Lever pressurization extraction device

Abstract

The invention discloses a lever pressurization extraction device, and belongs to the technical field of coffee brewing appliances. The device comprises a base, a brewing head assembly, a piston and a lever pressurizing mechanism. The lever pressurizing mechanism is connected with the outer side of the brewing head assembly through a hinge and comprises a pressing rod, a connecting rod and a round piece. One end of the connecting rod is hinged with the hinge; one end of the pressing rod is connected with the wafer. The pressing rod is pressed down to amplify acting force according to the lever principle, the piston is driven by the connecting rod and the wafer to stably move downwards in the water sump, and stable pressure is applied to hot water to achieve extraction. The lever is combined with the rigid base, the effects of remarkable labor saving and stable and controllable pressure are achieved, meanwhile, the structure is compact, and cleaning and adjusting are convenient.

Description

Technical Field

[0001] This invention relates to the manufacture of a pressure extraction device, and more particularly to a portable coffee extraction device that provides extraction pressure via a manual lever. Background Technology

[0002] Manual coffee extraction devices are increasingly favored by the market due to their portability and interactive experience. Existing manual pressurization devices are mainly divided into two categories, but both have inherent drawbacks that are difficult to overcome.

[0003] The first type is the "direct pressure" device represented by the AeroPress. Its working principle involves the user directly gripping and pressing the piston with both hands, causing the piston to act directly on the water and pressurize the coffee puck for extraction. This method has significant drawbacks: it is laborious and the pressure is unstable. The extraction pressure depends entirely on the user's arm strength and physical strength. When higher pressure is needed (such as to mimic espresso) or when applying pressure evenly for a long time, it is extremely strenuous, and the pressure curve decreases as the user's physical strength declines, resulting in uneven extraction and difficulty in consistently replicating the quality.

[0004] Poor pressure control can easily lead to channeling effects: The user's instantaneous application of force can easily create pressure peaks, and uneven force application will cause water to preferentially pass through the weakest points of the coffee puck (i.e., channeling effect), resulting in some coffee powder being over-extracted while others are under-extracted, which seriously affects the flavor.

[0005] Stroke and capacity are limited: The piston stroke and the user's pressing stroke are in a 1:1 ratio. Within the limited device height, the effective capacity of the water tank and the effective pressurization stroke of the piston are mutually constrained, resulting in poor design flexibility.

[0006] The second type is the "handheld lever-type" device, which emerged to save effort. While this type of device incorporates the lever concept, its design typically integrates the entire lever mechanism with the brewing head into a single unit. The user must hold the main body of the device with one hand and press down on the lever with the other. Although this method reduces the pressure required to some extent, it introduces new problems: 1) High heat absorption: During use, because the entire lever mechanism is integrated with the brewing head into one unit, preheating or the addition of a heating device is necessary, making the structure more complex. Without preheating, the extraction effect is difficult to guarantee. 2) Inconvenient cleaning due to structural integration: The complex lever and transmission mechanism, highly integrated with the water tank and brewing head, make disassembly, cleaning, and maintenance of the device extremely difficult, affecting user experience and hygiene safety. 3) Lack of rigid support and low pressure limit: Due to the lack of a stable base to counteract the huge reaction force generated by the lever, the actual safe and effective pressure limit is severely limited, making it impossible to achieve truly stable medium-to-high pressure extraction. 4) The water tank / boiler is made of stainless steel or similar materials, which are prone to heat loss or require preheating.

[0007] Therefore, there is a need in this field for an innovative solution that can greatly reduce labor, provide stable and controllable extraction pressure, eliminate the need for preheating, and be stable and easy to clean, in order to overcome the technical bottlenecks of existing manual pressurization devices. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a lever-pressure extraction device that is easy to operate, has stable pressure, and has an ingenious structure.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a lever-pressurized extraction device, comprising a base, a brewing head assembly, a piston, and a lever-pressurized mechanism. The brewing head assembly forms a water tank inside, with a water outlet at the bottom, and is preferably connected to a coffee portafilter via a quick-connect structure. The lever-pressurized mechanism is connected to the outside of the integrated support and quick-connect structure of the brewing head assembly via a hinge structure (preferably a triple hinge), and includes a pressure lever and a transmission assembly. When the user presses down the pressure lever, a lever-based effect is achieved, and this amplified force is transmitted through the transmission assembly, ultimately driving the piston to move smoothly downward within the water tank, applying stable and uniform pressure to the hot water, causing it to penetrate the coffee puck and complete the extraction.

[0010] Preferably, the lever pressing mechanism includes a connecting rod as a lever arm, a pressure rod as a force-applying arm, and a disc as an actuating element. One end of the connecting rod is hinged to the central connection point of the triple hinge, and the other end is fixedly connected to the disc; one end of the pressure rod is fixedly connected to the disc, and the other end is a free force-applying end. Thus, pressing down the pressure rod can drive the disc and piston to move linearly downward through the connecting rod.

[0011] Preferably, the connecting rod and the pressure rod are connected by an adjustable length (e.g., by a threaded connection). By adjusting this length, the initial height of the disc can be changed, thereby adapting to different initial water volumes in the water tank.

[0012] Preferably, a threaded hole is made on the upper side of the piston to install a pressure gauge.

[0013] Preferably, the main body of the pressure extraction device is connected to the base via an upper support screw, a lower support screw, bolts, and gaskets.

[0014] The beneficial effects of this invention are as follows: Significantly labor-saving: Utilizing the lever principle, users only need to press down the lever with a small force to generate a large downward pressure at the piston end, easily achieving medium-to-high pressure extraction. Stable and controllable pressure: The lever's movement speed is easy to control, making the piston's descent smoother and the pressure applied to the water more evenly and stably, which is beneficial for improving extraction quality. Stroke amplification effect: The longer stroke on one side of the lever fulcrum is converted into a shorter, precise stroke at the piston end through the transmission mechanism, achieving force amplification and precise stroke control. Adjustable initial capacity: By adjusting the upper and lower support screws, the initial volume of the water tank can be changed, making it versatile and suitable for brewing different amounts of coffee. Compact and stable structure: The overall mechanism has a high degree of integration, and the base provides stable support, making it both portable and stable in use. Preheating is not required. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the device of the present invention.

[0016] Figure 2 This is an assembly diagram of the integrated support and quick-connect structure and the insulated water tank of the present invention.

[0017] Figure 3 This is a fixed schematic diagram of the present invention.

[0018] Figure 1 In the middle: 1. Pressure rod; 2. Circular plate; 3. Triple hinge; 4. Piston; 5. Brewing head assembly; 6. Upper support screw; 7. Lower support screw; 8. Base; 9. Connecting rod.

[0019] Figure 2 In the middle: 1. Insulated water tank; 2. Integrated structure of support and quick connection. Detailed Implementation

[0020] The present invention will now be further described with reference to the accompanying drawings.

[0021] Reference Figures 1 to 3 The present invention provides a lever-pressurized extraction device, which mainly consists of a base 8, a brewing head assembly 5, a piston 4, and a lever-pressurized mechanism.

[0022] The brewing head assembly 5 includes an insulated water tank 1 and an integrated support and quick-connect structure 2 (see...). Figure 2 The upper part of the quick-connect interface of the integrated support and quick-connect structure 2 has an inverted T-shaped structure, and the bottom of the insulated water tank 1 has a matching T-shaped groove, allowing the insulated water tank 1 to be inserted and fixed from bottom to top. This structure achieves both sealing and easy disassembly and cleaning. The bottom of the integrated support and quick-connect structure 2 has a quick-connect interface for quickly installing and removing the coffee portafilter containing coffee grounds.

[0023] Lever-applying mechanism: This mechanism is the core of this design. It includes a pressure rod 1, a connecting rod 9, a triple hinge 3, and a disc 2. The connecting rod 9 serves as the core lever arm, with one end hinged to the central connection point of the triple hinge 3 and the other end fixedly connected to the disc 2. The pressure rod 1 serves as the applying lever arm, with one end fixedly connected to the disc 2 and the other end free for the user to press down. The connection points on both sides of the triple hinge 3 are connected to the brewing head assembly 5 via upper support screws 6. This structure forms a lever system with the central point of the triple hinge as the fulcrum, converting the downward pressure into a linear drive to the piston 4 via the disc 2.

