FR2546268A1 - IMPROVEMENTS IN SPACERS WORKING IN TENSION, ESPECIALLY FOR SHORT-SIDED LEG TRIPODS - Google Patents

Abstract

SPACER THAT MOUNTS BETWEEN A PLATFORM AND A TRIPOD LEG OR SIMILAR DEVICE. THE SPACER CONTAINS MEANS WHICH GENERATE OPPOSING FORCES OF TENSION 11 AND COMPRESSION 4, 7 WHICH, WHEN THEY ARE COMBINED, GIVE A REACTION FORCE SENSITIVELY EQUAL TO THE FORCE TENDING TO START THE LEG.

Description

Improvements made to working spacers

  in tension, especially for tripods deviate legs.

  The present invention relates to

  voltage gauges and, more particularly, but not exclusively, to usable voltage

  on tripods with wide legs.

  In the field of spreadable legs such as those used on tripods, etc., one of the main difficulties encountered concerns

  the separation of the legs without causing the fall of

  foot and / or legs The usual method is to provide each leg with a locking device or

  which must be tightened or released at each

  each leg If this device is not correct

  applied to each leg of the tripod after

  The tripod assembly may collapse and damage to valuable equipment mounted on the tripod often occurs. Various types of standoffs, such as the legs and the tripod platform, have been tried. telescopic spacers

  equipped with locking tongs, lanterns, and

  articulated toises, but all these processes require

  time, annoy the user and are often nervous-

  difficult when expensive equipment is mounted

on the tripod.

  The subject of the present invention is therefore

  a spacer that can be used on such a treasure

  foot, allows the angular adjustment of the legs, reduces the risk of collapse of the tripod and, under the worst conditions, when the load on the tripod is too heavy, slowly sinks along a line substantially vertical, to the position

  total distance of all legs.

  According to the invention, a spacer is obtained for a tripod leg or the like, which comprises a

  outer tube comprising pivoting fastening means

  at one end, an inner tube longer than the outer tube, movable longitudinally in the latter and having pivoting fastening means at its open end and a piston provided for its

  closed end and which can slide longitudinally-

  in the outer tube, sealing means provided on the outer tube at its open end, in sliding contact with the inner tube, and a

  elastic cord arranged inside the inner tubes

  inside and outside to connect their ends.

  The invention is described below, as

  example only, with reference to the drawings

  nexés in which: Figure 1 is a section of a spacer according to the invention, in the closed position;

  FIG. 2 represents a spacer, in ex-

  partial tension and in full extension; and

  Figure 3 is a graph of the force exerted

  elastic rope, the force exerted by the

  piston and the approximate force required,

distance of the leg.

  Referring to Figure 1 A tube 1, on the-

  which is fixed a plug 2 with venting port

  phère, comprises a fastener 3 for the pivotal attachment

  te of the tube 1 at a point A which defines a position

  mounting the spacer on a platform of

  foot, not shown The broken line BC represents

  feels a tripod leg, pivotally attached

  at point B on the tripod platform.

  4, for example an O-ring or a compressed felt, is housed in a groove formed in the bore of the tube 1, near the open end of the tube 1 The lining 4 is in sliding contact on an inner blade 5 having a shoulder 6 which fits slidably in the bore of the tube

  outside 1 The shoulder 6 defines a piston on the-

  what can be placed a sealing device or

  ring 7, so that when extending the

  toise, the air contained in the chamber 8 is compressed.

  In the opposite end of the inner tube 5 is mounted

  a plug 9 with venting orifice, comprising

  both a clip 10 for the pivotal attachment of the

  tretoise, in its rest state, at a point D on the leg of the tripod A length of elastic rope 11, also called shock rope or shock absorption rope, extends inside the tubes 1 and 5 and it is attached to the pierced cap of the inner tube, at one end and the pierced cap of the outer tube, at its other end, so that when the spacer is in the closed position, the elastic cord

He is relaxed.

  Referring now to Figures 2 and 3.

  The legs of the tripod, of which only one is shown, are partially apart and the inner tube 5, which pivots in D, is partly out of the outer tube

  1 The elastic cord 11 is now under a certain

  voltage and air in room 8 under a certain

  The combined effect of the forces of

  compression and compression prevents the leg from going to bed until it is fully apart, shown as a dotted line Plus the degree of separation of the leg

  is large, the greater the forces of tension and compres-

  are shown in Figure 3, in which the curve X represents the approximate reaction force due to the compression of the air and the curve Y represents the approximate reaction force due to the tension of the elastic rope, the curve Z

  represents the approximate balancing force required

  and it corresponds substantially to the reaction force

  The weight placed on the tripod platform, which tends to spread the legs, is balanced by the force which tends to close the spacer and these forces are substantially proportional in any other way. the distance range, that is to say that the forces acting Pl are balanced and it is the same in P 2 'Although it is very stable, the spacer may also include a locking device , so that during extended periods of use

  in a spacing position, the spacer is doubly

  The blocking device can take many forms. A preferred device is the so-called split block type, which can be clamped to a portion of the inner tube and is normally attached to the open end of the outer tube. fast for such split blocks are

well known.

  The use of this type of spacer for

  legs of a tripod or similar system

  the risk of damage to the equipment mounted on the tripod platform and the spacers on the legs of the tripod substantially balance the weight of an object placed on the tripod platform;

  any angle of separation of the legs.

Claims (4)

  1 Spacer for a tripod leg or disc   similar positive, characterized in that it comprises an outer tube (1), comprising means (3) for pivotally fastening at one end; an inner tube (5), larger than the outer tube (1) and longitudinally movable in the latter, comprising   pivoting fastening means (10) at its end   covered and a piston (6) at its closed end, this piston being able to slide longitudinally in the   outer tube (1); sealing means (4) pre-   seen on the outer tube (1) at its open end, in sliding contact with the inner tube C 5); and an elastic cord (11), placed inside the   inner and outer tubes and connecting their ends   moth-eaten. Spacer for a tripod leg or the like according to claim 1, characterized in that   the piston (6) has a segment or an plunger (7).   3 Spacer for a tripod leg or   analogue according to claim 1 or 2, characterized   in that the sealing means (4) are fixed   inside the outer tube (1).   4 Spacer for a tripod leg or   analog according to any one of the claims   preceding, characterized in that the elastic cord   that (11) is in the relaxed state when the tubes   outside and outside are not in extension.   Spacer for a tripod leg or   analog according to any one of the claims   preceding, characterized in that, in operation, the resultant force generated by the combination of the elastic cord (11) and the compression of the air is close to the required force, at any chosen angle of separation of the leg, to maintain the position   an object and the tripod platform.