Cutting by use of rotating axially moving tool – Processes – Bit detachable
Reexamination Certificate
1999-10-25
2001-06-12
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Processes
Bit detachable
C408S103000, C408S11500B
Reexamination Certificate
active
06244792
ABSTRACT:
TECHNICAL FIELD
The invention relates to a jig used for drilling a closed-end hole in an edged face of a spectacle lens to extend inside the spectacle lens, a manufacture jig for manufacturing the above jig, a method of drilling a closed-end hole, extending inside a lens, in an edged face of a spectacle lens, and a spectacle lens, which are used in fabricating rimless spectacles of a combined type of the frame-component and lenses by means of which a lug portion, formed on the frame-component such as a bridge and an end piece, is inserted and secured into the closed-end hole formed in the edged face of the lens.
BACKGROUND ART
Japanese Patent Laid-open No. Hei7-230062 is known as a new type rimless spectacles. The rimless spectacles have pairs of lug portions on a bridge for joining the right and left spectacle lenses and on an end piece for joining a temple to a spectacle lens, and pairs of closed-end holes, extending inside a lens, in edged faces of the spectacle lenses in correspondence to the positions of the bridge and the end piece. The spectacle lens is joined to the bridge and the end piece by inserting a pair of the lug portions into the closed-end holes and bonding with adhesive. According to the above description of rimless spectacles, compared to conventional rimless spectacles generally called a two-point type or a three-piece type, a screw piercing from the front face of a lens to the back face in the vicinity of an end of the lens is omitted, therefore obtaining the advantage of an expansion of the effective range of vision and the like.
Conventionally, to drill a closed-end hole in an edged face of a spectacle lens to extend inside the lens, after a guide member shaped as a small part which is provided with a pair of guide holes which guide a drill as a drilling instrument of a drill press, is attached on an edged face of a lens with a double-sided adhesive tape, a technician holds the spectacle lens with his/her hand, and then inserts the drills into the respective guide holes of the guide member in sequence, to form the closed-end holes on the edged face of the lens with the guiding action of the guide hole.
However, the drilling process of the closed-end hole is carried out while the technician is holding the spectacle lens with his/her hand, so that the holding of the spectacle lens is not stable, and naturally, the spectacle lens is not stable with respect to the drill, thus experience is required to drill the closed-end hole with accuracy. Since the number of spectacle lenses in which the closed-end holes can be formed in a fixed hour period is limited, there is the disadvantage of the increase in production cost. Additionally, the spectacle lens and, the bridge and the end-piece as components of spectacle frames which have lug portions in pairs easily have a manufacture error or a finishing error. Therefore, the drilling operation for the spectacle lens has to be carried out while taking such errors into account, so that a lot of time, experience and skill are required for the drilling operation.
It is an object of the present invention to provide a drilling jig for a spectacle lens which is capable of drilling a closed-end hole in an edged face of the spectacle lens with accuracy without experience, and increasing the number of spectacle lenses in which the closed-end holes are formed in a fixed time period.
It is another object of the present invention to provide a jig for effortlessly manufacturing the drilling jig.
It is still another object of the present invention to provide a method of drilling a spectacle lens which is capable of performing the precise drilling operation with respect to rimless spectacles of which closed-end holes are formed in the edged faces of the lenses for insertion of the holding members of spectacle-frames, and the resulting spectacle lens.
DISCLOSURE OF THE INVENTION
A drill jig for a spectacle lens according to the present invention is characterized by including a holding portion which retains a meniscus edged spectacle lens; and a guide portion which guides a drilling instrument for opening a closed-end hole, extending inside the lens, in an edged face of the spectacle lens.
According to the drill jig, since the spectacle lens is retained by the holding portion of the jig in a motionless state, an operator does not need to hold the spectacle lens itself with a hand. The processes are simplified due to the fact that the drilling operation is carried out by holding the jig with his/her hands. Additionally, since the jig is provided with the guide portion guiding the drilling instrument for drilling the closed-end holes in the edged face of the spectacle lens, the drilling operation is performed on the spectacle lens in the motionless state with precision. As a result, an accurate drilling operation without special skill is provided, and the number of spectacle lenses in which the closed-end holes are formed in a fixed hour can be increased as compared with conventional art.
The holding portion may retain the spectacle lens by force acting on an edged face as the circumferential face of the spectacle lens toward the inside of the lens, or alternatively the holding portion can retains the spectacle lens on the front face and the back face as a convex face and a concave face of the spectacle lens. The former case is preferable in order to prevent the optical face of the lens from damage.
When the holding portion is structured as described above to retain the spectacle lens by the force acting on the edged face of the spectacle lens toward the inside of the lens, the jig is provided with a plurality of support portions each of which is inclined with respect to a direction of the holding force and supports the spectacle lens. During formation, the holding force of the holding portion can act on the spectacle lens while the support portions support the spectacle lens, so that the spectacle lens is provided in the positioning state with respect to the drilling instrument guided by the guide portion to drill into the edged face of the spectacle lens.
The support portion may supports a lens corner that is formed by the edged face and an optical surface as the front face or the back face of the spectacle lens, or alternatively, the support portion can supports the front face or the back face of the spectacle lens. The front face and the back face of the spectacle lens, however, are very important parts for a spectacle lens, so that the former case is advisable.
In the drill jig according to the present invention, the support portion may be unitedly formed with the jig itself. Alternatively, the drill jig is composed of a jig body; and a plurality of support members attached to the jig body, in which the holding portion is formed in the jig body, and the support portion may be provided in the support member. In the latter, an advantage in that the jig body and the support member are respectively formed of different materials appropriate for respective functions is obtained.
Where a plurality of the support portions are formed in a plurality of the support members, the guide portion can be provided in at least one of the support members. In the formation, the support portion and the guide portion are provided in the support member, resulting in simplification of the formation of the jig body and reduction of the number of parts.
Where the guide portion is formed in the support member, a space may be formed between an end of the guide portion and the edged face of the spectacle lens. According to the formation, when the closed-end hole is formed in the edged face of the spectacle lens by the drilling instrument, cuttings produced in processing can be removal by an cuttings remove means having an air ejecting nozzle or an opening for air intake. Where the drill jig is put on the bed of the drill press and the drilling operation is carried out, a disadvantage of the displacement of the drill jig which is caused by the cuttings on the bed can be solved.
In order to retain the spectacle lens by the drill jig, the drill jig can be compose
Flynn ,Thiel, Boutell & Tanis, P.C.
Howell Daniel W.
Hoya Corporation
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