CA2113691C - Wand-type hand mixer having a removable operating head - Google Patents
Wand-type hand mixer having a removable operating head Download PDFInfo
- Publication number
- CA2113691C CA2113691C CA002113691A CA2113691A CA2113691C CA 2113691 C CA2113691 C CA 2113691C CA 002113691 A CA002113691 A CA 002113691A CA 2113691 A CA2113691 A CA 2113691A CA 2113691 C CA2113691 C CA 2113691C
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- CA
- Canada
- Prior art keywords
- shaft
- end portion
- hand mixer
- groove
- shaped
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
- A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
- A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
- A47J43/07—Parts or details, e.g. mixing tools, whipping tools
- A47J43/0705—Parts or details, e.g. mixing tools, whipping tools for machines with tools driven from the upper side
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/16—Joints and connections with adjunctive protector, broken parts retainer, repair, assembly or disassembly feature
- Y10T403/1616—Position or guide means
Abstract
A shaft (6) extending from a motor housing (1) of the mixer terminates in an end portion (10) which, for easy attachment of an operating head (H) thereto, is formed with a shallow circumferential groove (18). This permits fitting a hub or sleeve (13) on the operating head (H) onto the end portion (10) of the shaft with axial misalignment, without exerting lateral bending forces on the hub (13). The head is formed with a resiliently deflectable tab or flap (15) for frictional engagement with the shaft, to hold the head in secure axial position on the shaft. The terminal end (19) of the shaft (6) is convex, essentially ball-shaped or part-spherical. Preferably, a guide ring or guide surface (23), having the diameter of the shaft, is positioned between the circumferential or ring-shaped groove (18) and the ball-shaped or spherical end (19). The .groove (18) is shallow, wider than deep, and preferably, in cross section, part-circular. The circle has a radius of curvature of preferably between about 75% to 150% of the diameter of the shaft (6) on which the operating head is fitted.
Description
21~~~~~.
93 0F3 o8-shf PA i uaA sg "WAND-TYPE HAND MIXER HAVING A REMOVABLE
OPERATING HEAD"
FIELD OF THE INVENTION.
The present invention relates to a kitchen appliance, and more particularly to a hand mixer of the wand type, that. is, a hand mixer,having a motor in a housing adapted to be gripped by the user. A shaft extends from the housing, in line or coaxial with the shaft of the motor. A mixing head having a tubular coupling extension can be attached to the motor shaft, for immersion in materials to be treated upon rapid rotation of the mixing head.
10' BACKGROUND.
Mixers of this type are used for folding, stirring, mixing, combining, blending, whipping, emulsifying, homogenizing and beating of substances retained in a bowl. Mixers of this kind;
if they have one shaft, are also referred to as wand-type mixers:
others have two parallel shafts: These mixers, and particularly the wand-type mixers, are supplied with mixing heads of different shapes which, respectively, can be attached to the shaft to carry out the desired operation; for example, operating heads intended for stirring of quite viscous substances, or combining of substances with each other, will have different shapes from those intended to cream substances, for example potatoes, or to beat eggwhites; or to whip cream. Other mixing heads may be used to chop substances, for example nuts, dried fruit and the like.
These removable mixing heads usually have a metal sleeve forcing a hub, adapted to be fitted over the operating Shaft. A groove dr notch may be provided in the hub sleeve, which is engaged lay a carrier pin formed on the shaft, to transmit torque and rotary motion. The operating head, in operation of the appliance, of course should be securely seated on the end of the shaft and must not inadvertently become loose or detached from the shaft. To assure such positive engagement, the hub is frequently provided with an elastically deformable region, for example defined by a pair of axially extending slits. This region is slightly deflected outwardly when the hub is engaged with the shaft, in order to provide resilient engagement force for frictional engagement of the remainder of the sleeve with the shaft. The resilient region, thus, in effect forms a springy tab or flap, separated from the remainder of the hub by the two longitudinal slits or cuts.
The hub is usually chamfered around the outer edge in order to facilitate attachment of the hub on the shaft.
It has been found in use that this arrangement, which is simple and effective and entirely adequate for most operating conditions, yet requires careful attention upon joining the operating head to the shaft. If the user tries to engage the operating head while the hub is at an inclination with respect to the axis of the shaft, and then forces the operating head on the shaft, the springy tab will be bent outwardly. This bend may remain set, by plastic deformation. As a consequence, secure frictional engagement of the attached operating head on the operating shaft is no longer ensured. The operating head, thus, may inadvertently become detached from the shaft. If the springy engagement tab is deformed, it is possible to return it to its initial position, for example by bending it backwards with pliers in order to again provide for springy engagement of the hub with the shaft, and so that the springy tab can again function as a force-applying element. Re-bending the tab, however, requires some dexterity and mechanical ability on part of the user, which cannot always be expected. Repeated bending of the tab, also, weakens the joint between the tab and the remainder of the hub, which may lead to failure of the operating head,. and permanent loss of springiness of the tab.
THE INVENTION.
It is an object to provide a kitchen appliance, and more particularly a hand mixer, having a projecting shaft in which the operating tool is so formed that it can be easily and simply fitted on the shaft without danger of unintended interference with the frictional engagement of the head with the shaft.
