CA1313170C - Impeller bar installation and repositioning means for impact crushers having "open" type rotors - Google Patents
Impeller bar installation and repositioning means for impact crushers having "open" type rotorsInfo
- Publication number
- CA1313170C CA1313170C CA000595823A CA595823A CA1313170C CA 1313170 C CA1313170 C CA 1313170C CA 000595823 A CA000595823 A CA 000595823A CA 595823 A CA595823 A CA 595823A CA 1313170 C CA1313170 C CA 1313170C
- Authority
- CA
- Canada
- Prior art keywords
- disc
- bar
- wedge
- impeller
- side wall
- 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 - Lifetime
Links
Abstract
IMPELLER BAR INSTALLATION AND REPOSITIONING
MEANS FOR IMPACT CRUSHERS HAVING "OPEN" TYPE ROTORS
ABSTRACT
The impeller bars of an "open" type rotor of an impact crusher are clamped to each disc of the rotor by means of pairs of cooperating wedges. Each pair of wedges consists of a first wedge acting radially outwards of the rotor between the disc and the impeller bars and a second wedge acting axially of the rotor between the disc and the first wedge to drive the first wedge radially outwards.
MEANS FOR IMPACT CRUSHERS HAVING "OPEN" TYPE ROTORS
ABSTRACT
The impeller bars of an "open" type rotor of an impact crusher are clamped to each disc of the rotor by means of pairs of cooperating wedges. Each pair of wedges consists of a first wedge acting radially outwards of the rotor between the disc and the impeller bars and a second wedge acting axially of the rotor between the disc and the first wedge to drive the first wedge radially outwards.
Description
13~3170 IMPELLER BAR INSTALLATION AND REPOSITIONING
MEANS FOR IMPACT CRUSHERS ~AVING "OPEN" TYPE
ROTORS
Impact crushers of the impeller type typically utilize a rotor having several axially extending impeller bars disposed in recesses about its periphery. The impeller bars strike the rock entering the crusher and hurl it against one or more sets of breaker bars in the process of reducing the rock to size. From time to time the impeller bars, since they are abraded by the rock, must be adjusted to compensate for wear and then finally replaced which in turn requires that they be removably attached to the rotor. At the same time the attachment must be mechanically secure and rigid enough for the bars to withstand the rapid and repeated blows with which they strike the rock.
The prior art abounds with schemes for removably affixing impeller bars to their rotors. The most prevalent, it seems, employ wedges of various configurations and func-tions, whether the rotors themselves are of the "solid" cast type or of the "open" type consisting of several axially spaced discs. Generally speaking, the wedges in these instances act in one of two ways: either radially of or axially of the rotor. But in varying degrees all of the foregoing suffer from one or more of the following: complexity, weight, poor access-~ ibility for inspection, adjustment or replacement, high manu-; facturing costs, and "liming" which increases the difficulty of adjustment or replacement. So the chief object of the present invention is a wedging arrangement for the impeller bars of an "open" type rotor which reduces er eliminates the impediments and detractions typical of the prior art. Another ~3~3~0 ob~ect of the invention is a simple but e~fective manner o~
manipulating the impeller bars when installing them initially and for reposition$ng them later to compensate for wear.
The wedging arrangement of the invention employs a pair of wedges removably securing each impeller bar to its respective rotor disc. Each pair of wedges consists of a first wedge acting radially of a rotor disc between the side wall of a recess in the disc and the leading face of the impeller bar, and a second wedge acting axially of the disc between the radially inner end wall of the recess and the radially inner end of the first wedge. The latter end of the first wedge is provided with a wedging face which mates with a cooperating wedging face on the second wedge, the latter wedgP being urged against the first wedge by a bolt axially through the second wedge, on the one hand, and an anchor plate and nut operative against one face of the rotor disc, on the other hand.
Hence in its broad aspect the invention contemplates a rotor assembly for an impact crusher, the rotor having a rotational axis and at least one pair of axially spaced rotor discs extending radially of the rotor assembly with respect to the axis. The discs have axially aligned sets of recesses transversely therethrough and equally spaced thereabout, the recesses extending generally radially inwards from the peri-phery of each disc. Each disc recess has a pair of opposed first and second spaced side walls and a radially inner end wall extending transversely of the disc. An axially extending impeller bar is disposed in each disc recess, each impeller bar having first and second opposite, outward facing side walls, the bar first side wall being in opposed spaced relation to the ~31~70 disc recess first side wall. The disc recess and bar flrst side walls converge towards eaoh other ln a generally radially outwards direction. There ~re provided first means operative between the disc recess and bar first side walls and second means operative between the disc recess and bar second side walls for retaining each impeller bar in its respective disc recess. The first retaining means for each disc recess includes first and second wedges, the first wedge being dis-posed between the disc recess and bar first side walls and movable therebetween in a generally radially outwards direction ;into wedging engagement with the disc recess and bar first side walls. The first wedge has a radially inner end wall in spaced opposed relation to the adjacent disc recess end wall, the disc recess and first wedge end walls converging towards each other in a direction transversely of the disc. The second wedge is disposed in turn between the disc recess and first wedge end walls and movable therebetween in a direction transversely of the disc into wedging engagement with the disc recess and first wedge end walls. Finally, means operative between the disc and the second wedge are provided to urge the second wedge in said transverse direction and thereby the first wedge in said out-ward direction.
The parts involved are simple, relatively light in -~weight, easily manufactured, and readily accessible either for ;25 inspection or for adjustment or replacement of the impeller bars on account of wear. Liming between the parts is quickly broken by a few hammer blows once the bolts through the second wedges are removed. Each impeller bar is provided with a hole 1313~70 through lt from side to side at it~ center o~ gravity so that the bar can be lifted onto the rotor by a hook.
Other feature~ and advantages o~ the present inven-tion will become apparent ~rom the more detailed description which follows and the drawings, in which:
Figure 1 i8 an end view of an "open" type rotor of an impact crusher illustrating the installation of the impeller bars according to the invention, one set of bars being omitted in order to depict the configuration of one of the recesses in the rotor discs.
Eigure 2 is a sectional view of the rotor taken along the line 2-2 of Figure 1~
Figure 3 which appears with Figure 1 is a sectional view taken along the line 3-3 of Figure 1.
Figure 4 which also appears with Figure 1 is a per-spective view o~ a portion of the rotor of Figure 1 showing the installation at the outer end of one of the breaker bars.
Referring first to Figures 1 and 2, the rotor 10 con-si6t~ of a number of di6cs 11 equally axially spaced along a cylindrical tube 12 to which the discs 11 are welded. The tube 12 is counterbored at each end into which are fitted a pair of hubs 13 having flange6 14 bolted at 15 to the two end-most discs 11, whence the rotor 10 revolves about the axis of the tube 12 and hubs 13. The discs 11 are provided with four sets of axially aligned recesses 16 e~ually spaced about their peripheries. It will be understood, of course, that the re-..
cesses 16 could be greater or fewer in number without affectingthe endeavor of the invention. Each recess 16 extends gener-*As shown with Figure 1.
13~3'1q ally radially inwards and, with respect to the direction ofrotation indicated by the arrow in Figure 1, includes a leadlng side wall 16a, an opposing trailing side wall 16b and an end wall 16c of the spacing and configuration shown at the left in Figure 1, the trailing side walls 16b having a greater radial extent than the leading side walls 16a. Adjacent their outer ends the trailing side walls 16b of each set of recesses 16 are circularly relieved to partially encompass a cylindrical back-up bar 17 welded to the discs 11.
Each set of disc recesses 16 in turn receives a pair of impeller bars 18 disposed end-to-end, each impeller bar 18 being rectangular in plan but slightly trapezoidal in cross-section for casting purposes. Each bar 18 is cast with an axially extending, shallow seat 19 in its leading side wall 18a midway between its radially inner and outer ends (see Figures 1 and 2) and concentric with the back-up bars 17. The trailing side wall 18b of each impeller bar 18, which is parallel to the leading side wall 18a, is cast with a pair of similar, radially spaced seats 20a, 20b, the outer seat 20a of each bar 18 re-ceiving the bacX-up bar 17 when the impeller bars 18 are initially installed, as shown in the drawings. In that posi-tion the radially inner portions of the bar side walls 18b abut the radially inner portions of the recess side walls 16b and the recess side walls 16a and the bar side walls 18a converge towards each other in a radially outward direction. The outer axial ends of each pair of impeller bars 18 overhang the out-board faces of the two end discs 11, as shown in Figures 2 and 4, each end of the bars 18 being provided with a pair of oppo-site, radially elongated insets 21 having axially inner faces 21a flush with the outer faces of the discs 11 (see Figures 2 ~31~70 and 4). The impeller bars 18 are held against axial movement by retainer blocks 22 overlapping the discs 11 and the bar inset faces 21a, the blocks 22 being counterbored to encompass the heads of bolts 23 securing the blocks 22 to the axial end faces 17a of the back-up bars 17 (see Figures 2 and 4). Each impeller bar 18 is also provided with a circular hole 24 (see Figure 2) from its side wall 18a through its side wall 18b and located at its center of gravity, that is to say in this case, at the geometrical centers of the side walls 18a, 18b, all for the purposes to be descri~ed.
As previously noted each impeller bar 18 is clamped to the discs 11 by a pair of wedges disposed in the recesses 16 of each disc 11. The first wedges 25 act radially outwards between the converging recess side walls 16a and impeller bar side walls 18a, the wedges 25 having wedging faces 25a (see Figure 2) operative along the recess side walls 16a and wedging faces 25b (see Figure 3) operative along the impeller bar side walls 18a. The wedges 25 are axially retained in position by partial lips 26 (see Figures 2, 3 and 4) which straddle the faces of the discs 11, the wedges 25 extending radially inwards of the lips 26 and provided at their radially inner ends with transverse wedging faces 25c (see Figures 2 and 3). The second wedges 30 act axially between the recess end walls 16c and the faces 25c of the first wedges 25, the wedges 30 having wedging faces 30a operative across the recess end walls 16c and wedging faces 30b (see Figures 2 and 3) cooperating with the faces 25c of the first wedges 25. The wedges 30 are urged axially of the discs 11 by axially directed, headed bolts 31 through the wedges 30 and anchor plates 32 overlying the faces of the discs 0 11 at the converging ends of the disc recess end walls 16c and ~3~3170 the faces 25c of the first wedges 25. When nuts 33 at theother ends of the bolts 31 are tightened, axial movement of the wedges 30 forces the wedges 25 radially outwards by virtue of the cooperating wedging faces 25c and 30b. ~elleville washers 34 (see Figure 3) are preferably interposed between the plates 32 and nuts 33 to maintain tension on the wedges 30 in all events. Hence the impeller bars 18 are held securely in posi-tion between the disc recess side walls 16b and the back-up bars 17 on the one hand, and the wedges 25 on the other hand.
Note that the wedges 25 and 30 are simple in structure and of relatively light weight. They are easily manufactured inasmuch as tolerances are not critical since the wedges 30 at all times act positively on the wedges 25 and the bolts 31 and anchor plates 32 in turn on the wedges 30. Cracking, breakage or loosening of any of the wedges 25 or 30 can also be readily observed during routine inspection of the rotor 10. Should the wedges 25 and 30 loosen for some reason, the retainer blocks 22 will prevent the impeller bars 18 from moving axially and striking the end walls (not shown~ of the housing about the rotor 10.
MEANS FOR IMPACT CRUSHERS ~AVING "OPEN" TYPE
ROTORS
Impact crushers of the impeller type typically utilize a rotor having several axially extending impeller bars disposed in recesses about its periphery. The impeller bars strike the rock entering the crusher and hurl it against one or more sets of breaker bars in the process of reducing the rock to size. From time to time the impeller bars, since they are abraded by the rock, must be adjusted to compensate for wear and then finally replaced which in turn requires that they be removably attached to the rotor. At the same time the attachment must be mechanically secure and rigid enough for the bars to withstand the rapid and repeated blows with which they strike the rock.
