A binding tool for documents or the like is provided which is capable of suppressing the height of protruded portions from a surface of a base portion thereby to expand a space thereabove, and which is also easy to manufacture and assemble. The binding tool includes a base portion (2) formed of a me
A binding tool for documents or the like is provided which is capable of suppressing the height of protruded portions from a surface of a base portion thereby to expand a space thereabove, and which is also easy to manufacture and assemble. The binding tool includes a base portion (2) formed of a metal plate, rings (3) that are each mounted on the base portion so as to be selectively changed into a closed ring posture to bind documents or the like and an opened ring posture to open a part of a closed ring for insertion of the documents or the like, and a switching mechanism (5) that is mounted on the base portion and includes a switching lever (4) for switching the rings between the closed ring posture and the opened ring posture. The switching lever has a base end (41) and a free end (42), and a cam member (6) is provided on the base end of the switching member for adjusting the degree of opening/closing of each of the rings according to a rotated position of the free end. The cam member has a cam main body (61) and camshafts (62) that protrude from the cam main body, and bearing portions (25) are formed in the base portion. The bearing portions are each formed of an inner surface of a curved portion where a part of the base portion is curved to a front surface side thereof.
대표청구항▼
What is claimed is: 1. A binding tool for documents or the like, comprising: a base portion that is formed of a metal plate; rings that are each mounted on said base portion so as to be selectively changed into a closed ring posture to bind documents or the like and an opened ring posture to open a
What is claimed is: 1. A binding tool for documents or the like, comprising: a base portion that is formed of a metal plate; rings that are each mounted on said base portion so as to be selectively changed into a closed ring posture to bind documents or the like and an opened ring posture to open a part of a closed ring for insertion of the documents or the like; and a switching mechanism that is mounted on said base portion and includes a switching lever for switching said rings between said closed ring posture and said opened ring posture; wherein said switching lever has a base end and a free end, and a cam member is provided on said base end of said switching member for adjusting the degree of opening/closing of each of said individual rings according to a rotated position of said free end of said switching lever; said cam member has a cam main body and a pair of camshafts that protrude from opposite side surfaces of said cam main body; said base portion is formed with a pair of bearing portions spaced apart and opposing each other with the cam member disposed therebetween, each camshaft engaging a respective one of said bearing portions, and said bearing portions are each formed of an inner surface of a curved portion where a part of said base portion is curved to a front surface side thereof; wherein said bearing portions each has a substantially semicircular shape in cross-section, with an open side of the semicircular shape directed toward a rear surface side of said base portion; said pair of bearing portions defining edges that oppose each other, and the base portion defining an opening disposed between said edges of the bearing portions; said cam main body having side surfaces, each side surface being provided with a contact portion having an inner surface portion of substantially semi-circular shape in cross-section, which has a radius larger than a radius of an outer surface of said bearing portion that opposes said inner surface portion; said inner surface portions of the contact portions being substantially in contact with the outer surfaces of the respective bearing portions when the rings are in the closed ring posture, and said contact portions preventing the camshafts from being downwardly displaced from the bearing portions during shifting from the closed ring posture to the open ring posture. 2. The binding tool for documents or the like as set forth in claim 1, wherein said base portion has a base main body and side piece portions at opposite sides thereof, which are formed by processing a metal plate in such a manner that said base main body forms a front surface of said base portion, and said side piece portions are bent in such a form as to incline toward a rear surface side of said base main body so as to form side surfaces of said base portion, and said bearing portions are formed on said base main body. 3. The binding tool for documents or the like as set forth in claim 1, wherein said bearing portions of said base main body have surfaces formed into sloped surfaces that incline downwardly toward the side piece portions, respectively, of said base portion. 4. The binding tool for documents or the like as set forth in claim 1, wherein said cam main body and said camshafts of said cam member are formed of synthetic resin in a mutually integrated manner. 5. The binding tool for documents or the like as set forth in claim 1, wherein said rings are arranged at intervals in a longitudinal direction of said base portion, and said switching mechanism is set in such a manner that when said rings are each in their opened ring posture, said switching lever is able to pass an opened portion of each ring. 6. The binding tool for documents or the like as set forth in claim 1, wherein said base portion is further formed with a groove-shaped concave portion in which a part of said switching lever is received when said rings are each in said closed ring posture. 7. The binding tool for documents or the like as set forth in claim 1, wherein each of said rings has a first ring member and a second ring member which can take a closed ring posture with their tip ends being in contact with each other and an opened ring posture with their tip ends being apart from each other; said switching mechanism has two support members that are arranged side by side in said base portion, and are each tiltable to a side orthogonal to the longitudinal direction of said base portion; said first ring member is supported by one of said support members, whereas said second ring member is supported by the other support member; and a spring member for urging said support members in a direction to move the tip ends of said ring members away from each other is provided between at least one of said support members and a side piece portion of said base portion. 8. The binding tool for documents or the like as set forth in claim 1, wherein the edges of the bearing portions protrude toward the opening in the base portion. 9. A binding tool for documents or the like, comprising: a base portion that is formed of a metal plate; rings that are each mounted on said base portion so as to be selectively changed into a closed ring posture to bind documents or the like and an opened ring posture to open a part of a closed ring for insertion of the documents or the like; and a switching mechanism that is mounted on said base portion and includes a switching lever for switching said rings between said closed ring posture and said opened ring posture; wherein said switching lever has a base end and a free end, and a cam member is provided on said base end of said switching member for adjusting the degree of opening/closing of each of said individual rings according to a rotated position of said free end of said switching lever; said cam member has a cam main body and a pair of camshafts that protrude from opposite side surfaces of said cam main body; said base portion is formed with a pair of bearing portions spaced apart and opposing each other with the cam member disposed therebetween, each camshaft engaging a respective one of said bearing portions, and said bearing portions are each formed of an inner surface of a curved portion where a part of said base portion is curved to a front surface side thereof; wherein said bearing portions each has a substantially semicircular shape in cross-section, with an open side of the semicircular shape directed toward a rear surface side of said base portion, and said bearing portions are further provided with biasing means for always biasing the camshafts toward the bearing portions; said pair of bearing portions defining edges that oppose each other, and the base portion defining an opening disposed between said edges of the bearing portions; said cam main body having side surfaces, each side surface being provided with a contact portion having an inner surface portion which has a radius larger than a radius of an outer surface of said bearing portion that opposes said inner surface portion; said contact portions preventing the camshafts from being downwardly displaced from the bearing portions during shifting from the closed ring posture to the open ring posture.
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이 특허에 인용된 특허 (5)
Snyder Michael Thom ; McKeown Timothy Edward ; Monson R. Hal ; Little David, Binder mechanism.
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