Electromagnetic contactor for battery powered vehicles |
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| 申请号 | US35276773 | 申请日 | 1973-04-19 | 公开(公告)号 | US3815060A | 公开(公告)日 | 1974-06-04 |
| 申请人 | SQUARE D CO; | 发明人 | TURNBULL M; | ||||
| 摘要 | A compact contactor for a battery operated lift truck. The contactor may be mounted in either of two positions and has its terminals arranged so it can be easily connected in a reversing circuit for a motor. The contactor includes a novel movable contact support which is molded in situ with a magnet plunger. The movable contact support completely isolates the springs for the movable contacts from the switching areas of the contactor and provides a guide for the movements of the plunger. The support for the stationary contact is arranged to position the terminals of the contactor so the contactor is easy to wire and permit a range of different sized contacts to be mounted on the support and electrically connected by a pair of metal members. | ||||||
| 权利要求 | 1. In a D.C. operated electromagnetic switch the combination comprising: a frame having a pair of spaced ends and portions interconnecting the ends providing a path for magnet flux passing through the ends, a magnet coil positioned between the ends, said magnet coil having a cylindrical passage axially aligned with an opening in a first of the pair of ends and a coil winding surrounding the passage, a plunger having a cylindrical portion movable in the passage and a portion extending through the opening to a free end and a cavity in the plunger extending from the free end axially into the cylindrical portion, an insulating support mounted on the first end, said insulating support having an opening extending therethrough axially aligned with passage, and a pair of spaced stationary contacts mounted on a front surface of the support on opposite sides of the opening, and an insulating movable contact carrier having a portion extending through the opening in the support and a portion molded in situ in the cavity 2. The combination as recited in claim 1 wherein portions of the contact carrier engage portions of the block surrounding the opening in the block for preventing rotation of the plunger in the passage. 3. The combination as recited in claim 1 wherein the carrier and plunger have axially aligned bores extending therethrough. 4. The combination as recited in claim 3 wherein the portion of the carrier extending through the opening has an end providing movable contact support surface that extends in a plane normal to the axis of the bore through the carrier and a movable contact is positioned on the contact support surface to provide a bridging engagement with the stationary contacts. 5. The combination as recited in claim 4 wherein the cross-sectional area of the bore at the end providing the movable contact surface is reduced to provide a spring seat and the movable contact is positioned on the contact surface by a member that has an end extending through the reduced portion of the bore and through an opening in a central portion of the movable contact. 6. The combination as recited in claim 4 wherein the member has an enlarged end movable in the bore in the contact carrier and a spring is positioned between the enlarged end and the spring seat. 7. The combination as recited in claim 6 wherein the enlarged end is movable along the walls forming the bore with a piston-like action. 8. The combination as recited in claim 7 wherein the portion of the plunger providing the free end includes a pair of ears extending from said portion normal to the axis of the passage and said first end includes a pair of non-magnet stop surfaces that are engaged by the ears to limit the movement of the plunger in one direction when the coil is energized by direct current. 9. A reversing diRect current contactor assembly comprising: a pair of identical electromagnetically operated switches, each of said switches including: an electromagnet comprising a frame having a rear end, a front end, and portions connecting the rear end and the front end providing a path for magnet flux passing through said ends, a magnet coil positioned between the ends, said coil having a cylindrical bore extending along a first axis with a front end of the bore aligned with a circular opening in the front end of the frame and a coil winding surrounding the cylindrical bore, and a cylindrical plunger having a rear end portion movable in the bore and a front end portion extending through the opening in the front end of the frame, an insulating stationary contact support secured on the front end of the frame, said support having a passage extending therethrough aligned on the first axis, an insulating movable contact carrier extending through the passage, said carrier having a rear end secured to the front end of plunger and a movable contact support surface at a front end of the carrier disposed forwardly of a front surface of the support, an elongated movable contact mounted on the support surface, said movable contact having a central portion centered on the first axis and portions extending in opposite directions from the central portion along a second axis that is perpendicular to the first axis, means for positioning the pair of switches so the second axis of the respective switches are aligned in a plane through the first axis of both switches with the switches spaced equidistantly from a third axis that extends perpendicular to the plane so a side on the stationary contact support of a first of the pair of switches confronts a side on the stationary contact support of a second of the pair of switches with the confronting sides extending parallel and in spaced relation to the third axis, each of said switches including a pair of stationary contact assemblies mounted on a portion of the front surface of the support most proximate the third axis, a first of said pair of contact assemblies including a metal support having a mounting portion secured to portion of a corner of the front surfaces of the support adjacent the confronting sides and a side of the support that is spaced from a first side of the plane and a contact support portion extending from the mounting portion along an axis parallel to the third axis to a free end, a second of said pair of contact assemblies including a metal support having a mounting portion secured to a portion of a corner of the front surface of the support adjacent the confronting side and a side of the support that is spaced from a second side of the plane and a contact support portion extending from the mounting portion along an axis parallel to the third axis to a free end, said means for positioning the switches including a first metal piece interconnecting the mounting portions of the first pair of contact assemblies and a second metal piece interconnecting the mounting portions of the second pair of contact assemblies, each of said metal pieces having a threaded opening and a means for connecting a bared end of a wire centered on the third axis and an insulating part formed of arc suppressing material, said part having a body portion centered along the third axis and extending in the space between the switches and a pair of ears extending from the body portion, each of said ears having an opening aligned with one of the openings in the metal pieces for mounting said insulating part on the metal pieces, said insulating part providing a means for directing hot gases generated upon the opening of the contacts of said switches. 10. The combination as recited in claim 9 wherein each of said switches includes a second pair of stationary contact assemblies mounted on a corner portion of the front surface remote from the confronting side and spaced from the first side of the plane, each of said second pair of stationary contact assemblies including a pair Of metal stationary contact supports that are electrically connected together and spaced to be alternately engaged by a portion of the movable contact when the electromagnet is alternately energized and deenergized. |
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