Abstract:
A drone package receiving system is provided, utilizing a package-to-receiver system coupler that mates to a receiver pole. The coupler is attached to the drone package and “clips” onto the receiver pole to secure the package from the drone. The receiver pole is affixed to receptacle that is at a “customer-side” end of the pole, wherein the package is translated from the pole&#39;s end into the receptacle for safe and hands-free delivery to the customer.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
       [0001]    This application claims the benefit of and is a continuation of U.S. patent application Ser. No. 14/583,388 filed on Dec. 26, 2014, issuing as U.S. Pat. No. 9,714,087 on Jul. 25, 2017 which claimed the benefit of U.S. Provisional Patent Application No. 61/975,784, filed Apr. 5, 2014, the contents of which are hereby incorporated by reference in its entirety. 
     
    
     FIELD 
       [0002]    This invention relates to a winged multi-rotor flying craft. More particularly, to a control surfaceless multi-rotor craft with shiftable structures for accommodating larger payloads, as well as automated payload delivery. 
       BACKGROUND 
       [0003]    Much interest has been recently garnered in the field of aviation over the use and control systems of multi-rotor aircraft, specifically for miniature aircraft systems. Specifically, prior art multi-rotor aircraft provide lift and transition to level flight using a rotation of the engine-supporting nacelle (e.g., tilt-rotor) or attached wing and use elevator/rudder control for flight control. Tilting of the wing body (or nacelle) requires rotating assemblies and gearing; and elevator/rudder control requires additional hardware, all of which add to the weight and complexity of a multi-rotor aircraft. The added weight and complexity cannot but help increase the cost of such systems as well as introduce possible mechanical vulnerabilities. Further, all of these designs do not accommodate well the size of the payload, having no variability of the airframe for the payload. And currently there is no cogent paradigm for automating the safe delivery of payloads. 
         [0004]    Therefore, there has been a long-standing need in the aircraft community for designs that reduce the complexity and weight of multi-rotor aircraft as well as complementing the designs with secure payload delivery systems. Accordingly, new systems and methods addressing these and other needs are elucidated below. 
       SUMMARY 
       [0005]    The following presents a simplified summary in order to provide a basic understanding of some aspects of the claimed subject matter. This summary is not an extensive overview, and is not intended to identify key/critical elements or to delineate the scope of the claimed subject matter. Its purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later. 
         [0006]    In one aspect of the disclosed embodiments, a vertical takeoff/landing capable flying multi-engine aircraft without elevator or rudder surfaces is provided, comprising: at least one lifting airfoil without elevator or rudder surfaces, having strut apertures adapted to accommodate vertical translation and horizontal translation of the airfoil in reference to struts disposed through the apertures; engine supporting struts disposed through the apertures, opposite ends of the struts extending to opposite sides of the airfoil, wherein the struts are adjustably attached to the airfoil; a first plurality of engines attached to an end of the struts, wherein an attachment position of the first plurality of engines to the struts is horizontally adjustable; a second plurality of engines attached to an opposite end of the struts, wherein an attachment position of the second plurality of engines to the struts is horizontally adjustable; and a computerized engine controller, controlling respective thrusts of the first and second plurality of engines to enable the aircraft to vertically lift off/land and re-orient itself to horizontally fly, and perform thrust-initiated elevator and rudder emulating flight. 
         [0007]    In another aspect of the disclosed embodiments, the above aircraft is described, wherein the aircraft is a quadrarotor aircraft; and/or wherein the aircraft is a bi-plane aircraft; and/or wherein the airfoil further comprises removable or addable wing extensions; and/or further comprising an externally attached payload, attached to a bottom and center portion of the airfoil; and/or wherein the payload is attached to the airfoil at an incline to the airfoil&#39;s surface; and/or wherein the airfoil is translated prior to flight at least horizontally and vertically, to accommodate the payload; and/or wherein the first and second plurality of engines are shifted horizontally, prior to flight; and/or wherein the payload is a surveillance device; and/or further comprising an external payload-to-delivery system transfer mating mechanism, attached to a bottom of the payload. 
