Supports – Resilient support – Including load sustaining bearing or guide
Patent
1981-04-09
1984-07-17
Schultz, William H.
Supports
Resilient support
Including load sustaining bearing or guide
F16M 1300
Patent
active
044601484
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a balancer for movably supporting an operating machine above a work table, especially a balancer in which several kinds of operating machines having different weights can alternatively be mounted without exchanging a spring assembled in the balancer.
BACKGROUND OF THE INVENTION
Conventionally, in Japanese patent application No. 1975-117039 by a third party, such a balancer has already been proposed which comprises a horizontal supporting shaft arranged on a column, a beam, one end of which is connected to the beam, a hook arranged at the other end of the beam, an expansible spring member located higher than the supporting shaft and extending between the intermediate portion of the beam and the top portion of the column, so that the position of the action point of the spring member is adjustable on the beam. However, a strong force moment is loaded on the beam itself in such balancer; therefore the beam should be constructed in especially high strength, which causes an increase in cost of the balancer.
DISCLOSURE OF THE INVENTION
This invention is performed to solve the conventional problem stated above by loading the strong elastic force of a spring onto the end portion of a beam by means of a pulling member such as a wire, chain, or the like without loading the force of the spring directly onto the beam. The primary object of the present invention is to provide a balancer comprising a first bracket rotatable around a vertical axis; a first parallel link unit inclinable upwardly and downwardly in a vertical plane containing the rotating axis of the first bracket and located in front of the bracket; a second parallel link unit supported by a second bracket at the front end of the first parallel link units and swingable in the vertical plane located under the second bracket; a third bracket mounted at the lower end of the second parallel link unit for holding an operating machine; an arm supported by the first bracket by means of a horizontal shaft extending perpendicularly to the vertical plane; a pulling member extending forwardly from a rear end thereof connected to the arm, passing over the faced peripheries of two adjacent front and rear guide wheel means, extending downwardly from the guide wheel means, and being connected to the portion of the second parallel link unit spaced from and located under the second bracket; a bolt rotatably supported by the arm, said bolt extending lengthwisely with respect to the arm, and being provided with a handle; a shiftable nut on the bolt; and a spring loading the shiftable nut with elastic force for pulling the pulling member; said nut is shifted by turning the handle, thereby the balancer is balanced.
Other objects and advantages of this invention will be apparent from the following description of a preferred embodiment thereof, reference being had to the accompanying drawings.
BRIEF DESCRIPTION OF THE FIGURES OF THE DRAWING
FIG. 1 is a schematic view in top plane showing a balancer on an operating table according to this invention.
FIG. 2 is a fragmentary side view of the balancer shown in FIG. 1.
FIG. 3 and FIG. 4 are fragmentary section views taken along lines III--III and IV--IV respectively in FIG. 2.
PREFERRED EMBODIMENT OF THE INVENTION
Referring to FIG. 1, an arrow F' indicates forward direction, and cloth 2 is unrolled by an unrolling machine (not shown) from cloth roll and stacked over a work table 1. At 3 is indicated a carriage. Two wheels 4 mounted on right side of the bottom of the carriage 3 mesh with a rail 5 along a side of the table 1, and two left rubber wheels 6 merely ride on the table 1 without meshing. The carriage 3 is provided with a vertical column 7 at the center thereof, and a balancer 8 is mounted at the top of the column 7. At the end of the balancer 8, a cutting machine 9 (operating machine) is supported which is balanced in its vertical position by the balancer 8. An operator can cut the cloth 2 by moving the cutting machine 9 along the surface of the table 1 by a handle
REFERENCES:
patent: 2299251 (1942-10-01), Perbal
patent: 2675985 (1954-04-01), Boiteux
patent: 2833504 (1958-05-01), Sacksteder
patent: 3285562 (1966-11-01), Langer
patent: 3543019 (1970-11-01), Jacobsen
patent: 4003536 (1977-01-01), Sekerich
patent: 4166602 (1979-09-01), Nilsen
patent: 4266747 (1981-05-01), Souder
patent: 4296906 (1981-10-01), Matthijsse
patent: 4344595 (1982-08-01), Heller
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