Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Reexamination Certificate
2000-07-14
2001-10-30
Barrera, Ramon M. (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
C335S258000, C335S273000
Reexamination Certificate
active
06310530
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a device for emergency hand operation with switching magnets. The armature can be moved in the pole pipe into one final position by the force of a spring assembly and can be moved into a second final position by magnetic field excitation against the force of the spring assembly. A tensioning member is axially slidable in the pole core, can be moved by means of a manual actuating device, and has a carrier cooperating with the armature to move the armature counter to the force of the spring into its second final position.
BACKGROUND OF THE INVENTION
Devices, known as “tensioning” switching magnets, serve as security devices which facilitate manual engagement when, for example, during breakdown of the magnetic field excitation or during a mechanical blockade despite magnetic field excitation, no movement of the armature occurs counter to the effective spring force. The ability to manually move the armature in such events is particularly advantageous, especially when the relevant switching magnet serves in hydraulic installations for the actuation of a multi-way valve for the control of the pressure oil supply, for instance, for use in a press or in a working cylinder. In such environments, it is essential to avoid danger, so that in emergency situations the pressure oil supply can be retained manually.
Known devices of this type, as disclosed in DE 33 17 226 A1, have complicated constructions and have relatively great numbers of individual component parts. Another drawback resides in that because of the great number of individual parts and because of the conditions under which the pole pipe must be mounted with construction of devices on both sides, a higher cost of assembly occurs.
SUMMARY OF THE INVENTION
Objects of the present invention are to provide a device for the emergency manual operation, which is a considerable improvement over known devices because of simpler construction and considerably lower outlay for its assembly.
With the device according to the present invention these objects are attained by the armature, the pole core, the spring assembly, the tensioning member and the actuating device being combined in the form of a modular unit. That modular unit can be inserted into the pole pipe through its inner open end and can be connected with the pole pipe.
Both the operational elements for the emergency hand operation and the spring assembly effecting the armature are integrated into the pole core. On the one hand, a compact structure is obtained with as small as possible number of individual component parts. The armature cooperating with the tensioning member likewise is a component part of the prefabricated structural unit. On the other hand, the advantage of simplified assembly is obtained, because the structural unit need be inserted from only one open end into the pole pipe.
The connection with the pole pipe in this case is of particularly simple construction, when the pole core has an annular groove worked into its periphery and can be connected by rolling or folding the end of the pole pipe into the annular groove flange-like or bead-like therewith.
With one preferred exemplary embodiment, the operating device can have a threaded bolt as settling member for the axial slide movement of the tensioning member. The bolt cooperates with an interior threaded segment of an axial bore in the pole core forming a guide for the tensioning member.
With such an embodiment, the emergency operation can occur in a convenient and secure manner by manual revolution of the threaded bolt. This bolt can have a screw head accessible at the open end of the pole core, which, for example, can be provided with peripheral milling or beading.
Preferably, the tensioning member is configured as a one-piece extension of the threaded bolt. The bolt extends through the inner end of the pole core outward into an axial bore embodied in the armature.
Preferably, the extension of the threaded bolt forming the tensioning member, which extends through a sealing arrangement found in the axial bore of the pole core, passes through into the axial bore embodied in the armature, and has a tapered outside diameter as compared with the other and proximate part of the threaded bolt. Thus, an emergency operation can also be easily executed against high working pressures which are being generated.
The assembly is particularly simple if a milled or beaded edge is provided and formed facing outward in the free or open end of the extension of the tensioning member. Such a construction of the free or open end of the tensioning member can be produced particularly simply during the assembly, if the free end of the tensioning member has an axial pocket construction. Following the assembly of the individual component parts of the modular unit-like structural unit, the opening of the pocket construction is formed as a milled or beaded folded back edge opening outward.
Other objects, advantages and salient features of the present invention will become apparent from the following detailed description, which, taken in conjunction with the annexed drawings, discloses a preferred embodiment of the present invention.
REFERENCES:
patent: 3900810 (1975-08-01), Grenier
patent: 4544128 (1985-10-01), Kolchinsky et al.
patent: 4871989 (1989-10-01), Gross
patent: 5271599 (1993-12-01), Kolchinsky et al.
patent: 5842679 (1998-12-01), Kolchinsky
patent: 32 43 999 (1984-05-01), None
patent: 33 17 226 (1984-11-01), None
patent: 92 00 549 (1992-03-01), None
patent: 0 242 557 (1987-10-01), None
Barrera Ramon M.
Hydac Electronic GmbH
Roylance Abrams Berdo & Goodman L.L.P.
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