GB1583519A - Torsion counteracting pivots - Google Patents
Torsion counteracting pivots Download PDFInfo
- Publication number
- GB1583519A GB1583519A GB20145/77A GB2014577A GB1583519A GB 1583519 A GB1583519 A GB 1583519A GB 20145/77 A GB20145/77 A GB 20145/77A GB 2014577 A GB2014577 A GB 2014577A GB 1583519 A GB1583519 A GB 1583519A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spindle
- platform
- centre
- hinged joint
- line
- 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
- 230000005484 gravity Effects 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
- F16C23/10—Bearings, parts of which are eccentrically adjustable with respect to each other
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
- F16M11/08—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a vertical axis, e.g. panoramic heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/20—Undercarriages with or without wheels
- F16M11/2007—Undercarriages with or without wheels comprising means allowing pivoting adjustment
- F16M11/2021—Undercarriages with or without wheels comprising means allowing pivoting adjustment around a horizontal axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M2200/00—Details of stands or supports
- F16M2200/02—Locking means
- F16M2200/021—Locking means for rotational movement
- F16M2200/022—Locking means for rotational movement by friction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M2200/00—Details of stands or supports
- F16M2200/04—Balancing means
- F16M2200/044—Balancing means for balancing rotational movement of the undercarriage
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Studio Devices (AREA)
Description
(54) IMPROVEMENTS IN OR RELATING TO TORSION COUNTERACTING PIVOTS
(71) We, W. VINTEN LIMITED, A
British Company of Western Way, Bury St.
Edumunds, Suffolk, England, do hereby declare the invention, for which we pray that a patent my be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to apparatus for counteraction of torsional movement on an article when pivotally mounted on a beam and when the centre of gravity of the article may be rotated off the longitudinal axis of the beam and more particularly, though not exclusively, to apparatus for maintaining a platform level when said platform is pivotally mounted on a beam and is mounted in such a manner that the centre of gravity of the platform is movable off the longitudinal axis of the beam.
Often, but more especially in the field of television, it is necessary to operate equipment which is mounted on a platform, located on, or at the end of, a beam. It is preferable that the platform is maintained level as the centre of gravity of the platform rotates off the longitudial axis of the beam.
However, as the centre of gravity of the platform, or the camera may be directly axis of the beam a torque is applied to the beam and the torsion causes the platform to tilt. Where this tilt of the platform is to be avoided extra strength has usually been applied to the beam with a consequent increase of weight and/or bulk. There are however, situations in which weight and/or bulk must be kept at a minimum. Such a situation is the field of television camera mountings wherein the equipment may have to be manhandled to a site for outside broadcasts or be manoeuvred around a studio with a minimum of effort, but maximum stability. Though there are other situations having similar problems it is in conjunction with that of television that the application will be described.
In the field of television camera mountings the mounting is sometimes located on a platorm, or the camera may be directly mounted on the platform, and the platform may be pivotally located on the beam for vertically pivotal movement about the longitudinal axis of the beam. The beam may also be pivitally mounted for rotation about vertical and horizontal pivots. Preferably the beam would be balanced about the horizontal axis for ease of control in elevation and a pantographic type linkage would be utilised to maintain the platform level as the elevation of the platform changed by pivital action of the beam about the horizontal axis. These types of apparatus are known and it is the mounting of the platform to the beam of this apparatus to which this invention is mainly directed.
The specific example taken is that wherein the platform is pivotally located on the end of the beam so that the centre of gravity of an article, mounted on the platform, traverses an arcuate path about the platform pivot point. As the centre of gravity traverses its arcuate path it is preferable that the path will be horizontal but due to the torsional twist of the beam the centre of gravity of the article is only on the horizontal path when in line with the longitudinal axis of the beam and dips proportionally below the horizontal path as it traverses to the right or left, being at a maximum low at 90" to the longitudinal axis of the beam. To overcome this problem it is necessary to maintain the platforms pivotal axis vertical.
It is therefore an object of this invention to provide a means whereby the arcuate path traversed by the centre of gravity of the article mounted on the platform, or the centre of gravity of the platform, is horizontal and the dip due to torsional twist of the beam is elimiated.
According to the invention we provide a hinged joint comprising a double ended bracket having a spindle pivotally mounted between said ends wherein a first end of said spindle is mounted for rotation about its axial centre, and a second end of said spindle is mounted for rotation about its axial centre and said axial centre of said second end in use is traverseable along a diameric line of the spindle.
According to a further aspect of the invention we provide a hinged joint comprising a double ended bracket having a spindle pivotally mounted between said ends wherein a first end of said spindle is mounted for rotation about its axial centre, a second end of said spindle is mounted for rotation about its axial centre and said axial centre of said second end in use is traverseable along a diametric line of the spindle, and an adjustable means is incorporated in said second end of said spindle for control of distance traversed along said diametric line of the spindle when said spindle is rotated.
