Patents by Inventor Alfred L. Ehrenfels

Alfred L. Ehrenfels has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5758414
    Abstract: A universal AC/DC electrical connector for selectively coupling either a mating direct electrical current (DC) electrical connector or a mating alternating electrical current (AC) electrical connector to selectively receive both direct electrical current (DC) and alternating electrical current (AC) therein. The AC/DC electrical connector has a pair of direct current contacts, a pair of alternating current contacts, and a ground contact. When DC electrical connector is coupled to the AC/DC electrical connector, the direct current contacts and the ground contact electrically engage corresponding electrical contacts of the DC electrical connector, while the alternating current contacts of the AC/DC electrical connector remains uncoupled, i.e., alternating current connects of the AC/DC electrical connector does not electrically engage the contacts of the DC electrical connector.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: June 2, 1998
    Assignee: Hubbell Incorporated
    Inventor: Alfred L. Ehrenfels
  • Patent number: 5584715
    Abstract: A universal AC/DC electrical connector for selectively coupling either a mating direct electrical current (DC) electrical connector or a mating alternating electrical current (AC) electrical connector to selectively receive both direct electrical current (DC) and alternating electrical current (AC) therein. The AC/DC electrical connector has a pair of direct current contacts, a pair of alternating current contacts, and a ground contact. When DC electrical connector is coupled to the AC/DC electrical connector, the direct current contacts and the ground contact electrically engage corresponding electrical contacts of the DC electrical connector, while the alternating current contacts of the AC/DC electrical connector remains uncoupled, i.e., alternating current connects of the AC/DC electrical connector does not electrically engage the contacts of the DC electrical connector.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: December 17, 1996
    Assignee: Hubbell Incorporated
    Inventor: Alfred L. Ehrenfels
  • Patent number: 5434360
    Abstract: A closure plug having a pair of insulating members coupled together by a fastener for plugging an opening in an electrical box or an enclosure. The closure plug also includes a gasket for providing a weather tight seal around the opening in the electrical box. The fastener is frictionally retained in one of the insulating members for rotation therewith. The insulating member with the fastener coupled thereto preferably has a plurality of ribs for rotation the fastener into a hole formed in the other insulating member.
    Type: Grant
    Filed: June 29, 1993
    Date of Patent: July 18, 1995
    Assignee: Hubbell Incorporated
    Inventor: Alfred L. Ehrenfels
  • Patent number: 5346406
    Abstract: An electrical cable and connector assembly for electrically coupling equipment to a power source, and having an electrical cable with a plurality of power conductors and a pilot conductor releasably coupled to an electrical contact in an electrical connector, so that the pilot conductor releases from the electrical contact of the connector when a mechanical stress or force is applied to the cable. The pilot conductor releases from the contact of the connector prior to damage occurring to the remaining conductors from the stress or force applied to the cable. The power conductors are spirally wrapped about the centrally located pilot conductor so that the power conductors can stretch while the pilot conductor is pulled from its electrical contact upon application of the force or stress on the cable.
    Type: Grant
    Filed: April 30, 1993
    Date of Patent: September 13, 1994
    Assignee: Hubbell Incorporated
    Inventors: Ernest G. Hoffman, Alfred L. Ehrenfels
  • Patent number: 5273445
    Abstract: A male electrical connector having an insulating plug body and a cylindrical sleeve surrounding conductive prongs extending from the plug body. The sleeve has at least one aperture in a side wall thereof to removably receive a locking member. The removable locking member is preferably a padlock having a substantially U-shaped shackle extending through the aperture in the sleeve to prevent insertion of the male connector into the mating female connector.
