Focusing device in a center focusing type binocular

Claim 2

A focusing device in a center focusing type binocular having a first body tube and a second body tube for vision adjustment interconnected so that at least one of the body tubes is pivotable about an axis between the tubes, and lens frames holding ocular systems and mounted for sliding along optical axes within the respective body tubes, said focusing device comprising: a stationary main shaft the central axis of which is coincident with the pivot axis between said tubes; rotatable focusing means including an externally threaded ring and a knob member, said focusing means being rotatably fitted on said stationary main shaft along a portion of its length; tube means having internal threads in mesh with the externally threaded ring of said focusing means, said tube means having axially elongated slots formed substantially centrally of its length, and a flange at one end thereof; a pivot sleeve positioned around said tube means; a pin extending laterally through said main shaft and through said slots in said tube means and secured to said pivot sleeve; ring means including a slotted flange and an externally threaded shank portion, said ring means being rotatably and slidably fitted on said stationary main shaft along the other portion of its length, said ring means being screwed into the internally threaded portion of said tube means; an ocular system in each of said body tubes and shiftable longitudinally relatively to said main shaft upon rotation of said focusing knob; and means connecting one ocular system with said tube means and the other ocular system with said ring means for shifting said ocular systems upon rotation of said focusing knob.

Claim 3

A focusing device according to claim 1, wherein a vision adjusting knob is rotatably mounted at the end of said main shaft remote from said focusing knob and includes a pin extending through the slot in said ring means and a knob member, whereby rotation of said knob member and pin effects rotation of said ring means and independent longitudinal shifting of the respective connecting means and said other ocular system in one of said body tubes to correct for the vision difference between the eyes of a viewer.

Claim 4

A focusing device in a center focusing type binocular having a first body tube and a second body tube for vision adjustment interconnected so that at least one of the body tubes is pivotable about an axis between the tubes, and lens frames holding ocular systems and mounted for sliding along optical axes within the respective body tubes, said focusing device comprising: a stationary main shaft the central axis of which is coincident with the pivot axis between said tubes; rotatable focusing means including an externally threaded ring and a knob member, said focusing means being rotatably fitted on said stationary main shaft along a portion of its length; tube means having internal threads in mesh with the externally threaded ring of said focusing means, said tube means having axially elongated slots formed substantially centrally of its length, and a flange at one end thereof; a pivot sleeve positioned around said tube means; a pin extending laterally through said main shaft and through said slots in said tube means and secured to said pivot sleeve; ring means including a slotted flange and an exterNally threaded shank portion, said ring means being rotatably and slidably fitted on said stationary main shaft along the other portion of its length, said ring means being screwed into the internally threaded portion of said tube means; a vision adjusting knob rotatably mounted at the end of said main shaft remote from said focusing means, said vision adjusting knob including a pin extending through the slot in said flange of said ring means and a knob member; said first body tube being formed with a guide groove extending axially from the end thereof adjacent to said tube means, said second body tube being formed with a guide groove extending axially from the end thereof adjacent to said ring means, both of said guide grooves being parallel to said pivot sleeve; a slidable shaft inserted into each of said grooves; sealing means interposed between each of said guide grooves and each of said slidable shafts and adjacent to the opposite ends of said first and second body tubes; said slidable shaft adjacent to said second body tube being formed with a circumferentially extending recess at one end thereof, said recess loosely receiving therein said flange of said ring means; said slidable shaft adjacent to said first body tube having one end thereof fixed to said tube means; and connected means provided between each of said slidable shafts and one of said inner lens frames.

Claim 5

A focusing device in a center focusing type binocular having a first body tube and a second body tube for vision adjustment interconnected so that at least one of the body tubes is pivotable about an axis between the tubes, and lens frames holding ocular systems and mounted for sliding along optical axes within the respective body tubes, said focusing device comprising: a stationary main shaft the central axis of which is coincident with the pivot axis between said tubes; rotatable focusing means including an externally threaded ring and a knob member, said focusing means being rotatably fitted on said stationary main shaft along a portion of its length; tube means having internal threads in mesh with the externally threaded ring of said focusing means, said tube means having axially elongated slots formed substantially centrally of its length, and a flange at one end thereof; a pivot sleeve positioned around said tube means; a pin extending laterally through said main shaft and through said slots in said tube means and secured to said pivot sleeve; ring means including a slotted flange and an exterNally threaded shank portion, said ring means being rotatably and slidably fitted on said stationary main shaft along the other portion of its length, said ring means being screwed into the internally threaded portion of said tube means; a vision adjusting knob rotatably mounted at the end of said main shaft remote from said focusing means, said vision adjusting knob including a pin extending through the slot in said flange of said ring means and a knob member; said first body tube being formed with a guide groove extending axially from the end thereof adjacent to said tube means, said second body tube being formed with a guide groove extending axially from the end thereof adjacent to said ring means, both of said guide grooves being parallel to said pivot sleeve; a slidable shaft inserted into each of said grooves; sealing means interposed between each of said guide grooves and each of said slidable shafts and adjacent to the opposite ends of said first and second body tubes; said slidable shaft adjacent to said second body tube being formed with a circumferentially extending recess at one end thereof, said recess loosely receiving therein said flange of said ring means; said slidable shaft adjacent to said first body tube having one end thereof fixed to said tube means; and connected means provided between each of said slidable shafts and one of said inner lens frames.