Patent Grant
9859070
The present invention relates to circuit breakers and may be particularly suitable for Motor Control Center (MCC) units.
As is known to those of skill in the art, Motor Control Centers (MCC) can include cabinets or enclosures that hold multiple, typically modular, bucket assemblies or units of various sizes. See, e.g., U.S. Pat. No. 4,024,441, the contents of which are hereby incorporated by reference as if recited in full herein. Eaton Corporation has recently introduced a MCC product line with compact bucket assemblies that conveniently plug into a slot or space in an MCC cabinet. The product is sold under the product name, Freedom 2100 MCC. See also, U.S. Patent Application Publication Serial Number US2013/0077210, the contents of which are hereby incorporated by reference as if recited in full herein.
The bucket assemblies or units can include rotary handles that are disposed on the front door. The rotary handle can be configured to convert the rotary motion of the rotary handle to the linear or translational motion of a circuit breaker linear action lever. See, e.g., U.S. Pat. Nos. 6,194,983 and 7,186,933, the contents of which are incorporated by reference as if recited in full herein. The rotary handle is typically mounted parallel with the plane of the faceplate of the molded case circuit breaker, but spaced outwardly from it by the depth of the handle mechanism. Usually a series of linkages are utilized to interconnect the rotary motion of the rotary handle to the linear motion of the circuit breaker handle or lever.
Workplace guidelines, such as regulatory guidelines including National Fire Protection Association (NFPA) standards 70 National Electrical Code, and No. 70 E Personal and Other Protective Equipment, require a “Lockout and Tagout” procedure.
Despite the above, there remains a need for alternate operator disconnect handle designs that can facilitate human interfaces with the handles to comply with safety regulations and/or provide an easier to use configuration.
Embodiments of the invention provide disconnect operating handles for circuit breakers with enhanced safety features and/or easy to use configuration to facilitate user interaction.
Embodiments of the invention provide disconnect operating handles which can provide an externally visible visual indication of the status of the circuit breaker so that an observer can tell whether the circuit breaker is conducting electrical current or blocking electrical current.
Embodiments of the invention are directed to disconnect operator handles. The handles include: (a) a cover having an elongate channel; (b) an elongate lockout lever having opposing spaced apart first and second end portions held in the elongate channel, the second end portion of the elongate lockout lever configured to pivot outward from the elongate channel and expose a lockout passage residing under an outer surface of the lever; (c) a lever pivot pin attached to the elongate lever to pivotably hold the lever in the elongate channel; and (d) at least one resilient member residing under and in communication with the lever. The at least one resilient member pushes the lever to expose the lockout passage in response to when a user depresses the lever at a defined location.
The elongate lever can have a transverse channel residing in a medial portion of the lever between the first and second end portions and the lever pivot pin resides in the transverse channel.
The disconnect operator handle can include a handle core with outwardly extending spaced apart walls, each with a respective pivot pin holder. The lever can reside between the handle core walls with the lever pivot pin extending into the handle core pivot pin holders. The operator handle can also include at least one lockout pin held by the first end portion of the lever, the at least one lockout pin can extend inwardly below the cover. The handle can also include a magnetic latch with at least one permanent magnet held by the handle core under a second end portion of the lever. The magnetic latch can be configured to latch the lever to the handle core so that the handle core, outer cover and lever can rotate as a unit when latched.
The disconnect operator handle can include at least one lockout pin held by the first end portion of the elongate lever. The at least one lockout pin can extend inwardly.
The disconnect operator handle can include a handle core with outwardly extending spaced apart walls, each with a respective pivot pin holder. The lever can reside between the handle core walls with the lever pivot pin extending into the pivot pin holders.
The at least one resilient member can reside under the lever pivot pin in a cavity in a handle core and is configured to be held trapped between a leg extending below the lever in the cavity in at least a partially compressed state while being able to flex angularly in the cavity to move radially inward and outward at a top portion thereof to thereby provide rotational torque for a toggle-assist action of the handle between operative positions.
The at least one resilient member can be or include a spring held under the pivot pin of the lever that presses outward against a bottom surface of the lever to force the second end portion of the lever to pivot outward.
The disconnect operator handle can include at least one light illuminating segment proximate the lever or in the lever that is externally visible.
The disconnect operator handle can include a base that holds the cover with the elongate lever to a housing panel of a circuit breaker and allows the cover and lever to rotate through defined operational positions. The base can hold a drive shaft holder and can include an aperture that slidably receives the at least one lockout pin to inhibit or prevent handle rotation out of a defined operating position when the lever is extended to expose the lockout space.
The resilient member can include a spring held under the second end portion of the lever that presses outward against a bottom surface of the second end portion of the lever to force the lever to pivot outward.
The disconnect operator handle can include a handle core residing under the cover with outwardly extending spaced apart walls, each with a respective pivot pin holder. The lever can reside between the handle core walls with the lever pivot pin extending into the pivot pin holders. The disconnect operator may also include a base that resides under and is attached to the handle core, the base adapted to hold the handle core, the cover with the elongate lever to a housing panel of a circuit breaker and allows the handle core, the cover and the lever to rotate as a unit through defined operational positions. The disconnect operator handle may also include at least one lockout pin held by the first end portion of the elongate lever, the at least one lockout pin extending inwardly a length sufficient to extend through an aperture in the base to lock the handle core, cover and lever in a defined operational position when the second end portion of the lever is pivoted outward to expose the lockout space and the first end portion of the elongate lever is pivoted inward.
The at least one lockout pin may be a single lockout pin and includes an aperture in atop end portion thereof, the disconnect operator further comprising a retainer pin extending through the single lockout pin and extending through a cooperating front end portion of the elongate lever.
The base aperture can have a curvilinear configuration adapted to allow a limited defined circumferential movement of the cover, lever and core unit in the OFF position.
The disconnect operator can include at least one inwardly extending lockout pin held by the front end portion of the lever and a circular handle core residing under the cover. The handle core can have an outer surface that includes pair of outwardly extending spaced apart walls, each with a respective pivot pin holder. The lever can reside between the handle core walls with the lever pivot pin extending into the pivot pin holders.
The handle core can include an aperture residing on an outer perimeter aligned with the first end portion of the lever to allow the at least one lockout pin to extend therethrough and a resilient member retention feature or member residing between the walls under the second end portion of the lever.
The outer surface of the handle core can include a flat segment between the walls and a segment that angles toward the front end portion of the lever. The pivot pin holders can reside above and adjacent a peak that transitions the flat segment to the angled segment.
The disconnect operator can include at least one light illuminating segment proximate the lever or in the lever that is externally visible and a light guide extending through the handle core to a location between the second end portion of the lever and an external surface of the cover thereat. The light guide can include a light pipe held by the handle core and the cover.
Still other embodiments are directed to a bucket assembly for a circuit breaker. The assembly including an external rotary operating mechanism disconnect handle having a defined ON position and OFF position associated with conduction and non-conduction and a shaft attached to the rotary handle and extending into the bucket assembly. The operating mechanism disconnect handle can include: (a) a base fixedly attached to the bucket assembly; (b) an outer cover with an elongate channel attached to the base; (c) an elongate lockout lever having opposing spaced apart first and second end portions held in the elongate channel of the outer cover, the second end portion of the elongate lockout lever configured to pivot outward from the elongate channel and expose a lockout passage residing under an outer surface of the lever; (d) a lever pivot pin attached to the elongate lever to pivotably hold the lever in the elongate channel; and (e) at least one resilient member residing under and in communication with the lever. The at least one resilient member can automatically push the lever outward to expose the lockout passage in response to when a user depresses the lever and the outer cover with the lever can rotate to the defined ON and OFF positions while the base remains in a fixed position attached to the bucket assembly.
