Patent Application
20190368565
This invention relates to personal care appliances, such as razors and shaving devices, and more particularly to springs for use in such appliances.
In many small consumer appliances, such as razors and shaving devices, there is a cartridge component which is permanently or removably attached to a handle. In the case of razors, the cartridge includes the cutting blades. The cartridge and the handle move relative to each other to allow the cartridge to follow the contours of the skin and cut more hairs more efficiently.
The cartridge in many commercially available razors pivots relative to the handle. The pivot mechanisms may be accomplished by a spring or spring mechanism. The pivot mechanism of the prior art generally comprises an up and down (or forward and back) movement of the cartridge relative to the handle while another pivot mechanism of the prior art may generally comprise a side to side (or left and right) movement of the cartridge relative to the handle. Some premium commercial razors incorporate both types of movement such that the cartridge can move both up and down and side to side.
Springs or spring mechanisms may also be included in a component or feature that serves to remove, separate, or eject the cartridge from the handle. For instance, an eject button or release fingers can be found in a razor where the cartridge can be removed from the handle (e.g., the removable type where the cartridge is disposed of but the handle is kept by the consumer). Typically, the eject button or the release fingers have some spring or spring mechanism. The eject buttons of the prior art generally allow for the user to move the button forward from an initial point with the button typically springing back to the same initial point in the process of releasing a cartridge from a handle. This movement is generally along a linear path. Generally, the travel distance that an eject button of the prior art travels is about 1 mm to about 2 mm.
Many current razors use coil springs or straight springs (e.g., a straight beam) to assist in the eject or pivot functionality. These springs generally occupy a lot of volume and their short length does not allow for large deflections, bending, or long travel distances without exceeding the yield stresses and strains of the spring. If an increase in user benefits is desired in the razor which would require space, the spring members of the prior art may be inadequate due to fatigue or permanent deformation.
Further, the springs of the prior art are generally separated per function, such that there is typically a spring utilized for pivot movement and a different one for eject movement.
Often, if a razor is accidentally dropped, many components of the razor may be damaged. For instance, the cartridge or blades may bend or fall out of place, the eject button may not be able to move appropriately thereafter, or the spring or spring mechanism helping pivot or eject functions may be compromised. Subsequently, the razor may become unsafe for a consumer to use.
Thus, the prior art springs and spring mechanisms have some disadvantages in cost, size, shape, capability, and complexity. First, in many prior art devices, as mentioned above, having separate springs for different razor functions such as pivoting and ejection, adds components and thus cost and complexity to the device. In some instances, when additional benefits are added to the razor, the current springs or spring mechanisms may be inappropriate. Further, the spring capabilities and the eject function may diminish with use and with accidental drops.
A robust and improved spring member and spring mechanism and components to provide desired functionalities in a razor is needed which also provide the consumer with a much more pleasant operational experience.
The present invention is directed to a razor which includes a cartridge, a handle coupled to the cartridge, a loop shaped spring member disposed in an assembly, the assembly having one or more movable portions wherein the one or more movable portions, the one or more movable portions provide an angular rotation of the handle to the cartridge. In one aspect, the cartridge and the handle pivot relative to each other.
In an embodiment, the loop shaped spring member includes a circular, oval, elliptical, ring shape, modified V-shape, tear drop shape, or any combination thereof. The loop shaped spring member has an overall length of about 30 mm to about 90 mm when straightened. The loop shaped spring member has radii of curvature between about 1 mm to about 12 mm. The loop shaped spring member includes distal ends which are spaced apart. In one aspect, the loop shaped spring member has overlapping end portions. The first and second distal ends of the loop shaped spring member contact first and second stop walls of the assembly when the assembly is in a rest position. The one or both distal ends of the loop shaped spring member move away from one or more stop walls of the assembly during the angular rotation.
The angular rotation is up to 30 degrees from a center of the assembly. A stiffness coefficient of the angular rotation about the second axis is about 0.0833 N-mm/degree per unit distance from the first axis to the second axis.
In one embodiment, the loop shaped spring member is fully encompassed within the assembly.
The razor further includes a skin interconnect member.
In one aspect, the loop shaped spring member is made of a stainless steel.
In another, the loop shaped spring member is made of flat wire.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described below. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety. In case of conflict, the present specification, including definitions, will control. In addition, the materials, methods, and examples are illustrative only and not intended to be limiting.
Other features and advantages of the invention will be apparent from the following detailed description, and from the claims.
While the specification concludes with claims particularly pointing out and distinctly claiming the subject matter which is regarded as forming the present invention, it is believed that the invention will be better understood from the following description which is taken in conjunction with the accompanying drawings in which like designations are used to designate substantially identical elements, and in which:
The novel spring members or spring mechanisms of the present invention are described herein. A loop-shaped spring member of the present invention provides many advantages in a razor. For instance, the eject functionality of many razors includes a button that is moved forward a travel distance to reach a component or surface of the cartridge to eject or release a cartridge from a handle. The eject button may need to travel a long travel distance (e.g., a long ejection stroke) to reach the cartridge and a long distance to return to a rest position. A long distance may be a distance greater than 2.5 mm and usually in the 4 mm to 10 mm range. The eject button in many razors is disposed in a small space in the razor. The spring member of the present invention having a loop shape provides many advantages to a razor with eject mechanisms. For one, the loop shape allows extension and compression to occur without exceeding the yield strains and stresses of the spring member. The fatigue of the spring member is reduced. The loop shape also allows large extension and compression with low forces that are consumer acceptable while providing enough force to return the eject button to its rest position reliably. The loop shape can be configured in a variety of sizes that provide design flexibility. The loop shape enables the spring functionality to be placed at the periphery of the eject button, advantageously leaving other areas including the center of the eject button available for other functionality.
Additionally, many razors have spring members to provide pivot functionality. Many razors use coil springs or straight springs (e.g., a straight beam) to assist in the pivot functionality. These springs generally occupy a lot of volume and their short length does not allow for large deflections, bending, or long travel distances without exceeding the yield stresses of the spring. When pivoting about 12 or more degrees in either direction, if the spring length is shorter, the stress on the spring, and in particular at a location where it is fixed, can be large and the spring may permanently deform. The longer the spring or beam, as in the present invention, the more the amount of deflection can be distributed across the beam. Accordingly, the loop shape spring member of the present invention not only generally takes up a small volume or less critical volume than the coil or straight spring due to its length being formed into a circle, but also it provides enhanced beam bending due to its longer length and reduces fatigue on the spring. Further, as noted above, by having the spring form into a loop shape at a periphery of an assembly, extra space is provided for other functionality to be disposed therein including, but not limited to, a benefit delivery system, or other enhancements for a user.
The spring mechanisms of the present invention can be advantageous for a non-limiting embodiment of a razor which includes an interconnect member flanked by a cartridge and handle where the interconnect member can provide benefits to a consumer's skin. Such a skin interconnect member (reference 75 in
Having a pivoting skin interconnect member in an area very close to the razor cartridge presents numerous challenges which are mitigated with the spring member and mechanisms of the present invention. By having an interconnect member so close to the cartridge, an area typically devoted to providing ejection and pivoting functionalities, the location of one or both eject and pivoting mechanisms would necessarily be relocated, e.g., disposed further back on the handle. For instance, where current eject members, to force detachment of a razor cartridge, typically travel distances of about 1 mm to about 2 mm to detach a razor cartridge, a razor having a skin interconnect member which may be located from about 2.5 mm to about 8 mm away from the razor cartridge, typically about 3 mm away, would, to detach the cartridge, need to travel a distance from about 3 mm to about 10 mm of travel, typically about 5 mm. This long distance of travel requires a spring mechanism capable of adequately returning the moving member of the cartridge eject mechanisms to the rest position. The loop shaped spring member of the present invention achieves the long travel needed to maintain low stresses during use to avoid permanent deformation or fatigue failure while also providing such travel with low forces exerted by consumer.
The spring mechanism of the present invention is desirably disposed in an assembly or a member of a razor, preferably in a movable member in the assembly. The spring mechanism of the present invention is disposed within a movable member assembly.
A “movable member” or “movable member assembly” as used herein signifies a member on the razor comprising one or more movable portions capable of moving or providing a motion functionality for the razor. For instance, the movable member assembly of the present invention may preferably be a pivot mechanism (e.g., angular or rotational motion, side to side motion) or a release or ejection mechanism or a combination thereof.
The term “spring”, “spring mechanism”, or “spring member” as used herein, signifies any type of mechanical spring, such as a compression spring, a leaf spring, or any feasible spring or combination thereof.
The spring member of the present invention generally has a loop shape or a modified V-shaped loop spring as will be described below.
Any loop shaped spring member of the present invention, when straightened, desirably has an overall length of about 30 mm to about 90 mm and preferably about 65 mm.
The spring mechanism of the present invention is based on an interaction between a movable member in an assembly attached to the cartridge or handle of the razor and the spring member. During the pivot or eject functions, the spring member offers a resistance that is a function of its preload compression, its spring constant and the geometry of the bottom structure, and depending on the intensiveness of that resistance, the effect will be larger or smaller.
The term “loop” as used herein signifies a generally curved, circular shape, which may form a loop. Non-limiting loops of the present invention comprise oval, circle, elliptical, ring shape, modified V-shape, tear drop shape, or any modification or combination thereof. The loop may be split and the loop itself, the end portions or distal ends of the loop can be unconnected or free, unsupported, connected or mounted, or overlap each other. The distal ends can be facing towards each other or can be facing away from each other.
The loop of a loop spring member of the present invention desirably has radii of curvature ranging from about 1 mm to about 12 mm and more preferably about 7.5 mm. The loop diameter can be from about 10 mm to about 25 mm, preferably about 15 mm. Generally, the size of the loop spring member is such that it may fit on a person's fingertip.
The spring member of the present invention may also preferably include one or more retarding structures such as a knob or point. The terms “knob”, “protrusion”, “recess”, “notch”, “divot”, or “point” as used herein may signify any size structure of any geometrical shape, e.g., having a curved, rounded, or linear profile or any feasible combination thereof.
The term “angled” as used herein may signify a surface that has an angle or angles, is disposed at a slant or bent at an angle, which may or may not be linear.
The term “flat” or “flat areas” as used herein may signify a surface that is horizontally level, generally not slanted, even, or without marked projections or depressions.
The type of material chosen for the spring member is generally important for its ability to provide a flexible or elastic performance. In addition, the spring is desirably comprised of metal to provide a durable, long-lasting spring member. The spring member of the present invention is preferably comprised of stainless steel.
In one embodiment, the spring is comprised of any type of hard metal. In a preferred embodiment, the spring member is comprised of stainless steel. The stainless steel of the spring member of the present invention desirably has an engineering yield stress of about 800 MPa to about 2200 MPa, preferably between about 1000 MPa to 2080 MPa, and more preferably about 1000 MPa to about 1600 MPa. The type of material of the spring member of the present invention is a stainless steel defined by 301 Super Full Hard Temper. The engineering yield stress is determined by the ASTM standard E8 using a 0.2% off-set method. Preferably, the spring of the present invention is comprised of a flat wire as opposed to a slit strip to avoid slitting burr on the edges of the component.
Referring to
The spring member 10 has a thickness 98 of about 0.05 mm to about 0.25 mm, and preferably about 0.10 mm; a height 99 of about 1.0 mm to about 4.0 mm, and preferably about 1.7 mm; and a radius of curvature 79 along the loop of about 1 mm to about 12 mm, and preferably about 7.5 mm.
