CA1069112A - Striking bar - Google Patents
Striking barInfo
- Publication number
- CA1069112A CA1069112A CA286,551A CA286551A CA1069112A CA 1069112 A CA1069112 A CA 1069112A CA 286551 A CA286551 A CA 286551A CA 1069112 A CA1069112 A CA 1069112A
- Authority
- CA
- Canada
- Prior art keywords
- working member
- striking bar
- support
- bearing
- portions
- 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.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/03—Couplings; joints between drilling rod or pipe and drill motor or surface drive, e.g. between drilling rod and hammer
Abstract
ABSTRACT
This invention relates to improvements in working member assemblies and is described hereinbelow with particular reference to a novel striking bar assembly for use in open front type rock drills.
This invention relates to improvements in working member assemblies and is described hereinbelow with particular reference to a novel striking bar assembly for use in open front type rock drills.
Description
~06911Z
Prior rock drills have commonly been provided with a striking bar assembly including an elongated striking bar which is retained within and extends outwardly of the forward end of the drill for actuation in one or more drilling modes - such as simultaneous percussive and rotary actuation to drill ~ a bore hole by means of an elongated drill string secured to the ,~"~ free end of the striking bar. Such prior drills generally may . . , be classified as open front end drills if the structure of the striking bar retention means therein permits removal or insertion of the striking bar without any drill disassembly.
Examples of known open front drills are the lug types wherein lugs formed intermediate the ends of the striking bar cooperate , with groove means in the drill chuck to secure the striking bar in the manner of a bayonet lock, and the latching type-wherein , a latch member is carried adjacent the forward end of the drill to secure the striking bar by engaging a peripheral portion thereof.
.;...................... .
Although heretofore known striking bar assemblies for open front type drills have generally served the intended purposes, they have nevertheless often been subject to serious deficiencies. For example, in many open front drills striking - bar removal and replacement requires the striking bar to be ; passed axially through the bearing portion of the forward bushing, and the maximum striking bar diameter thus has often been limited to the internal bearing diameter of the forward - bushing. In such cases it has been impossible to provide a striking bar with a desirably enlarged rearward end portion. -~
Other striking bar design considerations arising from the ~; requirement for compatibility with open front drills have seriously limited the available design options for striking bar lubrication, venting and rotary driving in such drills.
, .
,,,," ~
., ~ .
.. .
` 1~6911Z
These and other deficiencies of the prior art are alleviated by the present invention which in a specific form provides a novel striking bar assembly for an open front end type drill wherein the striking bar includes an enlarged rear-ward end portion and enlarged intermediate driver portion, both of which are ab~e to be passed axially through a forward support bushing having a bearing surface diameter smaller than the nominal diameter of either such rearward end portion or driver portion. The novel striking bar assembly of this invention ~
additionally provides improved venting and lubrication through ~ -axially extending passageway means formed in the enlarged diameter rearward end portion thereof.
The present invention is defined as a working member assembly in an impact tool means comprising: an elongated working member having at least a pair of axially aligned support portions and a rotary driver portion; elongated bearing means adapted to be carried by such impact tool means and cooperable with the working member to supportingly engage the support portions of the working member; the bearing means including a pair of bearing portions with each of the bearing portions being formed to supportingly encompass a respective one of the pair of support portions for support of the working member in a manner to permit rotation thereof with respect to the bearing portions; and one of the support portions of the working member having a transverse extent greater than the transverse extent of the other of the support portions and being cooperable with the bearing portion which supportingly encompasses the other support portion to be movable axially therethrough for removal and insertion of the working member from and into the bearing means.
These and other features of the invention are more fully specified in the following description of the invention .. .. . . ~ ~ .
.
~;9~
with reference to the accompanying figures in which:
Fig. 1 is a central axial section of a rock drill forward end portion including a striking bar assembly according to one embodiment of the instant invention;
Fig. 2 is a fragmentary transverse section of the drill of Fig. 1 taken on line 2--2 of Fig. 1 and showing the striking bar assembly in the open or nonretained state;
Fig. 3 is a transverse section similar to Fig. 2 with portions broken away to show the striking bar assembly in the closed or retained state; and Fig. 4 is a fragmentary transverse section of Fig. 1 taken on line 4--4 of Fig. 1.
