Patent Application
20100313426
The present invention relates to safety razors including a handle having a grip portion and a connection portion with a blade unit mounted to the connection portion by a connection member. More particularly, the present invention relates to safety razors including a handle having a grip portion and a connection portion secured to the grip portion where the connection portion rotates with respect to the grip portion about a rotational axis. A blade unit is mounted to the connection portion by a connection member and the blade unit pivots with respect to the connection member about a pivot axis.
Safety razors today have a blade unit connected to a handle for a pivotal movement about a single pivotal axis which is substantially parallel to the blade (i.e., the blade edge). The pivotal movement about the single axis provides some degree of conformance with the skin allowing the blade unit to easily follow the skin contours of a user during shaving. The pivot axis, which usually extends parallel to the cutting edges of the blades, can be defined by a pivot structure where the handle is connected to the blade unit. Such safety razors have been successfully marketed for many years. However, the blade unit often disengages from the skin during shaving as it has limited mobility able to pivot about only a single axis.
To address this problem, it has been suggested that the safety razors be provided with blade units that can additionally pivot about another axis which is substantially perpendicular to the blade(s). Such safety razors do provide improved conformance of the blade unit to the contours of the face during shaving.
While these safety razors which provide a blade unit that pivots about two axes help the blade unit to more suitably follow the contours of the face during shaving, they do not follow all the contours of the body during shaving.
It has been found that by providing a safety razor having both pivotal and rotational movement the blade unit can closely follow all the contours of the body during shaving.
Thus, there is a need for a safety razor having a blade unit capable of a pivotal movement about a pivot axis and rotational movement about a rotational axis to provide a safety razor which can closely follow all the contours of the body during shaving.
Provided in accordance with the present invention is a safety razor comprising a handle, the handle comprising a grip portion and a connection portion secured to the grip portion, the connection portion rotating with respect to the grip portion about a rotational axis; a blade unit is mounted to the connection portion by a connection member, the blade unit comprises a guard, a cap, at least one blade positioned between the guard and the cap and a transverse centerline extending through the guard and the cap in a direction substantially perpendicular to the at least one blade, the blade unit pivoting with respect to the connection member about a pivot axis substantially parallel to the at least one blade.
The rotational axis may intersect the transverse centerline. The grip portion of the handle may comprise a bore and the connection portion may comprise a rod wherein the bore of the grip portion receives the rod of the connection portion. The rod may comprise a pin extending radially outward from the rod.
The razor may comprise a return force generating member connecting the pin with the grip portion. The return force generating member may comprise an elastomeric member.
The grip portion may comprise a longitudinal centerline and the bore is positioned at an angle with respect to the grip portion longitudinal centerline.
The blade unit may be releasably mounted to the connection portion by the connection member.
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 taken in conjunction with the accompanying drawings.
Referring to
Blade unit 11 comprises a guard 22 at the front of the blade unit 11, a cap 24 at the rear of the blade unit 11 and at least one elongated blade 26 positioned between the guard 22 and the cap 24. Although five blades 26 are shown it is understood that more or less blades 26 may be mounted within the blade unit 11. The blades 26 are shown secured within the blade unit 11 with clips 28, but other assembly method known to those skilled in the art may also be used. The guard 22 may have a plurality of fins 30 spaced apart from each other that extend longitudinally along a length of the blade unit 11. The cap 24 may have a lubricating strip 27.
The blade unit 11 has a transverse centerline 30 extending through the guard 22 and the cap 24 in a direction substantially perpendicular to the at least one blade 26. The transverse centerline 30 divides the blade unit 11 into substantially equal right half 32 and left half 34. The blade unit 11 pivots with respect to the connection member 16 about a pivot axis 36 that extends substantially parallel to the at least one blade 26.
The pivot axis 36 is preferably in front of the blades 26 and below a plane tangential to the guard 22 and cap 24, although other pivot positions are possible. The blade unit 11 may have a pivot range up to about 45° about pivot axis 36. Other pivot ranges both larger and smaller may be used if desired.
The rotational axis 18 preferably intersects the transverse centerline 30. This intersection aligns the blade unit 11 with the handle 12 to provide a balanced safety razor 10. The intersection allows the right half 32 and left half 34 to rotate equally from one side to the other about handle 12. The connection portion 16 and accordingly the blade unit 11 may have a rotation range up to about 30° about rotational axis 18, e.g., about 15° in one direction and about 15° in the opposite direction.
The rotational axis 18 and the pivot axis 36 may intersect one another. Alternatively, the rotational axis 18 may be spaced from the pivot axis 36, at their closest measured distance, by a distance of less about 10 mm, preferably less than about 5 mm. The closer the rotational axis 18 is to the pivot axis 36 the user has more control over the movement of the blade unit 11 during shaving.
Referring now to
Referring now to
Referring now to
Opening 46 in top surface 13 is larger than opening 47 in bottom surface 15 (shown in
Opening 46 can take on any shape to hold or house the return force generating member 50. Since the return force generating member 50 is held in the opening 46 which is formed on the surface of grip portion 14, the safety razor can be produced by a simplified manufacturing process.
The holding structure 51 of the return force generating member 50 can take any shape or structure which can receive the relative movement transmitted from the connection portion 16. As shown in
The elastic members 52 of the return force generating member 50 are formed of an elastomeric material. Such an elastomeric material may include synthetic or natural rubber materials. One example of such an elastomeric material is a polyether-based thermoplastic elastomer (TPE) which is available from Kriburg HTP under Code No. 1028/55. Another example of such an elastomeric material for use herein is a polyether-based thermoplastic vulcanized elastomer (TPV's) which is available from Exxon Mobil Corporation under Code No. Santoprene™ 101-55/201-55.
The return force generating member 50 may be formed of a single material. Specifically, all the component members of the return force generating member 50 (i.e., holding structure 51, elastic members 52 and outer supports 53) are formed by an identical material.
The return force generating member 50 may be a layered structure formed by two or more different elastomeric materials. Herein, “different elastomeric materials” refers to two or more materials which have different elastic characteristics (e.g., elasticity). The different elastomeric materials do not have to be formed by two or materials but may be formed by an identical elastomeric material by selecting different physical parameters on each layer (e.g., thickness, density, etc.).
As shown in
The stepped features of return force generating member 50 also aid in retaining return force generating member in place within handle 12. Other configurations may also be employed to aid in retaining return force generating member in place within handle 12.
The return force generating member 50 may also be integral with the elastomer 17 of the grip portion 14.
The grip portion 14 comprises a longitudinal centerline 70. The bore 40 in the grip portion 14 may be positioned at an angle α with respect to the grip portion longitudinal centerline 70. The angle α may be from about 5° to about 30°. Alternatively, the bore 40 in the grip portion 14 may be aligned with the grip portion longitudinal centerline 70 (not shown).
In
In
The return force generated by the return force generating member 50 can be either linear or non-linear acting to return the connection portion 16 back to the rest position. The torque range can be from about 0 Nmm to about 15 Nmm as the connection portion 16 rotates from a rest position about the rotation axis 18 in either direction. Other torque ranges both larger and small may be used as desired. The torque can be varied depending on the elastic property of the return force generating member used.
The safety razor may include a locking feature allowing the user to lock the connection portion 16 in place in the rest position. In addition, the safety razor may include a locking feature allowing the user to lock the connection portion 16 in positions other than the rest position.
As the safety razor allows the blade unit to pivot about pivot axis and the connection portion to rotate about the rotation axis the blade unit can optimally conform to the contours of the body during shaving.
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.”
All documents cited in the Detailed Description of the Invention are, in relevant part, incorporated herein by reference; the citation of any document is not to be construed as an admission that it is prior art with respect to the present invention. 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 | |
|---|---|---|---|
| 61186408 | Jun 2009 | US |
