# Patent

## Title
Vibrations absorbing stirrup for crossbow and method of manufacturing thereof

## Abstract

A vibration dampening crossbow comprising a stirrup disposed on the distal end of the body, the stirrup including a foot-receiving portion for securing the distal and of the body to the ground with a foot applying pressure on the stirrup toward the ground when cocking the string of the crossbow, wherein the foot-receiving portion of the stirrup is configured to damp vibrations.

## Background
CROSS-REFERENCES
The present application is a non-provisional application of, and claims priority under 35 U.S.C. 119(e) to, U.S. provisional patent application No. 61/904,052 filed Nov. 14, 2013, entitled STIRRUP FOR CROSSBOW AND METHOD OF MANUFACTURING THEREOF, filed under 35 U.S.C. 111(b), which is incorporated herein by reference in its entirety.


BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention generally relates to crossbow improvements. The present invention more specifically relates to a foot-saver security stirrup used to support the crossbow and cocking a string of a crossbow to arm the crossbow. The present invention also more specifically relates to other features adapted to complement the stirrup portion of the crossbow.
2. Description of the Related Art
Crossbows are known since a long time as, originally, a war tool and, later, an alternative to guns for hunting and recreation shooting. Crossbows are designed to pretense the string thereof and install an arrow in a position ready to shoot. The crossbow configuration locates a stirrup at a longitudinal distal end thereof, where the arrow is propelled by the string. The crossbow is generally heading down resting on its stirrup in contact with the ground to receive a foot therein to firmly maintain the crossbow to the ground in opposition to the tension required to proximally pull, generally by hand power or by a manual mechanism, the string and lock the string in a position adapted to longitudinally propel the arrow when the tension in the string is released.
One understands the location of the stirrup locate a foot of a user of the crossbow in a position that is interfering with the movement of the arrow when the arrow is installed on the crossbow and propelled by releasing the tension in the string when uncocking.
This can happen when removing the tension in the string and forgetting the arrow in position on the crossbow. Forgetting the arrow on the crossbow can easily happen because the usual beginning and ending of a hunting period happens in the dark before sunrise and after sunset and the user might not visually see the arrow.
Should the arrow be propelled with an interfering foot in the stirrup happen, the arrow is likely to hit the foot and plant in the ground and keep the person with the arrow across his/her foot secured to the ground with the crossbow.
The stirrup of the crossbow is sized and designed to accommodate a single foot therein. Using only one foot to stabilize the crossbow is not optimal to maintain the crossbow in a stable position thus raising additional safety issues especially with pulling the sting to apply tension in the string when arming/cocking the crossbow.
The stirrup is narrow and does not provide significant angular support to the crossbow when the stirrup is on the ground to apply tension in the string.
The arrow installed on the crossbow in a position ready to be fired is not protected and the user of the crossbow cannot prevent foreign object to contact the arrow and risk to move the arrow from its optimal operating position. Conversely, debris can get stuck between the arrow and the riser and move the arrow out of place. This can happen when the user of the crossbow evolves in low visibility or in daylight in the bush and especially when the user of the crossbow is wearing the crossbow on its back while circulating in the forest or climbing in a tree stand.
It is therefore desirable to provide an improved crossbow structure over the existing art that prevents an interference between the broadhead of the arrow and the foot of a user.
It is also desirable to provide an improved stirrup structure over the existing art that prevents an interference between the broadhead of the arrow and the foot of a user.
It is equally desirable to provide an improved stirrup structure over the existing art that prevents an interference between the broadhead of the arrow and the foot of a user that could be retrofitted on an existing crossbow.
It is also desirable to provide an improved stirrup structure over the existing art that prevents an interference between the broadhead of the arrow and the foot of a user that could reuse the stirrup of the crossbow and be retrofitted on the existing crossbow with an intervening part that relocate the stirrup not located to result in an interference between the arrow's axis and the foot in the stirrup.
Other deficiencies will become apparent to one skilled in the art to which the invention pertains in view of the following summary and detailed description with its appended figures.
SUMMARY OF THE INVENTION
One aspect of the present invention is to alleviate one or more of the shortcomings of the background art by addressing one or more of the existing needs in the art.
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the invention. It is not intended to identify key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concepts of the invention in a simplified form as a prelude to the more detailed description that is presented later.
The invention is generally described as a device adapted to safely allow cocking a string of a crossbow and other improvements thereof.
Aspects of our work provide a stirrup configured to locate the foot of a user therein away from a trajectory of an arrow installed on the crossbow when cocking/uncocking the string of the crossbow and when the crossbow is ready to propel the arrow.
Aspects of our work provide a crossbow equipped with a stirrup configured to locate the foot of a user therein away from the trajectory of an arrow installed on the crossbow when cocking/uncocking the string of the crossbow and when the crossbow is ready to propel the arrow.
Aspects of our work provide a stirrup support configured to locate the foot of a user that is located in the stirrup away from the trajectory of an arrow installed on the crossbow when cocking/uncocking the string of the crossbow and when the crossbow is ready to propel the arrow.
Aspects of our work provide a kit comprising a stirrup configured to be installed on a crossbow and adapted to position the foot of a user that is located in the stirrup away from the trajectory of an arrow installed on the crossbow when cocking/uncocking the string of the crossbow and when the crossbow is ready to propel the arrow.
Aspects of our work provide a stirrup for a crossbow, the stirrup comprising a stirrup adapted to be secured to a distal end of a crossbow, the stirrup including a frame and a foot-receiving portion thereof, the frame being located down from a longitudinal axis of the crossbow to locate a foot on the foot-receiving portion away from the longitudinal axis to prevent an interference between the foot and an arrow propelled by the crossbow along the longitudinal axis.
Aspects of our work provide a stirrup adapted to receive therein one foot or two feet therein.
Aspects of our work provide a “T” shaped stirrup.
Aspects of our work provide a stirrup sized and configured to minimize the height of cocking and improves the ergonomics of the position of a user thereof.
Aspects of our work provide a foot stopper configured to limit how deep a foot can go inside the stirrup. The foot stopper can alternatively be connected or build in the stirrup, the stirrup support and the distal portion of the crossbow.
Aspects of our work provide an adjustable stirrup adapted to change a length between the stirrup and the trigger of the crossbow to adjust the crossbow configuration in accordance with users having various heights.
Aspects of our work provide an arrow protector adapted to protect an arrow installed on the crossbow.
Aspects of our work provide an arrow protector adapted to contact the ground and server as a crossbow support when the crossbow is in a cogging position.
Aspects of our work provide a stirrup assembly including a stirrup and an arrow protector collectively providing a triangular ground-contacting support capable of maintaining the crossbow vertically on the ground.
Aspects of our work provide a stirrup adapted to absorb vibrations when the arrow is propelled.
Aspects of our work provide a stirrup including polymer.
Aspects of our work provide a stirrup including vibration absorbing material.
Aspects of our work provide a stirrup including vibration absorbing elements thereon.
Aspects of our work provide a stirrup including viscoelastic damping material.
Aspects of our work provide a stirrup including elastic and viscoelastic damping capable material.
Aspects of our work provide a stirrup providing vibration isolation.
Aspects of our work provide a stirrup including vibration absorbing elements receivers thereon.
Aspects of our work provide a crossbow comprising a body including a longitudinal axis; at least one limb affixed on a distal end of the body, the at least one limb being adapted to move between a distal relaxed position and a proximal tensed position for accumulating energy; a string mounted on respective transversal sides of the at least one limb in a substantially orthogonal direction in respect with the body for tensing the at least one limb when proximally longitudinally pulled away from the distal end and blocking the at least one limb in the tensed position for longitudinally propelling an arrow along the longitudinal axis in a distal direction when selectively released; and a stirrup disposed on the distal end of the body, the stirrup including a foot-receiving portion for securing the distal end of the crossbow to the ground with a foot applying pressure on the stirrup toward the ground, wherein the foot-receiving portion of the stirrup is configured to receive and locate a foot away, down from the longitudinal axis, to prevent an interference between the arrow, propelled along the longitudinal axis, and the foot.
Aspects of our work provide a vibration dampening crossbow comprising a body including a longitudinal axis; a pair of limbs affixed on a distal end of the body, the pair of limbs being adapted to move between a distal relaxed position and a proximal tensed position for accumulating energy thereof; a string mounted on respective transversal sides of the pair of limbs in a substantially orthogonal direction in respect with the body for tensing the pair of limbs when proximally longitudinally pulled away from the distal end and blocking the pair of limbs in the tensed position for longitudinally propelling an arrow along an arrow trajectory in a longitudinal and distal direction when the string is selectively released to bring back the pair of limbs the distal relaxed position; and a stirrup disposed on the distal end of the body, the stirrup including a foot-receiving portion for securing the distal end of the body to the ground with a foot applying pressure on the stirrup toward the ground when cocking the string of the crossbow, wherein the foot-receiving portion of the stirrup is configured to damp vibrations.
Aspects of our work provide a vibration dampening stirrup for a crossbow, the crossobow comprising a body including a longitudinal axis; and a pair of limbs affixed on a distal end of the body, the pair of limbs being adapted to move between a distal relaxed position and a proximal tensed position for accumulating energy thereof; a string mounted on respective transversal sides of the pair of limbs in a substantially orthogonal direction in respect with the body for tensing the pair of limbs when proximally longitudinally pulled away from the distal end and blocking the pair of limbs in the tensed position for longitudinally propelling an arrow along an arrow trajectory in a longitudinal and distal direction when the string is selectively released to bring back the pair of limbs the distal relaxed position, the vibration dampening stirrup being disposed on the distal end of the body, the stirrup comprising a foot-receiving portion for securing the distal end of the body to the ground with a foot applying pressure on the stirrup toward the ground when cocking the string of the crossbow, wherein the foot-receiving portion of the stirrup is configured to damp vibrations.
Each of the embodiments of the present invention has at least one of the above-mentioned objects and/or aspects, but does not necessarily have all of them. It should be understood that some aspects of the present invention that have resulted from attempting to attain the above-mentioned objects may not satisfy these objects and/or may satisfy other objects not specifically recited herein.
Additional and/or alternative features, aspects, and advantages of embodiments of the present invention will become apparent from the following description, the accompanying drawings, and the appended claims.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an illustration of an exemplary crossbow;
FIG. 2 is a schematic illustration of a person cocking a crossbow;
FIG. 3 is a schematic illustration of a left elevational side view of a crossbow;
FIG. 4 is a schematic illustration of a top plan view of a crossbow;
FIG. 5 is a schematic illustration of a crossbow and an interference between a longitudinal axis of the crossbow and a foot of a user cocking the crossbow with a foot in the stirrup;
FIG. 6 is a schematic illustration of a left elevational side view of a crossbow in accordance with an embodiment of the present invention;
FIG. 7 is a schematic illustration of a top plan view of a crossbow in accordance with an embodiment of the present invention;
FIG. 8 is a schematic illustration of a crossbow and a non-interference between a longitudinal axis of the crossbow and a foot of a user cocking the crossbow with a foot in the stirrup in accordance with an embodiment of the present invention;
FIG. 9 is a schematic illustration of a stirrup in accordance with an embodiment of the present invention;
FIG. 10 is a schematic illustration of a stirrup in accordance with an embodiment of the present invention;
FIG. 11 is a schematic illustration of a stirrup with a foot-stopper in accordance with an embodiment of the present invention;
FIG. 12 is a schematic illustration of a stirrup with an arrow protector in accordance with an embodiment of the present invention;
FIG. 13 is a schematic illustration of a stirrup with an adjustable stirrup support in accordance with an embodiment of the present invention;
FIG. 14 is a schematic illustration of a stirrup with an adjustable stirrup support in accordance with an embodiment of the present invention;
FIG. 15 is a schematic illustration of a stirrup with an adjustable stirrup support and a foot stopper in accordance with an embodiment of the present invention;
FIG. 16 is a schematic illustration of a stirrup with an adjustable stirrup support and a foot stopper in accordance with an embodiment of the present invention;
FIG. 17 is a schematic illustration of a stirrup with an adjustable stirrup support and a foot stopper in accordance with an embodiment of the present invention;
FIG. 18 is a schematic illustration of a stirrup with an arrow protector in accordance with an embodiment of the present invention;
FIG. 19 is a schematic illustration of a stirrup with an arrow protector in accordance with an embodiment of the present invention;
FIG. 20 is a schematic illustration of a stirrup with an arrow protector and a foot-stopper in accordance with an embodiment of the present invention;
FIG. 21 is a schematic illustration of a stirrup with an arrow protector adapted to contact the ground in accordance with an embodiment of the present invention;
FIG. 22 is a schematic illustration of an arrow protector adapted to contact the ground in accordance with an embodiment of the present invention;
FIG. 23 is a schematic illustration of a stirrup with an arrow protector and a foot-stopper adapted to contact the ground in accordance with an embodiment of the present invention;
FIG. 24 is a schematic illustration of an arrow protector in accordance with an embodiment of the present invention;
FIG. 25 is a schematic illustration of an arrow protector in accordance with an embodiment of the present invention;
FIG. 26 is a schematic illustration of an arrow protector in accordance with an embodiment of the present invention;
FIG. 27 is a schematic illustration of an arrow protector in accordance with an embodiment of the present invention;
FIG. 28 is a schematic illustration of an arrow protector in accordance with an embodiment of the present invention;
FIG. 29 is a schematic illustration of a top plan view of a crossbow with a stirrup in accordance with an embodiment of the present invention;
FIG. 30 is a schematic illustration of a top plan view of a crossbow with a stirrup in accordance with an embodiment of the present invention;
FIG. 31 is a schematic illustration of a top plan view of a crossbow with a stirrup in accordance with an embodiment of the present invention;
FIG. 32 is an isometric view of an exemplary stirrup in accordance with an embodiment of the present invention;
FIG. 33 is a top plan view of an exemplary stirrup in accordance with an embodiment of the present invention;
FIG. 34 is a front elevational view of an exemplary stirrup in accordance with an embodiment of the present invention;
FIG. 35 is a rear elevational view of an exemplary stirrup in accordance with an embodiment of the present invention;
FIG. 36 is a bottom plan elevational view of an exemplary stirrup in accordance with an embodiment of the present invention;
FIG. 37 is a left elevational view of an exemplary stirrup in accordance with an embodiment of the present invention;
FIG. 38 is a right elevational view of an exemplary stirrup in accordance with an embodiment of the present invention;
FIG. 39 is an isometric view of an exemplary vibration damper in accordance with an embodiment of the present invention;
FIG. 40 is an isometric view of an exemplary stirrup outfitted with several exemplary vibration dampers in accordance with an embodiment of the present invention;
FIG. 41 is a schematic illustration of a mass-ended cantilevered beam in accordance with an embodiment of the present invention;
FIG. 42 is a schematic illustration of a mass-ended cantilevered beam treated as a simple lumped-mass sdof (single degree of freedom) system in accordance with an embodiment of the present invention;
FIG. 43 is a schematic illustration of the conceptual vibration absorber refined to consider the two feet-receiving portions as cantilever vibration absorbers of an exemplary stirrup in accordance with an embodiment of the present invention;
FIG. 44 is a bottom isometric view of a stirrup attached to a crossbow in accordance with an embodiment of the present invention;
FIG. 45 is a left isometric view of a stirrup attached to a crossbow in accordance with an embodiment of the present invention;
FIG. 46 is a right isometric view of a stirrup attached to a crossbow in accordance with an embodiment of the present invention;
FIG. 47 is a top isometric view of an embodiment of the stirrup
FIG. 48 is a right isometric view of an exemplary crossbow outfitted with an embodiment of the stirrup;
FIG. 49 is a bottom left isometric view of an embodiment of a stirrup attached to a crossbow in accordance with an embodiment of the present invention;
FIG. 50 is a top isometric view of an embodiment of a stirrup attached to a crossbow in accordance with an embodiment of the present invention; and
FIG. 51 is a bottom plan view of an embodiment of a stirrup attached to a crossbow in accordance with an embodiment of the present invention.