There is generally indicated at 10 in Fig. 1 the forward end portion of a powered actuator or tool means, shown as a percussive rock drill and including a yoke portion 13 which carries therewithin an elongated generally cylindrical striking bar 34 retained within yoke portion 13 by means generally indicated at 12 and more completely described and claimed in U.S. Patent No. 4,106,573 issued on August 15, 1978 to E.A.
Bailey entitled "Drill" which is assigned to the same assignee as the instant application.
Yoke 13 comprises an elongated, generally cylindrical housing 14 rigidly secured coaxially intermediate a generally annular front cap 16 and an elongated percussion portion 18 (forward end only shown) by any suitable means for example, a plurality of longitudinally extending conventional side rods (not shown) secured by threaded fasteners 19.
In operation a hammer piston 17 suitably reciprocably carried within portion 18 is actuated to repetitively impact the rearward end of striking bar 34 simultaneously with independent axial rotation of striking bar 34 by means described _ ~_ la6sllz hereinbelow to provide a rotary, percussive drilling action for drilling bore holes in hard formations such as rock.
Striking bar 34 is supported coaxially within an elongated ~nnalar chuck ., ~' ' ,' ; ~ - 4a -`
~, . .. .
.
`'` 1069112 "
member 20 which, in turn, is rotatably journaled within housing 14 by axially spaced, annular roller bearing assemblie,s 22 for rotation by any suitable drive means such as an annular motor means 21 and planetary gear train 23 which are more fully described in U.S. Patent No. 3,858,666.
Member 20 incLudes a stepped cylindrical inner periphery 25 wherein a generally annular rear chuck bushing 24 is press-fitted coaxially ad~acent the rearward end thereof.
An elongated annular chuck driver 28 is similarly press fitted 10~ within periphery 25 coaxially forwardly adjacent bushing 24 f ' and additionally i8 nonrotatably keyed to chuck member 20 ' ; ~ for rotary driving thereby as by respective pluralities of intermeshed splines 30 spaced circumferentially about ad~acent 3: :
peripheral portions of driver 28 and member 20. A generally annular elongated~forward bushing or bearing member 26 is loc-ted coaxially~forwardly; ad~acent driver 28 such that a rear-ward end portion~26A thereof ls engaged in rotary driving eogagement within~the forward end of chuck inner periphery 25 and a~forward end portion 26B thereof is rotatably supported 20 ~ within;~a cylindrical inner periphery 11 of cap 16. Cap 16, when~assembled to housing 14, cap~tively retains chuck member 20 and béarings 22 within bousing 14 with bushing 24 and driver 28 '.
carried therewithin~as described. Cap 16 additionally captively rètains bushing 26 coaxially intermediate a rearwardly facing annular thrust bearing surface 29 thereof and driver 28.
The coaxially aligned inner peripheries of rear bushing 24, driver 28 and forward bushing 26 are sized to receive striking bar 34 therewithin with axially aligned rear-- ward and forward striking bar portions 34A, 34C rotatably ~30~ supported within respective bushings 24, 26. An enlarged ~, ~ ~ , --:` '` 106911Z
striking bar portion 34B axially intermediate portions 34A, ' 34C includes a plurality of circumferentially spaced, radiallyoutward extending drive splines 36 which are engaged in rotary i driving engagement with cooperably formed splines 38 spaced i~
circumferentially about the inner periphery of driver 28 whereby striking bar 34 may be driven in axial rotation by motor 21. ~ ~ -In order to permit removal and insertion of striking bar 34 in yoke portion 13 without disassembly of cap ~6 from the drill, all portions of the striking bar 34 located within yoke portion 13 are able to pass axiaIly through bushing 26. Accord- ,s~
ingly, the inner periphery of bushing 26 includes a radially inner, circumferentially segmented bearing surface means S2 ~-which rotatably supports formed striking bar portion 34C, and a ~- ~ plurality of circumferentially spaced, axially extending grooves 40 (Figs. l and 2) sized and located to receive splines 36 such that when the spline~ 36 are circumferentially aligned with~grooves 40 as in Fig. 2 striking~bar 34 may be passed xially through bushing 26 a8 desired. When splines 36 are circumferentially misaligned with grooves 40 (Fig. 3) str~king 20~ ~ bar 34 is retained within chuck portion 13 by abutment of a for-ward axial end 36A of splines 36 upon circumferentially spaced ; rearward end surface portions 42 of bushing 26 formed cir-cumferentially ineermediate grooves 40.
