Rotary Cam Release Trigger device for a Crossbow

• US 20140102431A1
• Filed: 10/13/2013
• Published: 04/17/2014
• Est. Priority Date: 10/14/2012
• Status: Active Grant

• Current Assignee: Bennie Kennedy
• Original Assignee: Bennie Kennedy
• Inventors: Kennedy, Bennie
• Granted Patent: US 9,404,705 B2
• Time in Patent Office: Days
• US Class Current: 124/35.1
• CPC Class Codes: F41B 5/12 Crossbows
• CPC Class Codes: F41B 5/1469 Bow-string drawing or releasing devices F41B5/1473 takes precedence

Abstract

A crossbow trigger and bowstring release mechanism with improved bowstring retention and release characteristics. The device enhances accurate and safe shooting with the crossbow. The trigger mechanism comprises a spring operated pivotal cam string release mechanism for releasably holding a bowstring in a drawn position. The string release latch is pivotable about a pivot point and has associated therewith a first sear surface. The trigger mechanism further includes a pivotal rocker latch member having a second sear surface which engages the cam pivot mechanism. The sear has an extended arm that engages a safety hammer release. Finally there is an improved dry-fire prevention pivot mechanism that engages an arrow when loaded to launch. When no arrow is present the dry-fire rocker engages the cam mechanism and prevents the movement of the cam to release the bowstring.

Claims

1. A rotary cam release device (30) for a crossbow (34) comprised of:

a. a spring operated safety hammer (70) with a means for engaging a rotary cam (60) and engaging a spring operated, pivotal sear (50);

b. the means for engaging a rotary cam (60) and a sear (50);

c. the spring operated, pivotal sear rocker latch member (50) with a means for engaging the rotary cam (60), with a means for engaging the safety hammer (70), and with a means for engaging a linkage (85);

d. the means (50A, 85A) for connecting the linkage (85) and the sear (50);

e. the linkage (85) with a means (85B, 86A) for connecting to a trigger pull (86);

f. the means (85B, 86A) for connecting the linkage (85) and the trigger pull (86);

g. the trigger pull (86);

h. the spring operated, rotary cam (60) further comprised of

[1] a bowstring claw (69), for releasably holding a bowstring (90) in a drawn position,

[2] an interface flat (63) to engage the spring operated, pivotal sear (50),

[3] a pin (68) to engage a rotation means (92A, 92B);

[4] a pin (83) to engage the dry fire cam (80), and

[5] a spring detent ball (62) to engage the means of engagement with the safety hammer (70);

i. the rotation means (92A, 92B);

j. a spring operated, pivotal dry fire cam (80) with a means (83) for engaging the rotary cam (60);

k. a plurality of springs (91) interposed between an encasement housing (40) and the sear (50), the safety hammer (70), and the dry fire cam (80); and

l. a plurality of pins (42, 43, 44, and 45) interposed between the encasement housing (40) and the spring operated, pivotal sear rocker latch member (50), the safety hammer (70), the dry fire cam (80), and the rotary cam (60); and

m. the encasement housing (40) that is essentially configured to contain a set of components which includes the spring operated, pivotal sear rocker latch member (50), the safety hammer (70), the dry fire cam (80), the rotary cam (60), the springs (92A, 92B), and that provides an arrow notch (40C) and a structure to maintain pivotal-able and structural continuity to the release device (30);

wherein the release device (30) is mountable to the crossbow (34) on a set of slide rails (40A) and wherein the release device (30) provides a safe and reliable trigger mechanism which enhances accurate shooting with the crossbow (34).

2. The rotary cam release device (30) as in claim 1, wherein the sear rocker latch member (50), the safety hammer (70), the dry fire cam (80), the rotary cam (60) and the encasement housing (40) are comprised of materials from a group selected from the group consisting of various machined and cast metals including steel, steel alloys, stainless steel, composite materials, virgin plastics resins, reground plastic resins and reinforced plastic resins.

3. The rotary cam release device (30) as in claim 1, wherein the rotation means is a heavy duty tension springs (92A).

4. The rotary cam release device (30) as in claim 1, wherein the rotation means is a torsional spring (92B).

5. The rotary cam release device (30) as in claim 1 wherein the device (30) is further comprised of a cam stop (93) inserted in a cam pocket in the encasement housing (40).

6. The rotary cam release device (30) as in claim 1 wherein the safety hammer (70) is further comprised of a pivot aperture (72) for the pivot pin (44) and spring pocket (70A) for a spring (91).

7. The rotary cam release device (30) as in claim 1 wherein the means of the safety hammer (70) for engaging a rotary cam (60) is a safety hammer lobe (73) and the means for engaging the spring operated, pivotal sear rocker latch member (50) is a sear flat (52A).

8. The rotary cam release device (30) as in claim 1 wherein the spring operated, pivotal sear rocker latch member (50) is further comprised of a pivot aperture (54) for the pivot pin (45) and a spring pocket (55) for a spring (91).

9. The rotary cam release device (30) as in claim 1 wherein the means of the spring operated, pivotal sear rocker latch member (50) for engaging the rotary cam (60) is a flat (53).

10. The rotary cam release device (30) as in claim 1 wherein the means of the spring operated, pivotal sear rocker latch member (50) for engaging the safety hammer (70) is a flat (52).

11. The rotary cam release device (30) as in claim 1 wherein the means of the spring operated, pivotal sear rocker latch member (50) for engaging the linkage (85) is an aperture and pin (50A, 85A).

12. The rotary cam release device (30) as in claim 1 wherein the spring operated, rotary cam (60) is further comprised of a pivot aperture (65) for the pivot pin (42), an aperture for spring pin (68), and an aperture for dry fire pin (83).

13. The rotary cam release device (30) as in claim 12 wherein the spring operated, rotary cam (60) is further comprised of a stop flat (67) for the cushion (93).

14. The rotary cam release device (30) as in claim 1 wherein the interface flat (63) of the spring operated, rotary cam (60) is further configured as a flat angled approximately 7-10 degrees as a back angle and counter clockwise off 12 o'"'"'clock or approximately angled 350 to 353 degrees interface with the flat (53) of the spring operated, pivotal sear rocker latch member (50).

15. The rotary cam release device (30) as in claim 1 wherein the spring operated, pivotal dry fire cam (80) is further comprised of an arrow lobe means (80 A), a pivot aperture (83) to engage with pivot pin (43), and a dry fire notch (80B) to interfere with cam pin (83).

16. The rotary cam release device (30) as in claim 1 wherein the dry fire cam (80) is above and toward the top of the crossbow (34) and the arrow notch (40C) of the encasement housing (40).

17. A rotary cam release device (30) for a crossbow (34) comprised of:

a. spring operated safety hammer (70) further comprised of

[1] a means for engaging a rotary cam (60) and engaging a spring operated, pivotal sear (50),

[2] a pivot aperture (72) for the pivot pin (44), and

[3] a spring pocket (70A) for a spring (91);

b. the means for engaging a rotary cam (60) is a safety hammer lobe (73) and the means for engaging the spring operated, pivotal sear rocker latch member (50) is a sear flat (52A);

c. the spring operated, pivotal sear rocker latch member (50) is further comprised of;

[1] a pivot aperture (54) for the pivot pin (45),

[2] a spring pocket (55) for a spring (91),

[3] a means for engaging the rotary cam (60) is a flat (53),

[4] a means for engaging the safety hammer (70) the safety hammer (70) is a flat (52), and

[5] a means for engaging a linkage (85) is an aperture and pin;

d. the means (50A, 85A) for connecting the linkage (85) and the sear (50);

e. the linkage (85) with a means (85B, 86A) for connecting to a trigger pull (86);

f. the means (85B, 86A) for connecting the linkage (85) and the trigger pull (86);

g. the trigger pull (86);

h. a spring operated, rotary cam (60) further comprised of

[1] a bowstring claw (69), for releasably holding a bowstring (90) in a drawn position,

[2] an interface flat (63) to engage the spring operated, pivotal sear (50) whereby the interface flat (63) of the spring operated, rotary cam (60) is further configured as a flat angled approximately 7-10 degrees as a back angle and counter clockwise off 12 o'"'"'clock or approximately angled 350 to 353 degrees interface with the flat (53) of the spring operated, pivotal sear rocker latch member (50),

[3] a pin (68) to engage a rotation means (92A),

[4] a pin (83) to engage the dry fire cam (80), and

[5] a spring detent ball (62) to engage the means of engagement with the safety hammer (70);

[6] a pivot aperture (65) for the pivot pin (42), an aperture for spring pin (68) and an aperture for dry fire pin (83), and

[7] a stop flat (67) for cushion (93);

i. the rotation means consisting of a heavy duty tension springs (92A);

j. a spring operated, pivotal dry fire cam (80) with a means (83) for engaging the rotary cam (60);

k. a plurality of springs (91) interposed between an encasement housing (40) and the sear (50), the safety hammer (70), and the dry fire cam (80); and

l. a plurality of pins (42, 43, 44, and 45) interposed between the encasement housing (40) and the spring operated, pivotal sear rocker latch member (50), the safety hammer (70), the dry fire cam (80), and the rotary cam (60);

m. the encasement housing (40) that is essentially configured to contain a set of components which includes the spring operated, pivotal sear rocker latch member (50), the safety hammer (70), the dry fire cam (80), the rotary cam (60), the springs (92A, 92B), and that provides an arrow notch (40C) and a structure to maintain pivotal-able and structural continuity to the release device (30); and

n. a cam stop (93) inserted in a cam pocket in the encasement housing (40)

wherein the release device (30) is mountable to the crossbow (34) on a set of slide rails (40A) and wherein the release device (30) provides a safe and reliable trigger mechanism which enhances accurate shooting with the crossbow (34).

18. A rotary cam release device (30) for a crossbow (34) comprised of:

a. spring operated safety hammer (70) contiguous and releasably engaging a rotary cam (60) and a spring operated, pivotal sear rocker latch member (50);

b. the spring operated, pivotal sear rocker latch member (50) contiguous and releasably engaging safety hammer (70) and the rotary cam (60) and a linkage (85);

c. the linkage (85) contiguous and releasably engaging the spring operated, pivotal sear rocker latch member (50) and connected by a pivotal means to a trigger pull (86);

d. a dry fire cam (80) contiguous and releasably engaging the rotary cam (60);

e. the rotary cam (60) contiguous and releasably engaging the spring operated, pivotal sear rocker latch member (50);

the dry fire cam (80) and the safety hammer (70);

f. a rotation means for pivoting the rotary cam (60) consisting of a heavy duty tension springs (92A);

g. a plurality of springs (91) interposed between an encasement housing (40) and the sear (50), the safety hammer (70), and the dry fire cam (80); and

h. a plurality of pins (42, 43, 44, and 45) interposed between the encasement housing (40) and the spring operated, pivotal sear rocker latch member (50), the safety hammer (70), the dry fire cam (80), and the rotary cam (60);

i. the encasement housing (40) that is essentially configured to contain a set of components which includes the spring operated, pivotal sear rocker latch member (50), the safety hammer (70), the dry fire cam (80), the rotary cam (60), the spring (92A), and that provides an arrow notch (40C) and a structure to maintain pivotal-able and structural continuity to the release device (30); and

j. a cam stop (93) inserted in a cam pocket in the encasement housing (40)

wherein the release device (30) is mountable to the crossbow (34) on a set of slide rails (40A) and wherein the release device (30) provides a safe and reliable trigger mechanism which enhances accurate shooting with the crossbow (34).