Patent Grant
10892113
This application claims the benefit of BR Patent Application Serial No. 10 2017 017485-9 filed on 15 Aug. 2017, the benefit of the earlier filing date of which is hereby claimed under 35 USC § 119(a)-(d) and (f). The entire contents and substance of the application is hereby incorporated by reference.
The present invention relates generally to rotary handle devices, and more particularly to rotating handle devices useful in operating a molded case circuit breaker, a motor circuit breaker, and a switch-disconnector, among others, mounted on the door of an electric protection cabinet.
Several types of mechanisms and handles with different shapes and mounting techniques for operation of electric equipment through electric switches are known in the conventional state of the art, more specifically rotary handle devices including functions “ON”, “OFF”, “LOCK”, “TRIP” and “RESET” as their main functions.
The competitiveness of the current global market urges industries to manufacture end products with the lowest possible cost. Screws are safe and reliable elements for mechanical fastening. However, screw-based fastening is expensive since it requires additional devices and is time consuming, and further needs a specific area of mounting when compared to, for example, pressure fastening engagements (snap-fits). Therefore, products that do not include screws tend to be less expensive and easier to manufacture, which are intrinsic factors to the competitiveness in the industry.
Rotary handles for operation of a circuit breaker are known. A constructive example is disclosed in BRPI0900074-7, according to which the rotary handle for operating a circuit breaker comprises a housing for a rod to be used in a panel door where, through the rod, the handle installed on the door mechanically communicates with the circuit breaker inside the panel. The handle includes a button having a rotation locking pin on a rod locking trigger pin, for use with a pad-lock or similar device.
GB2180098B discloses a method of providing fastening through a pressure pin from an intermediate rotating member to an intermediate bracket.
DE9320753U1, on the other hand, discloses a handle including quick fastening devices, but without a blocking or position locking feature for the handle.
Conventional pad-locking rotating handles or similar devices, for fastening on doors or cases, include among other features elements fastened by pins or clamps (DE3901260A1), or screws (EP0774766A1 and EP2306480B1).
Several exemplary means are available, developed for fastening the mounting itself, however, the constant search for improvement has encouraged evolution for some unsolved issues in the state of the art.
Briefly described, in a preferred form, the present invention comprises a rotary handle device comprising the mounting of an assembly, comprising externally (to a user), a grip that receives a sliding button, the grip rotates while connected to an attachment base, and comprising, internally (to a user), a sliding limiting drive member and an fixing cover mounted to the attachment base, among other components, wherein the assembly comprises, in its external and internal facing components, for fastening between sliding button, grip, attachment base and fixing cover, only pressure fastening engagements for closing the assembly.
A mounting or dismounting between grip and attachment base may only takes place when the flap and the recession are coincided.
The grip can comprise a guide groove for movement of the sliding button, through the pressure fastening engagement.
The grip can comprise a groove and flaps with different dimensions between each other.
The grip can comprise a cruciform-shaped coupling cavity.
The attachment base can comprise a passing hole and recessions with different dimensions between each other.
The sliding limiting drive member can allow coupling of the pin of the sliding button on the “OFF” operating position at the passing hole and allow locking in the “ON” position of the pin of the sliding button at the optional blocking hole.
The assembly of the rotary handle device can be added by the complementary steering guide of the cruciform-shaped latch.
Briefly described, in another preferred form, the present invention comprises a mounting method for rotary handle device comprising introduction of the grip in the base externally (to a user), from a cylindrical ring of the grip and the flap, at the recession of the base until the support base touches the ring, twisting the previously introduced grip until the “OFF” position, where the hole coincides with the seat, when mounted between each other, introduction of the sliding button in the cavity of the grip, until the pressure fastening engagement reaches the guide groove of the grip, and one of the objectives of the invention is to provide a rotary handle for operate a circuit breaker, whose attachment of elements does not use screws.
Another objective of the invention is to provide a simplified assembly rotary handle that is able to block activation of a circuit breaker.
It is also an objective of the invention to provide a rotary handle for operate a circuit breaker with reduced number of components, compared to other assemblies of the state of the art.
Another objective of the invention is to provide a rotary handle that enables configuration for transferring the rotating grip movement to a motion transferring mechanism, mounted on a molded case circuit breaker, in order to drive the linear handle of the circuit breaker, or mounted onto a motor circuit breaker, directly to its drive shaft, by its own mechanism and a drive rod, which is coupled with the rotating handle at the protection panel door.
Another objective of the invention is to provide a safety block mean for the door of a protection panel, preventing the door from being opened when a circuit breaker device is in the “ON” position.
Another objective of the invention is to enable, through a lock or padlock mean, can be possible blocking of the handle in its “OFF” position, for example.
Briefly described, in another preferred form, the present invention comprises a rotary handle device comprising a grip having a first end and a second end, a sliding button having a first end and a second end, wherein the second end of the sliding button is received within the first end of the grip, an attachment base having a first end and a second end, wherein the second end of the grip is rotatably connected in proximity to the first end of the attachment base, and wherein the grip is rotatable while rotatably connected to the attachment base, a sliding limiting drive member located within the attachment base, a fixing cover mounted in proximity to the second end of the attachment base, and pressure fastening engagements snap-fits, wherein the grip is releasably mountable to the attachment base, and wherein the grip, sliding button, attachment base and fixing member are engagingly communicative to one another to form the rotary handle device via the pressure fastening engagements snap-fits.
The grip, sliding button, attachment base and fixing member can be engagingly communicative to one another to form the rotary handle device only via the pressure fastening engagements snap-fits.
The grip can comprise a guide assembly groove, wherein the sliding button comprises one of the pressure fastening engagements snap-fits, and wherein the guide assembly groove is for movement guiding of the pressure fastening engagements snap-fit of the sliding button.
The grip can comprise a first flap radially spaced apart from a second flap, each in proximity to the second end of the grip, wherein the attachment base comprises a first passing recession radially spaced apart from a second passing recession, each in proximity to the second end of the attachment base, wherein the first flap and the first passing recession are sized such that the first flap can move through the first passing recession when cooperative aligned, wherein the second flap and the second passing recession are sized such that the second flap can move through the second passing recession when cooperative aligned, and wherein only during cooperative alignment of the respective flaps of the grip to the corresponding respective passing recessions of the attachment base can the grip be mounted to, and released from, the attachment base.
The first flap and second flap can different in respect to at least one of size and shape such that at least one of: the first flap can move through the first passing recession when cooperative aligned with the first passing recession, and cannot move through the second passing recession when otherwise cooperative aligned with the second passing recession, and the second flap can move through the second passing recession when cooperative aligned with the second passing recession, and cannot move through the first passing recession when otherwise cooperative aligned with the first passing recession.
The first flap and second flap can be of such similarity in respect to size and shape that first flap can move through either the first or second passing recession when cooperative aligned with one of them, and the second flap can move through the other of the first or second passing recession when cooperative aligned with the other one of them.
The rotary handle device can have at least two operating positions “OFF” and “ON” reached via rotational movement of the grip, wherein the sliding button comprises a trigger pin, wherein the sliding limiting drive member a passing hole and a blocking hole, wherein in the “OFF” operating position, the sliding limiting drive member allows coupling of the trigger pin of the sliding button at the passing hole, and wherein in the “ON” operating position, the sliding limiting drive member allows locking of the trigger pin of the sliding button at the blocking hole.
The rotary handle device can further comprise a complementary steering guide, and a cruciform-shaped latch.
The grip can further comprise a cruciform-shaped coupling cavity, a cylindrical ring, and first and second passing holes, wherein the first and second flaps protrude from the cylindrical ring, and wherein the angle between the first flap and the first passing hole is 90°.
The attachment base can have a horizontal axis of symmetry and a vertical axis of symmetry and comprise a central orifice, first and second radially spaced apart rotary limiting members, a first positioning seat, a ribbed positioning seat, and a support ring, wherein the positioning seat is aligned to the horizontal axis of symmetry, wherein the angle between the first rotary limiting member and the first passing recession is less than 90°, and wherein the angle between the second rotary limiting member and the second passing recession is less than 90°.