,, , . :
Bushing 26 rearward end portion 26A is keyed in '~
rotary driving engagement with chuck member 20 by respective cooperative pluralities of circumferentially spaced splines 44 and 46 (Figs. l, 2 and 3) to be driven in axial rotation at the same rotary speed as striking bar 34. As shown in Fig. 2, the circumferential spacing "S" between adjacent splines 46 is approximately twice the width "W" of splines 44 and the ,.. - . . . . - . . .
. . . ,, . . - ..................... . .. ~ ,-.. . . . . . . . ..
; ` "' :
resulting lost motion rotary connection therebetween permits sufficient rel~tive axial rotation between bushing 26 and striking bar 34 to provide the desired alignment and misalign-ment of grooves 40 and splines 36 as described in the hereinabove referenced U.S. Patent . . ;
Like the striking bar driver portion 34B, end portion 34A is of a larger nominal diameter than inner periphery 52 of bushing 26 through which striking bar 34 is passed during removal and replacement thereof. More specifically, rearward end portion 34A is of larger nominal diameter than the forward end portion 34C by virtue of having a plurality of circumferentially spaced, axially extending lands 54 (Fig. 1 and 4) aligned with ones of splines 36, and intervening, axially extending undercut grooves ; 56, the diameter across which grooves 56 is substantially the same as or smaller than the diameter of forward end portion 34C. 1 ;
The nominal outer diameter of rearward end portion 34A as de- - -fined by the diameter across lands 54 thus is larger than the diameter of bearing surface 52 in bushing 26. During striking bar removal and replacement the lands 54, which are aligned with ones of splines 36, register with respective grooves 40 and therefore do not interfere with smaller diameter bearing surface portions 52. Likewise, grooves 56, being of the same or smaller diameter than portion 34C, pass through forward bushing 26 in register with bearing surface portion 52 whereby the entire striking bar 34 including enlarged diameter rear-ward end portion 34A is able to be passed axially through forward bushing 26.
The described striking bar assembly affords numerous advantages not available heretofore in open front drills. For example, throughout the axial engagement of portion 34A within ~ rear bushing 24, the grooves 56 cooperate with the bearing I -; surface area 53 of bushing 24 to provide axially extending clearance spaces 58 circumferentially intermediate adjacent lands 54 through which otherwise isolated regions such as at 60 adjacent the impact end of piston 17 (Fig. 1) may be ~
vented to the atmosphere to preclude fluid pressure accumulationi~ l -therein. Clearance spaces 58 additionally may be used to conduct lubricant, perhaps in the form of an air-oil mist, to ~ -~ ; lubricate wear surfaces in yoke portion 13. Furthermore, the ,~ I0~ striking bar rearward end portion 34A is not limited to the standardized nominal diameter of the forward end portion 34C
which is determined in part by the dimensions of commercially '~ -available drill steels and couplings. The enlarged nominal diameter of portion 34A provides added material mass and strength which is highly desirable to better sustain the impact blo~ws of piston 17, particularly in view of such known mass and strength teficiencies as resulting from an enlarged coaxial bo* (not shown) commonly formed in the striking bar rearward end to receive a flushing fluid tube.
20 ~ According the the description hereinabove the present l;
invention provides a novel striking bar assembly particularly well~suited for use in an open front rock drill wherein a ' -rearward end bearing portion and an intermediate driver portion ~ -of the striking bar forward end portion, are able to be passed through a forward bushing which rotatably supports such forward ;;~ .
5; ~ ~ ~ end portion. Notwithstanding the description hereinabove of a particular preferred embodiment of the invention it is to be ; uhderstood that this invention may be practiced in numerous alternative embodiments with various modifications thereto without departing from the broad spirit and scope thereof.
, , :
- .' ' :, .. : ' . . . : :' . ' .
`" 106911Z
For example, various alternative configurations and numbers of the splines 36 on striking bar 34 may be employed; striking :
bar portions 34A, 34B and 34C are generally axially aligned but need not necessarily be coaxially aligned, various alternative striking bar securing and release means may be employed as well as alternative rotation motors and drill actuating means;
tbe particular configuration of rearward end portion 34A and of the inner periphery of bushing 26 may be varied within a wide design latitude;:and the like.
~10~These and other embodiments and modifications having been envisioned and anticipated by the inventors, the invention should be construed broadly and limited only by the scope of ~ , .
~ the claims appended hereto. ~ -J~
',~ : ~ ~, , ':
r ~
,, ~
~'~
;
_9_ ,
Prior rock drills have commonly been provided with a striking bar assembly including an elongated striking bar which is retained within and extends outwardly of the forward end of the drill for actuation in one or more drilling modes - such as simultaneous percussive and rotary actuation to drill ~ a bore hole by means of an elongated drill string secured to the ,~"~ free end of the striking bar. Such prior drills generally may . . , be classified as open front end drills if the structure of the striking bar retention means therein permits removal or insertion of the striking bar without any drill disassembly.
Examples of known open front drills are the lug types wherein lugs formed intermediate the ends of the striking bar cooperate , with groove means in the drill chuck to secure the striking bar in the manner of a bayonet lock, and the latching type-wherein , a latch member is carried adjacent the forward end of the drill to secure the striking bar by engaging a peripheral portion thereof.
.;...................... .
Although heretofore known striking bar assemblies for open front type drills have generally served the intended purposes, they have nevertheless often been subject to serious deficiencies. For example, in many open front drills striking - bar removal and replacement requires the striking bar to be ; passed axially through the bearing portion of the forward bushing, and the maximum striking bar diameter thus has often been limited to the internal bearing diameter of the forward - bushing. In such cases it has been impossible to provide a striking bar with a desirably enlarged rearward end portion. -~
Other striking bar design considerations arising from the ~; requirement for compatibility with open front drills have seriously limited the available design options for striking bar lubrication, venting and rotary driving in such drills.
, .
,,,," ~
., ~ .
.. .
` 1~6911Z
These and other deficiencies of the prior art are alleviated by the present invention which in a specific form provides a novel striking bar assembly for an open front end type drill wherein the striking bar includes an enlarged rear-ward end portion and enlarged intermediate driver portion, both of which are ab~e to be passed axially through a forward support bushing having a bearing surface diameter smaller than the nominal diameter of either such rearward end portion or driver portion. The novel striking bar assembly of this invention ~
additionally provides improved venting and lubrication through ~ -axially extending passageway means formed in the enlarged diameter rearward end portion thereof.
The present invention is defined as a working member assembly in an impact tool means comprising: an elongated working member having at least a pair of axially aligned support portions and a rotary driver portion; elongated bearing means adapted to be carried by such impact tool means and cooperable with the working member to supportingly engage the support portions of the working member; the bearing means including a pair of bearing portions with each of the bearing portions being formed to supportingly encompass a respective one of the pair of support portions for support of the working member in a manner to permit rotation thereof with respect to the bearing portions; and one of the support portions of the working member having a transverse extent greater than the transverse extent of the other of the support portions and being cooperable with the bearing portion which supportingly encompasses the other support portion to be movable axially therethrough for removal and insertion of the working member from and into the bearing means.
These and other features of the invention are more fully specified in the following description of the invention .. .. . . ~ ~ .
.
~;9~
with reference to the accompanying figures in which:
Fig. 1 is a central axial section of a rock drill forward end portion including a striking bar assembly according to one embodiment of the instant invention;
Fig. 2 is a fragmentary transverse section of the drill of Fig. 1 taken on line 2--2 of Fig. 1 and showing the striking bar assembly in the open or nonretained state;
Fig. 3 is a transverse section similar to Fig. 2 with portions broken away to show the striking bar assembly in the closed or retained state; and Fig. 4 is a fragmentary transverse section of Fig. 1 taken on line 4--4 of Fig. 1.
There is generally indicated at 10 in Fig. 1 the forward end portion of a powered actuator or tool means, shown as a percussive rock drill and including a yoke portion 13 which carries therewithin an elongated generally cylindrical striking bar 34 retained within yoke portion 13 by means generally indicated at 12 and more completely described and claimed in U.S. Patent No. 4,106,573 issued on August 15, 1978 to E.A.
Bailey entitled "Drill" which is assigned to the same assignee as the instant application.
Yoke 13 comprises an elongated, generally cylindrical housing 14 rigidly secured coaxially intermediate a generally annular front cap 16 and an elongated percussion portion 18 (forward end only shown) by any suitable means for example, a plurality of longitudinally extending conventional side rods (not shown) secured by threaded fasteners 19.
In operation a hammer piston 17 suitably reciprocably carried within portion 18 is actuated to repetitively impact the rearward end of striking bar 34 simultaneously with independent axial rotation of striking bar 34 by means described _ ~_ la6sllz hereinbelow to provide a rotary, percussive drilling action for drilling bore holes in hard formations such as rock.
Striking bar 34 is supported coaxially within an elongated ~nnalar chuck ., ~' ' ,' ; ~ - 4a -`
~, . .. .
.
`'` 1069112 "
member 20 which, in turn, is rotatably journaled within housing 14 by axially spaced, annular roller bearing assemblie,s 22 for rotation by any suitable drive means such as an annular motor means 21 and planetary gear train 23 which are more fully described in U.S. Patent No. 3,858,666.
Member 20 incLudes a stepped cylindrical inner periphery 25 wherein a generally annular rear chuck bushing 24 is press-fitted coaxially ad~acent the rearward end thereof.
An elongated annular chuck driver 28 is similarly press fitted 10~ within periphery 25 coaxially forwardly adjacent bushing 24 f ' and additionally i8 nonrotatably keyed to chuck member 20 ' ; ~ for rotary driving thereby as by respective pluralities of intermeshed splines 30 spaced circumferentially about ad~acent 3: :
peripheral portions of driver 28 and member 20. A generally annular elongated~forward bushing or bearing member 26 is loc-ted coaxially~forwardly; ad~acent driver 28 such that a rear-ward end portion~26A thereof ls engaged in rotary driving eogagement within~the forward end of chuck inner periphery 25 and a~forward end portion 26B thereof is rotatably supported 20 ~ within;~a cylindrical inner periphery 11 of cap 16. Cap 16, when~assembled to housing 14, cap~tively retains chuck member 20 and béarings 22 within bousing 14 with bushing 24 and driver 28 '.
carried therewithin~as described. Cap 16 additionally captively rètains bushing 26 coaxially intermediate a rearwardly facing annular thrust bearing surface 29 thereof and driver 28.
The coaxially aligned inner peripheries of rear bushing 24, driver 28 and forward bushing 26 are sized to receive striking bar 34 therewithin with axially aligned rear-- ward and forward striking bar portions 34A, 34C rotatably ~30~ supported within respective bushings 24, 26. An enlarged ~, ~ ~ , --:` '` 106911Z
striking bar portion 34B axially intermediate portions 34A, ' 34C includes a plurality of circumferentially spaced, radiallyoutward extending drive splines 36 which are engaged in rotary i driving engagement with cooperably formed splines 38 spaced i~
circumferentially about the inner periphery of driver 28 whereby striking bar 34 may be driven in axial rotation by motor 21. ~ ~ -In order to permit removal and insertion of striking bar 34 in yoke portion 13 without disassembly of cap ~6 from the drill, all portions of the striking bar 34 located within yoke portion 13 are able to pass axiaIly through bushing 26. Accord- ,s~
ingly, the inner periphery of bushing 26 includes a radially inner, circumferentially segmented bearing surface means S2 ~-which rotatably supports formed striking bar portion 34C, and a ~- ~ plurality of circumferentially spaced, axially extending grooves 40 (Figs. l and 2) sized and located to receive splines 36 such that when the spline~ 36 are circumferentially aligned with~grooves 40 as in Fig. 2 striking~bar 34 may be passed xially through bushing 26 a8 desired. When splines 36 are circumferentially misaligned with grooves 40 (Fig. 3) str~king 20~ ~ bar 34 is retained within chuck portion 13 by abutment of a for-ward axial end 36A of splines 36 upon circumferentially spaced ; rearward end surface portions 42 of bushing 26 formed cir-cumferentially ineermediate grooves 40.
,, , . :
Bushing 26 rearward end portion 26A is keyed in '~
rotary driving engagement with chuck member 20 by respective cooperative pluralities of circumferentially spaced splines 44 and 46 (Figs. l, 2 and 3) to be driven in axial rotation at the same rotary speed as striking bar 34. As shown in Fig. 2, the circumferential spacing "S" between adjacent splines 46 is approximately twice the width "W" of splines 44 and the ,.. - . . . . - . . .
. . . ,, . . - ..................... . .. ~ ,-.. . . . . . . . ..
