Abstract: A revolver has a detent mechanism providing positive mechanical engagement between the cylinder yoke and the frame. A housing mounted on the frame has a spring biased plunger that transversely engages a pin. The pin projects from the housing and engages a recess on the yoke when the revolver cylinder is closed. The pin is biased into engagement with the recess by the plunger to maintain the revolver closed and the chambers of the cylinder in precise alignment with the barrel during firing. Manual force applied to the cylinder can overcome the biasing force and permit the revolver to be opened and closed.

Abstract: A revolver has a spring biased rod that extends from the cylinder, the rod having a tip that engages a portion of the frame to retain the cylinder within the aperture of the frame during firing. The rod is movable out of engagement with the frame portion to release the cylinder and allow it to pivot on a yoke for ejection of spent shells and reloading. A pin is mounted in the yoke so as to engage a recess in the frame when the cylinder is within the aperture of the frame. The pin retains the cylinder within the aperture and is spring loaded and movable out of engagement with the recess to permit the cylinder to pivot on the yoke for ejection of spent shells and reloading.

Abstract: A firearm comprising a frame, a barrel with a firing axis connected to the frame, a cylinder pivotally attached to the frame and positioned within an opening in the frame and having a plurality of firing chambers sized to receive a cartridge, and a firing mechanism including a trigger attached to the frame to actuate the firing mechanism, wherein the frame is substantially nonmetallic and includes at least one metal insert having a polymer over-molding. A cylinder retaining mechanism selectively retains the cylinder in a first position within a window in the frame and comprises a biasing pin operatively attached to a yoke and which is oriented in a direction substantially transverse to the bore axis when the cylinder is in the first position.

Abstract: A system and method for modeling a gas turbine assembly include a plurality of sensors configured to measure a plurality of operating parameters of a turbine assembly. The system further includes a model configured to compare the plurality of operating parameters with a plurality of predicted parameters to determine difference values. A Kalman filter of system is configured to evaluate the difference values to facilitate adjusting the model. The Kalman filter is further configured to accommodate for a missing operating parameter of the plurality of operating parameters to facilitate tuning the model.

Abstract: A polymeric revolver including a frame, a cylinder mounted in a rectangular aperture in the frame, a cylinder retaining mechanism and a cylinder releasing mechanism is provided. The cylinder retaining mechanism includes two assemblies: (1) an extractor, locking bolt and locking bolt retainer that house an extractor rod spring, and (2) a ratchet hub driver, hub drive center pin and central pin plate that house a ratchet drive spring. The two assemblies are biased toward one another forming a locking engagement of the extractor and the ratchet hub driver. The locking engagement is enhanced by a star-shaped configuration of grooves and ridges on the extractor and ratchet hub driver, respectively. The cylinder releasing mechanism includes a cylinder release lever that actuates the hub drive center pin and ratchet hub driver out of locking engagement with the extractor, and an ambidextrous thumb piece that facilitates access to the cylinder release lever.

Abstract: A polymeric revolver including a frame, a cylinder mounted in a rectangular aperture in the frame, a cylinder retaining mechanism and a cylinder releasing mechanism is provided. The cylinder retaining mechanism includes two assemblies: (1) an extractor, locking bolt and locking bolt retainer that house an extractor rod spring, and (2) a ratchet hub driver, hub drive center pin and central pin plate that house a ratchet drive spring. The two assemblies are biased toward one another forming a locking engagement of the extractor and the ratchet hub driver. The locking engagement is enhanced by a star-shaped configuration of grooves and ridges on the extractor and ratchet hub driver, respectively. The cylinder releasing mechanism includes a cylinder release lever that actuates the hub drive center pin and ratchet hub driver out of locking engagement with the extractor, and an ambidextrous thumb piece that facilitates access to the cylinder release lever.

Abstract: A polymeric revolver including a frame, a cylinder mounted in a rectangular aperture in the frame, a cylinder retaining mechanism and a cylinder releasing mechanism is provided. The cylinder retaining mechanism includes two assemblies: (1) an extractor, locking bolt and locking bolt retainer that house an extractor rod spring, and (2) a ratchet hub driver, hub drive center pin and central pin plate that house a ratchet drive spring. The two assemblies are biased toward one another forming a locking engagement of the extractor and the ratchet hub driver. The locking engagement is enhanced by a star-shaped configuration of grooves and ridges on the extractor and ratchet hub driver, respectively. The cylinder releasing mechanism includes a cylinder release lever that actuates the hub drive center pin and ratchet hub driver out of locking engagement with the extractor, and an ambidextrous thumb piece that facilitates access to the cylinder release lever.

