ERGONOMIC DUAL MODE SNIPS

Abstract

Ergonomic snips have a pair of pivoted levers each having a forward end formed as a cutting blade and a rearward end forming a hand portion. A first handgrip on one hand portion includes a first anti-slip ear suitable for engaging a user's thumb. A second handgrip on the other hand portion includes a second anti-slip ear to form a finger receiving portion to accommodate one or both of the index and middle fingers of a user to allow a user to either place the second anti-slip ear between the user's index and middle fingers to maximize torque or place the second anti-slip ear between said middle and ring fingers to provide greater cutting control or precision. The distances between a user's thumb and the user's index and middle fingers remain substantially the same in both positions of the hand.

Claims

1-20. (canceled)

21-33. (canceled)

34. Ergonomic snips comprising: (A) first and second elongate levers, said levers having leading ends and having trailing ends forming respective first and second hand gripping portions; (B) first pivoting means for pivotally connecting said first and second levers at said leading ends; (C) first and second elongate blade levers each having a distal end formed as a cutting blade and a proximate actuating end; (D) second pivoting means for pivotally connecting said first and second blade levers to each other at a point intermediate said distal and proximate ends, a line extending through said first and second pivoting means defining an axis of the snips; (E) third pivoting means for pivotally connecting said proximate end of said first blade lever to said second lever and pivotally connecting said proximate end of said second blade lever to said first lever; (F) a first handgrip covering said hand gripping portion of said first lever and including a first anti-slip ear generally extending in a direction away from said axis for engaging a user's thumb; and (G) a second handgrip covering said hand gripping portion of said second lever and including a second anti-slip ear extending in a direction away from said axis to form a finger gripping portion at an intermediate location of said second hand gripping portion and also formed with an outwardly projecting protrusion at a distal end of said second handgrip covering, said second ear and said protrusion being spaced from each other along said second hand gripping portion to form an elongate finger receiving portion having a predetermined length along said axis, said first anti-slip ear on said first handgrip covering being positioned along said axis to be axially aligned with a point substantially midway relative to said predetermined length of said finger receiving portion when taken along a direction normal to said axis, whereby said first and second anti-slip ears enable a user, with the user's thumb against said first anti-slip ear, to either place said second anti-slip ear between the user's index and middle fingers in a first position of the hand to maximize torque on said hand gripping portions or place said second anti-slip ear between said middle and ring fingers in a second position of the hand to provide greater control or precision of cutting by said cutting blades while the distances between the user's thumb and the user's index and middle fingers remain substantially the same in both said first and second positions of the hand.

35. An ergonomic snip as defined in claim 34, wherein the axial dimension between said first pivoting means and a remote end of said finger receiving portion is “a”, an axial dimension between said first pivoting means and said second anti-slip ear or projection is “b”, a transverse dimension along a direction normal to said axis at the forward-most portion of said first anti-slip ear or projection and said finger-receiving region is “c” and the transverse dimension along a direction normal to said axis at the rear-most portion of said first anti-slip ear or projection and said finger-receiving region is “d”, and a d.

36. An ergonomic snip as defined in claim 35, wherein b≈2d.

37. An ergonomic snip as defined in claim 35, wherein d>c.

38. An ergonomic snip as defined in claim 35, wherein (b−a) is within the range of 39-45 mm.

39. An ergonomic snip as defined in claim 34, wherein said first anti-slip ear is spaced axially forwardly of said second anti-slip ear a distance approximately equal to 28% of said predetermined length.

40. An ergonomic snip as defined in claim 34, wherein a proximate thumb engaging surface of said first anti-slip ear or projection is arranged to be substantially axially aligned with a position on said finger receiving portion that is approximately 28% of said predetermined distance from said second anti-slip ear.

41. Ergonomic snips comprising: (A) first and second elongate levers, said levers having leading ends and having trailing ends forming respective first and second hand gripping portions; (B) first pivoting means for pivotally connecting said first and second levers at said leading ends; (C) first and second elongate blade levers each having a distal end formed as a cutting blade and a proximate actuating end; (D) second pivoting means for pivotally connecting said first and second blade levers to each other at a point intermediate said distal and proximate ends, a line extending through said first and second pivoting means defining an axis of the snips; (E) third pivoting means for pivotally connecting said proximate end of said first blade lever to said second lever and pivotally connecting said proximate end of said second blade lever to said first lever; (F) a first handgrip covering said hand gripping portion of said first lever and including a first anti-slip ear or protrusion generally extending in a direction away from said axis for engaging a user's thumb; and (G) a second handgrip covering said hand gripping portion of said second lever and including a second anti-slip ear or protrusion extending in a direction away from said axis to form a finger gripping portion at an intermediate location of said second hand gripping portion and also formed with an outwardly projecting protrusion at a distal end of said second handgrip covering, said second ear and said protrusion being spaced from each other along said second hand gripping portion to form an elongate finger receiving portion having a predetermined length along said axis within a range of 39-45 mm, said first anti-slip ear on said first handgrip covering being positioned along said axis to be axially aligned with a point substantially midway relative to said predetermined length of said finger receiving portion when taken along a direction normal to said axis, whereby said first and second anti-slip ears enable a user, with the user's thumb against said first anti-slip ear, to either place said second anti-slip ear between the user's index and middle fingers in a first position of the hand to maximize torque on said hand gripping portions or place said second anti-slip ear between said middle and ring fingers in a second position of the hand to provide greater control or precision of cutting by said cutting blades while the distances between the user's thumb and the user's index and middle fingers remain substantially the same in both said first and second positions of the hand.

