A hand-held blender

Abstract

This utility model discloses a handheld mixer, including a main housing, a driver disposed within the main housing, a stirring protective shell installed at the lower end of the main housing, a cutter shaft rotatably installed within the stirring protective shell, and a blade disposed at the lower end of the cutter shaft. The key feature is that a second connector is provided at the upper end of the cutter shaft, and a first connector is movably mounted at the lower end of the driver's output shaft. The first connector and the output shaft are coupled via a first movable shaft coupling structure so that rotation of the output shaft drives rotation of the first connector. The first connector and the second connector are coupled via a second movable shaft coupling structure so that rotation of the first connector drives rotation of the second connector. During operation, the female connector can automatically find its equilibrium position under centrifugal force, achieving dynamic self-centering, thereby greatly improving rotational balance and avoiding vibration and noise problems caused by insufficient coaxiality.

Description

Technical Field

[0001] This utility model relates to the field of mixer technology, and in particular to a handheld mixer. Background Technology

[0002] Handheld mixers, as a common kitchen appliance, are widely used in the processing of ingredients such as mixing, cutting, and blending, and are favored by users for their convenient operation and compact structure. However, traditional handheld mixers have certain defects in their structural design, especially in the power transmission section, which often uses rigid connections. For example, the female adapter and the motor output shaft are often assembled by pressure or interference fit. This structure places extremely high demands on the machining precision of the parts and the assembly process. Due to cumulative errors during machining and shrinkage deformation during injection molding, it is difficult to ensure the coaxiality between the female adapter and the motor shaft. In actual use, coaxiality deviation will lead to rotational imbalance, which in turn will cause severe vibration of the whole machine, affecting not only the operating feel but also generating more noise and reducing the user experience. In addition, long-term operation in a vibrating environment can also easily lead to accelerated wear of parts and shorten the product's lifespan. Therefore, there is an urgent need for a handheld mixer structure that can reduce the dependence on the precision of parts, improve operational stability, and reduce noise. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide a handheld mixer with low requirements for the manufacturing precision of the female adapter and low noise.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A handheld mixer includes a main housing, a driver disposed within the main housing, a stirring protective shell mounted on the lower end of the main housing, a cutter shaft rotatably mounted within the stirring protective shell, and a blade disposed on the lower end of the cutter shaft. The cutter shaft has a second connector at its upper end, and a first connector is movably mounted on the lower end of the output shaft of the driver. The first connector and the output shaft are coupled via a first movable shaft coupling structure so that rotation of the output shaft can drive rotation of the first connector. The first connector and the second connector are coupled via a second movable shaft coupling structure so that rotation of the first connector can drive rotation of the second connector.

[0006] In a preferred embodiment of this utility model, the first connector is a female connector and the second connector is a male connector.

[0007] In a preferred embodiment of the present invention, the first movable shaft coupling structure includes a square hole disposed on the female connector and a square plug disposed at the lower end of the output shaft, wherein the square plug is inserted into the square hole and a gap is left between the square plug and the inner wall of the square hole.

[0008] In a preferred embodiment of this utility model, a limiting screw is installed on the lower end face of the square plug, the female connector is movably sleeved outside the limiting screw, and the female connector is provided with a limiting surface that can abut against the head of the limiting screw to prevent the female connector from falling downward.

[0009] In a preferred embodiment of this utility model, the lower surface of the female connector is provided with a mating hole, the male connector is inserted into the mating hole and a gap is left between the male connector and the female connector, and the second movable shaft connection structure includes a spline provided on the male connector and a keyway corresponding to the spline, with a gap left between the keyway and the spline.

[0010] In a preferred embodiment of this utility model, the stirring protective shell includes a docking sleeve, a protective cover located below the docking sleeve, and a hollow tube connecting the protective cover and the docking sleeve. The lower end of the main housing has a connector that inserts into the docking sleeve. The main housing is provided with a limiting step that can abut against the upper edge of the protective cover. An inclined guide strip is provided on the outer side wall of the connector. A protrusion is provided on the inner side wall of the docking sleeve. When the docking sleeve rotates around the axis of the connector, the protrusion moves along the upper surface of the guide strip. A buckle is provided on the inner side wall of the docking sleeve. An elastic fastener is provided on the outer side wall of the connector that can engage with the buckle when the protrusion moves to the upper end of the guide strip.

[0011] In a preferred embodiment of the present invention, a U-shaped groove is provided on the outer side wall of the connector, and the portion surrounding the U-shaped groove forms an elastic arm distributed circumferentially along the connector. The elastic fastener includes the elastic arm and a fastening portion disposed at the free end of the elastic arm. The fastening position is a protrusion disposed on the inner side wall of the connecting sleeve.

[0012] In a preferred embodiment of this utility model, the elastic arm is located below the guide bar, the fixed end of the elastic arm is located on the side where the upper end of the guide bar is located, the free end of the elastic arm is located on the side where the lower end of the guide bar is located, and a guide slope is provided on the side of the fastening part opposite to the fixed end of the elastic arm.

[0013] The beneficial effects of this utility model are:

[0014] 1. Reduce manufacturing precision requirements and improve product yield: By setting a first movable shaft connection structure between the first connector and the output shaft of the driver, and a second movable shaft connection structure (such as a spline and keyway clearance fit) between the first and second connectors, the female connector becomes a movable intermediate transmission component. This structure allows for certain radial and angular deviations, reducing the stringent requirements on the machining precision and assembly coaxiality of parts, effectively reducing assembly difficulties caused by cumulative errors, and improving production efficiency and product yield.

[0015] 2. Significantly reduces vibration and noise, improving the user experience. During operation, the female connector can automatically find the balance position under the action of centrifugal force, achieving dynamic self-alignment, which greatly improves the rotational balance and avoids the vibration and noise problems of the whole machine caused by insufficient coaxiality, making the equipment run more smoothly and quietly, and improving the user's comfort.

[0016] 3. Reliable connection and convenient assembly / disassembly: The stirring protective shell and the main unit shell adopt a rotating snap-fit ​​connection structure. Through the cooperation of guide strips, protrusions, elastic fasteners, and latches, quick locking and unlocking are achieved. This structure not only ensures a firm connection and prevents accidental loosening during operation, but also allows users to easily disassemble, clean, or replace stirring accessories, enhancing the product's practicality and ease of maintenance.

[0017] 4. The structure is compact, the service life is long, the overall layout is reasonable, and the transmission parts and connecting parts are reserved with appropriate gaps, which not only ensures the effective transmission of power, but also avoids wear caused by hard contact, thus extending the service life of key components and improving the durability and reliability of the product. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 yes Figure 2 Enlarged view of section A;

[0021] Figure 4 This is an exploded view of the present invention;

[0022] Figure 5 yes Figure 4 Enlarged view of section B;

[0023] Figure 6 This is a cross-sectional view of the location of the elastic fastener. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings.

[0025] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicator will also change accordingly. Furthermore, descriptions involving "preferred," "second-preferred," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "preferred" or "second-preferred" may explicitly or implicitly include at least one of those features.

[0026] Reference Figures 1 to 6 This utility model proposes a handheld mixer, including a main housing 1, a driver 2 disposed within the main housing 1, a stirring protective shell 3 installed at the lower end of the main housing 1, a blade shaft 4 rotatably installed within the stirring protective shell 3, and blades 5 disposed at the lower end of the blade shaft 4. The upper end of the blade shaft 4 is provided with a second connector, and the lower end of the output shaft 21 of the driver 2 is movably mounted with a first connector. The first connector and the output shaft 21 are coupled through a first movable shaft coupling structure so that the rotation of the output shaft 21 can drive the first connector to rotate. The first connector and the second connector are coupled through a second movable shaft coupling structure so that the rotation of the first connector can drive the second connector to rotate.

[0027] In a preferred embodiment of this utility model, the aforementioned driver 2 is a motor, the first connector is a female connector 6, and the second connector is a male connector 7. The first movable shaft connection structure includes a square hole 61 disposed on the female connector 6 and a square plug 211 disposed at the lower end of the output shaft 21. The square plug 211 is inserted into the square hole 61, and a gap is left between the square plug 211 and the inner sidewall of the square hole 61. A limiting screw 8 is installed on the lower end face of the square plug 211. The female connector 6 is movably sleeved outside the limiting screw 8. The female connector 6 is provided with a limiting surface 601 that can abut against the head of the limiting screw 8 to prevent the female connector 6 from falling downward. A mating hole 62 is provided on the lower surface of the female connector 6. The male connector 7 is inserted into the mating hole 62, and a gap is left between the male connector 7 and the female connector 6. The second movable shaft connection structure includes a spline disposed on the male connector 7 and a keyway corresponding to the spline, with a gap left between the keyway and the spline.

[0028] In this design, the female connector 6 is designed as a movable part and can transmit power between the output shaft 21 and the blade shaft 4. During the operation of the mixer, the rotational force of the output shaft 21 will cause the female connector 6 to automatically return to center, so that the whole machine will not vibrate or make noise, thus achieving a silent effect.

[0029] In some embodiments of this utility model, the first movable shaft connection structure and the second movable shaft connection structure can also adopt other structural forms. For example, the specific structures of the first movable shaft connection structure and the second shaft connection structure can be interchanged; or, a hexagonal plug or a pentagonal plug can be used to replace the square plug 211 in the first movable shaft connection structure, and the female connector 6 can be correspondingly changed to a hexagonal hole or a pentagonal hole.

[0030] The first and second connectors can also adopt other structural forms, such as the first connector being a male connector and the second connector being a female connector.

[0031] Reference Figure 2 The stirring protective shell 3 includes a docking sleeve 31, a protective cover 32 located below the docking sleeve 31, and a hollow tube 33 connecting the protective cover 32 and the docking sleeve 31. The lower end of the cutter shaft 4 passes through the hollow tube 33 and extends into the protective cover 32, and the blade 5 is located inside the protective cover 32. The hollow tube 33 is provided with a bearing for supporting the cutter shaft 4.

[0032] The mixing components, consisting of the protective shell 3, the cutter shaft 4, and the blade 5, are generally designed to be detachable for easy replacement and cleaning.

[0033] In this invention, the installation structure of the main housing 1 and the stirring protective shell 3 is as follows: The lower end of the main housing 1 has a connector 11 that inserts into the connecting sleeve 31. The main housing 1 is provided with a limiting step 12 that can abut against the upper edge of the protective cover 32. An inclined guide strip 111 is provided on the outer side wall of the connector 11. A protrusion 311 is provided on the inner side wall of the connecting sleeve 31. When the connecting sleeve 31 rotates around the axis of the connector 11, the protrusion 311 moves along the upper surface of the guide strip 111. A fastening position 312 is provided on the inner side wall of the connecting sleeve 31, and an elastic fastener 115 is provided on the outer side wall of the connector 11. When the protrusion 311 moves along the upper surface of the guide strip 111 to the upper end of the guide strip 111, the connecting sleeve 31 abuts against or comes into close contact with the limiting step 12, and the elastic fastener 115 engages with the fastening position 312, thereby locking the main housing 1 and the stirring protective shell 3. When the protrusion 311 separates from the guide strip 111 and the elastic fastener 115 separates from the buckle 312, the main housing 1 and the stirring protective housing 3 are unlocked. At this time, the stirring protective housing 3, the blade shaft 4, and the blade 5 can be removed to form the stirring accessories.

[0034] Preferably, a U-shaped groove 114 is formed on the outer wall of the connector 11. The portion surrounding the U-shaped groove 114 forms an elastic arm 1151 distributed circumferentially along the connector 11. The elastic fastener 115 includes the elastic arm 1151 and a fastening part 1152 disposed at the free end of the elastic arm 1151. The fastening position 312 is a protrusion disposed on the inner wall of the mating sleeve 31. When the protrusion 311 moves to the upper end of the guide bar 111, the fastening part 1152 fastens to one side of the protrusion. The elastic arm 1151 is located below the guide bar 111. The fixed end of the elastic arm 1151 is located on the side where the upper end of the guide bar 111 is located, and the free end of the elastic arm 1151 is located on the side where the lower end of the guide bar 111 is located. A guide slope 108 is provided on the side of the fastening part 1152 opposite to the fixed end of the elastic arm 1151.

[0035] Reference Figure 5 and Figure 6 The advantage of this design is that, since the fastening part 1152 has a guide slope 108 on the side opposite to the fixed end of the elastic arm 1151, during the assembly of the stirring protective shell 3 and the main body shell 1, as the protrusion 311 moves along the upper surface of the guide strip 111 to the upper end of the guide strip 111, the aforementioned fastening position 312 can automatically press down the elastic fastener 115, so that the elastic fastener 115 is fastened with the fastening position 312. Since the free end of the elastic arm 1151 is located on the side where the lower end of the guide strip 111 is located, when it is necessary to assemble and separate the stirring protective shell 3 and the main body shell 1, the stirring protective shell 3 can be rotated in the opposite direction, and the fastening position 312 can be used to squeeze the elastic fastener 115 to make it retract inward, so that the fastening part 1152 of the fastening position 312 can be disengaged from the fastening part 1152 of the elastic fastener 115. After rotating for a certain distance, the protrusion 311 also separates from the guide strip 111, at which point the stirring protective shell 3 and the main body shell 1 can be detached.