DESCRIPTION OF EMBODIMENT(S) OF THE INVENTION
Our work is now described with reference to the figures. In the following description, for purposes of explanations, numerous specific details are set forth in order to provide a thorough understanding of the present invention by way of embodiment(s). It may be evident, however, that the present invention may be practiced without these specific details.
A crossbow 10 is illustrated in FIG. 1, the crossbow 10 includes a side proximal 14 to the user and a side distal 18 to the user 90 when the crossbow 10 is held by a user in a shooting position. The crossbow 10 includes a longitudinal axis 22 along which an arrow 26, when properly installed on the crossbow 10 in its flight groove and optionally held by a arrow retention spring 30, is properly located to be propelled by a string 32. The crossbow 10 further comprises a stock 34, a sight bridge 38, a foregrip 42 and a barrel 46. On its distal 18 end, the crossbow 10 has a stirrup 50 disposed thereon. The stirrup 50 includes a frame 54 and a foot-receiving portion 58 disposed therein. The stirrup 50 is configured to help the user 90 of the crossbow to cock the string 32. Generally, the distal 18 end of the crossbow 10 is put on the ground, the user 90 puts a foot on the stirrup 50 and holds the stirrup 50 on the ground with a foot pressure against the tensing string 32. As illustrated, the stirrup 50 is fastened to the distal end 18 of the barrel 46 next to the riser 62 to which are connected a pair of limbs 66 on respective transversal side thereof. The pair of limbs 66 is adapted to be flexed to accumulate energy that is selectively released to propel the arrow 26. The crossbow 10 is further equipped with an optional sight 70 and a latch 74 holds the tensed string 32 that can be selectively released to release the string 32 and propel the arrow 26 upon actuation of the trigger 78 by the user 90.
Turning now to FIG. 2 illustrating a typical cocking by hand of a crossbow 10 by a user 90 using his/her hands 94 to pull the string 32 toward the proximal side 14 of the crossbow 10. Simultaneously, the user 90 is using one foot 98 on the stirrup 50 to apply pressure distally 18 toward the ground 102 to maintain the crossbow 10 on the ground 102 and counterbalance the tension applied proximally 14 to the string 32 to cock the crossbow 10.
FIGS. 3-5 illustrate a schematic prior art crossbow 10 from various directions. The stirrup 50 is adapted to be folded on the crossbow 10 of FIG. 3. One can appreciate from FIG. 5 that the arrow axial trajectory 22 interferes 100 with the foot 98 of the crossbow 10 user. The foot 98 of the user 90 is thus dangerously located in the trajectory of the arrow 26 and serious injury can happen should the arrow 26 be propelled accidentally. The arrow 26 could even secure the foot of the user 90 in the ground 102, locking the foot of the user 90 through the stirrup 50 if the arrow 26 is propelled and passes through the foot 98 of the user 90 through the stirrup 50. As one can imagine, this is not a desirable position, especially in the woods late at night.
In contrast, FIGS. 6-8 illustrate a crossbow 10 equipped with a stirrup 50 having a configuration preventing an interference between the longitudinal axis 22 of the trajectory of the arrow 26 and the foot 98 of a user 90. In the present situation, the stirrup 50 is located at a greater distance d1 from the longitudinal axis 22, as depicted in FIG. 6, to distance the foot 98 from the longitudinal axis 22 by a distance d2 and thus protects the foot 98 of the user against the arrow 26 trajectory 22. In at least one embodiment, the stirrup 50 is located downward of a trigger longitudinal axis 82 to further locate the foot of a user 90 away from the trajectory of the arrow 26.
Embodiments of the stirrup 50 can be sold with a new crossbow 10 or can be sold separately to retrofit an existing crossbow 10 without departing from the scope of the present invention. The stirrup 50 has, preferably, a securing mechanism that is compatible with common securing mechanisms of existing crossbows 10. Securing the stirrup 50 of embodiments is generally using the existing fastening mechanism of crossbows 10 on the market.
The location of the stirrup 50 in embodiments of the present application is offset from the longitudinal axis 22 of the arrow and hence away from the barrel 46 and the limbs 66 as depicted in FIG. 8. The offset location of the stirrup 50 gives more proximal space to the foot 98, or the feet 98, of the user 90. The arrangement of the stirrup 50 with the crossbow 10 can be longitudinally more compact because there is more room to locate the stirrup 50 closer to crossbow 10. The longitudinal length of the stirrup 50 and crossbow 10 assembly can hence be shorter. The shorter crossbow length is advantageous, inter alia, because it is lowering the displacement of the string 32 when cocking the string 32. A lower displacement is more ergonomic, especially for shorter users 90, because the elbows of the user 90 have to raise less high when cocking the string 32 and less strength is required. The position of the stirrup 50 of embodiments can optionally be adjustable and allows setting a desired longitudinal distance 86 between the stirrup 50 and the latch 74 to adapt to users of different sizes and heights. This adjustable stirrup 50 is illustrated in FIG. 10 and FIG. 12 throughout FIG. 17.
A magnified portion of the stirrup 50 in accordance with embodiments of the invention is illustrated in FIG. 9 throughout FIG. 12. In FIG. 9, the stirrup 50 includes a first stirrup member 106, parallel with the longitudinal axis of the crossbow 10, in addition to a second stirrup member 108, connected at an angle with the first stirrup member 106, embodied in a one-part 114 configuration. The stirrup 50 is optionally pivotably secured about pivot 110 on the distal end of the crossbow 10. One can appreciate the pivotal movement 118 of the stirrup 50, 106 is limited to prevent locating the stirrup 50, 106 close to the longitudinal axis 22 of the crossbow 10. The pivotal movement 118 of the stirrup 50 on the opposite side can be sufficient to store the stirrup 50, 106 close to the foregrip 42. A locking mechanism (not illustrated) is optionally used to keep the pivotable stirrup 50, 106 in the desired position.