The rotary handle can include at least one lockout pin held by the first end portion of the elongate lever. The at least one lockout pin can extend inwardly a length sufficient to extend through an aperture in the base to lock the cover and lever in a defined operational position when the second end portion of the lever is pivoted outward to expose the lockout space and the first end portion of the elongate lever is pivoted inward.
The rotary handle can include a circular handle core residing between the base and cover. The handle core can include an outer surface with a pair of outwardly extending spaced apart walls, each with a respective pivot pin holder. The lever can reside between the handle core walls with the lever pivot pin extending into the pivot pin holders.
The handle core can include an aperture residing on an outer perimeter portion to be aligned with the first end portion of the lever to allow the at least one lockout pin to extend therethrough. The handle core can also include a resilient member retention feature or member residing between the walls under the second end portion of the lever. The outer surface of the handle core can include a flat segment between the walls and a segment that angles inward (down) toward the front end portion of the lever. The pivot pin holders can reside above and adjacent a peak that transitions the flat segment to the angled segment.
The bucket assembly can include at least one light illuminating segment residing proximate the lever and/or in the lever that is externally visible and at least one light guide extending through the rotary handle from a light source held in the bucket assembly to the at least one light illuminating segment.
The light source can include a plurality of LEDs (light emitting diodes) in different colors that selectively communicate with the at least one light guide to selectively illuminate the light illuminating segment with a color associated with a defined operational condition or status of the circuit breaker in the bucket assembly.
The base may optionally include a circumferentially extending cantilevered arm on an inner perimeter thereof that cooperates with underlying aligned surface features at respective ON and OFF/RESET positions to provide a detent for the handle.
The at least one resilient member can reside under the lever pivot pin in a cavity in the handle core and is configured to be held trapped between a leg extending below the lever in the cavity in at least a partially compressed state while being able to flex angularly in the cavity to move radially inward and outward at a top portion thereof to thereby provide rotational torque for a toggle-assist action of the handle between operative positions.
The operating mechanism disconnect handle may also include a circular handle core residing between the base and cover and a magnetic latch comprising at least one permanent magnet held by the handle core under a second end portion of the lever, and wherein the magnetic latch is configured to latch the lever to the handle core so that the handle core, outer cover and lever can rotate as a unit when latched.
Further features, advantages and details of the present invention will be appreciated by those of ordinary skill in the art from a reading of the figures and the detailed description of the preferred embodiments that follow, such description being merely illustrative of the present invention.
It is noted that aspects of the invention described with respect to one embodiment, may be incorporated in a different embodiment although not specifically described relative thereto. That is, all embodiments and/or features of any embodiment can be combined in any way and/or combination. Applicant reserves the right to change any originally filed claim or file any new claim accordingly, including the right to be able to amend any originally filed claim to depend from and/or incorporate any feature of any other claim although not originally claimed in that manner. These and other objects and/or aspects of the present invention are explained in detail in the specification set forth below.
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which illustrative embodiments of the invention are shown. Like numbers refer to like elements and different embodiments of like elements can be designated using a different number of superscript indicator apostrophes (e.g., 10, 10′, 10″, 10′″).
In the drawings, the relative sizes of regions or features may be exaggerated for clarity. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The term “Fig.” is an abbreviation of the word “Figure” and each can be used interchangeably in the application (in the drawings and in the text of the specification).
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
Spatially relative terms, such as “beneath”, “below”, “lower”, “above”, “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90° or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The term “about” refers to numbers in a range of +/−20% of the noted value.
As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless expressly stated otherwise. It will be further understood that the terms “includes,” “comprises,” “including” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being “connected” or “coupled” to another element, it can be directly connected or coupled to the other element or intervening elements may be present. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The terms “disconnect operating handle”, “disconnect operator handle”, “disconnect handle” and “operating mechanism handle” are used interchangeably and refer to a user accessible handle, typically mounted on an exterior of an enclosure, that is connected to an internal disconnect operator (also interchangeable called an “operator mechanism”) and are used interchangeably. The disconnect operator or operating handle refer to a handle connected to an assembly for opening and closing separable main contacts in a circuit breaker or for turning power ON and OFF using a switch associated with a fuse. The circuit breaker can be for a motor starter unit or feeder unit, for example.
