Archery bow with wide ratio limb

Abstract

In some embodiments, an archery bow comprises a frame, a first limb assembly supporting a first rotatable member and a second limb assembly supporting a second rotatable member. The first rotatable member comprises a cam. A bowstring extends between the first rotatable member and the second rotatable member. A power cable is in communication with the cam. The first limb assembly has a width and a length, wherein the width is at least 26% of the length. In some embodiments, the width is at least 28% of the length.

Description

BACKGROUND OF THE INVENTION

This invention relates to archery bows, which are generally known in the art.

Archery bows typically use flexible limbs to store energy. The limbs can be highly stressed members. In some bows, the limbs are highly stressed even when the bow is at-rest, and the stress increases when the bow is drawn.

There remains a need for novel archery bow structures that prevent benefits over existing designs.

All US patents and applications and all other published documents mentioned anywhere in this application are incorporated herein by reference in their entirety.

Without limiting the scope of the invention a brief summary of some of the claimed embodiments of the invention is set forth below. Additional details of the summarized embodiments of the invention and/or additional embodiments of the invention may be found in the Detailed Description of the Invention below.

A brief abstract of the technical disclosure in the specification is provided as well only for the purposes of complying with 37 C.F.R. 1.72. The abstract is not intended to be used for interpreting the scope of the claims.

BRIEF SUMMARY OF THE INVENTION

In some embodiments, an archery bow comprises a frame, a first limb assembly supporting a first rotatable member and a second limb assembly supporting a second rotatable member. The first rotatable member comprises a cam. A bowstring extends between the first rotatable member and the second rotatable member. A power cable is in communication with the cam. The first limb assembly has a width and a length, wherein the width is at least 26% of the length. In some embodiments, the width is at least 28% of the length.

In some embodiments, an archery bow comprises a frame and a first limb assembly supporting a first rotatable member. The first limb assembly defines a length and comprises a first limb segment and a second limb segment. The first limb segment has a first width and the second limb segment has a second width. The first rotatable member comprises a cam and the bow comprises a power cable in communication with the cam. A second limb assembly supports a second rotatable member. A bowstring extends between the first rotatable member and the second rotatable member. A sum of the first width and the second width equals at least 20% of the length.

In some embodiments, an archery bow comprises a frame and a first limb assembly comprising a first limb segment and a second limb segment. The first limb assembly supports a first rotatable member. The first limb assembly supports a pillow block and the pillow block supports the first rotatable member. The pillow block contacts the first limb segment and the second limb segment.

These and other embodiments which characterize the invention are pointed out with particularity in the claims annexed hereto and forming a part hereof. However, for a better understanding of the invention, its advantages and objectives obtained by its use, reference can be made to the drawings which form a further part hereof and the accompanying descriptive matter, in which there are illustrated and described various embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

A detailed description of the invention is hereafter described with specific reference being made to the drawings.

FIGS. 1-6 show an embodiment of a crossbow.

FIG. 7 shows another embodiment of a crossbow.

FIGS. 8-12 show another embodiment of a crossbow.

FIGS. 13 and 14 show an embodiment of an archery bow.

DETAILED DESCRIPTION OF THE INVENTION

While this invention may be embodied in many different forms, there are described in detail herein specific embodiments of the invention. This description is an exemplification of the principles of the invention and is not intended to limit the invention to the particular embodiments illustrated.

For the purposes of this disclosure, like reference numerals in the figures shall refer to like features unless otherwise indicated.

FIG. 1 shows an embodiment of a crossbow 10. In some embodiments, a crossbow 10 comprises a bow portion 12, a stock 14, a trigger 16 and a string catch.

In some embodiments, the bow portion 12 comprises a prod 20 arranged to support a first limb assembly 40 and a second limb assembly 60. In some embodiments, the prod 20 supports each limb assembly 40, 60 as a cantilever. In some embodiments, the first limb assembly 40 supports a first rotatable member 22. In some embodiments, the second limb assembly 60 supports a second rotatable member 24.

In some embodiments, the prod 20 supports a limb cup 21, and the limb cup 21 supports a limb assembly 40. In some embodiments, a limb cup 21 comprises features as disclosed in US 2017/0138691, the entire content of which is hereby incorporated herein by reference.

