GB1349438A – Builders level
– Google Patents
GB1349438A – Builders level
– Google Patents
Builders level
Info
Publication number
GB1349438A
GB1349438A
GB5464172A
GB5464172A
GB1349438A
GB 1349438 A
GB1349438 A
GB 1349438A
GB 5464172 A
GB5464172 A
GB 5464172A
GB 5464172 A
GB5464172 A
GB 5464172A
GB 1349438 A
GB1349438 A
GB 1349438A
Authority
GB
United Kingdom
Prior art keywords
optical system
level
casing
sighting
pendulum
Prior art date
1971-12-07
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
Application number
GB5464172A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HARTLEY LW
Original Assignee
HARTLEY LW
Priority date (The priority date 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 date listed.)
1971-12-07
Filing date
1972-11-27
Publication date
1974-04-03
1972-11-27
Application filed by HARTLEY LW
filed
Critical
HARTLEY LW
1974-04-03
Publication of GB1349438A
publication
Critical
patent/GB1349438A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G02—OPTICS
G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 – G02B26/00, G02B30/00
G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
G02B27/648—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake for automatically maintaining a reference alignment, e.g. in self-levelling surveying instruments
G—PHYSICS
G01—MEASURING; TESTING
G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors’ levels
Abstract
1349438 Sighting levels L W HARTLEY and S HARTLEY 27 Nov 1972 [7 Dec 1971 25 May 1972] 54641/72 Heading G1F [Also in Division G2] A split field sighting level comprising a casing 10 having a light inlet opening 12 and an eye-piece 13 is provided with an inverting optical system 21 intercepting part of the light entering the opening whereby two images of an object sighted by the level are produced at the eyepiece, one of the images being upright and the other being inverted, and the level is characterized by the provision of a support structure 22 for the optical system arranged to maintain the optical system horizontal despite any tilting of the casing which may occur. As shown, the casing 10 which may be rotatably mounted on a base provided with an angularly graduated scale supports, by way of a pair of pedestals 20 extending upwardly from an annularly recessed base portion 14, a rotatably mounted pendulum 22 on which is mounted the inverting optical system 21. This system 21 may comprise a Dove prism or, in alternative embodiments, a mirror associated either with two other mirrors Fig.6 (not shown) or with a prism Fig.7 (not shown). The pendulum 22 which may be provided with an adjustable weight 26 for balancing purposes may be damped by the effects of a magnet attached to one of the pedestals 20. An observer sighting a target through the eye-piece 13 which may be of the magnifying type receives light rays which have passed through the inverting optical system as well as those which have by-passed the optical system on passing from the inlet 12 to the eyepiece 13 optionally by way of a beam splitter. The pendulum 22 may be clamped to the casing 10 when the sighting level is not in use.
GB5464172A
1971-12-07
1972-11-27
Builders level
Expired
GB1349438A
(en)
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
AUPA728871
1971-12-07
AUPA908272
1972-05-25
Publications (1)
Publication Number
Publication Date
GB1349438A
true
GB1349438A
(en)
1974-04-03
Family
ID=25641966
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB5464172A
Expired
GB1349438A
(en)
1971-12-07
1972-11-27
Builders level
Country Status (6)
Country
Link
US
(1)
US3807869A
(en)
JP
(1)
JPS4881562A
(en)
CA
(1)
CA977137A
(en)
DE
(1)
DE2258700A1
(en)
FR
(1)
FR2162534B1
(en)
GB
(1)
GB1349438A
(en)
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2459444A1
(en)
*
1979-06-14
1981-01-09
Bofors Ab
AUTOMATIC POINTING INSTRUMENT FOR CANON
WO1981002783A1
(en)
*
1980-03-26
1981-10-01
I Johnsson
Device for setting inclination
GB2160995A
(en)
*
1984-06-30
1986-01-02
Francis Albert Shaw Innes
Optical instrument stabiliser
Families Citing this family (13)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4149321A
(en)
*
1977-03-15
1979-04-17
Kivioja Lassi A
Mercury leveling instruments
FR2422182A1
(en)
*
1978-04-03
1979-11-02
Sopelem
OPTICAL OBSERVATION INSTRUMENT
US5724744A
(en)
*
1993-04-07
1998-03-10
Micro Italiana S.P.A.
Self-leveling device mounted on a rotating base for projecting laser rays
US5541727A
(en)
*
1993-08-27
1996-07-30
Rando; Joseph F.
Automatic level and plumb tool
US5459932A
(en)
*
1993-08-27
1995-10-24
Levelite Technology, Inc.
Automatic level and plumb tool
US5617202A
(en)
*
1994-05-24
1997-04-01
Levelite Technology, Inc.
Diode laser co-linear and intersecting light beam generator
US5610711A
(en)
*
1995-12-22
1997-03-11
Levelite Technology Inc.
Remote pointing system for a self-leveling laser instrument
US6542304B2
(en)
1999-05-17
2003-04-01
Toolz, Ltd.
Laser beam device with apertured reflective element
US7134211B2
(en)
2004-03-18
2006-11-14
Black & Decker Inc.
Laser level
US7181854B2
(en)
2004-08-17
2007-02-27
Eastway Fair Company Limited
Laser leveling device having a suction mounting arrangement
US20080052926A1
(en)
*
2006-09-05
2008-03-06
Eastway Fair Company Limited
Gravity dial level indicator for line generator
US20080052927A1
(en)
*
2006-09-05
2008-03-06
Eastway Fair Company Limited
Self-leveling line generator
US20080062669A1
(en)
*
2006-09-07
2008-03-13
Parel Thomas M
Gravity dial level indicator for line generator
Family Cites Families (5)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US1531693A
(en)
*
1921-11-12
1925-03-31
Leon F Douglass
Method and apparatus for producing novel and double-image effects in photography
DE550075C
(en)
*
1930-09-13
1932-05-13
Ludwig Becker Dr
Artificial horizon
US3013464A
(en)
*
1955-05-05
1961-12-19
Keuffel & Esser Co
Optical level
CH365228A
(en)
*
1957-05-27
1962-10-31
Magyar Optikai Muevek
Telescope with a light control pendulum
JPS51466B1
(en)
*
1969-07-31
1976-01-08
1972
1972-11-27
GB
GB5464172A
patent/GB1349438A/en
not_active
Expired
1972-11-29
US
US00310454A
patent/US3807869A/en
not_active
Expired – Lifetime
1972-11-30
DE
DE19722258700
patent/DE2258700A1/en
active
Pending
1972-11-30
CA
CA158,007A
patent/CA977137A/en
not_active
Expired
1972-12-06
JP
JP47121741A
patent/JPS4881562A/ja
active
Pending
1972-12-07
FR
FR7243551A
patent/FR2162534B1/fr
not_active
Expired
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2459444A1
(en)
*
1979-06-14
1981-01-09
Bofors Ab
AUTOMATIC POINTING INSTRUMENT FOR CANON
WO1981002783A1
(en)
*
1980-03-26
1981-10-01
I Johnsson
Device for setting inclination
GB2160995A
(en)
*
1984-06-30
1986-01-02
Francis Albert Shaw Innes
Optical instrument stabiliser
Also Published As
Publication number
Publication date
FR2162534A1
(en)
1973-07-20
JPS4881562A
(en)
1973-10-31
DE2258700A1
(en)
1973-06-14
CA977137A
(en)
1975-11-04
FR2162534B1
(en)
1976-06-11
US3807869A
(en)
1974-04-30
Similar Documents
Publication
Publication Date
Title
GB1349438A
(en)
1974-04-03
Builders level
GB844964A
(en)
1960-08-17
Levelling instrument with automatic compensation for small inclinations of the instrument
GB878463A
(en)
1961-09-27
Improvements in and relating to optical instruments
GB1516799A
(en)
1978-07-05
Levels
GB774437A
(en)
1957-05-08
Auxiliary instrument for the use with levelling instruments
US2552893A
(en)
1951-05-15
Theodolite scale reading system
GB599955A
(en)
1948-03-24
Levelling instrument
US1343025A
(en)
1920-06-08
Long-base single-observer range-finder
GB1155782A
(en)
1969-06-18
Eyepiece for an Optical Instrument
GB1262548A
(en)
1972-02-02
Indicator system for angle-measuring instruments including an altitude circle
GB1277624A
(en)
1972-06-14
Improvements in or relating to a precision balance
GB877877A
(en)
1961-09-20
Optical compensator and tilt detector
GB238275A
(en)
1925-08-05
Improvements in or relating to optical instruments
GB191414171A
(en)
1915-04-15
New or Improved Means for Taking Azimuth Bearings.
GB1132948A
(en)
1968-11-06
Gyroscopic theodolite
SU394658A1
(en)
1973-08-22
NIVELIR WITH A SELF-INSTALLING VISION LINE
GB1147473A
(en)
1969-04-02
Improvements in or relating to pendulum level inclinometers
GB1265143A
(en)
1972-03-01
GB804594A
(en)
1958-11-19
Improvements relating to optical instruments
GB1118022A
(en)
1968-06-26
Improvements in or relating to periscopes
GB725862A
(en)
1955-03-09
Improvements in or relating to artificial horizons
GB378626A
(en)
1932-08-18
Improvements in or connected with the adjustment of self-contained base rangefindersused as height measurers
GB761804A
(en)
1956-11-21
Improvements relating to levels
GB1025931A
(en)
1966-04-14
Improvements in or relating to optical image forming systems
GB862446A
(en)
1961-03-08
Improvements in or relating to optical sighting apparatus
Legal Events
Date
Code
Title
Description
1974-08-14
PS
Patent sealed [section 19, patents act 1949]
1979-06-27
PCNP
Patent ceased through non-payment of renewal fee