The prior art abounds with schemes for removably affixing impeller bars to their rotors. The most prevalent, it seems, employ wedges of various configurations and func-tions, whether the rotors themselves are of the "solid" cast type or of the "open" type consisting of several axially spaced discs. Generally speaking, the wedges in these instances act in one of two ways: either radially of or axially of the rotor. But in varying degrees all of the foregoing suffer from one or more of the following: complexity, weight, poor access-~ ibility for inspection, adjustment or replacement, high manu-; facturing costs, and "liming" which increases the difficulty of adjustment or replacement. So the chief object of the present invention is a wedging arrangement for the impeller bars of an "open" type rotor which reduces er eliminates the impediments and detractions typical of the prior art. Another ~3~3~0 ob~ect of the invention is a simple but e~fective manner o~
manipulating the impeller bars when installing them initially and for reposition$ng them later to compensate for wear.
The wedging arrangement of the invention employs a pair of wedges removably securing each impeller bar to its respective rotor disc. Each pair of wedges consists of a first wedge acting radially of a rotor disc between the side wall of a recess in the disc and the leading face of the impeller bar, and a second wedge acting axially of the disc between the radially inner end wall of the recess and the radially inner end of the first wedge. The latter end of the first wedge is provided with a wedging face which mates with a cooperating wedging face on the second wedge, the latter wedgP being urged against the first wedge by a bolt axially through the second wedge, on the one hand, and an anchor plate and nut operative against one face of the rotor disc, on the other hand.
Hence in its broad aspect the invention contemplates a rotor assembly for an impact crusher, the rotor having a rotational axis and at least one pair of axially spaced rotor discs extending radially of the rotor assembly with respect to the axis. The discs have axially aligned sets of recesses transversely therethrough and equally spaced thereabout, the recesses extending generally radially inwards from the peri-phery of each disc. Each disc recess has a pair of opposed first and second spaced side walls and a radially inner end wall extending transversely of the disc. An axially extending impeller bar is disposed in each disc recess, each impeller bar having first and second opposite, outward facing side walls, the bar first side wall being in opposed spaced relation to the ~31~70 disc recess first side wall. The disc recess and bar flrst side walls converge towards eaoh other ln a generally radially outwards direction. There ~re provided first means operative between the disc recess and bar first side walls and second means operative between the disc recess and bar second side walls for retaining each impeller bar in its respective disc recess. The first retaining means for each disc recess includes first and second wedges, the first wedge being dis-posed between the disc recess and bar first side walls and movable therebetween in a generally radially outwards direction ;into wedging engagement with the disc recess and bar first side walls. The first wedge has a radially inner end wall in spaced opposed relation to the adjacent disc recess end wall, the disc recess and first wedge end walls converging towards each other in a direction transversely of the disc. The second wedge is disposed in turn between the disc recess and first wedge end walls and movable therebetween in a direction transversely of the disc into wedging engagement with the disc recess and first wedge end walls. Finally, means operative between the disc and the second wedge are provided to urge the second wedge in said transverse direction and thereby the first wedge in said out-ward direction.
The parts involved are simple, relatively light in -~weight, easily manufactured, and readily accessible either for ;25 inspection or for adjustment or replacement of the impeller bars on account of wear. Liming between the parts is quickly broken by a few hammer blows once the bolts through the second wedges are removed. Each impeller bar is provided with a hole 1313~70 through lt from side to side at it~ center o~ gravity so that the bar can be lifted onto the rotor by a hook.
Other feature~ and advantages o~ the present inven-tion will become apparent ~rom the more detailed description which follows and the drawings, in which:
Figure 1 i8 an end view of an "open" type rotor of an impact crusher illustrating the installation of the impeller bars according to the invention, one set of bars being omitted in order to depict the configuration of one of the recesses in the rotor discs.
