A HANDLE WITH CONCAVE/CONVEX PROFILE

Abstract: A handle for or of a hand held device which has on a side thereof a concave convex profile to accommodate the pad and base (or heel) of the thumb, opposite which side the handle is sufficiently bulbous to provide a surface against which all of the first three fingers of the user engage. This anthropometric handle provides the user or holder thereof with improved feel and purchase.

Description: A HANDLE WITH CONCAVE/CONVEX PROFILE This invention relates to hand held devices, and specifically relates to handles for such devices, and devices including such devices. It is known to provide handles of tooth brushes with a certain degree of shaping to enable them to be comfortably and firmly held, but generally such handles are elongated rods, and do not provide the comfort and grip which might be expected, because when the fingers are wrapped round the rod handle, there is only limited contact between the rod and the fingers, and control and comfort are compromised. The present invention seeks to provide a handle of or for hand held devices, including toothbrushes, which is configured to provide enhanced comfort and firmness to the user. According to the invention there is provided a handle for or of a hand held device, wherein the handle has on a side thereof a concave convex profile to accommodate the pad and base (or heel) of the thumb, opposite which side the handle is sufficiently bulbous to provide a surface against which all of the first three fingers of the user engage. The handle is preferably moulded in plastics material, and can be used for or as part of any of a large variety of hand held devices, including tooth and other brushes, working tools such as screwdrivers, chisels, ratchet tools, and hand held articles in general. An embodiment of the invention will now be described by way of example with reference to the accompanying drawings, wherein; Fig. 1 is a side view of the handle of the present invention; Figs 2, 3, 4 and 5 are sectional views taken along the lines A-A, B-B, C-C and D-D, respectively; Fig. 6 is a perspective view of the handle of Fig. 1 when positioned in a hand, but before the fingers have moved to the holding position; and Fig. 7 is a view similar to Fig. 6, but showing the fingers clasped around the handle. Referring to the drawings, the handle is shown in Fig. 1 , and is indicated by the numeral 10. It is a solid body formed typically of plastics by moulding and it has a varying cross sectional shape as shown in Figs. 2 to 5. Proceeding from the left hand end in Fig. 1 and referring to Figs. 2 to 5, from a nose 12, the body has a circular cross section at sections A-A and B-B, and until the region 14 where at the top side of the handle, the profile enters a concave region 16. Sections C-C and D-D show how this concave profile affects the shape of the handle. The top side of the handle 10 has a concave (region 16) convex (region 20) profile at the top side thereof, and the remainder of the handle is bulbous, in this example of circular cross section. This concave convex profile matches the inner profile of the thumb and therefore this side of the handle is an anthropometric match for the thumb. Thus as shown in Fig. 6, the handle seats in a comfortable and firm fashion against the thumb when the handle is positioned in the user's hand. Fig. 6 shows the handle positioned before the fingers are clasped around it, and Fig. 7 shows the handle when fully grasped. It can be seen from Fig. 7 that the handle is sufficiently bulbous that all of the first three fingers grasp the handle, enhancing the grip and comfort of the handle. The handle is symmetric about a longitudinal axis and therefore can be used equally in the right or left hand.

Claims: CLAIMS: 1. A handle for or of a hand held device, characterised in that the handle has on a side thereof a concave convex profile to accommodate the pad and base (or heel) of the thumb, opposite which side the handle is sufficiently bulbous to provide a surface against which all of the first three fingers of the user engage. 2. A handle according to claim 1 characterised in that the handle is moulded in plastics material. 3. A handle according to any of the preceding claims characterised in that said handle forms part of a toothbrush. 4. A handle according to either of claims 1 or 2 characterised in that said handle is used for or forms part of a screwdriver. 4. A handle according to either of claims 1 or 2 characterised in that said handle is used for or forms part of a chisel. 4. A handle according to either of claims 1 or 2 characterised in that said handle is used for or forms part of a ratchet tool.

Inventors: SINCLAIR BARRY, SINCLAIR, BARRY
Applicants: OPTIDENT INTERNATIONAL LTD, SINCLAIR BARRY, OPTIDENT INTERNATIONAL LTD., SINCLAIR, BARRY
Application year: 1998
Main classification: B25G1
IPC codes: A46B5, B25G1