Bow utilizing arcuate compression members to store energy
View Patent ↗According to one embodiment, a bow includes a handle portion and a bowstring. Compression members including primary compression elements and secondary compression elements are positioned on the ends of the handle portion. The compression elements are arcuate in shape and joined at the ends. As the bowstring is drawn, the compression members are compressed and energy is stored therein. The bow can include limbs that do not significantly deform or store energy as the bow is drawn. Upon release of the bowstring, the stored energy is rapidly returned to the bowstring.
1. A bow comprising:
a handle portion;
a first compression member coupled to said handle portion;
a second compression member coupled to said handle portion; and
a bowstring coupled to said first compression member and said second compression member, wherein said bowstring is configured to compress said first and second compression members when drawn;
wherein said first and second compression members each include:
a primary compression element having a first and second end, wherein said primary compression member is in the form of an arc having a first radius of curvature; and
at least one secondary compression element having a first and second end, wherein said secondary compression member is in the form of an arc having a second radius of curvature, said first and second radius of curvature being different;
wherein said first and second ends of said primary compression element are joined to said first and second ends of said secondary compression element respectively.
2. The bow of claim 1 , further comprising:
an upper limb member having a proximal end and a distal end, said distal end of said upper limb member being coupled to said handle portion, said proximal end of said upper limb member extending up from said handle portion and coupled to said first compression member; and
a lower limb member having a proximal end and a distal end, said distal end of said lower limb member being coupled to said handle portion, said proximal end of said lower limb member extending down from said handle portion and coupled to said second compression member.
3. The bow of claim 2 , wherein said compression members coupled to said upper and said lower limb extend toward said handle portion.
4. The bow of claim 3 , wherein said bowstring is slideably secured to said proximal end of said upper limb member and slideably secured to said proximal end of said lower limb member.
5. The bow of claim 4 , further comprising one of a notch, a loop, a groove, an eyelet, or a grommet disposed on said proximal end of said upper limb member and said proximal end of said lower limb member.
6. The bow of claim 3 , further comprising:
a first pulley disposed on said proximal end of said upper limb member; and
a second pulley disposed on said proximal end of said lower limb member;
wherein said bowstring passes through said first pulley and said second pulley prior to coupling said compression members.
7. The bow of claim 2 , wherein said compression members coupled to said upper and said lower limb extend away from said handle portion.
8. The bow of claim 7 , wherein said bowstring is slideably secured to said proximal end of said upper limb member and slideably secured to said proximal end of said lower limb member.
9. The bow of claim 8 , further comprising one of a notch, a loop, a groove, an eyelet, or a grommet disposed on said proximal end of said upper limb member and said proximal end of said lower limb member.
10. The bow of claim 7 , further comprising:
a first pulley disposed on said proximal end of said upper limb member; and
a second pulley disposed on said proximal end of said lower limb member;
wherein said bowstring passes through said first pulley and said second pulley prior to coupling said compression members.
11. The bow of claim 1 , wherein said first and said second compression elements of said first and second compression members are coupled to form a crescent shaped cross section.
12. The bow of claim 1 , wherein said first and second compression members comprise a composite material with fiber in a resin matrix.
13. The bow of claim 1 , wherein said first and second compression members are configured to store energy as they are compressed by a drawing of said bowstring; and
wherein said compression members rapidly return said energy to said bowstring when said bowstring is released, causing said bowstring to thrust toward said handle portion.
14. The bow of claim 1 , wherein said compression members are configured to provide let-off when said bowstring is fully drawn.
15. A bow comprising:
a handle portion;
an upper limb member having a proximal end and a distal end, said distal end of said upper limb member being coupled to said handle portion, said proximal end of said upper limb member extending up from said handle portion;
a lower limb member having a proximal end and a distal end, said distal end of said lower limb member being coupled to said handle portion, said proximal end of said lower limb member extending down from said handle portion;
a first compression member coupled to said proximal end of said upper limb;
a second compression member coupled to said proximal end of said lower limb; and
a bowstring coupled to said first compression member and said second compression member, wherein said bowstring is configured to compress said first and second compression members when drawn;
wherein said first and second compression members each include:
a primary compression element having a first and second end, wherein said primary compression member is in the form of an arc having a first radius of curvature; and
at least one secondary compression element having a first and second end, wherein said secondary compression member is in the form of an arc having a second radius of curvature, said first and second radius of curvature being different;
wherein said first and second ends of said primary compression element are joined to said first and second ends of said secondary compression element;
wherein said first and said second compression elements of said first and second compression members are coupled to form a crescent shaped cross section;
wherein said first and second compression members comprise a composite material with fiber in a resin matrix; and
wherein said compression members are configured to provide let-off when said bowstring is fully drawn.
16. The bow of claim 15 , wherein said compression members coupled to said upper and said lower limb extend toward said handle portion.
17. The bow of claim 15 , wherein said compression members coupled to said upper and said lower limb extend away from said handle portion.
18. The bow of claim 15 , further comprising:
a first eccentric disposed on said proximal end of said upper limb member; and
a second eccentric disposed on said proximal end of said lower limb member;
wherein said bowstring being configured to actuate said eccentrics; and
wherein said eccentrics are mechanically connected to said compression members so as to compress said compression members as said bowstring is pulled away from said handle portion.
19. The bow of claim of 18 , wherein said eccentrics provide a mechanical advantage in compressing said compression members as said bowstring is pulled away from said handle portion, and wherein said mechanical advantage provides additional let-off at full draw length.
20. A bow comprising:
a handle portion;
an upper limb member having a proximal end and a distal end, said distal end of said upper limb member being coupled to said handle portion, said proximal end of said upper limb member extending up from said handle portion, said upper limb member being sufficiently rigid to resist any significant deformation as said bow is fired;
a lower limb member having a proximal end and a distal end, said distal end of said lower limb member being coupled to said handle portion, said proximal end of said lower limb member extending down from said handle portion, said lower limb member being sufficiently rigid to resist any significant deformation as said bow is fired;
a first compression member coupled to said proximal end of said upper limb;
a second compression member coupled to said proximal end of said lower limb; and
a bowstring coupled to said first compression member and said second compression member, wherein said bowstring is configured to compress said first and second compression members when drawn;
wherein said first and second compression members each include a primary arcuate compression element and at least one secondary arcuate compression element.