Handling: hand and hoist-line implements – Magnet
Patent
1980-06-06
1982-06-15
Cherry, Johnny D.
Handling: hand and hoist-line implements
Magnet
B66C 106
Patent
active
043347088
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an electromagnet for moving iron objects.
The electromagnet is primarily intended for use in automatically handling objects arranged in no particular order. Examples of such handling are the transfer of iron objects from one transport pallet to another, from a pallet to a conveying path, and from such a path to a machine tool, or the reverse.
For moving iron objects with the electromagnet, the device has been given the characterizing features disclosed in the appended patent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the electromagnet in accordance with the invention is illustrated in the accompanying drawings, in which FIG. 1 illustrates the electromagnet as seen at an angle from above, and FIG. 2 illustrates the magnetic heads with their windings, as seen from one side. The embodiment illustrated on the drawings will now be described in detail.
DETAILED DESCRIPTION OF THE INVENTION
The electromagnet in accordance with the invention is provided with two opposing magnetic heads M.sub.1 and M.sub.2. Each of these is provided with at least one electric winding A.sub.1, A.sub.2, respectively. The heads M.sub.1, M.sub.2 are connected to each other via a carrying shaft 1.
The magnetic heads M.sub.1, M.sub.2 of the electromagnet shown in the drawings are furthermore provided with a second electric winding B.sub.1 and B.sub.2, respectively.
The magnetic heads M.sub.1 and M.sub.2 are formed one to the opposite hand of the other. Each is provided with two opposing pole plates, an outer pole plate 2, 3 and an inner pole plate 4, 5. On the respective magnetic head M.sub.1, M.sub.2 the outer pole plate 2, 3 and the inner pole plate 4, 5 are mutually attached by a cylindrical core 6. Electrical windings A.sub.1, B.sub.1 and A.sub.2, B.sub.2 for the respective magnetic head M.sub.1, M.sub.2 are wound on the respective core 6.
The ends of the carrying shaft 1 connecting the magnetic heads M.sub.1, and M.sub.2 with each other are provided with ball joints, attached to the core 6 of the respective magnetic head M.sub.1, M.sub.2.
On the respective magnetic head M.sub.1, M.sub.2 the inner pole plate 4, 5 is formed with an aperture 7 directly opposite the cylindrical core 6. Said aperture opens out onto the core 6 where the ball joint is attached, and the carrying shaft 1 runs through the aperture 7 to the ball joint. The diameter of the aperture 7 is relatively large compared with the cross section of the carrying shaft 1, so that the magnetic heads M.sub.1 and M.sub.2 can assume positions at approximately 90.degree. in relation to each other for ensuring that a planar surface at the edges of the pole plates 2, 4 and 3, 5 on the respective magnetic head M.sub.1 and M.sub.2 can be tipped into engagement against the surface of an iron object to be lifted by the electromagnet. By attaching the magnetic heads M.sub.1 and M.sub.2 to the carrying shaft 1 by ball joints, they are also turnable, so that a suitable portion of the edges of the pole plates 2, 4 and 3, 5 are turned into engagement against the iron object which is to be lifted by the electromagnet.
Turning and tipping the magnetic heads M.sub.1 and M.sub.2 is done when the windings A and B are connected to their current sources and the heads M.sub.1 and M.sub.2 are adjacent the iron object to be lifted.
An attachment 8 for a steel cable 9 is arranged at the middle of the carrying shaft 1. The magnetic heads M.sub.1 and M.sub.2, mounted at the ends of the carrying shaft 1, are raised and lowered with the help of the cable 9. The cable 9 goes to a point of support on a suspension means (not shown on the drawings) for the electromagnet. Raising and lowering the electromagnet is carried out by this suspension means.
Through the suspension of the electromagnet there will be, during a lift, a vertical line through the suspension point of the wire 9 in the suspension means, this line passes practically straight through the center of gravity for the magnetic heads M.sub.1 and M.sub.2 and the iron object
REFERENCES:
patent: 1200404 (1916-10-01), White
patent: 1228690 (1917-06-01), Monnet
patent: 3596967 (1971-08-01), Carter
patent: 4129328 (1978-12-01), Littell
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