Tripod for supporting apparatus in general and, in particular, for optical or photographic apparatus and the like

A tripod for supporting apparatus in general and, in particular, for optical or photographic apparatus, comprising:

• a spider having a through-hole formed through the spider;
• legs each articulated to the spider by a respective first section, a respective appendage projecting radially from an end of the first section, without occupying space inside the section;
• a pillar having a stem with first and second ends and being housed slidably with the stem in the through-hole formed through the spider;
• means for locking the sliding of the pillar, the locking means including a brake acting on the pillar;
• a head adapted to receive the apparatus, the head being at least partially housed inside the through-hole when the tripod is in its fully retracted and most compact condition and the head having a spherical element and a collet housed inside the stem in the region of the first end of the stem, the collet engaging the spherical element in order to clamp it selectively, relative to the stem, so that the head is connected to the first end of the stem;
• and
• means for adjusting the orientation of the head, the adjustment means being fixed to the second end of the stem, axially remote from the first end.

A tripod for supporting apparatus in general and, in particular, for optical or photographic apparatus, comprising:

• a spider having a through-hole formed through the spider;
• legs each articulated to the spider by a respective first section, a respective appendage projecting radially from an end of the first section, without occupying space inside the section, the appendage formed integrally on a sleeve fitted firmly on the first section, each appendage being housed in a respective seat formed in the spider for the articulation of the leg, the appendage and the seat being provided with respective complementary restraining means for restraining axially the appendage, while allowing the appendage to rotate, in the seat;
• a pillar having a stem with first and second ends and being housed slidably with the stem in the through-hole formed through the spider;
• means for locking the sliding of the pillar, the locking means including a brake acting on the pillar, the brake having an operating lever terminating in a cam-like eccentric element operating on a pad movable radially in a seat formed in the spider in a manner such that the pressure of the pad on the pillar is determined by the position of the operating lever;
• a head adapted to receive the apparatus, the head being at least partially housed inside the through-hole when the tripod is in its fully retracted and most compact condition and the head having (a) a spherical element and a collet housed inside the stem in the region of the first end of the stem, the collet engaging the spherical element in order to clamp it selectively, relative to the stem, so that the head is connected to the first end of the stem, and (b) a ring nut mounted on the spherical element and such that, when the tripod is in the fully retracted condition, the ring nut is in abutment with the spider and the spherical element is housed inside the through-hole;
• a sleeve with a frustoconical opening, driven into the first end of the stem, the collet being housed inside the sleeve and cooperating with the frustoconical opening for the clamping of the spherical element;
• means for adjusting the orientation of the head, the adjustment means being fixed to the second end of the stem, axially remote from the first end, the adjustment means including (a) a tie rod having first and second ends and being associated, via the first of its ends, with the collet in order, when tensioned, to lock the relative rotation of the spherical element inside the collet, and (b) a knob in abutment with the second end of the stem, the tie rod being disposed inside the stem and being connected, via the second of its ends, to the knob, for the adjustment of the tensioning of the tie rod, the knob having a female thread and the second end of the tie rod being threaded to engage the female thread by screwing, so that rotation of the knob varies the tensioning of the tie rod and consequently the clamping of the collet onto the head, and (c) a guide bush driven into the second end of the stem, the tie rod being guided in the guide bush in a non-rotatable manner;
• and
• axial preloading means provided on the tie rod, so that the tie rod is tensioned, even when the knob is fully slackened, ensuring a minimal clamping of the collet onto the spherical element, the preloading means comprising a spring interposed between the tie rod and the guide bush.