Abstract:
A nock body may include a first end and an opposing second end. A nock housing may include a proximal end that engages the first end of the nock body and a distal end opposite the proximal end. A slot may be defined in the nock housing beginning at the distal end that extends in a direction of the proximal end. An LED/battery assembly may be disposed at least partially inside of the nock housing. A fastener may be secured to the nock housing in a location that causes a width of the slot to narrow and secure the LED/battery assembly. A groove may be defined in the nock body beginning at the first end that extends towards the second end. A nock activation lockout can be provided to block an LED activation gap from closing so that the LED does not unintentionally turn on.

Description:
PRIORITY 
     This application is a continuation of U.S. patent application Ser. No. 14/330,125, filed on Jul. 14, 2014, which is a continuation of U.S. patent application Ser. No. 14/176,829, filed on Feb. 10, 2014, now U.S. Pat. No. 8,777,786, which claims the benefit of priority based on U.S. Provisional Application Ser. No. 61/843,712 filed on Jul. 8, 2013, and all of the foregoing applications are hereby incorporated by reference herein in their entirety. 
    
    
     FIELD 
     The present invention relates to arrow systems, and more particularly, to a lighted nock that can be deactivated to save battery power and prevent accidental activation in the field. 
     BACKGROUND 
     The use of lighted nocks for bow hunting is known. Lighted nocks are beneficial because they allow the hunter to track prey shot with an arrow, particularly in low-light conditions. However conventional lighted nocks are inconvenient to use. 
     Lighted nocks are typically lighted with a light emitting diode (LED) powered by a small battery, typically lithium-type. The nock is either clear or translucent so that the LED light source can light up the nock when the battery power is applied. Typically the act of inserting the battery/LED lights up the nock. The act of inserting the battery requires that the nock assembly be removed from the arrow shaft. Then the assembly must be re-installed once the nock is lit. The nock must be removed again to turn the light off. 
     The need to repeatedly remove the nock in the field is awkward, inconvenient and might lead to a missed shot opportunity. Also, the repeated removal and insertion of the nock can damage the arrow shaft and/or nock assembly over time. It is not desirable to pre-light the nocks prior to hunting because of battery life concerns and because of the potential that the lit nocks will spook prey if the lights are seen. Therefore, there is a need to provide an improved lighted nock system. 
     SUMMARY 
     The present disclosure teaches various example embodiments that address certain disadvantages in the prior art. A lighted nock system, apparatus and method are disclosed. An activation collar is provided to a nock to permit activation/de-activation of the LED light source without the need to remove the nock from the arrow shaft. A nock adaptor can be provided to a nock housing end portion to provide a range of outside diameters to the shaft-mating end of the nock. The nock adaptors thus permit the lighted nock system to fit a range of arrow shaft sizes (inside diameters). The lighted nock and a plurality of adaptor sizes can be provided together in a single package or kit that will fit most standard carbon and aluminum arrow shafts. A method of operating the lighted nock system and device is also disclosed. 
     According to certain example embodiments, a lighted nock device includes a nock body, the nock activation collar, a nock housing and LED/battery assembly. The nock body includes a first plurality of radially arrayed teeth and a plurality of gaps defined between the teeth. The nock activation collar is disposed adjacent the first plurality of teeth. The collar includes a second plurality of radially arrayed teeth projecting longitudinally outwards towards the first plurality of teeth. The second plurality of teeth are configured to interleave with the first plurality of teeth in a first rotational position when the second plurality of teeth are rotationally aligned with the gaps between the first plurality of teeth. The second plurality of teeth are configured to abut the first plurality of teeth in a second rotational position when the second plurality of teeth are rotationally aligned with the first plurality of teeth. 
     According to another example embodiment, a lighted nock kit for arrow shafts comprises a package. In the package are disposed a lighted nock, and first and second adaptors. The lighted nock assembly includes a shaft insertion portion having a first diameter dimension. The first adaptor includes an internal opening having an internal diameter conforming to the first diameter dimension of the shaft insertion portion of the lighted nock assembly. The first adaptor has a first adaptor outside diameter larger than the first end outside diameter dimension of the shaft insertion portion of the lighted nock assembly. The second adaptor includes an internal opening having an internal diameter conforming to the first diameter dimension of the shaft insertion portion of the lighted nock assembly. The second adaptor has a second adaptor outside diameter larger than the first adaptor outside diameter. 
