GB2173439A - Ceramic scissors - Google Patents
Ceramic scissors Download PDFInfo
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- GB2173439A GB2173439A GB08509376A GB8509376A GB2173439A GB 2173439 A GB2173439 A GB 2173439A GB 08509376 A GB08509376 A GB 08509376A GB 8509376 A GB8509376 A GB 8509376A GB 2173439 A GB2173439 A GB 2173439A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
- B26B13/00—Hand shears; Scissors
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Abstract
Ceramic scissors which comprise: a pair of scissor-pieces (1), each of the pair of scissor-pieces comprising a haft portion (6) and a knife portion (4) having an edge (2) and a back (4), at least the edge (2) of the knife portion being made of ceramics; and a connecting means 9, 10 for connecting the pair of scissor- pieces so as to permit opening and closing thereof. At least the haft portion (6) of each of the pair of scissor-pieces has a particular structure eg: a closed cavity 11 sufficient to bring the specific gravity of the above-mentioned ceramic scissors to under 1.0. <IMAGE>
Description
SPECIFICATION
Ceramic scissors
The present invention relates to ceramic scissors which have a high cutting quality, are not susceptible to rust, and are buoyant on the water.
Most conventional scissors have been made of metal such as carbon steel or stainless steel.
These metal scissors, initially showing a good cutting quality, cannot keep the good cutting quality for a long period of time because of the low hardness of the edge. Carbon steel scissors, having a higher cutting quality, are more susceptible to rust than stainless steel scissors. Stainless steel scissors are on the other hand less susceptible to rust but have a lower cutting quality than carbon steel scissors.
Different metal scissors have thus respective merits and demerits. With a view to solving the above-mentioned problems, therefore, ceramic scissors totally made of ceramics such as alumina or zirconia were developed. Ceramic scissors have a good cutting quality and are free of rust, but because these scissors are totally made of ceramics, may be subject to a breakage or a crack when the scissors are dropped by accident or a strong impact is applied to the scissors.
To solve the above-mentioned problem, therefore, ceramic scissors have been disclosed in
Japanese Utility Model Provisional Publication No. 58-106,073 (hereinafter referred to as the "prior art"). The ceramic scissors of the prior art are described below with reference to the drawings.
As shown in Fig. 1, the ceramic scissors of the prior art comprise a pair of scissor-pieces 1 identical in shape and dimensions and a connecting means for connecting the pair of scissorpieces 1 so as to permit opening and closing thereof. Each of the pair of scissor-pieces 1 comprises a knife portion 4 having an edge 2 and a back 3 and a haft portion 6 having a ring portion 5 for fingers at the rear end portion thereof. Each of the pair of scissor-pieces 1 has a connecting hole 7 for inserting a pin described later in the portion between the knife portion 4 and the haft portion 6. The knife portion 4 and the haft portion 6 of each of the pair of scissorpieces 1 are formed into an integral body with plastics such as nylon or polycarbonate, and the edge 2 of the knife portion 4 is made of ceramics such as alumina or zirconia. As shown in Fig.
2 illustrating a sectional view of Fig. 1 cut along the line A-A, the edge 2 of the knife portion 4 is fitted into a groove 8 provided on the back 3 of the knife portion 4, and is fixed to the back 3 of the knife portion 4 with an adhesive agent.
The above-mentioned connecting means comprises a pin 9 and a clasp 10. The connecting means connects the pair of scissor-pieces 1 so as to permit opening and closing thereof with the pin 9 as the fulcrum, by overlapping the pair of scissor-pieces 1 each other so that the edges 2 of the knife portions 4 face each other, inserting the pin 9 into the connecting holes 7 of the pair of scissor-pieces 1 and tightening the pair of scissor-pieces 1 toward each other by means of the pin 9 and the clasp 10.
The above-mentioned ceramic scissors of the prior art have a good cutting quality and a breakage or a crack does not occur in the scissors even when a strong impact is applied to the scissors since only the edge 2 of the knife portion 4 is made of ceramics.
However, the ceramic scissors of the prior art, having a specific gravity of over 1.0, are not buoyant on the water. Consequently, when one tries to cut a fishing-line while fishing on the sea and drops the ceramic scissors by mistake into the sea, it is impossible to recover the ceramic scissors.
Under such circumstances, there is a demand for the development of ceramic scissors which have a good cutting quality, are free of rust, and are buoyant on the water, but such ceramic scissors have not as yet been proposed.
An object of the present invention is therefore to provide cerramic scissors which have a good cutting quality, are free of rust, and are buoyant on the water.
In accordance with one of the features of the present invention, there are provided ceramic scissors which comprise:
a pair of scissor-pieces, each of said pair of scissor-pieces comprising a haft portion and a knife portion having an edge and a back, at least said edge of said knife portion being made of ceramics; and
a connecting means for connecting said pair of scissor-pieces so as to permit opening and closing thereof;
characterized in that:
said ceramic scissors have a specific gravity of under 1.0.
In the drawings: Figure 1 is an exploded perspective view illustrating ceramic scissors of the prior art;
Figure 2 is a sectional view of Fig. 1 cut along the line A-A;
Figure 3 is a plan view illustrating the ceramic scissors of the first embodiment of the present invention;
Figure 4 is a side view illustrating the ceramic scissors of the first embodiment of the present invention;
Figure 5 is a sectional view of Fig. 3 cut along the line A-A;
Figure 6 is another sectional view of Fig. 3 cut along the line B-B;
Figure 7 is a sectional view illustrating the haft portion of the ceramic scissors of the second embodiment of the present invention;
Figure 8 is a plan view illustrating the ceramic scissors of the third embodiment of the present invention;
Figure 9 is a sectional view of Fig. 8 cut along the line A-A;;
Figure 10 is a plan view illustrating the ceramic scissors of the fourth embodiment of the present invention;
Figure 11 is a side view illustrating the ceramic scissors of the fourth embodiment of the present invention;
Figure 12 is a plan view illustrating the knife portion of the ceramic scissors of the fourth embodiment of the present invention;
Figure 13 is a sectional view of Fig. 10 cut along the line A-A;
Figure 14 is a sectional view illustrating the haft portion of the ceramic scissors of the fifth embodiment of the present invention;
Figure 15 is a plan view illustrating the ceramic scissors of the sixth embodiment of the present invention;
Figure 16 is a side view illustrating the ceramic scissors of the sixth embodiment of the present invention;
Figure 17 is a plan view illustrating the ceramic scissors of the seventh embodiment of the present invention;;
Figure 18 is a side view illustrating the ceramic scissors of the seventh embodiment of the present invention;
Figure 19 is a plan view illustrating the knife portion of the ceramic scissors of the seventh embodiment of the present invention;
Figure 20 is a side view illustrating the knife portion of the ceramic scissors of the seventh embodiment of the present invention;
Figure 21 is a plan view illustrating the haft portion of the ceramic scissors of the seventh embodiment of the present invention;
Figure 22 is a sectional view of Fig. 21 cut along the line A-A;
Figure 23 is a sectional view illustrating the haft portion of the ceramic scissors of the eighth embodiment of the present invention;
Figure 24 is a plan view illustrating the ceramic scissors of the ninth embodiment of the present invention; and
Figure 25 is a sectional view of Fig. 24 cut along the line A-A.
From the above-mentioned point of view, we carried out extensive studies to develop ceramic scissors which have a good cutting quality, are free of rust, and are buoyant on the water. As a result, we obtained the finding that it is possible to manufacture ceramic scissors having a specific gravity of under 1.0 by providing a closed cavity in the ceramic scissors or sticking a piece of cork onto the ceramic scissors.
The present invention was made on the basis of the above-mentioned finding. The ceramic scissors of the present invention are described below with reference to the drawings.
Fig. 3 is a plan view illustrating ceramic scissors of the first embodiment of the present invention, and Fig. 4 is a side view of the above-mentioned ceramic scissors. As shown in Figs.
3 and 4, ceramic scissors of the first embodiment comprise a pair of scissor-pieces 1 identical in shape and dimensions, and a connecting means for connecting the pair of scissor-pieces 1 so as to permit opening and closing thereof. Each of the pair of scissor-pieces 1 comprises a knife portion 4 having an edge 2 and a back 3, and a haft portion 6 having a ring portion 5 for fingers at the rear end portion thereof. Each of the pair of scissor-pieces 1 has a connecting hole 7 for inserting a pin described later in the portion between the knife portion 4 and the haft portion 6.
As shown in Fig. 5 illustrating a sectional view of Fig. 3 cut along the line A-A, each of the pair of scissor-pieces 1 has therein a closed cavity 11 sufficient to bring the specific gravity of the ceramic scissors to under 1.0. A plurality of fine closed cavities sufficient to bring the specific gravity of the ceramic scissors to under 1.0 may be dispersed over each of the pair of scissor-pieces 1.
The knife portion 4 and the haft portion 6 of each of the pair of scissor-pieces 1 are formed into an integral body with plastics such as nylon or polycarbonate, and the edge 2 of the knife portion 4 is made of ceramics such as alumina or zirconia. As shown in Fig. 6 illustrating a sectional view of Fig. 3 cut along the line B-B, the edge 2 of the knife portion 4 is fitted into a groove 8 provided in the back 3 of the knife portion 4, and is fixed to the back 3 of the knife portion 4 with an adhesive agent.
The above-mentioned connecting means comprises a pin 9 and a clasp 10. The connecting means connects the pair of scissor-pieces 1 so as to permit opening and closing thereof with the pin 9 as the fulcrum, by overlapping the pair of scissor-pieces 1 each other so that the edges 2 of the knife portions 4 face each other, inserting the pin 9 into the connecting holes 7 of the pair of scissor-pieces 1 and tightening the pair of scissor-pieces 1 toward each other by means of the pin 9 and the clasp 10.
The above-mentioned ceramic scissors of the first embodiment of the present invention are always buoyant on the water since each of the pair of scissor-pieces 1 has therein at least one closed cavity 11 sufficient to bring the specific gravity of the ceramic scissors to under 1.0.
Now, the ceramic scissors of the second embodiment of the present invention are described below with reference to the drawings.
Fig. 7 is a sectional view illustrating the haft portion 6 of the ceramic scissors of the second embodiment of the present invention. The ceramic scissors of the second embodiment are substantially identical with the ceramic scissors of the first embodiment of the present invention described above except that the back 3 of the knife portion 4 and the haft portion 6 of each of the pair of scissor-pieces 1 are composed of a piece of cork 12 coated with plastics, sufficient to bring the specific gravity of the ceramic scissors to under 1.0.
The above-mentioned ceramic scissors of the second embodiment of the present invention are always buoyant on the water since the back 3 of the knife portion 4 and the haft portion 6 of each of the scissor-pieces 1 are composed of the piece of cork 12 coated with plastics, sufficient to bring the specific gravity of the ceramic scissors to under 1.0.
Now, the ceramic scissors of the third embodiment of the present invention are described below with reference to the drawings.
Fig. 8 is a plan view illustrating the ceramic scissors of the third embodiment of the present invention, and Fig. 9 is a sectional view of Fig. 8 cut along the line A-A. As shown in Figs. 8 and 9, the ceramic scissors of the third embodiment are substantially identical with the ceramic scissors of the first embodiment of the present invention described above except that each of the pair of scissor-pieces 1 has on part of the surface thereof a piece of cork 13 stuck thereon, sufficient to bring the specific gravity of the ceramic scissors to under 1.0. The piece of cork 13 may be stuck on the entire surface of each of the pair of scissor-pieces 1.
The above-mentioned ceramic scissors of the third embodiment of the present invention are always buoyant on the water since the piece of cork 13 sufficient to bring the specific gravity of the ceramic scissors to under 1.0 is stuck on at least part of the surface of each of the pair of scissor-pieces 1.
Now, the ceramic scissors of the fourth embodiment of the present invention are described below with reference to the drawings.
Fig. 10 is a plan view illustrating the ceramic scissors of the fourth embodiment of the present invention, Fig. 11 is a side view illustrating the ceramic scissors of the fourth embodiment, and
Fig. 12 is a plan view illustrating the knife portion of the ceramic scissors of the fourth embodiment. As shown in Figs. 10, 11 and 12, the ceramic scissors of the fourth embodiment comprise a pair of scissor-pieces 1 identical in shape and dimensions and a connecting means for elastically connecting the pair of scissor-pieces 1 so as to permit opening and closing thereof. Each of the pair of scissor-pieces 1 comprises a haft portion 6 and a knife portion 4 having an edge 2 and a back 3.The haft portion 6 and the knife portion 4 of each of the pair of scissor-pieces 1 are formed into an integral body with plastics such as nylon or polycarbonate, and the edge 2 of the knife portion 4 is made of ceramics such as alumina or zirconia.
The edge 2 of the knife portion 4 is fitted into a groove 14 provided on the back 3 of the knife portion 4, and the edge 2 of the knife portion 4 is fixed to the back 3 of the knife portion 4 with an adhesive agent.
Each of the pair of scissor-pieces 1 has therein a closed cavity 15 sufficient to bring the specific gravity of the ceramic scissors to under 1.0, as shown in Fig. 13 illustrating a sectional view of Fig. 10 cut along the line A-A. A plurality of fine closed cavities sufficient to bring the specific gravity of the ceramic scissors to under 1.0 may be dispersed over each of the pair of scissor-pieces 1.
The above-mentioned connecting means comprises a spring 17. The connecting means elastically connects the pair of scissor-pieces 1 so as to permit opening and closing thereof with the spring 17 as the fulcrum, by overlapping the pair of scissor-pieces 1 each other so that the edges 2 of the knife portions 4 face each other and hooking the spring 17 to the rear ends of the pair of scissor-pieces 1.
The above-mentioned ceramic scissors of the fourth embodiment of the present invention are always buoyant on the water since each of the pair of scissor-pieces 1 has therein at least one closed cavity 15 sufficient to bring the specific gravity of the ceramic scissors to under 1.0.
Now the ceramic scissors of the fifth embodiment of the present invention are described below with reference to the drawings.
Fig. 14 is a sectional view illustrating the haft portion 6 of the ceramic scissors of the fifth embodiment of the present invention. The ceramic scissors of the fifth embodiment are substantially identical with the ceramic scissors of the fourth embodiment of the present invention described above except that the knife portion 4 and the haft portion 6 of each of the pair of scissor-pieces 1 are composed of a piece of cork 16 coated with plastics, sufficient to bring the specific gravity of the ceramic scissors to under 1.0.
The above-mentioned ceramic scissors of the fifth embodiment of the present invention are always buoyant on the water since the knife portion 4 and the haft portion 6 of each of the pair of scissor-pieces 1 are composed of the piece of cork 16 coated with plastics, sufficient to bring the specific gravity of the ceramic scissors to under 1.0.
Now, the ceramic scissors of the sixth embodiment of the present invention are described below with reference to the drawings.
Fig. 15 is a plan view illustrating the ceramic scissors of the sixth embodiment of the present invention, and Fig. 16 is a side view illustrating the ceramic scissors of the sixth embodiment.
As shown in Figs. 15 and 16, the ceramic scissors of the sixth embodiment are substantially identical with the ceramic scissors of the fourth embodiment of the present invention described above except that each of the pair of scissor-pieces 1 has on part of the surface thereof a piece of cork 18 stuck thereon, sufficient to bring the specific gravity of the ceramic scissors to under 1.0. The piece of cork 18 may be stuck on the entire surface of each of the pair of scissorpieces 1.
The above-mentioned ceramic scissors of the sixth embodiment of the present invention are always buoyant on the water since the piece of cork 18 sufficient to bring the specific gravity of the ceramic scissors to under 1.0 is stuck on at least part of the surface of each of the pair of scissor-pieces 1.
Now, the ceramic scissors of the seventh embodiment of the present invention are described below with reference to the drawings.
Fig. 17 is a plan view illustrating the ceramic scissors of the seventh embodiment of the present invention, and Fig. 18 is a side view illustrating the ceramic scissors of the seventh embodiment. As shown in Figs. 17 and 18, the ceramic scissors of the seventh embodiment comprise a pair of scissor-pieces 1 identical in shape and dimensions and a connecting means for connecting the pair of scissor-pieces 1 so as to permit opening and closing thereof.
Each of the scissor-pieces 1 is, as shown in Figs. 19 and 21, divided into a haft portion 6 and a knife portion 4 having an edge 2 and a back 3.
The edge 2 and the back 3 of the knife portion 4 of each of the pair of scissor-pieces 1 are formed into an integral body with ceramics such as alumina or zirconia. The knife portion 4 of each of the scissor-pieces 1 has, as shown in Figs. 19 and 20, a connecting hole 19 for inserting a pin described later in the rear end portion thereof.
The haft portion 6 of each of the pair of scissor-pieces 1 is made of plastics such as nylon or polycarbonate. As shown in Fig. 21, the haft portion 6 has in the top end portion thereof a concave seat 20 for receiving the rear end portion of the knife portion 4, and a connecting hole 21 for inserting a pin described later. The rear end portion of the above-mentioned knife portion 4 is fitted into the concave seat 20 of the haft portion 6 so that the connecting hole 19 of the knife portion 4 agrees to the connecting hole 21 of the haft portion 6, and the knife portion 4 is fixed to the haft portion 6 with an adhesive agent. The haft portion 6 has at the rear end portion thereof a ring portion 5 for fingers.The haft portion 6 of each of the pair of scissorpieces 1 has therein a closed cavity 22 sufficient to bring the specific gravity of the ceramic scissors to under 1.0, as shown in Fig. 22 illustrating a sectional view of Fig. 21 cut along the line A-A. A plurality of fine closed cavities sufficient to bring the specific gravity of the ceramic scissors to under 1.0 may be dispersed over the haft portion 6 of each of the pair of scissorpieces 1.
The above-mentioned connecting means comprises a pin 9 and a clasp 10. The connecting means connects the pair of scissor-pieces 1 so as to permit opening and closing thereof with the pin 9 as the fulcrum, by overlapping the pair of scissor-pieces 1 each other so that the edges 2 of the knife portions 4 face each other, inserting the pin 9 into the connecting hole 19 of the knife portion 4 and the connecting hole 21 of the haft portion 6 which agree to each other, and tightening the pair of scissor-pieces 1 toward each other by means of the pin 9 and the clasp 10.
The above-mentioned ceramic scissors of the seventh embodiment of the present invention are always buoyant on the water since the haft portion 6 of each of the pair of scissor-pieces 1 has therein at least one closed cavity 22 sufficient to bring the specific gravity of the ceramic scissors to under 1.0.
Now, the ceramic scissors of the eighth embodiment of the present invention are described below with reference to the drawings.
Fig. 23 is a sectional view illustrating the haft portion 6 of the ceramic scissors of the eighth embodiment of the present invention. The ceramic scissors of the eighth embodiment are substantially identical with the ceramic scissors of the seventh embodiment of the present invention described above except that the haft portion 6 of each of the pair of scissor-pieces 1 is composed of a piece of cork 23 coated with plastics, sufficient to bring the specific gravity of the ceramic scissors to under 1.0.
The above-mentioned ceramic scissors of the eighth embodiment of the present invention are always buoyant on the water since the haft portion 6 of each of the pair of scissor-pieces 1 is composed of the piece of cork 23 coated with plastics, sufficient to bring the specific gravity of the ceramic scissors to under 1.0.
Finally, the ceramic scissors of the ninth embodiment of the present invention are described below with reference to the drawings.
Fig. 24 is a plan view illustrating the ceramic scissors of the ninth embodiment of the present invention, and Fig. 25 is a sectional view of Fig. 24 cut along the line A-A. As shown in Figs.
24 and 25, the ceramic scissors of the ninth embodiment are substantially identical with the ceramic scissors of the eighth embodiment of the present invention described above except that a piece of cork 24 sufficient to bring the specific gravity of the ceramic scissors to under 1.0 is stuck on part of the surface of the haft portion 6 of each of the pair of scissor-pieces 1. The piece of cork 24 may be stuck on the entire surface of the haft portion 6 of each of the pair of scissor-pieces 1.
Now, examples of the ceramic scissors of the present invention are described.
EXAMPLE 1
Edges 2 each having the shape as illustrated in Fig. 12 were prepared using the various ceramics having the properties shown in Table 1, and four pairs of ceramic scissors each having the structure as illustrated in Figs. 10, 11 and 13 were manufactured with the use of these edges 2 thus prepared. In each pair of ceramic scissors, the knife portion 4 and the haft portion 6 of each of the pair of scissor-pieces 1 were formed with nylon into an integral body, and the closed cavity 15 was formed in each of the pair of scissor-pieces 1.
Table 1
Alumina Zirconia Silicon Silicon Alumina nitride carbide Hardness (Hmr) 1800 1700 1900 1900 Bending strength 30 50 60 60 (kg/rnm2) Corrosion resistance 0.2 0.3 0.4 0.4 (n'mg/cm3) Specific gravity 3.9 5.8 3.2 3.1 In Table 1, corrosion resistance respresents the quantity of weight loss of test pieces of all the ceramics after immersion into 95% sulfuric acid for 24 hours.
The specific gravity was calculated for each pair of ceramic scissors thus manufactured. The results are shown in Table 2. In Table 2, (1) represents alumina scissors, (2), zirconia scissors, (3), silicon nitride scissors, and (4), silicon carbide scissors (the same applies also to the subsequent tables).
Table 2
(1) (2) (3) (4) 0.80 0.92 0.76 0.75 The specific gravity of each pair of ceramic scissors was calculated under the following conditions: (1) Volume of each pair of ceramic scissors : 15.8 (cm3), and (2) Weight of each pair of ceramic scissors as shown in Table 3:
Table 3
(1) (2) t3) (4) 12.7 (g) 14.5 (g) 12.0 (g) I 11.9 (g) As is clear from Table 2, all the pairs of ceramic scissors have a specific gravity of under 1.0 and are therefore buoyant on the water.
EXAMPLE 2
Edges 2 each having the shape as illustrated in Fig. 12 were prepared using the various ceramics having the properties shown in Table 1, and four pairs of ceramic scissors each having the structure as illustrated in Figs. 15 and 16 were manufactured with the use of these edges 2 thus prepared. In each pair of ceramic scissors, the knife portion 4 and the haft portion 6 of each of the pair of scissor-pieces 1 were formed with nylon into an integral body, and the piece of cork 18 having the specific gravity of 0.52 was stuck onto the surface of the haft portion 6 of each of the pair of scissor-pieces 1.
The specific gravity was calculated for each pair of ceramic scissors thus manufactured. The results are shown in Table 4.
Table 4
(1) (2) (3) (4) ~ ~ 0.77 0.89 0.73 0.73 The specific gravity of each pair of ceramic scissors was calculated under the following conditions: (1) Volume of each pair of ceramic scissors : 15.8 (cm3), and (2) Weight of each pair of ceramic scissors as shown in Table 5:
Table 5
(1) (2) L (3) (4) 12.2 (g) 14.1 (g) 11.6 (g) 11.5 (g) As is clear from Table 4, all the pairs of ceramic scissors have a specific gravity of under 1.0, and are therefore buoyant on the water.
EXAMPLE 3
Knife portions 4 each having the shape as illustrated in Figs. 19 and 20 were prepared with the use of various ceramics having the properties shown in Table 1, and haft portions 6 each having the shape as illustrated in Figs. 21 and 22, and then, four pairs of ceramic scissors each having the structure as illustrated in Figs. 17 and 18 were manufactured with the use of these knife portions 4 and haft portions 6 thus prepared. In each pair of ceramic scissors, haft portion 6 of each of the pair of scissor-pieces 1 was made of FRP (Fiber Reinforced Plastics), and the closed cavity 22 was formed in the haft portion 6 of each of the pair of scissor-pieces 1.
The specific gravity was calculated for each pair of ceramic scissors thus manufactured. The results are shown in Table 6.
Table 6
(1) (2) (3) (4) 0.75 0.89 0.70 0.69 The specific gravity of each pair of ceramic scissors was calculated under the following conditions: (1) Volume of each of pair of ceramic scissors : 10.9 (cm3), and (2) Weight of each pair of ceramic scissors as shown in Table 7:
Table 7
- -- - - (1) (2) (3) (4) 8.17 (g) 9.69 (g) 7.61 (g) 7.53 (g) As is clear from Table 6, all the pairs of ceramic scissors have a specific gravity of under 1.0, and are therefore buoyant on the water.
EXAMPLE 4
Knife portions 4 each having the shape as illustrated in Figs. 19 and 20 were prepared with the use of various ceramics having the properties shown in Table 1, and haft portions 6 each having the shape illustrated in Fig. 21, and then, four pairs of ceramic scissors each having the structure as illustrated in Figs. 17 and 18 were manufactured with the use of these knife portions 4 and haft portions 6 thus prepared. In each pair of ceramic scissors, haft portion 6 of each of the pair of scissor-pieces 1 was made of nylon, and the plurality of fine closed cavities were formed in the haft portion 6 of each of the pair of scissor-pieces 1.
The specific gravity was calculated for each pair of ceramic scissors thus manufactured. The results are shown in Table 8.
Table 8
(1) (2) 1 (3) 1 (4) 0.84 1 0.98 1 0.79 1 0.78 The specific gravity of each pair of ceramic scissors was calculated under the following conditions: (1) Volume of each pair of ceramic scissors : 10.9 (cm3), and (2) Weight of each pair of ceramic scissors as shown in Table 9:
Table 9
(1) (2) 1 (3) (4) 9.18 (g) 10.7 (g) i 8.62 (g) 8.54 (g) As is clear from Table 8, all the pairs of ceramic scissors have a specific gravity of under 1.0, and are therefore buoyant on the water.
According to the present invention, as described above, it is possible to manufacture ceramic scissors which have a good cutting quality, are free of rust, and are buoyant on the water.
Claims (11)
1. Ceramic scissors which comprise:
a pair of scissor-pieces, each of said pair of scissor-pieces comprising a haft portion and a knife portion having an edge and a back, at least said edge of said knife portion being made of ceramics; and
a connecting means for connecting said pair of scissor-pieces so as to permit opening and closing thereof; characterized in that:
said ceramic scissors have a specific gravity of under 1.0.
2. The ceramic scissors as claimed in Claim 1, characterized in that:
said haft portion (6) and said knife portion (4) of each of said pair of scissor-pieces (1) are formed with plastics into an integral body, said edge (2) of said knife portion (4) being secured in a groove (8) provided on said back (3) of said knife portion (4), each of said pair of scissorpieces (1) having a connecting hole (7) in a portion between said haft portion (6) and said knife portion (4);;
said connecting means comprises a pin (9) and a clasp (10), said connecting means connecting said pair of scissor-pieces (1) so as to permit opening and closing thereof with said pin (9) as the fulcrum, by overlapping said pair of scissor-pieces (1) each other so that said edges (2) of said knife portions (4) face each other, inserting said pin (9) into said connecting holes (7) of said pair of scissor-pieces (1) and tightening said pair of scissor-pieces (1) toward each other by means of said pin (9) and said clasp (10); and
each of said pair of scissor-pieces (1) has therein at least one closed cavity (11) sufficient to bring the specific gravity of said ceramic scissors to under 1.0.
3. The ceramic scissors as claimed in Claim 1, characterized in that.
said haft portion (6) and said knife portion (4) of each of said pair of scissor-pieces (1) are formed into an integral body, said edge (2) of said knife portion (4) being secured in a groove (8) provided on said back (3) of said knife portion (4), each of said pair of scissor-pieces (1) having a connecting hole (7) in a portion between said haft portion (6) and said knife portion (4);;
said connecting means comprises a pin (9) and a clasp (10), said connecting means connecting said pair of scissor-pieces (1) so as to permit opening and closing thereof with said pin (9) as the fulcrum, by overlapping said pair of scissor-pieces (1) each other so that said edges (2) of said knife portions (4) face each other, inserting said pin (9) into said connecting holes (7) of said pair of scissor-pieces (1) and tightening said pair of scissor-pieces (1) toward each other by means of said pin (9) and said clasp (10); and
each of said pair of scissor-pieces (1) is composed of a piece of cork (12) coated with plastics, sufficient to bring the specific gravity of said ceramic scissors to under 1.0.
4. The ceramic scissors as claimed in Claim 1, characterized in that:
said haft portion (6) and said knife portion (4) of each of said pair of scissor-pieces (1) are formed with plastics into an integral body, said edge (2) of said knife portion (4) being secured in a groove (8) provided on said back (3) of said knife portion (4), each of said pair of scissorpieces (1) having a connecting hole (7) in a portion between said haft portion (6) and said knife portion (4);;
said connecting means comprises a pin (9) and a clasp (10), said connecting means connecting said pair of scissor-pieces (1) so as to permit opening and closing thereof with said pin (9) as the fulcrum by overlapping said pair of scissor-pieces (1) each other so that said edges (2) of said knife portions (4) face each other, inserting said pin (9) into said connecting holes (7) of said pair of scissor-pieces (1) and tightening said pair of scissor-pieces (1) toward each other by means of said pin (9) and said clasp (10); and
each of said pair of scissor-pieces (1) has on at least part of the surface thereof a piece of cork (13) stuck thereon, sufficient to bring the specific gravity of said ceramic scissors to under 1.0.
5. The ceramic scissors as claimed in Claim 1, characterized in that:
said haft portion (6) and said knife portion (4) of each of said pair of scissor-pieces (1) are formed with plastics into an integral body, said edge (2) of said knife portion (4) being secured in a groove (14) provided on said back (3) of said knife portion (4);
said connecting means comprises a spring (17), said connecting means elastically connecting said pair of scissor-pieces (1) so as to permit opening and closing thereof with said spring (17) as the fulcrum, by overlapping said pair of scissor-pieces (1) each other so that said edges (2) of said knife portions (4) face each other and hooking said spring (17) to the rear ends of said pair of scissor-pieces (1); and
each of said pair of scissor-pieces (1) has therein at least one closed cavity (15) sufficient to bring the specific gravity of said ceramic scissors to under 1.0.
6. The ceramic scissors as claimed in Claim 1, characterized in that:
said haft portion (6) and said knife portion (4) of each of said pair of scissor-pieces (1) are formed into an integral body, said edge (2) of said knife portion (4) being secured in a groove (14) provided on said back (3) of said knife portion (4);
said connecting means comprises a spring (17), said connecting means elastically connecting said pair of scissor-pieces (1) so as to permit opening and closing thereof with said spring (17) as the fulcrum, by overlapping said pair of scissor-pieces (1) each other so that said edges (2) of said knife portions (4) face each other and hooking said spring (17) to the rear ends of said pair of scissor-pieces (1); and
each of said pair of scissor-pieces is composed of a piece of cork (16) coated with plastics, sufficient to bring the specific gravity of said ceramic scissors to under 1.0.
7. The ceramic scissors as claimed in Claim 1, characterized in that:
said haft portion (6) and said knife portion (4) of each of said pair of scissor-pieces (1) are formed with plastics into an integral body, said edge (2) of said knife portion (4) being secured in a groove (14) provided on said back (3) of said knife portion (4);
said connecting means comprises a spring (17), said connecting means elastically connecting said pair of scissor-pieces (1) so as to permit opening and closing thereof with said spring (17) as the fulcrum, by overlapping said pair of scissor-pieces (1) each other so that said edges (2) of said knife portions (4) face each other and hooking said spring (17) to the rear ends of said pair of scissor-pieces (1); and
each of said pair of scissor-pieces (1) has on at least part of the surface thereof a piece of cork (18) stuck thereon, sufficient to bring the specific gravity of said ceramic scissors to under 1.0.
8. The ceramic scissors as claimed in Claim 1, characterized in that:
each of said pair of scissor-pieces (1) is divided into said haft portion (6) and knife portion (4), said edge (2) and said back (3) of said knife portion (4) being formed with ceramics into an integral body, the rear end portion of said knife portion (4) being secured in a concave seat (20) provided at the top end portion of said haft portion (6), each of said pair of scissor-pieces (1) having a connecting hole (21, 19) in a portion between said haft portion (6) and said knife portion (4);;
said connecting means comprises a pin (9) and a clasp (10), said connecting means connecting said pair of scissor-pieces (1) so as to permit opening and closing thereof with said pin (9) as the fulcrum, by overlapping said pair of scissor-pieces (1) each other so that said edges (2) of said knife portions (4) face each other, inserting said pin (9) into said connecting holes (21, 19) of said pair of scissor-pieces (1) and tightening said pair of scissor-pieces (1) toward each other by means of said pin (9) and said clasp (10); and
said haft portion (6) of each of said pair of scissor-pieces (1) is made of plastics, and said haft portion (6) of each of said pair of scissor-pieces (1) having therein at least one closed cavity (22) sufficient to bring the specific gravity of said ceramic scissors to under 1.0.
9. The ceramic scissors as claimed in Claim 1, characterized in that:
each of said pair of scissor-pieces (1) is divided into said haft portion (6) and said knife portion (4), said edge (2) and said back (3) of said knife portion (4) being formed with ceramics into an integral body, the rear end portion of said knife portion (4) being secured in a concave seat (20) provided at the top end portion of said haft portion (6), each of said pair of scissorpieces (1) having a connecting hole (21, 19) in a portion between said haft portion (6) and said knife portion (4); ;
said connecting means comprises a pin (9) and a clasp (10), said connecting means connecting said pair of scissor-pieces (1) so as to permit opening and closing thereof with said pin (9) as the fulcrum, by overlapping said pair of scissor-pieces (1) each other so that said edges (2) of said knife portions (4) face each other, inserting said pin (9) into said connecting holes (21, 19) of said pair of scissor-pieces (1) and tightening said pair of scissor-pieces (1) toward each other by means of said pin (9) and said clasp (10); and
said haft portion (6) of each of said pair of scissor-pieces (1) is composed of a piece of cork (23) coated with plastics, sufficient to bring the specific gravity of said ceramic scissors to under 1.0.
