DE550448C - Tip storage for precision measuring devices - Google Patents

Description

GERMAN EMPIRE

ISSUED ON May 14, 1932

REICHSPATENTAMT-

PATENT LETTERING

JVi 550448 CLASS 42d-Q ^

WiIh. Lambrecht A. G. in Göttingen *)

Tip storage for precision measuring instruments

Patented in the German Empire on February 20, 1930

Especially in the modern age 'are in the field Aviation and meteorology place special demands on measuring instruments been resulting from the present. Operating conditions result. The • most important requirements are temperature independence of the bearing play and the insensitivity to vibrations of the gear parts., 'the is achieved through air-free storage.

The temperature insensitivity has gum. Objectives. To enable all parts to work perfectly at all temperatures, such that z. B. at low temperatures a jamming of the bearing does not occur. One tries to avoid this by using neck bearings, where, with a certain allowable play, a shaft can move in its direction on a pin which is supported in a larger bore. Another means of avoiding jamming is the use of similar materials for the shaft and bearing foot, whereby the changes in length as a result of temperature changes are supposed to equalize each other to the same extent at all times. But apart from the fact that very similar building materials can rarely be obtained in a simple manner, the differently large masses that are accommodated in the shaft and the bearing base stand in the way of this intention, in such a way that the two parts follow a temperature change at different speeds due to their unequal mass distribution . In most cases, however, recognized technical principles also prohibit the use of similar building materials because of the unfavorable friction conditions. In addition, a neck bearing can easily become soiled in the presence of oil and thus generate inadmissible friction. (Meteorological equipment, for example that is in the open air, is exposed to the risk of silting up.). _R '

The neck bearings do not meet the requirement of insensitivity to vibrations that existed before especially in aircraft measuring equipment. Here are point bearings or ball bearings particularly suitable. The use of ball bearings is forbidden - mostly with caution on the price and in the case of the smallest designs because of the lack of space and, above all, the accuracy. The more accurate and this is the customary design of vibration-resistant bearings today Point bearing, which in turn fails when the temperature changes as a result of the jamming. 55 ■

To remedy this deficiency, it has already been proposed to use the bearing body for to attach the tips to leaf springs.

In order to still achieve the technical advantage in such bearings that in the Adjustment no shifting of the levers on the shaft occurs, are on

*) The patent seeker stated as the inventor:

Dipl.-Ing. Dr. Ludwig Scriba in Göttingen.

Claims (2)

the leaf springs according to the invention conically designed bearing journals -adjustable in the direction of the tip axes / This means that the pretensioning, which is also generated on one side, is evenly distributed over both bearings. This fact is also a visible advantage compared to the fixed point bearings, in which the central position of the transfer gable must be monitored very carefully during the adjustment. In Fig. 1 and 2 it is now shown how a suspension of a point bearing is achieved in that the bearing foot designed as a leaf spring yields resiliently, so that a certain "preload can be given when adjusting the bearing. From Fig. Τ is to see how the intended bearing clearance can be set by tightening the bearing screws on both sides. It has also been proven through practical tests that the bearing friction remains constant up to five revolutions (corresponding to about 3 mm preload) of the bearing screws and that even with this strongest preload no damage is possible It can be seen from this that even the greatest temperature changes must remain without influence. The version shown in Fig. 2, with a modification shown in Fig Airtight device can be used to set up the storage The reason for this is that the leaf springs are attached to the inside of the housing in such a way that the shaft is installed in a dust-tight and airtight manner. Then there is the advantage, which is often decisive in the construction of equipment for aviation, that the space-wasting protective cover can be dispensed with, the required airtightness and dust protection being easily ensured by soldered or welded housings. At the same time, there is a significant reduction in weight. PATENTANSJEVRiiCHli: 1. Top storage for precision measuring instruments, in which as a carrier of the bearing grain for the tips serve leaf springs, characterized in that on the leaf springs conical bearing journals are adjustable in the direction of the tip axes. 2. Top storage for precision measuring instruments, in which as a carrier of the bearing body for the tips "serve leaf springs, characterized in that the leaf springs on the inside of the housing so that _{a are} secured that a dust-tight and airtight installation of the shaft is achieved. For this ι sheet of drawings -