Moving now to FIG. 10 where is illustrated a stirrup 50 interconnected to the distal end of the crossbow 10 via the stirrup connector 122 with a securing mechanism 126. The stirrup connector 122 is sized and designed to locate the stirrup 50 at a distance 130 from the longitudinal axis 22 of the crossbow 10. The stirrup connector 122 can be sold as a retrofit part to distance and locate an OEM stirrup 50 in a desirable position thereof. The stirrup connector 122 is also optionally designed to have an adjustable length 132, between a minimum length and a maximum length, to fit a range of morphology, size of boots and user's 90 preferences. The present embodiment uses a set of spacers 134 to define the length of the stirrup connector 122 however other adjustment mechanisms are likely to become obvious to a skilled reader and remain within the scope of this application.
FIG. 11 depicts the one-part 114 stirrup 50 of FIG. 9 with an additional foot stopper 138 adapted to limit the position of the foot 98, or feet 98, in the stirrup 50 to prevent extending beyond the longitudinal axis 22. The configuration using a stirrup 50 with the foot stopper 138 is illustrated with a design where the stirrup 50 is assembled with the foot stopper 138. The longitudinal length of the first stirrup member 106 can be made with the adjustable mechanism illustrated in FIG. 12 using a series of holes 132 used in conjunction with fasteners for securing mechanism 126, however other adjustment mechanisms are likely to become obvious to a skilled reader and remain within the scope of the application.
Turning now to FIG. 13 illustrating an embodiment where the stirrup 50 is adjustably secured to the crossbow 10, more precisely to the foregrip 42 of the crossbow 10 in the illustrated embodiment, via a stirrup receiver 140. The stirrup receiver 140 comprises an axial adjustment mechanism 144, embodied with a slot 148 in FIG. 13, allowing longitudinally positioning 132 of the stirrup 50 and thus modifies the length of the crossbow 10. As previously mentioned, the length of the crossbow 10 can be adapted to match different sizes of users 90 and allowing users 90 of various height to optimally cock the crossbow 10 when pulling the string 32 to more easily engage the latch 74. The slot 148 offers a variety of longitudinal positions at which can be secured the stirrup 50 with a fastener 152. The stirrup 50 can alternatively be pivotable in respect to the foregrip 42 of the crossbow 10 for storage or for reducing the length of the crossbow 10 for some other specific purposes like using the stirrup 50 as a support when shooting with the crossbow 10. The stirrup receiver 140 can alternatively offer selective positions along a predetermined length as illustrated in FIG. 14. The stirrup receiver 140 of FIG. 14 includes a series of discrete locations 156 to which the stirrup receiver 140 can be removably secured. The illustrated configuration in FIG. 14 results in the longest distance between the stirrup 50 and the crossbow 10, which is intended for tall users 90. Other adjustment mechanisms remain within the scope of this application
A foot stopper 138 is added to the illustrated embodiment in FIG. 15. This time the foot stopper 138 is connected to the foregrip 42 of the crossbow 10 and is thus not going to longitudinally move with the stirrup 50. The stirrup 50 of FIG. 15 is assembled with a stirrup connector 122 to allow further adjustments thereof. In the present situation, the adjustment is discretely provided with, for example, a series of pairs of holes 160 used in conjunction with securing fasteners. Conversely, the pairs of holes 160 could alternatively be replaced with a slot 164 to provide further adjustment capabilities as illustrated in FIG. 16. A securing mechanism 168 is used to secure/fasten the first stirrup member 106 to the stirrup connector 122. One would note that the foot stopper 138 of the embodiment of FIG. 16 is connected to the stirrup receiver 140. The foot stopper 138 could be adjustably secured to a foot stopper connector 172 extending from the stirrup receiver 140 disposed on the distal end of the crossbow 10 to locate the foot stopper 138 closer, or farther, from the longitudinal axis 22 of the crossbow 10. The foot stopper 138 can alternatively be discretely secured with holes, or the like, disposed in the foot stopper connector 172. The embodiment illustrated in FIG. 17 teaches the foot stopper 138 can be secured to the stirrup 50 and be movable with the stirrup 50. All the adjustment mechanisms illustrated in FIG. 10 to FIG. 17 are preferably adapted to reduce or prevent any undesired rotations or relative movements of the parts to ensure a constant geometrical arrangement of the stirrup assembly 176.
An optional arrow protector 142, illustrated in FIG. 18, is adapted to protect the broadhead 28 of the arrow 26 against foreign objects to prevent undesirable movement of the arrow 26 and to keep the arrow 26 in line with the longitudinal axis 22. The arrow protector 142 is also helpful to prevent injuries by contacting the sharp portions of the broadhead 28. The arrow protector 142 is secured to the distal end of the crossbow 10 via a support 146, as illustrated in FIG. 18. FIG. 18 throughout FIG. 20 illustrate a stirrup assembly 176 used in conjunction with an arrow protector 142 secured to the crossbow 10 via a support 146. The arrow protector 142 receives therein a portion of the arrow 26 to maintain and secure the arrow 26 (not shown) in place on the crossbow 10. The broadhead 28, or the shaft of the arrow 26, can optionally be held by the arrow protector 142 in an embodiment. The arrow protector 142 is intended to further protect the user 90 against being injured by contacting a razor-sharp broadhead 28. The arrow protector 142 can be secured directly to the stirrup assembly 176, as illustrated in FIG. 19, and in combination with a foot stopper 138, as depicted in FIG. 20.
The arrow protector 142 can alternatively be secured to the stirrup 50, 106 (or its stirrup connector 122 depending on the configuration) as exemplified in FIG. 19. The arrow protector 142 remains fix when it is connected to the distal end of the crossbow 10 and is pivotable, in its pivotable configuration, when secured to the stirrup 50, 106. The stirrup assembly 176 can alternatively be used in cooperation with the arrow protector 142 as embodied in FIG. 20.