Briefly, the hand mixer is formed with a fast attachment and removal arrangement for the operating head to permit, upon attachment of the operating head, some misalignment with the shaft of the mixer without damage to the operating head, in which an essentially part-spherical section is formed on the terminating end of the end portion of the shaft which, as customary, is at least in part cylindrical. A shallow circumferential ring graove, which is wider than deep, is formed between the essentially spherical end section and an adjacent cylindrical section on the end portion of the shaft.
The location of the ring groove, with respect to the hub on the operating head, is so selected that when the operating head is engaged with the shaft, the ring groove is located within the hub.
Wand-type hand mixers frequently operate at very high speeds: the shaft may rotate at up to about 20,000 revolutions per minute (rpm). Such high speeds require precise cantering of the operating head on the shaft. If not accurately centered, the mixer will be noisy and unbalanced. The unbalance leads to stresses on the bearings of the shaft which, if extended, will damage the hand mixer. To ensure centered positioning of the operating head on the shaft, and in accordance with a preferred feature of the invention, a guide region or guide portion of shaft diameter is located between the circumferential groove and ~~~,~~J~.
the essentially spherical or part-spherical or ball-shaped termination of the shaft. This guide portion or guide region can be formed by a circumferential edge or a ridge, having the diameter of the shafts in accordance with a preferred feature, however'; the guide portion is a smooth cylindrical narrow section, having an axial length of at least 0.2 mm. ~:ustomary diameters of the shaft are about 6 mm; with such shafts, guide portions slightly longer than 0.2 mm prevent reduction of the diameter of the shaft end and the guide portion upon repeated 1o fitting of operating heads and removal of operating heads from the shaft. If the diameter of the guide,portion becomes reduced, its guiding functions are impaired. The guide region or guide portion ensures that the hub is reliably radially guided at bath sides of the circumferential groove or recess, when attached to the end portion of the shaft.
In accordance with a preferred feature of the invention, the ball-shaped terminal end of the shaft is formed part-spherical.
The circumferential ring groove should have a cross-sectional profile or shape which, starting from a minimum shaft diameter, that is, from maximum depth of the groove, defines a gradually outwardly expanding surface, which forms a positioning guide surface upon engagement of the operating head with the shaft, engageable by an inner edge of the hub, particularly when the hub is not placed on the shaft in centered alignment. The profile of the groove, in longitudinal section, preferably has an essentially circular curvature, having a center of curvature located outside of the diameter of the operating shaft. The radius. of the spherical or part-spherical end portion, preferably, is smaller than that of the radius of the circle defining the ring-shaped groove. These relationships effectively prevent excess stress on the resilient or flexible tab on the hub when the operating head is attached on the shaft, that is, that radial forces might arise which press the resilient tab outwardly with the above-described undesirable results. Preferably, the axial length of the spherical ball end is less than the axial length of the ring-shaped groove.
The attachment arrangement, as described, has the advantage that the hub will be self-centered upon engagement of the operating head with the shaft. Less care and attention on part of the user is required when fitting the operating head on the shaft. Even if the operating head is initially placed against the shaft at an inclination with respect to the shaft axis, the hub will slip automatically into axial alignment without overstressing the flexible frictional engagement tab on the hub.
This is particularly important for home appliances where the operating head needs to be removed frequently for cleaning or replacement with heads intended for different functions.
DRAWINGS:
Fig. 1 is a side view of a wand-type food mixer in accordance with the present invention:
Fig. 2 is a part-sectional view of the end portion of the mixer in the region of the free end of the shaft, to an enlarged scale;
Fig. 3 is a perspective view of operating head adapted to be fitted on the end portion of the mixer, shown in Fig. 2;
Fig. 4 shows the hub end of the operating head upon initial, misaligned engagement with the end portion of the shaft, to a still more enlarged scale; and Fig. 5 is a view similar to Fig. 4, and illustrating another misaligned positioning of the hub of the operating head with respect to the end portion of the shaft, and the centering effect of the arrangement in accordance with the present invention.
DETAILED DESCRTPTION.
The wand-type hand mixer illustrated in Fig. 1 has an essentially cylindrical housing 1 formed with a hand holding portion 2 at the top and one side thereof. The apparatus is so ~~.a.~~~1 shaped that it can be grasped by one hand, as illustrated in Fig. 1. The lower portion of the housing terminates in a conical section 3 to which a protective tube or sleeve 4 is attached, terminating in a protective cover shroud 6 having legs 9, which are shaped as wings to promote mixing of substances. The shaft 6, usually, has a diameter of about 6 mm. An electric motor, not shown, is located within the housing 1 and coupled to the shaft by a suitable gearing. The shaft 6, see Fig. 2, is journalled at its lower end in a bearing 7. A carrier pin 8 is fitted into the shaft, located within the bell-shaped shroud 5, as clearly seen in Fig. 2. The legs 9 are wing-shaped; preferably, four legs are provided, radially spaced from the shaft 6, and so shaped that the flow conditions of substances located in the region of the bottom end of the shaft 6, when an operating head H is attached thereto, will be influenced thereby; additionally, they provide protection for the operating head.
Fig. 3 is a perspective view of one type of operating head used, for example, for beating or whipping. The head H is formed as a circular disk 11, with part-spherical projections 12 extending therefrom. A coaxial hub l3 projects at right angle from the disk 11. The hub 13 is preferably made of steel, that is, a springy elastic material, and forms an attachment sleeve.
Two parallel axially extending slits 14 are formed in the hub which define a spring flap or tab 15, which is biassed slightly inwardly, and when fitted on the end portion 10 of the shaft 6 ensures frictional engagement of the operating head H with the shaft 6. The edge of the sleeve or hub 13 is formed with a chamfer l6, in conical form (see also Figs. 4 and 5). The hub 13 is formed with an open notch 17, for engagement with pin 8 on the a shaft end 10 of the shaft 6, and to ensure a rotation transmitting engagement between the shaft and the operating head.
In accordance with a feature of the invention, the shaft end 10 is formed with a circumferentially extending or ring-shaped ~~~~3~~~
depression or groove 18. The groove 18 is formed at the end portion 10 of the shaft, outwardly, with respect to the motor within the housing 1, of the pin 8. The terminal end or tip of the end portion 10 of shaft 6 is formed by a ball-shaped or part-s spherical portion 19, which extends up to the tip end face.20 of the end portion 10 of the shaft 6.
The surface of groove 18 is smooth, see Figs. 4 and 5. The groove is shallow, and wider than deep.
The groove 18 in cross section is given a particular profile or shape. In longitudinal section, it is essentially circularly curved, with a radius of curvature 20° (Fig. 4). The diameter of the groove, at its deepest point, is shown at 21, located approximately axially in the middle of the lateral ends of the groove. l8 .
The ball -shaped end 19 of the shaft 6 is formed, essentially, as a portion of a sphere. The radius 22 of the sphere is smaller than the radius of curvature 20' of the groove 18. In a shaft of about 6 mm diameter, the radius of curvature 22 is about 4 mm. The radius 20' of the groove 18 is about 5.1 mm. Figs. 4 and 5 best illustrate that the axial length of the ball-shaped pox-tion 19 is substantially less than the axial length of the groove 18 and, preferably, about one-quarter of the axial length of groove 18.
In accordance with a feature of the invention, a smooth-walled cylindrical guide region 23 is located between the groove 18 and the ball-shaped end portion. The diameter of the guide region or guide ring 23 is equal to the diameter of the shaft 6 in the-region ofrthe end 10 of the shaft. Its axial length is small in comparison to the axial length of the groove 18 and, for a shaft of about 6 mm diameter, is 0.2 mm or slightly more.
Thus, the axial length of the guide ring 23 is less than the axial length of the ball-shaped end portion 19 as is clearly apparent from Figs. 4 and 5.
93 0F3 o8-shf PA i uaA sg "WAND-TYPE HAND MIXER HAVING A REMOVABLE
OPERATING HEAD"
FIELD OF THE INVENTION.
The present invention relates to a kitchen appliance, and more particularly to a hand mixer of the wand type, that. is, a hand mixer,having a motor in a housing adapted to be gripped by the user. A shaft extends from the housing, in line or coaxial with the shaft of the motor. A mixing head having a tubular coupling extension can be attached to the motor shaft, for immersion in materials to be treated upon rapid rotation of the mixing head.
10' BACKGROUND.
Mixers of this type are used for folding, stirring, mixing, combining, blending, whipping, emulsifying, homogenizing and beating of substances retained in a bowl. Mixers of this kind;
if they have one shaft, are also referred to as wand-type mixers:
others have two parallel shafts: These mixers, and particularly the wand-type mixers, are supplied with mixing heads of different shapes which, respectively, can be attached to the shaft to carry out the desired operation; for example, operating heads intended for stirring of quite viscous substances, or combining of substances with each other, will have different shapes from those intended to cream substances, for example potatoes, or to beat eggwhites; or to whip cream. Other mixing heads may be used to chop substances, for example nuts, dried fruit and the like.
These removable mixing heads usually have a metal sleeve forcing a hub, adapted to be fitted over the operating Shaft. A groove dr notch may be provided in the hub sleeve, which is engaged lay a carrier pin formed on the shaft, to transmit torque and rotary motion. The operating head, in operation of the appliance, of course should be securely seated on the end of the shaft and must not inadvertently become loose or detached from the shaft. To assure such positive engagement, the hub is frequently provided with an elastically deformable region, for example defined by a pair of axially extending slits. This region is slightly deflected outwardly when the hub is engaged with the shaft, in order to provide resilient engagement force for frictional engagement of the remainder of the sleeve with the shaft. The resilient region, thus, in effect forms a springy tab or flap, separated from the remainder of the hub by the two longitudinal slits or cuts.
The hub is usually chamfered around the outer edge in order to facilitate attachment of the hub on the shaft.
It has been found in use that this arrangement, which is simple and effective and entirely adequate for most operating conditions, yet requires careful attention upon joining the operating head to the shaft. If the user tries to engage the operating head while the hub is at an inclination with respect to the axis of the shaft, and then forces the operating head on the shaft, the springy tab will be bent outwardly. This bend may remain set, by plastic deformation. As a consequence, secure frictional engagement of the attached operating head on the operating shaft is no longer ensured. The operating head, thus, may inadvertently become detached from the shaft. If the springy engagement tab is deformed, it is possible to return it to its initial position, for example by bending it backwards with pliers in order to again provide for springy engagement of the hub with the shaft, and so that the springy tab can again function as a force-applying element. Re-bending the tab, however, requires some dexterity and mechanical ability on part of the user, which cannot always be expected. Repeated bending of the tab, also, weakens the joint between the tab and the remainder of the hub, which may lead to failure of the operating head,. and permanent loss of springiness of the tab.
THE INVENTION.
It is an object to provide a kitchen appliance, and more particularly a hand mixer, having a projecting shaft in which the operating tool is so formed that it can be easily and simply fitted on the shaft without danger of unintended interference with the frictional engagement of the head with the shaft.
Briefly, the hand mixer is formed with a fast attachment and removal arrangement for the operating head to permit, upon attachment of the operating head, some misalignment with the shaft of the mixer without damage to the operating head, in which an essentially part-spherical section is formed on the terminating end of the end portion of the shaft which, as customary, is at least in part cylindrical. A shallow circumferential ring graove, which is wider than deep, is formed between the essentially spherical end section and an adjacent cylindrical section on the end portion of the shaft.
The location of the ring groove, with respect to the hub on the operating head, is so selected that when the operating head is engaged with the shaft, the ring groove is located within the hub.
Wand-type hand mixers frequently operate at very high speeds: the shaft may rotate at up to about 20,000 revolutions per minute (rpm). Such high speeds require precise cantering of the operating head on the shaft. If not accurately centered, the mixer will be noisy and unbalanced. The unbalance leads to stresses on the bearings of the shaft which, if extended, will damage the hand mixer. To ensure centered positioning of the operating head on the shaft, and in accordance with a preferred feature of the invention, a guide region or guide portion of shaft diameter is located between the circumferential groove and ~~~,~~J~.
the essentially spherical or part-spherical or ball-shaped termination of the shaft. This guide portion or guide region can be formed by a circumferential edge or a ridge, having the diameter of the shafts in accordance with a preferred feature, however'; the guide portion is a smooth cylindrical narrow section, having an axial length of at least 0.2 mm. ~:ustomary diameters of the shaft are about 6 mm; with such shafts, guide portions slightly longer than 0.2 mm prevent reduction of the diameter of the shaft end and the guide portion upon repeated 1o fitting of operating heads and removal of operating heads from the shaft. If the diameter of the guide,portion becomes reduced, its guiding functions are impaired. The guide region or guide portion ensures that the hub is reliably radially guided at bath sides of the circumferential groove or recess, when attached to the end portion of the shaft.
In accordance with a preferred feature of the invention, the ball-shaped terminal end of the shaft is formed part-spherical.
The circumferential ring groove should have a cross-sectional profile or shape which, starting from a minimum shaft diameter, that is, from maximum depth of the groove, defines a gradually outwardly expanding surface, which forms a positioning guide surface upon engagement of the operating head with the shaft, engageable by an inner edge of the hub, particularly when the hub is not placed on the shaft in centered alignment. The profile of the groove, in longitudinal section, preferably has an essentially circular curvature, having a center of curvature located outside of the diameter of the operating shaft. The radius. of the spherical or part-spherical end portion, preferably, is smaller than that of the radius of the circle defining the ring-shaped groove. These relationships effectively prevent excess stress on the resilient or flexible tab on the hub when the operating head is attached on the shaft, that is, that radial forces might arise which press the resilient tab outwardly with the above-described undesirable results. Preferably, the axial length of the spherical ball end is less than the axial length of the ring-shaped groove.
The attachment arrangement, as described, has the advantage that the hub will be self-centered upon engagement of the operating head with the shaft. Less care and attention on part of the user is required when fitting the operating head on the shaft. Even if the operating head is initially placed against the shaft at an inclination with respect to the shaft axis, the hub will slip automatically into axial alignment without overstressing the flexible frictional engagement tab on the hub.
This is particularly important for home appliances where the operating head needs to be removed frequently for cleaning or replacement with heads intended for different functions.
DRAWINGS:
Fig. 1 is a side view of a wand-type food mixer in accordance with the present invention:
Fig. 2 is a part-sectional view of the end portion of the mixer in the region of the free end of the shaft, to an enlarged scale;
Fig. 3 is a perspective view of operating head adapted to be fitted on the end portion of the mixer, shown in Fig. 2;
Fig. 4 shows the hub end of the operating head upon initial, misaligned engagement with the end portion of the shaft, to a still more enlarged scale; and Fig. 5 is a view similar to Fig. 4, and illustrating another misaligned positioning of the hub of the operating head with respect to the end portion of the shaft, and the centering effect of the arrangement in accordance with the present invention.
DETAILED DESCRTPTION.
The wand-type hand mixer illustrated in Fig. 1 has an essentially cylindrical housing 1 formed with a hand holding portion 2 at the top and one side thereof. The apparatus is so ~~.a.~~~1 shaped that it can be grasped by one hand, as illustrated in Fig. 1. The lower portion of the housing terminates in a conical section 3 to which a protective tube or sleeve 4 is attached, terminating in a protective cover shroud 6 having legs 9, which are shaped as wings to promote mixing of substances. The shaft 6, usually, has a diameter of about 6 mm. An electric motor, not shown, is located within the housing 1 and coupled to the shaft by a suitable gearing. The shaft 6, see Fig. 2, is journalled at its lower end in a bearing 7. A carrier pin 8 is fitted into the shaft, located within the bell-shaped shroud 5, as clearly seen in Fig. 2. The legs 9 are wing-shaped; preferably, four legs are provided, radially spaced from the shaft 6, and so shaped that the flow conditions of substances located in the region of the bottom end of the shaft 6, when an operating head H is attached thereto, will be influenced thereby; additionally, they provide protection for the operating head.
Fig. 3 is a perspective view of one type of operating head used, for example, for beating or whipping. The head H is formed as a circular disk 11, with part-spherical projections 12 extending therefrom. A coaxial hub l3 projects at right angle from the disk 11. The hub 13 is preferably made of steel, that is, a springy elastic material, and forms an attachment sleeve.
Two parallel axially extending slits 14 are formed in the hub which define a spring flap or tab 15, which is biassed slightly inwardly, and when fitted on the end portion 10 of the shaft 6 ensures frictional engagement of the operating head H with the shaft 6. The edge of the sleeve or hub 13 is formed with a chamfer l6, in conical form (see also Figs. 4 and 5). The hub 13 is formed with an open notch 17, for engagement with pin 8 on the a shaft end 10 of the shaft 6, and to ensure a rotation transmitting engagement between the shaft and the operating head.
In accordance with a feature of the invention, the shaft end 10 is formed with a circumferentially extending or ring-shaped ~~~~3~~~
depression or groove 18. The groove 18 is formed at the end portion 10 of the shaft, outwardly, with respect to the motor within the housing 1, of the pin 8. The terminal end or tip of the end portion 10 of shaft 6 is formed by a ball-shaped or part-s spherical portion 19, which extends up to the tip end face.20 of the end portion 10 of the shaft 6.
The surface of groove 18 is smooth, see Figs. 4 and 5. The groove is shallow, and wider than deep.
The groove 18 in cross section is given a particular profile or shape. In longitudinal section, it is essentially circularly curved, with a radius of curvature 20° (Fig. 4). The diameter of the groove, at its deepest point, is shown at 21, located approximately axially in the middle of the lateral ends of the groove. l8 .
The ball -shaped end 19 of the shaft 6 is formed, essentially, as a portion of a sphere. The radius 22 of the sphere is smaller than the radius of curvature 20' of the groove 18. In a shaft of about 6 mm diameter, the radius of curvature 22 is about 4 mm. The radius 20' of the groove 18 is about 5.1 mm. Figs. 4 and 5 best illustrate that the axial length of the ball-shaped pox-tion 19 is substantially less than the axial length of the groove 18 and, preferably, about one-quarter of the axial length of groove 18.
In accordance with a feature of the invention, a smooth-walled cylindrical guide region 23 is located between the groove 18 and the ball-shaped end portion. The diameter of the guide region or guide ring 23 is equal to the diameter of the shaft 6 in the-region ofrthe end 10 of the shaft. Its axial length is small in comparison to the axial length of the groove 18 and, for a shaft of about 6 mm diameter, is 0.2 mm or slightly more.
Thus, the axial length of the guide ring 23 is less than the axial length of the ball-shaped end portion 19 as is clearly apparent from Figs. 4 and 5.
Operation and assembl5r of a selected operating head H:
Attempting to fit an operating head H on the shaft 10 such that the axis 27 of the hub 13 is at an inclination with respect to the axis 25 of the shaft 6, is best seen in Fig. 5. The chamfered end 16 of the hub 13 initially engages the concave circumferential surface of the groove 18 in a region above the minimum diameter 21 of the groove 18. Due to the ball-shaped end portion 1~, this inclined engagement is permitted. This engagement is possible without applying any spreading force l0 against the inner wall of the hub 13t hence no spreading force on the spring tab or flap 15 (Fig. 3) will. be applied.
Upon further axial engagement, the edge 24 at the lower end of the chamfer 16 slides on the circumferential surface of the groove 18 which, in this region, has a diameter larger than the diameter 21 (see Fig. 4), thus automatically aligning the hub 13 with its hub axis 27 with the axis 25 of the shaft 6, and its end portion l0.
The foregoing effect is easily seen when comparing Figs. 5 and 4, in which Fig. 4 illustrates the position in which the hub is engaged on the shaft by an axially increased distance.
When the,edge 24 reaches, finally reaches the end of the groove 18 closest to the motor, hub 13 is in exact alignment with the axis of the shaft 6 and its end portion 10. As the hub is further pushed on the end of the shaft, the cylindrical inner wall of the hub 13 will fit exactly, coaxially, on the end portion 10 of the shaft 6. The attachment process is terminated as soon as the engagement pin 8 (Fig. 1) engages in the notch 17, thereby providing rotation-transmitting coupling between the shaft and the hub and secure axial seating. When the end portion 10 of the shaft is so seated in the head H, the groove 18 is located within the hub 13. The hub 13 is guided on both sides of the groove 18, on the upper end by the shaft end 10 itself, and on the lower end, that is, beyond the groove 18, by the guide region or guide ring 23. These surfaces provide for precise axial alignment and radial guidance. The axial position of the hub 13 is ensured by the radial bias of the spring flap or tab 15 against the end portion 10 of the shaft 6 and the resultant frictional engagement.
The invention has been described with reference to a wand type mixer, but is equally applicable to other types of mixers.
Various changes and modifications may be made, and any features described herein may be used with any of the others, within the scope of the inventive concept.
The radius of curvature 20' of the ~.roove 18, preferably, is between about 75% to 150% of the diameter of the shaft 6. The depth of the groove, measured at the minimum diameter 21, preferably is between about 4% to 8% of the shaft diameter.
Attempting to fit an operating head H on the shaft 10 such that the axis 27 of the hub 13 is at an inclination with respect to the axis 25 of the shaft 6, is best seen in Fig. 5. The chamfered end 16 of the hub 13 initially engages the concave circumferential surface of the groove 18 in a region above the minimum diameter 21 of the groove 18. Due to the ball-shaped end portion 1~, this inclined engagement is permitted. This engagement is possible without applying any spreading force l0 against the inner wall of the hub 13t hence no spreading force on the spring tab or flap 15 (Fig. 3) will. be applied.
Upon further axial engagement, the edge 24 at the lower end of the chamfer 16 slides on the circumferential surface of the groove 18 which, in this region, has a diameter larger than the diameter 21 (see Fig. 4), thus automatically aligning the hub 13 with its hub axis 27 with the axis 25 of the shaft 6, and its end portion l0.
The foregoing effect is easily seen when comparing Figs. 5 and 4, in which Fig. 4 illustrates the position in which the hub is engaged on the shaft by an axially increased distance.
When the,edge 24 reaches, finally reaches the end of the groove 18 closest to the motor, hub 13 is in exact alignment with the axis of the shaft 6 and its end portion 10. As the hub is further pushed on the end of the shaft, the cylindrical inner wall of the hub 13 will fit exactly, coaxially, on the end portion 10 of the shaft 6. The attachment process is terminated as soon as the engagement pin 8 (Fig. 1) engages in the notch 17, thereby providing rotation-transmitting coupling between the shaft and the hub and secure axial seating. When the end portion 10 of the shaft is so seated in the head H, the groove 18 is located within the hub 13. The hub 13 is guided on both sides of the groove 18, on the upper end by the shaft end 10 itself, and on the lower end, that is, beyond the groove 18, by the guide region or guide ring 23. These surfaces provide for precise axial alignment and radial guidance. The axial position of the hub 13 is ensured by the radial bias of the spring flap or tab 15 against the end portion 10 of the shaft 6 and the resultant frictional engagement.
The invention has been described with reference to a wand type mixer, but is equally applicable to other types of mixers.
Various changes and modifications may be made, and any features described herein may be used with any of the others, within the scope of the inventive concept.
The radius of curvature 20' of the ~.roove 18, preferably, is between about 75% to 150% of the diameter of the shaft 6. The depth of the groove, measured at the minimum diameter 21, preferably is between about 4% to 8% of the shaft diameter.
Claims (17)
1. Hand mixer for combination with a selectively removable operating head (H), said hand mixer having a housing (1) having a shaft guiding portion (4); a motor-driven shaft (6) located within the shaft guiding portion, said shaft having an essentially cylindrical end portion (10) adapted to selectively removably receive said operating head (H), and including rotation transmitting coupling means (8), said operating head (H) having an essentially cylindrical hub (13), said hub (13) being adapted to be selectively removably fitted on said end portion of the shaft, and engageable with said rotation-transmitting coupling means, and at least one of: said hub and said shaft, having resilient means (14, 15) for mutual frictional engagement of said hub (13) on said shaft end portion (10), and wherein, in accordance with the invention, said hand mixer is formed with a fast attachment arrangement for the coupling head (H) while permitting unintended misalignment of the operating head with the hand mixer during attachment, said attachment arrangement comprising an essentially ball-shaped section (19) terminating the end portion (10) of said shaft (6); said end portion (10) of the shaft (6) being, at least in part, cylindrical; and a shallow, circumferential ring groove (18), which is wider than deep, formed between the essentially spherical or ball-shaped end portion (19) and a cylindrical region of the end portion (10) of the shaft (6).
2. The hand mixer of claim 1, including an essentially cylindrical guide ring or strip (23) formed on the end portion (10) of the shaft (6) between said circumferential ring groove (18) and the essentially ball-shaped end portion (19), said guide ring or strip (23) having a diameter essentially identical to the diameter of the end portion (10) of the shaft (6).
3. The hand mixer of claim 2, wherein said guide ring or strip (23) has smooth outer walls.
4. The hand mixer of claim 3, wherein the axial length of said guide ring or strip (23) is at least 0.2 mm.
5. The hand mixer of claim 1, wherein said essentially ball-shaped end portion (19) is formed in part-spherical shape.
6. The hand mixer of claim 1, wherein the hub (13) of the operating head (H) has an open end including an inner edge (24) defining a guide surface; and wherein the circumferential groove (18), in axial cross section, has a minimum diameter (21) which is less than the diameter of the end portion (10) of said shaft (6), and is shaped to define guide surfaces which gradually smoothly increase towards the diameter of said end portion (10), and forming a groove guide surface for said inner edge (24) formed on the hub (13).
7. The hand mixer of claim 1, wherein, in axial cross section, the groove (18) is shaped in form of an essentially circular curve, having a radius of curvature located at a theoretical center (20') outside of the shaft (6).
8. The hand mixer of claim 7, wherein the essentially ball-shaped end portion (19) is part-spherically shaped with a spherical radius which is less than the radius of curvature of the ring groove (18).
9. The hand mixer of claim 1, wherein the axial length of the essentially ball-shaped end portion (19) is less than the axial length of said ring-shaped groove (18).
10. The hand mixer of claim 1, wherein the surfaces defining said ring-shaped groove are smooth.
11. The hand mixer of claim 1, wherein a portion (15) of a wall defining said hub (13) is radially, resiliently deflectable to form said resilient means (14, 15) for frictional engagement with at least part of the end portion (10) of said shaft (6).
12. The hand mixer of claim 6, including an essentially cylindrical guide ring or strip (23) formed on the end portion (10) of the shaft (6) between said circumferential ring groove (18) and the essentially ball-shaped end portion (19), said guide ring or strip (23) having a diameter essentially identical to the diameter of the end portion (10) of the shaft (6).
13. The hand mixer of claim 12, wherein said guide ring or strip has smooth outer walls and is cylindrical in cross section.
14. The hand mixer of claim 12, wherein the axial length of said guide ring or strip (23) is at least 0.2 mm.
15. The hand mixer of claim 12, wherein the axial length of the essentially ball-shaped end portion (19) is less than the axial length of said ring-shaped groove (18).
16. The hand mixer of claim 7, wherein the radius of curvature of the ring-shaped groove (18) is between about 75% to 150% of the diameter of the shaft (6).
17. The hand mixer of claim 6, wherein the depth of the groove (18), measured at its minimum diameter, is between about 4% to 8% of the diameter of the end portion (10) of the shaft (6).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4301209A DE4301209C2 (en) | 1993-01-19 | 1993-01-19 | Hand mixer |
| DEP4301209.4 | 1993-01-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2113691A1 CA2113691A1 (en) | 1994-07-20 |
| CA2113691C true CA2113691C (en) | 2002-11-12 |
Family
ID=6478431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002113691A Expired - Lifetime CA2113691C (en) | 1993-01-19 | 1994-01-18 | Wand-type hand mixer having a removable operating head |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US5366286A (en) |
| EP (1) | EP0607507B1 (en) |
| JP (1) | JP3426014B2 (en) |
| KR (1) | KR100296532B1 (en) |
| AT (1) | ATE130507T1 (en) |
| AU (1) | AU669954B2 (en) |
| CA (1) | CA2113691C (en) |
| DE (2) | DE4301209C2 (en) |
| DK (1) | DK0607507T3 (en) |
| ES (1) | ES2081676T3 (en) |
| GR (1) | GR3018315T3 (en) |
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| DE4436092C1 (en) * | 1994-10-10 | 1995-11-30 | Braun Ag | Food processing and mixing unit, protected against food ingress, |
| DE19504638A1 (en) * | 1995-02-13 | 1996-08-14 | Braun Ag | Process for a working device, in particular a hand blender, for stirring or chopping food in a container |
| DE19729446A1 (en) * | 1997-07-09 | 1999-01-14 | Braun Ag | Tool for stirring or chopping food |
| CZ295833B6 (en) * | 1997-07-16 | 2005-11-16 | Robot-Coupe (S. N. C.) | Submersible mixer |
| US5863118A (en) * | 1997-07-29 | 1999-01-26 | Conair Corporation | Blender with extendible housing |
| DE19750813C2 (en) * | 1997-11-17 | 2002-06-13 | Braun Gmbh | Tool for stirring or chopping food, especially hand blenders |
| DE19812541A1 (en) | 1998-03-21 | 1999-09-30 | Braun Gmbh | Bell-shaped shield for use in a household appliance, in particular a hand mixer or hand mixer |
| DE10114373A1 (en) * | 2001-03-23 | 2002-10-10 | Braun Gmbh | Hand or hand mixer with coupling device |
| ES2182707B2 (en) * | 2001-07-03 | 2004-02-01 | Irimartek S A | CRUSHER ARM WITH REMOVABLE EXTREME FOR CLEANING |
| US6719450B2 (en) * | 2002-04-19 | 2004-04-13 | Bonjour, Incorporated | Processing tool attachments for a food mixing device |
| US6974244B1 (en) | 2002-11-15 | 2005-12-13 | King-Yuan Lin | Hand-held wand mixer |
| US7021817B2 (en) * | 2003-04-02 | 2006-04-04 | Premark Feg L.L.C. | Mixing element with keyway attachment and mixer including mixing element |
| JP4101718B2 (en) * | 2003-08-07 | 2008-06-18 | 株式会社貝印刃物開発センター | Hand mixer |
| US7172334B2 (en) * | 2003-12-11 | 2007-02-06 | Conair Corporation | Hand held blender |
| US20060185124A1 (en) * | 2005-02-18 | 2006-08-24 | Kozlowski Keith A | Joint assembly with centering flange |
| FR2891449B1 (en) * | 2005-10-04 | 2007-11-23 | Seb Sa | MIXER FOOT AND MIXER MIXER TYPE OF DIVING PROVIDED WITH SUCH A FOOT OF MIXING |
| EP1836992A1 (en) | 2006-03-10 | 2007-09-26 | 3M Innovative Properties Company | Mixing device and drive for the mixing device |
| FR2912891B1 (en) * | 2007-02-22 | 2012-08-10 | Seb Sa | FILTER FOR THE PRODUCTION OF CRUSHED ICE USING A DIVERSE MIXER AND DEVICE FOR THE PRODUCTION OF CRUSHED ICE PROVIDED WITH SUCH A FILTER |
| US7866879B2 (en) * | 2007-05-24 | 2011-01-11 | Moschetti Mitchell R | Immersion blender spatula ring |
| TWM342130U (en) * | 2007-11-30 | 2008-10-11 | Tsann Kuen Entpr Co Ltd | Compound food-processor |
| US20100309746A1 (en) * | 2009-06-05 | 2010-12-09 | Andersson Per-Olof K | Ultraclean Magnetic Mixer with Shear-Facilitating Blade Openings |
