WO1993012372A1 - Improvements in or relating to clamps for extending legs - Google Patents

Improvements in or relating to clamps for extending legs Download PDF

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Publication number
WO1993012372A1
WO1993012372A1 PCT/GB1992/002302 GB9202302W WO9312372A1 WO 1993012372 A1 WO1993012372 A1 WO 1993012372A1 GB 9202302 W GB9202302 W GB 9202302W WO 9312372 A1 WO9312372 A1 WO 9312372A1
Authority
WO
WIPO (PCT)
Prior art keywords
jaws
clamp
base
members
shaped
Prior art date
Application number
PCT/GB1992/002302
Other languages
French (fr)
Inventor
Richard Arthur Lindsay
Original Assignee
Vinten Group Plc
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.)
Filing date
Publication date
Application filed by Vinten Group Plc filed Critical Vinten Group Plc
Publication of WO1993012372A1 publication Critical patent/WO1993012372A1/en

Links

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
    • 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
    • F16M11/24—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other
    • F16M11/26—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other by telescoping, with or without folding
    • F16M11/32—Undercarriages for supports with three or more telescoping legs
    • F16M11/34—Members limiting spreading of legs, e.g. "umbrella legs"
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
    • F16B7/04—Clamping or clipping connections
    • F16B7/0433—Clamping or clipping connections for rods or tubes being in parallel relationship
    • 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
    • F16M2200/025—Locking means for translational movement
    • F16M2200/027—Locking means for translational movement by friction

Definitions

  • This invention relates to clamps for extending legs.
  • the invention is particularly, although not exclusively, applicable to extending legs for tripods for supporting cameras and the like in which each leg has at least two parts which extend with respect to each other, one part carrying a clamp and the other part comprising a pair of circular cross-section members engageable in the clamp to be locked in any position of required extension.
  • Our U.K. Patent Application No. 9114051.7 discloses such a clamp comprising a housing, a first member moveable relative to the housing to affect clamping, torque limiting drive means rotatable in a forward direction relative to the housing to affect the clamping movement of the first member and lost motion stop means rotatable by the drive means into a first stop position relative the housing and into a second.
  • This invention provides a clamp for an extending leg comprising a base for mounting on one part of the leg and a pair of resilient C-shaped clamping jaws mounted on the base with the axes of the jaws spaced apart parallel to one another to receive a pair of parallel circular cross-section members forming another part of the leg and means on the base acting on the jaws to close the jaws around the members to grip and lock the clamp to the members.
  • the C-shaped jaws are mounted on the base with the open sides of the Cs facing towards each other along the base.
  • the C-shaped jaws are connected together by a bridging member mounted on the base.
  • each of the C-shaped jaws may be formed integrally with the bridging member.
  • each C-shaped clamp may have an outwardly projecting lug and said means to close the C-shaped jaws around the parallel members may act on the projecting lugs.
  • An actuating device may be mounted at the centre of the base between the jaws including a clamping member for engaging said lugs of the C-shaped jaws and means to draw the clamping member towards the base and thereby close the jaws on the leg members.
  • the wall thickness of the C-shaped jaws may reduce towards the regions of the jaws adjacent the bridging to provide an increase in flexibility in those regions whereby the jaws are more readily closed on the members extending through the jaws by the action of the clamping member on the jaws.
  • the C-shaped jaws may be separately mounted on the base, one being fixed to the base and the other being free to float over a limited range of movement with respect to said one jaw to accommodate non-alignment of the pair of members passing through the jaws.
  • Figure 1 is a perspective view of a tripod for mounting a film or video camera having legs which are extendible in two stages;
  • Figure 2 is a detailed view of a joint between two components of one of the legs including a locking device for locking the components in a required position of adjustment;
  • Figure 3 shows the components of a clamp in accordance with the invention for telescopically connecting one leg component comprising an outer pair of parallel tubes telescopically with another leg component comprising an inner pair of parallel tubes;
  • Figure 4 shows a modified version of a similar arrangement
  • Figure 5 is a similar view to Figure 1 showing the clamp of the invention applied to another form of tripod;
  • Figures 6 and 7 show a lower clamp on one of the legs of the tripod in greater detail.
  • FIG. 1 of the drawings shows a conventional commercial camera tripod comprising a levelling bowl 10 to receive a bearing of a pan/tilt camera mounted in conventional manner.
  • the levelling bowl has three hinge members 11 pivotally connected by pivot pins 12 to the bowl at spaced locations around the bowl to hinge three telescopically extending legs indicated at 13 to the bowl.
  • Each leg is formed in three components telescopically connected together and comprising an upper component indicated at 14 consisting of a pair of widely spaced parallel tubes 15 and telescopically connected by a connector/clamp 16 to an intermediate component indicated at 17 comprising a pair of more narrowly spaced parallel tubes 18.
  • the intermediate component 17 is, in turn, telescopically connected by a connector/clamp indicated at 19 to a single oval section tube 20.
  • the lower ends of the tubes 20 are connected to the outer ends of a three-arm adjustable spreader 21.
  • Figure 2 of the drawings illustrates the connector/clamp 16 between the upper and intermediate components 13, 17 of the leg and comprises a bridge member 22 having an inner pair of bores 23 through which the tubes of the intermediate leg extend slidably and an outer pair of sockets 24 in which the lower ends of the outer pair of tubes 15 of the upper component are secured by adhesive.
  • a clamp 25 locks the upper and intermediate components of the leg together in any required position of adjustment.
  • the clamp comprises a base 26 having a spaced pair of downwardly facing sockets 27 in which the upper ends of the parallel tubes 18 of the intermediate leg 17 are secured by adhesive to fasten the clamp to the upper end of the intermediate member.
  • the clamp has a pair of parallel bores 28 through which the parallel tubes 15 of the upper component 14 of the leg are slidable.
  • the clamp further comprises a pair of c-shaped clamping jaws 30 to receive and engage the parallel tubes 15.
  • the jaws are interconnected by a bridging member 31 mounted on base 27 and with which one jaw of each C-shaped member is integrally formed to support the jaws spaced apart across the base with the open sides of the jaws facing towards each other.
  • the other jaw of each C-shaped clamp has an outwardly projecting lug 32 and a clamping member 34 engages with the lugs 32 and is engaged by an adjustable rotary clamping device indicated at 35 mounted on the base. Rotation of the clamping device in one direction draws the clamping plate 34 towards the base and thereby closes the C-shaped jaws onto the tubes passing through the jaws to lock the.clamp to the tubes.
  • the C-shaped jaws are separately mounted on the base, one being fixed to the base and the other being free to float over a limited movement with respect to the base towards and away from the other jaw to accommodate slight out alignment in the parallel tubes as they slide through the clamp to avoid binding of the tubes in the clamp.
  • Figures 5 to 7 is generally similar to that described with reference to Figures 1 to 4 of the drawings except that the single oval section tubes forming the lower most members of the legs are replaced by a pair of parallel tubes 40 which are telescopically engaged in the parallel tubes 18 of the intermediate legs above.
  • the base 26 of the clamp 25 has sockets 27 in which the lower ends of the tubes 18 are secured and the C-shaped clamping jaws mounted on the base engage around the parallel tubes 40 of the lowermost leg member to lock the leg member in relation to the intermediate leg member 17.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Accessories Of Cameras (AREA)

Abstract

The disclosure relates to a clamp (16) for an extendable leg at least one part (13) of which comprises a pair of parallel circular cross-section members. The clamp comprises a base (22) for mounting on the other part (17) of the leg and having a pair of resilient C-shaped clamping jaws (30) mounted on the base with their axes spaced apart and extending parallel to one another to receive the circular cross-section members (15) forming said one part of the leg. A clamping member (34, 35) is mounted on the base to act on the jaws to close the C-shapes around the members to grip and lock the jaws to the members. The arrangement is particularly suitable for the extendable legs of a tripod for supporting a camera.

