Optics: motion pictures – With support
Patent
1996-09-26
1999-01-05
Malley, Daniel P.
Optics: motion pictures
With support
B66C 2354
Patent
active
058568620
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to machines for lifting loads, and in particular to machines to be used for movement of a camera during film-or television-program shooting.
A camera crane is known (RU-A-2,028,271) which has a boom arranged on a support so as to be turnable in vertical and horizontal planes and composed of at least two parts connected with one another by additional couplings. The crane also has a cantilever with a system of crane boom mass compensation (the counterbalance), central and lateral struts with rope pulleys on their end, and tension wires extending around the pulleys and having first ends connected with tensioning mechanisms arranged on the end of the cantilever and second ends connected with the additional couplings.
The device disclosed in this reference has a disadvantage that the camera arranged on the crane can be moved only in the vertical and horizontal planes so as to follow all movements of the end of the crane boom. Therefore, it can not provide use which are necessary for shooting an object located within a hemisphere circumscribed by an end of a crane boom radius.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a device which makes possible shooting an object at any point within the hemisphere circumscribed by the end of the crane boom radius.
In keeping with these objects, one feature of the present invention resides, briefly stated, in a boom camera crane, which has a support, a boom arranged on the support end and turnable in vertical and horizontal planes, and an additional carriage arranged on the boom for supporting a camera and reciprocatingly movable along the boom.
When the device is designed in accordance with the present invention, it elements the disadvantages of the prior art. The mass center of the boom is kept constant relative to its hinge for turning in a vertical plane, while the camera reciprocatingly moves along the boom of the crane.
The carriage with the camera can be connected by a rope-pulley system with a counterbalance arranged on rollers inside the hollow crane boom, with portions of outer and inner boom surfaces operating as guides for the carriage rollers and counterbalance rollers along the whole length of the boom.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view of a boom camera crane in accordance with the present invention; and
FIG. 2 is a view showing a section of a crane boom of the inventive boom camera crane, taken along the line A--A.
DESCRIPTION OF PREFERRED EMBODIMENTS
A boom camera crane in accordance with the present invention has a support 1 provided with a fixed base 2. A column 3 is connected with a support 1 by a bearing unit 4 so that the column 3 can turn around a vertical axis of the support 1. A central section 5 is turnably mounted on the column 3 through a bearing unit 6 for turning in a vertical plane. A cantilever 7 is connected with one end of the central section 5 and provided with a counterbalance 8 or a boom mass compensation element. A tensioning mechanism 9 is arranged on the cantilever 7 as well.
Several sections of an assembled hollow boom 11 are attached to the other side of the central section 5 by connecting couplings 10. The crane has central struts 12 and lateral struts 13. The free ends of the struts are provided with guides 14 for laying of tension wires 15. The tension wires 15 have one end fastened to the connecting couplings 10 and another end fastened to the tensioning mechanisms for tensioning the central and lateral tension wires 16 and 17 correspondingly.
The boom 11 is formed as a hollow element which can be
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patent: 4113112 (1978-09-01), Ray
patent: 4303166 (1981-12-01), Campbell et al.
patent: 4363411 (1982-12-01), Blair et al.
patent: 4685649 (1987-08-01), McKay
patent: 5033705 (1991-07-01), Reagan
Malley Daniel P.
Zborovsky Ilya
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