[0024] Base Connection: The lever pressurizing mechanism is fixedly connected to the base 8 via the integrated support and quick-connect structure 2, upper screw 6, lower screw 7, bolts, and washers. Specifically, the lower end of the upper screw 6 is inserted into the through countersunk hole on the outside of the integrated support and quick-connect structure 2, the upper end of the lower screw 7 is threaded to the lower end of the upper screw 6, and its lower end is locked to the base 8 by screws, washers, and other fasteners.

[0025] Working process: In use, first place piston 4 into the insulated water tank 1 and inject hot water into the tank. Then press down the free end of pressure rod 1. The force amplified by the lever principle is transmitted through connecting rod 9 and disc 2, driving piston 4 to move smoothly downward in the water tank, applying stable and uniform pressure to the hot water to complete the extraction. (If feasible) By rotating the connection structure between connecting rod 9 and pressure rod 1, the length of the entire lever arm can be changed, thereby changing the initial height of disc 2 and adapting to different initial water volumes in the water tank.

[0026] In addition, a threaded hole is provided on the upper side of piston 4, which can be used to install a pressure gauge to monitor the extraction pressure in real time.

Claims

1. A lever-operated pressure extraction device, characterized in that, include: Base; The brewing head assembly is fixed on the base, and has an insulated water tank inside and a water outlet at the bottom; The piston is slidably disposed within the water tank; A lever pressurizing mechanism is connected to the outside of the brewing head assembly via a hinge structure; the lever pressurizing mechanism includes a pressure rod and a transmission assembly; one end of the transmission assembly is connected to the force-applying part of the pressure rod, and the other end can drive the piston; wherein, pressing down the pressure rod can drive the piston to move downward in the water tank through the transmission assembly to apply pressure to the water in the water tank.

2. The apparatus according to claim 1, characterized in that, The brewing head assembly includes an insulated water tank and an integrated support and quick-connect structure; the integrated support and quick-connect structure forms the outer shell of the brewing head assembly and provides an installation fulcrum for the hinge structure, and its bottom is provided with a quick-connect structure for connecting the coffee handle.

3. The apparatus according to claim 2, characterized in that, The quick-connect interface of the integrated support and quick-connect structure is provided with a first connecting structure at the top, and the bottom of the insulated water tank is provided with a corresponding second connecting structure. The insulated water tank is installed in the integrated support and quick-connect structure from bottom to top through the cooperation of the first connecting structure and the second connecting structure.

4. The apparatus according to claim 3, characterized in that, One of the first connecting structure and the second connecting structure has an inverted T-shaped cross-section, and the other has a T-shaped groove adapted to the inverted T-shaped structure.

5. The apparatus according to claim 1, characterized in that, The transmission assembly includes: a connecting rod, one end of which is connected to the hinge structure; and a disc, fixed to the other end of the connecting rod, for driving the piston.

6. The apparatus according to claim 1, characterized in that, One end of the pressure rod is connected to the disc, and the other end is the force-applying end.

7. The apparatus according to claims 5 and 6, characterized in that, The pressure rod and the connecting rod are connected by an adjustable length.

8. The apparatus according to claim 7, characterized in that, The pressure rod and the connecting rod are connected by a thread to achieve an adjustable length; by rotating one of them, the initial height of the disc can be changed.

9. The apparatus according to claim 1 or 2, characterized in that, The brewing head assembly is detachably and fixedly connected to the base via a connector.

10. The apparatus according to claim 1, characterized in that, The piston has an installation interface on its upper side for installing a pressure monitoring device.

11. The apparatus according to claim 1, characterized in that, The hinge structure is a triple hinge, which has three connection points, respectively connected to the connecting rod and two connecting parts that fix the entire lever pressurization mechanism to both sides of the brewing head assembly.

12. The apparatus according to claim 11, characterized in that, The two connecting parts are an upper support screw and a lower support screw; the upper end of the upper support screw is threadedly connected to the connection point of the triple hinge, and the lower end is inserted into the mounting hole on the outside of the brewing head assembly; the upper end of the lower support screw is threadedly connected to the lower end of the upper support screw, and the lower end is fixedly connected to the base by a fastener.

13. The apparatus according to claims 5 and 6, characterized in that, Two of the components—the connecting rod, the disc, and the pressure rod—are manufactured as a single unit.

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