Patent US5142792A successfully refreshed from Google Patents.
US5142792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Position measuring device
Assignee: Dr Johannes Heidenhain GmbH
•
Filing: 1991-05-17
•
Granted: 1992-09-01
•
Expires: 2011-05-17
Abstract
Abstract A position measuring device for measuring the relative positions of two objects. A scanning unit for scanning a graduation carrier is mounted on a bed of a processing machine through a coupling which is stiff in measuring direction. The coupling includes a first coupling part in the form of a plate fastened to the scanning unit and a second coupling part in the form of a pin having a spherical end face. The pin is fastened to an engagement member mounted on the bed of the processing machine. A sliding layer is provided between the two coupling parts in order to eliminate wear between the two coupling parts and to eliminate measuring inaccuracies.
Inventors
- 👤 Gunther Nelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:47
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/347; G01D5/34746; G01D5/34753; Y; Y10; Y10S; Y10S33/00; Y10S33/11
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
In a position measuring device for measuring the relative positions of two objects, wherein a graduation of a graduation carrier connected to one of the objects is scanned by a scanning unit which is coupled in an articulated manner to the other of the objects through a coupling which is stiff in measuring direction, the scanning unit being slidable on an auxiliary guide means which is independent of a guide means of the two objects, and wherein the coupling includes two coupling parts which contact each other, the improvement comprising a sliding layer between the two coupling parts.
Claim 2
Dependent Claim
98 words
In a position measuring device for measuring the relative positions of two objects, wherein a graduation of a graduation carrier connected to one of the objects is scanned by a scanning unit which is coupled in an articulated manner to the other of the objects through a coupling which is stiff in measuring direction, the scanning unit being slidable on an auxiliary guide means which is independent of a guide means of the two objects, and wherein the coupling includes two coupling parts which contact each other, the improvement comprising a sliding layer between the two coupling parts.
Claim 3
Dependent Claim
25 words
The position measuring device according to claim 1, wherein the scanning unit is fastened to an engagement member which is mounted on the other object.
Claim 4
Dependent Claim
45 words
The position measuring device according to claim 2, wherein one of the two coupling parts is a plane plate fastened to the scanning unit and the other of the two coupling parts is a pin having a spherical end face fastened to the engagement member.
Claim 5
Dependent Claim
23 words
The position measuring device according to claim 3, wherein the sliding layer is a coating of the spherical end face of the pin.
Claim 6
Dependent Claim
22 words
The position measuring device according to claim 1, comprising springs for continuously holding the two coupling parts of the coupling in contact.
Claim 7
Dependent Claim
17 words
The position measuring device according to claim 1, wherein the sliding layer is of PTFE-containing plastics material.
References Cited (Backward Citations)
US3816002A
Cited
US3816003A
Cited
US3942895A
Cited
DE2611459A1
Cited
US4095903A
Cited
US4215480A
Cited
US4262423A
Cited
US4512082A
Cited
US4608758A
Cited
DD243757A1
Cited
US4982507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |