GB1596915A - Housings for enclosed length measuring devices - Google Patents
Housings for enclosed length measuring devices Download PDFInfo
- Publication number
- GB1596915A GB1596915A GB21848/78A GB2184878A GB1596915A GB 1596915 A GB1596915 A GB 1596915A GB 21848/78 A GB21848/78 A GB 21848/78A GB 2184878 A GB2184878 A GB 2184878A GB 1596915 A GB1596915 A GB 1596915A
- Authority
- GB
- United Kingdom
- Prior art keywords
- housing
- parts
- screws
- recesses
- projections
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract description 2
- 230000009191 jumping Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/002—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
- G01D5/34746—Linear encoders
- G01D5/34761—Protection devices, e.g. caps; Blowing devices
Abstract
This two-part housing (1) provided for encapsulated length-measuring instruments and in which a scanning unit (6) under spring tension is guided along a material measure (5), consists of a first housing part (1a) which is mounted on a machine component (10), for example by means of mounting screws (9) acting only on said housing part, and of a second housing part (1b) which is mounted on the first housing part (1a), for example by means of screw plugs (2). The housing parts have projections (1a', 1b') and depressions (1a'', 1b'') which interlock at their joint and which keep the two housing parts (1a, 1b) joined to one another in a self-closed fashion even after removal of the screw plugs (2), with the result that for the purpose of cleaning the device the second housing part (1b) can be removed from the first part (1a) by only one person and in so doing the scanning unit (6) under spring tension can be prevented from jumping out. A sealing cord (3) is provided between the two housing parts (1a, 1b) in the region of the self-closed joint. <IMAGE>
Description
(54) IMPROVEMENTS IN HOUSINGS FOR ENCLOSED LENGTH
MEASURING DEVICES (71) We, DR. JOHANNES HEIDENHAIN
GMBH, a joint stock company organised under the laws of the Federal Republic of
Germany, of Postfach 1260, D-8225
Traunreut, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The invention relates to a housing for an enclosed length measuring device for measuring the position of two relatively movable members, said housing being provided with means for securing it to one of the said movable members and with means for holding its two parts together.
The known enclosed length measuring devices frequently have a one-part extruded hollow member which is open at one side and which is provided with sealing lips at the open side. A measurement means and a sensing unit are arranged within the hollow member. A follower member extends outwardly through the sealing lips from the sensing unit. The ends of the hollow member are closed off by end members.
However, after t'ne assembly has been in service over a prolonged period, especially on machine tools, the measuring device may suffer from fouling. In the abovedescribed type of apparatus, the measuring device is then removed from the machine, dismantled, cleaned, and re-assembled.
When this is done, precise adjustment must then be effected. This procedure is quite complicated and results in the machine in question being out of operation for periods of time.
Measuring devices (British patent specification No. 1,442,165) are therefore known, in which the hollow member is provided with a cover which can be unscrewed so that the measurement member can be cleaned in the installed condition, and the entire system does not have to be removed
from the machine.
In the last-mentioned construction, however, the cleaning operation also requires highly qualified technicians. Generally, the sensing unit is mounted in the hollow member under a spring loading, and, when the cover is removed, a high degree of skill with the fingers is necessary to ensure that the sensing unit does not jump out of the mounting guides. Under some circumstances, it is necessary to resort to a second person or to an auxiliary device, at the moment of removing the cover, in order to prevent the spring-loaded sensing unit from jumping out.
The object of the present invention is to provide an improved housing for length measuring devices which overcomes the above-mentioned disadvantages and which makes it possible easily to clean the measurement member, without it being necessary to remove the whole measuring device from the machine.
With this object in view, there is provided according to this invention a twopart housing for an enclosed length measuring device for measuring the position of two relatively movable members, said housing being provided with means for securing it to one of the said movable members and with means for holding its two parts together, wherein the means for holding the two housing parts together are independent of the means for securing the housing to one of said members and the two parts of the two-part housing have interengaging projections and recesses such that, after the means for holding the two housing parts together have been released, the two parts of the housing will still be connected together by said projections and recesses.
The advantage of the invention is that the housing with the measuring device mounted therein can remain on the machine. The mechanic only has to loosen completely the screws or other means which hold the two parts of ;the housing together, after which these two parts will still be connected together by engagement of the projections in the recesses and the mechanic will then have both hands free to release what in practice will be the top part of the housing member from the other part of the housing and the said one of the two relatively movable members.
A sealing element is preferably disposed between adjacent surface parts of one of the projections and the corresponding recess.
An embodiment of the invention will be described in greater detail hereinafter with reference to the accompanying drawings, in which:- Figure 1 is a view in cross-section in simplified form of a housing for a length measuring device with the length measuring device mounted therein,
Figure 2 is a plan view of part of this housing, and
Figure 3 is a vertical section of the housing part shown in Figure 2.
A hollow member 1 comprises individual parts la and lb. The individual parts la and lb are fixedly connected by screws 2.
A sealing cord 3 is inserted in the region of the screw connection, over the entire length of the measuring device. At their line of separation, the two individual parts la and ib have projections 1d or lb! and recesses la" or ib" respectively, which interengage in such a way that, even when the screws 2 are released, the two individual parts la and ib are still connected together.
The two individual parts la and ib are separated only by releasing the connection between the projections la', lb' and the recesses la", lb" by moving the parts la and ib relatively to each other in a direction normal to the direction of screwing the screws. At its open side, the hollow member 1 has sealing lips 4, a respective sealing lip being mounted in each individual part la and ib. A measurement member 5, herein the form of a glass measurement scale, is secured in the interior of the hollow member 1, in known manner. The measurement member 5 is sensed by a sensing unit 6 which is shown only in diagrammatic form.The sensing unit 6 is guided along inside surfaces of the hollow member 1 and the measurement member 5 by means of rollers 7. A follower member 8 is connected to the sensing unit 6 and extends outwardly between the sealing lips 4. The hollow member 1 is secured to a component 10 of the machine by fixing screws 9.
Figure 2 shows a plan view of a part of the length measuring device. Only a broken-away part of the hollow member 1 is illustrated. Figure 2 shows the screws 2 which connect the two individual parts la and 1 b of the hollow member together.
Provided in the visible top part la are recesses 11 which are open at one side and in which the heads of the fixing screws 9 are received. After the screws 2 are released, the top part la can now be separated from the bottom part 1 b, which remains secured in position, by movement of the top part la in the direction indicated by the arrow.
The Figure 3 side view of a broken-away part of the length measuring device is partly in cross-section. The fixing screws 9 secure the part 1b which is provided with through holes 12, together with the part la which is fixedly connected to the part lb to the machine component 10. The closure screws 2 provide for a fixed connection between the individual parts la and lb.
WHAT WE CLAIM IS:- 1. A two-part housing for an enclosed length measuring device for measuring the position of two relatively movable members, said housing being provided with means for securing it to one of the said movable members and with means for holding its two parts together, wherein the means for holding the two housing parts together are independent of the means for securing the housing to one of said members and the two parts of the two-part housing have interengaging projections and recesses such that, after the means for holding the two housing parts together have been released, the two parts of the housing will still be connected together by said projections and recesses.
2. A two-part housing according to claim 1, wherein a sealing element is disposed ;between adjacent surface parts of one of the projections and the corresponding recess.
3. A two-part housing according to claim
1, wherein the means for holding the two housing parts together are countersunk head screws.
4. A two-part housing according to claim 1, wherein the means for securing the housing to one of said movable members comprises fixing screws having shank portions extending freely through respective plain bores in one housing part and heads
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (5)
1. A two-part housing for an enclosed length measuring device for measuring the position of two relatively movable members, said housing being provided with means for securing it to one of the said movable members and with means for holding its two parts together, wherein the means for holding the two housing parts together are independent of the means for securing the housing to one of said members and the two parts of the two-part housing have interengaging projections and recesses such that, after the means for holding the two housing parts together have been released, the two parts of the housing will still be connected together by said projections and recesses.
2. A two-part housing according to claim 1, wherein a sealing element is disposed ;between adjacent surface parts of one of the projections and the corresponding recess.
3. A two-part housing according to claim
1, wherein the means for holding the two housing parts together are countersunk head screws.
4. A two-part housing according to claim 1, wherein the means for securing the housing to one of said movable members comprises fixing screws having shank portions extending freely through respective plain bores in one housing part and heads
located in recesses in the other housing part, the arrangement being such that, after the means for holding the two housing parts together have been disengaged and the fixing screws have been loosened, the heads of the fixing screws are slidable on said recesses exclusively in a direction at right angles to the central axes of the fixing screws and in the direction of relative movement of said movable members when they are mounted on said housing, so as to permit said two housing parts to be disconnected by withdrawal of said projections from said recesses.
5. A two-part housing substantially as described hereinbefore with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2729708A DE2729708C2 (en) | 1977-07-01 | 1977-07-01 | Two-part housing profile for length measuring devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1596915A true GB1596915A (en) | 1981-09-03 |
Family
ID=6012876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21848/78A Expired GB1596915A (en) | 1977-07-01 | 1978-05-24 | Housings for enclosed length measuring devices |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5845647B2 (en) |
| AT (1) | AT382964B (en) |
| CH (1) | CH630172A5 (en) |
| DE (1) | DE2729708C2 (en) |
| FR (1) | FR2396268A1 (en) |
| GB (1) | GB1596915A (en) |
| IT (1) | IT1161674B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106643395A (en) * | 2016-12-30 | 2017-05-10 | 湖南飞沃新能源科技股份有限公司 | Full-automatic detection device for pre-buried thread sleeve |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4500097A (en) * | 1983-01-27 | 1985-02-19 | Mitutoyo Mfg. Co., Ltd. | Seal device in displacement measuring instrument |
| JPS6038560U (en) * | 1983-08-26 | 1985-03-16 | 不二サッシ株式会社 | Condensation water drainage system for skylight glass in glass greenhouse |
| US4586760A (en) * | 1984-06-01 | 1986-05-06 | Bausch & Lomb Incorporated | Measuring scale casing and mounting spar |
| EP0219101B1 (en) * | 1985-10-16 | 1992-12-30 | Konica Corporation | Silver halide photographic material |
| JPS6299963U (en) * | 1985-12-17 | 1987-06-25 | ||
| EP4109046A1 (en) | 2021-06-21 | 2022-12-28 | Dr. Johannes Heidenhain GmbH | Position measuring device |
| EP4109047A1 (en) | 2021-06-21 | 2022-12-28 | Dr. Johannes Heidenhain GmbH | Driver for position measurement |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3816002A (en) * | 1972-10-10 | 1974-06-11 | H Wieg | Apparatus for measuring displacement between two relatively movable members |
| US3816003A (en) * | 1973-03-12 | 1974-06-11 | Dynamics Res Corp | Sealed linear encoder |
| ES208286Y (en) * | 1974-12-03 | 1976-07-16 | Carreno Mallofre | CASE FOR MEASURING INSTRUMENTS. |
| DE2643304B2 (en) * | 1976-09-25 | 1980-01-31 | Fagor Electrotecnica, Sdad.Coop., Mondragon, Guipuzcoa (Spanien) | Photoelectric device for measuring the relative position of objects |
-
1977
- 1977-07-01 DE DE2729708A patent/DE2729708C2/en not_active Expired
-
1978
- 1978-05-19 CH CH543778A patent/CH630172A5/en not_active IP Right Cessation
- 1978-05-24 GB GB21848/78A patent/GB1596915A/en not_active Expired
- 1978-06-08 AT AT0416578A patent/AT382964B/en not_active IP Right Cessation
- 1978-06-27 IT IT12680/78A patent/IT1161674B/en active
- 1978-06-30 JP JP53078777A patent/JPS5845647B2/en not_active Expired
- 1978-06-30 FR FR7819738A patent/FR2396268A1/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106643395A (en) * | 2016-12-30 | 2017-05-10 | 湖南飞沃新能源科技股份有限公司 | Full-automatic detection device for pre-buried thread sleeve |
| CN106643395B (en) * | 2016-12-30 | 2019-02-12 | 湖南飞沃新能源科技股份有限公司 | A kind of built-in turnbuckle full-automatic detection apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5845647B2 (en) | 1983-10-12 |
| ATA416578A (en) | 1986-09-15 |
| DE2729708B1 (en) | 1978-06-08 |
| FR2396268A1 (en) | 1979-01-26 |
| DE2729708C2 (en) | 1979-02-08 |
| AT382964B (en) | 1987-05-11 |
| JPS5419772A (en) | 1979-02-14 |
| FR2396268B1 (en) | 1982-12-10 |
| IT7812680A0 (en) | 1978-06-27 |
| CH630172A5 (en) | 1982-05-28 |
| IT1161674B (en) | 1987-03-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |