CA2120914A1 - Retractable point system for a dart - Google Patents
Retractable point system for a dartInfo
- Publication number
- CA2120914A1 CA2120914A1 CA002120914A CA2120914A CA2120914A1 CA 2120914 A1 CA2120914 A1 CA 2120914A1 CA 002120914 A CA002120914 A CA 002120914A CA 2120914 A CA2120914 A CA 2120914A CA 2120914 A1 CA2120914 A1 CA 2120914A1
- Authority
- CA
- Canada
- Prior art keywords
- dart
- point
- cylindrical
- bore
- sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B6/00—Projectiles or missiles specially adapted for projection without use of explosive or combustible propellant charge, e.g. for blow guns, bows or crossbows, hand-held spring or air guns
- F42B6/003—Darts
Abstract
A novel dart (10) is equipped with a dart point contraction system which allows the dart point (14) to contract into the body (11) or barrel of the dart as when the dart point (14) impacts wire, or staples and the like which surmount boundaries of denominated regions of a dartboard. The dart body (11) defines a cylindrical cavity (33) into which the downstream end of the dart point (14) can reciprocatingly travel since it also is cylindrical and comes to rest against the dart body (11) at the end of its travel. It is as a result of the kinetic energy of flight that even though the dart point (14) may have impacted a boundary wire or even a denominated region of the dartboard, that "bounce-out" is inhibited by the cylindrical portion (20) of the dart point (14) travelliing in the cylindrical cavity (33) of the dart body (11) when impact occurs.
Description
~ wo 94/03242 2 1 2 0 9 1 4 PCT/CA93/00320 RETRACTABLE POINT SYSTEM FOR A DART
This invention relates to darts, as used in a game of skill, now uni~ersally known and played around the world as both a leisure and as a competitive sport or game.
BACKGROUND ~O THF._IN OE NTION
, ~ prior art device is disclosed in a U~S~A.
,, patent issued 6 October, 1987 as Patent No. 4,697,815to one ~cKenna for a ~A~T. That particular patent d~scribes a tapered point which is seized, in its . forward and extended position, by a collar which has a thread to matingly thread into a threaded portion in a cylindrical-like cavity defined by the dart body. The machining of the threaded collar and female mating thread in the body is exp~nsive; furthermore, the construction of a fully tapered point, with the butt end t iS ~lso expen~i~e. Another dart with retractable j point is disclosed by Bott~esen in his U.S.A. Patent `~ No. 4,230,322 issued 28 Qctober, 1980.
It~is an object of the invention to eliminate ~ such threads and~as 8ubstitution to provide a split ;~ ~ sle~ve in frictional engagement with a step bore : defined by:the dart body as means for retaining the point in the dart body, during f~ight, while allowing the point to~reciprocatin~ly travel within the dart ~,: : body and,~when it îs in the dart point outwardly ;extended~position, o lock agains~ the split sleeve so as to lock~it in outward engagemen~. When the dart : :point hits~ a denomina~ed dartboard region, it : 30 penetrates it;`while,~if the ~artpoint~hi~s a ~oundary~
wire surmounted~on the dart~board partitioning two denominated~regions, the kinetic energy o~ the dart body causes he downstream end of the dart point to : : migrate into the cylîndrical cavity defined by the dart body~while appIying a constant pressure, during ;.
~: this migration, on the dart point due to ~he momentum of the dart point against the wire, encouraging the ..
i ~ .
., ;
, ~094/03~2 : P~Tt~93/~0320 2120~14 `:
point to ~ravel over the wire and thus, to penetrate into a denominated region of the dartboard; this re~ucing l'bounce-out". I
In a similar fashion, when a dart is flung, it impacts a denomi~ated reyion directl~, the a~oresaid action still ~liminates ~Ibounce-ou~l~ should the point tip be dull or otherwise damaged.
The primary object of the invention ~o accomplish the afore~aid with, simplicity, enhancing manufacturi~g ef~iciency, by way of the construction of a less expensive product which eliminates threads and the like or, other machining means, adapted to constrain the point in a forward position.
It is another object of the invention to allow or enable the reduction in diametrical size of the dart body or dart barr~l saving dart weight and materials and ac~ieving better flight characteristics.
It is a further object of the invention to moYe the centre Qf gravity of the dart more forward than .
those of simîlar ~Ibounceoresistant~l darts and closer o the front of the~d~rt barrel or body. This assists in better ~light characteristics for the dart since ~: th~ flight~of the dart:has a be~ter chance to migrate i~ the dart on~it~ steady path of~travel.
. : 25 ~ It i~ a ~urther object of the inv~ntion t,o provide that th~:dart body defines a cylindrical reGess~ and ~he dar~ point have its downs~ream end : e~sentially:cylindrical, adapt~d to frictionally travel, in a reciprocating ~ashion, within the ~: 30 :cylindrical r,~cess while allowing the dart point ~o have a taper, f or penetration purposes, at its forward or upstream end into a dartboa~d. The cylindrical izing of the downstream end of the dar~ poin~ a~d of the cy~indrical ravity is such that the cavity :stabili2~s the dart point in its radial directions so that the point is always, essentially, in the prolongation of the cylindrical axis of the body, ,, .,. ~
... .
W094/03~2 212 0 9 1~ PCT/CAg3/0~320 i.e., thR tip does not wobble.
~l~n~C_2E_THE INvE~TI QN
The invention achieves the retraction of the dart point on impact onto wires or staples fast~ned to a dartboard to eff~ctively minimize loss of darts due to "bounce out" when the dart point impacts the~
wires or metal staples that surmount the bristle ~ibre denominated region~ of the dartboard; the wires and staples act as boundaries to th~ denominated regions.
The inv~ntivn also achie~es retraction of t~
dart point, each time that the dart point itself s~rikes the fibrous denominated regions, or if first hit~ a boundary wîre, the point retraction allows the kinetic energy of the barrel to sustain pressure of the tip on the wire "encouraging" the tip to slîde off and to penetrate an adjac~nt den~minated region of the board, thus elimating "bounce-outl'.
The i~vention therefore achieves a dart comprising:
(a) a cylindrical ~ike body de~ining a ~tep bore that commu~icates with one end thereof, the other end carrying a flight; :
(b) ~ dart~point having a tapered ~ha~t portion that ter~inates:in a forward point, thè taper~d sha~t 2~ : at its opp3~ite end stepping through a shoulder into a cylindrical~e~ent;
:(c~ wherein the:step bore has a major and minor bore, the minor bore~sized slightly larger than the cylindricai portion af the dart point wher~by to allow frictional engagement therewith an~ to permit the dart ; point to travel~to and fro within said ~inor bore;
: and, (d~ a~split ~nn~lar sleeve sized to nest in said major bore, defining a cylindrical channel sized a diameter smaller than the minor bore, and having : rearward shoulders, whereby the tapered shaft portion of the dart point is adapted to extend through the W09~3242 P~T/~3/00320 2~2D914 sleeve and in its forward extension, to engage against the rear~ard shoulders of the sleeve urging the sl~eve in an outwardly radial direction against the inner diameter of the major ~ore to thereby constr~in the sleeve and the dart point in the body.
More particularly, the dart has a preferred cylindrical segment o~ length D that is approximately 20% of the total length of the dart point and the minor bore has a length greater than the distance D
wi~h a diameter fractionally larger than about 3mm which is the out~ide diameter of the cylindrical segment.
BRIEF DES~RIPTION OF THE DR~IMGS
The invention will now be described by way of example and with reference to the accompanying drawings in which:
Figure 1 is a perspective ~iew of the dart;
Figure 2 is of a partial sectional view of the point in th~ cylindriaal cavity de~ined by the dart : 20 body and showing ~he frictional int~rfac~ be~ween the -; ; no~el circu~scribing spIit s}eeve and the outer : ` shoulder ~f the dart poin~;
Figure 3: i5 a ~ide view, exaggerat~d, of the dart poi~t; ~ ~ ~
: :Figure 4 is ~ p~rspectiYe view of the novel : split:sl~eve.
Figure 5~;is~a~partial sectional view of a tool for~re~oval of the novel point system; and, Figure 6 is a perspacti~e ~iew of the tool of ~: 30 ~igure 5.
R~ferring to figure 1, the dart 10, according to : ~the invention, consis s of a cylîndrical-like body or : ~ barrel 11; which, in this figure, is shown as truncated:oblate ellipsoid 11, which has a forward 35~ ~: apertur~ 12 car~ying therein a novel split ring ~ollar 13 through which extends a retractable dart point 14 :having a forward or upstream point 15 for penetration _W094/03~2 2 1 2 0 ~ 1~ PCr/C~93/~0~20 into a dartboard or the like. The body 11 ext~nds rearwardly, and can be slightly tapering, into a shaft or stem 16 carrying flights 17.
Referring to figure 3, the dart point 14 has a tapered or conical shaft portion l9, that at its upstream end, tapers into a p~netrating point or tip 15. The downstream end of the conical taper 19 terminates at an annular shoulder 2~ but extends dow~stream into a cyli~drical shaft portion 20 that is dimensioned a di~tance, D, which represents approximately 20% of the total length of the dart point 14.
~eferring to the partial sectional view of figure 2, the body 11 terminates at a front annular face 31 that defines a step bore, a forward major bore 32 concentric with and stepping into a longer cylindrical minor ~ore 33. The minor bore 33 is sized ~lightly ! arger than the diameter of the cylindrical portion 20,~ which has preferably an outside diameter of approximately~3mm, of the dart poink 14 ~o as to : . allow the dart point 1~ to reciprocatingly travel in ~he minor bore 33~whose walls act as a be~ring ~urface a~ain the cylindrical portion 20 allowing . reciprocation~of:the dart point 14 to and fro, as will : 25 be described.~
: ~ ~ Referring:to~figures 2:~nd 4, the split sleeYe : 13 is in frictional en~agement wi~h the ~ajor ~ore 32.
: ~ Th~ split ~le~ve:13 defines a forward collar or . annulus 27 wi~h an inner shoulder 22 haYing~split , ::30 ~ ~emi-circular:cylindrical portions 23 with an outside ~:~ : . diameter 250 and~:an inside diam~ter 251, the latter of which is concentric with a bore 26 dePined by :
extending through the split slee~e 13. The outside diameter of the semi-cylindrical portions 23 3~ preferably shouId be of const~nt diameter.
~: In either ca~e, the outer diamet~r 25o îs : : slightly }arger than the inner diameter of the major `
.
W094/032~2 P~T/C~g3/003~0 21~91~
bore 32 so as to make a frictional sealing, engagemen~
therewith, while the inner diameter 2Sl is slightly smaller than the diameter at the annular shoulder 21 of the dart point 14, as shown in figur~s 2 and 3.
When the dart point 1~ is in its extended outward position of figures 1 and ~, that is al~o the operational dart-thr~wing position of the dart point 1~. The diameter of the cylindrical portion 20 of the dart point 14 is larger than diameter 25, ~o that when the dart point 14 is in its outward extended position, as aforesaid, a radial segment 19' of the tap~r~d portion 19 engages against the inner diameter 25l expanding the split ring radially outward so that its outer diameter 250 urges and fixes itself into the walls of the major bore 32' constraining not only the split slee~e 13 in the dart body ll but also, the dart point 14~
When the dart point 14 is retracted into the major bQre 33, as by i~pact ag~in~t the dartboard or the like, he outward urging by:the taper 19 against the inner perip~exaI diameter~25l o~ the split sleeve 13 no longer:exists. ~his removes:t~e outward diametriaa.l pressure on the di~tal end 25 o~ ~e sleeve 13 and~re~oves the frictional:engagement of the outer diameter 250 ~f th2 sleeve 13 ~gainst the inner diameter of the major bore 32.; Outward radial .~ ~ : pressure on~h~;sp~it æleeve 13:is relieved and it may be~remnved from the body o~ thè dart:by convenient tool 5Q, shown in figures 5 and 6, which all~ws easy remo~al of the:dart point system~from the barrel 11.
The:tool, to~ether with the profile ~ the cylindrical : . bore 33, the shape of the tip 14 , and the split sleeve 13 provide a co~venient means of removing a damaged dart point tip 15, if the sam~ is damaged as by falling on concrete floors or, some~imes, even : striking the boundary wires of the dart board.
Referring to figures 5 and 6, the removal tool W094/03242 2 1 2 0 9 1 4 PCr/~A93/00320 50 is but a ~ingle sh~!~t of formed metal having two arms 53 interconnected at their respective proximate ends by a curve or convex portion 54 and terminating at distal end 51, which provide a step bor~ at the inter~ace 51 and 52 so, when, and now referring to figure 5, the ~nds are depre~sed in the direction of the arrows koward each other in the direction ~f arrows A and the tool 50 is pulled in the direction of arrow D, and provided that ~he tapered portion lg of th~ tip 14 i~ free of the inner diameter 251 of t~
split sleeve 13, the split sleeve 13 may be removed from the barrel by pulling it in the direction D. If the length L is chosen correctly, and is slightly "less" than the total extent by which the point 14 protrudes, as shown in figures 1 and 2, from the barrel 11 when th~ taper 19 ur~es against the inner ~
circumference 25, of the sle~ve, the ~orward motion of ::
the tool/ in the direction opposite to that of arrow D, while it is in the process of being engaged over the slee~e 13, will:put pressure, by the concave .
portion 54 on the tip l5, and pu~h the point 14 into the barrel ll:reli~ving the outward radial pressure of the tapered portion 19 on the 61eeve portions 25~. .
-,, .-' ~
This invention relates to darts, as used in a game of skill, now uni~ersally known and played around the world as both a leisure and as a competitive sport or game.
BACKGROUND ~O THF._IN OE NTION
, ~ prior art device is disclosed in a U~S~A.
,, patent issued 6 October, 1987 as Patent No. 4,697,815to one ~cKenna for a ~A~T. That particular patent d~scribes a tapered point which is seized, in its . forward and extended position, by a collar which has a thread to matingly thread into a threaded portion in a cylindrical-like cavity defined by the dart body. The machining of the threaded collar and female mating thread in the body is exp~nsive; furthermore, the construction of a fully tapered point, with the butt end t iS ~lso expen~i~e. Another dart with retractable j point is disclosed by Bott~esen in his U.S.A. Patent `~ No. 4,230,322 issued 28 Qctober, 1980.
It~is an object of the invention to eliminate ~ such threads and~as 8ubstitution to provide a split ;~ ~ sle~ve in frictional engagement with a step bore : defined by:the dart body as means for retaining the point in the dart body, during f~ight, while allowing the point to~reciprocatin~ly travel within the dart ~,: : body and,~when it îs in the dart point outwardly ;extended~position, o lock agains~ the split sleeve so as to lock~it in outward engagemen~. When the dart : :point hits~ a denomina~ed dartboard region, it : 30 penetrates it;`while,~if the ~artpoint~hi~s a ~oundary~
wire surmounted~on the dart~board partitioning two denominated~regions, the kinetic energy o~ the dart body causes he downstream end of the dart point to : : migrate into the cylîndrical cavity defined by the dart body~while appIying a constant pressure, during ;.
~: this migration, on the dart point due to ~he momentum of the dart point against the wire, encouraging the ..
i ~ .
., ;
, ~094/03~2 : P~Tt~93/~0320 2120~14 `:
point to ~ravel over the wire and thus, to penetrate into a denominated region of the dartboard; this re~ucing l'bounce-out". I
In a similar fashion, when a dart is flung, it impacts a denomi~ated reyion directl~, the a~oresaid action still ~liminates ~Ibounce-ou~l~ should the point tip be dull or otherwise damaged.
The primary object of the invention ~o accomplish the afore~aid with, simplicity, enhancing manufacturi~g ef~iciency, by way of the construction of a less expensive product which eliminates threads and the like or, other machining means, adapted to constrain the point in a forward position.
It is another object of the invention to allow or enable the reduction in diametrical size of the dart body or dart barr~l saving dart weight and materials and ac~ieving better flight characteristics.
It is a further object of the invention to moYe the centre Qf gravity of the dart more forward than .
those of simîlar ~Ibounceoresistant~l darts and closer o the front of the~d~rt barrel or body. This assists in better ~light characteristics for the dart since ~: th~ flight~of the dart:has a be~ter chance to migrate i~ the dart on~it~ steady path of~travel.
. : 25 ~ It i~ a ~urther object of the inv~ntion t,o provide that th~:dart body defines a cylindrical reGess~ and ~he dar~ point have its downs~ream end : e~sentially:cylindrical, adapt~d to frictionally travel, in a reciprocating ~ashion, within the ~: 30 :cylindrical r,~cess while allowing the dart point ~o have a taper, f or penetration purposes, at its forward or upstream end into a dartboa~d. The cylindrical izing of the downstream end of the dar~ poin~ a~d of the cy~indrical ravity is such that the cavity :stabili2~s the dart point in its radial directions so that the point is always, essentially, in the prolongation of the cylindrical axis of the body, ,, .,. ~
... .
W094/03~2 212 0 9 1~ PCT/CAg3/0~320 i.e., thR tip does not wobble.
~l~n~C_2E_THE INvE~TI QN
The invention achieves the retraction of the dart point on impact onto wires or staples fast~ned to a dartboard to eff~ctively minimize loss of darts due to "bounce out" when the dart point impacts the~
wires or metal staples that surmount the bristle ~ibre denominated region~ of the dartboard; the wires and staples act as boundaries to th~ denominated regions.
The inv~ntivn also achie~es retraction of t~
dart point, each time that the dart point itself s~rikes the fibrous denominated regions, or if first hit~ a boundary wîre, the point retraction allows the kinetic energy of the barrel to sustain pressure of the tip on the wire "encouraging" the tip to slîde off and to penetrate an adjac~nt den~minated region of the board, thus elimating "bounce-outl'.
The i~vention therefore achieves a dart comprising:
(a) a cylindrical ~ike body de~ining a ~tep bore that commu~icates with one end thereof, the other end carrying a flight; :
(b) ~ dart~point having a tapered ~ha~t portion that ter~inates:in a forward point, thè taper~d sha~t 2~ : at its opp3~ite end stepping through a shoulder into a cylindrical~e~ent;
:(c~ wherein the:step bore has a major and minor bore, the minor bore~sized slightly larger than the cylindricai portion af the dart point wher~by to allow frictional engagement therewith an~ to permit the dart ; point to travel~to and fro within said ~inor bore;
: and, (d~ a~split ~nn~lar sleeve sized to nest in said major bore, defining a cylindrical channel sized a diameter smaller than the minor bore, and having : rearward shoulders, whereby the tapered shaft portion of the dart point is adapted to extend through the W09~3242 P~T/~3/00320 2~2D914 sleeve and in its forward extension, to engage against the rear~ard shoulders of the sleeve urging the sl~eve in an outwardly radial direction against the inner diameter of the major ~ore to thereby constr~in the sleeve and the dart point in the body.
More particularly, the dart has a preferred cylindrical segment o~ length D that is approximately 20% of the total length of the dart point and the minor bore has a length greater than the distance D
wi~h a diameter fractionally larger than about 3mm which is the out~ide diameter of the cylindrical segment.
BRIEF DES~RIPTION OF THE DR~IMGS
The invention will now be described by way of example and with reference to the accompanying drawings in which:
Figure 1 is a perspective ~iew of the dart;
Figure 2 is of a partial sectional view of the point in th~ cylindriaal cavity de~ined by the dart : 20 body and showing ~he frictional int~rfac~ be~ween the -; ; no~el circu~scribing spIit s}eeve and the outer : ` shoulder ~f the dart poin~;
Figure 3: i5 a ~ide view, exaggerat~d, of the dart poi~t; ~ ~ ~
: :Figure 4 is ~ p~rspectiYe view of the novel : split:sl~eve.
Figure 5~;is~a~partial sectional view of a tool for~re~oval of the novel point system; and, Figure 6 is a perspacti~e ~iew of the tool of ~: 30 ~igure 5.
R~ferring to figure 1, the dart 10, according to : ~the invention, consis s of a cylîndrical-like body or : ~ barrel 11; which, in this figure, is shown as truncated:oblate ellipsoid 11, which has a forward 35~ ~: apertur~ 12 car~ying therein a novel split ring ~ollar 13 through which extends a retractable dart point 14 :having a forward or upstream point 15 for penetration _W094/03~2 2 1 2 0 ~ 1~ PCr/C~93/~0~20 into a dartboard or the like. The body 11 ext~nds rearwardly, and can be slightly tapering, into a shaft or stem 16 carrying flights 17.
Referring to figure 3, the dart point 14 has a tapered or conical shaft portion l9, that at its upstream end, tapers into a p~netrating point or tip 15. The downstream end of the conical taper 19 terminates at an annular shoulder 2~ but extends dow~stream into a cyli~drical shaft portion 20 that is dimensioned a di~tance, D, which represents approximately 20% of the total length of the dart point 14.
~eferring to the partial sectional view of figure 2, the body 11 terminates at a front annular face 31 that defines a step bore, a forward major bore 32 concentric with and stepping into a longer cylindrical minor ~ore 33. The minor bore 33 is sized ~lightly ! arger than the diameter of the cylindrical portion 20,~ which has preferably an outside diameter of approximately~3mm, of the dart poink 14 ~o as to : . allow the dart point 1~ to reciprocatingly travel in ~he minor bore 33~whose walls act as a be~ring ~urface a~ain the cylindrical portion 20 allowing . reciprocation~of:the dart point 14 to and fro, as will : 25 be described.~
: ~ ~ Referring:to~figures 2:~nd 4, the split sleeYe : 13 is in frictional en~agement wi~h the ~ajor ~ore 32.
: ~ Th~ split ~le~ve:13 defines a forward collar or . annulus 27 wi~h an inner shoulder 22 haYing~split , ::30 ~ ~emi-circular:cylindrical portions 23 with an outside ~:~ : . diameter 250 and~:an inside diam~ter 251, the latter of which is concentric with a bore 26 dePined by :
extending through the split slee~e 13. The outside diameter of the semi-cylindrical portions 23 3~ preferably shouId be of const~nt diameter.
~: In either ca~e, the outer diamet~r 25o îs : : slightly }arger than the inner diameter of the major `
.
W094/032~2 P~T/C~g3/003~0 21~91~
bore 32 so as to make a frictional sealing, engagemen~
therewith, while the inner diameter 2Sl is slightly smaller than the diameter at the annular shoulder 21 of the dart point 14, as shown in figur~s 2 and 3.
When the dart point 1~ is in its extended outward position of figures 1 and ~, that is al~o the operational dart-thr~wing position of the dart point 1~. The diameter of the cylindrical portion 20 of the dart point 14 is larger than diameter 25, ~o that when the dart point 14 is in its outward extended position, as aforesaid, a radial segment 19' of the tap~r~d portion 19 engages against the inner diameter 25l expanding the split ring radially outward so that its outer diameter 250 urges and fixes itself into the walls of the major bore 32' constraining not only the split slee~e 13 in the dart body ll but also, the dart point 14~
When the dart point 14 is retracted into the major bQre 33, as by i~pact ag~in~t the dartboard or the like, he outward urging by:the taper 19 against the inner perip~exaI diameter~25l o~ the split sleeve 13 no longer:exists. ~his removes:t~e outward diametriaa.l pressure on the di~tal end 25 o~ ~e sleeve 13 and~re~oves the frictional:engagement of the outer diameter 250 ~f th2 sleeve 13 ~gainst the inner diameter of the major bore 32.; Outward radial .~ ~ : pressure on~h~;sp~it æleeve 13:is relieved and it may be~remnved from the body o~ thè dart:by convenient tool 5Q, shown in figures 5 and 6, which all~ws easy remo~al of the:dart point system~from the barrel 11.
The:tool, to~ether with the profile ~ the cylindrical : . bore 33, the shape of the tip 14 , and the split sleeve 13 provide a co~venient means of removing a damaged dart point tip 15, if the sam~ is damaged as by falling on concrete floors or, some~imes, even : striking the boundary wires of the dart board.
Referring to figures 5 and 6, the removal tool W094/03242 2 1 2 0 9 1 4 PCr/~A93/00320 50 is but a ~ingle sh~!~t of formed metal having two arms 53 interconnected at their respective proximate ends by a curve or convex portion 54 and terminating at distal end 51, which provide a step bor~ at the inter~ace 51 and 52 so, when, and now referring to figure 5, the ~nds are depre~sed in the direction of the arrows koward each other in the direction ~f arrows A and the tool 50 is pulled in the direction of arrow D, and provided that ~he tapered portion lg of th~ tip 14 i~ free of the inner diameter 251 of t~
split sleeve 13, the split sleeve 13 may be removed from the barrel by pulling it in the direction D. If the length L is chosen correctly, and is slightly "less" than the total extent by which the point 14 protrudes, as shown in figures 1 and 2, from the barrel 11 when th~ taper 19 ur~es against the inner ~
circumference 25, of the sle~ve, the ~orward motion of ::
the tool/ in the direction opposite to that of arrow D, while it is in the process of being engaged over the slee~e 13, will:put pressure, by the concave .
portion 54 on the tip l5, and pu~h the point 14 into the barrel ll:reli~ving the outward radial pressure of the tapered portion 19 on the 61eeve portions 25~. .
-,, .-' ~
Claims (4)
1. A dart comprising:
(a) a cylindrical-like body with opposite ends, the body defining a stepped inner major and minor bores that mutually communicate with one another, the major bore communicating to one end of the body, the other end carrying a flight;
(b) a dart point having a tapered shaft portion that terminates in a forward point, the tapered shaft at its opposite end stepping through a shoulder into a cylindrical segment;
(c) the minor bore sized slightly larger than the cylindrical portion of the dart point;
(d) characterized-to allow frictional engagement therewith and to permit the dart point cylindrical segment travel to and fro, in close sliding juxtaposition and within said minor bore; and, (e) a split annular sleeve sized to nest in said major bore, defining a cylindrical channel sized a diameter smaller than the minor bore, and cylindrical segment and having rearward shoulders, whereby a major extent of the tapered shaft portion of the dart point is adapted to extend through and beyond the sleeve and which, in its forward extension, a circumferential segment of the tapered shaft portion is adapted to engage against the rearward shoulders of the sleeve urging the sleeve in an outwardly radial direction against the inner diameter of the major bore thereby constrain the sleeve and the dart point in the body.
(a) a cylindrical-like body with opposite ends, the body defining a stepped inner major and minor bores that mutually communicate with one another, the major bore communicating to one end of the body, the other end carrying a flight;
(b) a dart point having a tapered shaft portion that terminates in a forward point, the tapered shaft at its opposite end stepping through a shoulder into a cylindrical segment;
(c) the minor bore sized slightly larger than the cylindrical portion of the dart point;
(d) characterized-to allow frictional engagement therewith and to permit the dart point cylindrical segment travel to and fro, in close sliding juxtaposition and within said minor bore; and, (e) a split annular sleeve sized to nest in said major bore, defining a cylindrical channel sized a diameter smaller than the minor bore, and cylindrical segment and having rearward shoulders, whereby a major extent of the tapered shaft portion of the dart point is adapted to extend through and beyond the sleeve and which, in its forward extension, a circumferential segment of the tapered shaft portion is adapted to engage against the rearward shoulders of the sleeve urging the sleeve in an outwardly radial direction against the inner diameter of the major bore thereby constrain the sleeve and the dart point in the body.
2. The dart, as claimed in claim 1, characterized in that the cylindrical segment has a length D that is approximately 20% of the total length of the dart point.
3. The dart, as claimed in claim 2, characterized in that the minor bore has a length greater than distance D.
4. The dart, as claimed in claim 3, characterized in that the diameter of the cylindrical segment is approximately 3mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/296,934 | 1992-08-10 | ||
| US07/926,934 US5248151A (en) | 1992-08-10 | 1992-08-10 | Retractable point system for a dart |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2120914A1 true CA2120914A1 (en) | 1994-02-17 |
Family
ID=25453912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002120914A Abandoned CA2120914A1 (en) | 1992-08-10 | 1993-08-05 | Retractable point system for a dart |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5248151A (en) |
| AU (1) | AU4694893A (en) |
| CA (1) | CA2120914A1 (en) |
| GB (1) | GB2277697B (en) |
| WO (1) | WO1994003242A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2296450A (en) * | 1994-12-13 | 1996-07-03 | Brackla Eng Co Ltd | A dart |
| US5611543A (en) * | 1995-05-16 | 1997-03-18 | Bottelsen; Walter E. | No bounce dart with rotatable barrel |
| TW408619U (en) * | 1995-07-11 | 2000-10-11 | Unicorn Products Ltd | Darts for the game og darts |
| US5603506A (en) * | 1996-04-12 | 1997-02-18 | Pickup; Jeffrey | Removable and retractable point system for a dart |
| US5707307A (en) * | 1996-06-26 | 1998-01-13 | Robben; Carlos | Business/pleasure dart |
| GB9715554D0 (en) * | 1997-07-23 | 1997-10-01 | Winmau Dartboard Ltd | A dart |
| US7677302B2 (en) * | 2007-01-11 | 2010-03-16 | Halliburton Energy Services, Inc. | Spoolable connector |
| US7648179B2 (en) * | 2007-01-17 | 2010-01-19 | Halliburton Energy Services, Inc. | Connector having offset radius grooves |
| CN107198585B (en) * | 2017-06-01 | 2023-06-09 | 成都贝施美生物科技有限公司 | Implant acid etching tool device |
| DE202021101319U1 (en) * | 2021-03-16 | 2021-04-28 | Didier Krampfl | Dart tip clamping system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4230322A (en) * | 1979-01-22 | 1980-10-28 | Bottelsen Walter E | No bounce dart |
| US4596393A (en) * | 1985-10-21 | 1986-06-24 | Mihkel Orav | Anti-bounce-back dart |
| US4697815A (en) * | 1986-07-25 | 1987-10-06 | 139316 Canada Inc | Dart |
| CA2009762A1 (en) * | 1989-02-17 | 1990-08-17 | Walter E. Bottelsen | No bounce dart |
-
1992
- 1992-08-10 US US07/926,934 patent/US5248151A/en not_active Expired - Fee Related
-
1993
- 1993-08-05 AU AU46948/93A patent/AU4694893A/en not_active Abandoned
- 1993-08-05 CA CA002120914A patent/CA2120914A1/en not_active Abandoned
- 1993-08-05 WO PCT/CA1993/000320 patent/WO1994003242A1/en active Application Filing
- 1993-08-05 GB GB9405912A patent/GB2277697B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB9405912D0 (en) | 1994-06-08 |
| US5248151A (en) | 1993-09-28 |
| AU4694893A (en) | 1994-03-03 |
| GB2277697B (en) | 1995-12-06 |
| WO1994003242A1 (en) | 1994-02-17 |
| GB2277697A (en) | 1994-11-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |