Patent Application
20070020018
The present invention relates to a barrel for a writing implement, having a grip part covered with a grip covering member. More specifically, the present invention relates to a barrel for a writing implement, provided with a grip covering member formed by assembling a soft inner member and an outer member.
A known barrel for a writing implement has a grip part covered with a grip covering member formed by assembling an inner member of a soft material and an outer member.
A writing implement having such a barrel is disclosed in JP 8-197883 A relating to “Grip Structure for Writing Implement and Coating Tool”. This known writing implement is provided with a flexible, cylindrical grip member sealing therein a gas, a liquid, a gel or a jelly.
A grip for a writing implement is disclosed in JP 2000-355185 A relating to “Grip for Writing Implement”. This known grip has an inner member having a Shore hardness between Hs5 and Hs30 (JIS A) and an outer member having a Shore hardness of Hs40 (JIS A) or above. A grip for a writing implement is disclosed in JP 09-169194 A relating to “Grip for Writing Implement”. This known grip is formed by partially fusing together two types of resin members respectively having different hardnesses.
Patent document 1: JP 8-197883 A
Patent document 2: JP 2000-355185 A
Patent document 3: JP 09-169194 A
Problem to be Solved by the Invention
The flexible, cylindrical grip member sealing therein a gas, a liquid, a gel or a jelly disclosed in Patent document 1 is difficult to fabricate and the gas, the liquid, the gel or the jelly sealed in the flexible, cylindrical grip and it is likely that the gas, the liquid, the gel or the jelly leaks out.
The inner and the outer member of the grip disclosed in Patent document 3 are formed on a barrel by a dip coating method, a spray coating method or a two-color injection molding method. The boundary surfaces of the inner and the outer member are fused together or bonded together. Although dependent on surface roughness, it is very difficult to assemble the grip by covering the previously formed inner member with the outer member because the inner and the outer member made of soft materials need to slide relative to each other and frictional resistance against the relative sliding movement of the inner and the outer member made of soft materials.
Joining the inner and the outer member by fusion is difficult and costly, the grip thus fabricated is expensive and is not suitable for use on low-price products. It is likely that the respective hardnesses of the inner and the outer member changes when the inner and the outer member are joined together by fusion. When the outer member is transparent or semitransparent and the inner and outer member are colored in different colors, respectively, the colors of the inner and the outer member are mixed in the interface between the inner and the outer member and, consequently, the grip cannot be formed in a desired color.
Accordingly, it is an object of the present invention to provide a barrel for a writing implement, provided with a grip having an inner member and an outer member that can be easily assembled.
Means for Solving the Problem
Invention
The present invention capable solving the foregoing problem will be described. Parenthesized reference characters corresponding to reference characters to be used for indicating elements of embodiments of the present invention will be attached to elements of the present invention that will be described herein to facilitate understanding the correspondence of the elements that will be described herein and those of the embodiments. The present invention will be described using the reference characters indicating the elements of the embodiments of the present invention to facilitate understanding the present invention. The present invention is not limited in its practical application to the preferred embodiments described herein.
The present invention provides a barrel (1, 11) for a writing implement formed by putting a grip member (G, G′) of layered structure formed by assembling an inner member (4, 14) of a soft material and an outer member (5, 15) on a gripping part (3) of a barrel body (2). The inner member (4, 14) is covered with the outer member (5, 15). At least either of the outside surface (4b, 14b) of the inner member (4, 14) and the outside surface (5b, 15b) of the outer member (5, 15) is formed in an assembly facilitating shape (31, 41, 51) for facilitating putting the outer member on the inner member.
The assembly facilitating shape (31, 41, 51) may be a protruding and depressed shape.
The assembly facilitating shape may be a tapered shape.
The outer member (5, 15) may be put on the inner member (4, 14) so as to be separable from the inner member (4, 14) and the barrel body (2).
The outer member (5, 15) may be transparent or semitransparent and the inner member (4, 14) may be colored in a color different from that of the outer member (5, 15).
The inside surface of the outer member (5) may be glossy.
The inner member (4, 14) and the outer member (5, 15) may be made of materials of different hardnesses, respectively, the inner member (4, 14) may be made of a soft material having a low hardness, and the outer member (5, 15) may be made of a soft material having a high hardness.
The inside diameter of the outer member (5, 15) may be greater than the outside diameter of the inner member (4, 14), and the outer member (5, 15) may be axially compressed when put on the grip part (3) of the barrel body (2).
The outer member (15) may be provided with a radially inwardly extending protrusion (20) at the front end thereof and the back end surface (20a) of the protrusion (20) may be in contact with the front end surface (14a) of the inner member (14).
A part of the outer member (5, 15) corresponding to the inner member (4, 14) may have a mean wall thickness between 1 and 5 mm.
Operation of the Invention
The barrel (1, 11) for a writing implement is provided with the layered grip member (G, G′) formed by assembling the inner member (4, 14) of a soft material and the outer member (5, 15) and put on the gripping part (3) of the barrel body (2). The inner member (4, 14) is covered with the outer member (5, 15). At least either of the outside surface (4b, 14b) of the inner member (4, 14) and the outside surface (5b, 15b) of the outer member (5, 15) is formed in the assembly facilitating shape (31, 41, 51) for facilitating putting the outer member on the inner member.
Therefore, in the barrel (1, 11) for a writing implement according to the present invention, the inner member (4, 14) can be easily covered with the outer member (5, 15), and hence the grip member (G, G′) can be easily assembled.
When the assembly facilitating shape (31, 41, 51) is a protruding and depressed shape, resistance against the sliding movement of the outer member (5) along the inner member (4) is low and hence the outer member (5) can be easily put on the inner member (4). When the outer member (5) is deformed to bring the outer member (5) into close contact with the inner member (4), the protruding and depressed shape facilitates the flow of air into a space between the inner member (4) and the outer member (5). Consequently, outer member (5) in close contact with the inner member (4) can easily restore its original state.
When the assembly facilitating shape is a tapered shape, the outer member (5, 15) can be easily put on the inner member (4, 14).
When the outer member (5, 15) is detachably put on the inner member (4, 14) put on the barrel body (2) and is not bonded or fused to the inner member (4, 14), the outer member (5, 15) can be replaced with an outer member of a color and a hardness desired by the user.
When the outer member (5, 15) is transparent or semitransparent and the inner member (4, 14) is colored in a color different from that of the outer member (5, 15), characters and decorative patterns formed on the inner member (4, 14) can be visually recognized and can exercise a decorative effect.
When the inside surface of the outer member (5) is glossy, the inner member (4) and characters and decorative patterns formed on the inner member (4) can be easily seen through the outer member (5).
When the inner member (4, 14) and the outer member (5, 15) are made of materials of different hardnesses, respectively, the inner member (4, 14) is made of a soft material having a low hardness, and the outer member (5, 15) is made of a soft material having a high hardness, the outer member (5, 15) made of the soft material having a high hardness which is resistant to swelling due to aging, the possibility that the outer member (5, 15) comes off the inner member (4, 14) due to swelling can be reduced.
When the inside diameter of the outer member (5, 15) is greater than the outside diameter of the inner member (4, 14), and the outer member (5, 15) is axially compressed when put on the grip part (3) of the barrel body (2), the outer member (5, 15) having the inside diameter smaller than the outside diameter of the inner member (4, 14) can be easily put on the inner member (4, 14). Since the outer member (5, 15) is axially compressed when the outer member (5, 15) is put on the gripping part (3) of the barrel body (2), the outer member (5, 15) is difficult to be displaced when a force is exerted thereon when the writing implement is used for writing.
When the outer member (15) is provided with the radially inwardly extending protrusion (20) at the front end thereof and the back end surface (20a) of the protrusion (20) is in contact with the front end surface (14a) of the inner member (14), the front end of a large area of the outer member (15) is in contact with the front end of the inner member (14). Therefore, the outer member (15) is resistant to displacement and the radially inwardly extending protrusion exercises an improved effect on preventing the displacement of the outer member (15).
Forming the part of the outer member (5, 15) corresponding to the inner member (4, 14) in a mean wall thickness between 1 and 5 mm is more effective in suppressing the deformation of the outer member (5, 15) than forming the outer member (5, 15) in a wall thickness below 1 mm, facilitates putting the outer member (5, 15) on the inner member (4, 14) and makes the outer member (5, 15) to restore its original state after the outer member (5, 15) is deformed and brought into close contact with the inner member (4, 14). Forming the part of the outer member (5, 15) corresponding to the inner member (4, 14) in a mean wall thickness between 1 and 5 mm is more effective in making the hardness and the color of the inner member (4, 14) effective than forming the outer member (5, 15) in a wall thickness above 5 mm.