; ` "' :
resulting lost motion rotary connection therebetween permits sufficient rel~tive axial rotation between bushing 26 and striking bar 34 to provide the desired alignment and misalign-ment of grooves 40 and splines 36 as described in the hereinabove referenced U.S. Patent . . ;
Like the striking bar driver portion 34B, end portion 34A is of a larger nominal diameter than inner periphery 52 of bushing 26 through which striking bar 34 is passed during removal and replacement thereof. More specifically, rearward end portion 34A is of larger nominal diameter than the forward end portion 34C by virtue of having a plurality of circumferentially spaced, axially extending lands 54 (Fig. 1 and 4) aligned with ones of splines 36, and intervening, axially extending undercut grooves ; 56, the diameter across which grooves 56 is substantially the same as or smaller than the diameter of forward end portion 34C. 1 ;
The nominal outer diameter of rearward end portion 34A as de- - -fined by the diameter across lands 54 thus is larger than the diameter of bearing surface 52 in bushing 26. During striking bar removal and replacement the lands 54, which are aligned with ones of splines 36, register with respective grooves 40 and therefore do not interfere with smaller diameter bearing surface portions 52. Likewise, grooves 56, being of the same or smaller diameter than portion 34C, pass through forward bushing 26 in register with bearing surface portion 52 whereby the entire striking bar 34 including enlarged diameter rear-ward end portion 34A is able to be passed axially through forward bushing 26.
The described striking bar assembly affords numerous advantages not available heretofore in open front drills. For example, throughout the axial engagement of portion 34A within ~ rear bushing 24, the grooves 56 cooperate with the bearing I -; surface area 53 of bushing 24 to provide axially extending clearance spaces 58 circumferentially intermediate adjacent lands 54 through which otherwise isolated regions such as at 60 adjacent the impact end of piston 17 (Fig. 1) may be ~
vented to the atmosphere to preclude fluid pressure accumulationi~ l -therein. Clearance spaces 58 additionally may be used to conduct lubricant, perhaps in the form of an air-oil mist, to ~ -~ ; lubricate wear surfaces in yoke portion 13. Furthermore, the ,~ I0~ striking bar rearward end portion 34A is not limited to the standardized nominal diameter of the forward end portion 34C
which is determined in part by the dimensions of commercially '~ -available drill steels and couplings. The enlarged nominal diameter of portion 34A provides added material mass and strength which is highly desirable to better sustain the impact blo~ws of piston 17, particularly in view of such known mass and strength teficiencies as resulting from an enlarged coaxial bo* (not shown) commonly formed in the striking bar rearward end to receive a flushing fluid tube.
20 ~ According the the description hereinabove the present l;
invention provides a novel striking bar assembly particularly well~suited for use in an open front rock drill wherein a ' -rearward end bearing portion and an intermediate driver portion ~ -of the striking bar forward end portion, are able to be passed through a forward bushing which rotatably supports such forward ;;~ .
5; ~ ~ ~ end portion. Notwithstanding the description hereinabove of a particular preferred embodiment of the invention it is to be ; uhderstood that this invention may be practiced in numerous alternative embodiments with various modifications thereto without departing from the broad spirit and scope thereof.
, , :
- .' ' :, .. : ' . . . : :' . ' .
`" 106911Z
For example, various alternative configurations and numbers of the splines 36 on striking bar 34 may be employed; striking :
bar portions 34A, 34B and 34C are generally axially aligned but need not necessarily be coaxially aligned, various alternative striking bar securing and release means may be employed as well as alternative rotation motors and drill actuating means;
tbe particular configuration of rearward end portion 34A and of the inner periphery of bushing 26 may be varied within a wide design latitude;:and the like.
~10~These and other embodiments and modifications having been envisioned and anticipated by the inventors, the invention should be construed broadly and limited only by the scope of ~ , .
~ the claims appended hereto. ~ -J~
',~ : ~ ~, , ':
r ~
,, ~
~'~
;
_9_ ,
Claims (12)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In an impact tool means, a working member assembly comprising:
an elongated working member having at least a pair of axially aligned support portions and a rotary driver portion;
elongated bearing means adapted to be carried by such impact tool means and cooperable with said working member to supportingly engage said support portions of said working member;
said bearing means including a pair of bearing portions with each of said bearing portions being formed to supportingly encompass a respective one of said pair of support portions for support of said working member in a manner to permit rotation thereof with respect to said bearing portions;
and one of said support portions of said working member having a transverse extent greater than the transverse extent of the other of said support portions and being cooperable with the said bearing portion which supportingly encompasses said other support portion to be movable axially therethrough for removal ant insertion of said working member from and into said bearing means.
an elongated working member having at least a pair of axially aligned support portions and a rotary driver portion;
elongated bearing means adapted to be carried by such impact tool means and cooperable with said working member to supportingly engage said support portions of said working member;
said bearing means including a pair of bearing portions with each of said bearing portions being formed to supportingly encompass a respective one of said pair of support portions for support of said working member in a manner to permit rotation thereof with respect to said bearing portions;
and one of said support portions of said working member having a transverse extent greater than the transverse extent of the other of said support portions and being cooperable with the said bearing portion which supportingly encompasses said other support portion to be movable axially therethrough for removal ant insertion of said working member from and into said bearing means.
