公开(公告)号：US12247803B1

公开(公告)日：2025-03-11

申请号：US18137173

申请日：2023-04-20

Applicant: James J. Kempf

Inventor： James J. Kempf

IPC: F41B5/00 ,  F41B5/12 ,  F41B5/14

Abstract: A crossbow with an inertia brake cocking device preferably utilizes a one-way bearing to control rotation of the drive unit used to wind (take-up) an elongated connecting device. Functional properties of an inertia brake mechanism (IBM) are well known. In its simplest form, an IBM has at least a first plate floating within a cavity, the first plate having a protrusion along an edge, and the cavity having recesses radially about its perimeter. Under controlled rotation in either direction, the IBM allows for the unrestricted rotation of the mechanism to which it is coupled. If the IBM senses a rapid acceleration of the spool, inertia moves the plate to engage a recess in the perimeter of the cavity, stopping uncontrolled rotation of the spool.

公开(公告)号：US10690436B1

公开(公告)日：2020-06-23

申请号：US16360122

申请日：2019-03-21

Applicant: James J. Kempf ,  Rex E. Isenhower

Inventor： James J. Kempf ,  Rex E. Isenhower

IPC: F41B5/12 ,  F41B5/14

Abstract: A crossbow having a built in manual cocking mechanism that may also be utilized with an optional built in, removable motor gearbox assembly and power source. The motor gearbox assembly may or may not have a clutch assembly, whereby rotational force reaches a predetermined amount, rotation of the drive shaft ceases. Switches may be provided to start, stop, and reverse the direction of rotation of the motor gearbox assembly, as well as switches and or circuits that may control operation of the motor gear set.

公开(公告)号：US10458742B1

公开(公告)日：2019-10-29

申请号：US16185846

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 projectile launching device includes self-timing without cam lean. The projectile launching device may include a rail, a riser, two energy storing components, (such as two limbs), two cams, a launch string, and at least two cables. The ends of the launch string are attached to the two cams. Opposing ends of first and second cables are coupled to the first and second cams. A mid-portion of the first and second cables are slideably engaged with the first and second cable pulleys, respectively. The two cams are preferably built as mirror images of each other at a centerline of the rail. The two cams include a launch string track, having identical, but mirrored, upper and lower cable tracks.

公开(公告)号：US10139191B1

公开(公告)日：2018-11-27

申请号：US15897292

申请日：2018-02-15

Applicant: James J. Kempf ,  Rex E. Isenhower

Inventor： James J. Kempf ,  Rex E. Isenhower

IPC: F41B5/10 ,  F41B5/12

Abstract: An extreme reverse style crossbow, a reverse style crossbow or a reverse style crossbow with a single stirrup includes two cams, one string, two pulleys and two cables. The pulleys are rotatably retained on the limbs, adjacent the two cams. A dual stirrup crossbow includes two cams, one string, two pulleys and one cable. The two pulleys are rotatably retained on two cam axles. A second dual stirrup crossbow includes two cams, one string, two pulleys and two cables. The two pulleys are rotatably retained on two cam axles. A non-conventional crossbow includes two cams, one string, two pulleys and one cable. The two cams are rotatably retained on limbs between the proximal and distal ends thereof. The two pulleys are rotatably retained on two cam axles. A vertical bow includes two cams, one string, two pulleys and one cable. The two pulleys are rotatably retained on two cam axles.

公开(公告)号：US10048036B1

公开(公告)日：2018-08-14

申请号：US15795292

申请日：2017-10-27

Applicant: James J. Kempf ,  Rex E. Isenhower

Inventor： James J. Kempf ,  Rex E. Isenhower

IPC: F41B5/12 ,  F41B5/10

Abstract: A projectile launching device includes self-timing without cam lean. The projectile launching device may include a rail, a riser, two energy storing components, (such as two limbs), two cams, a launch string, and at least one cable. The ends of the launch string are attached to the two cams. Opposing ends of first and second cables may be coupled to the rail or riser. A mid-portion of the first and second cables are slideably engaged with the first and second cams, respectively. Alternatively, a single cable may replace the first and second cables. The two cams are preferably built as mirror images of each other at a centerline of the rail. The two cams include a launch string track, having identical, but mirrored, upper and lower cable tracks.

公开(公告)号：US09759509B1

公开(公告)日：2017-09-12

申请号：US15433054

申请日：2017-02-15

Applicant: James J. Kempf ,  Rex E. Isenhower

Inventor： James J. Kempf ,  Rex E. Isenhower

IPC: F41B5/12

CPC classification number: F41B5/123

Abstract: A projectile launching device includes self-timing without cam lean. The projectile launching device includes a riser, a rail, two energy storing components, (such as two limbs), two cams, a launch string, and least one cable. The ends of the launch string are attached to the two cams. Opposing ends of first and second cables are coupled to the rail. A mid-portion of the first and second cables are slidably engaged with the first and second cams, respectively. Alternatively, a single cable may replace the first and second cables. The two cams are preferably built as mirror images of each other at a centerline of the rail. The two cams include a launch string track, having identical, but mirrored, upper and lower cable tracks.

公开(公告)号：US09513080B1

公开(公告)日：2016-12-06

申请号：US15046472

申请日：2016-02-18

Applicant: James J. Kempf ,  Rex E. Isenhower

Inventor： James J. Kempf ,  Rex E. Isenhower

IPC: F41B5/12 ,  F41B5/10 ,  F41B5/14

CPC classification number: F41B5/123 ,  F41B5/105 ,  F41B5/1411

Abstract: A reverse style crossbow preferably includes a bow riser, a barrel, a latch, a first limb, a second limb, a first cam, a second cam, a first string pulley, a second string pulley and a bowstring. The riser is attached to the barrel at substantially a middle thereof. The first limb extends from a first end of the riser and the second limb extends from a second end of the riser. The first cam is pivotally retained on a distal end of the first limb and the second cam is pivotally retained on a distal end of the second limb. The latch is attached to a top of the barrel. The riser may be located in front of the latch, behind the latch or under the latch. The first string pulley extends from one side of the barrel and the second string pulley extends from an opposing side thereof.

Abstract translation: 反向式弩优选地包括弓形立管，枪管，闩锁，第一肢体，第二肢体，第一凸轮，第二凸轮，第一绳带轮，第二绳带轮和弓弦。 提升管在其基本上的中间附接到桶。 第一肢从提升管的第一端延伸，第二肢从提升管的第二端延伸。 第一凸轮被枢转地保持在第一肢体的远端上，并且第二凸轮枢转地保持在第二肢体的远端上。 闩锁连接到枪管的顶部。 提升管可以位于闩锁的前面，闩锁后面或闩锁下方。 第一绳带轮从筒的一侧延伸，第二绳带轮从其相对侧延伸。

公开(公告)号：US09377267B1

公开(公告)日：2016-06-28

申请号：US14558827

申请日：2014-12-03

Applicant: James J. Kempf

Inventor： James J. Kempf

IPC: F41B5/10 ,  F41B5/12

CPC classification number: F41B5/105 ,  F41B5/10 ,  F41B5/12 ,  F41B5/123 ,  Y10S124/90

Abstract: A shooting bow with transition modules includes two string cams, two cables, a bow string, two limbs and a bow riser. The shooting bow may be a cross bow or a vertical bow. The first and second limbs extend from each end of the bow riser. The first and second cams are pivotally retained on the first and second limbs. The first and second cams retain a bowstring. The first and second cams retain the first and second cables. Each cam includes a cam ring, a cam hub and a transition module. The bow string is retained on cam ring. The cam hub includes an upper track, which continues to a lower track. The transition module includes a cable track. The cam hubs and the transition modules allow the cams to be rotated as much as 330 degrees.

Abstract translation: 具有过渡模块的射击弓包括两个琴弦凸轮，两根电缆，一个弓弦，两个肢体和一个弓形提升器。 射击弓可能是十字弓或垂直弓。 第一和第二肢从弓提升管的每一端延伸。 第一和第二凸轮被枢转地保持在第一和第二分支上。 第一和第二凸轮保持弓弦。 第一和第二凸轮保持第一和第二电缆。 每个凸轮包括凸轮环，凸轮毂和过渡模块。 弓弦线保持在凸轮环上。 凸轮毂包括一个继续向下轨道的上轨道。 转换模块包括电缆轨道。 凸轮毂和过渡模块允许凸轮旋转多达330度。

公开(公告)号：US09255754B1

公开(公告)日：2016-02-09

申请号：US14146177

申请日：2014-01-02

Applicant: James J. Kempf

Inventor： James J. Kempf

IPC: F41B5/12

CPC classification number: F41B5/12

Abstract: An improved crossbow lock mechanism includes a trigger housing, a seer lever, a seer lock lever, a latch and a trigger. The seer lever includes an anti-dryfiring projection and a latch projection. The seer lever pivots relative to the trigger housing. The latch includes an arrow shaft yoke and a seer notch. The latch pivots relative to trigger housing. The seer notch engages the latch projection. The seer lock lever includes a latch finger and an impact finger. The latch finger is sized to capture the anti-dryfiring projection. A bow string is pulled back, until the seer notch of the latch is locked behind the latch projection. A nock of an arrow shaft is inserted over the bow string. The trigger lever is pulled, which causes the trigger linkage to push the latch projection downward and allow the latch to release the bow string.

Abstract translation: 改进的十字弓锁定机构包括触发器壳体，检测杆，检查锁定杆，闩锁和触发器。 拾音杆包括防干烧发射突起和闩锁突起。 检查杆相对于触发器壳体枢转。 闩锁包括箭头轴轭和塞子槽。 闩锁相对于触发器壳体枢转。 塞子槽口接合闩锁突起。 塞子锁杆包括闩锁指和撞击指。 闩锁手指的大小适于捕获防干烧发射。 弓弦被拉回，直到闩锁的先端槽锁定在闩锁突起后面。 弓箭杆上插入一个箭头轴。 触发杆被拉动，这导致触发器连杆向下推动闩锁突起并允许闩锁释放弓弦。

公开(公告)号：US20110253118A1

公开(公告)日：2011-10-20

申请号：US13066146

申请日：2011-04-07

Applicant: James J. Kempf

Inventor： James J. Kempf

IPC: F41B5/18

CPC classification number: F41B5/1469 ,  F41A19/10 ,  F41B5/12 ,  F41B5/123

Abstract: A trigger assembly for a crossbow or other weapon system. The trigger assembly includes a trigger arm coupled between a trigger and a sear. The trigger arm is not parallel to the line of fire, thereby allowing for increased mechanical advantage and a smoother, safer trigger pull. The trigger assembly incorporates various safety measures, including a dry fire mechanism which prevents the unintentional damaging and potentially dangerous release of the bowstring before an arrow is positioned on the rail of the crossbow. The trigger assembly allows for various adjustments to vary the trigger length and pull, while maintaining smoothness and preventing the unintentional or inadvertent release of the bowstring.

Abstract translation: 用于弩或其他武器系统的扳机组件。 触发器组件包括耦合在触发器和触发器之间的触发臂。 触发臂不平行于火线，从而允许增加机械优点和更平滑，更安全的触发器拉动。 触发器组合包括各种安全措施，包括干火防止机构，其防止在箭头定位在弩弓的轨道之前的无意的损坏和潜在的危险释放弓弦。 触发器组件允许各种调整以改变触发器长度和拉力，同时保持平滑度并防止弓弦的无意或无意的释放。