According to a still further aspect of the invention we provide a hinged joint comprising a double ended bracket having a spindle pivotally mounted between said ends, a first end of said spindle mounted for rotation about its axial centre, a second end of said spindle mounted for rotationn about its axial centre and said axial centre of said second end in use is traverseable along a diametric line of the spindle, a beam for attachment of said double ended bracket and a platform located on and extending away from said spindle wherein said spindle maintains verticality when rotated with said platform by the action of said diametric traversing of said end thereby counteracting torsional twist of said beam caused by rotational movement of said platform with said spindle to maintain said platform level.
An embodiment of the invention will now be described, by way of example only, in conjunction with the drawings in which,
Figure 1 shows a pivoted beam of the type used for camera mountings and has the invention embodied.
Figure 2 shows a cross section through the side elevation of the invention when the platform is in line with the longitudinal axis of the beam,
Figures 3 and 4 show a cross-section and a plan view respectively of an eccentric stud of the invention,
Figure 5 shows a plan view of one spindle bearing in the second end of the double ended bracket and
Figure 6 shows a plan view of the second spindle bearing in the second end of the double ended bracket.
Referring to figure 1 a balanced beam (1) is mounted for pivotal movement about axis
A-A and is rotatable about the vertical on å tripod (2). A pantographic linkage comprising beam (l) cranked rod (3) bracket (4) and a link, formed by pivot pin (5) joining beam (1) and cranked rod (3), maintains bracket (4) vertical when the beam (1) is tilted aout axis A-A. A counterbalance weight (6) which may also be operated from pantographic linkage, not shown, counterbalances the apparatus about axis
A-A. A spindle (7) is mounted in the bracket (4) for rotational movement about the vertical pivot (8) of the spindle (7) for movement along line B-B as spindle (7) is rotated. A platform (9) attached, preferably adjustably, to the spindle (7) by an arm (10) may have a camera or the like mounted thereon. Screws, not shown, may be located in a block (11) of arm (10) so that the platform (9) may be levelled when aligned with the longitudinal axis of the beam (1) and the spindle (7) is vertical.
Counterbalance weight (6) may be adjustable to account for different weight cameras, or the like, locatable on platform (9).
Referring now to figure 2, the spindle (7) is shown located in a bearing (12), preferably self-aligning, in one end (13) of bracket (4), and in two bearings (i14) and (15), preferably self-aligning, in a second end (16) of bracket (4). Bearings (12) and (14) are preferably concentric with spindle (7).
Bearing (15) is preferably located on a eccentric stud (17) eccentrically locatable on the axis of spindle (7) and fixedly adjustable by screw (18). For ease of manufacture, end (16) of bracket (4) is bored for reception of a bush (19) into which bearings (14) and (15) may be located. Bearings (14) and (15) additionally act as cam followers and cams are formed by two parallel sides
(20) and (21), spaced apart by the width of bearing (14), permitting lateral movement of bearing (] 4) in relation to the longitudinal axis of beam (1), as shown on figures 2 and 5, by spaces (22) and (23). Bearing (15), also acting as a cam follower, is permitted movement, as shown in figure 6 by spaces (24) and (25), longitudinally in relation to the longitudinal axis of the beam (1), but may not move laterally due to parallel cams (26) and (27), shown on figure 6, spaced apart the width of bearing (15). The two sets of parallel cams may conveniently be shimed to provide a good fit but will preferably be of hardened material.
If bearings (14) and (15) were both concentically located on spindle (7) the effect of the four cams (20), (21), (26) and (27) would be to restrain movement of the bearings and permit only rotational movement of spindle (7) about its centre line. HoW- ever, the eccentricity of the location of bearing (15) and eccentric stud (17) in relation to the centre line of spindle (7), moves bearing (14) along cams (20) and (21) as spindle (7) is rotated, thus arm (10) and platform (9) tilt upwards proportionally to the degree of rotation of spindle (7). The degree of upward tilt may be adjusted by movement of the eccentrically located eccentric stud (17) about screw (18) along the longitudinal axis of arm (110) when in line with the longitudinal axis of beam (1).
A washer (28) provides a bearing surface for locking the eccentric stud (17) and bearing (15) to spindle (7) with screw (18).
When viewed in conjunction with beam (1) and platform (9), preferably with a camera or the like mounted on platform (9), the upward tilt of the platform (9) as the spindle (7) rotates may be adjusted to counteract for torsional twist of the beam (1) caused by the centre of gravity of the platform (9) and camera, or the like, mounted thereon, moving off the longitudinal axis of the beam (1).
Though the specific example has been described in conjunction with camera mounting equipment it will be obvious to those skilled in the art that many other applications of the invention may be made.
Figure 2 could be inverted and the hinged joint could be utilised as a door hinge so l:hat the base of the door rises over a carpet or the like as the door is opened. It may also be utilised as an anti-torsion device for any beam mounted mechanism wherein the mechanism is pivoted at or near the longitudinal centreline of the beam and is pivoted so that the centre of gravity of the mechanism moves off the longitudinal centre line of the beam.
It will also be obvious to those skilled in the art that by rotation of the bush (17) preselection of the position of the line BB may be obtained.
WHAT WE CLAIM IS: 1. A hinged joint comprising a double ended bracket having a spindle pivotally mounted between said ends wherein a first end of said spindle is mounted for rotation about its axial centre, and a scond end of said spindle is mounted for rotation about its axial centre and said axial centre of said second end in use is traverseable along a diametric line of the spindle.
2. A hinged joint as claimed in Claim 1 having an adjustable means incorporated in said second end of said spindle for control of distance traversed along said diametric line of the spindle when said spindle is rotated.
3. A hinged joint as claimed in Claim 1 or Claim 2 having an adjustable means incorporated in said second end of said spindle for control of distance traversed along said diametric line of the spindle when said spindle is rotated and said adjustable means further incorporates means for predetermining the position of said diametric line of the spindle.
4. A hinged joint as claimed in claim 2 or claim 3 wherein said adjustable means comprises a bush to which a bearing may be mounted and said bush has a diametrically elongated hole through which a screw or the like may be fitted for securing said bush to said second end of said spindle and said bearing acts as a cam follower moveable between two parallely aligned cams.
5. A hinged joint as claimed in any previous claim in combination with a beam attached to said double ended bracket and a mounting platform located on and extending away from said spindle, wherein said spindle maintains verticality when rotated with said platform by the action of said diametric traversing of said second end thereby counteracting torsional twist of said beam caused by rotational movement of said platform with said spindle to maintain said platform level.
6. A combination as claimed in claim 5 wherein said double ended bracket is attached to said beam to form a pantograph with said beam.
7. The combination as claimed in claim 4 or claim 5 wherein a camera or the like is attached to said mounting platform and the torsional twist of said beam caused by rotation of said mounting platform in use is counteracted for to maintain a theoretical vertical line drawn through the centre of gravity of the camera or the like vertical as said spindle is rotated.
8. A hinged joint in accordance with
Claim 4 substantially as herein described with reference to the drawings.
9. The combination in accordance with
Claim 7 substantially as herein described with reference to the drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (9)
1. A hinged joint comprising a double ended bracket having a spindle pivotally mounted between said ends wherein a first end of said spindle is mounted for rotation about its axial centre, and a scond end of said spindle is mounted for rotation about its axial centre and said axial centre of said second end in use is traverseable along a diametric line of the spindle.
2. A hinged joint as claimed in Claim 1 having an adjustable means incorporated in said second end of said spindle for control of distance traversed along said diametric line of the spindle when said spindle is rotated.
3. A hinged joint as claimed in Claim 1 or Claim 2 having an adjustable means incorporated in said second end of said spindle for control of distance traversed along said diametric line of the spindle when said spindle is rotated and said adjustable means further incorporates means for predetermining the position of said diametric line of the spindle.
4. A hinged joint as claimed in claim 2 or claim 3 wherein said adjustable means comprises a bush to which a bearing may be mounted and said bush has a diametrically elongated hole through which a screw or the like may be fitted for securing said bush to said second end of said spindle and said bearing acts as a cam follower moveable between two parallely aligned cams.
5. A hinged joint as claimed in any previous claim in combination with a beam attached to said double ended bracket and a mounting platform located on and extending away from said spindle, wherein said spindle maintains verticality when rotated with said platform by the action of said diametric traversing of said second end thereby counteracting torsional twist of said beam caused by rotational movement of said platform with said spindle to maintain said platform level.
6. A combination as claimed in claim 5 wherein said double ended bracket is attached to said beam to form a pantograph with said beam.
7. The combination as claimed in claim 4 or claim 5 wherein a camera or the like is attached to said mounting platform and the torsional twist of said beam caused by rotation of said mounting platform in use is counteracted for to maintain a theoretical vertical line drawn through the centre of gravity of the camera or the like vertical as said spindle is rotated.
8. A hinged joint in accordance with
Claim 4 substantially as herein described with reference to the drawings.
9. The combination in accordance with
Claim 7 substantially as herein described with reference to the drawings.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB20145/77A GB1583519A (en) | 1977-05-13 | 1977-05-13 | Torsion counteracting pivots |
AU36681/78A AU3668178A (en) | 1977-05-13 | 1978-05-31 | Torsion counteracting pivots |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB20145/77A GB1583519A (en) | 1977-05-13 | 1977-05-13 | Torsion counteracting pivots |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1583519A true GB1583519A (en) | 1981-01-28 |
Family
ID=10141123
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB20145/77A Expired GB1583519A (en) | 1977-05-13 | 1977-05-13 | Torsion counteracting pivots |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU3668178A (en) |
GB (1) | GB1583519A (en) |
-
1977
- 1977-05-13 GB GB20145/77A patent/GB1583519A/en not_active Expired
-
1978
- 1978-05-31 AU AU36681/78A patent/AU3668178A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
AU3668178A (en) | 1979-12-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |