BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to expandable baton and more particularly to an expandable baton having replaceable inner support tubes.
2. Description of Related Art
Expandable batons are widely used by law enforcement personnel or as a personal protection means. A conventional expandable baton comprises a plurality of telescopic tubes is shown in FIGS. 6 and 7. The baton is expandable between an extended position and a retracted position (see FIGS. 6 and 7). As shown, a smaller tube 60 is partially retracted into a larger tube 62. At the extended position, the smaller tube 60 extends out of an end of the larger tube 62 and is locked. As an end, the baton is expanded.
However, an annular groove 64 is required to form on an inner surface of the larger tube 62 for locking the smaller tube 60 in the larger tube 62 and the larger tube 62 is required to have an increased wall thickness for the forming of the annular groove 64. Thus, a sufficient space is provided for the forming of the annular groove 64. Unfortunately, the greater wall thickness of the larger tube 62 can greatly increase its weight and make manufacturing more difficult. Further, a frequent retraction and extension of the smaller tube 60 relative to the larger tube 62 can greatly, quickly wear the inner surface of the larger tube 62. The smaller tube 60 cannot be stably disposed in the worn larger tube 62.
Thus, the need for improvement still exists.
SUMMARY OF THE INVENTION
It is therefore one object of the invention to provide an expandable baton comprising a first tube including internal threads on an inner surface of a second end; a second tube; a first inner support tube having a diameter less than that of the first tube, the first inner support tube including first external threads on an outer surface, the first external threads being secured to the internal threads of the first tube; a second inner support tube having a diameter less than that of the first tube, the second inner support tube including second external threads on an outer surface, the second external threads being secured to the internal threads of the first tube, the second inner support tube spaced from the first inner support tube with a first annular groove formed between them; a second lock mechanism disposed at one end of the second tube and including two second lock protuberances and a second externally threaded connection wherein the second externally threaded connection includes a second shoulder adjacent to the second lock protuberances, an inner diameter of the second inner support tube is less than an outer diameter of the second externally threaded connection, the outer diameter of the second externally threaded connection is less than an inner diameter of the first inner support tube so that the second externally threaded connection is disposed in a first end of the second tube and the second shoulder urges against the first end of the second tube, a distance between each of the second lock protuberances and the second shoulder is equal to a length of the first annular groove, the second lock mechanism is moveably secured to the first annular groove, and the second tube is moveably disposed in the first tube; a release mechanism including an axially moveable lock needle having a pointed second end and a pushbutton at a first end, the pushbutton projecting out of the first tube wherein a pressing of the pushbutton moves the lock needle to either insert into or disengage from the second lock mechanism, thereby retracting the second lock protuberances to an unlocked position or extending the second lock protuberances to a locked position; and a positioning member for limiting the release mechanism at a first end of the first tube.
Preferably, further comprises a first lock mechanism at the first end of the first tube, the first lock mechanism including two first lock protuberances and a first externally threaded connection, the first externally threaded connection including a first shoulder adjacent to the first lock protuberances, the first externally threaded connection being disposed in the first end of the first tube and the first shoulder urges against the first end of the first tube, and the first tube being moveably disposed in a third tube; and a second annular groove formed on an inner surface of the third tube wherein a distance between each of the first lock protuberances and the first shoulder is equal to a length of the second annular groove, and the first lock mechanism is moveably secured to the second annular groove.
Preferably, further comprises a first through hole axially disposed through the first lock mechanism and a second through hole axially disposed through the second lock mechanism wherein the lock needle is disposed through each of the first through hole and the second through hole to be locked or clears same to be unlocked.
Preferably, further comprises at least one first O-ring disposed on an outer of the first lock mechanism and at least one second O-ring disposed on an outer of the second lock mechanism.
Preferably, further comprises at least one first wear resistant ring disposed on an inner surface of the first tube.
Preferably, further comprises at least one second wear resistant ring disposed on an inner surface of the third tube.
Preferably, further comprises a plug threadedly secured to a second end of the second tube.
The invention has the following advantages and benefits in comparison with the conventional art: Easy forming. This is because after inner surfaces of both the first inner support tube and the second inner support tube are worn to a predetermined extent, both the first inner support tube and the second inner support tube can be pulled out of the first tube and replaced with new ones. The first annular groove can be formed by forming the internal threads and threadedly securing both the first inner support tube and the second inner support tube to the internal threads sequentially. Wall thickness of the first tube is decreased greatly.
Greatly decreased components replacement cost. This is because the second tube is moveably disposed in the first tube and components are subject to wear and therefore a frequent replacement is required Further, this can greatly decrease the difficulties of manufacturing the first tube. Because the first inner support tube and the second inner support tube are threadedly to inside of the first tube. Thus, only both the first inner support tube and the second inner support tube are required to replace rather than the first tube. In comparison with replacing the first tube, the cost of replacing both the first inner support tube and the second inner support tube is relatively small.
The above and other objects, features and advantages of the invention will become apparent from the following detailed description taken with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded view of an expandable baton according to the invention;
FIG. 2 is a longitudinal sectional view of the assembled expandable baton in an extended position;
FIG. 3 is a view similar to FIG. 2, the assembled expandable baton being in a retracted position;
FIG. 4 is an enlarged view of the central, right portion of FIG. 2 showing the second tube partially extended out of the first tube;
FIG. 5 is a view similar to FIG. 4 showing the second tube partially retracted into the first tube;
FIG. 6 is a longitudinal sectional view showing a smaller tube secured to a larger tube by snapping according to the conventional art; and
FIG. 7 is a longitudinal sectional view of the larger tube according to the conventional art.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIGS. 1 to 3, an expandable baton in accordance with the invention comprises a first tube 10, a first inner support tube 121, a second inner support tube 122, a second tube 20, a release mechanism 30 and a positioning member 19 as discussed in detail below. As shown in FIG. 1, the first inner support tube 121 and the second inner support tube 122 are taken as an embodiment. The first tube 10 includes internal threads 11. A diameter of the first inner support tube 121 is less than that of the first tube 10. First external threads 131 are disposed on an outer surface of the first inner support tube 121. The first external threads 131 are secured to the internal threads 11 of the first tube 10. A diameter of the second inner support tube 122 is less than that of the first tube 10. Second external threads 132 are disposed on an outer surface of the second inner support tube 122. The second external threads 132 are secured to the internal threads 11 of the first tube 10. The second inner support tube 122 is spaced from the first inner support tube 121 with a first annular groove 14 formed between them. A second lock mechanism 21 is provided at a first end of the second tube 20 and includes two second lock protuberances 211 and a second externally threaded connection 22. The second externally threaded connection 22 includes a second shoulder 221 adjacent to the second lock protuberances 211. An inner diameter of the second inner support tube 122 is less than an outer diameter of the second externally threaded connection 22. The outer diameter of the second externally threaded connection 22 is less than an inner diameter of the first inner support tube 121. Thus, the second externally threaded connection 22 is disposed in the first end of the second tube 20 and the second shoulder 221 urges against the first end of the second tube 20. A distance between each of the second lock protuberances 211 and the second shoulder 221 is equal to a length of the first annular groove 14. The second lock mechanism 21 is moveably secured to the first annular groove 14. The second tube 20 is moveably disposed in the first tube 10. A plug 24 is threadedly secured to a second end of the second tube 20. The release mechanism 30 includes an axially moveable lock needle 31 having a pointed second end and a pushbutton 32 at a first end, the pushbutton 32 projecting out of the first tube 10. A pressing of the pushbutton 32 moves the lock needle 31 to either insert into or disengage from the second lock mechanism 21. As a result, the second lock protuberances 211 retract to be unlocked or extend to be locked. The positioning member 19 is used to limit the release mechanism 30 at a first end of the first tube 10. While the positioning member 19 is disposed at a first end of a third tube 40 for the purpose of increasing length of the expandable baton in FIGS. 1 to 3, the third tube 40 can be eliminated to limit the release mechanism 30 at the first end of the first tube 10.
As shown in FIG. 1 in conjunction with FIG. 2, at the first end of the first tube 10 there is provided a first lock mechanism 15 including two first lock protuberances 151 and a first externally threaded connection 16. The first externally threaded connection 16 includes a first shoulder 161 adjacent to the first lock protuberances 151. The first externally threaded connection 16 is disposed in the first end of the first tube 10 and the first shoulder 161 urges against the first end of the first tube 10. The first tube 10 is moveably disposed in the third tube 40. A second annular groove 41 is formed on an inner surface of the third tube 40. A distance between each of the first lock protuberances 151 and the first shoulder 161 is equal to a length of the second annular groove 41. The first lock mechanism 15 is moveably secured to the second annular groove 41. A first through hole 17 is axially provided through the first lock mechanism 15 and a second through hole 23 is axially provided through the second lock mechanism 21 respectively. The lock needle 31 may dispose through each of the first through hole 17 and the second through hole 23 to be locked or clear same to be unlocked. A t least one O-ring (two are shown) 50 is provided on an outer of the first lock mechanism 15 and at least one O-ring (two are shown) 51 is provided on an outer of the second lock mechanism 21 both for the purpose of increasing friction. Further, at least one wear resistant ring (one is shown) 18 is provided on an inner surface of each of the first tube 10 and the third tube 40 for the purpose of adding resistance to each of the first tube 10 and the third tube 40.
As shown in FIG. 2 specifically, it is a longitudinal sectional view of the assembled expandable baton in an extended position. After the assembled baton has been extended, the second lock mechanism 21 is fastened at the first annular groove 14, i.e., the second tube 20 being attached to the second end of the first tube 10. As a result, the extended baton is fastened. For further expanding the baton, the third tube 40 can be attached to the first end of the first tube 10 rather than the second end of the tube 10 which is attached to the second tube 20. With the first lock mechanism 15 fastened at the second annular groove 41, the third tube 40 is attached to the first end of the first tube 10. At this time, the release mechanism 30 is disposed at the first end of the third tube 40 (i.e., opposite to the first end of the first tube 10) with the lock needle 31 not passed through the first through hole 17. As a result, both the first lock mechanism 15 and the second lock mechanism 21 are locked.
As shown in FIG. 3 in conjunction with FIG. 2 specifically in which FIG. 3 is a longitudinal sectional view of the assembled expandable baton in a retracted position. The lock needle 31 of the release mechanism 30 passes through the first through hole 17 and the second through hole 23 sequentially to unlock both the first lock mechanism 15 and the second lock mechanism 21. Thus, the first lock mechanism 15 clears the second annular groove 41, the second lock mechanism 21 clears the first annular groove 14, the second tube 20 is retracted into the first tube 10, and the first tube 10 is retracted into the third tube 40 respectively. As an end, the expandable baton is retracted.
Referring to FIG. 4, it is an enlarged view of the central, right portion of FIG. 2 showing the second tube 20 partially extended out of the first tube 10. The elongated internal threads 11 are formed on the inner surface of the first tube 10 with both the first inner support tube 121 and the second inner support tube 122 threadedly fastened therein. A total length of the first inner support tube 121 and the second inner support tube 122 is less than a length of the internal threads 11. Thus, the first annular groove 14 is formed among the first inner support tube 121, the second inner support tube 122 and the internal threads 11. The second lock mechanism 21 is locked by the first annular groove 14. As a result, the second tube 20 is attached to a predetermined position in the first tube 10.
Referring to FIG. 5, it is an enlarged view of the central, right portion of FIG. 2 showing the second tube 20 partially retracted into the first tube 10. As indicated by arrow, the lock needle 31 passes through the second lock mechanism 21 to cause the second lock mechanism 21 to clear the first annular groove 14. As a result, the second tube 20 is moveably disposed in the first tube 10.
The invention has the following advantages and benefits in comparison with the conventional art: After inner surfaces of both the first inner support tube 121 and the second inner support tube 122 are worn to a predetermined extent, both the first inner support tube 121 and the second inner support tube 122 can be pulled out of the first tube 10 by rotation and replaced with new ones. Thus, only both the first inner support tube 121 and the second inner support tube 122 are replaced rather than the first tube 10. This can greatly decrease the components replacement cost. Further, this can greatly decrease the difficulties of manufacturing the first tube 10. The first annular groove 14 can be formed by forming the internal threads 11 and threadedly securing both the first inner support tube 121 and the second inner support tube 122 to the internal threads 11 sequentially.
While the invention has been described in terms of preferred embodiments, those skilled in the art will recognize that the invention can be practiced with modifications within the spirit and scope of the appended claims.
Patent Application
20220228836
