Abstract:
A hand held utensil having a head portion connected to a handle, wherein the handle includes structure for encouraging a user of the utensil to present the head portion to an article at a preferred angle.

Description:
This invention is in the field of utensils incorporating handles for hand held use. Particular examples of such utensils include knives, blades, razors, scrapers, and the like. 
     BACKGROUND OF THE INVENTION 
     When using a hand held utensil, the user frequently applies a typical action which consists of an approach movement, impact and a follow through. This action, which may be referred to as a swing action, is largely controlled by the thumb and occurs on a plain perpendicular to the long axis of the users forearm. The position of the thumb is important in co-ordinating an appropriate swing. 
     SUMMARY OF THE INVENTION 
     In the present invention it has been found that the position of a thumb, and on occasion other digits such as the user&#39;s index finger, may in fact be appropriately altered during the swing action. That is, when using certain utensils the position of the thumb may preferably be in a first position in the approach and/or impact stages of the action and in a second position during the impact and/or follow through. More typically, such utensils may be used in different ways such that they are presented to a second article, such as a person&#39;s face in respect of a razor, at different angles or orientations. To maximise the ease and comfort in which a utensil is applied to the article, the grip on the utensil may be altered depending upon the angle or orientation at which it is presented. It is recognised in the present invention that it is desirable to provide a handle on a utensil which facilitates or encourages a user to adopt an appropriate grip of the utensil which is dependant on the angle of presentation of the utensil and which does so in a manner that is apparently automatic or subconscious to the user. 
     Hand held utensils typically comprise a tool portion and a handle portion. Often the tool portion forms the head of the utensil. It is known that in respect of many utensils the angle at which the tool or head of the utensil is applied or presented is influential on the effectiveness of the function of the tool. For example, the angle of orientation of the bristles of a tooth brush relative to the teeth and gum is very important. When the bristles are addressed to the teeth orthogonally there is a much greater possibility that the bristles will bridge over the gaps between the teeth and those gaps or inter-proximal areas will not be properly cleaned. On the other hand, by tilting the bristles in the direction of the gum or roots of the teeth the bristles are far more likely to access these inter-proximal areas. 
     In another example attempts have been made to offer flexibility in the angle of presentation of the head of a razor. Some razors have been designed with pivotal heads, although generally the degree of pivot has been relatively small and unidirectional. 
     An object of the present invention is to provide a means integral with a utensil&#39;s handle which increases the comfort of use of that utensil, notwithstanding the angle at which the utensil is presented and notwithstanding the stage of the action or motion in which the utensil is used at any particular instant. The invention particularly attempts to negate awkward wrist or arm actions associated with the use of hand held utensils. 
     According to a first aspect of the present invention there is provided a hand held utensil having a tool or head portion and a handle, characterised in that the handle includes means for encouraging a user of the utensil to present the head or tool portion to an article at a preferable angle or tilt. 
     The handle includes means for encouraging a user of the utensil to change his or her hold on the handle when moving from presenting the utensil to an article at one angle or orientation to presenting the utensil to the article in an alternative angle or orientation. 
     Preferably the means includes the positioning or attachment of the handle at an off-set or tilted angle from the head or tool portion. 
     The means also preferably includes a grip on or integral with the handle which encourages the user to change his or her hold on the handle when appropriate for reasons of improving the effectiveness or comfort in use of the utensil as a consequence of the angle at which the utensil is presented to the article. 
     The grip may advantageously be a moulded thumb rest which spirals from a first position substantially central to the longitudinal axis of the handle to a second position substantially outside the longitudinal axis of the handle, the spiral being formed in the direction of off-set of the head or tool portion as it approaches the head of the utensil. 
     The head or tool portion and spiral thumb grip would tilt to the right when viewed in plan view for a right-handed user, and tilt to the left for use by a left-handed user. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING FIGURES 
     An example embodiment will now be described with reference to the accompanying figures in which; 
     FIG. 1 shows a plan view of the toothbrush incorporating the invention; 
     FIG. 2 shows a side elevation of the toothbrush embodiment shown in FIG. 1; 
     FIG. 3 shows an end view of the embodiment shown in FIGS. 1 and 2 above; and 
     FIG. 4 illustrates a side elevation of a razor. 
    
    
     In FIGS. 1 to  3  there is shown a toothbrush comprising a head  1 , neck  2  and handle  3 . The head  1  incorporates a plurality of bristles  4 . 
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The shape of the handle  3  is important to the invention. In the embodiment shown the handle is of substantially rectangular cross section having two relatively long faces, these being an upper  5  and lower  6  face, and two relatively short faces or edges, these being left  7  and right  8  faces. 
     The handle  3  is attached to the head  1  via the neck  2  at an offset angle of approximately 15 degrees. That is, the bristles  4  which extend from the head  1  extend in a direction 15 degrees from the vertical when the lower face  6  of the handle is resting substantially flat on a horizontal surface. 
     The embodiment shown in FIGS. 1 to  3  is intended for use by a right handed person and thus it is appropriate for the bristles to be offset in a direction toward the right of the vertical, as shown. The relative tilt of the bristles to the handle means that when a user holds the handle conventionally the bristles are encouraged to address or be presented to at least the upper left molars and premolars and lower right molars and premolars at a preferable angle facilitating the edges of the bristles accessing or better accessing the interproximal spaces between the teeth in these areas. 
     The handle  3  further comprises a thumb grip  9  which is formed in the shape of a spiral groove, the groove  20  being substantially continuous with a concave longitudinal groove running along the upper face  5  of the handle  3 . In use it is a simple and relatively automatic movement for the thumb to slide from the continuous longitudinal groove  20  on the upper face  5  of the handle  3  along towards the outer most point on the spiral portion of the groove  20 . However, by doing this the angle or orientation of the brush as it is comfortably held is altered. Advantageously, with the thumb in this altered position towards the extremity of the spiral groove  20  the bristles may be presented at a preferable angle or tilt to the lower left molars and premolars and the upper right molars and premolars. 
     The feature of providing the extremity of the spiral groove  20  offset from the central longitudinal axis of the handle  3  is advantageous in that it provides further leverage to the user when brushing these latter mentioned areas of his or her teeth. 
     It may be seen from the embodiment described that the invention allows desirable bristles and bristle formation to be employed. It does not require the use of longer outside bristles which are prone to deformation. 
     Turning to FIG. 4 there is demonstrated an alternative utensil to which the invention is applied. A razor, generally referenced  10 , includes a head or tool portion  11  and a handle  12 . The head  11  is connected to the handle  12  by a neck  13  which orients the head  11  at an angle off-set from the longitudinal axis of the handle  12 . 
     The handle  12  also includes a rest  14  which, in the example embodiment shown in FIG. 4, is suitably moulded to receive a user&#39;s thumb and or index finger. As the rest  14  extends laterally from the axis of the handle  12  it may serve to provide leverage in use, enabling an enhanced control of the utensil, and particularly the head  11 , in directions other than that which is axial to the longitudinal axis of the handle. 
     The particular digit of a user&#39;s hand used to operate the lever function of the handle may vary in accordance with the angle at which the razor  10  is presented to the user&#39;s face or body. It has also been found in the invention that the handle provides for, a comfortable grip by the user such that the function of the rest  14  and the handle  12  are interchanged, causing the end  12   a  of the handle  12  to afford a lever function. 
     Similar designs may be employed in relation to a large number of utensils including those which have been aforementioned herein, paintbrushes, screwdrivers and other mechanical tools and so on. 
     Other modifications and improvements may be incorporated without departing from the scope of the invention hereintended.