Theatrical lighting clamp

Details Theatrical lighting clamp Theatrical lighting clamp

1995-11-16

1998-07-07

Ramirez, Ramon O.

Supports

Brackets

Specially mounted or attached

33783, E04G 300

Patent

active

057756520

ABSTRACT:
A quick release clamp (10) for mounting equipment such as a lighting instrument (60) on a structural member such as a pipe (36). The clamp includes a C-shaped body (12) having a jaw portion (16), a back portion (14) and a base portion (18), the jaw and base portions extending from the back portion in spaced opposing disposition. The base portion defines an adjustment aperture (22) that is formed with an internal interrupted thread (24). An elongate tubular coarse adjustment sleeve (26) defines an internal threaded central passage (28) and an external interrupted thread (30) corresponding to the internal interrupted thread of the body. The sleeve is receivable within the adjustment aperture of the body and rotatable about a longitudinal axis of the sleeve into a first position, in which the sleeve is freely movable longitudinally within the adjustment aperture, and a second position, in which the external interrupted thread of the sleeve engages and locks within the internal interrupted thread of the body to prevent longitudinal movement of the sleeve. An elongate fine adjustment bolt (34) is coaxially and threadably received within the sleeve, and is rotatable within the sleeve to project a selected amount through the sleeve towards the jaw and back portions of the body. The base portion of the body also defines a mounting passage (38) which receives the neck (42) of a mounting spigot (40) secured therein. The mounting spigot defines an elongate T-slot (52). A T-stem (58) has a T-shaped head (62) that is slidably insertable into the T-slot of the spigot through an open first end (54) of the T-slot. The head of the T-stem is selectively secured within the T-slot of the spigot by a spring-loaded latch (66) and nut (68) carried on the stem of the T-stem. The lighting instrument is secured to the stem (64) of the T-stem, and may be rapidly connected and detached from the clamps.

REFERENCES:
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Photocopy of clamp manufactured by Manfrotto, Italy, purchased Jan. 1996. Clamp includes clamp body (A), threaded adjustment bolt (B), and spring-loaded release button (C) which when depressed allows bolt (B) to slide freely.
Pacific Northwest Theatre Associates, Inc., "PNTA Stage & Studio Supplies, DOGALOG 1995-96," Lighting Hardware.
"GRAINGER.RTM. Industrial and Commercial Equipment and Supplies, 1995 General Catalog No. 386," (1995).
Carr Lane Manjfacturing Co., "Component Parts of Jigs and Fixtures USA & Metric" (1994).

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