Patents by Inventor Robert D. Switzer

Robert D. Switzer 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: 5842299
    Abstract: A cartridge loader for a revolver, the loader having a casing with a series of cartridge bores located on a bore circle locus of points having a larger diameter then the chamber circle locus of points for the revolver. The casing's bores preferably each have two flatted side wall portions that aid in defining the tubular wall of the bore, one of the flatted wall portions of each cartridge bore being adjacent one of the flatted side wall portions of an adjacent cartridge bore.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: December 1, 1998
    Inventors: Robert D. Switzer, deceased, by Deborah L. Switzer, executrix
  • Patent number: 5402594
    Abstract: A cartridge loader for a cartridge clip as disclosed. The loader includes a loader sleeve slidingly receivable on the magazine to compress the clip's spring in order to permit easy re-loading of the clip. A brake connected to the sleeve co-acts with the magazine's sidewall surface so as to impede the sleeve from disengagement with the magazine in the event the sleeve is inadvertently released by a user when the clip's spring is compressed and with no cartridges present in the clip. In preferred form, the brake is comprised of a brake arm that causes the sleeve to slide in a frictional braking relation with the clip's sidewall surface and that itself slides in a frictional braking relation with the clip's sidewall surface.
    Type: Grant
    Filed: April 1, 1994
    Date of Patent: April 4, 1995
    Inventor: Robert D. Switzer
  • Patent number: 5377436
    Abstract: A reloader for a cartridge clip that allows the reloader and clip, when assembled for reloading purposes, to be held and operated in one of a user's hands while cartridges are reloaded in the clip with the other of the user's hands. The reloader includes a sleeve adapted to receive the clip in seated relation during reloading, and a handle connected to the sleeve against which the clip lies when the clip is in operational relation with the reloader, thereby allowing the clip and reloader to be held in operational assembly with one of the user's hands. The reloader also includes a plunger that is manually reciprocable to depress a top cartridge already seated in the cartridge clip to accommodate receiving another cartridge as a successor top cartridge in the cartridge clip.
    Type: Grant
    Filed: July 6, 1993
    Date of Patent: January 3, 1995
    Inventor: Robert D. Switzer
  • Patent number: 5249386
    Abstract: A reloader for a cartridge clip that allows the reloader and clip, when assembled for reloading purposes, to be held and operated in one of a user's hands while cartridges are reloaded in the clip with the other of the user's hands. The reloader includes a sleeve adapted to receive the clip in seated relation during reloading, and a handle connected to the sleeve against which the clip lies when the clip is in operational relation with the reloader, thereby allowing the clip and reloader to be held in operational assembly with one of the user's hands. The reloader also includes a plunger that is manually reciprocable to depress a top cartridge already seated in the cartridge clip to accommodate receiving another cartridge as a successor top cartridge in the cartridge clip.
    Type: Grant
    Filed: August 26, 1992
    Date of Patent: October 5, 1993
    Inventor: Robert D. Switzer
  • Patent number: 5081778
    Abstract: A cartridge clip having a mechanism which permits the compression force of the clip's spring to be relieved when reloading the clip. The mechanism, in preferred form, includes a door frame connected to the magazine's closed end, an access door mounted to that door frame which is movable between open and closed positions, and a spring seat within which the compression spring is received. The spring seat is telescoped interiorly of the magazine when the access door is closed to provide the requisite compression spring force for ejection of cartridges from the magazine's ejection end. The spring seat is telescoped exteriorly of the magazine to a predetermined outside position when the door is opened so as to relieve that spring force for permitting additional cartridges to be loaded into the magazine's ejection end.
