US3734220A - Self-propelled platform tower having mechanical and hydraulic supporting means - Google Patents

Self-propelled platform tower having mechanical and hydraulic supporting means Download PDF

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Publication number
US3734220A
US3734220A US00216102A US3734220DA US3734220A US 3734220 A US3734220 A US 3734220A US 00216102 A US00216102 A US 00216102A US 3734220D A US3734220D A US 3734220DA US 3734220 A US3734220 A US 3734220A
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corner posts
mechanical
cylinder
platform
hydraulic
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US00216102A
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English (en)
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R Smith
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
    • E02B17/021—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform
    • E02B17/022—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform adapted to travel on the bottom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D57/00—Vehicles characterised by having other propulsion or other ground- engaging means than wheels or endless track, alone or in addition to wheels or endless track

Definitions

  • ABSTRACT This invention relates to a deck or work platform of improved design supported so that it can be moved into a selected direction over the ground, both under water and on land. It may be used on the sea bottom, particularly at an offshore location and it may also be used on tundra, muskeg, swampy locations and the like.
  • the improved tower of the present invention has combined mechanical and hydraulic support means and normally the hydraulic means would be used when moving the tower from one place to another while the mechanical support means would ordinarily be used after the tower was in a desired location.
  • Pat. No. 3,612,210 I described and claimed an improved self-propelled platform tower which could not only move forward and back and sideways, but which could also be moved in an angular direction.
  • My invention provided a simple, rugged corner structure which enabled the platform to be moved at an angle.
  • Hydraulic lifts have many obvious advantages since they are simple, inexpensive structures, capable of exerting enormous pressures.
  • hydraulic lifts do suffer from one defect, namely, that it is almost impossible to provide a hydraulic lift without some slight leakage. This presents no problem when the hydraulic mechanism is actively in use such as when the platform is being moved from one location to another.
  • some means must be provided for maintaining pressure in the system to make up for any small leaks. This is particularly important if the platform is located on irregular ground, which is usually the case.
  • a dual system which has all'of the advantages and none of the disadvantages of a purely hydraulic system.
  • Hydraulics are used for moving the platform from place-to-place but after the platform is once in place, the mechanical system can be brought into play to support the structure so that it is not necessary to maintain oil pressure when the platform is left for long periods of time.
  • the mechanical and hydraulic systems are independent, the maximum raise can be substantially greater than that provided by the hydraulic cylinder alone.
  • the mechanical system is made strong enough to raise the tower if this is found necessary and serves to extend the range through which the legs can be moved.
  • FIG. 1 is a perspective view of a moveable platform embodying the present invention.
  • FIG. 2 is a side view of such a platform showing the operation of moving the platform from place-to-place.
  • FIG. 3 is a section through one of the legs of the moveable platform.
  • FIG. 4 is a section on the line 44 of FIG. 3.
  • FIG. 5 is an enlarged partial section with some parts cut away of the mechanical drive mechanism.
  • FIG. 6 is a plan view of the platform.
  • FIG. 7 is a diagrammatic view showing how the platform and table assembly can be skewed for angular movement.
  • FIG. 8 is a section on the line 88 of FIG. 6.
  • FIG. 9 is an enlarged section of a horizontal support assembly used in the platform.
  • a work deck or platform 7 This is generally rectangular in shape and provides a solid working surface to support suitable tools such as a derrick.
  • a control panel 9 mounted on the surface of the deck is a control panel 9 which includes suitable controls for operation of hydraulic pump 11 which is utilized to supply pressure for the operation of various hydraulic rams as will be described.
  • Control panel 9 also serves to control the motors of the mechanical systems.
  • each corner post includes and supports a moveable ground engaging member 13.
  • Each ground engaging member can be selectively raised and lowered with respect to its supporting corner post by means later described in detail.
  • I provide a rectangular frame 18 which is selectively moveable in a fore and aft direction as indicated by arrows 15 with respect to the deck, in a direction transverse to the deck as indicated by arrows 20 and at angles thereto as indicated by arrows 16.
  • the frame 18 is made up of longitudinal members 19 and transverse members 21 joined together to form a rectangular frame.
  • a second set of four corner posts 22 is provided at each corner of the frame. These may be similar in construction to each of the four corner posts previously described and which are attached to the deck 7; each of the corner posts 22 supports a moveable ground engaging member 23 which is raised and lowered by the means later described.
  • a rectangular frame, generally indicated at 26, is mounted, this having an upper channel rail 27 and a lower channel rail 28, supported on one side by corner post 12 and at the other end by the vertical member 29.
  • the horizontal members 19 are supported in a hexagonal frame 31 (FIG. 9) having vertically extending rollers 32 mounted therein on opposite sides to support one of the members 19.
  • tracks 33 are provided and are engaged with horizontal rollers 34.
  • rollers 36 ride in the channel rails 27 and 28 to permit the hexagonal frame and the supported frame 18 to be moved transversely of the deck by the hydraulic ram, generally indicated at 39.
  • each of the piston rods 38 being connected to one of the corner posts 12.
  • both sets of rams would be actuated to skew the platform as is shown in FIG. 7.
  • the hexagonal frame members 31 can be employed at all four corners, or only two need be used, one on each end.
  • Each leg includes a tubular member 40, having a telescoping leg 42 slideably mounted therein with a foot plate 44.
  • Hydraulic cylinder 46 is attached to leg 42 by means of connection 48, the hydraulic cylinder 46 having the usual piston 50 and piston rod 52, the top of the piston rod being attached by connection 54 to the cylinder 40. Oil through lines 56 is supplied from pump 11.
  • Cylinder 40 is provided The a plurality of racks 58, suitably four in number, each of which passes through a slot 60 in a keeper assembly 62. By passing through slot 60, cylinder 40 is prevented from turning but may slide up and down in corner assembly 62. It will be understood that the keeper 62 can form a corner of the work deck 7 or the frame member 18.
  • Mounted in slot 61 in keeper 62 is a ring gear 66 having concave spur teeth 68 on its outer surface and a helical thread 70 on its inner surface. Thread 70 meshes with he racks 58.
  • a worm gear 72 driven by a motor 74 meshes with the spur teeth 68.
  • FIG. 2 The method by which the device crawls from one location to the other is shown in FIG. 2.
  • the feet 13 of platform 7 are in contact with the surface of the ground or a sea bottom as at 17.
  • the feet 23 of the frame member 18 are now raised, and by the action of the cylinders 39 or 37 or a combination of both sets of cylinders, the frame is moved in a desired direction which may be forward, aft, sideways, or at an angle to a position such as that shown in dot dash lines in FIG. 2.
  • the feet 23 of the'frame are now lowered to support the entire structure and now the platform feet are raised; the frame can remain stationary while the platform 7 is moved in a desired direction, again by the use of the cylinders 37 or 39 or a combination thereof.
  • one of the advantages of the present invention is that it combines the best features of the mechanical and hydraulic systems.
  • the mechanical system need not be actuated, and all of the vertical movement is accomplished by use of the hydraulic system.
  • the mechanical system can be used to extend the legs while simultaneously withdrawing them by means of the hydraulic system so that finally the bottom of the cylinder 40 rests on the foot member 44 as is shown in FIG. 1.
  • the platform will be stable because of the large amount of friction in the mechanical system and the hydraulic system can be completely deactivated.
  • the mechanical system can be made much weaker than the hydraulic system, thus effecting a substantial saving in cost.
  • the platform legs might be fitted with combined mechanical and hydraulic legs, while the frame had only hydraulic legs.
  • it is desirable to make the mechanical system strong enough to elevate the platform in which case one obtains the advantage of much greater extension of the legs than could be obtained with either the hydraulic or the mechanical system alone, permitting operation over a wider range of terrain.
  • the legs can be threaded and rotated in fixed nuts to raise and lower the legs.
  • a moveable platform comprising:
  • each of said first corner posts including and supporting a movable ground engaging member therein
  • each of said second corner posts including and supporting a movable I ground engaging member therein
  • said means (j) for at least one of said sets of corner posts comprising a first system for extending and retracting each ground engaging member hydraulically and a second system for extending and retracting each ground engaging member mechanidown in said cylinder, and cally.
  • mechanical means adapted to move said cylinder 2.
  • the structure of claim 1 wherein both the first and up and down in said keeper structure.
  • second sets of corner posts are provided with both me- 4.
  • said mechanical chanical and hydraulic systems. 5 means includes:
  • each of the supa. at least one rack mounted on the outside of said porting corner posts includes the following structure: cylinder,
  • a cylinder mounted to move up and down in a b. a ring gear having an internal helical thread meshkeeper structure, ing with said rack, and b. a telescoping leg mounted to move up and down c. means for turning said ring gear to move the cylinin said cylinder, der up and down.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Transmission Devices (AREA)
  • Earth Drilling (AREA)
US00216102A 1972-01-07 1972-01-07 Self-propelled platform tower having mechanical and hydraulic supporting means Expired - Lifetime US3734220A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US21610272A 1972-01-07 1972-01-07

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US3734220A true US3734220A (en) 1973-05-22

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US (1) US3734220A (cs)
CA (1) CA966321A (cs)
GB (1) GB1364811A (cs)
NL (1) NL7216925A (cs)

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3957010A (en) * 1975-08-29 1976-05-18 Soulant Jr Herman A Stabilization system for water vehicles, platforms, and structures in wind-maintained seas
US4142818A (en) * 1977-03-14 1979-03-06 Lezgintsev Georgy M Device for travelling along the basin and sea bottom
US4270877A (en) * 1977-12-09 1981-06-02 Steven Baggeren V.V. Working platform
US4288177A (en) * 1979-05-10 1981-09-08 Rsv-Gusto Engineering B.V. Walking platform construction
USD270907S (en) 1981-07-06 1983-10-11 Younes David T Self-elevating line testing vessel for offshore oil lines or the like
USD271098S (en) 1981-06-18 1983-10-25 Younes David T Self-elevating well servicing vessel for offshore oil wells or the like
GB2118500A (en) * 1982-03-27 1983-11-02 Middleton Douglas Limited Transport arrangement for a mine conveyor
US4436454A (en) 1980-12-23 1984-03-13 Ateliers Et Chantiers De Bretagne-Abc Device for positioning an off-shore platform on its support structure
US4662465A (en) * 1984-04-02 1987-05-05 Stewart David E S Walking vehicle
US4790400A (en) * 1986-07-24 1988-12-13 Eric Sheeter Stepping vehicle
GB2218398A (en) * 1988-05-11 1989-11-15 Danzoe Eng Ltd Crane mounted on rail chassis
GB2260523A (en) * 1991-10-16 1993-04-21 Ah Lik Heu Movable heavy load carriage device
US5351773A (en) * 1992-12-01 1994-10-04 Ken Yanagisawa Walking robot
US5906457A (en) * 1997-08-30 1999-05-25 Zentech, Inc. Offshore jackup elevating and leg guide arrangement and hull-to-legs load transfer device
US20040037681A1 (en) * 2002-08-13 2004-02-26 Neil Marcotte Road transportable loading machine for gondola cars
GB2412632A (en) * 2004-03-16 2005-10-05 Seacore Ltd Displaceable platform structure and method of the displacement thereof
US20060090938A1 (en) * 2004-11-04 2006-05-04 Minas Tanielian Robotic all terrain surveyor
US20060235571A1 (en) * 2003-09-12 2006-10-19 Katsuyuki Baba Access control system in radio lan system
WO2010072108A1 (zh) * 2008-12-25 2010-07-01 陕西石玖科技实业有限公司 步行组装自升式钻井平台
CN102039989A (zh) * 2009-10-19 2011-05-04 王国治 步行组装自升式钻井平台
CN102050309A (zh) * 2010-12-06 2011-05-11 黎志中 山地运输机
CN102190072A (zh) * 2010-03-08 2011-09-21 大连船舶重工集团有限公司 潮间带自升自行式工作船
CN102887182A (zh) * 2012-10-12 2013-01-23 北京交通大学 全移动副移动机构
CN103469775A (zh) * 2013-09-05 2013-12-25 中交第二航务工程局有限公司 水上可移动升降式多功能工作平台
US20140326521A1 (en) * 2011-11-28 2014-11-06 Matia Robotics Mekatronik Sistemler Ar-Ge Mühendi- Slik Yazilim Sanayi Ve Ticaret Transport device
US9073588B1 (en) 2014-06-05 2015-07-07 Orion Drilling Company Heavy machinery substructure for traversing and working over ground obstructions
CN105059414A (zh) * 2015-07-17 2015-11-18 大连四达高技术发展有限公司 表面爬行机器人
US20160186495A1 (en) * 2014-12-24 2016-06-30 Superior Energy Services-North America Services, Inc. Transport Platform Apparatus And Method
CN106828653A (zh) * 2017-01-18 2017-06-13 燕山大学 一种无线控制气动仿生爬行机器狗
US9862437B2 (en) * 2011-12-16 2018-01-09 Entro Industries, Inc. Mounting structure with storable transport system
USRE46723E1 (en) 2011-12-16 2018-02-20 Entro Industries, Inc. Alignment restoration device for load transporting apparatus
US10556631B2 (en) 2011-12-16 2020-02-11 Entro Industries, Inc. Low profile roller assembly
US10793409B2 (en) 2017-07-12 2020-10-06 Entro Industries, Inc. Lifting loads with lifting devices
US10889961B2 (en) 2017-08-08 2021-01-12 Entro Industries, Inc. Automatic walking for a load transporting apparatus
US10895882B2 (en) 2017-08-01 2021-01-19 Entro Industries, Inc. Controlling load transporting devices
US10899401B2 (en) 2017-06-05 2021-01-26 Entro Industries, Inc. Yaw alignment system
US11180319B2 (en) 2017-11-22 2021-11-23 Entro Industries, Inc. Skid system for load transport apparatus
US11407460B2 (en) 2018-05-31 2022-08-09 Entro Industries, Inc. Nonlinear walking apparatus

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RU2370400C1 (ru) * 2008-03-07 2009-10-20 Государственное образовательное учреждение высшего профессионального образования "Воронежский государственный технический университет" Механизм передвижения транспортных и землеройных машин
CN108252286B (zh) * 2016-12-28 2021-06-01 广东海上城建控股发展有限公司 坐底式水上平台及其水上运输安装方法
RU2651328C1 (ru) * 2017-01-23 2018-04-19 Федеральное государственное унитарное предприятие "Крыловский государственный научный центр" Плавучая буровая установка

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FR502932A (fr) * 1921-02-28 1920-05-29 Augustin Georges Quelin Véhicule entrainant des voies sur lesquelles il effectue son parcours
US2822878A (en) * 1954-01-07 1958-02-11 Paul E Corson Walking tractor
GB882911A (en) * 1958-05-05 1961-11-22 Bade & Co Gmbh Gear for moving heavy rigs over open ground
US3135345A (en) * 1961-02-06 1964-06-02 Arthur W Scruggs Multi-ped vehicle
US3255836A (en) * 1962-12-29 1966-06-14 Beteiligungs & Patentverw Gmbh Walking mechanism for excavating machines
US3612201A (en) * 1970-06-18 1971-10-12 Richard H Smith Self-propelled platform tower

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR502932A (fr) * 1921-02-28 1920-05-29 Augustin Georges Quelin Véhicule entrainant des voies sur lesquelles il effectue son parcours
US2822878A (en) * 1954-01-07 1958-02-11 Paul E Corson Walking tractor
GB882911A (en) * 1958-05-05 1961-11-22 Bade & Co Gmbh Gear for moving heavy rigs over open ground
US3135345A (en) * 1961-02-06 1964-06-02 Arthur W Scruggs Multi-ped vehicle
US3255836A (en) * 1962-12-29 1966-06-14 Beteiligungs & Patentverw Gmbh Walking mechanism for excavating machines
US3612201A (en) * 1970-06-18 1971-10-12 Richard H Smith Self-propelled platform tower

Cited By (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3957010A (en) * 1975-08-29 1976-05-18 Soulant Jr Herman A Stabilization system for water vehicles, platforms, and structures in wind-maintained seas
US4142818A (en) * 1977-03-14 1979-03-06 Lezgintsev Georgy M Device for travelling along the basin and sea bottom
US4270877A (en) * 1977-12-09 1981-06-02 Steven Baggeren V.V. Working platform
US4288177A (en) * 1979-05-10 1981-09-08 Rsv-Gusto Engineering B.V. Walking platform construction
US4436454A (en) 1980-12-23 1984-03-13 Ateliers Et Chantiers De Bretagne-Abc Device for positioning an off-shore platform on its support structure
USD271098S (en) 1981-06-18 1983-10-25 Younes David T Self-elevating well servicing vessel for offshore oil wells or the like
USD270907S (en) 1981-07-06 1983-10-11 Younes David T Self-elevating line testing vessel for offshore oil lines or the like
GB2118500A (en) * 1982-03-27 1983-11-02 Middleton Douglas Limited Transport arrangement for a mine conveyor
US4662465A (en) * 1984-04-02 1987-05-05 Stewart David E S Walking vehicle
US4790400A (en) * 1986-07-24 1988-12-13 Eric Sheeter Stepping vehicle
GB2218398A (en) * 1988-05-11 1989-11-15 Danzoe Eng Ltd Crane mounted on rail chassis
GB2260523A (en) * 1991-10-16 1993-04-21 Ah Lik Heu Movable heavy load carriage device
US5351773A (en) * 1992-12-01 1994-10-04 Ken Yanagisawa Walking robot
US5906457A (en) * 1997-08-30 1999-05-25 Zentech, Inc. Offshore jackup elevating and leg guide arrangement and hull-to-legs load transfer device
US20040037681A1 (en) * 2002-08-13 2004-02-26 Neil Marcotte Road transportable loading machine for gondola cars
US7156603B2 (en) * 2002-08-13 2007-01-02 Brandt Road Rail Corporation Road transportable loading machine for gondola cars
US20060235571A1 (en) * 2003-09-12 2006-10-19 Katsuyuki Baba Access control system in radio lan system
GB2412632B (en) * 2004-03-16 2008-03-26 Seacore Ltd Displaceable platform structure and method of the displacement thereof
US8025462B2 (en) 2004-03-16 2011-09-27 Fugro Seacore, Ltd. Displaceable platform structure and method of the displacement thereof
GB2412632A (en) * 2004-03-16 2005-10-05 Seacore Ltd Displaceable platform structure and method of the displacement thereof
US7165637B2 (en) * 2004-11-04 2007-01-23 The Boeing Company Robotic all terrain surveyor
US20070144798A1 (en) * 2004-11-04 2007-06-28 Minas Tanielian Robotic all terrain surveyor
US20080083571A1 (en) * 2004-11-04 2008-04-10 The Boeing Company Robotic vehicle apparatus and method
US7434638B2 (en) * 2004-11-04 2008-10-14 The Boeing Company Robotic all terrain surveyor
US7490681B2 (en) 2004-11-04 2009-02-17 The Boeing Company Robotic rolling vehicle apparatus and method
US20090099709A1 (en) * 2004-11-04 2009-04-16 The Boeing Company Robotic vehicle apparatus and method
US20060090938A1 (en) * 2004-11-04 2006-05-04 Minas Tanielian Robotic all terrain surveyor
US8467925B2 (en) 2004-11-04 2013-06-18 The Boeing Company Robotic vehicle apparatus and method
US7963351B2 (en) 2004-11-04 2011-06-21 The Boeing Company Robotic vehicle apparatus and method
US20110196558A1 (en) * 2004-11-04 2011-08-11 The Boeing Company Robotic Vehicle Apparatus and Method
WO2010072108A1 (zh) * 2008-12-25 2010-07-01 陕西石玖科技实业有限公司 步行组装自升式钻井平台
CN102039989A (zh) * 2009-10-19 2011-05-04 王国治 步行组装自升式钻井平台
CN102190072A (zh) * 2010-03-08 2011-09-21 大连船舶重工集团有限公司 潮间带自升自行式工作船
CN102050309A (zh) * 2010-12-06 2011-05-11 黎志中 山地运输机
US20140326521A1 (en) * 2011-11-28 2014-11-06 Matia Robotics Mekatronik Sistemler Ar-Ge Mühendi- Slik Yazilim Sanayi Ve Ticaret Transport device
US9629761B2 (en) * 2011-11-28 2017-04-25 Matia Robotics Mekatronik Sistemler Ar-Ge Muhendislik Yazilim Sanayi Ve Ticaret Anonim Sirketi Transport device
US10207756B2 (en) 2011-12-16 2019-02-19 Entro Industries, Inc. Mounting structure with storable transport system
US10556631B2 (en) 2011-12-16 2020-02-11 Entro Industries, Inc. Low profile roller assembly
US9862437B2 (en) * 2011-12-16 2018-01-09 Entro Industries, Inc. Mounting structure with storable transport system
US9988112B2 (en) 2011-12-16 2018-06-05 Entro Industries, Inc. Mounting structure with storable transport system
USRE46723E1 (en) 2011-12-16 2018-02-20 Entro Industries, Inc. Alignment restoration device for load transporting apparatus
CN102887182B (zh) * 2012-10-12 2015-07-01 北京交通大学 全移动副移动机构
CN102887182A (zh) * 2012-10-12 2013-01-23 北京交通大学 全移动副移动机构
CN103469775A (zh) * 2013-09-05 2013-12-25 中交第二航务工程局有限公司 水上可移动升降式多功能工作平台
CN103469775B (zh) * 2013-09-05 2015-07-08 中交第二航务工程局有限公司 水上可移动升降式多功能工作平台
US9073588B1 (en) 2014-06-05 2015-07-07 Orion Drilling Company Heavy machinery substructure for traversing and working over ground obstructions
WO2015187987A1 (en) * 2014-06-05 2015-12-10 Orion Drilling Company Heavy machinery substructure for traversing and working over ground obstructions
US20160186495A1 (en) * 2014-12-24 2016-06-30 Superior Energy Services-North America Services, Inc. Transport Platform Apparatus And Method
US10144463B2 (en) * 2014-12-24 2018-12-04 Superior Energy Services-North America Services, Inc Transport platform apparatus and method
CN105059414A (zh) * 2015-07-17 2015-11-18 大连四达高技术发展有限公司 表面爬行机器人
CN106828653A (zh) * 2017-01-18 2017-06-13 燕山大学 一种无线控制气动仿生爬行机器狗
US10899401B2 (en) 2017-06-05 2021-01-26 Entro Industries, Inc. Yaw alignment system
US10793409B2 (en) 2017-07-12 2020-10-06 Entro Industries, Inc. Lifting loads with lifting devices
US10895882B2 (en) 2017-08-01 2021-01-19 Entro Industries, Inc. Controlling load transporting devices
US10889961B2 (en) 2017-08-08 2021-01-12 Entro Industries, Inc. Automatic walking for a load transporting apparatus
US11180319B2 (en) 2017-11-22 2021-11-23 Entro Industries, Inc. Skid system for load transport apparatus
US11407460B2 (en) 2018-05-31 2022-08-09 Entro Industries, Inc. Nonlinear walking apparatus

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Publication number Publication date
NL7216925A (cs) 1973-07-10
CA966321A (en) 1975-04-22
GB1364811A (en) 1974-08-29

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