Description

"IMPROVEMENTS IN OR RELATING TO CLAMPS FOR EXTENDING LEGS"
This invention relates to clamps for extending legs.
The invention is particularly, although not exclusively, applicable to extending legs for tripods for supporting cameras and the like in which each leg has at least two parts which extend with respect to each other, one part carrying a clamp and the other part comprising a pair of circular cross-section members engageable in the clamp to be locked in any position of required extension. Our U.K. Patent Application No. 9114051.7 discloses such a clamp comprising a housing, a first member moveable relative to the housing to affect clamping, torque limiting drive means rotatable in a forward direction relative to the housing to affect the clamping movement of the first member and lost motion stop means rotatable by the drive means into a first stop position relative the housing and into a second. stop position spaced angularly from the first stop position as a consequence of reverse rotation of the drive means in which said second stop position continued reverse rotation of the drive means is prevented. This arrangement avoids overtightening of the threaded member of the clamp and also holds the threaded member relatively captive so that it cannot be completely unscrewed.
With such arrangements, a relatively high clamping torque is required to effect the locking action of the clamp on the two sections. It is an object of this invention to provide a clamp for a pair of parallel circular cross-section members in which a relatively high clamping force can be achieved with a low clamping torque.
This invention provides a clamp for an extending leg comprising a base for mounting on one part of the leg and a pair of resilient C-shaped clamping jaws mounted on the base with the axes of the jaws spaced apart parallel to one another to receive a pair of parallel circular cross-section members forming another part of the leg and means on the base acting on the jaws to close the jaws around the members to grip and lock the clamp to the members.
Preferably the C-shaped jaws are mounted on the base with the open sides of the Cs facing towards each other along the base.
It is also preferred that the C-shaped jaws are connected together by a bridging member mounted on the base.
More specifically one end of each of the C-shaped jaws may be formed integrally with the bridging member.
The other end of each C-shaped clamp may have an outwardly projecting lug and said means to close the C-shaped jaws around the parallel members may act on the projecting lugs.
An actuating device may be mounted at the centre of the base between the jaws including a clamping member for engaging said lugs of the C-shaped jaws and means to draw the clamping member towards the base and thereby close the jaws on the leg members.
In accordance with a further feature of the invention the wall thickness of the C-shaped jaws may reduce towards the regions of the jaws adjacent the bridging to provide an increase in flexibility in those regions whereby the jaws are more readily closed on the members extending through the jaws by the action of the clamping member on the jaws.
In an alternative construction, the C-shaped jaws may be separately mounted on the base, one being fixed to the base and the other being free to float over a limited range of movement with respect to said one jaw to accommodate non-alignment of the pair of members passing through the jaws.
The following is a description of some specific embodiments of the invention, reference being made to the accompanying drawings in which:
Figure 1 is a perspective view of a tripod for mounting a film or video camera having legs which are extendible in two stages;
Figure 2 is a detailed view of a joint between two components of one of the legs including a locking device for locking the components in a required position of adjustment;
Figure 3 shows the components of a clamp in accordance with the invention for telescopically connecting one leg component comprising an outer pair of parallel tubes telescopically with another leg component comprising an inner pair of parallel tubes;
Figure 4 shows a modified version of a similar arrangement;
Figure 5 is a similar view to Figure 1 showing the clamp of the invention applied to another form of tripod; and
Figures 6 and 7 show a lower clamp on one of the legs of the tripod in greater detail.
Figure 1 of the drawings shows a conventional commercial camera tripod comprising a levelling bowl 10 to receive a bearing of a pan/tilt camera mounted in conventional manner. The levelling bowl has three hinge members 11 pivotally connected by pivot pins 12 to the bowl at spaced locations around the bowl to hinge three telescopically extending legs indicated at 13 to the bowl. Each leg is formed in three components telescopically connected together and comprising an upper component indicated at 14 consisting of a pair of widely spaced parallel tubes 15 and telescopically connected by a connector/clamp 16 to an intermediate component indicated at 17 comprising a pair of more narrowly spaced parallel tubes 18. The intermediate component 17 is, in turn, telescopically connected by a connector/clamp indicated at 19 to a single oval section tube 20. The lower ends of the tubes 20 are connected to the outer ends of a three-arm adjustable spreader 21.
Figure 2 of the drawings illustrates the connector/clamp 16 between the upper and intermediate components 13, 17 of the leg and comprises a bridge member 22 having an inner pair of bores 23 through which the tubes of the intermediate leg extend slidably and an outer pair of sockets 24 in which the lower ends of the outer pair of tubes 15 of the upper component are secured by adhesive.
A clamp 25 locks the upper and intermediate components of the leg together in any required position of adjustment. The clamp comprises a base 26 having a spaced pair of downwardly facing sockets 27 in which the upper ends of the parallel tubes 18 of the intermediate leg 17 are secured by adhesive to fasten the clamp to the upper end of the intermediate member. The clamp has a pair of parallel bores 28 through which the parallel tubes 15 of the upper component 14 of the leg are slidable.
As best seen in Figure 3, the clamp further comprises a pair of c-shaped clamping jaws 30 to receive and engage the parallel tubes 15. The jaws are interconnected by a bridging member 31 mounted on base 27 and with which one jaw of each C-shaped member is integrally formed to support the jaws spaced apart across the base with the open sides of the jaws facing towards each other. The other jaw of each C-shaped clamp has an outwardly projecting lug 32 and a clamping member 34 engages with the lugs 32 and is engaged by an adjustable rotary clamping device indicated at 35 mounted on the base. Rotation of the clamping device in one direction draws the clamping plate 34 towards the base and thereby closes the C-shaped jaws onto the tubes passing through the jaws to lock the.clamp to the tubes. Rotation of the device in the opposite direction allows the jaws to open from the tubes under the inherent resilience of the jaws to allow the tubes to slide through the jaws for adjustment of the tripod legs. It will be noted that the wall thickness of the C-shaped jaws reduces away from the open side of the jaws towards the location where the jaw is connected integrally to the bridging member 31 Thus the maximum flexing in the wall of the C-shaped member occurs in the region near the briding member and this provides a very rapid closure of the jaw onto the tube with the minimum amount of torque required.
In a further arrangement illustrated in Figure 4 of the drawings , the C-shaped jaws are separately mounted on the base, one being fixed to the base and the other being free to float over a limited movement with respect to the base towards and away from the other jaw to accommodate slight out alignment in the parallel tubes as they slide through the clamp to avoid binding of the tubes in the clamp.
The arrangement of Figures 5 to 7 is generally similar to that described with reference to Figures 1 to 4 of the drawings except that the single oval section tubes forming the lower most members of the legs are replaced by a pair of parallel tubes 40 which are telescopically engaged in the parallel tubes 18 of the intermediate legs above. In this arrangement the base 26 of the clamp 25 has sockets 27 in which the lower ends of the tubes 18 are secured and the C-shaped clamping jaws mounted on the base engage around the parallel tubes 40 of the lowermost leg member to lock the leg member in relation to the intermediate leg member 17.

Claims

CLAIMS :
1. A clamp for an extending leg comprising a base for mounting on one part of the leg a pair of resilient C-shaped clamping jaws mounted on the base with the axes of the jaws spaced apart parallel to one another to receive a pair of parallel circular cross-section members forming another part of the leg and means on the base acting on the jaws to close the jaws around the members to grip and lock the clamp to the members.
2. A clamp as claimed in Claim 1, wherein the C-shaped jaws are mounted on the base with the open sides of the Cs facing towards each other along the base.
3. A clamp as claimed in Claim 2, wherein the C-shaped jaws are connected together by a bridging member mounted on the base.
4. A clamp as claimed in Claim 3, wherein one end of each of the C-shaped jaws is formed integrally with the bridging member.
5. A clamp as claimed in Claim 4, wherein the other end of each C-shaped jaw has an outwardly projecting lug and said means to close the jaws acts on the projecting lugs.
6. A clamp as claimed in claim 5, wherein a device is mounted at the centre of the base between the jaws including a clamping member for engaging said lugs of the C-shaped jaws and means to draw the clamping member towards the base and thereby to close the jaws on the leg members.
7. A clamp as claimed in any of Claims 4 to 6, wherein the wall thickness of the C-shaped jaws reduces towards the regions of the jaws adjacent the bridging member to increase flexibility in those regions whereby the jaws are more readily closed on members extending through the jaws by the actionof the clamping member on the jaws.
8. A clamp as claimed in Claim 1, wherein one of the jaws is fixed on the base and the other is free to float over a limited range of movement with respect to sid one jaw to accommodate non-alignment in the members passing through the jaws.
PCT/GB1992/002302 1991-12-11 1992-12-11 Improvements in or relating to clamps for extending legs WO1993012372A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9126358.2 1991-12-11
GB9126358A GB2262306A (en) 1991-12-11 1991-12-11 Clamps for extending legs

Publications (1)

Publication Number Publication Date
WO1993012372A1 true WO1993012372A1 (en) 1993-06-24

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Application Number Title Priority Date Filing Date
PCT/GB1992/002302 WO1993012372A1 (en) 1991-12-11 1992-12-11 Improvements in or relating to clamps for extending legs

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AU (1) AU3092292A (en)
GB (1) GB2262306A (en)
WO (1) WO1993012372A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19617311A1 (en) * 1995-09-09 1997-03-13 Johannes Dr Thiel Net fence for trapping blown litter on landscaped site
DE19622894C1 (en) * 1996-06-07 1997-08-21 Sachtler Ag Telescopic frame with at least one frame leg
US6082685A (en) * 1996-06-07 2000-07-04 Sachtler Ag Telescopic stand
DE10244994A1 (en) * 2002-09-26 2004-04-15 Sachtler Gmbh & Co. Kg Multiple telescopic tube with load-dependent locking

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB277724A (en) * 1926-05-21 1927-09-21 Thomas Caygill Lennard Improvements in or relating to endless belt conveyors
CA2306869C (en) * 1997-10-20 2008-07-15 Autocue, Inc. Dual-stage quick release leg and tripod
DE29813362U1 (en) * 1998-07-27 1998-12-10 Shen, Hsin Sun, Keelung Prosthetic leg
US6286795B1 (en) 1998-10-20 2001-09-11 Autocue, Inc. Dual-stage quick release leg and tripod
GB2364756B8 (en) 2000-07-14 2017-06-14 Vitec Group Plc Improvements in or relating to methods of forming joints between elongate members and sockets
GB2366592B8 (en) 2000-09-06 2017-06-21 Vitec Group Plc Improvements in or relating to clamps for elongate members
EP1319885A1 (en) * 2001-12-14 2003-06-18 Michel Decorges Tripod for camera
GB2509514B8 (en) 2013-01-04 2017-06-07 Vitec Group Plc Improvements in or relating to extendible legs for tripods

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3405144A1 (en) * 1984-02-14 1985-08-22 Motorrad GmbH Scheibel, 8959 Rieden Clamping connection for fastening parallel tubes
DE3441225A1 (en) * 1984-11-10 1986-05-15 Dieter 8506 Langenzenn Groschupp Telescopic tripod stand
GB2246600A (en) * 1990-07-31 1992-02-05 Vinten Group Plc Improved clamp.

Family Cites Families (1)

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Publication number Priority date Publication date Assignee Title
AU531188B2 (en) * 1978-10-30 1983-08-11 Hewson, A.J. Clamp movable in several directions

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3405144A1 (en) * 1984-02-14 1985-08-22 Motorrad GmbH Scheibel, 8959 Rieden Clamping connection for fastening parallel tubes
DE3441225A1 (en) * 1984-11-10 1986-05-15 Dieter 8506 Langenzenn Groschupp Telescopic tripod stand
GB2246600A (en) * 1990-07-31 1992-02-05 Vinten Group Plc Improved clamp.

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19617311A1 (en) * 1995-09-09 1997-03-13 Johannes Dr Thiel Net fence for trapping blown litter on landscaped site
DE19622894C1 (en) * 1996-06-07 1997-08-21 Sachtler Ag Telescopic frame with at least one frame leg
EP0813021A1 (en) * 1996-06-07 1997-12-17 Sachtler AG Telescopic support
US5887835A (en) * 1996-06-07 1999-03-30 Sachtler Ag Telescopic stand
AU709257B2 (en) * 1996-06-07 1999-08-26 Camera Dynamics Gmbh A telescopic stand
US6082685A (en) * 1996-06-07 2000-07-04 Sachtler Ag Telescopic stand
AU709257C (en) * 1996-06-07 2002-07-25 Camera Dynamics Gmbh A telescopic stand
JP3483731B2 (en) 1996-06-07 2004-01-06 ザハトラー・アーゲー Telescope type stand
DE10244994A1 (en) * 2002-09-26 2004-04-15 Sachtler Gmbh & Co. Kg Multiple telescopic tube with load-dependent locking
WO2004031596A1 (en) * 2002-09-26 2004-04-15 Sachtler Gmbh & Co. Kg Multiple telescopic tube comprising a load-controlled locking device
DE10244994B4 (en) * 2002-09-26 2005-10-27 Sachtler Gmbh & Co. Kg Multiple telescopic tube with load-dependent locking
CN100412436C (en) * 2002-09-26 2008-08-20 照相机动力学有限公司 Multiple telescoping tubes including load control locking device

Also Published As

Publication number Publication date
GB2262306A (en) 1993-06-16
GB9126358D0 (en) 1992-02-12
AU3092292A (en) 1993-07-19

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