The soft material may be chosen from generally known elastic materials for forming the grip members (G, G′) of writing implements including elastically deformable silicone rubber, natural rubber, isobutylene-isoprene rubber, fluorocarbon rubber, vinyl chloride resins, butadiene rubber, urethane rubber, polyethylene resins, synthetic rubbers and thermoplastic elastomers. The soft materials respectively having different hardnesses may be one and the same soft materials or different soft materials.
Effect of the invention
The present invention provides the barrel for a writing implement, provided with the layered grip member that can be formed by easily assembling the inner member and the outer member.
Preferred embodiments of the present invention will be described with reference to the accompanying drawings, in which like or corresponding members and the same parts are designated by the same reference characters.
Referring to
Fine protrusions and depressions (assembly facilitating shapes) are formed in the outside surface 4b of the inner member 4 and the inside surface 5b of the outer member 5. The protrusions and depressions reduce resistance against the sliding movement of the inside surface 5b of the outer member 5 along the outside surface 4b of the inner member 4 when the outer member 5 is put on the inner member 4 to facilitate assembling the inner member 4 and the outer member 5. Even if the outer member 5 is deformed and the inside surface 5b of the outer member 5 is brought into close contact with the outside surface 4b of the inner member 4 by pressure exerted on the outer member 5 when the writing implement is used for writing, the outer member 5 can easily restore its original state because the outer member 5 is made of the elastically deformable, soft material and the protrusions and depressions facilitate the flow of air into the gap between the inner member 4 and the outer member 5. Although there are not any restrictions on a method of forming the protrusions and depressions and the shapes of the protrusions and depressions, it is preferable that fine protrusions and fine depressions are formed in the outside surface 4b of the inner member 4 and the inside surface 5b of the outer member 5 by, for example, satin finish.
The outer member 5 can be easily put on the inner member 4 by forming the outside surface 4b of the inner member 4 and the inside surface 5b of the outer member 5 in tapered surfaces tapering toward the front ends, respectively (assembly facilitating shapes). When the outside surface 4b of the inner member 4 and the inside surface 5b of the outer member 5 are thus tapered, the outside diameters of the front and the back end of the inner member 4 are m and n, where m<n, and the inside diameters of the front and the back end of the outer member 5 are M and N, where M<N.
The soft materials forming the grip member G absorb moisture and oil considerably and swell and the outside diameter of the inner member 4 and the inside diameter of the outer member 5 increase with time. Consequently, the grip member G tends to move axially when the grip member G is pushed forward by force when the writing implement is used for writing and, when things come to the worst, the outer member 5 comes off the barrel body 2. It is possible to make the outer member 5 difficult to be displaced even if force acts on a front part of the barrel 1 when the writing implement is used for writing by forming the outside surface 4b of the inner member 4 and the inside surface 5b of the outer member 5 in tapered surfaces tapering toward the front and increasing the wall thickness K of a front part contiguous with the front end 5a of the outer member 5 in contact with the barrel cap 6.
The outer member 5 can be easily put on the inner member 4 and the outer member 5 has difficulty in coming in close contact with the inner member 4 if the inner member 4 and the outer member 5 are formed such that m<M and n<N, where m and n are the outside diameters of the front and the back end of the inner member 4, and M and N are the inside diameters of the front and the back end of the outer member 5. In view of dimensional accuracy dependent on forming conditions, it is desirable that the inside diameter of a part of the outer member 5 is greater than the outside diameter of a part of the inner member 4 corresponding to the part of the outer member 5 by about 0.05 mm.
A barrel 11 in a second embodiment according to the present invention for a writing implement shown in
Since the front end surface 14a of the inner member 14 is in contact with the back end surface 20a of the radially inwardly protruding annular protrusion 20 of the outer member 15 in an increased contact area, the displacement of the outer member 15 can be effectively prevented by an increased resistance. Since the front end part of the outer member 15 provided with the annular protrusion 20 has an increased wall thickness K′, the inside diameter M′ of the front end of the outer layer 15 will hardly become greater than the outside diameter of the back end of a barrel cap 6 even if the inner member 14 and the outer layer 15 swell with time and hence the outer member 15 will not be displaced.
The outside surface 14b of the inner member 14 and the inside surface 15b of the outer member 15, similarly to those of the barrel 1 in the first embodiment, are tapered toward the front (formed in assembly facilitating shapes) such that the outside diameters of the front and the back end of the inner member 14 are m′ and n′, and the inside diameters of the front and the back end of the outer member 15 are M′ and N′, where m′<M′, n′<N′. Thus the outer member 15 can be easily put on the inner member 14.
A barrel 1 in a third embodiment according to the present invention will be described, in which parts like or corresponding to those of the barrel 1 in the first embodiment are denoted by the same reference characters and the description thereof will be omitted.
The barrel 1 in the third embodiment is the same as the barrel 1 in the first embodiment and differs from the latter only in the following respects.
Referring to
A barrel 1 in a fourth embodiment according to the present invention will be described, in which parts like or corresponding to those of the barrel 1 in the third embodiment are denoted by the same reference characters and the description thereof will be omitted.
The barrel 1 in the fourth embodiment is the same as the barrel 1 in the third embodiment and differs from the latter only in the following respects.
Referring to
A barrel 1 in a fifth embodiment according to the present invention will be described, in which parts like or corresponding to those of the barrel 1 in the first embodiment are denoted by the same reference characters and the description thereof will be omitted.
The barrel 1 in the fifth embodiment is the same as the barrel 1 in the first embodiment and differs from the latter only in the following respects.
Referring to
A barrel 1 in a sixth embodiment according to the present invention will be described, in which parts like or corresponding to those of the barrel 1 in the first embodiment are denoted by the same reference characters and the description thereof will be omitted.
The barrel 1 in the fifth embodiment is the same as the barrel 1 in the first embodiment and differs from the latter only in the following respects.
Referring to
Characters to be printed on the outside surface 4b of the inner member 4 are not limited to those indicating the customer's name, but may be characters indicating a trade name, or a maker's name, a design or a decorative pattern. The outer member 5 may be semitransparent. The inner member 4 may be semitransparent or transparent. The inner member 4 and the characters printed on the inner member 4 can be easily recognized when the inside surface of the outer member 5 is glossy and the outside surface of the inner member 4 is satin-finished.
Modifications
Although the present invention has been described in its preferred embodiments, obviously many changes and variations are possible therein without departing from the scope of the present invention. Possible modifications will be described below.
Although the grip member of the present invention may be colored in any colors, it is preferable to form the inner and the outer member in different colors, respectively, for an improved decorative effect.
Although the inner and the outer member may be formed in any suitable hardnesses, respectively, it is desirable to make the inner member of a soft material having a low hardness because soft materials having a Shore hardness of Hs40 or below are likely to swell with time.
In each of the foregoing embodiments, the inner and the outer members are formed separately, the inner member is put on the gripping part of the barrel body, and then the outer member is put on the inner member. The inner and the outer member may be integrally formed by a two-color injection molding method. Another member may be disposed on the gripping part so as to underlie the inner member.
According to the present invention, the inner member is covered with the outer member. The outer member may be put on the inner member put on the barrel body or the grip member formed by assembling the inner and the outer member may be put on the barrel body, provided that the corresponding surfaces of the inner and the outer member are not fused or bonded together and the inner member is covered with the outer member. The inner and the outer member may be fused or bonded together so that the outside surface of the inner member and the inside surface of the outer member may not be affected after covering the inner member with the outer member. However, it is preferable to put the outer member detachably on the inner member to enable the replacement of the outer member with another outer member of a color and a soft material having a hardness desired by the user.
Although there are not any particular restrictions on the respective wall thicknesses of the inner and the outer member, the outer member deforms easily, is difficult to put on the inner member and cannot easily restore its original state when the outer member is brought into close contact with the inner member if the wall thickness of the outer member is below 1 mm. Preferably, the mean wall thickness of the outer member is between 1 and 5 mm because the effects of the inner member including the hardness and the color become ineffective when the wall thickness of the outer member is greater than 5 mm. The man wall thickness of the outer member is the mean of wall thicknesses of parts of the outer member corresponding to the inner member.
The axial grooves 31 and 41 of the barrels in the third and the fourth embodiment may be replaced with axial ridges rising from the outside surfaces 4b.
Each of the grip members G and G′ of the barrels in the first and the second embodiment is provided with two types of assembly facilitating shapes, namely, the tapered surface, and the protrusions and depressions. Each of the grip members G and G′ may be provided with only either of the two types of assembly facilitating shapes.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2003-182020 | Jun 2003 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP04/08448 | 6/16/2004 | WO | 12/23/2005 |