| US8814423B2 (en) * | 2009-08-21 | 2014-08-26 | Michael Henry Silvers | Handle |
| GB0915007D0 (en) * | 2009-08-28 | 2009-09-30 | 3M Innovative Properties Co | Mixer and system for mixing and dispensing material |
| DE102013217688A1 (en) | 2013-09-04 | 2015-03-05 | BSH Bosch und Siemens Hausgeräte GmbH | Component and tool of a kitchen appliance |
| US9642494B1 (en) | 2013-10-21 | 2017-05-09 | Kevin Brun | Radial immersion blender |
| GB2519805B (en) * | 2013-10-31 | 2018-08-01 | Kenwood Ltd | Food-processing tools and food-processing appliances incorporating same |
| JP5995006B2 (en) * | 2013-11-22 | 2016-09-21 | Ｊｆｅスチール株式会社 | Impeller replacement device for mechanical stirring desulfurization equipment |
| KR101712664B1 (en) * | 2014-12-12 | 2017-03-07 | 최상민 | A blender and mixing vessel for forming coffee and manufacturing method |
| SE538749C2 (en) * | 2015-06-30 | 2016-11-08 | Atlas Copco Ind Technique Ab | Electric power tool |
| JP2019176943A (en) * | 2018-03-30 | 2019-10-17 | シャープ株式会社 | Grip type electric equipment |
| USD906754S1 (en) * | 2019-07-15 | 2021-01-05 | Peng Zhu | Mixer |
| USD923404S1 (en) | 2019-07-29 | 2021-06-29 | Whirlpool Corporation | Pan guard for hand blender |
| USD963400S1 (en) * | 2020-04-20 | 2022-09-13 | Midea Group Co., Ltd. | Hand blender |
| CA200816S (en) * | 2020-05-25 | 2021-11-24 | Midea Group Co Ltd | Hand blender |
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| FR1117914A (en) * | 1954-01-16 | 1956-05-29 | Sovico | Motor-driven household appliance for culinary uses |
| DE1119476B (en) * | 1957-10-26 | 1961-12-14 | Bosch Gmbh Robert | Kitchen machine with rotating tools |
| DE1182399B (en) * | 1960-10-06 | 1964-11-26 | Electrische App Nfabriek Esgee | Stick-shaped hand mixer chopper |
| DE1174949B (en) * | 1962-12-06 | 1964-07-30 | Siemens Elektrogeraete Gmbh | Device for chopping fruits u. like |
| DE1242817B (en) * | 1963-04-27 | 1967-06-22 | Esge Ges Mit Beschraenkter Haf | Electric motor-driven hand mixer |
| DE1765924A1 (en) * | 1968-08-08 | 1972-01-05 | Merten Geb | Combination of several electrical installation devices |
| DE7933483U1 (en) * | 1979-11-28 | 1981-05-21 | Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart | KNEADING TOOL, IN PARTICULAR KNETHAKE FOR HOUSEHOLD KITCHEN MACHINES |
| FR2515021B1 (en) * | 1981-10-28 | 1986-04-18 | Moulinex Sa | HOUSEHOLD MIXER |
| DE3709573C3 (en) * | 1987-03-24 | 1994-08-04 | Braun Ag | ROD MIXER |
| US4832573A (en) * | 1987-11-27 | 1989-05-23 | General Motors Corporation | Integral connection for plastic water pump impeller |
-
1993
- 1993-01-19 DE DE4301209A patent/DE4301209C2/en not_active Expired - Fee Related
- 1993-10-23 EP EP93117219A patent/EP0607507B1/en not_active Expired - Lifetime
- 1993-10-23 DK DK93117219.1T patent/DK0607507T3/en active
- 1993-10-23 ES ES93117219T patent/ES2081676T3/en not_active Expired - Lifetime
- 1993-10-23 DE DE59301007T patent/DE59301007D1/en not_active Expired - Lifetime
- 1993-10-23 AT AT93117219T patent/ATE130507T1/en active
- 1993-12-16 US US08/168,651 patent/US5366286A/en not_active Expired - Lifetime
-
1994
- 1994-01-14 AU AU53811/94A patent/AU669954B2/en not_active Expired
- 1994-01-17 JP JP00304094A patent/JP3426014B2/en not_active Expired - Lifetime
- 1994-01-18 CA CA002113691A patent/CA2113691C/en not_active Expired - Lifetime
- 1994-01-19 KR KR1019940000911A patent/KR100296532B1/en not_active IP Right Cessation
-
1995
- 1995-12-05 GR GR950403435T patent/GR3018315T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| KR100296532B1 (en) | 2001-10-24 |
| CA2113691A1 (en) | 1994-07-20 |
| AU669954B2 (en) | 1996-06-27 |
| EP0607507B1 (en) | 1995-11-22 |
| GR3018315T3 (en) | 1996-03-31 |
| US5366286A (en) | 1994-11-22 |
| DK0607507T3 (en) | 1996-01-22 |
| KR940018053A (en) | 1994-08-16 |
| DE4301209C2 (en) | 1995-06-08 |
| ES2081676T3 (en) | 1996-03-16 |
| JP3426014B2 (en) | 2003-07-14 |
| DE59301007D1 (en) | 1996-01-04 |
| EP0607507A1 (en) | 1994-07-27 |
| ATE130507T1 (en) | 1995-12-15 |
| JPH0767794A (en) | 1995-03-14 |
| AU5381194A (en) | 1994-07-28 |
| DE4301209A1 (en) | 1994-07-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20140120 |