Abstract: A polymeric revolver including a frame, a cylinder mounted in a rectangular aperture in the frame via a yoke, and a cylinder retaining mechanism is provided. The cylinder retaining mechanism includes multiple assemblies, which lock the yoke in the cylinder-closed position, including: (1) an extractor, a locking bolt and a locking bolt retainer that house an extractor rod spring and engage a ratchet hub driver, hub drive center pin and central pin plate that house a ratchet drive spring; (2) a star-shaped configuration of grooves and ridges on the extractor and the ratchet hub driver, respectively; (3) a rear taper of the locking bolt that engages a concave recess at the axial center of the rounded groove of the locking bolt recess; and (4) an annular ring that engages an inner wall of an annular opening in a breach face of the frame.

Abstract: A polymeric revolver including a frame, a cylinder mounted in a rectangular aperture in the frame, a cylinder retaining mechanism and a cylinder releasing mechanism is provided. The cylinder retaining mechanism includes two assemblies: (1) an extractor, locking bolt and locking bolt retainer that house an extractor rod spring, and (2) a ratchet hub driver, hub drive center pin and central pin plate that house a ratchet drive spring. The two assemblies are biased toward one another forming a locking engagement of the extractor and the ratchet hub driver. The locking engagement is enhanced by a star-shaped configuration of grooves and ridges on the extractor and ratchet hub driver, respectively. The cylinder releasing mechanism includes a cylinder release lever that actuates the hub drive center pin and ratchet hub driver out of locking engagement with the extractor, and an ambidextrous thumb piece that facilitates access to the cylinder release lever.

Abstract: A revolver with latching mechanism for swing-out type cylinder. The revolver includes a frame, a rotatable cylinder movable from a ready-to-fire position in the frame to a loading position laterally displaced outwards from the frame, and a latching member retained in the frame by a barrel insert that defines a bullet bore. In one embodiment, the latching member may be a spring-loaded plunger movable from a locked position in which the cylinder is locked in the ready-to-fire position to an unlocked position in which the cylinder is movable to the loading position. A cylinder crane pivotally mounts the cylinder in the frame and moving the plunger to the unlocked position allows the cylinder crane to be swung out laterally from the frame by a user. In one embodiment, the plunger is held in the frame by a retaining plug engaged by the barrel insert.

Abstract: A polymeric revolver including a frame, a cylinder mounted in a rectangular aperture in the frame, a cylinder retaining mechanism and a cylinder releasing mechanism is provided. The cylinder retaining mechanism includes two assemblies: (1) an extractor, locking bolt and locking bolt retainer that house an extractor rod spring, and (2) a ratchet hub driver, hub drive center pin and central pin plate that house a ratchet drive spring. The two assemblies are biased toward one another forming a locking engagement of the extractor and the ratchet hub driver. The locking engagement is enhanced by a star-shaped configuration of grooves and ridges on the extractor and ratchet hub driver, respectively. The cylinder releasing mechanism includes a cylinder release lever that actuates the hub drive center pin and ratchet hub driver out of locking engagement with the extractor, and an ambidextrous thumb piece that facilitates access to the cylinder release lever.

Abstract: A revolver with latching mechanism for swing-out type cylinder. The revolver includes a frame, a rotatable cylinder movable from a ready-to-fire position in the frame to a loading position laterally displaced outwards from the frame, and a latching member retained in the frame by a barrel insert that defines a bullet bore. In one embodiment, the latching member may be a spring-loaded plunger movable from a locked position in which the cylinder is locked in the ready-to-fire position to an unlocked position in which the cylinder is movable to the loading position. A cylinder crane pivotally mounts the cylinder in the frame and moving the plunger to the unlocked position allows the cylinder crane to be swung out laterally from the frame by a user. In one embodiment, the plunger is held in the frame by a retaining plug engaged by the barrel insert.

Abstract: A polymeric revolver including a frame, a cylinder mounted in a rectangular aperture in the frame via a yoke, and a cylinder retaining mechanism is provided. The cylinder retaining mechanism includes multiple assemblies, which lock the yoke in the cylinder-closed position, including: (1) an extractor, a locking bolt and a locking bolt retainer that house an extractor rod spring and engage a ratchet hub driver, hub drive center pin and central pin plate that house a ratchet drive spring; (2) a star-shaped configuration of grooves and ridges on the extractor and the ratchet hub driver, respectively; (3) a rear taper of the locking bolt that engages a concave recess at the axial center of the rounded groove of the locking bolt recess; and (4) an annular ring that engages an inner wall of an annular opening in a breach face of the frame.

Abstract: A polymeric revolver including a frame, a cylinder mounted in a rectangular aperture in the frame, a cylinder retaining mechanism and a cylinder releasing mechanism is provided. The cylinder retaining mechanism includes two assemblies: (1) an extractor, locking bolt and locking bolt retainer that house an extractor rod spring, and (2) a ratchet hub driver, hub drive center pin and central pin plate that house a ratchet drive spring. The two assemblies are biased toward one another forming a locking engagement of the extractor and the ratchet hub driver. The locking engagement is enhanced by a star-shaped configuration of grooves and ridges on the extractor and ratchet hub driver, respectively. The cylinder releasing mechanism includes a cylinder release lever that actuates the hub drive center pin and ratchet hub driver out of locking engagement with the extractor, and an ambidextrous thumb piece that facilitates access to the cylinder release lever.

Abstract: A rotary clip rotation mechanism for an air gun, having a nail for engaging with a nail engagement section provided in the rotary clip and causing rotation of a rotary clip, comprises an L-shaped arm, capable of rotating about an arm shaft, with a muzzle side end opening section formed from a curved surface section; an arm elastic section provided at a position contacting the tip of the curved surface section of the L-shaped arm, a nail support arm provided so as to rotate on a gun rear end side of the L-shaped arm by means of a connecting elastic section, and a nail urged in the direction of the tip end by a nail elastic section provided on a tip of the nail support arm.

Abstract: A revolver that has firing means arranged so as to substantially raise the resting point of the middle finger of the hand on the handle.

Abstract: A cylinder retaining mechanism for a firearm includes a frame having a firing bore and a cylinder having a longitudinal bore. A yoke is pivotally connected to the frame and is operatively connected to the cylinder for selectively pivoting the cylinder between a first position in which the longitudinal bore is aligned with the firing bore, and a second position in which the longitudinal bore is not aligned with the firing bore. A biasing mechanism is housed in the frame and has an engaging portion which is selectively accommodated within an engaging cavity formed in the yoke when the cylinder is in the first position.

Abstract: Revolver firearm comprising a body divided in an upper part, or slider, comprising a barrel and a drum, slidingly associated with a lower part, or case, comprising a handle, a trigger and a hammer; a first kinematic chain arranged in said case for arming the hammer; a second kinematic chain, arranged in said slider, and adapted to cause the rotation of the drum and to successively align the firing chambers of the drum with the barrel, the first and second kinematic chains being selectively activated by manually operating the hammer directly or the trigger or using the forces generated by the recoil; a third kinematic chain for connecting the first and second chains; the third kinematic chain has a desmodromic member having an active transfer action synchronously transferring motion from the first chain to the second chain during the firing action and a resistance passive action during the automatic re-cocking of the firearm caused by the recoil forces.

Abstract: A revolver is provided with two cylinders, each of which is alignable in a firing position, a storage position, or a loading position. The cylinders are carried by a crane that pivots to orient the cylinders in a selected one of the above three positions. When one cylinder is in the firing position, the other cylinder will be in the storage position. A cartridge retaining ring secures cartridges within a cylinder as the cylinder travels from the storage position to the firing position. An ejector mechanism is provided on each cylinder to expel spent cartridges from cylinder chambers. Advantageously, the two cylinders can be loaded with two different types of ammunition.

Abstract: A retainer for a revolver yoke stud includes a screw portion with spring and pin detent carried thereby in a unitary assembly. The yoke stud includes an angular groove with a chamfered surface adapted to be engaged by the tapered end of the pin. The frame of the revolver is provided with a threaded bore and a hole in its plate aligned with the chamfer of the stud when the yoke is disposed in operative position in the revolver. The screw serves the dual function of a fastener for the side plate and as the base or mounting member for the spring detent assembly. The screw and pin include oppositely opening tubular recesses and the pin is adapted for axial movment with respect to the screw member. The outer ends of the spring are enlarged to be captured and retained in the opposed tubular recessed of the screw and pin, thereby forming a unitary assembly.