2. A working member assembly as claimed in claim 1 wherein said rotary driver portion includes a transverse extent thereof which is greater than the transverse extent of said other support portion; ant said rotary driver portion being cooperable with the said bearing portion which supports said other support portion to be movable axially therethrough for removal and insertion of said working member from and into said bearing means.
3. A working member assembly as claimed in claim 2 wherein said support portions are generally cylindrical and said one support portion has a diameter larger than the diameter of said other support portion.
4. A working member assembly as claimed in claim 2 wherein said rotary driver portion includes a plurality of circum-ferentially spaced splines and said splines include a transverse extent which is greater than said transverse extent of said other support portion.
5. A working member assembly as claimed in claim 3 wherein said bearing portions include generally cylindrical bearing surface areas engageable with the respective said support portions to axially rotatably support said working member for rotation with respect to said bearing means.
6. A working member assembly as claimed in claim 5 wherein said one support portion includes a plurality of circum-ferentially spaced support lands and intervening grooves and the diameter of said one support portion is the outer diameter of said lands.
7. A working member assembly as claimed in claim 6, wherein said cylindrical bearing surface area engaging said other support portion is of a diameter smaller than said diameter of said one support portion.
8. In an elongated striking bar for use in an open-ended impact tool and including at least a pair of axially spaced apart support portions and a rotary driver portion, and wherein said striking bar is adapted to be supported with respect to such impact tool by insertion of said striking bar into the open end of such impact tool such that at least said pair of support portions engage a respective pair of bearing means carried by such impact tool, the improvement comprising:
one of said support portions of said striking bar being adapted to be received, during such insertion of said striking bar into such impact tool, into supporting engagement with one of such bearing means for rotation with respect thereto after being passed through an interior space defined and encompassed by the other of such bearing means, and said one support portion of said striking bar having a transverse extent greater than the maximum transverse extent of the other of said support portions.
one of said support portions of said striking bar being adapted to be received, during such insertion of said striking bar into such impact tool, into supporting engagement with one of such bearing means for rotation with respect thereto after being passed through an interior space defined and encompassed by the other of such bearing means, and said one support portion of said striking bar having a transverse extent greater than the maximum transverse extent of the other of said support portions.
9. A striking bar as claimed in claim 8 wherein said rotary driver portion is located axially intermediate said pair of support portions.
10. A striking bar as claimed in claim 8 wherein said support portions include generally cylindrical means co-axial with respect to the axis of said striking bar and said transverse extent of each of said support portions is the outer diameter of said generally cylindrical means.
11. A striking bar as claimed in claim 10 wherein said one support portion includes a plurality of circumferen-tially spaced, radially outwardly projecting lands.
12. A striking bar as claimed in claim 8 wherein said other support portion is adapted to be received into supporting engagement with said other bearing means for rotation with respect thereto.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA286,551A CA1069112A (en) | 1976-09-13 | 1977-09-12 | Striking bar |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US72292076A | 1976-09-13 | 1976-09-13 | |
| CA286,551A CA1069112A (en) | 1976-09-13 | 1977-09-12 | Striking bar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1069112A true CA1069112A (en) | 1980-01-01 |
Family
ID=24903984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA286,551A Expired CA1069112A (en) | 1976-09-13 | 1977-09-12 | Striking bar |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1069112A (en) |
| SE (1) | SE430351B (en) |
| ZA (1) | ZA775326B (en) |
-
1977
- 1977-09-02 ZA ZA00775326A patent/ZA775326B/en unknown
- 1977-09-06 SE SE7709972A patent/SE430351B/en unknown
- 1977-09-12 CA CA286,551A patent/CA1069112A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ZA775326B (en) | 1978-07-26 |
| SE430351B (en) | 1983-11-07 |
| SE7709972L (en) | 1978-03-14 |
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