     In a further example embodiment, a method of operating a lighted nock includes placing the lighted nock in a deactivated mode by rotating a nock activation collar with respect to a nock body until a plurality of teeth defined in the nock body are abutting and aligned with a plurality of teeth defined in the nock activation collar, thereby preventing the nock body from moving longitudinally inward towards a nock housing to close a light activation gap in response to pressure applied to a distal end of the nock body. The lighted nock is placed in a ready to fire mode by rotating the nock activation collar with respect to a nock body until the plurality of teeth defined in the nock body are offset from the plurality of teeth defined in the nock activation collar such that the plurality of teeth defined in the nock activation collar are aligned with gaps defined between the plurality of teeth defined in the nock body. The lighted nock is placed in a lit mode by pressing on the distal end of nock body when the lighted nock is in the ready to fire mode with a sufficient force to close the activation gap between the nock body and the nock housing. The lighted nock is returned to the ready to fire mode by moving the nock body distally away from the nock housing to open up the activation gap. All of the foregoing steps can be performed while the lighted nock remains inserted into the end of an arrow shaft. 
     The detailed technology and preferred embodiments implemented for the subject invention are described in the following paragraphs accompanying the appended drawings for people skilled in this field to well appreciate the features of the claimed invention. It is understood that the features mentioned hereinbefore and those to be commented on hereinafter may be used not only in the specified combinations, but also in other combinations or in isolation, without departing from the scope of the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded perspective view of a lighted nock system for an arrow shaft according to an example embodiment of the present invention. 
         FIG. 2  is a front view of a packaged lighted nock system kit for arrow shafts according to an example embodiment of the present invention. 
         FIG. 3  is an assembly perspective view of a lighted nock system for arrow shafts according to an example embodiment of the present invention. 
         FIG. 4  is a perspective view of an LED and battery assembly for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 5  is a side view of an LED and battery assembly for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 6  is a perspective view of a universal nock for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 7  is a rear view of a universal nock for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 8  is a front view of a universal nock for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 9  is a bottom view of a universal nock for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 10  is a top view of a universal nock for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 11  is another perspective view of a universal nock for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 12  is a side view of a universal nock for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 13  is another side view of a universal nock for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 14  is a perspective view of a nock activation collar for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 15  is a rear view of a nock activation collar for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 16  is a front view of a nock activation collar for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 17  is a side view of a nock activation collar for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 18  is a perspective view of a nock housing for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 19  is a side view of a nock housing for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 20  is a top view of a nock housing for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 21  is a cross-section side view of a nock housing for a lighted nock system according to an example embodiment of the present invention taken along line a-a of  FIG. 20 . 
         FIG. 22  is a cross-section end view of a nock housing for a lighted nock system according to an example embodiment of the present invention taken along line b-b of  FIG. 20 . 
         FIG. 23  is a perspective view of a battery retention screw for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 24  is a side view of a battery retention screw for a lighted nock system according to an example embodiment of the present invention. 
         FIG. 25  is a perspective view of a lighted nock system for arrow shafts in a deactivated mode according to an example embodiment of the present invention. 
         FIG. 26  is a perspective view of a lighted nock system for arrow shafts in a ready to fire mode according to an example embodiment of the present invention. 
         FIG. 27  is a perspective view of a lighted nock system for arrow shafts in a activated mode according to an example embodiment of the present invention. 
         FIG. 28  is a side view of a lighted nock system for arrow shafts in a deactivated mode according to an example embodiment of the present invention. 
         FIG. 29  is a side view of a lighted nock system for arrow shafts in a lighted or ready-to-fire mode according to an example embodiment of the present invention. 
         FIG. 30  is a side view of a lighted nock system for arrow shafts in a activated mode according to an example embodiment of the present invention. 
         FIG. 31  is a perspective view of a shaft adapter for a lighted nock system for arrow shafts according to an example embodiment of the present invention. 
         FIG. 32  is a longitudinal cross section side view of a shaft adapter for a lighted nock system for arrow shafts according to an example embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     In the following description, the present invention will be explained with reference to example embodiments thereof. However, these example embodiments are not intended to limit the present invention to any specific environment, applications or particular implementations described in these example embodiments. Therefore, description of these example embodiments is only for purpose of illustration rather than limitation. It should be appreciated that, in the following example embodiments and the attached drawings, elements unrelated to the present invention are omitted from depiction; and dimensional relationships among individual elements in the attached drawings are illustrated only for ease of understanding, but not to limit the actual scale. 
     While the invention is amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit the invention to the particular example embodiments described. On the contrary, the invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. 
     Referring to  FIG. 1 , the lighted nock assembly  100  is shown in axial alignment with three different size nock sleeves or nock adaptors  102   a ,  102   b  and  102   c . Each adaptor has a different outside diameter (OD) corresponding to certain common inside diameters (ID) of arrow shafts  104 . For example, adaptor  102   a  for 0.204 inch shaft ID, adaptor  102   b  for 0.233 inch shaft ID and adaptor  102   c  for 0.244 inch shaft ID are all shown. Other adaptor sizes can be provided without departing from the scope of the invention. 
     The inside diameter of each of the nock adaptors  102   a ,  102   b  and  102   c  is the same so that a single lighted nock assembly  100  can be used universally with all of the different OD size adapters. In one example, the inside diameter of the adaptors is 0.165 inches. In this example, the outside diameter of the portion of the nock assembly  100  that is inserted into the adaptor is sized to fit 0.165 inch ID arrow shafts. Thus, the nock assembly  100  would be used without an adapter for 0.165 inch ID arrow shafts, and with a respective adaptor  102   a ,  102   b  and  102   c  for 0.204, 0.233 and 0.244 inch shaft IDs. Currently 0.165 inch shaft IDs are the smallest widely used by hunters, but the present invention can be adapted to smaller shafts and used with a wider variety of adaptors without departing from the scope of the invention. 
     The feature of using one standard nock size with a variety of adaptors to fit with a variety of different arrow ID shafts reduces the need for manufacturing more than one size lighted nock. This feature also eliminates the need for the store to maintain inventory and merchandise more than one lighted nock size. The user also cannot accidentally purchase the wrong size of lighted nock for their particular shaft ID. Furthermore, the user now has the ability to use the same lighted nock for multiple arrow shaft ID sizes that they may use for targets or hunting by simply moving the lighted nock from shaft to another with the use of the adaptors that are all provided in the original package (kit). 
     A single “universal fit” package or kit  106  can be provided, as shown in  FIG. 2 , that contains one or more lighted nock assemblies  100  and a variety of nock adaptors  102   a ,  102   b  and  102   c , each in a plurality of sizes. In a preferred embodiment, there is the same number of nock adaptors as the number of lighted nock assemblies  100 . More or fewer numbers of nock assemblies and knock adaptors can be provided in a single package without departing from the scope of the invention. Additionally, an instruction sheet can be disposed in the package or the instructions can be incorporated into the packaging itself. 
     The packaging comprises a full or partial plastic shell  108  including joined front and back panels in a preferred embodiment. An aperture  109  can be defined adjacent the top edge to allow for hanging by a post in the store display. 
     Referring now to  FIG. 3 , the lighted nock system or device  100  components are shown. The nock assembly comprises a nock body  110 , a battery/LED assembly  112 , a nock activation collar  114  disposed around the outside diameter of the first end of the nock body  110 , and a nock housing portion  116 . The LED end of the battery/LED assembly  112  is secured to the nock body  110 . The second end of the nock body  110  defines a channel portion configured to receive the string of the bow. The housing portion  116  includes a first end configured for insertion into the inside diameter of the arrow shaft and a second end that defines an aperture for receiving the first end of the nock body  110 . Raised male index tabs  118  adjacent the first end of the nock body are configured to engage respective recessed female index slots  119  defined in the second end of the housing  116 . 
     The lighted nock system is assembled by securing the LED end of the LED/Battery assembly  112  to the nock body  110  via the first end of the nock body. In one embodiment, ultraviolet curable glue is used to accomplish the securing. Other securing methods and means can also be employed. For example, heat staking or ultrasonically welding the nock body to the LED end of the LED/Battery assembly can be used. A mechanical pin or “C” clip can also be driven through the nock body and the LED end of the LED/Battery assembly to join the two components in other alternatives. 
     The activation collar  114  is slid over the first end of the nock body  110  with the teeth facing away from the first end. The activation collar is installed with the LED in the “Off” or deactivated position, as will be discussed in detail below, to set the activation gap  180  for the lighted nock  100 . Then the nock body assembly is mated with the nock housing  116  by inserting the first end of the nock body into the receiving end (second end) of the housing  116  until the components are fit together. 
     The battery end of the LED/battery assembly  112  is then secured to the housing  116 . In the illustrated embodiment, the distal end of the battery portion is secured via a battery retention screw  124  that tightens the two halves  122  of the first end together to close the gap  120 , which grips the battery portion securely. Alternatively, the battery portion can be glued in place or attached in a similar manner to the LED end as discussed previously. In the glued embodiment, the first end of the housing  116  need not be configured to form the gap  120 . A simple bore can be provided with the necessary clearance for the battery portion distal end. 
     The lighted nock assembly  100  is rotationally indexable with respect to the arrow shaft in which it is inserted. The activation collar  114  includes a raised index tab  125  (shown in  FIGS. 14-16 ) on the outside of the part to indicate a visual alignment target with the odd colored vane “Cock Vane” of the arrow. The lighted nock assembly  100  is installed into the arrow shaft with this index mark  125  aligned with the cock vane. This indexability feature is an advantage over other conventional lighted nocks because the present invention can be aligned to the stiff part of the arrow “spine” and cannot rotate out of position after several shots. 
     Another advantage of certain embodiments is that the index position will not be lost by operation of the lighted nock assembly. The raised male index tabs  118  of the nock body  110  engage the recessed female index slots  119  of the housing  116  when the two components are secured together. This configuration prevents rotation of the nock body  110  with respect to the nock housing  116 , while permitting these respective components to still move longitudinally with respect to one another. 
     Referring to  FIGS. 4-5 , the LED/battery assembly  112  comprises an LED portion  126  and a battery portion  128 . The LED/battery assembly is commercially available as a complete assembly from companies such as SHENZHEN POWER STATIONS LTD. and details of such suitable LED/battery assembly is disclosed in Chinese Patent 201636546, entitled “Electronic luminous rod and electronic product.” Other suitable LED/battery assemblies can also be used without departing from the scope of the invention. The use of commercially available LED/battery assemblies allows for embodiments of the invention wherein the batteries and/or LED/Battery assemblies can be replaced. 
     The LED light can be of any brightness and color desired by the user. The battery is preferably a lithium type battery due to the size/capacity advantages of such type. However, other battery types can be used (including multiple batteries in series or parallel) without departing from the scope of the invention. 
     The LED/battery assembly  112  shown in  FIGS. 4-5  appears in the off or deactivated state. In the off state, the LED portion  126  is spaced longitudinally away from the battery portion  128  to define a gap  129  between the respective portions. In this state, the circuit between the battery and LED components is open. The LED is activated, or turned on, by applying a force to contract the two portions  126  and  128  together to reduce or eliminate the gap  129 . Closing the gap completes the internal circuit to energize the LED. The gap  129  is opened again by applying force to pull the two portions  126  and  128  apart to open the gap, thereby turning the LED off. In a preferred embodiment, there is a defined detent at each of the off and on positions so that the on and off positions can be maintained until a deliberate force is applied to move the respective components to the opposite state. 
     Referring now to  FIGS. 6-13 , various views of the nock body  110  are shown. The nock body  110  has a first end  130  and second end  132 . The first end  130  is shaped to protrude towards the arrow shaft and insert into the nock housing. The first end  130  includes a hollow internal cavity or pocket  134  with a shape and diameter corresponding to the LED/battery assembly  112  so that the assembly can be received within the cavity  134 . The second end  132  defines a channel  136  configured to accept a bow string. 
     A portion of the outer surface of the first end portion  130  is provided with a male or raised guide protrusion  138  (also designated as reference  118  in  FIG. 3 ). This guide protrusion  138  is longitudinally elongated and has a profile corresponding to the recess in the housing (discussed below). The protrusion/recess pair cooperates to prevent rotation of the nock body  110  with respect to the nock housing  116 . However, longitudinal “in-and-out” movement is permitted in order to allow the gap  129  in the LED/battery assembly to be opened and closed. The figures show two guide protrusions located opposite one another in the figures. However a single protrusion can be used, or more than two such protrusions can be used, without departing from the scope of the invention. 
     The second end  132  can take different forms or shapes to suit the particular application. For example, the channel can be eliminated or reduced for cross-bow applications where a relatively deep channel is not utilized. 
     A nock alignment tab  140  extends outward from the nock body. This tab  140  allows the user to feel and/or quickly observe the relative rotational position of the activation collar  114  with respect to the nock body  110 . 
     The diameter of the first end  130  is smaller than the diameter of the second end  132 . This configuration allows the first end  130  to be inserted into the housing  116 , while the second end  132  remains external to the housing  116 . The interface between the first and second ends forms a stop surface  142 . A plurality of teeth  144  protrude forward from the stop surface  142  toward the first end  130 . The teeth  144  are radially arrayed around the stop surface  142  to define a groove  146  or gap between each of the adjacent teeth. 
     Referring to  FIGS. 14-17 , the nock activation collar  114  will now be described in further detail. The collar  114  is generally ring-shaped. The inner surface  148  defines an aperture with a diameter slightly larger than the outside diameter of the first end  130  of the nock body  110 . The inner surface also defines relief zones  150  to provide for clearance for the nock body protrusions  138  (or  118 ) through the full range of the collar&#39;s rotational travel. The width of the relief zones  150  is selected to define the extent of the rotational travel (e.g. 45 degrees) that the collar  114  can rotate with respect to the nock body  110 . The rotational travel is restricted where the relief zone  150  ends and the male index tab or guide protrusion  118  contacts the interface of the relief zone and inner surface  148  nominal diameter. 
     The collar  114  outer surface  152  defines a raised index tab  125  that can be used for indexing of the nock assembly with respect to the arrow shaft, as described herein above. The index tab  125  can also be used for providing a visual and/or touch indication of the relative rotational position of the collar  114  with respect to the nock body  110 . 
     A first end surface  154  of the collar spanning between the outer  152  and inner  148  surfaces is generally smooth. This first end  154  in operation faces the housing  116 . 
     A second end surface  156  of the collar opposite the first and spanning between the outer  152  and inner  148  surfaces includes a plurality of radially arrayed teeth  158 . A groove  160  or gap is defined between each of the adjacent teeth  158 . This second end  156  in operation faces away from the housing  116 . 
     Referring to  FIGS. 18-22 , the nock housing  116  will now be described in further detail. The housing  116  has a first end portion  162  configured to be inserted into an adaptor or into the open end of an arrow shaft with an ID of 0.165″. Other diameters are also contemplated. The housing  116  also has an opposing second end portion  164  configured to receive the first end of the nock body  110  and the battery portion of the LED/battery assembly  112 . 
     An internal channel  166  extends inwardly from the second end portion  164  and continues forward through a portion of the first end portion  162 , thereby defining a channel depth. The shape and dimensions of the channel  166  conform to the outer dimensions of the first end  130  of the nock body  110  and the protruding portion of the battery portion  128 . The female guide recesses  168  (reference  119  in  FIG. 3 ) are defined in the channel corresponding to the male guide protrusions  118  or  138  of the nock body. 
     A shaft insertion stop surface  170  is defined at the juncture of the first  162  and second  164  portions of the housing  116 . This stop surface  170  abuts the end surface of the arrow shaft (or an adaptor  102 ) to define the insertion depth of the nock assembly. 
     The outer end surface  172  of the second end portion  164  defines a stop surface defining the insertion depth of the nock body  110  until contact is made with the collar  114 . The smooth end  154  of the collar  114  can freely slide against the smooth end surface  172 . 
     A tip portion  174  of the first end  162  can be split into a plurality of segments  122  separated by a gap  120  therebetween. A perpendicularly aligned screw hole  174  in one segment and threads in the opposing segment allows the respective segments  122  to be brought together to close the gap  120  by tightening a screw fastener  124 . This tightening action secures the battery end  128  of the LED/battery assembly  112  to the housing  116 . Such securing also secures the nock body  110  to the housing because the LED portion  126  of the LED/battery assembly  112  is also secured to the nock body  110 . Alternatively, the distal battery end of the LED/battery assembly can be secured to the housing  116  by other means, such as glue. In such alternative, the screw and split segments of the tip  174  are unnecessary. 
     The battery portion retention screw  124  according to one example embodiment is shown in  FIGS. 23-24 . The screw  124  comprises a head  176  configured to engage a screw driver and a threaded body  178 . 
     A shaft adaptor  182  for solid core shafts is shown in  FIGS. 31-32 . Some arrow shafts, such as those used for bowfishing, are solid, so they do not have a hollow center to allow insertion of the first end of the housing  161  into the arrow shaft. The adaptor  182  has a first end  184  defining a first aperture  186  sized and shaped to receive the first end of the nock housing as if the adaptor  182  were a hollow shaft. The adaptor  182  also has a second end  188  that defines a second aperture  190  sized and shaped to fit over a portion of the rear end of the arrow shaft. The inside diameter of the second aperture  190  closely conforms the arrow shaft&#39;s outer diameter for a snug fit. Glue can also be applied to the end of the arrow shaft for added securing of the adaptor  182  to the shaft. 
     The operating modes of the lighted nock assembly will now be described with respect to  FIGS. 25-30 .  FIGS. 25 and 28  illustrate the lighted nock system in the deactivated mode. In this mode, the nock activation collar  114  is rotationally offset 45 degrees counterclockwise with respect to the nock body  110  activation alignment orientation such that each of the tabs or teeth  144  of the nock body  110  abuts a corresponding tooth  158  of the collar  114 . This tooth-to-tooth alignment prevents the activation gap  180  (approximately 0.030 inches—corresponding to the gap  129  of the LED/battery assembly) between the collar  114  and nock body  110  from closing even in the presence of pressure applied to the second end  132  of the nock body  110 . Thus, the LED will not light up even if the arrow is drawn back in the bow and shot. 
     The deactivated mode is useful when the lighted mode of the arrow is not desired, such as during storage, transport, loading an arrow onto the bowstring or when target shooting in bright sunlight. It is desirable to practice with the arrow in the same weight and balance configuration as it will be in when hunting or shooting at game (prey) when it is appropriate to have nock light up. Conventional lighted nocks are undesirable to use for practice shooting because the batteries will be used up needlessly. Removing the battery to turn off the nock, if even possible, will dramatically alter the weight and balance of the arrow, so that the practice shot does not predict the arrow as it will be shot with the lighted nock. And repeated removal of the nock can weaken and damage the arrow shaft. The deactivated mode of the present invention therefore solves the above-noted problems with conventional lighted nocks. 
       FIGS. 26 and 30  illustrate the lighted nock system in the ready to fire mode. In this mode, the nock activation collar  114  is rotated 45 degrees clockwise from the deactivated alignment noted above such that each of the tabs or teeth  144  of the nock body  110  interleave with the corresponding teeth  158  of the collar  114 . This alignment allows the activation gap  180  between the collar  114  and nock body  110  to close when pressure is applied by the bow string to the second end  132  of the nock body  110 . Thus, the LED will light when the user shoots the arrow as the pressure from the bowstring will compress (close) the activation gap  180 , and thus the gap  129 , to energize the LED. This feature eliminates the possibility of the lighted nock activating when loading an arrow onto the string, which improves shot timing and reduces the likelihood that the prey notices the lit nock. 
       FIGS. 27 and 29  illustrate the lighted nock system in the activated mode after the gap  180  has been closed. The LED is now energized by the battery and the nock body  110  is lit. 
     The nock assembly can be unlit or turned off by pulling the nock body  110  longitudinally away from the housing  116  to open up the activation gap  180 . This returns the lighted nock assembly to the ready to fire mode. Rotating the collar  114  clockwise with respect to the nock body  110  by 45 degrees engages the deactivated mode. 
     As described above, the lighted nock assembly can be turned on and off and set in deactivated mode without the need to remove the nock from the arrow shaft. The nock can be secured to the arrow shaft via any conventional means such as press-fitting, or by the securing method disclosed in U.S. Patent Application Pub. No. 2013/0170900, which is hereby incorporated fully herein as part of this application. The present invention can also be used with a laser broadhead as disclosed in U.S. Patent Application Pub. No. 2012/0035006, which is also hereby incorporated fully herein as part of this application. 
     The various components of the arrow insert described herein can be formed from a variety of materials without departing from the scope of the invention. In one embodiment, the universal nock is clear or translucent plastic. The collar  114  and adaptor  102  can be plastic or metal (e.g. aluminum or magnesium). Some components, such as screw  124  are preferably metal. The size and material of screw  124  can be altered to alter weight and weight distribution. Additional weights can be added to the lighted nock assembly internal to the arrow shaft to change arrow weight, weight distribution and flight characteristics as well. 
     The above disclosure is related to the detailed technical contents and inventive features thereof. People skilled in this field may proceed with a variety of modifications and replacements based on the disclosures and suggestions of the invention as described without departing from the characteristics thereof. For example, the invention is also applicable to cross bows, bowfishing, sling bow fishing/hunting, spear fishing guns and other projectiles that would benefit from lighted ends. Nevertheless, although such modifications and replacements are not fully disclosed in the above descriptions, they have substantially been covered in the following claims as appended.