Abstract: The invention relates to a retaining device for retaining the crane of a revolver, said device being intended to provide longitudinal locking between the crane and the revolver crane while still allowing said crane to be released for dismantling purposes. According to the invention, a stopper (42) is slidably mounted inside the crane (3), said stopper having an end (44) projecting downwardly from the crane (3) in order to engage in an associated groove (47) provided in the frame (2) of the revolver. The stopper (42) is laterally accessible in part via an oblong slot (18) in the crane (3), thereby enabling said crane to be released by means of an elongate tool which retracts the end (44) of the sliding stopper (42). The invention is applicable to revolvers.

Abstract: A locking device is provided for holding the crane (3) in its closed position by means of a pushbutton (14) and a sliding latch (15) mounted in the crane (3). The pushbutton (14) is laterally accessible from the side of the gun opposite to the side from which the cylinder (4) is swung out, and the pushbutton co-operates directly with the sliding latch (15) in order to retract its end that is normally received in an associated notch provided in the frame (2) of the revolver. The pushbutton device (14) thus makes it possible to unlock the crane (3) using the same hand as is used to push the cylinder (4) towards its open position, and this is highly advantageous on ergonomic grounds. The invention is applicable to revolver manufacture.

Abstract: Modifications are provided in the structure of firearms such as breech-loading revolver handguns. Traditionally, these firearms are constructed with mating surfaces in face to face contact, which surfaces must be separated for loading. Where foreign particles are trapped between the flat mating surfaces on closing, jamming results. In one aspect of the invention, these flat mating surfaces are provided with cavities, so that any such foreign matter will fall into the cavities and not prevent the closing of the firearm mechanism after loading. In another aspect of the invention, a series of small vee-type notches, discernible by touch, are formed around the rear edge of a rotary magazine of cartridge cylinder, in a descending sequence in direction opposite to the operative direction of rotation of the rotary magazine when in battery.

Abstract: A revolver has a lowered firing line by alignment of the barrel with the lowermost chamber of the cylinder. The latter is swingably mounted on a frame at a location above the cylinder and cooperates with a firing mechanism in a compartment of the stock above the grip.

Abstract: A split die (12) has a removable split die insert (40) to make it adaptable for receiving different types of ferrules. A ferrule (72) and tube (70) to be attached thereto are received into a cavity (42) in insert (40). Tube (70) indexes on a radial shoulder (76) in ferrule (72). A drawbolt (20) with an elastomeric expander (38) thereon is positioned inside tube (70) with its shaft (22) extending outwardly and through an anvil insert (52, 62). The outer end of the expander (38) is prevented from extruding along drawbolt (20) by a split ring (36). The inner end of expander (38) is contained by portions of the anvil insert (52, 62). In one embodiment, shaft (22) extends through a machined bearing surface (56) in insert (52). A boss (54) on insert (52) extends into ferrule (72) and abuts the inner end of expander (38) to contain expander (38).

Abstract: A retaining means for revolver cylinders includes a resilient bushing which, upon being inserted in the cylinder bore, is engaged in an annular recess in a hollow cylinder axle making it impossible to disengage the two parts from one another after introducing an extractor mechanism in the bushing and threadedly connecting a sleeve of the mechanism with the threaded end of the extractor rod.

Abstract: A semi-automatic double action revolver having an axially slidable and rotatable barrel aligned with a lower chamber of a top pivotal swing-out cylinder. The trigger mechanism includes a safety rod to prevent the opening of the cylinder while the hammer is cocked, or not in the rest position, and a transfer bar is provided between the hammer and the firing pin so that the firing pin can only be actuated when the trigger has been pulled all the way back, beyond the double action and single action hammer cock position.

Abstract: A combined cylinder-release and safety device for a double-action revolver having a finger lever which is held in its normal, safety-off, position by the cylinder-spindle spring for manipulation in one direction against the pressure of the spring in order to release the cylinder. Provision is made for also moving the finger lever in the other direction beyond its normal position in order to lock the action, so that the gun cannot be fired either in double-action or in single-action.