10. The ceramic scissors as claimed in Claim 1, characterized in that:
each of said pair of scissor-pieces (1) is divided into said haft portion (6) and said knife portion (4), said edge (2) and said back (3) of said knife portion (4) being formed with ceramics into an integral body, the rear end portion of said knife portion (4) being secured in a concave seat (20) provided at the top end portion of said haft portion (6), each of said pair of scissorpieces (1) having a connecting hole (21, 19) in a portion between said haft portion (6) and said knife portion (4);;
said connecting means comprises a pin (9) and a clasp (10), said connecting means connecting said pair of scissor-pieces (1) so as to permit opening and closing thereof with said pin (9) as the fulcrum, by overlapping said pair of scissor-pieces (1) each other so that said edges (2) of said knife portions (4) face each other, inserting said pin (9) into said connecting holes (21, 19) of said pair of scissor-pieces (1) and tightening said pair of scissor-pieces (1) toward each other by means of said pin (9) and said clasp (10); and
said haft portion (6) of each of said pair of scissor-pieces (1) is made of plastics, and said haft portion (6) of each of said pair of scissor-pieces (1) having on at least part of the surface thereof a piece of cork (24) stuck thereon, sufficient to bring the specific gravity of said ceramic scissors to under 1.0.
11. Ceramic scissors substantially as hereinbefore described with reference to, and as illustrated in, Figs. 3 to 6, or Fig. 7, or Figs. 8 and 9, or Figs. 10 to 13 or Fig. 14 or Figs. 15 and
16, or Figs. 17 to 22 or Fig. 23 or Figs. 24 and 25, of the accompanying drawings.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08509376A GB2173439B (en) | 1985-04-12 | 1985-04-12 | Ceramic scissors |
| FR8506787A FR2581340B1 (en) | 1985-04-12 | 1985-05-03 | CERAMIC SCISSORS |
| AU44287/85A AU568752B2 (en) | 1985-04-12 | 1985-06-28 | Ceramic scissors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08509376A GB2173439B (en) | 1985-04-12 | 1985-04-12 | Ceramic scissors |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8509376D0 GB8509376D0 (en) | 1985-05-15 |
| GB2173439A true GB2173439A (en) | 1986-10-15 |
| GB2173439B GB2173439B (en) | 1988-05-18 |
Family
ID=10577518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08509376A Expired GB2173439B (en) | 1985-04-12 | 1985-04-12 | Ceramic scissors |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU568752B2 (en) |
| FR (1) | FR2581340B1 (en) |
| GB (1) | GB2173439B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2605545A1 (en) * | 1986-10-22 | 1988-04-29 | Gautier Jean | Improvements to instruments operating by scissors action |
| GB2239831A (en) * | 1989-06-13 | 1991-07-17 | Burntstone Ceramic Limited | Cutting blade and device |
| EP0653273A2 (en) * | 1993-10-18 | 1995-05-17 | Snap-On Incorporated | Composite plier/cutter tool with shear action cutter insert |
| CN102922542A (en) * | 2012-11-26 | 2013-02-13 | 上海陶宝陶瓷新材料开发有限公司 | Ceramic barber shears |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2579773A (en) * | 1949-04-22 | 1951-12-25 | Louis W Randall | Shears |
| DE1927303C3 (en) * | 1969-05-29 | 1975-09-11 | J. Wiss & Sons Co., Newark, N.J. (V.St.A.) | scissors |
| FR2312334A1 (en) * | 1975-05-27 | 1976-12-24 | Philip Morris Inc | Moulded plastic handle for safety razor - is of rectangular plate form for gripping in hand and of density to enable razor to float on water(BR071276) |
| FR2553329A1 (en) * | 1983-10-18 | 1985-04-19 | Lafarge Refractaires | Cutting-out apparatus and sharpening apparatus having their cutting parts made from ceramic |
-
1985
- 1985-04-12 GB GB08509376A patent/GB2173439B/en not_active Expired
- 1985-05-03 FR FR8506787A patent/FR2581340B1/en not_active Expired
- 1985-06-28 AU AU44287/85A patent/AU568752B2/en not_active Ceased
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2605545A1 (en) * | 1986-10-22 | 1988-04-29 | Gautier Jean | Improvements to instruments operating by scissors action |
| GB2239831A (en) * | 1989-06-13 | 1991-07-17 | Burntstone Ceramic Limited | Cutting blade and device |
| EP0653273A2 (en) * | 1993-10-18 | 1995-05-17 | Snap-On Incorporated | Composite plier/cutter tool with shear action cutter insert |
| EP0653273A3 (en) * | 1993-10-18 | 1995-09-06 | Snap On Tools Corp | Composite plier/cutter tool with shear action cutter insert. |
| US5485641A (en) * | 1993-10-18 | 1996-01-23 | Snap-On Incorporated | Composite/plier cutter tool with shear action cutter insert |
| CN102922542A (en) * | 2012-11-26 | 2013-02-13 | 上海陶宝陶瓷新材料开发有限公司 | Ceramic barber shears |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2173439B (en) | 1988-05-18 |
| FR2581340B1 (en) | 1989-06-30 |
| AU4428785A (en) | 1987-01-08 |
| AU568752B2 (en) | 1988-01-07 |
| GB8509376D0 (en) | 1985-05-15 |
| FR2581340A1 (en) | 1986-11-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930412 |