Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1980-10-23
1982-12-28
Herrmann, Allan D.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
351242, G05G 700, A61B 312
Patent
active
043655211
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for the fine adjustment in all three directions in space of an instrument arranged on a base by means of an actuating member which can be swung to all sides for horizontal adjustment and rotated for vertical adjustment.
One such device is known (German Utility Model 18 18 245) in which the actuating member consists of a shaft which is rotatable for the vertical displacement of the instrument and is surrounded by a hollow handle. This handle is directly connected to a ball which is adapted to swing to all sides in the base of the instrument and via which the base rests on a support. Upon the swinging of the handle, the ball rolls on the base and thereby effects a horizontal displacement of the base. The shaft contained in the handle is turned via a turn knob which can be grasped together with the handle in one hand and transmits movement via a universal joint arranged in the ball to a spindle which vertically displaces the instrument.
This known device has the disadvantage that in any position of swing of the handle an unintended turning of the handle will effect a horizontal displacement of the base. Such unintentional turning is possible and cannot be prevented since the ball has a recess which, in every position of swing of the handle, permits the transfer of the rotation of the shaft to the spindle for displacement.
A solution is also known (German Patent No. 24 07 174) which improves the above-described device in such a manner that unintended horizontal displacement of the base is avoided. This device consists of a handle whose lower end is connected, via a universal joint, with a turnable portion of the base which is adapted to vertically adjust the instrument. This handle has an inner lever which, is coupled without play to the handle so that upon the swinging of handle around the pivot point defined by the universal joint, serves via a special support solely for the horizontal displacement of the base with respect to the base plate. The lower end of this inner lever engages a portion of the base of the instrument which lies on the base plate so that the turning of the lever does not result in an unintentional horizontal displacement of the base. This solution has the disadvantage that the base of the instrument rests flat on the part lying on the base plate and must be displaced with respect to said part for horizontal displacement. Since the friction between two surfaces must be overcome for adjustment, the forces to be expended are dependent on the load. A completely smooth displacement is possible only in case of a very accurately developed bearing surface. Such a bearing is expensive and is sensitive to the accumulation of dirt.
The same disadvantage is present in another known fine-adjustment device (German Pat. No. 12 63 347) in which a single-piece lever is provided for both the horizontal displacement and the vertical displacement. The lever is swingable to all sides in a single support place and is coupled with respect to its rotation to the support place. The lower end of this lever, in order to avoid unintended horizontal displacements upon turning of the lever, engages a part which rests on the base plate and against which the base of the instrument rests via a large surface. In this way the above-described disadvantages of a bearing surface arise.
The object of the present invention is to provide a device for the fine adjustment in all three directions in space of an instrument by means of one actuating member. It is a further object of the invention to provide a device which permits load-independent horizontal displacements which are substantially independent of dirt and/or wear of the bearing, and which is completely uncoupled from the vertical adjustment movement of the actuating member.
Starting from the known device with handle and inner lever, this objective is achieved in the manner that the lower end of the inner lever is developed as a ball foot which rests directly on the base plate and the radius of which corresponds to the distance b
REFERENCES:
patent: 2940357 (1960-06-01), Oswold
patent: 3086743 (1963-04-01), Littmann
patent: 3463579 (1969-08-01), Papritz
patent: 3937099 (1976-02-01), Koehler
Carl Zeiss-Stiftung
Herrmann Allan D.
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