Briefly described, in another preferred form, the present invention comprises a rotary handle device comprising a grip having a first end, a second end, a guide assembly groove, and a first flap radially spaced apart from a second flap each in proximity to the second end of the grip, a sliding button having a first end and a second end, wherein the second end of the sliding button is received within the first end of the grip, an attachment base having a first end, a second end, and a first passing recession radially spaced apart from a second passing recession each in proximity to the second end of the attachment base, wherein the second end of the grip is rotatably connected in proximity to the first end of the attachment base, and wherein the grip is rotatable while rotatably connected to the attachment base, a sliding limiting drive member located within the attachment base, a fixing cover mounted in proximity to the second end of the attachment base, and pressure fastening engagements snap-fits, wherein the grip is releasably mountable to the attachment base, wherein the grip, sliding button, attachment base and fixing member are engagingly communicative to one another to form the rotary handle device via only the pressure fastening engagements snap-fits, wherein the sliding button comprises one of the pressure fastening engagements snap-fits, wherein the guide assembly groove is for movement guiding of the pressure fastening engagements snap-fit of the sliding button, wherein the first flap and the first passing recession are sized such that the first flap can move through the first passing recession when cooperative aligned, wherein the second flap and the second passing recession are sized such that the second flap can move through the second passing recession when cooperative aligned, and wherein only during cooperative alignment of the respective flaps of the grip to the corresponding respective passing recessions of the attachment base can the grip be mounted to, and released from, the attachment base.
The rotary handle device can have at least two operating positions “OFF” and “ON” reached via rotational movement of the grip, wherein the sliding button comprises a trigger pin, wherein the sliding limiting drive member a passing hole and a blocking hole, wherein in the “OFF” operating position, the sliding limiting drive member allows coupling of the trigger pin of the sliding button at the passing hole, and wherein in the “ON” operating position, the sliding limiting drive member allows locking of the trigger pin of the sliding button at the blocking hole.
The rotary handle device can further comprise a complementary steering guide, and a cruciform-shaped latch.
The first flap and second flap can be different in respect to at least one of size and shape such that at least one of: the first flap can move through the first passing recession when cooperative aligned with the first passing recession, and cannot move through the second passing recession when otherwise cooperative aligned with the second passing recession, and the second flap can move through the second passing recession when cooperative aligned with the second passing recession, and cannot move through the first passing recession when otherwise cooperative aligned with the first passing recession.
The first flap and second flap can be of such similarity in respect to size and shape that first flap can move through either the first or second passing recession when cooperative aligned with one of them, and the second flap can move through the other of the first or second passing recession when cooperative aligned with the other one of them.
The grip can further comprise a cruciform-shaped coupling cavity, a cylindrical ring, and first and second passing holes, wherein the first and second flaps protrude from the cylindrical ring, and wherein the angle between the first flap and the first passing hole is 90°.
The attachment base can have a horizontal axis of symmetry and a vertical axis of symmetry and further comprise a central orifice, first and second radially spaced apart rotary limiting members, a first positioning seat, a ribbed positioning seat, and a support ring, wherein the positioning seat is aligned to the horizontal axis of symmetry, wherein the angle between the first rotary limiting member and the first passing recession is less than 90°, and wherein the angle between the second rotary limiting member and the second passing recession is less than 90°.
Briefly described, in another preferred form, the present invention comprises a method of forming one or more of the above rotary handle devices comprising introducing the grip into the attachment base from the cylindrical ring of the grip and the first and second flaps, at the first and second recessions of the attachment base until a support base of the grip touches the support ring, twisting the introduced grip until the “OFF” operating position, wherein one of the first and second passing holes coincide with the positioning seat when mounted between one another, and introducing the sliding button into the cruciform-shaped coupling cavity of the grip until the pressure fastening engagements snap-fit of the sliding button reaches the guide assembly groove of the grip.
These and other objects, features and advantages of the present invention will become more apparent upon reading the following specification in conjunction with the accompanying drawing figures.
To facilitate an understanding of the principles and features of the various embodiments of the invention, various illustrative embodiments are explained below. Although exemplary embodiments of the invention are explained in detail, it is to be understood that other embodiments are contemplated. Accordingly, it is not intended that the invention is limited in its scope to the details of construction and arrangement of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or carried out in various ways. Also, in describing exemplary embodiments, specific terminology will be resorted to for the sake of clarity.
It must also be noted that, as used in the specification and the appended claims, the singular forms “a,” “an” and “the” include plural references unless the context clearly dictates otherwise. For example, reference to a component is intended also to include composition of a plurality of components. References to a composition containing “a” constituent is intended to include other constituents in addition to the one named.
