Pipe joints or couplings – With casing – lining or protector – Insulated
Patent
1980-09-19
1983-02-08
Punter, William H.
Pipe joints or couplings
With casing, lining or protector
Insulated
285276, 285277, 285317, 350254, G02B 702, F16L 3900
Patent
active
043726500
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a microscope objective mount for screwing into a microscope, said microscope having a tube which rotates around the mount and is held onto the mount.
Tubes for surrounding microscope objective mounts are known, which tubes bear data on them concerning, for example, the mechanical tube length, the optimal cover glass thickness, the magnification, and the numerical aperture. Under this arrangement, with the objective screwed in it is possible at any time to rotate these inscriptions into the user's field of vision, which is particularly advantageous when there is an objective turret.
German Gebrauchsmuster No. 19 93 231 describes a device which has, in addition to a mount and a tube, ring grooves into which a spring ring fits to hold the tube, or else the tube is held in place by a screwed on cap. In this way, the objective can be screwed on or off at any time along with the attached tube.
Another approach to rotatably attaching the inscribed tube to the objective mount comprises, according to German Pat. No. 2,554,749, an elastically deformable ring provided between the tube and the mount, whereby the tube and the ring have raised areas and depressions, and the mount has a ring groove. When the tube is slid up, a force-locking connection with the ring is produced; at the same time, easy rotatability of the tube is ensured, so that unwanted loosening of the microscope objective does not occur merely by rotating the tube. Also with this arrangement the objective can be removed along with the attached tube without special auxiliary means. Particularly with classroom microscopes this presents a certain hazard, in that beginners may often inexpertly screw the objective in and out, and the objective may even be stolen.
Accordingly, the problem underlying the invention is to devise a microscope objective mount of the type initially described supra such that the microscope objective cannot be removed by an unauthorized person (for example), while nontheless the tube is rotatable without special auxiliary means.
This problem is solved according to the invention by having the tube extend approximately over the entire length of the mount, with the tube and the mount being releasably connected by a catch. In this way the rotatability of the tube is maintained, so that the data on it can be made visable. At the same time, it is ensured that the mount cannot be taken hold of and the objective screwed out, since the mount is practically completely surrounded by the rotatable tube, and the catch rotates with the tube around the mount. A tool for opening the catch is needed to release the tube from the mount. The objective cannot be screwed on or off with the tube attached.
A suitable catch connection comprises a curved (by bending), radially deformable leaf spring with a projection attached to or built into it, and with a corresponding drill hole in the tube for the purpose of accommodating said projection, whereby the leaf spring is rotatable together with the tube in a ring groove of the mount. Additional components are not needed. However, obviously other kinds of catch connections may be used, such as spring-loaded spheres, threaded sleeves, or the like. Finally, it is particularly advantageous for the catch connection to be disposed close to the screw thread for screwing on the objective. In this way the only externally identifiable part of the catch connection, namely, the drill hole in the tube, with the projection of the leaf spring pushed into said hole, is in practice covered by the objective tube or turret.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partially cutaway elevational view of a microscope objective mount illustrating one preferred embodiment of the invention.
FIG. 2 is a transverse sectional detail view corresponding to the cutaway portion of FIG. 1 illustrating an alternate embodiment of the invention.
FIG. 3 is a transverse sectional detail view of the cutaway portion of the embodiment of FIG. 1.
The drawings show two schematic cross-sections of embodiments of microscope
REFERENCES:
patent: 2075483 (1937-03-01), Trotter
patent: 3347575 (1967-10-01), Morris
patent: 4111530 (1978-09-01), Fuehrer et al.
Leitz, E., Abstract of German Utility Model #1993231, 9/5/68.
Hildebrand"Feinmechanische Bauelemente", Carl Hansen Verlag, Munich (1978), p. 592.
Bender Reinhold
Lisfeld Robert
Ernst Leitz Wetzlar GmbH
Punter William H.
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