The term “Tagout and Lockout” refers to a padlocked or otherwise external lock applied to the disconnect operator handle to physically lock the circuit breaker using a lock such as a padlock in a visually apparent manner to comply with safety guidelines, such as National Fire Protection Association (NFPA) standards 70 National Electrical Code (NFPA70E).
The terms “bucket assembly”, bucket” and “unit” are used interchangeably and refer to a structure (typically a protective metal shell) that contains either a fuse or a circuit breaker for turning power ON and OFF to a motor, or feeder circuit, typically for controlling power to motor starters. As is well known, the bucket can be, for example, a feeder unit or a starter unit. The bucket assembly can include other components such as a power transformer, a motor starter to control a single motor and PLCs (programmable logic controllers), drives and the like. The bucket assembly can be configured as a modular device to allow the internal components to be assembled as a unit that can be easily installed into a Motor Control Center (MCC) compartment. As is well known, the bucket can have “power stabs” in the back that connect to vertical bus bars that carry power (current) to the compartments of a vertical section in an MCC cabinet. The vertical bus bars are connected to the larger horizontal bus bars that bring power to the vertical sections. The horizontal bus bars are usually in the top, but some MCC designs may have them in the center or bottom. The MCCs usually have a wire way for wires to the motors and other loads and control wires.
MCCs can be configured in many ways. Each compartment can have a different height to accept different frame sizes of respective bucket assemblies or units, typically in about 6-inch increments. The vertical bus can be omitted or not run through the full height of the section to accommodate deeper buckets for larger items like variable frequency drives. The MCC can be a modular cabinet system for powering and controlling motors or feeder circuits. Several may be powered from main switchgear which, in turn, gets its power from a transformer attached to the incoming line from the power company.
A typical MCC cabinet is an enclosure with a number of small doors arranged in rows and columns along the front and flat, mostly featureless, back and sides. The buckets can be provided in varying sizes. For starter units, the size can be based on the size of the motor they are controlling. The bucket assembly can be configured to be relatively easily removable for repair, service or replacement. MCCs can have, for example, regular starters, reversing starters, soft start, and variable frequency drives. MCCs can be configured so that sections can be added for expansion if needed.
The term “compact” refers to bucket units (also known as buckets) in a very condensed configuration (package) relative to conventional units/buckets. The MCC structure or cabinet 100 (
Referring now to the figures,
The lever 20 is configured to facilitate ease of operation of a user so as to be able to operate the handle 10 in one gloved hand and padlock the handle with the other hand or single-handedly. The handle 10 has an interlock configuration that allows the user to press the raised lockout lever 20 inward over the rear end portion of the lever 20r (on the right side of the pivot, away from the front end portion 201) before the handle 10 can be rotated from OFF to ON, for example, in normal operation. Once out of the lock orientation with the base 40, the base has a closed surface at the radial distance associated with the interlock or “lockout” pin 65 so that is retains the lever end 65e above the base, thereby compressing the resilient member 60 and keeping the lever 20 in a configuration with the lock passage 25 inside the handle 10 (under the cover 30).
The handle 10 can have an optional feature that a site may desire, typically provided as field or site-installation customer modification option, where a user must also press the raised lockout lever 20 before the handle can be rotated from ON to OFF. This optional feature can be provided using a knockout 40k in the base 40 (
The cover and lever 30, 20, rotate together with respect to the base 40 over a defined angular rotation between different operational positions of ON, TRIP, OFF and, optionally, also RESET. The handle 10 can have position detents for providing tactile feedback to the user for all three handle operating positions, ON, OFF and TRIP.
The visual indicia 41i and 42 for the ON position can be in red, for the TRIP position may be in yellow, for the OFF position may be in green and for the RESET position may be in white.
The text 41t where used can be provided in multiple concurrent different languages on the handle 10. The base 40 may be in a contrasting or different color such as dark grey or black. The operational positions may be indicated with different colors than those indicated. The cover 30 can be in yet a different color from the base 40 and the indicia 41i, 42. In some embodiments, the cover 30 may be provided in blue. The cover 30 can be provided in more than one color depending on application or target end use.
The cover 30 can have a projection 32 that resides in front to the lever 20 and aligns with the various operational positions to indicate status of the circuit breaker.
The lever 20 can have two operational configurations with respect to the cover 30: a first configuration where the entire lever 20 is substantially (or totally) flush with the upper surface of the cover or slightly recessed in the cover channel 35; and a second configuration, where the front end portion 20f of the lever pivots inward a small distance into the cover 30, and the opposing end portion 20r pivots outward to expose the lock passage 25.
The lever 20 can be configured so that the rear end 20r automatically “pops” out and/or projects out of the cover channel 35 when the lever 20 is depressed (pressed inward) by a user. The rear end of the lever 20r with the lock passage 25 can be held in the cover 30 and biased to project or pivot outward when a user presses against the lever 20 at a location that is left of the pivot (spaced apart from the rear end portion 20r), typically at a medial to front end portion 20f of the lever. Although not shown, the handle 10 may also alternatively be configured in the reverse, e.g., so that the front end portion of the lever “pops” out by reversing the configuration of the underlying components.
The lever 20 can include visual indicia 20i of one or more icons and/or text providing user input on how to operate the lever, e.g., “push to operate”, “press to operate”, “press to rotate”, “press to turn on”, “lock” and “unlock” and the like. This indicator 20i can reside on a front end to medial portion of the lever 20 as shown. The rear end portion of the lever 20r may optionally have ribs or surface features 20g, shown as having alternating parallel channels and valleys, for facilitating user contact grip and/or increased sliding friction.
In some embodiments as shown in
The base 40 can include a wall 40w with visual indicia 41i of operational position of the handle 10 with respect to the circuit breaker. The visual indicia 41i can include text or icons representing each operational position of the circuit breaker, e.g., ON, TRIP, OFF, RESET. The visual indicia 41i can be in different colors with different text representing each position. The base can include a ledge 40l with corresponding color coded segments 42 representing the respective operational position and/or the aligned positional text 41t.
Referring again to
Referring to
The core 44 can have an aperture 44a as shown in
In some embodiments, the upper surface 44u also includes a resilient member retention feature 44s shown as a circular channel in the lever channel 44c.
The channel 44c can have floor that is substantially flat 44f (right of the pivot as shown in
As shown in
The light source can be configured to be selectively illuminated, such as, for example, when the handle 10 is in the TRIP position.
In some embodiments, the cover 45 and base 40 can include light path apertures specifically positioned to align with the light guide 29g in TRIP, OFF & RESET positions and blocked on the ON position. However, in other embodiments, different colors can be transmitted to the light guide 29g depending on an operational condition using different color sources not blocking the light path from the source for any position. For example, the ON is not blocked and the LED color is different for each position, e.g., RED for ON, YELLOW for TRIPPED and GREEN for OFF. Other color-condition combinations may be selected or used.
In some embodiments, the bucket assembly 110 can comprise a molded case circuit breaker. Molded case circuit breakers are well known to those of skill in the art, as exemplified by U.S. Pat. Nos. 4,503,408 and 5,910,760, the contents of which are incorporated herein by reference as if recited in full herein. In other embodiments, the bucket assembly 10 can be configured to house a fuse disconnect with a fuse disconnect switch to turn power on and off. In some embodiments, as shown in
As is known by those of skill in the art, the unit 110 can include an internal operator disconnect mechanism 130 that is attached to the shaft 125 that is held by the shaft holder 46 of the rotary handle 10. In operation, the orientation of the lever 20 of the rotary handle 10 can provide a visual indication of the conduction status of the operator disconnect, e.g., breaker 160 (
As discussed above, the handle 10 rotates between different operative and defined positions, e.g., ON/RESET/OFF positions.
