Coffee apparatus with vacuum-fresh coffee beans
View Patent ↗A coffee apparatus comprises a coffee grinder which receives the coffee beans from a chamber which has a hermetically-sealed lid and a manually-operable venting valve, a sealing assembly for the outlet of the chamber, a vacuum pump capable of evacuating the chamber and a pressure switch connected to the vacuum pump and the chamber by a T-connector for turning on the pump to maintain a vacuum in the chamber when pressure in the chamber rises.
1. A coffee apparatus comprising:
a housing formed with a chamber for storing coffee beans and a compartment for receiving ground coffee;
a grinder in said housing having an inlet communicating with said chamber for receiving coffee beans therefrom and an outlet for discharging ground coffee into said compartment;
a suction pump having an intake connected to said chamber for evacuating said chamber and maintaining said beans fresh under vacuum; and
a pressure switch assembly responsive to the pressure in said chamber and connected to said suction pump for automatically activating said suction pump upon an increase in pressure in said chamber.
2. The coffee apparatus defined in claim 1 wherein said chamber is provided with a lid and a seal between said lid and said chamber for hermetically-sealing said lid to said chamber upon application of suction to said chamber.
3. The coffee apparatus defined in claim 2 , further comprising a manual valve in said lid actuatable to vent said chamber.
4. The coffee apparatus defined in claim 1 wherein said chamber has an outlet, said apparatus further comprising a sealing assembly for said outlet.
5. The coffee apparatus defined in claim 4 wherein said outlet is aligned on said grinder and adapted to deliver coffee beans thereto.
6. The coffee apparatus defined in claim 5 wherein said assembly comprises a fixed plate extending from said outlet, a slider guided on said fixed plate and sealingly engageable with said outlet, and an electromagnetic actuator connected with said slider for shifting same from a sealed position in which said slider is sealed against said outlet to a position in which said outlet is free to deliver coffee beans to said grinder.
7. The coffee apparatus defined in claim 6 , further comprising a resetting spring for returning said slider to said sealed position.
8. The coffee apparatus defined in claim 7 , further comprising a rubber sealing ring surrounding said outlet, said slider bearing on said ring.
9. The coffee apparatus defined in claim 5 wherein said sealing assembly comprises a rubber ring surrounding said outlet, a rotary member displaceable from a position in which said member sealingly engages said ring into a position in which coffee beans are free to pass through said outlet into said grinder, and an electromagnetic actuator for rotating said plate between said position.
10. The coffee apparatus defined in claim 9 , further comprising a resetting spring acting upon said plate for urging said plate into a position in which said plate seals against said ring.
11. The coffee apparatus defined in claim 1 wherein said pressure switch assembly is provided with a piston displaceable against a spring and connected with a microswitch for automatically switching said microswitch between an “on” position and an “off” position, upon a reduction of pressure in said pressure switch assembly to a level sufficient to maintain coffee beans in said chamber fresh.
12. The coffee apparatus defined in claim 1 , further comprising a T-connector having one passage connected to a suction pump, a second passage connected to said pressure switch assembly and a third passage connected to said chamber.
13. The coffee apparatus defined in claim 12 , further comprising a rubber tube connecting said third passage to said chamber and opening at a filter into said chamber.
14. The coffee apparatus defined in claim 13 wherein said chamber is provided with a lid and a seal between said lid and said chamber for hermetically-sealing said lid to said chamber upon application of suction to said chamber.
15. The coffee apparatus defined in claim 14 wherein said chamber is provided with an outlet formed with a rubber ring and aligned with said inlet, and a sealing assembly between said outlet and said inlet and including a member displaceable from a sealing position in which said member engages said ring into a position in which said member enables coffee beans to pass from said outlet into said inlet and an electromagnetic actuator for said member shifting said member between said positions.
16. The coffee apparatus defined in claim 15 , further comprising a spring urging said member into said sealing position.
17. The coffee apparatus defined in claim 16 wherein said pressure switch assembly is provided with a piston displaceable against a spring and connected with a microswitch for automatically switching said microswitch between an “on” position and an “off” position, upon a reduction of pressure in said pressure switch assembly to a level sufficient to maintain coffee beans in said chamber fresh.
18. The coffee apparatus defined in claim 17 wherein said apparatus is a coffee maker.