A longer arrow protector 142 can be used to increase the crossbow 10 stability when positioned vertically in contact with the ground 102 for cocking the string 32 of the crossbow 10 or simply for vertically resting the crossbow 10 on the ground. As it is exemplified in FIG. 21 through FIG. 23, various combinations and arrangements of parts are possible. The arrow protector 142 offers an additional point of contact with the ground 102 to increase the stability of the crossbow 10. With the embodied “T” shaped stirrup 50, the arrow protector 142 produces a three-contact-point (or triangular) support on the ground to ensure self-stability, or mechanical equilibrium, of the crossbow 10 resting on its distal end thereof. Preferably, the stirrup assembly 176 and the arrow protector 142 are collectively configurable to ensure they are of a proper length to be usable together.
FIG. 24 throughout FIG. 28 schematically illustrate variants of possible arrow protector 142 shapes 150. The section views depict different shapes, sized and designed to accommodate different types and sizes of arrow heads, and thus ensure optimal positioning of the arrow 26 in addition to protect the sharp tip broadhead 28 of the arrow 26. An opening 180 in the arrow protector 142 can be provided to pass the arrow 26, preferably the shaft of the arrow 26, through the arrow protector 142 as opposed to require slipping broadhead 28 of the arrow 26 longitudinally through the arrow protector 142. Simply passing the arrow shaft through the opening 180 in the arrow protector 142 is a more natural movement for the user 90.
In turn, FIG. 29 throughout FIG. 31 illustrate stirrups 50, 106 adapted to accommodate one foot 98 or two feet 98 therein using different arrangements of parts. The embodiment exemplified in FIG. 29 illustrates a pair of opened foot-receiving portions 58. FIG. 30 illustrates an embodiment where one foot 98 or two feet 98 can be inserted in the foot-receiving portion 58. The foot-receiving portion 58 of FIG. 30 is separated in the embodiment of FIG. 31 to ensure a more precise position of both feet 98 in the stirrup assembly 176. Those arrangements configured to accommodate two feet 98 have the benefit, inter alia, to provide additional stability to the crossbow 10. The two feet 98 are in a position to exercise an equal pressure on both sides of the longitudinal axis 22 via the stirrup assembly 176. The crossbow 10 is thus firmly maintained on the ground and into a stable and balanced position. Another benefit is to make it possible for user to cock the crossbow 10 in a seated posture.
The previous Figures have been illustrating embodiments in a rather conceptual fashion. FIG. 32 throughout FIG. 38 are illustrating a more refined embodiment of the stirrup 50. The embodied stirrup 50 of FIG. 32 is made in a one-piece configuration with injected polymer material. The polymer material offers several advantages, namely in terms of lightweight, low price for mass production of the stirrup 50 and also as a vibration dampening element. Alternatively, other materials like aluminum could be used to manufacture the stirrup 50. The stirrup 50 illustrated in FIG. 32 includes two open foot-receiving portions 190 disposed on lateral sides of the longitudinal axis 22 locating the feet 98 of a user away from the trajectory of the arrow 26. The two foot-receiving portions 190 of the stirrup 50 are equipped with anti-slip features 194 embodied as an array of molded small spikes 198. The foot-receiving portions 190 further include grooved sections 202 adapted to ensure a strong contact between the stirrup 50 and the feet 98 of a user on one side and the ground 102 on the opposite side when the stirrup 50 is in the cocking position. The grooved sections 202 are also extending in the second stirrup member 108 to lighten the stirrup 50 by using material discretely where required for mechanical strength. A series of ribs 204 are interconnected by a junction rib 208 to increase the stiffness of the stirrup 50. A plurality of parallel junction ribs 208.1, 208.2, illustrated in dotted lines, could be embodied to increase the stiffness of the part. Other patterns of ribs 204 and junction ribs 208 could be used to provide the desired stiffness and mechanical strength to the stirrup 50. A pattern of junction ribs in “X” 212 schematically illustrated with dotted lines could be used to add torsion stiffness. One can note that the second stirrup member 108 also includes recessed sections 206 to further lighten the stirrup 50 by using material discretely where required for mechanical strength between the foot-receiving portions 190, the arrow protector 142 and the crossbow 10.
The stirrup 50 includes an optional arrow protector 142 that is covering the broadhead 28 of the arrow 26 hence further protecting the feet 98 of a user 90 from the broadhead 28 of the arrow 26. The stirrup 50 can be embodied with only the foot-receiving portions 190 and, alternatively, with the arrow protector 142. The arrow protector 142 can optionally be a distinct part and be added if desired to the stirrup 50. The longitudinal length of the arrow protector 142 preferably covers the broadhead 28. The position, configuration and length of the arrow protector 142 is providing a third contact point with the ground in addition with the two contact points with the ground offered by the two foot-receiving portions 190. This layout produces a triangular ground-contacting configuration with three contact points providing stability of the crossbow 10 when resting on the ground on its distal side, supported by the stirrup 50 and the arrow protector 142 for cocking the crossbow 10.
The stirrup 50 further includes a crossbow receiving portion 210 adapted for contacting and attaching the stirrup 50 to the distal end of the crossbow 10 with two cooperating angled planes 214, 218 (illustrated orthogonal to each other) ensuring a strong connection with the crossbow 10. The plane 214 can include a reinforcing sleeve 222 providing additional strength to the stirrup when the fastener is secured therethrough. The reinforcing sleeve 222 can be made of aluminum or other materials offering sufficient strength. Fasteners are used to secure the stirrup 50 to the crossbow 10 through a series of holes 226.
