24 and each consists of an insulating block 25 having a pair of parallel centrally disposed "contact fingers 25-25 provided with contacts 21-28 respectively at their lower ends and opposed spacially from the complementary contacts 28-38 of the opposed contact fingers 3l-32, respectively. Extending from the block downwardly between the fingers 25-3l and 28-32 are the spring contact fingers 33-34 which have their lower ends depending below; the complementary contacts and flaring laterally as at 35 so that the tapered upper end 36 of the 26 corresponding spreader 31 can readily ride between the same to move the fingers 33-34 from the contacts 21-28 to engage the contacts 29-30. when the roll! is extensively raised as when the operator's fingers are caught between the same 30 and the roll 8. To adjust the tension of the spring 9 and the bar IS, the upper end :of the screw "shaft H is provided with a polygonalshaped extension 38 over which the socket 39 on the hand wheel 40 can engage. i

It can be seen at this point that it is also preferable that the upper roll 1 be provided with a guard plate 4| connected by spring members 42 to cars 43 on the bearing blocks 6 as is clearly shown in Figure 1. 1

The drive motor 44 of the wringer is provided with the armature shaft 45 and on this is the usual drive pulley 48 (or other driving element) connected in any suitable manner with the drive roll.

Also on this armature shaft 45 is the dfum 41 with which the brake shoe 48 is engageable. This brake shoe 48 is connected by the spring strip 43 to a suitable bracket 50 carried by the frame of the machine. This shoe 48 is also pro- 1 vided with the extension 5| which is disposed in the magnetic field of the electromagnet 52 which is suitably supported by the frame of the machine. v

The switch assembly is generally referred to by numeral 53 and consists of the plate or panel 54 forming part of a casing 1|, and on which are located the contacts 5556. Slidable through guides 51-58 is the plunger 59 carrying the bridge piece 6|] which is capable of bridging the contacts 5556 and the spring 6| on this plunger 59 is adapted to urge the bridge piece 69 toward non-bridging position with respect to the contacts 55--56. The outer end of this plunger 59 is provided with the push button formation 62. Also mounted on this 'plate 54 is the plunger 63 having the push button formation 64 at its outer end. This is slidably disposed through the guide 65 and has a tapered extension 66 at its inner end opposed to the end portion of the angularlyshaped armature 66 which has its fulcrum point as at 61 and which at one end is provided with a yoke 68 for disposition into the channeled portion 69 of the plunger 59. A spring 6| suitably connected to the casing II and to the armature 66 oposes the action of the spring 6| so that said springs 6|, 6| normally balance the plunger 59 into a retracted position in which the bridge piece 60 is in non-bridging relation to the contacts 55, 56 and the switch open. However, the relation of the parts is such that if the plunger 59 is advanced the spring 6| will hold the same in such position and the switch closed.

Opposed to the opposite end of the armature 66 is the electro-magnet 10.

As shown in Figure 4, the tension on the roll I can be adjusted by comparing the plate 12 carried by the screw II which has the arrow I3 thereon with the scale 14 on the shell at the edge portion of the opening 16.

It can now be seen that numeral 11 represents the positive side of the current supply line while numeral 18 represents the return side. The side I1 extends to contacts 28, 21 of the switches 23, 24, by way of electro-magnet T0 and contacts 55. 56 and to one side of motor 44. Said side TI also extends to contacts 311, 29 of said switches 23, 24 by way of a shunt lead Illa and from said switches to one side of the brake electro-magnet 52 and through the latter to the return side 18.

So long as the fingers 3334 are'engaged with the contacts 2126 current is supplied to the motor 44, that is, provided the contacts 55-56 are bridged by the bridge-piece 66. In

this connection, when the button 62 is pressed,

it is held in pressed position until the starting.

winding 'of the motor 44 has released and is operating as an induction motor, due to the fact that it takes more current to start a motor than it does when the motorehas reached full speed. Therefore, there is not suflicient current flowing through the magnet when the motor has obtained full speed to attract the armature 66 which has been held in locked position by the tension of the spring 6|. If the motor stops because something in the machine has prevented from turning, the starting winding of the motor would then be engaged causing suflicient current to flow through the magnet I0, to attract the armature 66 resulting in the retraction of the button 62 and retraction of the bridge-piece 60 into non-bridging relation. The function of the switch 53 is to prevent any serious damage to the motor by having current left on the motor when the motor has been stopped by a too heavy load or by some part of a machine becoming jammed. V

When the contacts 33, 34 are engaged with the contacts 29, 30, as under the conditions previously described, the current flows from side 71 by way of lead 10a and said contacts to one side of the brake electro-magnet 52 and through the same to return side 18, thus energizing said electro-magnet and attracting brake shoe 48 to apply the same to the armature shaft 45 of the motor 44.

The plunger 64, as will be clear, may be operated at any time to move the bridge-piece 60 into non-bridging, switch-opening position to thereby manually stop the motor 44.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

1. In a wringer comprising a frame, a pair of rolls rotatably mounted in said frame and relatively separable, pressure means opposing separation of said rolls, a drive for rotating said rolls including an electric motor, a motor circuit, and switch means responsive to separation of said rolls in predetermined degree to break said circuit.

2. In a wringer comprising a frame, a pair of rolls rotatably mounted in said frameand relatively separable, pressure means opposing separation of said rolls, a drive for rotating said rolls including an electric motor, a motor circuit, switch means responsive to separation of said rolls in predetermined degree to break said circuit, and an electric brake for said rolls operative under control of said switch means simultaneously with the breaking of said motor circuit.

JAMES E. PETERSON. EDWARD SAUL.

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