    Type: Grant
    Filed: April 22, 1993
    Date of Patent: December 28, 1993
    Assignee: Hubbell Incorporated
    Inventors: Alfred L. Ehrenfels, Robert J. Simon
  • Patent number: 5239129
    Abstract: An electrical housing apparatus has an electrically non-conductive enclosure with side and end walls. One of the end walls has an opening to receive an electrical conduit and the other walls are un-perforated. An electrically conductive frame is mounted inside the enclosure, the frame being arranged to support electrical devices is a specific vertical orientation and provide ground bonding between the conduits and electrical devices in the housing. Mounting brackets at opposite ends of the frame have openings either of which can be aligned with the end wall opening when the frame is placed in the enclosure, depending on the orientation of the enclosure: the end wall with the opening can be at the top to accommodate a top conduit connection or at the bottom to accommodate a bottom conduit connection. A water-resistant cover closes the front of the box, the cover and frame being arranged to have a single orientation regardless of which enclosure orientation is used.
    Type: Grant
    Filed: April 6, 1992
    Date of Patent: August 24, 1993
    Assignee: Hubbell Incorporated
    Inventor: Alfred L. Ehrenfels
  • Patent number: 5035646
    Abstract: A pin and sleeve receptacle is mountable in a wall box recessed in a wall opening of a building with wires extending into the box from an in-wall wiring passage. The receptacle has a tubular electrically non-conductive shell closed at one end, the other end being open and a flange with fastener openings at the open end of the shell. A cylindrical inner body has an outer diameter smaller than the first inner diameter, the inner body having female connector sleeves for receiving electrically conductive pins of a mating plug. The inner body is mounted within the shell with an annular gap surrounding the inner body for receiving the shroud of the pin-and-sleeve plug. The opening at one end face the same direction as the open end of the shell to receive the pins of the plug. Apertures in the shell admit wires from the box for connection to the electrically conductive female connectors.
    Type: Grant
    Filed: June 29, 1990
    Date of Patent: July 30, 1991
    Assignee: Hubbell Incorporated
    Inventors: Alfred L. Ehrenfels, David Lutz, Martin Parker
  • Patent number: 4790765
    Abstract: A ground shunt structure for an electrical connector which receives a shielded cable includes a electrically conductive spring encircling an exposed end portion of the cable shielding to make physical and electrical contact therewith. An elongated strip of electrically conductive material extends between the shield and a ground contact of the connector, the end adjacent the shield being held by the spring. The spring can be hooked to the strip or can encircle the strip to embrace it.
    Type: Grant
    Filed: October 5, 1987
    Date of Patent: December 13, 1988
    Assignee: Hubbell Incorporated
    Inventors: Alfred L. Ehrenfels, Michael J. D'Amato
  • Patent number: 4740176
    Abstract: An electrical connector has male and female housing halves each of which has front and rear housing portions. The rear housing portion has an externally threaded front end, a stop shoulder at the rear extent of the threads and a hole to receive a latch pin. The front housing portion has internal threads at the rear end to engage the threads on the rear housing portion and also has an end face with a recess. The latch pin penetrates the rear housing near the stop shoulder and has a nonsymmetrical head. The latch pin can be rotated between a position in which the head protrudes beyond the stop shoulder and a position in which it does not protrude beyond the stop shoulder. When fully threaded together, the recess is aligned with the latch pin which can be rotated to its latching, protruding position to prevent unthreading of the housing portions.
    Type: Grant
    Filed: March 25, 1987
    Date of Patent: April 26, 1988
    Assignee: Hubbell Incorporated
    Inventors: Michael R. Marks, Alfred L. Ehrenfels
  • Patent number: 4736999
    Abstract: A connector for high current use includes a plug half and a receptacle half. The plug half includes a sleeve which receives a blade holder and a contact holder. The sleeve is provided with notches having predetermined angular positions and widths. The blade and contact holders also include notches which are mated with those of the sleeve. A plurality of sleeves having a variety of notch widths and positions can be provided to define a selection of connectors for various electrical circumstances. Blade and contact holders with a variety of sets of key positions and widths are provided to match the sleeves and to have the necessary electrical characteristics.
    Type: Grant
    Filed: March 25, 1987
    Date of Patent: April 12, 1988
    Assignee: Hubbell Incorporated
    Inventors: Michael R. Marks, Alfred L. Ehrenfels
  • Patent number: 4686381
    Abstract: An overhead wiring system for use in the suspended ceiling of a clean room includes a generally rectangular housing with closed top, side and end walls and a substantially open bottom. A plurality of movable panels are provided in the bottom to close the bottom wall, one or more of the panels having openings through which a power cord can pass. A barrier within the housing divides its interior into a wiring chamber and a power cord chamber, the wiring chamber having a terminal strip connectable with wires from an external conduit. A power cord is connected to the terminal strip, through the barrier and through one of the panels with a stress-relieving cord grip in each of the pass-through locations. The housing is supporting so as to be substantially coplanar with a suspended ceiling and without exerting stress on the ceiling.
    Type: Grant
    Filed: June 30, 1986
    Date of Patent: August 11, 1987
    Assignee: Hubbell Incorporated
    Inventors: William C. Boteler, Alfred L. Ehrenfels
  • Patent number: 4674807
    Abstract: An electrical connector has an electrically non-conductive outer housing and connector members recessed in one end of the housing. Electromagnetic interference shielding is provided by members surrounding the components within the housing including an electrically conductive grommet circularly contacting conductive braid on the cable to which the connector is attached and a sleeve which surrounds the wires within the housing and extends axially to the connector end. One of the connector prongs is designated as the ground prong and is electrically attached to the sleeve. Embodiments accommodating three and four wires are disclosed.
    Type: Grant
    Filed: March 3, 1986
    Date of Patent: June 23, 1987
    Assignee: Harvey Hubbell Incorporated
    Inventors: William C. Boteler, Alfred L. Ehrenfels, David L. Lutz
  • Patent number: 4381879
    Abstract: A weatherproof housing and rotatable cover have radial lugs which are engaged when the cover is closed in a specific position and rotated clockwise. The cover is hingedly attached to the housing by a J-shaped arm and the cover has a skirt, one surface of which faces walls formed on the arm. The skirt has cam and stop surfaces defining a recess which engages a wall on the arm in the specific position, acting as a detent to inhibit rotational movement of the cover when it is open. Limited tilting movement of the cover is permitted by a sinuous spring in the mounting of the cover on the arm. A stop pin on the skirt prevents the cover from being rotated by 180.degree..
    Type: Grant
    Filed: February 25, 1981
    Date of Patent: May 3, 1983
    Assignee: Harvey Hubbell Incorporated
    Inventors: Alfred L. Ehrenfels, Michael R. Marks
  • Patent number: 4361252
    Abstract: A wiring device with a pivotable and rotatable cover wherein the cover has a seal which is movable relative to the cover. The seal includes a resilient ring or disk carried by a stiff supporting disk loosely retained in the cover. When the cover is closed and rotated to tighten the cover on the device, the seal frictionally engages the mouth of the device and the cover rotates relative to the seal, avoiding damage to the seal.
    Type: Grant
    Filed: July 23, 1981
    Date of Patent: November 30, 1982
    Assignee: Harvey Hubbell Incorporated
    Inventors: Richard I. Black, Alfred L. Ehrenfels, Michael R. Marks
  • Patent number: 4243835
    Abstract: A non-rigid mechanical coupling for coupling a head assembly of a feed-through fitting to a slotted wiring conduit inserted in an opening formed in the floor of a building, wherein an apertured conduit flange is provided with plural tabs extending radially inwardly into plural slots formed in a common transverse plane in the conduit such that the conduit flange tabs are loosely retained in the conduit slots to provide a non-rigid mechanical connection therebetween.
    Type: Grant
    Filed: June 15, 1979
    Date of Patent: January 6, 1981
    Assignee: Harvey Hubbell, Incorporated
    Inventor: Alfred L. Ehrenfels
  • Patent number: D349276
    Type: Grant
    Filed: February 1, 1993
    Date of Patent: August 2, 1994
    Assignee: Hubbell Incorporated
    Inventors: Ernest G. Hoffman, Alfred L. Ehrenfels