公开(公告)号：US20100269807A1

公开(公告)日：2010-10-28

申请号：US11656845

申请日：2007-01-23

Applicant: James J. Kempf

Inventor： James J. Kempf

IPC: F41B5/12

CPC classification number: F41B5/12

Abstract: A crossbow with an improved cocking assembly. The improvement includes a means for automatically disengaging a hook associated with a cocking assembly from a bowstring once the bowstring has been drawn the desired distance behind a bowstring retainer. The automatic disengagement of the hook from the bowstring reduces movement and sound associated with disengagement, and reduces the likelihood of injury associated with placement of the fingers in front of the cocked bowstring. The disengagement mechanism may either be mechanical or magnetic as desired.

Abstract translation: 具有改进的起动组件的弩。 该改进包括一旦弓弦已被拉伸到弓弦保持器后面所需距离的位置，则自动地将与起弧组件相关联的钩子与弓弦杆分离的装置。 钩子与弓弦杆的自动分离减少与脱离相关联的运动和声音，并且减少与在翘起的弓弦前面放置手指相关的受伤的可能性。 分离机构可以根据需要是机械的或磁性的。

公开(公告)号：US12215954B1

公开(公告)日：2025-02-04

申请号：US17993077

申请日：2022-11-23

Applicant: James J. Kempf

Inventor： James J. Kempf

IPC: F41B5/12 ,  F41B5/14

Abstract: A cranking mechanism preferably includes a planetary gear, a drive shaft, a one way bearing, a clutch assembly, and at least one drive unit. The clutch preferably includes a clutch pressure plate, a flywheel, friction surfaces and at least one friction plate. Each drive unit includes a carrier, a spool and a flywheel. The one way bearing and the clutch assembly are axial on the drive shaft. A pressure locking nut is threaded on to a threaded end of the crank shaft to exert pressure on the clutch assembly. The sun gear is fixed on the drive shaft. The at least one drive unit is axial with the drive shaft, and fixed with the carrier of the planetary gear set. The pressure locking nut is tightened against the clutch assembly to frictionally engage the drive shaft with the at least one drive unit.

公开(公告)号：US10514227B1

公开(公告)日：2019-12-24

申请号：US16185523

申请日：2018-11-09

Applicant: James J. Kempf ,  Rex E. Isenhower

Inventor： James J. Kempf ,  Rex E. Isenhower

IPC: F41B5/12 ,  F41B5/10

Abstract: A multi-draw weight archery bow with cable timing includes a shooting bow and a timing-draw device. The shooting bow includes a riser, a barrel, a first limb, a second limb, a first cam, a second cam, a bowstring, a first cable and a second cable. A rotational timing-draw device includes a rotational timing housing and a rotational timing hub. The rotational timing housing is mounted in a limb. A cable is secured to the rotational timing hub and the rotational timing hub is secured to the rotational timing housing. A multi-position draw weight and rotation device includes a multi-position and rotational draw timing hub and the rotational timing housing. The end of a cable is secured to one of four positions on the multi-position and rotation draw timing hub. A multi-position draw weight device includes a multi-position adjustable draw weight plate and a timing housing.

公开(公告)号：US10458743B1

公开(公告)日：2019-10-29

申请号：US15995229

申请日：2018-06-01

Applicant: James J. Kempf ,  Rex E. Isenhower ,  Dorge O. Huang

Inventor： James J. Kempf ,  Rex E. Isenhower ,  Dorge O. Huang

IPC: F41B5/14 ,  F41B5/12

Abstract: A crossbow with built in cocking device includes a manual crank and a built-in, removable motor gearbox assembly and power source. Rotational forces applied to a drive shaft rotate in a first direction, causing first and second string carriages to engage a bow string, moving the bow string towards a string catch. Once the string catch is latched to the bow string, a drive shaft is rotated in a second direction to move first and second string carriages to the a rest position.

公开(公告)号：US10066894B1

公开(公告)日：2018-09-04

申请号：US15626207

申请日：2017-06-19

Applicant: James J. Kempf ,  Rex E. Isenhower

Inventor： James J. Kempf ,  Rex E. Isenhower

IPC: F41B5/12 ,  F41B5/14

Abstract: An improved crossbow lock mechanism assembly includes a trigger housing, a seer lever, a seer lock lever, a latch, trigger, a spring, a detent ball, and a safety slide bar having one ball detent. Selectively positioning the safety slide bar in a safe position, the spring forces the detent ball into a safety detent notch, which holds the safety bar in safety position, thus preventing movement of the seer lever. Selectively positioning the safety slide bar in a fire position results in the spring creating friction between the ball and safety bar, thus holding safety bar in place and allowing movement of the seer lever. A second embodiment uses a pivoting safety lock lever. The engagement of the seer lever with the string latch is indirect, because of a roller pin spaced therebetween. A third embodiment includes a safety slide bar, which makes indirect contact with the seer lever.

公开(公告)号：US10012468B1

公开(公告)日：2018-07-03

申请号：US15683808

申请日：2017-08-23

Applicant: James J. Kempf ,  Rex E. Isenhower

Inventor： James J. Kempf ,  Rex E. Isenhower

IPC: F41B5/12 ,  F41B5/14 ,  F21V33/00 ,  F42B6/04

CPC classification number: F41B5/1469 ,  F21V33/008 ,  F41B5/12 ,  F42B6/04

Abstract: A self-centering anti-dry fire device for a crossbow n improved crossbow lock mechanism assembly includes a trigger housing, a string latch, a seer lever, a combination arrow self-centering anti-dry fire and seer lock lever, a trigger and a safety slide bar. An arrow cavity is formed in a top of the combination arrow self-centering anti-dry fire and seer lock lever. A cross section of the arrow cavity may have a “V” shape, a curved shape, a notch shape or any other suitable shape. The arrow cavity ensures that the arrow shaft is centered relative to a centerline of a barrel of the crossbow.

公开(公告)号：US09696107B1

公开(公告)日：2017-07-04

申请号：US14940822

申请日：2015-11-13

Applicant: James J. Kempf ,  Rex E. Isenhower

Inventor： James J. Kempf ,  Rex E. Isenhower

IPC: F41B5/12

CPC classification number: F41B5/123 ,  F41B5/12

Abstract: A multi-element one piece reverse draw style crossbow frame preferably includes a riser element, an AR style stock receiver tube element, a barrel element, a foot stirrup element, a first limb pocket element and a second limb pocket element, which are molded as a single piece of material. A first limb and a second limb are attached to the riser element. A first cam is pivotally retained on a distal end of the first limb and a second cam is pivotally retained on a distal end of a second limb. The barrel element preferably includes an opening for a trigger box, stock mounting points, an integrated finger guard, accessory mounting points and the like. A multi-element one piece dual stirrup crossbow frame preferably includes a barrel element, a riser element, a first foot stirrup element and a second foot stirrup element, which are molded as a single piece of material.

公开(公告)号：US09291421B1

公开(公告)日：2016-03-22

申请号：US14554290

申请日：2014-11-26

Applicant: James J. Kempf

Inventor： James J. Kempf

IPC: F41B5/12 ,  F41B5/14 ,  F41C23/00 ,  F41C23/14

CPC classification number: F41B5/12 ,  F41B5/123 ,  F41B5/14 ,  F41C23/14

Abstract: A shooting crossbow includes two cams, two pulleys, a bow string, two cables, a string latch housing, a bow riser, a mainframe barrel and two limbs. The bow riser is enjoined with the barrel. The first and second limbs extend from the bow riser. First and second cams are pivotally retained on first and second limbs. The first and second cams retain a bowstring. The cams and pulleys retain first and second cables. The two pulleys are retained on the barrel. The mainframe barrel combines elements of an AR style butt stock mounting tube, and flight deck elements of a crossbow barrel extrusion.

Abstract translation: 射击弩包括两个凸轮，两个滑轮，一个弓弦，两个电缆，一个弦乐器闩锁壳体，一个弓提升，一个主机筒和两个肢体。 弓提升管被枪管。 第一和第二肢从弓形提升器延伸。 第一和第二凸轮枢转地保持在第一和第二肢上。 第一和第二凸轮保持弓弦。 凸轮和皮带​​轮保留第一和第二根电缆。 两个皮带轮保留在机筒上。 主机桶结合了AR风格对接库存安装管的元件，以及弩斗挤出件的飞行甲板元件。

公开(公告)号：US09038619B1

公开(公告)日：2015-05-26

申请号：US14558005

申请日：2014-12-02

Applicant: James J. Kempf

Inventor： James J. Kempf

IPC: F41B5/20 ,  F41B5/12 ,  F41B5/14 ,  A63B59/00

CPC classification number: F41B5/1426 ,  A63B60/54 ,  A63B2244/04 ,  F41B5/12

Abstract: A vibration dampened barrel for a crossbow preferably includes at least two vibration dampening chambers, which extend at least a portion of a length of the vibration dampened barrel. The at least two vibration dampening chambers are at least partially filled with a vibration dampening material, such as silicone, rubber, low density foam, high density foam, or any other suitable material that absorbs noise and or vibration. The vibration dampening material is preferably applied by injection, compression, spray, pouring or any other suitable method. The vibration dampening material is retained in the at least two vibration dampening chambers by curing or hardening; mechanically confinement including the use of fasteners or a plug; or with any other suitable method. The at least two vibration dampening chambers may be partially or fully filled. The vibration dampening material may also be placed on a surface inside an extruded barrel.

Abstract translation: 优选地，用于弩的振动阻尼桶包括至少两个减振室，所述至少两个减振室延伸所述减振筒的长度的至少一部分。 所述至少两个减振室至少部分地填充有减振材料，例如硅树脂，橡胶，低密度泡沫，高密度泡沫或吸收噪音和/或振动的任何其它合适的材料。 振动阻尼材料优选通过注射，压缩，喷雾，浇注或任何其它合适的方法施加。 振动阻尼材料通过固化或硬化保持在至少两个减振室中; 机械限制，包括使用紧固件或插头; 或用任何其他合适的方法。 该至少两个减振室可以部分地或完全地被填充。 振动阻尼材料也可以放置在挤压桶内的表面上。

公开(公告)号：USD665821S1

公开(公告)日：2012-08-21

申请号：US29406501

申请日：2011-11-15

Applicant: Michael Capko ,  David Andrew Jacobs ,  Timothy K. Keighron ,  Jongkyu Kim ,  James J. Kempf

Designer： Michael Capko ,  David Andrew Jacobs ,  Timothy K. Keighron ,  Jongkyu Kim ,  James J. Kempf