JP2011209276A5

JP2011209276A5 -

Info

Publication number: JP2011209276A5
Application number: JP2011041018A
Authority: JP
Filing date: 2011-02-27
Publication date: 2014-02-27
Anticipated expiration: 2031-02-27

Claims

A fallen body with a reflector,
Holding and releasing means for the falling body,
The optical center of the reflecting mirror is matched with the center of gravity of the whole falling body including the reflecting mirror,
The holding / removing means includes a plurality of contacts that can be displaced in the lateral direction, and the plurality of contacts are caused by a force in a direction connecting each contact point and the center of gravity at a contact point between each contact and the falling body. The falling body is held in an initial state, and the plurality of contacts that are in contact with the falling body at the plurality of points are simultaneously displaced in a direction away from the falling body, so that the falling body is detached from the initial state and freely dropped. A free fall device used for gravimeters.

2. The free fall device according to claim 1, wherein the plurality of contacts hold the fallen body in an initial state by contacting the fallen body at a plurality of points on a plane passing through the center of gravity.

The free fall device according to claim 1, wherein a displacement direction of each contact is on a straight line passing through the center of gravity and each contact point.

The plurality of contacts can be displaced in the horizontal direction;
The plurality of contacts are in contact with the falling body in the initial state by contacting the falling body side surface in a horizontal direction at a plurality of points on a horizontal plane passing through the center of gravity, and are in contact with the falling body at the plurality of points. To disengage the fallen body from the initial state by simultaneously displacing it horizontally away from the fallen body.
The free fall device according to any one of claims 1 to 3.

The free fall device according to any one of claims 1 to 4, wherein a time during which each contact of the holding / removing means is displaced in a direction away from the falling body is 1.0 ms or less.

The free fall device according to any one of claims 1 to 5, wherein each contact of the holding / removing means is displaced by expansion and contraction of a piezo element.

The free fall device is:
A receiving part for receiving a fallen body that has fallen off the initial state;
A moving mechanism for returning the fallen body received by the receiving portion to the initial state;
With
The falling body comprises a cylindrical case having an opening at least at the lower end, and a drop mirror provided in the case,
A protruding edge is formed on the outer peripheral surface of the case over the entire circumference, the protruding edge is positioned on a plane passing through the center of gravity, and the contact is a peripheral surface of the protruding edge. To come into contact with
The falling body that falls freely is received in contact with the receiving portion at a portion other than the peripheral surface of the protruding portion of the falling body.
The free fall device according to any one of claims 1 to 6.

The return mechanism includes a lift that can be raised and lowered, and a moving mechanism that raises and lowers the lift between a lower position and an upper position.
The lifting platform includes a falling body set pedestal that is inserted into the falling body case from the lower end of the case, and an arm that is provided with the falling body set pedestal on the distal end side and is connected to the moving mechanism on the base end side. ,
When the falling body is in an initial state, the lifting platform is in a lower position, and the falling body set base is in a standby position in the receiving portion,
When the fallen body falls freely and is received by the receiving part, the lifting platform is raised by the moving mechanism, so that the fallen body set pedestal is inserted into the fallen body case from the lower end and is in contact with the fallen body from below The holding / removing means holds the falling body in the initial state,
After holding the fallen body in the initial state, the lifting platform is lowered to a lower position by the moving mechanism and becomes a standby posture.
The free fall device according to claim 7.