Also, in describing exemplary embodiments, terminology will be resorted to for the sake of clarity. It is intended that each term contemplates its broadest meaning as understood by those skilled in the art and includes all technical equivalents which operate in a similar manner to accomplish a similar purpose.
Ranges may be expressed herein as from “about” or “approximately” or “substantially” one particular value and/or to “about” or “approximately” or “substantially” another particular value. When such a range is expressed, other exemplary embodiments include from the one particular value and/or to the other particular value.
Similarly, as used herein, “substantially free” of something, or “substantially pure”, and like characterizations, can include both being “at least substantially free” of something, or “at least substantially pure”, and being “completely free” of something, or “completely pure”.
By “comprising” or “containing” or “including” is meant that at least the named compound, element, particle, or method step is present in the composition or article or method, but does not exclude the presence of other compounds, materials, particles, method steps, even if the other such compounds, material, particles, method steps have the same function as what is named.
It is also to be understood that the mention of one or more method steps does not preclude the presence of additional method steps or intervening method steps between those steps expressly identified. Similarly, it is also to be understood that the mention of one or more components in a composition does not preclude the presence of additional components than those expressly identified.
The materials described as making up the various elements of the invention are intended to be illustrative and not restrictive. Many suitable materials that would perform the same or a similar function as the materials described herein are intended to be embraced within the scope of the invention. Such other materials not described herein can include, but are not limited to, for example, materials that are developed after the time of the development of the invention.
As used herein, the present invention has internal components (not viewable to a user of the invention unless the invention is dissembled), and components that include at least a portion that are viewable by the user of the assembled invention. Sometimes herein components will be described as being internal, or at an internal side, or being of an internal portion of the invention, or other like descriptions to mean those above-defined internal components. Sometimes herein components will be described as being external, or at an external side, or being of an external portion of the invention, or other like descriptions to mean those above-defined external components.
As used herein, components of the present invention may have a first end and a second end. The first end is intended to mean the end of the component distal the mounting (or toward ultimately the sliding button), and the second end is intended to mean the end of the component proximal the mounting (or toward ultimately the fixing cover).
the present invention has internal components (not viewable to a user of the invention unless the invention is dissembled), and components that include at least a portion that are viewable by the user of the assembled invention. Sometimes herein components will be described as being internal, or at an internal side, or being of an internal portion of the invention, or other like descriptions to mean those above-defined internal components. Sometimes herein components will be described as being external, or at an external side, or being of an external portion of the invention, or other like descriptions to mean those above-defined external components.
The assembly 2 comprises a grip 4, a sliding button 5, an attachment base 6, a sliding limiting drive member 8, and a fixing cover 9. Externally, the grip 4 receives the sliding button 5. Sliding button 5 comprises an engagement flap 5b being assembled while fitted onto the attachment base 6, having a central orifice 6a, comprising internally (shown as an internal portion 7) the sliding limiting drive member 8 comprising a central hole 8a, and the fixing cover 9 mounted to the attachment base 6. The fixing cover 9 includes a cruciform-shaped central hole 9a.
The assembly 2 can further comprise a complementary steering guide 10, a cruciform-shaped latch 11, and extender rod 12. The cruciform-shaped latch 11 comprises a tooth 11a, the extender rod 12, and a return spring 8k. The assembly 2 of the rotary handle device 1 may be sealed against weathering, such as water, dust, and similar conditions, through sealants, seal ring 6b and elements 5a, 6c, 8c as disclosed hereinafter.
The rotary handle device 1 is mainly designed to operate a switching device, either for switching or sectioning (not shown), such as a molded case circuit breaker or a motor circuit breaker, through a motion transmission accessory. For example within a hinged door 13 of a cabinet (not shown), the rotary handle device 1 is capable of operating main functions such as “OFF” (better shown in
In its initial “OFF” position, the assembly 2 of the rotary handle device 1 features the cruciform-shaped latch 11 as shown in section view X-X of
In its optional “OFF LOCKED” position, the assembly 2 of the rotary handle device 1, shown in
During the pressure activation movement of the sliding button 5, to enable blocking of the rotary handle device 1 in the “OFF LOCKED” position, the sliding limiting drive member 8, in order to allow passage of the trigger pin 5d in an advanced position, with the movement being made easier by the translational guide seat 8l, better shown in
In its final “ON” position, the assembly 2 of the rotary handle device 1, better shown in
Under normal operating conditions, these are the main features advisable for safe operation of an electric protection panel cabinet. Exemplary “TRIPPED” or “RESET” operation states are not herein disclosed, being included in the state of the art and incorporated to the invention previously described in an optional manner, not in a fundamental or prohibitive manner.
Optionally, the rotary handle device 1 allows blocking in an “ON LOCKED” operating position (not shown) through the trigger pin 5d of the sliding button 5 on the optional blocking hole 8d, in which, through the teeth 8e of the sliding limiting drive member 8 (not shown in detail), prevents removal of the cruciform-shaped latch 11, in which the bearing pin 8g guides the cross-sectional movement of the sliding limiting drive member 8, comprising the seal notch 8h, related to the bearing hole 6k of the attachment base 6.
Also optionally, the bearing hole 6k of the attachment base 6 can be used in opening the panel door, under exceptional maintenance conditions in an “ON” position and can release the cruciform-shaped latch 11 from the teeth 8e. The sliding limiting drive member 8 moves when the bearing pin 8g is externally pressed through the bearing hole 6k of the attachment base 6 and the protruding rails 8i, related to the sliding rails 6m of the base guide 6 and the seating base 8j, to the return spring 8k.
In order to prevent blocking in the “ON” position, the assembly 2 of the rotary handle device 1 can be equipped with the ribbed positioning seat 6g at the attachment base 6 that prevents the position locking rod 5e of the sliding button 5 from lodging there, therefore preventing the sliding button 5 from advancing against the grip 4, thus not allowing opening of the lock element hole 4d for accommodating a lock, and subsequent blocking in this “ON” position.
For the operation modes to be successful when applied by the user, various types of devices were built in the state of the art, and the present invention in particular has culminated in the simplification of components involved in the mounting of the assembly 2 of the rotary handle device 1, regarding a quick and simplified mounting sequence.
The assembly 2, incorporating the aforementioned operation modes, is obtained in a sequential mounting, through pressure fastening engagements snap-fits between its components, comprising the attachment base 6 that on its external surface 3 receives the grip 4 and the sliding button 5, mounted onto the grip 4, having fixing through pressure fastening engagements snap-fits between components, comprising the grip 4, the blind hole 4o related to receiving the mounted settling pin 5c, and the rotation blocking passing hole 4b to receive mounted the trigger pin 5d of the position locking rod 5e of the sliding button 5, in order to carry out the “LOCK” function, the sliding button 5 is designed to slide longitudinally from the trigger pin 5d, with the axial movement of the sliding button 5, limited by the cavity 4g of the grip 4, that is related to the limiting bottom 5h, and the guide assembly groove 4e on the grip 4 related to retaining the pressure fastening engagements snap-fit 5g of the sliding button 5, assisted by the motion return spring 5f, which keeps the upper front face of the sliding button 5 in a resting position next to the edge of the grip 4, and when under pressure, limited to the contact the limiting bottom 5h with the cavity 4g of the grip 4, so that when performing the “LOCK” function, the sliding button 5 remains under pressure and limited to the contact with the limiting bottom 5h with the cavity 4g of the grip 4.
In order to provide smart attachment of the grip 4 onto the attachment base 6 poka-yoke, the attachment base 6, having the central orifice 6a and passing recessions 6b, 6c, in which the dimensions of the passing recession 6b are different from the passing recession 6c, provided in order to exclusively allow mounting or dismounting of the attachment base 6 in relation to the grip 4 when both flaps 4j, 4k, where the dimensions of flap 4j and flap 4k are different, and protruding from the cylindrical ring 4l of the grip 4, are coincidentally positioned regarding the passing recessions 6b, 6c, and simultaneously, the central orifice 6a, in order to allow mounting or dismounting between each other, the grip 4 is built so that the passing hole 4n is positioned at 90° from the flaps 4j, 4k.
The counterpart, namely the attachment base 6, does not allow proper positioning for dismounting when the position locking rod 5e of the sliding button 5 is included on the mounting between the attachment base 6 and grip 4, below the edge 6o of the attachment base 6, shown in
Viewed internally, the sliding limiting drive member 8, shown in
Finally, viewed internally, in order to complete the assembly 2 of the rotary handle device 1, the fixing cover 9 comprising the cruciform-shaped hole 9a in order to allow passage of the cruciform-shaped latch 11, passing engagement holes 9c of engaging the holes 6n at the attachment base 6, settling rails 9d, for contact with the sliding surfaces 8b of the sliding limiting drive member 8, pressure fastening engagements snap-fits 9e, for locking at the locking holes 6i of the attachment base 6, as well as guide bars 9f and the seating base 8j of the sliding limiting drive member 8, related to movement of the return spring 8k, in order to enable the blocking function of the cruciform-shaped latch 11.
The mounting of the assembly 2 comprises, from the external surface 3 (to a user), the attachment base 6 that receives the grip 4 and the sliding button 5, comprising the pressure fastening engagements snap-fit 5g, related to the guide assembly groove 4e and the assembly guide groove 4f for the pressure fastening engagements snap-fit 5g, when mounted to each other, to the grip 4 and sliding button 5, allowing movement on the groove between the grip 4 and the sliding button 5, in which between the external surface 3 and internal portion 7 for fastening between the sliding button 5, the grip 4, the attachment base 6 and the fixing cover 9, the pressure fastening engagements snap-fits 5g, 9e are used in order to close the assembly 2, where the pressure fastening engagements snap-fit 9e is positioned radially to the cruciform-shaped central hole 9a of the fixing cover 9, for engagement next to the locking holes 6i of the attachment base 6 for closure of the assembly 2, which provides, during use and manufacturing, an easier factory management, eliminating base support devices for possible tightening of screws, electric screw drivers and other accessories, specific mounting areas, that increase mounting operation investment costs, as well as time used in fastening components.
Additionally, the present invention also refers to a method for smart and sequential mounting, also known as “poka-yoke”, between the grip 4 and the attachment base 6 of the assembly 2 of the rotary handle device 1, the method comprising:
The mounting method prevents removal of the grip 4 from the attachment base 6, unless the sliding button 5 is removed first. This was provided through an exemplary angle of 90° between the flap 4j and the passing hole 4n, at the grip 4, the passing hole 4n coinciding with the passage of the position locking rod 5e of the sliding button 5, when mounted to the grip 4, is positioned below the edge 6o of the attachment base 6, so that the position locking rod 5e of the sliding button 5 is prevented from rotatably overcoming the rotary limiting member 6d, in which an exemplary angle α is less than 90°, defined between the rotary limiting member 6d and the passing recession 6b of the attachment base 6, thus preventing the flap 4j of the grip 4 from engaging the passing recession 6b upon dismounting, considering that when the sliding button 5 is at the cavity 4g of the grip 4, preventing the flaps 4j, 4k from freely rotary at any angle, through the rotary limiting members 6d, 6e. In addition, the flap 4j and the flap 4k have different dimensions from one another, while the mounting or dismounting between grip 4 and attachment base 6 may only take place upon the coincidence between the pairs of flaps 4j,4k and passing recessions 6b, 6c. This prevents mistakes in mounting on the method, providing smart and sequential mounting process, also known as “poka-yoke”, according to an exemplary embodiment of the present invention.
Optionally, the assembly 2 of the rotary handle device 1 can be sealed against weathering, such as water, dust, and similar conditions, through sealants, seal ring 6b and elements 5a, 6c, 8c.
Also optionally, the assembly 2 of the rotary handle device 1 can be added by the complementary steering guide 10 of the cruciform-shaped latch 11.
It should be evident that other modifications and variations applied to this invention are considered within the scope of the present invention.
Numerous characteristics and advantages have been set forth in the foregoing description, together with details of structure and function. While the invention has been disclosed in several forms, it will be apparent to those skilled in the art that many modifications, additions, and deletions, especially in matters of shape, size, and arrangement of parts, can be made therein without departing from the spirit and scope of the invention and its equivalents as set forth in the following claims. Therefore, other modifications or embodiments as may be suggested by the teachings herein are particularly reserved as they fall within the breadth and scope of the claims here appended.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102017017485 | Aug 2017 | BR | national |
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| Number | Date | Country |
|---|---|---|
| PI0900074 | Oct 2010 | BR |
| 9320753 | Apr 1995 | DE |
| 102013216088 | Feb 2015 | DE |
| 0564173 | Oct 1993 | EP |
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| Number | Date | Country | |
|---|---|---|---|
| 20190057820 A1 | Feb 2019 | US |