In some embodiments, the bow portion 12 comprises a bowstring 17, a first power cable 26 and a second power cable 28. In some embodiments, the rotatable members 22, 24 and cabling arrangement comprise features as disclosed in US 2016/014656, the entire content of which is hereby incorporated herein by reference. In some embodiments, the bow portion 12 comprises a two cam bow. In some embodiments, the bow portion 12 can be a single cam bow, a cam-and-a-half bow, etc.

In some embodiments, a limb assembly 40, 60 comprises a single limb member (not illustrated), and a single limb member supports a rotatable member 22, 24. In some embodiments, a single limb comprises a forked end having a slot, and a rotatable member 22 is positioned in the slot.

In some embodiments, the first limb assembly 40 supports a first axle 23, and the first axle 23 supports the first rotatable member 22. In some embodiments, the second limb assembly 60 supports a second axle 25, and the second axle 25 supports the second rotatable member 24. In some embodiments, a limb assembly 40 supports one or more pillow blocks 30, and the pillow blocks 30 support an axle 23.

In some embodiments, a limb assembly 40, 60 comprises a plurality of limb segments. In FIG. 1, the first limb assembly 40 comprises a first limb segment 41 and a second limb segment 42, and the second limb assembly 60 comprises a first limb segment 41 and a second limb segment 42. In some embodiments, the limb segments 41, 42 forming a limb assembly 40 collectively support a rotatable member 22.

In some embodiments, the first limb segments 41, 61 are located to a first side of an associated rotatable member 22, 24, and the second limb segments 42, 62 are located to a second or opposite side of the rotatable members 22, 24. In some embodiments, a bow portion 12 defines a shooting axis and/or the bowstring 17 defines a bowstring plane of travel. In some embodiments, the rotatable members 22, 24 are oriented in the bowstring plane of travel. In some embodiments, the first limb segments 41, 61 and the second limb segments 42, 62 are located on opposite sides of the bowstring plane of travel.

In some embodiments, a limb comprises at least 2 inches of width for each 10 inches of length. In some embodiments, a limb assembly 40 comprises at least 2 inches of width for each 10 inches of length.

In some embodiments, a limb comprises a width that is at least ⅕ of its length. In some embodiments, a limb assembly 40 comprises a width that is at least ⅕ of its length.

Limbs and limb assemblies having a high width to length ratio provide a greater amount of surface area on the tension surface and/or the compression surface than is provided by prior art limbs. The greater surface area allows for a reduced stress level and greater longevity.

FIG. 2 shows a front view of an embodiment of a crossbow 10. FIG. 3 shows a side view, and FIG. 4 shows a top view of the crossbow 10 embodiment of FIG. 2. FIGS. 5 and 6 show angled front views of the crossbow 10 embodiment of FIG. 2. In FIGS. 4 and 5, a limb cup 21 is shown as transparent to better illustrate the limbs. In FIG. 6, the limb cup 21 is omitted.

Referring to FIGS. 1-6, in some embodiments, a limb assembly 40 comprises a plurality of limb segments 41, 42. In some embodiments, a first limb segment 41 is spaced apart from a second limb segment 42 by a gap 38.

In some embodiments, a limb assembly 40, 60 comprises a first outer side surface 56 and a second outer side surface 58. An overall width 70 of the limb assembly 40 comprises a distance from the first outer side surface 56 to the second outer side surface 58. The overall width 70 measurement can include structural limb segments 41, 42 and any gaps 38. Desirably, width dimensions are measured laterally across the limb, for example orthogonal to a longitudinal axis of the limb. In some embodiments, a width dimension is measured parallel to a rotation axis of the rotatable member 22 supported by the limb assembly 40.

In some embodiments, the first outer side surface 56 of a limb assembly 40 is parallel to the second outer side surface 58. In some embodiments, the first outer side surface 56 and second outer side surface 58 are nonparallel. In some embodiments, the overall width 70 of a limb assembly 40 can be considered the greatest width dimension of the limb assembly 40.

