Geometrical instruments – Straight-line light ray type – Multisight line
Patent
1996-10-04
1998-02-10
DePumpo, Daniel G.
Geometrical instruments
Straight-line light ray type
Multisight line
33246, 33334, F41G 132
Patent
active
057156077
DESCRIPTION:
BRIEF SUMMARY
This is a International application PCT/96EP/00609, with an International Filing Date of Feb. 13, 1996.
This invention relates to a telescopic sight having adjusting spindles disposed at an angle to each other, engaging in a thread on the main tube and acting upon an inner tube having the graticule and being movably mounted within the main tube, and a light source disposed on the inner tube in the area of the graticule and adapted to be connected to a current source for illuminating the graticule.
Such a telescopic sight is known (U.S. Pat. No. 2,909,838). The graticule is formed by cross hairs comprising two electrically heatable wires which can be made to glow. The cross hairs are fastened for this purpose to a sheath which is electrically insulated by insulating material from the inner tube. The sheath comprises two halves electrically insulated from each other and connected to a battery by lines not shown in detail. Since the wires expand when heated, they must be tensed with springs. Although the thin wires are made of a platinum-iridium alloy, they are exposed to fast oxidation at the high glowing temperature.
According to DD 249 546 A1 a radioactive illuminant is used for the illuminating device of a telescopic sight. Radioactive illuminants are inadmissible for civil applications. Furthermore their brightness is too low for illuminating the graticule properly.
According to EP 0 595 315 A1 a light source is provided in a sheath-shaped adjusting spindle of the telescopic sight, its light falling through a bore onto an optical fiber forming the sighting point of the graticule. This known illuminable telescopic sight has proven useful on the whole. A disadvantage, however, is that the graticule must be disposed at the same level axially as the threaded spindle. The brightness of the illumination also leaves something to be desired, especially since the sighting point and not the crossbars of the graticule are illuminated.
The problem of the invention is therefore to provide a telescopic sight having a well illuminated graticule and a simple current supply from outside without any need to make any essential changes in the telescopic sight.
This is obtained according to the invention with the telescopic sight characterized in the claims. The subclaims state advantageous embodiments of the invention.
According to the invention the light source is fastened to the inner tube in the area of the graticule. This causes the graticule to be brightly illuminated. It further permits the graticule to be disposed at any place in the longitudinal direction of the telescopic sight. Current is supplied to the light source via one of the two adjusting spindles used for adjusting the graticule. The adjusting spindle in question preferably has for this purpose an inside part and a ring part disposed around the inside part and electrically insulated from the inside part, the thread with which the adjusting spindle engages in the thread on the main tube being fastened to the ring part. The inside part connects the light source with one pole of the current source, and the ring part with the other pole thereof.
The inside part and the ring part of the adjusting spindle are preferably connected to the light source on the inner tube for one pole of the light source by a line disposed on the inner tube and having a contact piece acted upon by the inside part of the adjusting spindle. In contrast, the ring part of the adjusting spindle is connected by a flexible line, for example by plate and/or spiral springs, with the other pole of the light source, which is preferably formed by a light-emitting diode.
The current source, generally a battery, is preferably housed together with a potentiometer in a detachable fixture on the telescopic sight. The fixture can for example be screwed onto the thread used for screwing on the protective cap for the adjusting spindle. The fixture is for this purpose preferably connected with the inside part or the ring part of the adjusting spindle via contact springs.
The fixture can be carried by the
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DePumpo Daniel G.
Swarovski Optik KG
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