US3139564A

US3139564A - Magnet operated devices

Info

Publication number: US3139564A
Application number: US98800A
Authority: US
Inventors: William T Sevald
Original assignee: Individual
Current assignee: Individual
Priority date: 1961-03-28
Filing date: 1961-03-28
Publication date: 1964-06-30
Anticipated expiration: 1981-06-30

Description

Jun 1964 w. T. SEVALD MAGNET OPERATED DEVICES Filed March 28, 1961 United States Patent 3,139,564 MAGNET OPERATED DEVICES William T. Sevald, 1400 Cedarhill Drive, 'Royal Oak, Mich. Filed Mar. 28, 1961, Ser. No. 98,800 3 Claims. (Cl. 317-171) This invention relates to magnet operated devices and more particularly pertains to a device which is moved in both directions under the power furnished by primary and secondary magnetic reactions.

This application is a continuation-in-part of application Serial No. 41,312, filed July 7, 1960, for Magnet Operated Devices and Armatures.

Magnet operated devices have been employed heretofore, however, the several devices of the prior art have proved unsatisfactory due to the fact that they require mechanical or spring return or other power return such as electricity to effect movement in one direction as opposed to magnetic reaction movement in the other direction.

With the foregoing in View, the primary object'of the invention is to provide a device which is movable in one direction due to a primary magnetic reaction and movable in the opposite direction due to a secondary magnetic reaction.

An object of the invention is to provide a device having a normal position obtained via the secondary magnetic reaction.

An object of the invention is to provide a primary magnetic reaction which overpowers the secondary magnetic reaction to move the device in the direction opposite to that which is moved by the secondary magnetic reaction.

An object of the invention is to provide means for selectively activating the primary magnetic reaction for selectably moving the device in the direction opposite to the secondary magnetic reaction movement.

An object of the invention is to use magnets of the same power for both reactions by reducing the reactive power between the secondary magnet and armature.

An object of the invention is to provide a relatively stronger primary reaction and a relatively weaker secondary reaction by employing magnets of different power.

An object of the invention is to provide bi-directionally magnetically operated means for actuating switches, counters, valves, etc.

These and other objects of the invention will become apparent by reference to the following description of a magnet operated device embodying the invention taken in connection with the accompanying drawing in which:

FIG. 1 is a longitudinal cross sectional view, partly in elevation, of the device seenin FIGS. 2, 3 and 4 on a reduced scale.

FIG. 2 is a reduced cross-sectional view of FIG. 1 taken on the line 2-2 thereof.

FIG. 3 is a reduced cross-sectional view of the device seen in FIG. 1 taken on the lines 3-3 thereof.

FIG. 4 is a reduced cross-sectional view of the device seen in FIG. 1 taken on the line 4-4 thereof.

FIG. 5 is a longitudinal cross-sectional view of the device seen in FIGS. 6 and 7.

FIG. 6 is a cross-sectional view of FIG. 5 taken on the line 6-6 thereof.

FIG. 7 is a cross-sectional view of FIG. 5 taken on the line 7-7 thereof.

FIG. 8 is a cross-sectional view of the device seen in FIG. 9 taken on the line 88 thereof.

FIG. 9 is a cross-sectional view of the device seen in FIG. 8 taken on the line 9-9 thereof.

FIG. 10 is a cross-sectional view of the device seen in FIG. 8 taken on the line 10-10 thereof showing the magnets in the normal secondary position; and

ICC

FIG. 11 is a view similar to FIG. 10 showing the magnets in the primary position.

Referring now to the drawing wherein like numerals refer to like and corresponding parts throughout the several views, the magnet operated devices disclosed therein to illustrate the invention comprise a case 20 providing a housing, slide, and track having a first primary end 21 and second secondary end 22, a secondary armature 23 fixed adjacent to the secondary end 22, a secondary magnet 24 located adjacent the secondary armature 23, a primary magnet 25 located adjacent the first end 21, an arm 26 interconnecting the

magnets

24 and 25; a switch disc 27 carried by the arm 26 slidably engaging the contact 2S, normally closing with contact 29, and selectively closing with contact 30 upon breaking with contact 29. The spacer 31 separates the secondary magnet 24 and secondary armature 23 thereby diminishing the magnetic reaction power therebetween so that when the primary armature 32 moves adjacent the case front end 21 the primary magnetic reaction between the primary armature 32 and the primary magnet 25 overcomes the space wise weakened secondary reaction and causes the magnet 25 to move to the end of the case 21 towards the primary armature 32 and dragging with it the secondary magnet 24 via the arm 26 and causing the switch disc 27 to break with the contact 29 and make with the contact .30 while in sliding engagement with the contact 28. Upon the primary armature 32 being removed from the first end 21, the primary magnetic reaction is deactivated whereupon the secondary magnetic reaction between the secondary magnet 24 and the secondary armature 23 causes the secondary magnet 24 to move towards the case second end 22 and dragging with it the primary magnet 25 via the arm 26 and causing a break between the'switch disc 27 and the contact 30 and a make with normally closed contact 29.

Referring to the device seen in FIGS. 5-7, it is to be noted that the primary magnet 50 is relatively larger than the secondary magnet 51 so that the magnetic reaction between the primary magnet 50 and the primary armature 52 is much stronger than the secondary reaction between the secondary magnet 51 and the secondary armature 53 so that upon the primary armature 52 moving against the front end of the case 54, theprimary magnet 50 moves towards the case front end 55 dragging with it the secondary magnet 51 via the arm 56; upon the primary armature 52 being removed, the secondary magnetic reaction between the secondary magnet 51 and secondary armature 53 causes the secondary magnet 51 to move towards the secondary armature 53 dragging with it the primary magnet50 via the interconnecting arm 56.

Referring now to the device seen in FIGS. 811, a case 70houses a relatively small secondary magnet 71 in spaced relationship relative to the secondary armature 72 via the spacer 73 so that thesecondary magnet cannot freeze against the face of the armature 72. The secondary magnet 71 is interconnected via the arm 74 to the primary magnet 75 which is adapted to selectively cooperate with the primary armature 76, and as has been previously described, when the primary armature 76 is proximate to the end of the primary magnet 75 the magnets will move from the position seen in FIG. 8 to that seen in FIG. 11. Upon removal of the primary magnet 76 from a position proximate the end of the primary magnet 75, the secondary magnet 71 returns both magnets to the position seen in FIG. 8.

The yoke 80 is pivotally connected on either side of the case 70 on the pin 81 and the yoke has a central aperture 82 which receives the projection 83 on the disc 84 fixably mounted on the arm 74 so that as the magnets and arm 74 move between the position seen in FIG. 10 and the position seen in FIG. 11, the yoke 80 is caused aiaasea d: to pivot which moves the projecting lever 84 and the crank 35 with the yoke 80 from the solid line position seen in FIG. 8 to the dotted line position thereof to actuate the crank 85 on the shaft 86 which in turn operates the digital counter 87.

While an electrical switch and a digital counter has been shown as suitable items to be operated by the mag net operated devices, it is also to be understood that any other device can just as well be operated, such as valves, etc.

It is important to note that the force that moves the device in either direction or in both directions is the force of magnetic attraction with the secondary force being constituted relatively weaker than the primary magnetic force; that upon activation of the primary magnetic force it overcomes the weaker secondary magnetic force causing the device to move towards the primary end of the device whereupon de-activation of the primary force, the secondary force reacts to reposition the secondary magnet adjacent secondary end of the device.

It is to be noted that magnets of equal size can be employed as seen in FIGS. 1 through 4 wherein circular magnets are employed in a circular case and wherein a relatively larger spacer is used between the secondary magnet and the secondary armature to permit the primary magnet to have power greater than the reactive force set up between the secondary magnet as spaced from the secondary armature.

It is also to be noted inthe other embodiments of the invention that relatively larger and smaller magnets can be used and that the spacers can also be used with difi'erent size magnets.

In other words, a relatively smaller magnet can be used in the device of FIGS. 1 through 4 and the spacer 31 eliminated or substantially reduced or conversely, the same size magnet could be used in the device seen from FIGS.

5 through ll and spacers used to create the relative difference in power between the secondary and primary magnetic forces.

The inventive device with these features constitutes a compact, durable, neat appearing mechanism easily operated and integrated'to operate various devices and it is to be particularly noted that it obviates the use of spring or other mechanical and electrical returns in opposition to the primary magnetic force.

Although but a few embodiments of the invention have been shown and described in detail, it is obvious that many changes may be made in the size, shape, detail and arrangement of the various elements of the invention within the scope of the appended claims.

armature and to drag with it said primary armature via said arm; and a primary armature selectably movable into and out of reactive range with said primary magnet at said slide means primary end; the primary magnetic reaction between said primary armature and primary magnet being overpoweringly stronger relative to the secondary magnetic reaction between said secondary armature and secondary magnet to cause said primary magnet to move toward said primary armature when said primary armature is reactively proximate dragging with it said secondary magnet via said arm; said secondary armature and magnet being within reactive range of one another at all times to effect retraction of said secondary magnet toward said secondary armature when said primary armature is reactively remote.

2. In a device as set forth in claim 1, a spacer between saidsecondary magnet and said secondary aramature positioning and locating said secondary magnet in its most proximate position to said secondary armature at a point of relatively weak secondary magnetic reaction relative to the primary magnetic reaction between said primary armature and primary magnet so that upon said primary armature moving into magnetic reaction with said primary magnet, said primary magnet moves toward said primary armature dragging said secondary magnet with it overcoming said relatively weak secondary magnetic reaction as controlled by said spacer.

3. A bi-directionally operated device powered in opposite directions by magnets comprising a case having a first end and a second end, a primary magnet slidably disposed in said case adjacent said first end, a secondary magnet slidably disposed in said case adjacent said second end, an arm interconnecting said magnets, a secondary armature in said case adjacent said secondary magnet at all times to cause said secondary magnet normally to move toward and locate itself adjacent said secondary armature via secondary magnetic reaction therebetween and to also move said primary magnet via said arm, a primary armature adjacent said case first end selectably movable between a position reactively remote and a position within reactive range of said primary magnet to efrect primary magnetic reaction therebetween to cause said primary magnet to move toward said primary armature and with it said secondary magnet via said arm; said primary magnetic reaction being relatively stronger than said secondary magnetic reaction so as to overcome the ever present secondary magnetic reaction to effect movement of said magnets toward said primary armature when said primary armature magnetically reacts with said primary magnet; said secondary magnetic reaction moving said magnets toward said secondary armature when said primary armature is reactively remote from said primary magnet.

References (Iited in the file of this patent UNITED STATES PATENTS 2,372,853 Ray Apr. 3, 1945 2,969,445 Mitchell Jan. 24, 1961 FOREIGN PATENTS 688,402 Great Britain Mar. 4, 1953

Claims

1. A DEVICE ACTUATED IN OPPOSITE DIRECTIONS BY MAGNETIC REACTION COMPRISING SLIDE MEANS HAVING A PRIMARY END AND A SECONDARY END, A PRIMARY MAGNET ON SAID SLIDE MEANS ADJACENT SAID PRIMARY END, A SECONDARY MAGNET ON SAID SLIDE MEANS ADJACENT SAID SECONDARY END, AN ARM INTERCONNECTING SAID MAGNETS MECHANICALLY EFFECTING MOVEMENT OF ONE SAID MAGNET WITH THE OTHER BETWEEN THE ENDS OF SAID SLIDE MEANS, A SECONDARY ARMATURE ON SAID SLIDE MEANS SECONDARY END MAGNETICALLY REACTING WITH SAID SECONDARY MAGNET CAUSING SAID SECONDARY MAGNET NORMALLY TO MOVE TOWARD AND LOCATE AT SAID SECONDARY ARMATURE AND TO DRAG WITH IT SAID PRIMARY ARMATURE VIA SAID ARM; AND A PRIMARY ARMATURE SELECTABLY MOVABLE INTO AND OUT OF REACTIVE RANGE WITH SAID PRIMARY MAGNET AT SAID SLIDE MEANS PRIMARY END, THE PRIMARY MAGNETIC REACTION BETWEEN SAID PRIMARY ARMATURE AND PRIMARY MAGNET BEING OVERPOWERINGLY STRONGER RELATIVE TO THE SECONDARY MAGNETIC REACTION BETWEEN SAID SECONDARY ARMATURE AND SECONDARY MAGNET TO CAUSE SAID PRIMARY MAGNET TO MOVE TOWARD SAID PRIMARY ARMATURE WHEN SAID PRIMARY ARMATURE IS REACTIVELY PROXIMATE DRAGGING WITH IT SAID SECONDARY MAGNET VIA SAID ARM; SAID SECONDARY ARMATURE AND MAGNET BEING WITHIN REACTIVE RANGE OF ONE ANOTHER AT ALL TIMES TO EFFECT RETRACTION OF SAID SECONDARY MAGNET TOWARD SAID SECONDARY ARMATURE WHEN SAID PRIMARY ARMATURE IS REACTIVELY REMOTE.