The handle 10 can be configured to have sufficient rotational torque so that when the rotating handle 10 with the padlocking lever 20, the handle 10 can toggle to and from each position, typically with a slight snap action. The on-board toggle-assist mechanism 165 can prevent the handle 20 from stalling when a unit or bucket with a breaker is tripped, particularly where a trip assist spring in the unit itself (where used) may not be strong enough to reliably cause the proper movement, and/or can facilitate desired rotational movement between operative positions.
As noted above, the handle 10 can be configured without requiring the “pop-out” lever spring 60 under the rear of the lever 20 as described above for some embodiments. The toggle-assist mechanism 165 can alternatively or additionally include a resilient member 160 that can push open the lever 20 to provide external access to the padlock portal 25 and that can angularly flex to provide rotational torque to facilitate movement between operative positions.
Referring now to
The resilient member 160 can be held in a cavity 144 in the core 44 and can reside under the pivot attachment 28 of the lever 20. The resilient member 160 can be held trapped between the lever 20 and the cavity 144 and can both compress and extend and flex side-to-side in the cavity 144 to angularly flex to take on different shapes as the handle 10 rotates and provide rotational torque to assist movement between one or more operative positions.
The resilient member 160 can comprise one or more of a flexible solid or hollow elastic plug, block or other shaped elastic members, O-rings, stacked dome or spring washers, Belleville washers, coil springs, leaf springs, and the like and combinations of the above.
The toggle-assist mechanism 165 can include a leg 166 (as an outer anchor) that extends inward (shown as down in the orientation shown in
The leg 166 can pivot or remain in a static position as the lever 20 moves between the extended (
The resilient member 160 can be pre-loaded at assembly to have a compressed shape in the cavity 144, whether the lever 20 is extended (
The resilient member 160 is not required to be physically attached to the leg 166 or the cavity protrusion 145, but is trapped under the lever 20 with one or both opposing outer ends allowed to angularly flex sufficiently enough to provide rotational torque to allow the rotating padlocking lever to toggle to and from each position with a slight snap action (which can typically be manually felt via a tactile response to a user).
However, as noted above, in some embodiments, the lever 20 may operate without requiring the resilient member 60 under the rear end portion of the lever 20 with the toggle-assist mechanism 165 and/or may use both resilient members 60, 160 (
In some embodiments, the cavity 144 is not required to have the protrusion and the leg 166 can be configured in other manners.
The magnetic latches 175 can be used with any of the embodiments shown and/or described herein.
In some embodiments, as shown in
Also, the spring 160 can be configured to be positioned to the left or right of the pivot 28, rather than directly under the pivot 28, but to the left or inside of interlock 65.
In some embodiments, the resilient member 160, e.g., spring, can be configured to reside between the pivot 28 and the padlock portal 25 and this placement can allow the resilient member 160 to act in a similar or same manner as the spring 60.
In some embodiments, where a magnetic latch 175 is used, the spring 160 can hold the padlock portal 25 open and the magnet latch 175 can latch it closed.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof. Although a few exemplary embodiments of this invention have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention. Therefore, it is to be understood that the foregoing is illustrative of the present invention and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the invention.
This application is a continuation of U.S. patent application Ser. No. 14/524,585, filed Oct. 27, 2014, which is a continuation-in-part of U.S. patent application Ser. No. 14/174,481, filed Feb. 6, 2014, the contents of which are hereby incorporated by reference as if recited in full herein.
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|---|---|---|---|
| 20170032906 A1 | Feb 2017 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 14524585 | Oct 2014 | US |
| Child | 15289435 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 14174481 | Feb 2014 | US |
| Child | 14524585 | US |
