Method and device for determining the rectilinearity of guide rails
AssigneeInventio AG
InventorErich Pfenniger
Life of this patent
Estimating the term…
Abstract
A method and a device for determining the rectilinearity of guide rails wherein a guide rail is oriented substantially parallel to a reference axis. At least one light beam is emitted along the reference axis by a light source and is detected by a light detector. When the light source or the light detector is displaced along the guide rail, warping and twisting of the guide rail can be detected as changes in the spacing between the guide rail and the reference axis.
Claims18
A method of determining whether a guide rail has a rectilinearity suitable for use in an elevator installation for moving persons or goods, comprising the steps of:
- a. prior to use in an elevator installation, orienting an elevator guide rail with a longitudinal axis substantially parallel to a reference axis;
- b. emitting at least one light beam along the reference axis from a light source;
- c. providing a light detector for detecting the light beam;
- d. displacing at least one of the light source and the light detector along an elevator car travel face of the elevator guide rail and detecting a spacing between the guide rail travel face and the reference axis at a zero position on the elevator guide rail and at a plurality of spaced apart length positions on the elevator guide rail;
- e. determining whether there is a change in the detected spacing at any of the spaced apart length positions from the detected spacing at the zero position;
- and
- f. upon determining that there is at least one change in the detected spacings, calculating on the basis of a permissible deviation in rectilinearity whether each change in the spacings is permissible or impermissible whereby the elevator guide rail can be used in an elevator installation if all the changes are permissible.
In combination an elevator guide rail and device for determining the rectilinearity of said guide rail to be used in an elevator installation for moving persons or goods, comprising:
- at least one support for supporting the elevator guide rail with a longitudinal axis substantially parallel to a reference axis;
- a light source emitting at least one light beam and being mounted on a travel face of an elevator guide rail to emit said at least one light beam along the reference axis;
- a light detector for detecting said at least one light beam and generating a detector signal, said light detector being mounted on the travel face of the elevator guide rail and at least one of said light source and said light detector being movable along the elevator guide rail;
- and
- an evaluating unit connected to said light detector for receiving said detector signal, where the elevator guide rail is mounted on said at least one support and said light source and said light detector are mounted on the travel face of the elevator guide rail, said evaluating unit calculates from said detector signal any changes in spacing between the travel face of the guide rail and the reference axis as at least one of said light source and said light detector are moved along the elevator guide rail and indicates on the basis of a permissible deviation in rectilinearity whether the changes in the spacing are permissible or impermissible.
A method of determining whether a guide rail is suitable for use in an elevator installation for moving persons or goods, comprising the steps of:
- a. processing a guide rail for use in an elevator installation;
- b. prior to use, orienting the guide rail with a longitudinal axis substantially parallel to a reference axis;
- c. emitting at least one light beam along the reference axis from a light source;
- d. providing a light detector for detecting the light beam;
- e. displacing at least one of the light source and the light detector along a travel face of the guide rail and detecting a spacing between the guide rail travel face and the reference axis at a zero position on the guide rail and at a plurality of spaced apart length positions on the guide rail;
- f. determining whether there is a change in the detected spacing at any of the spaced apart length positions from the detected spacing at the zero position;
- g. upon determining that there is at least one change in the detected spacings, calculating on the basis of a permissible deviation in rectilinearity whether each change in the spacings is permissible or impermissible whereby the elevator guide rail can be used in an elevator installation if all the changes are permissible;
- and
- h. if at least one of the changes in the spacings is impermissible, reprocessing the guide rail and repeating said steps b. trough g.
Dependencies are inferred from the claim text.