42. An ergonomic snip as defined in claim 41, wherein an axial dimension between said first pivoting means and a remote end of said finger receiving portion is “a”, an axial dimension between said first pivoting means and said second anti-slip ear or projection is “b”, a transverse dimension along a direction normal to said axis at the forward-most portion of said first anti-slip ear or projection and said finger-receiving region is “c” and the transverse dimension along a direction normal to said axis at the rear-most portion of said first anti-slip ear or projection and said finger-receiving region is “d”, and a d.

43. An ergonomic snip as defined in claim 42, wherein b≈2d.

44. An ergonomic snip as defined in claim 42, wherein d>c.

45. An ergonomic snip as defined in claim 41, wherein said first anti-slip ear is spaced axially forwardly of said second anti-slip ear a distance approximately equal to 28% of said predetermined length.

46. An ergonomic snip as defined in claim 41, wherein a proximate thumb engaging surface of said first anti-slip ear or projection is arranged to be substantially axially aligned with a position on said finger receiving portion that is approximately 28% of said predetermined distance from said second anti-slip ear.

47. Ergonomic snips comprising: (A) first and second elongate levers, said levers having leading ends and having trailing ends forming respective first and second hand gripping portions; (B) first pivoting means for pivotally connecting said first and second levers at said leading ends; (C) first and second elongate blade levers each having a distal end formed as a cutting blade and a proximate actuating end; (D) second pivoting means for pivotally connecting said first and second blade levers to each other at a point intermediate said distal and proximate ends, a line extending through said first and second pivoting means defining an axis of the snips; (E) third pivoting means for pivotally connecting said proximate end of said first blade lever to said second lever and pivotally connecting said proximate end of said second blade lever to said first lever; (F) a first handgrip covering said hand gripping portion of said first lever and including a first anti-slip ear generally extending in a direction away from said axis for engaging a user's thumb; and (G) a second handgrip covering said hand gripping portion of said second lever and including a second anti-slip ear extending in a direction away from said axis to form a finger gripping portion at an intermediate location of said second hand gripping portion and also formed with an outwardly projecting protrusion at a distal end of said second handgrip covering, said second ear and said protrusion being spaced from each other along said second hand gripping portion to form an elongate finger receiving portion having a predetermined length along said axis, said first anti-slip ear on said first handgrip covering being positioned along said axis to be axially aligned with said predetermined length of said finger receiving portion when taken along a direction normal to said axis, whereby said first and second anti-slip ears enable a user, with the user's thumb against said first anti-slip ear, to either place said second anti-slip ear between the user's index and middle fingers in a first position of the hand to maximize torque on said hand gripping portions or place said second anti-slip ear between said middle and ring fingers in a second position of the hand to provide greater control or precision of cutting by said cutting blades while the distances between the user's thumb and the user's index and middle fingers remain substantially the same in both said first and second positions of the hand, wherein a proximate thumb engaging surface of said first anti-slip ear or projection is arranged to be substantially axially aligned with a position on said finger receiving portion that is approximately 28% of said predetermined distance from said second anti-slip ear.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above and other aspects, features and advantages of the present invention will be more apparent from the following description when taken in conjunction with the accompanying drawings, in which:

[0012] FIG. 1 is a side elevational view of a compound or multiplied leverage snips in accordance with the invention, shown in the condition when the cutting jaws or blades are closed;

[0013] FIG. 2 shows a first mode of use of the snips shown in FIG. 1 in which a user's hand is placed in a first position to provide maximum cutting torque or power while somewhat sacrificing some control and cutting precision; and

[0014] FIG. 3 is similar to FIG. 2 but shows a second mode of use of the snips wherein the user's hand has moved to an alternate or second position providing the user with less cutting torque but increased control for precision cutting.

DETAILED DESCRIPTION

[0015] Referring now specifically to the figures, in which the identical or similar parts are designated by the same reference numerals throughout, and first referring to FIG. 1, a pair of snips in accordance with the present invention is generally designated by the reference 10.

[0016] The snips 10 includes a pair of pivoted levers 12, 14 that generally define an axis of symmetry A. Each lever 12, 14 has a forward or leading pivoted end 12a, 14a and rearward or trailing ends 12b, 14b forming hand portions. The levers at 12, 14 are pivoted to each other at the forward or leading ends by pivot 16.

[0017] A pair of complementary elongated blade levers 18, 20 each have opposing cutting blade ends 18a, 20a and actuating ends 18b, 20b. The elongated blade levers 18, 20 are pivoted to each other at intermediate ends thereof at pivot 22. Third pivots 24, 26 pivot the actuating ends 18b, 20b to associated handle levers 12, 14.

[0018] A first handgrip 28 at least partially covers the rearward or trailing end 14b of the lever 14. The handgrip 28 may be formed of any conventional materials used for handgrips for such tools, including plastics, foam materials etc. The handgrip 28 includes a first anti-slip ear or projection 30 proximate to pivot 26 and generally extends in a direction away from the axis A to form an anti-slip catch suitable for engaging a user's thumb 42 as shown in FIG. 2. In the embodiment shown in FIG. 1, the anti-slip ear or projection 30 is inclined rearwardly as shown and forms an angle θ, no greater than 90 degrees, with respect to a generally axial direction parallel to the axis A.

[0019] The second handgrip 32 at least partially covers the rearward or trailing end 14b of the lever 14. The second handgrip 32 includes a second anti-slip ear or projection 34 that extends in a direction generally away from the axis A and forms a finger receiving portion 36 between the second anti-slip ear or projection 34 and an outwardly projecting protrusion 38 at the forward-most end of the second handgrip 32. The finger receiving portion 36 has a generally axial length along the lever 14 to accommodate one or both of the index and middle fingers, 44, 46, respectively, of a user to allow a user to either place the anti-slip ear or projection 34 between the user's index and middle fingers 44, 46, respectively, in a first position of the hand as shown in FIG. 2 to maximize torque on the hand portions of the levers. Clearly, the further rearward that the hand is placed relative to the pivot 16 the greater the leverage and force that can be applied to the cutting or shear blades 18a, 20a.

[0020] Referring to FIG. 3, the hand can be advanced relative to the second anti-slip ear or projection 34 to bring the hand closer to the pivot 16. This reduces the lever arms and, therefore, reduces the amount of torque or cutting force that can be applied to the cutting blades. However, in this second position or mode of use of the snips, a user can achieve greater control and cutting precision.

[0021] A feature of the invention is that the configuration of the levers and the positions of the anti-slip ears or projections 30, 34 are selected so that the distances between a user's thumb, which stays in a fixed position in both modes of operation, and the user's index and middle fingers remain substantially the same in both the first and second positions of the hand. In this way, the snips ergonomically allows a user to use the snip with substantially equal comfort in both of the operating modes or hand positions while allowing a user to either apply greater cutting force or less cutting force but greater control to cut with greater precision.

[0022] Referring to FIG. 1, the axial dimension between the first pivot 16 and the forward-most end of the second handgrip is “a”, the axial dimension between the first pivot 16 and the second anti-slip ear or projection is “b”. The transverse dimension along a direction substantially normal to the axis A through the forward-most portion of the first anti-slip ear or projection 30 is “c”. The transverse dimension along a direction substantially normal to the axis A at the rear-most portion of the first anti-slip ear or projection 30 is “d”. The dimension b≈2d. Also, a≈d and d>c. In an exemplary embodiment “a” is equal to 46.5 mm, “b” is equal to 88.54 mm, “c” is equal to 34.36 mm and “d” is equal to 43.05 mm, “e” is equal to 38.31 mm, “f” is equal to 75.59 mm and “g” is equal to 46.00 mm. Accordingly, the dimension of the handgrip 32 finger receiving space 36, between the anti-slip ear or projection 34 and the protrusion 38, for accommodating one or both of the index and middle fingers 44, 46, is approximately 42 mm, but may be within the range of 39-45 mm.

[0023] The protrusion 38 and the second anti-slip ear or projection 34 are arranged, as indicated, to create a receiving space 36 to accommodate the user's index and middle fingers. Preferably, the receiving space 36 is dimensioned to accommodate the user's index and middle fingers with little clearance so that both the second anti-slip ear or projection and the protrusion 38 serve and function to apply forces on the second handgrip along the axis A in the forward direction towards the cutting blade ends 18a, 20a.

[0024] With the construction in accordance with the invention, and referring to FIGS. 2 and 3, the second handgrip 32 generally forms an arc C to each side of the anti-slip ear or projection 34 with a center at a user's thumb. Such construction, especially when combined with the dimensions of the receiving space 36 it is possible for a user to use the snips in one of two different modes of operation, each with its benefits or advantages, as exemplified in FIGS. 2 and 3. Importantly, the user can move to either of the two hand positions easily and with equal comfort to render the tool ergonomic and highly functional.

[0025] While the embodiment shown in FIGS. 1-3 is a compound or multiplied leverage snips, or aviation snips, the invention can also be applied to simple or tinner's snips. The construction and the operation of the handgrips 12, 14 are essentially the same for any known snips, as the invention is primarily directed to the handgrip constructions and these can be used on any pliers, snips or the like with different degrees of advantage.

[0026] The foregoing is considered as illustrative only of the principles of the invention. Further modifications and changes will readily occur to those skilled in the art. The invention is not limited to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.