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Rotary cam release trigger device for a crossbow

  • US 9,404,705 B2
  • Filed: 10/13/2013
  • Issued: 08/02/2016
  • Est. Priority Date: 10/14/2012
  • Status: Active Grant
First Claim
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1. A rotary cam release device (30) for a crossbow (34) comprised of:

  • a. a spring operated safety hammer (70) with a cam ball lobe (73) for engaging a rotary cam (60), a sear stop extension leg (74) with a safety hammer to sear flat (52A) for engaging a spring operated, pivotal sear (50), and a pivot aperture (72) for a pivot pin (44);

    b. the spring operated, pivotal sear (50) with a sear to safety hammer flat (52) for engaging the spring operated safety hammer (70), a sear to cam interference flat (53) for engaging the rotary cam (60), and an aperture 50A means for engaging a linkage (85);

    c. a contiguous flat (53) between the safety hammer to sear flat (52A) of the sear and the sear to safety hammer flat (52);

    d. the 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 a dry fire cam (80), and[5] a spring detent ball (62) to engage the means of engagement with the safety hammer (70);

    e. a contiguous interface flat whereby the interface flat (53) of the spring operated, rotary cam (60) engages the interface flat (63) of the rotary cam (60) whereby the each of the flats (53, 63) is further configured as a back angle approximately 7-10 degrees and counter clockwise off 12 o'"'"'clock or approximately angled 350 to 353 degrees with continuous interface;

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

    g. a rotation means (92A) between an encasement housing (40) and rotary cam (60);

    h. the encasement housing (40) that is essentially configured to contain a set of components which includes the spring operated, pivotal sear (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);

    i. 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);

    j. 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);

    k. the linkage (85) with a apertures (85A, 86A) for connecting to the sear (50) and to a trigger pull (86);

    l. the trigger pull (86); and

    m. a pair of pins (50B) for connecting the linkage (85) to the sear (50) and the linkage (85) to the trigger (86), respectively;

    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).

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