Material or article handling – Apparatus for moving material to a position in the erection... – Flat wall or ceiling member manipulating means
Patent
1996-07-15
1997-07-01
Merritt, Karen B.
Material or article handling
Apparatus for moving material to a position in the erection...
Flat wall or ceiling member manipulating means
414590, 414737, E04G 2114
Patent
active
056429754
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for fitting shop windows.
A first type of existing device for fitting shop windows consists of a low, narrow cart on four wheels, including two pivoting wheels, enabling a window to be placed vertically inside the cart, the vertical posts of which grip the lower parts of the window while supporting a large portion of the weight. Held manually by two window fitters using vacuum suction means, the window is wheeled towards its frame and positioned in parallel, then hoisted by hand on to previously positioned shims.
There also exist known truck-mounted hydraulic cranes whose motions are of a circular type because of the action of the jacks close to the rotation hubs. These systems therefore cannot be used to bring a window to less than some centimeters from its frame. Furthermore, there can be little control over the precision of the hydraulic motions (through control over the slowness of the starting, stopping and lowering of the tensioned arm).
Apart from this lack of precision in their motions, hydraulic cranes have other drawbacks: for fitting at close quarters, depending on the weight of the window, frame before it is fitted in, subsequently entailing the drawback of difficult and dangerous shim-adjusting operations. The result thereof may be that the windows may crack either through thermal shock or because they have a curvature with respect to the frame that is difficult to correct in each of the two planes, pavements or steps between the hydraulic machines and the window frames, elbow of the hinged arm of the cranes when there are balconies, projections whose lower part is close to the top of the frames of the windows to be replaced, because of narrow or excessively wide streets, trees and/or urban fixtures that form obstacles to them, has been hitherto able to work with actually and/or durably in submillimetrical motion without the risk of breakage of glass, are also detrimental.
OBJECTS AND SUMMARY OF THE INVENTION
Hence, the aim of the present invention is to overcome the above-mentioned drawbacks by proposing a shop window fitting device that enables work to be done with only one person in all safety and independence, and with all precision and especially with the slowness required when the window is on the verge of being fitted.
This aim is achieved, according to the present invention, by the fact that said device comprises: translation means, translation of the ram positioned at the top points of said hoisting means, axis of said ram and secondly about an axis parallel to the direction of the motion of the hoisting means.
Thus, the device of the invention can be handled by only one hand. Its starting torque is such (less than 15 Newtons) as to enable the performance and control of ascending, transversal or lateral motions of about a quarter of a millimeter.
Advantageously, it is provided in the invention that said hoisting means will each be formed by a vertical mast comprising a worm screw that has its rotation blocked at least at one end and that is movable only in axial translation under the effect of a nut-operated lifting unit.
Similarly, according to a preferred embodiment of the invention, said ram has a worm screw whose rotation is blocked, forming means of axial translation with at least one nut-operated device.
Finally, it is also provided that said independent means for the transversal translation of the ram each comprise a worm screw device perpendicular to the ram, driving at least one nut fixedly joined to said ram in transversal translation.
This mechanical design of the device according to the invention, based on the use of worm screws, for operation in all three dimensions, certain uses being compelled in linear motion, makes it possible to obtain a condition where the vertical motions as well as the horizontal motions work smoothly together in parallel as well as in opposition. It is possible, for example, to produce a circular motion to correct the declivity of roads.
The applicant has estimated that the
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Hess Douglas
Merritt Karen B.
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