US3117257A - Solenoid having a rotatable back stop for the plunger - Google Patents

Solenoid having a rotatable back stop for the plunger Download PDF

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US3117257A
US3117257A US170684A US17068462A US3117257A US 3117257 A US3117257 A US 3117257A US 170684 A US170684 A US 170684A US 17068462 A US17068462 A US 17068462A US 3117257 A US3117257 A US 3117257A
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plunger
backstop
solenoid
coil
opening
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US170684A
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Richard S Stone
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ANDERSON CONTROLS Inc
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ANDERSON CONTROLS Inc
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/10—Electromagnets; Actuators including electromagnets with armatures specially adapted for alternating current
    • H01F7/12—Electromagnets; Actuators including electromagnets with armatures specially adapted for alternating current having anti-chattering arrangements
    • H01F7/1205—Electromagnets; Actuators including electromagnets with armatures specially adapted for alternating current having anti-chattering arrangements having short-circuited conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/20—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil

Definitions

  • This invention relates to a novel solenoid, particularly to a solenoid constructed to have means to eliminate or greatly reduce buzzing when it is actuated with A.C. energy.
  • the plunger of a solenoid is a magnetic member that moves between two positions in use.
  • the actuating coil When the actuating coil is energized, the plunger is drawn into a closed-gap position where it comes to rest against an element placed to restrain its movement. This element is called a backstop.
  • a restoring force such as a spring or a hydraulic or pneumatic device, forces the plunger away from the backstop into its second position which is limited either by a mechanical element that interferes with further movement or simply by the extent of the means exerting the restoring force.
  • Solenoids that are actuated by A.C. energy tend to buzz or chatter because, as the alternating actuating energy passes through zero voltage, the magnetic force decays and the restoring force moves the plunger slightly away from the back stop. When the flux is again established, the plunger is snapped into contcat with the back stop again. The collective result of this sequence of events occurring twice each cycle is a buzz or chatter.
  • an annulus of copper is embedded into the face of the backstop or sometimes the plunger.
  • the shading ring is usually positioned to be concentric with the axis of the plunger.
  • the backstop which forms part of the magnetic circuit of the solenoid, is made of magnetiza-ble material, and the shading ring becomes, in effect, a single winding of a transformer of which the backstop is the core.
  • the alternating magnetic flux produced by the coil of the solenoid acting through the shading ring changes the phase of a portion of the alternating magnetic flux in the backstop.
  • the solenoid is installed to do work on a load that is non-axial or eccentric with the plunger, the plunger will tip against the guides twice each cycle and create a buzz.
  • the restraining face of the backstop must be perpendicular to the resultant of the force components of the axial magnetic force and the non-axial mechanical force. Therefore, a solenoid that is adjusted to be quiet under no load conditions may buzz when installed for its ultimate use due to the introduction of non-axial load on the plunger.
  • the solenoid of this invention contains the usual elements of a solenoid which may include a coil, a plunger, a means to exert restoring force, a shading ring, and the elements required to make a magnetic circuit. Additionally, the solenoid of this invention is provided with a backstop that is formed with the plunger-restraining face non-perpendicular to the axis of the backstop. The backstop so formed is then rotatably mounted in the usual position in a solenoid, and preferably it is mounted to be difiicultly rotatable so that it will remain in an adjusted position. The backstop may also be provided with adjusting ele ments such as a slot to receive a screw driver or flats for engagement with a wrench.
  • the orientation of the parts may be quickly changed to create a new set of conditions for the backstop by such simple means as tapping the frame a few times with a hammer or bending it slightly with a screw driver or pliers. These changes in orientation constitute a rough adjustment because they, in themselves, do not stop buzzing. The changes in orientation just create a new set of conditions or a new environment in which the adjustable backstop may work.
  • FIG. 1 is an elevation view, that is partly in section and partly schematic, of a solenoid embodying this invention
  • FIG. 2 illustrates a bottom view of the solenoid of FIG. 1
  • FIG. 3 is a plan view of the back stop element of the assembly shown in FIG. 1;
  • FIG. 4 is a sectional view of FIG. 3 taken along the line 4 4.
  • the main structural element of the illustrated solenoid is a frame that supports most of the elements and maintains proper relative positions.
  • the frame 10 is in the shape of a 0 having a main connecting element 11 holding an upper extension or embracing element 12 spaced from a lower extension or embracing element 13.
  • a coil 15 is embraced between the upper and lower extensions.
  • the coil -15 surrounds 'a guide tube 16 which is parallel to the connecting element 11 and extends between the upper extension 12 and the lower extension 13.
  • An opening 17 in the upper extension 12 and another opening 18 in the lower extension '13 are aligned with each other and placed so that they open into opposite ends of guide tube 16.
  • a plunger 20 rides in the guide tube 16 and extends through the opening 17 in the upper extension 12.
  • a contracted portion 21 of the plunger is employed to hold the small end of a conical compression spring 22, the large end of which rests against the upper portion of upper extension 12.
  • the spring 22 is the means for supplying a restoring force to the plunger 20.
  • a backstop 23 is connected within the hole 18 in the lower extension 13.
  • One face of the backstop is a plunger-engaging surface 25 having a copper shading ring 26 embedded in it.
  • the surface '25 lies in a plane at an angle A from the plane perpendicular to the axis of rotation of the backstop 23 and it is positioned to form a closed end in the guide tube 16. 'In the drawing, the angle A is exaggerated for purposes of illustration.
  • the backstop 23 also has a radially contracted portion 2 7 and an adjusting portion 28 that protrudes fro-m the hole 18.
  • the portion 28 is of smaller diameter than hole 18, but of greater diameter than portion 27.
  • the surface 25 and the main body 24 of the backstop are of greater diameter than hole 18.
  • the adjusting portion 28 is adapted with a toolengaging means such as the slot 30 to receive a screw driver.
  • the assembly of the solenoid of this invention is quite simple.
  • the guide tube 16 is placed between the upper frame extension 12 and the lower frame extension 13 and fixed in place by the pressure of those two elements, by lapping the end of the tube, by welding, by brazing or by other conventional means.
  • the coil and guide tube may be a single integral unit, for example, as when a coil is potted in plastic with a cylindrical opening down the center of the plastic body to act as a guide tube. After the coil and guide tube are assembled, the backstop is introduced through opening '17 in the upper frame extension and passed through the guide tube so that the element 28 extends through the lower opening 18.
  • the spring clip also causes sufficient friction between surface 32 of the main body of the backstop, and inner surface 33 of extension 13 to render backstop 23 difficultly rotatable.
  • the plunger 20 may then simply be placed in the guide tube so that the spring 22 engages the upper surface 35 of extension 12 to hold the plunger in its extended stable position.
  • a source of AC. energy is connected to the coil 15 by conventional means which are not shown.
  • the mag netic circuit which includes the plunger 20, the frame 10 and the backstop 23 causes the plunger to retract into the guide tube 16 and to come in contact with the plunger engaging surface 25 thereby compressing the spring and doing work on whatever mechanical element is connected to its other end, such as a valve stem.
  • the characteristic buzz from the plunger may occur when the coil is energized. 'Ihe backstop 23 is then slowly rotated to tune the solenoid to a position of no buzz or to a position of minimum buzz.
  • the angle A that the surface 25 forms with a plane perpendicular to the axis of the backstop will depend upon the details of construction of any particular solenoid and to some extent on its intended use.
  • the angle A is usually a very small angle, in the range from about one-half degree to about two degrees.
  • a solenoid tunable for maximum buzz is useful, for example, if it is employed to operate a safety device in which the buzz of the solenoid acts as an alarm.
  • the solenoid may not only be tuned for maximum buzz, but the backstop may be constructed with the angle A larger than usual to promote as much tilting of the plunger as possible.
  • a solenoid comprising a coil having an opening therethrough, said coil maintained between spaced first and second embracing elements, a plunger at least partly within said opening, force exerting means connected to urge said plunger from within the opening in said coil, and a backstop rotatably mounted in said first embracing element to close one end of the opening in said coil and positioned to engage the plunger when it is drawn into the coil, said backstop having a copper annulus embedded in the plunger-engaging face, said plunger-engaging face lying in a plane that is not perpendicular to the axis of rotation of said backstop.
  • the solenoid of claim 1 further characterized in that the plunger-engaging face of said backstop lies in a plane that is at an angle of from about one-half degree to about two degrees to a plane perpendicular to the axis of rotation of said backstop.
  • a solenoid comprising a coil having a central opening therein, said coil maintained between spaced first and second embracing elements, a plunger guide means axial with the opening in said coil, a plunger coaxial with said guide means and at least partly within the end of said guide means opposite said first embracing element, force exerting means connected to urge said plunger from within said guide means, and a backstop mounted in said first embracing element to be ditficultly rotatable and positioned with a plunger-engaging face within said guide means, said backstop having a copper annulus embedded in the plunger-engaging face, said plunger-engaging -face lying along a plane that is at an angle of from about one-half degree to about two degrees from the plane that is perpendicular to the axis of rotation of said backstop.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)

Description

Jan. 7, 1964 R. s. STONE 7, 7 SOLENOID HAVING A ROTATABLE BACK STOP FOR THE PLUNGER Filed Feb. 2. 1962 FIG. 1
INVHVTOR. Richard 6? Stone BY United States Patent 3,117,257 SQLENOID HAVING A RDTATABLE BACK STOP FOR THE PLUNGER Richard S. Stone, Mount Prospect, IlL, assignor to Anderson Controls, Inc., Franklin Park, Ill., :1 corporation of Illinois Filed Feb. 2, 1962, Ser. No. 170,68
5 Claims. (Cl. 317-186) This invention relates to a novel solenoid, particularly to a solenoid constructed to have means to eliminate or greatly reduce buzzing when it is actuated with A.C. energy.
The plunger of a solenoid is a magnetic member that moves between two positions in use. When the actuating coil is energized, the plunger is drawn into a closed-gap position where it comes to rest against an element placed to restrain its movement. This element is called a backstop. When the coil is not energized, a restoring force, such as a spring or a hydraulic or pneumatic device, forces the plunger away from the backstop into its second position which is limited either by a mechanical element that interferes with further movement or simply by the extent of the means exerting the restoring force.
Solenoids that are actuated by A.C. energy tend to buzz or chatter because, as the alternating actuating energy passes through zero voltage, the magnetic force decays and the restoring force moves the plunger slightly away from the back stop. When the flux is again established, the plunger is snapped into contcat with the back stop again. The collective result of this sequence of events occurring twice each cycle is a buzz or chatter.
To avoid this buzz, an annulus of copper, called a shading ring, is embedded into the face of the backstop or sometimes the plunger. The shading ring is usually positioned to be concentric with the axis of the plunger. The backstop, which forms part of the magnetic circuit of the solenoid, is made of magnetiza-ble material, and the shading ring becomes, in effect, a single winding of a transformer of which the backstop is the core. The alternating magnetic flux produced by the coil of the solenoid acting through the shading ring, changes the phase of a portion of the alternating magnetic flux in the backstop. Thus, when the two portions of the flux are out of phase, there will always be magnetic flux in the circuit tending to resist the restoring force and thereby holding the plunger in contact with the backstop.
Even in a circuit containing a shading ring as described above, a fluctuating or pulsating force is exerted on the plunger. When the face of the backstop that restrains movement of the plunger is not perpendicular to the axis of the plunger, this pulsating lforce causes the plunger, which is loosely held in a guide, to tip and hit against the guide twice each cycle thereby producing a buzz. If, for example, the guide and backstop are in a C-shaped frame, adjusting perpendicularity by bending the frame is too ditlicult and time-consuming for mass production, and as a result, buzzing A.C. solenoids are considered inevitable and are simply endured.
Even if the solenoid were produced with the backstop perpendicular to the axis of the plunger as above described, when the plunger is connected to do work it may buzz due to its working environment. For example, if
the solenoid is installed to do work on a load that is non-axial or eccentric with the plunger, the plunger will tip against the guides twice each cycle and create a buzz. To avoid buzzing from non-axial mechanical loads, the restraining face of the backstop must be perpendicular to the resultant of the force components of the axial magnetic force and the non-axial mechanical force. Therefore, a solenoid that is adjusted to be quiet under no load conditions may buzz when installed for its ultimate use due to the introduction of non-axial load on the plunger.
This invention provides a novel structure for an A.C. actuated solenoid that permits the solenoid to be adjusted to tune out a buzz or chatter. The solenoid of this invention contains the usual elements of a solenoid which may include a coil, a plunger, a means to exert restoring force, a shading ring, and the elements required to make a magnetic circuit. Additionally, the solenoid of this invention is provided with a backstop that is formed with the plunger-restraining face non-perpendicular to the axis of the backstop. The backstop so formed is then rotatably mounted in the usual position in a solenoid, and preferably it is mounted to be difiicultly rotatable so that it will remain in an adjusted position. The backstop may also be provided with adjusting ele ments such as a slot to receive a screw driver or flats for engagement with a wrench.
When a newly assembled solenoid constructed in accordance with this invention is found to buzz due to lack of perpendicularity between the plunger and the backstop, the backstop can be slowly rotated thereby changing the angle that its plunger-restraining face makes with the axis of the plunger to a position which will compensate for the lack of perpendicularity.
When a solenoid, installed with its plunger connected to do WOl'k, bnzzes because of non-axial mechanical loads on the plunger, the backstop again can be slowly rotated to seek a position where the restraining face is perpendicular to the resultant of the Various force components on the plunger and thereby to tune out the buzz. It has been found in practice that a backstop formed with a restraining face at an angle in the order of from about one-half degree to two degrees or more with a plane perpendicular to its axis will almost always be adjustable to a position of quiet operation. In those few solenoids in which the angle is not properly complementary to compensate for the particular load characteristics or structural characteristics of the solenoids, the orientation of the parts may be quickly changed to create a new set of conditions for the backstop by such simple means as tapping the frame a few times with a hammer or bending it slightly with a screw driver or pliers. These changes in orientation constitute a rough adjustment because they, in themselves, do not stop buzzing. The changes in orientation just create a new set of conditions or a new environment in which the adjustable backstop may work.
The accompanying drawings illustrate a solenoid embodying this invention and are presented as illustrative of the invention rather than limiting on its scope.
FIG. 1 is an elevation view, that is partly in section and partly schematic, of a solenoid embodying this invention;
FIG. 2 illustrates a bottom view of the solenoid of FIG. 1;
FIG. 3 is a plan view of the back stop element of the assembly shown in FIG. 1; and
FIG. 4 is a sectional view of FIG. 3 taken along the line 4 4.
The main structural element of the illustrated solenoid is a frame that supports most of the elements and maintains proper relative positions. The frame 10 is in the shape of a 0 having a main connecting element 11 holding an upper extension or embracing element 12 spaced from a lower extension or embracing element 13. A coil 15 is embraced between the upper and lower extensions. The coil -15 surrounds 'a guide tube 16 which is parallel to the connecting element 11 and extends between the upper extension 12 and the lower extension 13. An opening 17 in the upper extension 12 and another opening 18 in the lower extension '13 are aligned with each other and placed so that they open into opposite ends of guide tube 16.
A plunger 20 rides in the guide tube 16 and extends through the opening 17 in the upper extension 12. A contracted portion 21 of the plunger is employed to hold the small end of a conical compression spring 22, the large end of which rests against the upper portion of upper extension 12. The spring 22 is the means for supplying a restoring force to the plunger 20.
A backstop 23 is connected within the hole 18 in the lower extension 13. One face of the backstop is a plunger-engaging surface 25 having a copper shading ring 26 embedded in it. The surface '25 lies in a plane at an angle A from the plane perpendicular to the axis of rotation of the backstop 23 and it is positioned to form a closed end in the guide tube 16. 'In the drawing, the angle A is exaggerated for purposes of illustration. The backstop 23 also has a radially contracted portion 2 7 and an adjusting portion 28 that protrudes fro-m the hole 18. The portion 28 is of smaller diameter than hole 18, but of greater diameter than portion 27. The surface 25 and the main body 24 of the backstop are of greater diameter than hole 18. The adjusting portion 28 is adapted with a toolengaging means such as the slot 30 to receive a screw driver.
The assembly of the solenoid of this invention is quite simple. The guide tube 16 is placed between the upper frame extension 12 and the lower frame extension 13 and fixed in place by the pressure of those two elements, by lapping the end of the tube, by welding, by brazing or by other conventional means. The coil and guide tube may be a single integral unit, for example, as when a coil is potted in plastic with a cylindrical opening down the center of the plastic body to act as a guide tube. After the coil and guide tube are assembled, the backstop is introduced through opening '17 in the upper frame extension and passed through the guide tube so that the element 28 extends through the lower opening 18. A spring clip 31 or other holding means that is adapted to engage the indentation 27 and to hold the entire backstop assembly 23 in tension, is placed around the indentation 27 thereby preventing the backstop from coming out of opening 18. The spring clip also causes sufficient friction between surface 32 of the main body of the backstop, and inner surface 33 of extension 13 to render backstop 23 difficultly rotatable. The plunger 20 may then simply be placed in the guide tube so that the spring 22 engages the upper surface 35 of extension 12 to hold the plunger in its extended stable position.
