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Bolt action muzzle loading firearm




Title: Bolt action muzzle loading firearm.
Abstract: A muzzle loading firearm includes a barrel, a receiver, and a breech plug located at the breech end of the barrel. An insert integral with or attached to the breech plug provides sealing engagement against an opening in a cartridge case. The breech plug and insert together define a bore to allow a flame from an ignited primer on a cartridge casing to travel to a projectile propellant at the breech end of the barrel. A bolt without conventional lugs is movable within the receiver between an open position and a closed position. A pin extends through the receiver engaging a camming groove in the bolt to guide and lock the bolt against a primer end of an ignition casing. The camming groove and metal pin are configured to compress a face of the ignition cartridge against the breech plug when the bolt is in the closed position. ...


USPTO Applicaton #: #20140082981
Inventors: Kenneth E. Johnston


The Patent Description & Claims data below is from USPTO Patent Application 20140082981, Bolt action muzzle loading firearm.

CROSS-REFERENCE TO RELATED APPLICATIONS

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Not Applicable.

FIELD OF THE INVENTION

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This disclosure relates to bolt action muzzle loading firearms.

BACKGROUND

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OF THE INVENTION

Muzzle loading firearms, in which the projectile and the propellant charge are loaded from the muzzle end of the barrel, have become increasingly popular due in part to the establishment of special muzzle loader only seasons in many states.

In-line bolt action muzzle loading firearms are particularly popular with hunters and firearms enthusiasts that prefer a modern configuration. A significant example of such firearms is disclosed in my prior U.S. Pat. Nos. 5,706,598 and 6,385,887, which are hereby incorporated by reference in their entireties herein. These patents describe an adaptor or breech plug for mounting a cartridge casing that is used to convert a standard cartridge firing firearm into a muzzle loading firearm. A cartridge case with a primer, but without a bullet or propellant, is placed into the breech and the bolt closed to lock the cartridge into place. In each of my patents, it is described that the bolt is provided with camming lugs on the bolt adjacent the breech end to lock the bolt in the receiver. In order to accommodate the camming lugs at the breech end of the bolt, the receiver must have channels or raceways configured for receiving the camming lugs. Considerable machining is required to provide the raceways or channels for camming locks. A problem is that it is possible to convert the firearm to be a modern breech loading firearm by replacing the barrel. The present invention prevents this possibility.

Various other inserts and adapters with a nipple have been used to convert a cartridge gun into a black powder muzzle loading firearm using a percussion primer cup. The cap is small and difficult to place on the nipple, and various muzzle loading firearms that do not use a primed cartridge casing for igniting the projectile propellant are described in the literature.

SUMMARY

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OF THE DISCLOSURE

Disclosed is a muzzle loading, bolt action firearm with a receiver and a barrel into which a propellant and bullet is introduced through the muzzle, which comprises: (a) a bolt assembly with a cylindrical bolt body defining a longitudinal axis, with a cross-sectional diameter along the axis from a distal end to a proximal end, with a face at the proximal end adapted for engaging a head of a primed cartridge casing, and a longitudinal slot along a surface of the body adapted to engage a guide pin on the receiver, and with a spring loaded firing pin adapted to selectively engage the primer on the cartridge casing when released by a sear activated by a trigger on the firearm; (b) a handle mounted on the bolt body adapted to longitudinally slide the body along a mating cylindrical opening in the receiver, wherein the slot with the guide pin is adapted to guide the bolt body in the receiver to move the bolt along the axis until the face engages the head of the cartridge casing, and rotate the body on the axis into a locked position in the receiver, and wherein when the bolt body is rotated by the arm in the receiver, the bolt face is configured to press an inside of the casing opposite the primer against a member with an opening into the barrel for igniting the propellant. In certain embodiments, the slot is rectangular in cross-section. In certain embodiments, the slot is angled adjacent the handle towards the face of the bolt and the pin on the receiver is positioned to mate with the slot. In certain embodiments, the bolt has an area of milled off lugs adjacent the face of the bolt. In certain embodiments, the bolt has a substantially constant cross-sectional shape at an area adjacent the face of the bolt. In certain embodiments, the pin is hardened steel.

Further, disclosed is a bolt and receiver assembly adapted for a muzzle loading, bolt action firearm with a barrel mounted on the receiver into which a propellant and bullet is introduced through the muzzle, which comprises: (a) a bolt assembly with a cylindrical bolt body defining a longitudinal axis, with a cross-sectional diameter along the axis from a distal end to a proximal end, with a face at the proximal end adapted for engaging a head of a primed cartridge casing, with a longitudinal slot along a surface of the body adapted to engage a guide pin on the receiver, and with a spring loaded firing pin adapted to selectively engage the primer on the cartridge casing when released by a sear activated by a trigger on the firearm; (b) a handle mounted on the bolt body adapted to longitudinally slide the body along a mating cylindrical opening in the receiver, wherein the slot with the guide pin is adapted to guide the bolt body in the receiver to move the bolt along the axis until the face engages the head of the cartridge casing and rotate the body on the axis into a locked position in the receiver, and wherein when the bolt body is rotated by the arm in the receiver, the bolt face is configured to press an inside of the casing opposite the primer against a member with an opening into the barrel for igniting the propellant. In certain embodiments, the slot is rectangular in cross-section. In certain embodiments, the slot is angled adjacent the handle towards the face of the bolt and the pin on the receiver is positioned to mate with the slot. In certain embodiments, the bolt has an area of milled off lugs adjacent the face of the bolt. In certain embodiments, the bolt has a substantially constant cross-sectional shape at an area adjacent the face of the bolt. In certain embodiments, the pin is hardened steel.

Further still, disclosed is a bolt assembly adapted for a muzzle loading, bolt action firearm with a receiver and a barrel into which a propellant and bullet is introduced through the muzzle, which comprises: (a) a cylindrical bolt body defining a longitudinal axis, with a cross-sectional diameter along the axis from a distal end to a proximal end, with a face at the proximal end adapted for engaging a head of a primed cartridge casing, with a longitudinal slot along a surface of the body adapted to engage a guide pin on the receiver, and with a spring loaded firing pin adapted to selectively engage the primer on the cartridge casing when released by a sear activated by a trigger on the firearm; (b) a handle mounted on the bolt body adapted to longitudinally slide the body along a mating cylindrical opening in the receiver, wherein the slot with the guide pin is adapted to guide the bolt body in the receiver to move the bolt along the axis until the face engages the head of the cartridge casing and to rotate the body on the axis into a locked position in the receiver, and wherein when the bolt body is rotated by the arm in the receiver the bolt face is configured to press an inside of the casing opposite the primer against a member with an opening into the barrel for igniting the propellant. In certain embodiments, the slot is rectangular in cross-section. In certain embodiments, the slot is angled adjacent the handle towards the face of the bolt and the pin on the receiver is positioned to mate with the slot. In certain embodiments, the bolt has an area of milled off lugs adjacent the face of the bolt. In certain embodiments, the bolt has a substantially constant cross-sectional shape at an area adjacent the face of the bolt.

Finally, disclosed is a muzzle loading bolt action firearm having a firing pin mechanism, comprising: a barrel having a breech end and a center bore along a longitudinal axis; a receiver mounted on the breech end of the barrel; a breech plug with an orifice along the axis located at the breech end of the barrel with an opening for a cartridge casing; an insert integral with or attached to the breech plug for sealingly engaging against a primer opening inside a cartridge case, the breech plug and the insert together defining a bore to allow a flame from an ignited primer to travel to a projectile propellant at the breech end of the barrel, and to provide a seal between the receiver and the barrel; a substantially cylindrical bolt aligned with the longitudinal axis without radially projecting the lug that is recipricatable and partially rotatable within the receiver between an open position in which the breech end of the barrel is accessible for loading or removing the cartridge casing and a closed position in which an end of the bolt can compressibly engage against the casing adjacent the primer cartridge, the bolt having a camming groove with a first section that extends longitudinally parallel to the axis and a second section that extends at an angle from a rearward end of the first section; and a pin that extends through a wall of the receiver and engages the camming groove to guide the bolt and lock the bolt against the primer at the face end of the ignition casing when it is loaded into the receiver, the camming groove and the metal pin configure to compress the face end of the ignition casing against the breech plug when the bolt is rotated into the closed position. In certain embodiments, the pin is threaded to facilitate removal of the pin from the receiver and for removal of the bolt from the receiver. In certain embodiments, the breech plug includes external threads and the breech end of the barrel includes internal threads engagable with the external threads of the breech plug.

Disclosed is a bolt and receiver dedicated muzzle loading, bolt action firearm that utilizes a modern configuration.

The muzzle loading firearm can employ a greatly modified cartridge bolt receiver without locking lugs that would normally project radially from the bolt adjacent the breech or forward end of the bolt, and a bolt that does not have locking lugs projecting from the forward end of the bolt. The absence of locking lugs and preferably raceways for the locking lugs prevents the firearm from being easily converted from a muzzle loading firearm into a center fire firearm. Without locking lugs on the bolt, and channels in the receiver for receiving the locking lugs, the bolt would not have sufficient locking strength to withstand the pressure from a modern cartridge. In a muzzle loading firearm, the pressure generated by the projectile propellant during firing is kept forward of the barrel breech by the breech plug, and thus locking lugs are not required. It would require a new bolt with locking lugs and a receiver with raceways to convert the muzzle loading firearm into a center fire firearm.

In certain embodiments, the muzzle loading firearm has a barrel having a breech end and a center bore, a receiver at the breech end of the barrel, and a breech plug located at the breech end of the barrel. An insert integral with or attached to the breech plug is provided for sealingly engaging against a primer opening in a cartridge case. The breech plug and insert together define a bore that allows a flame from an ignited primer inside the cartridge case to travel through the insert to a projectile propellant located at the breech end of the barrel forward of the breech plug. The breech plug and insert together also provide a seal for the barrel with the cartridge case.

The bolt that is substantially cylindrical without radially projecting lugs is recipricatable and partially rotatable within the receiver between an open position in which the breech end of the barrel is accessible for loading or removing the cartridge casing and a closed position in which an end of the bolt can compressibly engage against a primed cartridge case. The bolt includes a groove with a first section that extends longitudinally along the longitudinal axis and a second section that extends arcuately at an angle from a rearward end of the first section as a continuous channel. A pin extends through a wall of the receiver and engages the groove to move the bolt and lock the bolt to be compressed against a primer end of the ignition casing when the casing is loaded into the receiver. The ramming groove and metal pin are configured to compress a face end of the ignition cartridge casing against the insert inside face of a cartridge case when the bolt is rotated into the closed position.

The pin can be threaded to facilitate removal of the pin and the bolt from the receiver. The diameter of the bore extending through the insert can be substantially the same as a diameter of an opening in a head of a cartridge casing adjacent a primer.

BRIEF DESCRIPTION OF THE DRAWINGS

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FIG. 1 is a side view of a barrel and action for the muzzle loading firearm with a longitudinal axis A-A.

FIG. 1A is an elevational view of the breech end of the cartridge shown in FIG. 1.

FIG. 1B is a cross-sectional view of the cartridge shown in FIG. 1.

FIG. 2 is a vertical cross-sectional view of the barrel and part of the action shown in FIG. 1.

FIG. 3 is a perspective view of the new bolt used in the receiver.

FIG. 3A is a cross-sectional view of the bolt shown in FIG. 3.

FIG. 4 is a perspective view of the barrel and action shown in FIG. 1.

FIG. 5 is a vertical cross-sectional view of the barrel and part of the bolt and receiver action shown in FIG. 1, with the bolt in the closed position, ready for firing.

FIG. 6 is a vertical cross-sectional view of the barrel and action shown in FIG. 1, with the bolt in the closed position and the firing pin engaged with a primer in the cartridge casing to ignite the powder in the barrel.

FIG. 7 is a perspective view of a breech plug and insert mounted in the breech end of the barrel.

FIG. 8 is a side view of the barrel and the breech plug illustrating how the breech plug is installed in the barrel.

FIG. 9 is an end view as seen along view lines B-B of FIG. 8.

DETAILED DESCRIPTION

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OF THE ILLUSTRATED EMBODIMENT




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stats Patent Info
Application #
US 20140082981 A1
Publish Date
03/27/2014
Document #
File Date
12/31/1969
USPTO Class
Other USPTO Classes
International Class
/
Drawings
0


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Firearms   Muzzle Loaders  

Browse patents:
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20140327|20140082981|bolt action muzzle loading firearm|A muzzle loading firearm includes a barrel, a receiver, and a breech plug located at the breech end of the barrel. An insert integral with or attached to the breech plug provides sealing engagement against an opening in a cartridge case. The breech plug and insert together define a bore |
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