Crossbows 10 are generating significant vibrations when releasing the string 32 for propelling an arrow 26. However, a low level of noise is preferable when hunting. The stirrup 50, seen in FIG. 32 throughout FIG. 38, includes a plurality of vibration damper receivers 230. The vibration damper receivers 230 are sized and designed to receive vibration dampers 234 thereon. In a possible embodiment, rubberized elements 238 can be used as vibration dampers and be installed on the stirrup 50. In the present embodiment, the vibration damper receivers 230 are located near the ends of the foot-receiving portions 106 to dissipate vibrations traveling toward the ends of the foot-receiving portions 106 before they transform into audible noise. A third vibration damper receiver 230 is located in the center of the stirrup 50 between the arrow protector 142 and the foot-receiving portions 106, preferably near the end of the arrow protector 142. The vibration dampers are going to be secured within the groove shaped by the vibration damper receivers 230 in the foot-receiving portions 190. The third vibration damper receiver 230 is embodied as a protrusion extending from the arrow protector 142 including concave sections sized and designed to receive therein a vibration damper 234. It remains within the scope of the present application to add, remove and change the configuration, the number and the locations of the vibration damper receivers 230 to adapt to specific factors and designs.
A vibration damper 234 is exemplified in FIG. 39. The vibration damper 234 is preferably made of vibrations dampening material like rubber. The vibration damper 234 is designed with an elongated shape along a longitudinal axis 242. The vibration damper 234 can be embodied in various longitudinal lengths in accordance with its position on the stirrup 50 or on the crossbow 10. A soft rubber having sufficient elasticity is preferable to ensure strong contact and proper positioning on the stirrup 50 or the crossbow 10. The contact with the stirrup 50 or the crossbow 10 needs to be sufficient to prevent any change of location when the vibration damper 234 is subjected to vibrations.
The vibration damper 234 includes a central opening 246 that is sized and designed to fit on the desired vibration damper receivers 230. The central opening 246 is illustrated with a longitudinal shape adapted to match and properly cooperate with the vibration damper receivers 230 of the illustrated embodiment. At least one protruding portion 250 is axially extending on at least one side of the vibration damper 234 to vibrate and dissipate vibration energy with its flexible construction and lower the vibration noise that could be caused by the release of the tension in the string 32 and the propulsion of the arrow 26. The protruding portion 250 is embodied at a distance from the central opening 246 with a spherical shape 254. The protruding portion 250 is connected with the body 258 of the vibration damper 234 by an interconnecting portion 262. The interconnecting portion 262 has a reduced section compared with the body to transmit vibrations to the vibration damper 234. In turn, the vibration damper 234 has a larger size to include more material ensuring efficient vibration absorption. The vibration damper 234 is embodied as a generally spherical shape 254 in the present embodiment however other shapes and sizes are contemplated by the present application.
A series of radiuses 266 are managing soft transitions between the different sides of the vibration damper 234. A radius 270 is included on each longitudinal extremity of the central opening 246 to prevent local stress concentration. External radiuses 274 are disposed between the body 258. Opposed and substantially planar sides 278 are defining the lateral shape of the vibration damper 234. The thickness of the body 258 is adapted to match the thickness of the vibration damper receiver 230 and the elasticity of the vibration damper 234 allows installation of the vibration damper 234 thereon while firmly securing the vibration damper 234 on the desired vibrating portion of the stirrup 50 and/or the crossbow 10.
The combined interaction between the stirrup 50 disposed at a distal 18 end of the crossbow 10 is acting as an energy harvesting structure that can harvest energy from the vibrations caused by the functioning of the crossbow 10. The harvesting of mechanical energy from vibrations is using inertial energy harvesting that generally relies in the resistance of a mass to acceleration, and kinematic energy harvesting which directly couples the energy harvester, the stirrup 50, to the relative movement of the source, the crossbow 10. The polymer stirrup 50 of embodiments therein is mainly provided by the viscoelastic character of polymers. Rubber is also used as vibration damping material due to its viscoelasticity.
The stirrup 50 and crossbow 10 structure can be seen as a spring designs for use in vibration absorbers. In particular, the “mass-ended cantilevered” produced by the foot-receiving portions 190 extending distally in front of the crossbow 10, offers a very simple realization of a spring-mass system for use as a vibration absorber. Such a mass-ended cantilevered beam is illustrated schematically in FIG. 41 where the cantilever stirrup 50 is connected to the crossbow 10. The hence considered mass-ended cantilevered beam may be treated as a simple lumped-mass sdof (single degree of freedom) system as shown in FIG. 42 having a mass M and a spring stiffness K. The conceptual vibration absorber can also be refined to consider the two foot-receiving portions 190 extending distally in front of the crossbow 10 as illustrated in FIG. 43 as cantilever vibration absorber.
The exemplified stirrup 50 is preferably made of polymer material that can be charged with reinforcement fibers therein to further increase its mechanical strength due to the significant mechanical load applied on the stirrup 50 when cocking the crossbow 10.
FIG. 44 throughout FIG. 51 are illustrating embodiments described above from various perspectives.
The description and the drawings that are presented above are meant to be illustrative of the present invention. They are not meant to be limiting of the scope of the present invention. Modifications to the embodiments described may be made without departing from the present invention, the scope of which is defined by the following claims:

## Claims

1. A vibration damping crossbow comprising:
a body including a longitudinal axis;
a single pair of oppositely extending limbs affixed on a distal end of the body, the pair of limbs being adapted to move between a distal position and a proximal position for accumulating energy;
a single string mounted on respective sides of the single pair of limbs in a substantially transversal direction with respect to the body for tensing the pair of limbs when proximally longitudinally pulled away from the distal end of the body, for blocking the pair of limbs in the position, and for longitudinally propelling an arrow along an arrow trajectory in a longitudinal and distal direction when the string is released to return the pair of limbs to the distal position; and
a vibration damping stirrup disposed on the distal end of the body, distally from the pair of limbs, the stirrup including a crossbow receiving portion including at least two cooperating angled planes contacting the body, one plane being normal to the longitudinal axis, a support longitudinally extending in cantilever distally from the at least two cooperating angled planes, and a pair of foot-receiving portions fixedly connected, in cantilever, to a distal end of the support, distally from the single pair of limbs and respectively located on opposed sides of the arrow trajectory, down from the body, for securing the distal end of the body to the ground with at least a foot applying pressure on the stirrup toward the ground when cocking the string of the crossbow, the foot-receiving portions including a plurality of juxtaposed grooved sections along the foot-receiving portions;
wherein the pair of cantilevered foot-receiving portions of the stirrup damps vibrations created by the return of the pair of limbs from the proximal position to the distal position, the vibrations being transmitted through the body, distally transmitted through the cantilevered support and orthogonally transmitted in the pair of cantilevered foot-receiving portions, at least partially through the plurality of juxtaposed grooved sections, toward distal ends of the cantilevered foot-receiving portions;
wherein the foot-receiving portions include a vibration absorber receiver; and
wherein a vibration absorber is secured to the vibration absorber receiver to further absorb vibrations.

2. The vibration damping crossbow of claim 1, wherein the pair of cantilevered foot-receiving portions is offset down from the body.

3. The vibration damping crossbow of claim 1, wherein the cantilevered foot-receiving portions are separated by the support extending between them.

4. The vibration damping crossbow of claim 1, wherein the pair of cantilevered foot-receiving portion comprises a lumped-mass system for damping vibrations when the string is released to propel the arrow.

5. The vibration damping crossbow of claim 1, wherein the stirrup is located below a longitudinal trigger axis that is axially projected from a trigger latch of the crossbow.

6. The vibration damping crossbow of claim 1, wherein the stirrup comprises a polymer including fibers therein to further reinforce the stirrup.

7. The vibration damping crossbow of claim 1, wherein each vibration absorber comprises rubber.

8. The vibration damping crossbow of claim 1, wherein each vibration absorber comprises a mass-ended cantilever portion.

9. A crossbow comprising:
a body including a longitudinal axis;
a pair of limbs affixed to the body, with a first limb of the pair extending on a first side of the body, and a second limb of the pair extending on a second side of the body opposite to the first side, the pair of limbs being adapted to transition from a distal configuration to a proximal configuration for accumulating energy, and return to the distal configuration from the proximal configuration for releasing energy;
a string extending across the body between and mounted on the limbs by which string an arrow is longitudinally propelled along an arrow trajectory when the pair of limbs returns to the distal configuration from the proximal configuration; and
a stirrup located at a distal end of the body, the stirrup comprising a support longitudinally extending distally from the body to a pair of foot-receiving portions connected to a distal end of the support, with a first foot-receiving portion of the pair extending from the distal end of the support to a distal end thereof on the first side of the body, and a second foot-receiving portion of the pair extending from the distal end of the support to a distal end thereof on the second side of the body;
wherein each foot-receiving portion at the distal end thereof includes a grove containing a vibration absorber secured therein for dissipating vibrations thereat.

10. A vibration damping stirrup adapted to be secured to a distal end of a body of a crossbow, the crossbow comprising a single pair of oppositely extending limbs affixed on the distal end of the body, the pair of limbs being adapted to move between a distal position and a proximal position for accumulating energy, and a single string mounted on respective transversal sides of the single pair of limbs in a substantially transversal direction with respect to the body for tensing the pair of limbs when proximally longitudinally pulled away from the distal end, for blocking the pair of limbs in the position, and for longitudinally propelling an arrow along an arrow trajectory in a longitudinal and distal direction when the string is released to return the pair of limbs to the distal position, the vibration damping stirrup comprising:
a crossbow receiving portion including at least two cooperating angled planes contacting the body, one plane being normal to a longitudinal axis of the body,
a support longitudinally extending in cantilever distally from the at least two cooperating angled planes, and
a pair of foot-receiving portions fixedly connected, in cantilever to a distal end of the support, distally from the single pair of limbs and respectively located on opposed transversal sides of the arrow trajectory, down from body, for securing the distal end of the body to the ground with at least a foot applying pressure on the stirrup toward the ground when cocking the string of the crossbow, the foot-receiving portions including a plurality of juxtaposed grooved sections along the foot-receiving portions,
wherein the pair of cantilevered foot-receiving portions of the stirrup damps vibrations created by the return of the pair of limbs from the proximal position to the distal position, the vibrations being transmitted through the body, distally transmitted through the cantilevered support and orthogonally transmitted in the pair of cantilevered foot-receiving portions, at least partially through the plurality of juxtaposed grooved sections, toward distal ends of the pair of cantilevered foot-receiving portions, and
wherein the stirrup further comprises a vibration absorber received within one of the plurality of juxtaposed grooved sections.

11. The vibration damping stirrup of claim 10, wherein the cantilevered foot-receiving portions are separated by the support extending between them.

12. The vibration damping stirrup of claim 10, wherein the pair of cantilevered foot-receiving portions comprises a lumped-mass system for damping vibrations when the string is released to propel the arrow.

13. The vibration damping stirrup of claim 10, wherein the stirrup is located below a longitudinal trigger axis that is axially projected from a trigger latch of the crossbow.

14. A stirrup, comprising:
a support adapted to attach to a body of a crossbow at a distal end thereof and extend distally from the body,
a pair of cantilevered foot-receiving portions connected to a distal end of the support, with a first foot-receiving portion of the pair extending from the distal end of the support to a distal end of the first foot-receiving portion on a first side of the support, and a second foot-receiving portion of the pair extending from the distal end of the support to a distal end of the second foot-receiving portion on a second side of the support that is opposite to the first side of the support, and
a vibration absorber receiver configured to receive a vibration absorber for dissipating vibrations at a distal end of the foot-receiving portions, and a vibration absorber received by the vibration absorber receiver.

15. The stirrup of claim 14, wherein the vibration absorber receiver comprises a groove formed in a foot-receiving portion at the distal end thereof.

16. The vibration damping stirrup of claim 14, wherein the vibration absorber comprises rubber.

17. The stirrup of claim 14, wherein the cantilevered foot-receiving portions are separated by the support extending between them.

18. The stirrup of claim 14, wherein the stirrup comprises a polymer including fibers therein to further reinforce the stirrup.

19. The vibration damping stirrup of claim 14, wherein the pair of cantilevered foot-receiving portions comprises a lumped-mass system for damping vibrations when the string is released to propel the arrow.

20. The vibration damping stirrup of claim 14, wherein the vibration absorber comprises a mass-ended cantilever portion.