    Type: Grant
    Filed: June 11, 1990
    Date of Patent: January 21, 1992
    Inventor: Robert D. Switzer
  • Patent number: 5031566
    Abstract: A support post system for a flexible cover that is attached around its periphery to ground, e.g., a cover for a boat. The system includes, in preferred form, a collar with throughbore that is attached to the cover. A support post is inserted in telescoped relation through the collar's bore from above the cover, one end of the support post being supported on ground and the other end of the support post extending above the cover. In one preferred embodiment a flexible tension member, e.g., a rope, is fixed at one end to the collar, and is trained over a guide head fixed to the post above the cover. In use, the rope is manually pulled downwardly by a person from above the cover so as to lift the collar up the post. This simultaneously lifts the cover to a desired location above ground at which it is taut so that rainwater does not puddle on it. After the collar and cover are lifted to the preferred elevated location, the rope is tied off on the collar so as to maintain tautness of the cover.
    Type: Grant
    Filed: March 5, 1990
    Date of Patent: July 16, 1991
    Inventor: Robert D. Switzer
  • Patent number: 4995179
    Abstract: A cartridge clip having a mechanism which permits the compression force of the clip's spring to be relieved when reloading the clip. The mechanism, in preferred form, includes a door frame connected to the magazine's closed end, an access door mounted to that door frame which is movable between open and closed positions, and a spring seat within which the compression spring is received. The spring seat is telescoped interiorly of the magazine when the access door is closed to provide the requisite compression spring force for ejection of cartridges from the magazine's ejection end. The spring seat is telescoped exteriorly of the magazine to a predetermined outside position when the door is opened so as to relieve that spring force for permitting additional cartridges to be loaded into the magazine's ejection end.
    Type: Grant
    Filed: November 9, 1989
    Date of Patent: February 26, 1991
    Inventor: Robert D. Switzer
  • Patent number: 4492051
    Abstract: A modular cartridge loading board system comprised of a series of individual cartridge storage blocks, the blocks being mountable on a backing board in any matrix configuration desired by the user. Each cartridge storage block is comprised of a base plate and a series of axially parallel cartridge tubes extending outwardly from one surface of the plate, the tubes being oriented on a locus of points and being equal in number to the locus and number of chambers in the cylinder of a user's hand gun. Each tube is provided with a dual seat configuration interiorly thereof so as to seat either a round nose cartridge or a flat nose cartridge in substantially non-jiggling fashion when the cartridge is positioned nose down within the tube. When a storage block is filled with either round nose or flat nose cartridges, the cartridges are easily transferred to a cartridge loader and, subsequently, from the cartridge loader to the cylinder's chambers of the user's hand gun.
    Type: Grant
    Filed: September 19, 1983
    Date of Patent: January 8, 1985
    Inventor: Robert D. Switzer
  • Patent number: 4313275
    Abstract: An improved cartridge loader of the type having a generally star shaped latch that cooperates with cartridge bores positioned within a casing. A first novel feature is a semi-automatic rotation device for the star shaped latch, which device causes rotation of the latch from a cartridge capturing position to a cartridge releasing position in response to an external force directed axially against a knob when the casing is restrained against rotational motion, and which device will not induce rotation of the latch unless the casing is so restrained. The semi-automatic rotation device is also manually operable to set the latch from the releasing position to the capturing position, and to return the latch from the capturing position to the releasing position, simply by manually rotating the knob.
    Type: Grant
    Filed: January 3, 1980
    Date of Patent: February 2, 1982
    Inventor: Robert D. Switzer
  • Patent number: 4202124
    Abstract: An improved cartridge loader of the type having a generally star shaped latch that cooperates with cartridge bores positioned within a casing. A first novel feature is a semi-automatic rotation device for the star shaped latch, which device causes rotation of the latch from a cartridge capturing position to a cartridge releasing position in response to an external force directed axially against a knob when the casing is restrained against rotational motion, and which device will not induce rotation of the latch unless the casing is so restrained. The semi-automatic rotation device is also manually operable to set the latch from the releasing position to the capturing position, and to return the latch from the capturing position to the releasing position, simply by manually rotating the knob.
    Type: Grant
    Filed: May 15, 1978
    Date of Patent: May 13, 1980
    Inventor: Robert D. Switzer