         [0008]    In yet another aspect of the disclosed embodiments, an automatic payload delivery system using an autonomous aircraft with a payload and a payload receiving receptacle is provided, comprising: a vertical takeoff/landing capable flying multi-engine aircraft without elevator or rudder surfaces, comprising: at least one lifting airfoil without elevator or rudder surfaces, having strut apertures adapted to accommodate vertical translation and horizontal translation of the airfoil in reference to struts disposed through the apertures; engine supporting struts disposed through the apertures, opposite ends of the struts extending to opposite sides of the airfoil, wherein the struts are adjustably attached to the airfoil; a first plurality of engines attached to an end of the struts, wherein an attachment position of the first plurality of engines to the struts is horizontally adjustable; and a second plurality of engines attached to an opposite end of the struts, wherein an attachment position of the second plurality of engines to the struts is horizontally adjustable; a computerized engine controller, controlling respective thrusts of the first and second plurality of engines to enable the aircraft to vertically lift off/land and re-orient itself to horizontally fly, and perform thrust-initiated elevator and rudder emulating flight; an externally attached payload, attached to a bottom and center portion of the airfoil; an external payload-to-delivery system transfer mating mechanism, attached to a bottom of the payload; a location assistance receiver in the aircraft, adapted to provide location accuracy and docking precision for the aircraft when transferring the payload to the delivery system. 
         [0009]    In other aspects of the disclosed embodiments, the automatic payload delivery system above is described, further comprising: a payload receptacle; a pole extending from an interior of the receptacle and rising above the receptacle; a payload cushion at a terminal end of the receptacle, to cushion the payload when entering the receptacle; a lockable receptacle door; and a location assistance transmitter attached to a top of the pole; and/or wherein the mating mechanism automatically releases the payload from the aircraft when the mating mechanism is attached to the pole; and/or wherein the location assistance receiver in the aircraft and the location assistance transmitter attached to the top of the pole utilize at least one of radio, optic, and sonic signals for mating the payload receptacle to the pole; and/or wherein the aircraft is a quadrarotor aircraft; and/or wherein the aircraft is a bi-plane aircraft; and/or wherein the airfoil further comprises removable or addable wing extensions; and/or wherein the payload is attached to the airfoil at an incline to the airfoil&#39;s surface; and/or wherein the airfoil is translated prior to flight at least horizontally and vertically, to accommodate the payload; and/or wherein the first and second plurality of engines are shifted horizontally, prior to flight. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]      FIGS. 1A-B  are side and perspective top view illustrations of a multi-rotor aircraft according to an exemplary embodiment. 
           [0011]      FIGS. 2A-B  are side and perspective top view illustrations of a multi-rotor aircraft, with airfoil engines shifted. 
           [0012]      FIGS. 3A-C  are illustrations of different orientations of an exemplary aircraft, during a takeoff or landing sequence. 
           [0013]      FIG. 4  is an illustration of an exemplary multiple airfoil aircraft. 
           [0014]      FIG. 5  is a closeup illustration of an exemplary package/payload delivery system. 
           [0015]      FIG. 6  is an illustration of an exemplary package/payload delivery system. 
           [0016]      FIG. 7  is an illustration of an exemplary package/payload delivery system. 
       
    
    
     DETAILED DESCRIPTION 
       [0017]    In the following description, the use of the term “engine” is understood to be synonymous with any propulsion producing system, capable of producing thrust or force via mechanical means, combustion means, reaction means, and so forth. Therefore, the term engine can refer to any one or more of a propeller-system, turbine-system, rocket-system and so forth. 
         [0018]    Various embodiments described herein use multi-engine thrust coordination (increase/decrease thrust of different engines) to provide yaw (roll) and pitch control of a winged, flight control surfaceless multi-engine aircraft. By using at least two separated “upper” engines above the main wing and at least two separated engines below the main wing, via changing thrust ratios of the respective engines, a thrust-induced yaw and pitch can be produced for flight control, as well as producing the necessary flight forces for transitioning from vertical to horizontal flight or vice versus. Further, the exemplary airframe is configured with a “translatable” lift body (e.g., wing) and/or translatable engines, to allow large or small payloads to be easily accommodated, recognizing the payload will be substantially exterior to the airframe and otherwise interfere with typical airframe structures. Accordingly, various embodiments described have applications for package delivery, search and rescue, surveillance, and so forth. Additionally, these aircraft can be networked together for coordinated flight. Aspects of these and other concepts are detailed in the description of the drawings presented below. 
         [0019]      FIGS. 1A-B  are side and perspective top view illustrations of a multi-rotor aircraft  105  according to an exemplary embodiment described herein. An airfoil  110  is presented with a first set of thrust producing engines  120   a ,  120   b  positioned over a given side (shown here as “above”) of the airfoil  110 , and a second set of thrust producing engines  130   b ,  130   b  positioned over the other side (shown here as “below”) of the airfoil  110 . Airfoil  110  is a wing with no significant flight control surfaces. That is, no elevator (for pitch) or rudder (for yaw) is used in airfoil  110 . 