To operate the solenoid a source of AC. energy is connected to the coil 15 by conventional means which are not shown. When the coil is energized, the mag netic circuit which includes the plunger 20, the frame 10 and the backstop 23 causes the plunger to retract into the guide tube 16 and to come in contact with the plunger engaging surface 25 thereby compressing the spring and doing work on whatever mechanical element is connected to its other end, such as a valve stem. For the reasons set forth above, the characteristic buzz from the plunger may occur when the coil is energized. 'Ihe backstop 23 is then slowly rotated to tune the solenoid to a position of no buzz or to a position of minimum buzz. Of course, if the buzz is tuned out, as is the case with most solenoids constructed in accordance with this invention, there is no need for further adjustment. If the buzz is not completely tuned out by rotating the backstop 23, the relative position of extensions 12 and 13 may be slightly changed by prying them a bit further apart with a screw driver or tapping them closer together with a hammer. By this change of position, a new environment for the backstop 23 is created which will present another opportunity for the backstop to exist in a position where no buzz will be encountered.
The angle A that the surface 25 forms with a plane perpendicular to the axis of the backstop will depend upon the details of construction of any particular solenoid and to some extent on its intended use. The angle A is usually a very small angle, in the range from about one-half degree to about two degrees. However, it is within the scope of this invention to produce a solenoid that can be tuned for maximum buzzing. A solenoid tunable for maximum buzz is useful, for example, if it is employed to operate a safety device in which the buzz of the solenoid acts as an alarm. For such purposes, the solenoid may not only be tuned for maximum buzz, but the backstop may be constructed with the angle A larger than usual to promote as much tilting of the plunger as possible.
Although this invention is described with respect to the particular solenoid illustrated in the accompanying drawings, it is intended that the invention is of general application and is not limited to any particular construction.
Having thus described the invention, what is claimed l. A solenoid comprising a coil having an opening therethrough, said coil maintained between spaced first and second embracing elements, a plunger at least partly within said opening, force exerting means connected to urge said plunger from within the opening in said coil, and a backstop rotatably mounted in said first embracing element to close one end of the opening in said coil and positioned to engage the plunger when it is drawn into the coil, said backstop having a copper annulus embedded in the plunger-engaging face, said plunger-engaging face lying in a plane that is not perpendicular to the axis of rotation of said backstop.
2. The solenoid of claim 1 further characterized in that said backstop is held in said first embracing element by resilient means that produces a normal force between contacting surfaces on said backstop and said first embracing element whereby the resultant friction produces a difficultly rotatable connection therebetween and whereby said backstop is substantially immovable longitudinally of the axis of rotation of said backstop.
3. The solenoid of claim 1 further characterized in that the plunger-engaging face of said backstop lies in a plane that is at an angle of from about one-half degree to about two degrees to a plane perpendicular to the axis of rotation of said backstop.
4. The solenoid of claim 1 further characterized in that the plunger-engaging face of said backstop is maintained within the opening in said coil and the other side of said backstop extends through and beyond said first embracing element, said other side having tool-engaging means formed thereon.
5. A solenoid comprising a coil having a central opening therein, said coil maintained between spaced first and second embracing elements, a plunger guide means axial with the opening in said coil, a plunger coaxial with said guide means and at least partly within the end of said guide means opposite said first embracing element, force exerting means connected to urge said plunger from within said guide means, and a backstop mounted in said first embracing element to be ditficultly rotatable and positioned with a plunger-engaging face within said guide means, said backstop having a copper annulus embedded in the plunger-engaging face, said plunger-engaging -face lying along a plane that is at an angle of from about one-half degree to about two degrees from the plane that is perpendicular to the axis of rotation of said backstop.
References Cited in the file of this patent UNITED STATES PATENTS