[0036] The side of the fastening part 1152 opposite to the guide slope 108 is the fastening surface. If it is necessary to ensure a more secure assembly of the stirring protective shell 3 and the main body shell 1, the fastening surface can be set as a steeper slope, for example, with an inclination angle of 65-80 degrees. If it is necessary to ensure that the stirring protective shell 3 and the main body shell 1 are easy to disassemble when assembled, the fastening surface can be set as a gentler slope, for example, with an inclination angle of 45-60 degrees.

[0037] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A hand-held blender comprising a main housing (1), a drive (2) arranged in the main housing (1), a blending guard (3) mounted to the lower end of the main housing (1), a blade shaft (4) rotatably mounted in the blending guard (3), and a blade (5) arranged at the lower end of the blade shaft (4), characterized in that The upper end of the cutter shaft (4) is provided with a second connector, and the lower end of the output shaft (21) of the driver (2) is movably installed with a first connector. The first connector and the output shaft (21) are connected by a first movable shaft connection structure so that the output shaft (21) can drive the first connector to rotate when it rotates. The first connector and the second connector are connected by a second movable shaft connection structure so that the first connector can drive the second connector to rotate when it rotates.

2. A hand blender according to claim 1, characterized in that The first connector is a female connector (6), and the second connector is a male connector (7).

3. A hand blender according to claim 2, wherein, The first movable shaft connection structure includes a square hole (61) disposed on the female connector (6) and a square plug (211) disposed at the lower end of the output shaft (21). The square plug (211) is inserted into the square hole (61) and a gap is left between the square plug (211) and the inner wall of the square hole (61).

4. A hand blender according to claim 3, wherein, The lower end face of the square plug (211) is fitted with a limiting screw (8), and the female connector (6) is movably sleeved outside the limiting screw (8). The female connector (6) is provided with a limiting surface (601) that can abut against the head of the limiting screw (8) to limit the female connector (6) from falling downward.

5. A hand blender according to claim 2, wherein, The lower surface of the female connector (6) is provided with a mating hole (62), the male connector (7) is inserted into the mating hole (62) and a gap is left between the male connector (7) and the female connector (6), the second movable shaft connection structure includes a spline provided on the male connector (7) and a keyway corresponding to the spline, and a gap is left between the keyway and the spline.

6. A hand blender according to claim 1, characterized in that The stirring protective shell (3) includes a docking sleeve (31), a protective cover (32) located below the docking sleeve (31), and a hollow tube (33) connecting the protective cover (32) and the docking sleeve (31). The lower end of the main housing (1) has a connector (11) that inserts into the docking sleeve (31). The main housing (1) is provided with a limiting step (12) that can abut against the upper edge of the protective cover (32). An inclined guide strip is provided on the outer side wall of the connector (11). 111), a protrusion (311) is provided on the inner side wall of the mating sleeve (31). When the mating sleeve (31) rotates around the axis of the mating joint (11), the protrusion (311) moves along the upper surface of the guide bar (111). A buckle (312) is provided on the inner side wall of the mating sleeve (31). An elastic fastener (115) is provided on the outer side wall of the mating joint (11) and can engage with the buckle (312) when the protrusion (311) moves to the upper end of the guide bar (111).

7. A hand blender according to claim 6, wherein, A U-shaped groove (114) is provided on the outer side wall of the connector (11). The portion of the U-shaped groove (114) surrounding the connector (111) forms an elastic arm (1151) distributed circumferentially along the connector (11). The elastic fastener (115) includes the elastic arm (1151) and a fastening part (1152) provided at the free end of the elastic arm (1151). The fastening position (312) is a protrusion provided on the inner side wall of the mating sleeve (31).

8. A hand blender according to claim 7, characterized in that The elastic arm (1151) is located below the guide bar (111). The fixed end of the elastic arm (1151) is located on the side where the upper end of the guide bar (111) is located, and the free end of the elastic arm (1151) is located on the side where the lower end of the guide bar (111) is located. A guide slope (108) is provided on the side of the fastening part (1152) opposite to the fixed end of the elastic arm (1151).

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