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(11) | EP 1 719 589 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Pivotal device for scissors |
| (57) A pair of scissors (B) includes two scissor elements (10,20) and a pivotal device.
Each scissor element (10) or (20) includes a countersink (11) or (21) extending from
a first side thereof through a second side thereof. The pivotal device includes a
screw (30) and a nut (40). The screw (30) includes a threaded shank (31) and enlarged
head (32). The nut (40) includes a shank (41) and an enlarged head (42), with a screw
hole (43) extending through the shank (41) and the enlarged head (42) of the nut (40).
The nut (40) is received in the countersink (11) or (21) of one of the scissor elements
(10,20), with the shank (41) of the nut (40) extending into the countersink (11) or
(21) of the other scissor element (10) or (20). The threaded shank (31) of the screw
(30) is engaged with the screw hole (43) of the nut (40).
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BACKGROUND OF THE INVENTION
1. Field of the Invention
2. Description of the Prior Art
[0002] Figs. 1 and 2 of the drawings illustrate a pair of conventional scissors A including a first scissor element 100 and a second scissor element 200. The first scissor element 100 and the second scissor element 200 are pivotally connected by a pivotal device consisting of a bolt or screw 300 and a nut 400. As illustrated in Fig. 2, on the first scissor element 100 is defined a through-hole 101 and on the second scissor element 200 is defined a countersink 201. The countersink 201 includes a relatively smaller section 202 aligned with the through-hole 101 of the first scissor element 100 and a relatively larger section 203.
[0003] The screw 300 has a threaded shank 301 extending through the relatively smaller section 202 of the countersink 201 and the through-hole 101 of the first scissor element 100 and then engaged with a screw hole (not labeled) of the nut 400, with an enlarged head 302 of the screw 300 being fittingly received in the relatively larger section 203 of the countersink 201.
[0004] Nevertheless, the pivotal arrangement is apt to be loosened in application of the scissors A, the relative pivotal rotation between the first scissor element 100 and the second scissor element 200 will bring on a rotation of the screw 300 relative to the nut 400 due to the nut 400 is unfixed, and this causes the screw 300 to be loosened or disengaged from the nut 400.
[0005] Furthermore, since the exposed nut 400 abuts against the outer surface of the first scissor element 100, it may cause interference to the opening and closing of the first scissor element 100 and the second scissor element 200 of the scissors A.
[0006] On the other hand, screwing the screw 300 with the nut 400 is not convenient since the user has to position the nut 400 with one hand while screwing the screw 300 with another hand.
[0007] The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
SUMMARY OF THE INVENTION
[0008] In accordance with an aspect of the invention, a pair of scissors in accordance with the present invention includes a first scissor element, a second scissor element, and a pivotal device for pivotally engaging the first scissor element with the second scissor element. The first scissor element includes a countersink extending from a first side of the first scissor element through a second side of the first scissor element. The countersink of the first scissor element has a relatively larger section facing away from the second scissor element and a relatively smaller section facing the second scissor element.
[0009] The second scissor element includes a countersink extending from a first side of the second scissor element through a second side of the second scissor element. The countersink of the second scissor element has a relatively larger section facing away from the first scissor element and a relatively smaller section facing the first scissor element and aligned with the relatively smaller section of the countersink of the first scissor element.
[0010] The pivotal device includes a screw and a nut. The screw includes a threaded shank and an enlarged head. The nut includes a shank and an enlarged head, with a screw hole extending through the shank and the enlarged head of the nut.
[0011] The nut is received in the countersink of the first scissor element, with the enlarged head of the nut being received in the relatively larger section of the countersink of the first scissor element, and with the shank extending through the relatively smaller section of the countersink of the first scissor element and the relatively smaller section of the countersink of the second scissor element.
[0012] The threaded shank of the screw is threadedly engaged with the screw hole of the nut, with the enlarged head of the screw being received in the relatively larger section of the countersink of the second scissor element.
[0013] Through engagement of the non-circular enlarged head in the non-circular larger section, the nut is non-rotatably received in the countersink of the first scissor element. Thus, the screw is less likely to rotate relative to the nut when the scissor elements pivot, and the risk of loosening of the screw and/or the nut is effectively reduced. A reliable pivotal arrangement is provided accordingly.
[0014] Since the nut is received in the countersink of the first scissor element without interfering the operation the first and the second scissor elements, the scissors can be used more easily.
[0015] Due to the nut is received in the countersink of the first scissor element, so it can be screwed with the screw more easily without requesting user to position the nut.
[0016] The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiments in accordance with the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017]
Fig. 1 is a perspective view of a pair of conventional scissors;
Fig. 2 is a sectional view illustrating pivotal arrangement of the pair of conventional scissors;
Fig. 3 is an exploded view of a pair of scissors in accordance with the present invention;
Fig. 4 is an assembly view of the pair of scissors in accordance with the present invention;
Fig. 5 is an enlarged view of the pivotal arrangement of the pair of scissors in accordance with the present invention;
Fig. 6 is a sectional view of the pivotal arrangement of the pair of scissors in accordance with the present invention;
Fig. 7 is a plan view a part of the pair of scissors in accordance with the present invention;
Fig. 8 is an exploded view of a pair of scissors in accordance with another embodiment of the present invention; and
Fig. 9 is an enlarged view of the pivotal arrangement of the pair of scissors in accordance with another embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0018] Referring to Figs. 3-7, a pair of scissors B in accordance with the present invention comprises a first scissor element 10, a second scissor element 20, and a pivotal device for pivotally engaging the first scissor element 10 with the second scissor element 20.
[0019] As illustrated in Fig. 3, the first scissor element 10 includes a countersink 11 extending from a first side of the first scissor element 10 through a second side of the first scissor element 10. The countersink 11 of the first scissor element 10 has a relatively larger section 12 facing away from the second scissor element 20 and a relatively smaller section 13 facing the second scissor element 20. The larger section 12 is of a non-circular shape, such as triangle, quadrangle... ellipse and other shapes. The larger section 12 as shown in Fig. 7 is of an approximate ellipse shape.
[0020] Similarly, the second element 20 includes a countersink 21 extending from a first side of the second scissor element 20 through a second side of the second scissor element 20. The countersink 21 of the second scissor element 20 has a relatively larger section 22 facing away from the first scissor element 10 and a relatively smaller section 23 facing the first scissor element 10 and aligned with the relatively smaller section 13 of the countersink 11 of the first scissor element 10.
[0021] The pivotal device includes a bolt or screw 30 and a nut 40. The screw 30 includes a threaded shank 31 (having an outer threading) and an enlarged head 32. The nut 40 includes a shank 41 and an enlarged head 42, with a screw hole 43 extending through the shank 41 and the enlarged head 42. Similarly, the enlarged head 42 is of a non-circular shape and formed correspondingly to the shape of the large section 12 as shown in Fig. 7.
[0022] In assembly, as illustrated in Fig. 6, the nut 40 is inserted into the countersink 11 of the first scissor element 10, with the enlarged head 42 being fittingly received in the relatively larger section 12 of the countersink 11, and with the shank 41 extending through the relatively smaller section 13 of the countersink 11 of the first scissor element 10 and the relatively smaller section 23 of the countersink 21 of the second scissor element 20. Next, the threaded shank 31 of the screw 30 is threadedly engaged with the screw hole 43 of the nut 40 until the enlarged head 32 of the screw 30 is fittingly received in the relatively larger section 22 of the countersink 21 of the second scissor element 20. The enlarged head 32 of the screw 30 includes a slot 33, allowing the user to drive the screw 30 with a screwdriver or the like.
[0023] As can be seen from Figs. 6 and 7, since the enlarged head 42 is engaged with the larger section 12 and they are of non-circular shape, the nut 40 is non-rotatably received in the countersink 11 of the first scissor element 10, so that no loosening problem will be caused when the first and the second scissor elements 10, 20 pivot relative to each other.
[0024] Furthermore, the nut 40 is non-rotatably received in the countersink 11 of the first scissor element 10, so that the nut 40 will not inference the operation of the first scissor element 10, thus the scissors can be used more conveniently.
[0025] Still because the nut 40 is non-rotatably received in the countersink 11 of the first scissor element 10, the screw 30 and the nut 40 can be screwed easily without requesting user to position the nut 40, making it easier and more convenient to pivotally connect the first scissor element 10 to the second scissor element 20.
[0026] Referring to Figs. 8 and 9, a pair of scissors in accordance with another embodiment of the present invention is similar with that of the first embodiment, except that the shank 41 of the nut 40 is engaged with the relatively smaller section 13 of the countersink 11 of the first scissor element 10.
a first scissor element;
a second scissor element;
a nut being non-rotatally disposed in the first scissor element; and
a screw being screwed with the nut after passing the second scissor element and the first scissor element, so as to pivotally connect the first scissor element with the second scissor element.
a first scissor element being defined with a countersink, the countersink including a relatively larger section;
a second scissor element;
a nut including an enlarged head engaged in the relatively larger section of the countersink of the first scissor element; and the enlarged head of the nut and the relatively larger section of the countersink of the first scissor element are of non-circular shape; and
a screw being screwed with the nut after passing the second scissor element and the first scissor element, so as to pivotally connect the first scissor element with the second scissor element.
a first scissor element being defined with a countersink, the countersink including a relatively smaller section;
a second scissor element;
a nut including a shank engaged in the relatively smaller section of the countersink of the first scissor element; and the shank of the nut and the relatively smaller section of the countersink of the first scissor element are of non-circular shape; and
a screw being screwed with the nut after passing the second scissor element and the first scissor element, so as to pivotally connect the first scissor element with the second scissor element.
Amended claims in accordance with Rule 86(2) EPC.
- the first scissor element (10) is defined with a countersink (11), the countersink (11) including a relatively larger section (12) and a relatively smaller section (13);
- the nut (40) includes an enlarged head (42) engaged in the relatively larger section (12) of the countersink (11) of the first scissor element (10) and a shank (41) engaged in the relatively smaller section (13) of the countersink (11) of the first scissor element (10);
- the enlarged head (42) or the shank (41) of the nut (40) and its respective engaging section of the countersink (11) of the first scissor element (10), respectively the relatively larger section (12) or smaller section (13) of the countersink (11), are of non-circular shape, the nut (40) being thus non-rotatably disposed in the first scissor element (10).