         [0020]    For the purposes of explaining flight operation in an exemplary embodiment, presuming engine pairs  120   a,b  are operating in concert with engine pairs  130   a,b , and the aircraft  105  is in level flight, then if the thrust of engines  120   a,b  is changed relative to engines  130   a,b , then the resulting force differential will produce a pitch effect on airfoil  110 —resulting in alternating the attack angle of the airfoil  110 , causing aircraft  105  to fly angled upward or downward. For example, if the thrust of lower engine pairs  130   a,b  is greater than engine pairs  120   a,b , then the aircraft  105  will angle upwards and the flight vector will rotate upwards. Alternatively, if the thrust of upper engine pairs  120   a,b  is greater than engine pairs  130   a,b , then the aircraft  105  will angle downwards and the flight vector will rotate downwards. Thus, the equivalent to elevator control surface flight can be achieved, without an actual elevator control surface. 
         [0021]    Accordingly, using the appropriate thrusting of engines, the aircraft  105 , sitting vertically in a “landed” orientation with either the rear of the engines pairs  120   a,b  or rear of airfoil  110  operating as landing supports (not shown), can lift off using equal thrust for all engines and then by adjusting the appropriate engines, reorient itself from vertical flight to horizontal flight, thus accomplishing takeoff to horizontal flight orientation. An example of this is seen in  FIGS. 3A-C . Of course, landing (transitioning from horizontal flight to vertical/landing orientation) is accomplished in reverse. Thus, the exemplary aircraft can launch vertically like a helicopter, fly horizontally like an airplane and then land vertically like a helicopter. Once the exemplary aircraft is in horizontal flight mode, the thrust could be reduced to maintain airfoil-lift predominate flight, thus reducing the expended energy. 
         [0022]    For rudder vectoring, for example, if engine pairs  120   a  and  130   a  have different thrusts as compared to opposing engine pairs  120   b  and  130   b , then a yawing force vector will be generated to cause the aircraft  105  to turn left or right. Similarly, for roll vectoring, for example, if a single engine  120   a  ( 130   b ) has a larger/lower thrust than the other engines, then the aircraft  105 &#39;s airfoil  110  will roll accordingly. Engine thrust control is accomplished through a computer or controller (not shown) in the aircraft  105 . Since flight control will be via computer control of engine thrust, mechanical complexity will be significantly reduced, as well as “only” having the engines as the point of failure, rather than all the other associated systems typically found in conventional aircraft. By using the exemplary thrust control, these prior art systems could be made significantly cheaper, weigh less and the space allocated for the prior art mechanical systems could be allocated for the payload. 
         [0023]    While the embodiments described herein are in the context of a four (4) engine aircraft, more than four engines may be used, according to design preference. Further, other aspects of flight vectoring are well understood in the art, therefore additional details, changes, modifications to the embodiments described are within the scope of one of ordinary skill in the art and this disclosure. 
         [0024]    The above exemplary configuration is especially interesting in view of the current deluge of prior art quadrarotor drones that are being examined for commercial use. Such prior art systems require movable control surfaces such as an elevator and/or rudder, which inherently require additional mechanical systems, thereby significantly increasing the costs of the system. It is also understood that commercial or commercially sought multi-rotor designs are being contemplated for package (or payload) delivery to individual locations. In essence, as a “personal” courier vehicle. Accordingly, the traditional quadrarotor craft must accommodate the package, which will likely be similar in shape and size to mail delivery packages. But traditional quadrarotor craft (that are “delivery” sized) do not accommodate well larger packages, which interfere with the structures of the airfoil, engines, etc. 
         [0025]      FIGS. 2A-B  are side and perspective top view illustrations of a multi-rotor aircraft  205  according to an exemplary embodiment described herein, with airfoil  210  and engines  220   a,b  or  230   a,b  shifted. The airfoil  210  contains strut apertures  208  adapted to accommodate vertical translation and horizontal translation of the airfoil  210  in reference to engine struts  250 . Airfoil  210  can be elevated or lowered along struts  230  and fixed at this relocated position, to allow more separation space between the airfoil  210  and a given engine pair  220   a,b  or  230   a,b . Also, airfoil  210  can be shifted forward and aft within these airfoil apertures  208 . The added separation space can allow for payload  225  that would not normally fit in a mid-airfoil configuration. Thus, instead of requiring a larger quadrarotor aircraft for delivery of larger payloads, the exemplary aircraft  205  can be modified to accommodate the larger payload  225 . Of course, altering the airfoil  210  vertical and/or horizontal position will alter the flight characteristics of the aircraft  205 . However, it is understood that the unbalancing effects can be compensated by appropriate thrust control of the engines and/or repositioning of the engines, as described below. 
         [0026]    In addition to having the airfoil  210  relocatable or shiftable along the vertical and horizontal axes of engine struts  250 , the engines  220   a,b ,  230   a,b  themselves may also be relocatable or shiftable along the horizontal axes of the engine struts  250 . That is, engines  220   a,b ,  230   a,b  may shift forward or aft, as needed. The engine relocation allows for rebalancing of the aircraft  205  in view of the altered airfoil  210  position for the payload  260 , as well as allowing more room for the larger payload  225 , if needed. Additionally, a heavy payload can be compensated for by adjusting the engines&#39; positions to better balance the aircraft&#39;s  205  center of gravity over the airfoil  210 , for better performing flight. In this  FIGS. 2A-B , the symbol “Y” is presented to illustrate the amount of extra space made available by shifting the airfoil  210  upwards along engine struts  250 . The symbol “X” represents the shifted amount of engines  220 , b ,  230   a,b  from their normal position. It should be noted that airfoil  210  is also forward shifted by an amount similar to “X”, so as to better balance load  225 . 
         [0027]    It should be understood that while the Figs. show the payload  225  below the airfoil  210 , it may be desirable to have the payload  225  “above” the airfoil  210 . For some implementations, multiple payloads  225  (above and below the airfoil  210 , for example) are contemplated. 
         [0028]    Recognizing the inherent ability to “move” or shift the airfoil  210  within aircraft  205 , for situations where the additional weight of the payload, flight distance required, etc. requires a larger lifting airfoil, various exemplary embodiments may include the ability to easily remove the airfoil  210  from the aircraft  205  and replace it with a larger or longer airfoil. Thus, a separable airfoil  210  that can be easily dismembered from the struts  250  is contemplated. Conversely, the struts  250  may be dismemberable so as to allow airfoil  210  to be separated therefrom. 
         [0029]    For example, seams  280  in the airfoil  210  may operate as joining surfaces for outmost left and right sections of the airfoil  210 , wherein the center section  215  of airfoil  210  may be the “payload” attaching part, with the outer sections  212  of airfoil  210  being of customizable lengths. Thus, a longer (or shorter) wingspan airfoil  210  can be obtained by attaching the appropriately sized outer sections  212 . 
         [0030]    The mechanisms to multiply-attach, remove, separate parts of the airfoil  210  and/or struts  250  and/or move the airfoil  210 /engines  220   a,b ,  230   a,b , to obtain the abilities described above generally involve simple mechanical attachment technology, which are well within the purview of one of ordinary skill in the mechanical arts. Accordingly, the details of the different attachment/removal schemes are not elaborated, understating that they are within the scope of one of ordinary skill and this disclosure. 
         [0031]      FIGS. 3A-C  are illustrations of different orientations of an exemplary aircraft  305  with shifted wing, during a takeoff or landing sequence. The aspects of  FIGS. 3A-C  are self-evident in view of the foregoing discussion, therefore no further elaboration is provided. 
         [0032]      FIG. 4  is an illustration  400  of an exemplary embodiment of an aircraft  405  with multiple airfoils  410   a,b  supported by struts  450 . This embodiment contemplates the need for an extra airfoil for additional lift in situations where a large wingspan is not appropriate (or for multiple payloads, each connected to a different airfoil). The similar ability for the airfoils  410   a,b  to be relocatable or shiftable along the vertical and horizontal axes of engine struts  450 , and the relocatable/shiftable engines as discussed above, can be implemented herein. Any package or payload can be placed “between” the airfoils  410   a,b , or above or below one of them, according to design preference. In some embodiments, the ability to extend the length of the airfoils  410   a  and/or  410   b  may be accommodated, by attaching extension segments. While  FIG. 4  illustrates two airfoils, it is possible to have more than two (tri-plane), if so desired. 