Claims (1)

1. A SOLENOID COMPRISING A COIL HAVING AN OPENING THERETHROUGH, SAID COIL MAINTAINED BETWEEN SPACED FIRST AND SECOND EMBRACING ELEMENTS, A PLUNGER AT LEAST PARTLY WITHIN SAID OPENING, FORCE EXERTING MEANS CONNECTED TO URGE SAID PLUNGER FROM WITHIN THE OPENING IN SAID COIL, AND A BACKSTOP ROTATABLY MOUNTED IN SAID FIRST EMBRACING ELEMENT TO CLOSE ONE END OF THE OPENING IN SAID COIL AND POSITIONED TO ENGAGE THE PLUNGER WHEN IT IS DRAWN INTO THE COIL, SAID BACKSTOP HAVING A COPPER ANNULUS EMBEDDED IN THE PLUNGER-ENGAGING FACE, SAID PLUNGER-ENGAGING FACE LYING IN A PLANE THAT IS NOT PERPENDICULAR TO THE AXIS OF ROTATION OF SAID BACKSTOP.
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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3289042A (en) * 1963-01-24 1966-11-29 Ite Circuit Breaker Ltd Current limiting device
US3396354A (en) * 1966-09-01 1968-08-06 Deltrol Corp Solenoid with plunger
US3727160A (en) * 1972-03-24 1973-04-10 Automatic Switch Co Retaining clip for a solenoid assembly
US3916362A (en) * 1974-07-29 1975-10-28 Schantz Spencer C Solenoid
US3992687A (en) * 1975-06-20 1976-11-16 Spencer C. Schantz Buzz-proof solenoid
US5850170A (en) * 1989-11-07 1998-12-15 Siemens Aktiengesellschaft Electromagnetic differential current trigger
US20110049405A1 (en) * 2008-06-26 2011-03-03 Martin Bill Actuating device
US20120211688A1 (en) * 2011-02-23 2012-08-23 Honeywell International Inc. Valve actuator assembly with tool-less interconnect
US8887655B2 (en) 2012-01-25 2014-11-18 Honeywell International Inc. Valve actuator with position indicator extension
USD728071S1 (en) 2013-12-27 2015-04-28 Honeywell International Inc. HVAC actuator
US9423143B2 (en) 2013-12-18 2016-08-23 Honeywell International Inc. HVAC actuator with light indicator
US9568207B2 (en) 2013-12-18 2017-02-14 Honeywell International Inc. HVAC actuator with removable wire blocking tab
US9623523B2 (en) 2013-12-18 2017-04-18 Honeywell International Inc. HVAC actuator with taping flange
US9664409B2 (en) 2012-06-14 2017-05-30 Honeywell International Inc. HVAC damper system
US9732980B2 (en) 2013-12-18 2017-08-15 Honeywell International Inc. HVAC actuator with range adjustment
US10054166B2 (en) 2016-02-19 2018-08-21 Honeywell International Inc Valve actuator assembly
US10119721B2 (en) 2012-06-14 2018-11-06 Honeywell International Inc. Standoff for use with an insulated HVAC duct
US10302207B2 (en) 2012-06-14 2019-05-28 Honeywell International Inc. Spring loaded HVAC damper
US10920814B2 (en) 2018-04-05 2021-02-16 Honeywell International Inc. Bracket for mounting an actuator to an actuatable component
US20210057178A1 (en) * 2018-05-07 2021-02-25 Tdk Electronics Ag Switching Device
US10941960B2 (en) 2013-12-18 2021-03-09 Ademco Inc. HVAC actuator with position indicator

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US1005857A (en) * 1910-02-09 1911-10-17 Otis Elevator Co Alternating-current electromagnet.
US1894429A (en) * 1930-02-12 1933-01-17 Knapp Monarch Co Electromagnet
US2482860A (en) * 1945-12-14 1949-09-27 Price Electric Corp Core for electromagnets
US2735967A (en) * 1956-02-21 Electromagnetic relays

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735967A (en) * 1956-02-21 Electromagnetic relays
US1005857A (en) * 1910-02-09 1911-10-17 Otis Elevator Co Alternating-current electromagnet.
US1894429A (en) * 1930-02-12 1933-01-17 Knapp Monarch Co Electromagnet
US2482860A (en) * 1945-12-14 1949-09-27 Price Electric Corp Core for electromagnets

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3289042A (en) * 1963-01-24 1966-11-29 Ite Circuit Breaker Ltd Current limiting device
US3396354A (en) * 1966-09-01 1968-08-06 Deltrol Corp Solenoid with plunger
US3727160A (en) * 1972-03-24 1973-04-10 Automatic Switch Co Retaining clip for a solenoid assembly
US3916362A (en) * 1974-07-29 1975-10-28 Schantz Spencer C Solenoid
US3992687A (en) * 1975-06-20 1976-11-16 Spencer C. Schantz Buzz-proof solenoid
US5850170A (en) * 1989-11-07 1998-12-15 Siemens Aktiengesellschaft Electromagnetic differential current trigger
US20110049405A1 (en) * 2008-06-26 2011-03-03 Martin Bill Actuating device
US20120211688A1 (en) * 2011-02-23 2012-08-23 Honeywell International Inc. Valve actuator assembly with tool-less interconnect
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