The overlapping portion 13 is desirably curved and generally encompasses approximately 90 degrees of a 360-degree circle, assuming the spring member to be effectively a full circle. The overlapping portion may alternately be larger or smaller. The overlapping portion 13, when straightened out, has a length of about 5 mm to about 40 mm, and preferably about 16 mm.
At least one knob is preferably disposed anywhere on the spring member of the present invention. As shown in
The knob 14, as shown, has a curved profile 14′. The knob 14 is also shown as having angled side portions 15a and 15b. The function of the knob is to assist in retarding or preventing spin or full movement of the spring member at the location of the knob as it sits within a razor bottom structure. This function will be described in more detail below.
As indicated in
In addition, an optimal length 26 for each angled side portion 15a and 15b ranges from about 0.5 mm to about 5 mm, and preferably about 1.0 mm. Angle A ranges from 80 degrees to 150 degrees and is preferably about 135 degrees. Any feasible length for the side portions is contemplated by the present invention. Angled side portions 15a and 15b are generally desirably symmetrical, though asymmetrical portions are also contemplated in the present invention.
A height 24 of the knob may preferably be determined from a bottom point 24a of the knob 14 (where the knob joins the circle loop of the spring member 10) to a highest point 24b of the curved profile 14′. The desired knob height 24 is in the range of about 0.5 mm to about 2.0 mm, and more preferably at about 0.9 mm.
The knob and the angled side portions may desirably each have one or more cutouts or apertures 78. While not required for the present invention, apertures may generally provide some advantages such as homogenizing the strength on the angled portions during the compression of the spring member, providing an extra locking or retention feature, and providing a guiding feature for manufacturing.
Other embodiments of spring members are contemplated in the present invention. For example, in
Spring member 30b has loop end portions 34a and 34b with distal ends 34a′ and 34b′ respectively. While the end portions 34a and 34b with distal ends 34a′ and 34b′ are not joined together, they do overlap. The overlapping portion 33 encompasses the area where the two end portions overlap. The overlapping portion 33 is desirably curved and generally encompasses an Angle B up to about approximately 180 degrees of a 360-degree circle, and preferably about 90 degrees assuming the spring member to be effectively a full circle. Alternatively, if feasible, the overlapping portion may be larger or smaller. The overlapping portion 33, when straightened out, desirably has a length of about 5 mm to about 30 mm, and preferably about 15.5 mm.
Spring members 30a and 30b of
As shown in
Turning to
The protrusion of the present invention may alternatively extend inwardly as shown in
It should be noted that spring member 50a has a similar arrangement of end portions and distal ends as the spring member 10 of
In an alternate embodiment shown in
Though not shown as having a knob or notch, these spring member embodiments may also include one or more of these elements.
Thus, it is noted that the spring member of the present invention can be a loop shape with or without a protrusion, knob, or notch, and with or without overlapping end portions or distal ends such that the end portions or distal ends are not joined.
The spring member of the present invention, including a knob extending outwardly (such as the spring member 10 of
The spring member is desirably incorporated into at least one portion of the movable member assembly 72, such as movable member assembly 72a or movable member assembly 72b.
The movable member assembly 72 of the razor 70 may preferably be comprised of a release or ejection mechanism, a pivot mechanism, or both mechanisms. The ejection mechanism may release or eject a cartridge from a razor handle. The pivot mechanism may provide a rotational or side-to-side motion of the cartridge relative to the handle. Details of the operation of the spring member assisting in the eject functionality (e.g., eject button) or pivot functionality (e.g., pivot member) will be described below.
Turning first to
The eject button is pushed forward with a force from a rest position to a fully extended position. In the ejection mechanism of the present invention, the force is preferably the linear movement forward or the force required to push the eject button generally forward (e.g., typically with a user's finger). The linear movement path forward has the effect of pushing the upper portion 82 into the rear of the cartridge 71 thereby removing or separating the cartridge 71 from the handle 73. In the fully extended position, the cartridge 71 will be released from the handle 73. At this point, the total force F of the eject button 72a (e.g., upper portion 82) will be about 2.5 Newtons. The button will have traveled a distance forward (toward the rear of the cartridge) of about 5 mm.