In some embodiments, a limb assembly 40 comprises a first end 57 and a second end 59. A length of the limb assembly 40 can be measured from the first end 57 to the second end 59, for example along a longitudinal axis of the limb assembly 40. In some embodiments, the length can be measured when the limb in an unstressed or unflexed condition. In some embodiments, the length of a limb assembly 40 can be considered the greatest length dimension of the limb assembly 40.

In some embodiments, an overall width 70 of a limb assembly 40, 60 is at least 25% of the length of the limb assembly 40, 60. In some embodiments, an overall width 70 of a limb assembly 40, 60 is at least 26% of the length of the limb assembly 40, 60. In some embodiments, an overall width 70 of a limb assembly 40, 60 is at least 27% of the length of the limb assembly 40, 60. In some embodiments, an overall width 70 of a limb assembly 40, 60 is at least 28% of the length of the limb assembly 40, 60. In some embodiments, an overall width 70 of a limb assembly 40, 60 is at least 29% of the length of the limb assembly 40, 60. In some embodiments, an overall width 70 of a limb assembly 40, 60 is at least 30% of the length of the limb assembly 40, 60.

In some embodiments, a limb assembly 40 comprises a plurality of limb segments e.g. 41, 42. In some embodiments, a limb segment 41 comprises a tension surface 50, a compression surface 52, a first side surface 51 and a second side surface 53. In some embodiments, a limb segment 41 comprises a first end 54 and a second end 55.

In some embodiments, the first side surface 51 of a limb segment 41 is parallel to the second side surface 53. In some embodiments, a second side surface 53 of one limb segment 41 is parallel to an adjacent first side surface 51 of another limb segment 42. In some embodiments, each side surface 51, 53 of each limb segment 41, 42 in a limb assembly 40 is parallel.

In some embodiments, each limb segment 41, 42 of a limb assembly 40 has the same length dimension. In some embodiments, each limb segment 41, 42 of a limb assembly 40 has the same width dimension.

In some embodiments, the limb segments 41, 42 forming a limb assembly 40 have different widths. In some embodiments, the limb segments 41, 42 forming a limb assembly 40 have different lengths.

In some embodiments, the width 72 of a limb segment 41 is at least 10% of the length of the limb segment 41.

In some embodiments, the tension side 50 surface area of a limb segment 41 comprises at least as many square units as the limb segment 41 comprises units of length. For example, if the limb segment 41 has a length of ten inches, the tension side 50 surface area of the segment is ten square inches or more.

In some embodiments, a collective sum of all of the width dimensions 72 of the plurality of limb segments 41 in a limb assembly 40 represents a total structural width of the limb assembly 40. In some embodiment, the collective sum of all of the width dimensions 72 of the plurality of limb segments 41 in a limb assembly 40 equals at least 20% of the length of the limb assembly 40. For example, if the limb assembly 40 has a length of ten inches, the collective sum of width dimensions of the limb segments 41 comprising the limb assembly 40 is at least two inches.

In some embodiments, a collective sum of all of the tension side 50 surface areas of the plurality of limb segments 41 in a limb assembly 40 represents a total tension side 50 surface area of the limb assembly 40. In some embodiment, the total tension side 50 surface area of the limb assembly 40 equals at least 20% of the length of the limb assembly 40. For example, if the limb assembly 40 has a length of ten inches, the total tension side 50 surface area of the limb assembly 40 is twenty square inches or more.

FIG. 4 shows a top view of a crossbow 10 embodiment. In some embodiments, a limb assembly 40 is supported by the prod 20 as a cantilever. In some embodiments, support for the limb assembly 40 is provided as a force couple comprising a tension side support force 80 and a compression side support force 82. In some embodiments, the tension side support force 80 and the compression side support force 82 are provided by a limb cup 21. In some embodiments, the limb assembly 40 supports the rotatable member 22, and the limb assembly 40 is subject to a loading force 84.

Although the actual support forces 80, 82 and loading forces 84 are typically applied as distributed loads, the Figures show equivalent point loading vectors for simplicity, as is common for engineering calculations.

In some embodiment, the collective sum of all of the width dimensions 72 of the plurality of limb segments 41 in a limb assembly 40 equals at least 18% of a distance between the tension side support force 80 and the loading force 84. In some embodiment, the collective sum of all of the width dimensions 72 of the plurality of limb segments 41 in a limb assembly 40 equals at least 19% of a distance between the tension side support force 80 and the loading force 84. In some embodiment, the collective sum of all of the width dimensions 72 of the plurality of limb segments 41 in a limb assembly 40 equals at least 20% of a distance between the tension side support force 80 and the loading force 84.

FIG. 7 shows another embodiment of a bow portion 12 having a wide limb ratio. In some embodiments, a limb assembly 40 comprises any suitable number of limb segments 41. The crossbow 10 of FIG. 7 comprises eight limb segments 41, wherein each limb assembly 40, 60 comprises four limb segments 41.

In some embodiments, a limb assembly 40 comprises a first limb segment 41a and a second limb segment 41b located to a first side of a rotatable member 22. In some embodiments, the limb segments 41a, 41b located to a common side of a rotatable member 22 are separated by a gap 38b. In some embodiments, a limb assembly 40 comprises a first limb segment 42a and a second limb segment 42b located to a second side of a rotatable member 22. In some embodiments, the limb segments 42a, 42b located to a common side of a rotatable member 22 are separated by a gap 38c.

In some embodiments, a collective sum of all of the width dimensions 72 of the plurality of limb segments 41a, 41b, 42a, 42b in a limb assembly 40 equals at least 20% of the length of the limb assembly 40.

In some embodiments, a collective sum of all of the tension side 50 surface areas of the plurality of limb segments 41a, 41b, 42a, 42b in a limb assembly 40 equals at least 20% of the length of the limb assembly 40.

In some embodiments, a pillow block 30 contacts multiple limb segments 41a, 41b. In some embodiments, a pillow block 30 is attached to multiple limb segments 41a, 41b, for example comprising a first fastener 66 engaging a first limb segment 41a and a second fastener 68 engaging a second limb segment 41b.

In some embodiments, a first pillow block 30 engages a first plurality of limb segments 41a, 41b of a limb assembly 40, and a second pillow block 32 engages a second plurality of limb segments 42a, 42b of the limb assembly 40. In some embodiments, the first pillow block 30 is located to a first side of the rotatable member 22, and the second pillow block 32 is located to a second side of the rotatable member 22.

FIG. 8 shows another embodiment of a crossbow 10. In some embodiments, a crossbow 10 comprises a limb segment locator pin 46 in contact with at least one limb segment 41a. In some embodiments, a locator pin 46 in contacts multiple limb segments 41a, 41b.

In some embodiments, a limb segment 41a, 41b comprises a recess 48 for receiving a locator pin 46.

FIGS. 9-12 show additional views of the crossbow 10 of FIG. 8. In some embodiments, a crossbow 10 comprises a limb support pad 34. In some embodiments, the limb support pad 34 provides a compression side support force to a limb segment 41a. In some embodiments, a limb support pad 34 provides a compression side support force to a plurality of limb segments 41a, 41b.

FIGS. 13 and 14 show an embodiment of an archery bow 11. In some embodiments, a bow 11 comprises a riser 15 arranged to support a first limb assembly 40 and a second limb assembly 60. In some embodiments, the riser 15 comprises a grip 19. In some embodiments, the riser 15 supports a limb cup 21, and the limb cup 21 supports a limb assembly 40.

The limb assemblies 40, 60 shown in FIGS. 13 and 14 can have the same features and sizing configurations as disclosed with respect to the embodiments shown in FIGS. 1-12. Like reference characters in the drawings indicate like features.

The limb width-to-length ratios described herein provide a wider limb structure for a given limb length than prior bows. The use of a wider limb allows the limb to be reduced in thickness while maintaining a similar total cross-sectional area. The reduced thickness increases stress levels located near the inner and outer surfaces (e.g. locations of highest respective compressive and tensile forces), while reducing the amount of material under low stress near the neutral axis of the limb. The wide limb ratio provides for greater efficiency by supporting a similar load using a limb that weighs less.

In some embodiments, an archery bow comprises:

• • a frame;
  • a first limb assembly supporting a first rotatable member, the first limb assembly comprising a length dimension, the first limb assembly comprising a plurality of limb segments, each limb segment having a width dimension;
  • the first rotatable member comprising a cam;
  • a second limb assembly supporting a second rotatable member;
  • a bowstring extending between the first rotatable member and the second rotatable member;
  • a power cable in communication with the cam;
  • wherein a sum of the width dimensions of the plurality of limb segments equals at least 20% of the length.

The above disclosure is intended to be illustrative and not exhaustive. This description will suggest many variations and alternatives to one of ordinary skill in this field of art. All these alternatives and variations are intended to be included within the scope of the claims where the term “comprising” means “including, but not limited to.” Those familiar with the art may recognize other equivalents to the specific embodiments described herein which equivalents are also intended to be encompassed by the claims.

Further, the particular features presented in the dependent claims can be combined with each other in other manners within the scope of the invention such that the invention should be recognized as also specifically directed to other embodiments having any other possible combination of the features of the dependent claims. For instance, for purposes of claim publication, any dependent claim which follows should be taken as alternatively written in a multiple dependent form from all prior claims which possess all antecedents referenced in such dependent claim if such multiple dependent format is an accepted format within the jurisdiction (e.g. each claim depending directly from claim 1 should be alternatively taken as depending from all previous claims). In jurisdictions where multiple dependent claim formats are restricted, the following dependent claims should each be also taken as alternatively written in each singly dependent claim format which creates a dependency from a prior antecedent-possessing claim other than the specific claim listed in such dependent claim below.

This completes the description of the preferred and alternate embodiments of the invention. Those skilled in the art may recognize other equivalents to the specific embodiment described herein which equivalents are intended to be encompassed by the claims attached hereto.

Claims

1. A crossbow comprising: a prod, a stock, a string catch and a trigger;a first limb assembly supporting a first rotatable member, the first limb assembly comprising a first outer side and a second outer side, the first rotatable member comprising a cam;a second limb assembly supporting a second rotatable member;a bowstring extending between the first rotatable member and the second rotatable member; anda power cable in communication with the cam;the first limb assembly having a width and a length, the width measured from the first outer side to the second outer side, wherein the width is at least 26% of the length.

2. The crossbow of claim 1, wherein the width is at least 28% of the length.

3. The crossbow of claim 1, wherein the width is measured in a direction parallel to a rotation axis of the first rotatable member.

4. The crossbow of claim 1, the first limb assembly comprising a first limb segment and a second limb segment.

5. The crossbow of claim 4, the first limb segment comprising a width and a length, wherein the width is at least 20% of the length.

6. The crossbow of claim 4, wherein said first limb assembly supports a pillow block, said pillow block supports said first rotatable member, said pillow block contacting said first limb segment and said second limb segment.

7. The crossbow of claim 6, further comprising a limb pad arranged to support said first limb assembly, said limb pad contacting said first limb segment and said second limb segment.

8. The crossbow of claim 7, the limb pad comprising a locator pin, the locator pin contacting the first limb segment and the second limb segment.

9. The crossbow of claim 8, the first limb segment comprising a recess, a portion of the locator pin oriented in the recess.

10. The crossbow of claim 9, the second limb segment comprising a recess, a portion of the locator pin oriented in the recess.

11. The crossbow of claim 6, said first limb assembly comprising a third limb segment and a fourth limb segment, said first limb assembly supporting a second pillow block, said second pillow block supporting said first rotatable member, said second pillow block contacting said third limb segment and said fourth limb segment.

12. The crossbow of claim 11, the first limb segment and the second limb segment located to a first side of the first rotatable member, the third limb segment and the fourth limb segment located to a second side of the first rotatable member.

13. The crossbow of claim 11, comprising a second limb assembly supporting a second rotatable member, the second limb assembly comprising a fifth limb segment and a sixth limb segment.

14. The crossbow of claim 13, the second limb assembly comprising a seventh limb segment and an eighth limb segment.

15. The crossbow of claim 4, the first limb segment spaced apart from the second limb segment by a gap.

16. The crossbow of claim 1, wherein the width is at least 27% of the length.

17. The crossbow of claim 1, wherein the width is at least 29% of the length.

18. The crossbow of claim 1, wherein the width is at least 30% of the length.