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A coffee brewer including a feed head for supplying pressurized brewing water to a perforated platen pressed against a packet of coffee bean grind to force such fluid in a substantially uniform flow pattern through the packet toward an outlet from a supporting tray.

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1. A beverage brewer for brewing a beverage from a grind in a porous wall packet of a predetermined shape and comprising:a brew device including a beverage container table for receiving a beverage container and an overhead mounting a feed head spaced there above for emitting brewing liquid; a tray h

1. A beverage brewer for brewing a beverage from a grind in a porous wall packet of a predetermined shape and comprising:a brew device including a beverage container table for receiving a beverage container and an overhead mounting a feed head spaced there above for emitting brewing liquid; a tray holder mounted below the feed head; an upwardly opening tray carried from the holder and including a perforated distribution plate and upstanding side walls defining a compartment configured to receive the packet with one side facing upwardly; a platen carried from the overhead, sized to be received in such compartment, formed with a pattern of dispersing openings arrayed there across for flow of liquid from such feed head to be dispersed over such one side of such packet; and a spring biasing the platen downwardly. 2. The beverage brewer of claim 1 wherein:the platen is biased downwardly against the packet with sufficient force to compress the grind tending to force it laterally outwardly; and the tray is configured with the side walls cooperating to complimentary receive the packet in close fit relationship to support the sides of the packet as the platen is biased downwardly to force the charge laterally outwardly. 3. The beverage brewer of claim 1 wherein:the holder includes a horizontal track; the tray is in the form on an open top box received slidably on the track and operable to be slid from a brew position under the feed head to a loading position clear of such feed head. 4. The beverage brewer of claim 1 for use with a packet having, when received in the tray a horizontal periphery of a selected configuration and wherein:the platen is formed with the openings arrayed in a pattern complimenting the selected configuration. 5. The beverage brewer of claim 1 for use with a packet formed with a rectangular selected configuration and wherein:the platen is formed with the openings arrayed a rectangular pattern. 6. The beverage brewer of claim 1 wherein:the platen is formed on its underside with respective seals surrounding the respective openings for engaging and sealing against the one side of the packet. 7. The beverage brewer of claim 1 that includes:a vertical tube mounted from such overhead for vertical reciprocation with respect thereto and mounting the platen at the bottom extremity thereof. 8. The beverage brewer of claim 1 wherein:the spring is a coil spring disposed coaxially about the tube to bias the platen downwardly. 9. The beverage brewer of claim 7 that includes:a flexible fluid conduit connected on one end with the tube and wherein; the tube is connected with the feed head. 10. The beverage brewer of claim 1 wherein:the spring is operative to bias the platen downwardly with a substantially one pound of force. 11. The beverage brewer of claim 1 that includes:a catch device for locking the platen in an elevated position relative to the tray. 12. The beverage brewer of claim 1 that includes:a feed tube for feeding hot water; a bonnet connecting the outlet of the tube with the platen. 13. The beverage brewer of claim 12 wherein:the bonnet covers the dispersing openings and cooperates with such platen to form a plenum chamber for containing water to be dispersed out the openings. 14. The beverage brewer of claim 1 wherein:the platen is formed with such openings arrayed thereabout in a pattern complimenting the shape of such compartment. 15. The beverage brewer of claim 12 that includes:a vertical tube movably mounted from the overhang for vertical travel relative thereto; the platen being mounted to the lower extremity of such tube for vertical upward shifting as the grind swells. 16. The beverage brewer of claim 13 that includes:a stem projecting upwardly from the tube and including a hand grasp to be grasped for raising of the platen off the packet. 17. The beverage brewer of claim 13 wherein:the spring is a compression coil spring biasing the platen downwardly toward the tray. 18. A brewer as set forth in claim 1 wherein:the distribution plate includes distribution holes in the platen and in the bottom wall of the tray. 19. The beverage brewer of claim 1 wherein:the spring is a single spring located centrally over the platen. 