A nose is disposed on a portion of the movable member assembly. The nose may be a distance from about 3 mm to about 9 mm from a razor cartridge. In a non-limiting embodiment, a nose 81 can be disposed on the upper portion 82 as shown in
In a further non-limiting embodiment, nose 81 has a bevel 81a. Bevel 81a can be disposed at a distal end of the nose 81. The bevel can provide clearance for a pivotal movement of the type described herein for a razor cartridge 71 to the handle. The bevel can be angled upwards under the nose.
In
The bottom views of the travel path of the movable member assembly 72a are shown as well in
At stage (A), the retaining features 85a and 85b of the upper portion are disposed at one end of the respective slots 86a and 86b, respectively. Preferably, each feature is disposed at a first wall 87a of the slots. At stage (B), as the upper portion 82 travels forward relative to the lower portion 84, the retaining features 85a and 85b are disposed in a central or middle section of the slots 86a and 86b, respectively. Further, at stage (C) as the upper portion 82 travels forward to its fully extended position, the retaining features 85a and 85b are disposed at the other end of the slots 86a and 86b, respectively where they cannot move any further as the slot wall 87b of each slot blocks further movement in the eject direction.
In one embodiment, the retaining features 85a and 85b comprise a hook like or undercut structure or may have any shape that assists in providing the retaining function. In one embodiment, the hook portion may protrude out from the underside of the upper portion and face towards an outer wall 89 of the movable member assembly. The term “undercut” or “undercut structure” signifies a feature having a shape, which when utilized in the practice of molding a part (e.g., injection molding a plastic part), results in some interference with the mold (e.g., shape of part will not allow it to readily separate or fall free); for instance, upon the opening or removal of the mold after formation of the part.
While the retaining features 85a and 85b are described as disposed on the upper portion 82 and the slots 86a and 86b are described as disposed on the lower portion 84, these features and slots can be arranged in an alternative embodiment of the present invention where the features and slots are swapped, such that the retaining features are disposed on the lower portion and the slots are disposed on the upper portion. The present invention contemplates any feasible arrangement to provide retention along a travel path for the movable member assembly.
Turning to
Spring member 92 has a knob 92a and the track 94 or the underside 91 of the upper portion comprises one or more mounting structures 95 with a shape to accommodate the knob 92a. The shape of at least one of the structures 95 is desirably substantially curved or circular such that the curved profile of the retarding structure knob 92a can be disposed flush around a curved portion of the outer surface of the structure 95 as shown in
Loop spring member 92 may or may not be permanently attached to the upper portion 82, the lower portion 84, or any other portion of the movable member assembly. Preferably, the spring member is not permanently secured, mounted or attached to any portion of the assembly such that it is lies on or within but is generally capable of moving within the circular track 94. For instance, if a portion containing the spring member were tipped upside down, the spring member 92 may desirably be loose or fall out of the lower portion relatively easily or be able to be lifted out of the track with one's fingers.
It should be noted that mounting structure 95 and the knob 92a of the spring member serve to retard or prevent the spring member 92 from spinning around and losing position within the track 94 which may negatively affect the functionality of the spring member 92. The mounting structure 95 is intended to keep the spring member in the same orientation throughout operation.
Turning to
The additional guide support structures 93 are desirably disposed proximal to the overlapping portion 97 of the end portions 96a and 96b and distal ends 96a′ and 96b′ respectively. In this way, the support structures 93 serve to keep the loop spring or its end portions from extending outward from the track or from losing shape or orientation.
