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US 3,937,906 AGranted
Telephone hook switch comprising separately operable contact groups
AssigneeNippon Electric Co., Ltd.
InventorKeizou Ohta
Life of this patent
Estimating the term…
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AssigneeNippon Electric Co., Ltd.
InventorKeizou Ohta
Estimating the term…
A telephone hook switch is manufactured by first molding a moldable insulating material into two block portions and an integral bridge. The block portions have a common back surface, adjacent parallel side surfaces having opposed and aligned back edges interconnected by the bridge, a pair of pivot members aligned on a plane perpendicular to the side surfaces and equally spaced therefrom, and slots formed in the respective block portions parallel to the side surfaces and spaced from the pivot members. The bridge has a thin portion bisecting the distance between the side surfaces. Contact members of the switch are snugly placed in predetermined ones of the slots and one of the block portions is folded at the thin portion of the bridge towards the other with the back surfaces of the respective block portions brought into substantial contact with each other. A lever member of the switch is mounted on the pivot members.
In a telephone hook switch including a plurality of contact members, a frame member having a pair of axially aligned pivot members outwardly extended from said frame member and having means for supporting said contact members enclosed within said frame member and positioned on both sides of said pivot members common axis, and a lever member pivotally mounted on said pivot members for positively moving predetermined ones of said contact members into and out of contact with predetermined other ones of said contact members, the improvement wherein said frame member comprises two initially non-contacting block portions, each having a back surface, one of said pivot members disposed on each said back surface, a first side surface disposed perpendicular to said back surface on one side of said pivot member axis, and a second side surface spaced a predetermined amount from said first side surface and disposed on the other side of said pivot member axis, the back surfaces of both said block portions being brought into substantial contact with each other with the first and second side surfaces of one of said block portions being coextensive with the respective first and second side surfaces of the other of said block portions.
A block member for a frame member of a telephone hook switch comprising a plurality of contact members supported by said frame member and a lever member pivotally mounted on said frame member for positively moving predetermined ones of said contact members to make and break contacts afforded by said contact members, which comprises two block portions and an integral bridge, said blocks having a common back surface, first side surfaces interconnected by said bridge and disposed parallel to each other and perpendicular to said back surface, second side surfaces spaced a predetermined distance from respective first side surfaces, a pair of pivot members aligned on a plane perpendicular to said back and side surfaces and spaced a predetermined amount from said first side surfaces for pivotal mounting thereon of said lever member, and means extending between said first and second side surfaces of the respective block portions and spaced from said plane for snugly receiving said contact members, said predetermined amount being smaller than said predetermined distance, said bridge having a thin portion of a predetermined thickness extending along a line bisecting the distance between said first side surfaces.
Dependencies are inferred from the claim text.