20. The beverage brewer of claim 1 that includes:a heat exchange tube connected with the feed head; and a heater disposed in heat relationship with such tube. 21. The beverage brewer of claim 20 that includes:a feed line connected with such tube; and a meter for metering the flow of brewing fluid through such heating tube. 22. A coffee brewer comprising:a tower including a container table and an overhang spaced there above; a coffee packet including a porous envelope containing a sufficiently large charge of coffee grind to fill such envelope to a selected depth, such grind being responsive to moisture to swell and increase such selected depth; a feed head mounted on the tower for applying water to such packet; a tray interposed between the feed head and configured with a compartment sized to support the lateral sides of such envelope against lateral outward expansion, the tray further including a perforated bottom wall; a platen resting on the packet and formed with disbursement opening for receipt and flow of water from the feed head to disperse water down through the interstices formed between such grind and through the perforations in such bottom wall; and a spring biasing the platen downwardly against such packet to maintain such platen pressed against such packet as water is flowed from feed head through the openings into the charge of coffee grind. 23. A beverage brewer for brewing a beverage from a grind in a porous wall packet and comprising:a brew device including a tray holder; an upwardly opening tray carried from the holder and including a perforated distribution plate and upstanding side walls defining a compartment configured to receive the packet; a platen disposed over the tray, sized to be received downwardly in the compartment, shiftable between a retracted position disposed above the compartment and a working position received in such compartment to engage the packet in such compartment, the platen including dispersing openings for flow of liquid; a feed head located above such tray and arrange to spray liquid into such compartment; and a spring for biasing the platen downwardly against The packet in such compartment. 24. A beverage brewer for brewing a beverage from a grind in a porous wall packet and comprising:a brewer housing; a liquid distribution head for distributing liquid downwardly through a flow path; a container in the flow path for receiving liquid from the distribution head; a tray interposed in the flow path above the container and having in an upwardly opening compartment for receipt of the packet to be positioned in such flow path to receive flow from the head, the tray including a perforated bottom wall; a platen carded from such brewer housing over the tray and configured to be moved between an elevated position and a lowered position pressing on the packet disposed in such container that platen being biased downwardly to the lowered position; and a retractor acting independent of fluid flow for retracting such platen from its lowered position to its elevated position whereby the retractor may be activated to retract the tray, the packet placed in the tray and the refractor activated to release the platen to be lowered independent of fluid flow through the distribution head to be pressed against the packet and thereafter fluid flowed through the distribution head. 25. A beverage brewer for brewing a beverage from a grind in a porous wall packet of a predetermined shape and comprising:a brew device including a beverage container table for receiving a beverage container and an overhead mounting a feed head spaced there above for emitting brewing liquid; an tray holder mounted below the feed head; an upwardly opening tray carried from the holder and including a perforated distribution plate and upstanding side walls defining a compartment configured to receive the packet with one side facing upwardly; a platen carried from the overhead, sized to be received in such compartment, formed with a pattern of dispersing openings arrayed there across for flow of liquid from such feed head to be dispersed over such one side of such packet, such platen further being biased downwardly; and a catch device for locking the platen in an elevated position relative to the tray. 26. A coffee brewer for brewing coffee grind contained in a packet with a porous envelope and comprising;a brew tower including a container table with an overhang disposed thereover; feed head means on the overhang; tray means interspersed between the feed head means and the table and including constraining means for constraining the packet from expanding horizontally; platen means; spring means for mechanically biasing the platen downwardly; and flow distribution means in the platen means and tray means for directing flow from such feed head to be distributed substantially evenly through the grind in the packet toward the table. 27. A method of brewing a beverage from a grind in a porous wall packet including:selecting a brewing device including a holding device for holding a porous wall packet of grind and having a perforated bottom wall; selecting a perforated platen and a spring; employing the spring to press the perforated platen downwardly on such packet; flowing fluid through the perforated platen, packet and out the perforations in the bottom wall to distribute flow essentially evenly through the packet while the packet is compressed between the platen and bottom wall; and raising the platen against the bias of the spring to release the packet. 28. The method of claim 27 that includes:flowing fluid around the periphery of the platen. 29. A one cup beverage brewer for brewing a beverage from a grind in a porous wall packet of a predetermined shape containing a quantity of such grind sufficient to brew a one cup beverage and comprising:a brew device including a beverage container table for receiving a coffee cup and an overhead mounting a feed head spaced there above for emitting brewing liquid; a tray holder mounted below the feed head; an upwardly opening tray carried from the holder and including a perforated distribution plate and upstanding side walls defining a compartment configured to receive the packet with one side facing upwardly; a platen carded from the overhead, sized to be received in such compartment, formed with a pattern of dispersing openings arrayed there across for flow of liquid from such feed head to be dispersed over such one side of such packet, such platen further being biased downwardly; and a catch device a for locking the platen in an elevated position relative to the tray. 30. The one cup beverage brewer of claim 29 wherein:the platen is biased downwardly against the packet with sufficient force to compress the grind tending to force it laterally outwardly; and the tray is configured with the side walls cooperating to complementary receive the packet in close fit relationship to support the sides of the packet as the platen is biased downwardly to force the charge laterally outwardly. 31. The one cup beverage brewer of claim 29 wherein:the holder includes a horizontal track; and the tray is in the form on an open top box received slidably on the track and operable to be slid from a brew position under the feed head to a loading position clear of such feed head. 32. The one cup beverage brewer of claim 29 for use with a packet having, when received in the tray, a horizontal periphery of a selected configuration and wherein:the platen is formed with the openings arrayed in a pattern complimenting the selected configuration. 33. The one cup beverage brewer of claim 32 for use with a packet formed with a rectangular selected configuration and wherein:the platen is formed with the openings arrayed a rectangular pattern. 34. The one cup beverage brewer of claim 29 wherein:the platen is formed on its underside with respective seals surrounding the respective openings for engaging and sealing against the one side of the packet. 35. The one cup beverage brewer of claim 29 that includes:a vertical tube mounted from such overhead for vertical reciprocation with respect thereto and mounting the platen at the bottom extremity thereof. 36. The one cup beverage brewer of claim 35 that includes:a coil spring disposed coaxially about the tube to bias the platen downwardly. 37. The one cup beverage brewer of claim 35 that includes:a flexible fluid conduit connected on one end with the tube and wherein the tube is connected with the feed head. 38. The one cup beverage brewer of claim 29 wherein:the platen is biased downwardly with a substantially one pound of force. 39. The one cup beverage brewer of claim 29 that includes:a feed tube for feeding hot water; and a bonnet connecting the outlet of the tube with the platen. 40. The one cup beverage brewer of claim 39 wherein:the bonnet covers the dispersing openings and cooperates with such platen to form a plenum chamber for containing water to be dispersed out the openings. 41. The one cup beverage brewer of claim 39 wherein:the platen is formed with such openings arrayed thereabout in a pattern complimenting the shape of such compartment. 42. The one cup beverage brewer of claim 39 that includes:a vertical tube movably mounted from the overhang for vertical travel relative thereto; and the platen being mounted to the lower extremity of such tube for vertical upward shifting as the grind swells. 43. The one cup beverage brewer of claim 40 that includes:a stem projecting upwardly from the tube and including a hand grasp to be grasped for raising of the platen off the packet. 44. The one cup beverage brewer of claim 40 that includes:bias means biasing the platen means downwardly toward the tray means. 45. The beverage brewer of claim 29 that includes;a heat exchange tube connected with the feed head; and a heater disposed in heat relationship with such tube. 46. The beverage brewer of claim 45 that includes a feed line connected with such tube; anda meter for metering the flow of brewing fluid through such heating tube. 47. A one cup beverage brewer for brewing a beverage from a grind in a porous wall packet of a predetermined shape containing a quality of such grind to brew a one cup beverage and comprising:a brew device including a beverage container table for receiving a coffee cup and an overhead mounting a feed head spaced there above for emitting brewing liquid; a tray holder mounted below the feed head; an upwardly opening tray carried from the holder and including a perforated distribution plate and upstanding side walls defining a compartment configured to receive the packet with one side facing upwardly; and a platen carried from the overhead, sized to be received in such compartment, and to cooperate with the upstanding side walls to define a clearance space between the peripheral edges of the platen and side walls, formed with a pattern of dispersing openings arrayed there across for flow of liquid from such feed head to be dispersed over such one side of such packet, such platen further being biased downwardly. 48. The one cup beverage brewer of claim 47 that includes:a spring biasing such platen downwardly. 49. A one cup coffee brewer comprising:a tower including a container table and an overhang spaced there above; a coffee packet formed by a porous envelope containing a sufficiently large charge of coffee grind to fill such envelope to a selected depth, and to brew one cup of coffee such grind being responsive to moisture to swell and increase such selected depth; a feed head mounted on the tower for applying water to such packet; a tray interposed between the feed head and configured with a compartment sized to support the lateral sides of such envelope against lateral outward expansion, the tray further including a perforated bottom wall; a platen resting on the packet and formed with disbursement openings for receipt and flow of water from the feed head to disperse water down through the interstices formed between such grind and through the perforations in such bottom wall; and a spring biasing the platen downwardly against such packet to maintain such platen pressed against such packet as water is flowed from feed head through the openings into the charge of coffee grind. 50. A one cup coffee brewer comprising:a tower including a container table for receiving a coffee cup and an overhang disposed thereover; a feed head mounted on the overhang; a tray interposed between the feed head and table for receipt of a packet of coffee grind; a platen for floatable receipt on the packet when received in the tray; and flow distribution means including distribution holes in the platen and in the bottom wall of the tray for receiving fluid flow from the feed head to direct it in controlled flow distribution through the packet toward the table. 51. The one cup beverage brewer of claim 50 that includes:the distribution means includes bias means biasing the platen toward the bottom wall of the tray. 52. A one cup beverage brewer for brewing a beverage from a predetermined charge of grind of quantity sufficient to brew a one cup beverage and comprising:a brew device including a beverage container table for receiving a beverage container and an overhead mounting a feed head spaced there above for emitting brewing liquid; a tray holder mounted below the feed head; an upwardly opening tray carried from the holder and including a perforated distribution plate and upstanding side walls defining a compartment configured to receive the charge of grind; a platen carried from the overhead, sized to be received in such compartment, formed with a pattern of dispersing openings arrayed there across for flow of liquid from such feed head to be dispersed over such grind; and a spring biasing the platen downwardly. 53. A one cup beverage brewer for brewing a beverage from a predetermined charge of grind sufficient to brew a one cup beverage and comprising:a brew device including a beverage container table for receiving a beverage container and an overhead mounting a feed head spaced there above for emitting brewing liquid; a tray holder mounted below the feed head; an upwardly opening tray carried from the holder and including a perforated distribution plate and upstanding side walls defining a compartment configured to receive the charge of grind; a platen carried from the overhead, sized to be received in such compartment, formed with a pattern of dispersing openings arrayed there across for flow of liquid from such feed head; and a catch device for locking the platen in an elevated position relative to the tray. 54. A one cup coffee brewer comprising:a tower including a container table and an overhang disposed thereover; a feed head mounted on the overhang; a holder for receiving a charge of coffee grind; a platen for floatable receipt on the coffee grind in the compartment: a spring biasing the platen downwardly; and flow distribution means in the platen and tray for receiving fluid flow from the feed head to direct it in controlled flow distribution through the packet toward the table. 55. A one cup beverage brewer for brewing a beverage grind in a porous wall packet and comprising:a brew device housing including a container mounting table with a feed head disposed thereover for flowing brewing fluid toward the container; a coffee packet holding device including a perforated distribution plate for flow of fluid and upstanding side walls defining a compartment for receipt of the packet; a platen carried from the brewing device housings over the holder device and formed with a peripheral configuration complimenting the configuration of the side walls and cooperating therewith to form a perimetric clearance space, the platen including a pattern dispersing openings arrayed there across for flow of fluid from the feed head to be dispersed over through the packet toward the perforations in the distribution plate; and such platen being biased downwardly toward the distribution plate.