         [0033]      FIG. 5  is a closeup illustration  500  of an exemplary package/payload delivery system, in accordance with the aircraft embodiments described above. Aircraft  505  contains a payload  525  with a “pole grabber”  560  attached to an exterior of the payload  525 . The pole grabber  560  is configured to have a clip-like center catch that is wide enough to attach to pole  585 , via simple pressure attachment or other mechanical means. Upon attachment, the payload  525  is released from aircraft  505  and the payload  525  being coupled to pole  585  via pole grabber  560 , slides down pole  585  to its destination. A metal, nylon, polypropylene, plastic, or rubber constructed pole grabber  560  may be used, as well as any other type of material or shape that accommodates attachment to pole  585 , while allowing the pole grabber  560  to slide on pole  585 . In some embodiments, pole grabber  560  may simply be an open ring or loop that slides over the “top” of pole  585 . Also, one or more pole grabbers  560  may be used, according to design preference. 
         [0034]    The pole grabber  560  may have a triggering mechanism that, when coupled to the pole  585 , releases the payload  525  from the aircraft  505 . The triggering mechanism can be a “releasable catch” of some sort, spring, lever, pressure or other associated releasing mechanism. In the simplest embodiment, payload  525  may be released simply with the application of sufficient releasing force to break payload  525  from the aircraft&#39;s  505  airfoil  510 , the payload  525  being attached thereto via some pressure/force-sensitive mechanism. In some embodiments, the end of pole  585  is configured with a stop/antenna  570 , that prevents pole grabber  560  from proceeding upward past stop/antenna  570 . In this event, the upward motion of aircraft  505  with pole grabber  560 , constrained by stop/antenna  570 , may provide sufficient force to cause payload  525  to “slide” off its payload-to-aircraft  505  attachment mechanism, thus allowing payload  525  to separate from aircraft  505 . 
         [0035]    It should be apparent that many methods, schemes, designs can be contemplated for facilitating the dis-engagement of an item (payload) “attached” to supported base (aircraft), therefore these alternative approaches are understood to be within the purview of one of ordinary skill and also within the scope of this disclosure. 
         [0036]    In some embodiments, stop/antenna  570  may simply be an antenna, or include an antenna. For example, recognizing that coordinating aircraft  505  to “push” pole grabber  560  to pole  585  requires extreme flying precision, which is not possible using GPS coordinate maneuvering. Thus, to facilitate the pole grabber  560  to pole  585  transfer process, the delivery mating system can utilize a radio or wireless transmitter with an antenna located in stop/antenna  570  (noting that in some embodiments, the stop/antenna  570  functions actually as an antenna rather than a stop). The stop/antenna  570  provides a proximity location signal to aircraft  505 , which is configured with a radio/wireless receiver with antenna  580 , to receive the proximity signal. Several antennas  580  may be used, according to design preference. Similarly, several antennas may be used in stop/antenna  570 . One or more of these antennas may be a phase array, changing beam width, as needed, for precision coordination of the payload  525  transfer. 
         [0037]    In operation, for example, aircraft  505  may arrive at the general delivery coordinates using GPS or other navigation system, but since GPS or other navigation systems do not provide the needed precision for point-to-point attachment, the proximity signal provides the needed accuracy. While these embodiments describe an “antenna” means for precise coordination, it is understood that other mechanisms may be utilized without departing from the spirit and scope of this disclosure. For example, an infrared, sonic, optical, other system may be used for “final” approach or “docking” coordination. 
         [0038]      FIG. 6  is an illustration  600  of an exemplary package/payload delivery system, in accordance with the aircraft embodiments described above, showing the pole  585  leading to a mailbox  665  or other secure payload-securing container. Mailbox  665  can be disposed outside a person&#39;s apartment/condo/dwelling/office. Aspects of this Fig. are self-explanatory. 
         [0039]      FIG. 7  is an illustration  700  of an exemplary package/payload delivery system, in accordance with the aircraft embodiments described above. This Fig. shows a cut-away view of the mailbox  765  with payload  725  delivered therein. A cushioning member  770  is shown at an end of mailbox  765  to absorb the payload&#39;s  725  impact into mailbox  765 . The door  745  to mailbox  765  may be automatically closed upon delivery, with a lock  755  to secure the payload  725 . 
         [0040]    In some embodiments, aircraft  705  may have payload  725  attached in an inclined manner, to make it easier to orient the payload&#39;s pole grabber (not shown) to pole  785 , while aircraft  705  is at an angle-attack, attempting to align with pole  785 . 
         [0041]    With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity. 
         [0042]    It will be understood by those skilled in the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to embodiments containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. 
         [0043]    While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope being indicated by the following claims.