As noted above, the spring member 92 is desirably not permanently fixed within lower portion as discussed above. The spring member 92 of the present invention is preferably in a preloaded, slightly compressed position at stage (A) of
Also contemplated in the present invention is a spring member 92 in any other feasible position in the rest state, (e.g., not in a preloaded, compressed position). The pre-loaded, tension arrangement provides a further advantage in that it assists in eliminating rattling or other noises that may be present in a fully assembled razor. With a spring member not under tension, the spring member may be moving around (e.g., due to the fact it is not permanently attached to the eject button portions). The overlapping portion 97 of the end portions 96a and 96b and distal ends 96a′ and 96b′ of the spring member 92 may be analogous any of the overlapping end portion arrangements described herein. The distal ends 96a′ and 96b′ are desirably not fixed to any structure in the movable member assembly, are generally unsupported, and can be free ends.
A spring member inside the eject button under a force F is shown at stage (B) and stage (C). At stage (B) the spring member 92 is initially compressed from its original rest state as a linear force F is applied. The end portions 96a and 96b and free distal ends 96a′ and 96b′ of the spring member 92 move down and around, along the outer and inner periphery of the spring member 92. In one embodiment, the overlapping end portion 96b that was initially disposed outside the periphery of the spring member 92 moves down along the outer periphery of the spring member 92 as shown in stage (B) at surface 91b of
At stage (C), as additional force F is applied, the button is in its fully extended position as described in conjunction with
A width or height 99 of the spring member 92 is also shown in
The direction of the force F is shown in
Additionally, in another embodiment, the present invention contemplates that the eject button assembly 72a can travel in a backwards direction from the rest position at stage (A). The eject button assembly may travel in a direction opposite the forward direction (e.g., the direction to release a cartridge) if the razor is accidentally dropped and the button assembly is unavoidably forcibly pushed rearward. Under a drop situation, the force may be about 20N in the drop direction and it may be about 10 N for a user to get back into the position of stage (A).
Turning to
In one embodiment, the stop 110 may provide a compression preload force which is about 0.25 Newtons to about 0.75 Newtons, and preferably about 0.32 Newtons while also preventing the button from traveling backwards. To travel backwards, the button can travel over the side of stop 110 with a steep slope and the force to overcome the stop is about 20 Newtons. This allows the button to move out of the way during accidental drops without causing damage. The side of the stop 110 with a gradual slope provides a low enough force of about 10 Newtons to allow the consumer to put the button back in the rest position. In this way, the button does not get stuck or damaged. It should be noted that while at stage (A), the spring member 92 is the same as described with respect to cartridge ejection, during the backwards movement of the assembly, the spring member 92 will become larger or elongate and the overlapping portion will be reduced as shown in
Turning to
Spring member 92 is shown disposed in the eject button assembly 72a. The tracks 94 may be disposed within an upper portion 82 and/or a lower portion 84 of the movable member assembly or the eject button 72. As shown, the spring member 92 is disposed within the upper portion 82 but contacts the lower portion 84 as well.
Turning to
As noted above, a spring member of the present invention may assist in the operation of the pivot functionality. The spring member may be disposed within a pivot member which can have one or more movable members. The pivot functionality may pivot the razor cartridge relative to the handle along a number of axes in the pitch, yaw or roll motions. A razor contemplated in the present invention is described in co-owned, co-pending US Docket Nos. 15139P, 15155P, 15156P, 15159P, 15177PQ, 15178PQ, 15179P, and 15180PQ, which are hereby incorporated herein by reference.
An exemplary second movable member assembly 72b of the present invention is shown in
The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm.”
Every document cited herein, including any cross referenced or related patent or application is hereby incorporated herein by reference in its entirety unless expressly excluded or otherwise limited. The citation of any document is not an admission that it is prior art with respect to any invention disclosed or claimed herein or that it alone, or in any combination with any other reference or references, teaches, suggests or discloses any such invention. Further, to the extent that any meaning or definition of a term in this document conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this document shall govern.
While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
| Number | Date | Country | |
|---|---|---|---|
| 62650290 | Mar 2018 | US |