Eigure 2 is a sectional view of the rotor taken along the line 2-2 of Figure 1~
Figure 3 which appears with Figure 1 is a sectional view taken along the line 3-3 of Figure 1.
Figure 4 which also appears with Figure 1 is a per-spective view o~ a portion of the rotor of Figure 1 showing the installation at the outer end of one of the breaker bars.
Referring first to Figures 1 and 2, the rotor 10 con-si6t~ of a number of di6cs 11 equally axially spaced along a cylindrical tube 12 to which the discs 11 are welded. The tube 12 is counterbored at each end into which are fitted a pair of hubs 13 having flange6 14 bolted at 15 to the two end-most discs 11, whence the rotor 10 revolves about the axis of the tube 12 and hubs 13. The discs 11 are provided with four sets of axially aligned recesses 16 e~ually spaced about their peripheries. It will be understood, of course, that the re-..
cesses 16 could be greater or fewer in number without affectingthe endeavor of the invention. Each recess 16 extends gener-*As shown with Figure 1.
13~3'1q ally radially inwards and, with respect to the direction ofrotation indicated by the arrow in Figure 1, includes a leadlng side wall 16a, an opposing trailing side wall 16b and an end wall 16c of the spacing and configuration shown at the left in Figure 1, the trailing side walls 16b having a greater radial extent than the leading side walls 16a. Adjacent their outer ends the trailing side walls 16b of each set of recesses 16 are circularly relieved to partially encompass a cylindrical back-up bar 17 welded to the discs 11.
Each set of disc recesses 16 in turn receives a pair of impeller bars 18 disposed end-to-end, each impeller bar 18 being rectangular in plan but slightly trapezoidal in cross-section for casting purposes. Each bar 18 is cast with an axially extending, shallow seat 19 in its leading side wall 18a midway between its radially inner and outer ends (see Figures 1 and 2) and concentric with the back-up bars 17. The trailing side wall 18b of each impeller bar 18, which is parallel to the leading side wall 18a, is cast with a pair of similar, radially spaced seats 20a, 20b, the outer seat 20a of each bar 18 re-ceiving the bacX-up bar 17 when the impeller bars 18 are initially installed, as shown in the drawings. In that posi-tion the radially inner portions of the bar side walls 18b abut the radially inner portions of the recess side walls 16b and the recess side walls 16a and the bar side walls 18a converge towards each other in a radially outward direction. The outer axial ends of each pair of impeller bars 18 overhang the out-board faces of the two end discs 11, as shown in Figures 2 and 4, each end of the bars 18 being provided with a pair of oppo-site, radially elongated insets 21 having axially inner faces 21a flush with the outer faces of the discs 11 (see Figures 2 ~31~70 and 4). The impeller bars 18 are held against axial movement by retainer blocks 22 overlapping the discs 11 and the bar inset faces 21a, the blocks 22 being counterbored to encompass the heads of bolts 23 securing the blocks 22 to the axial end faces 17a of the back-up bars 17 (see Figures 2 and 4). Each impeller bar 18 is also provided with a circular hole 24 (see Figure 2) from its side wall 18a through its side wall 18b and located at its center of gravity, that is to say in this case, at the geometrical centers of the side walls 18a, 18b, all for the purposes to be descri~ed.
As previously noted each impeller bar 18 is clamped to the discs 11 by a pair of wedges disposed in the recesses 16 of each disc 11. The first wedges 25 act radially outwards between the converging recess side walls 16a and impeller bar side walls 18a, the wedges 25 having wedging faces 25a (see Figure 2) operative along the recess side walls 16a and wedging faces 25b (see Figure 3) operative along the impeller bar side walls 18a. The wedges 25 are axially retained in position by partial lips 26 (see Figures 2, 3 and 4) which straddle the faces of the discs 11, the wedges 25 extending radially inwards of the lips 26 and provided at their radially inner ends with transverse wedging faces 25c (see Figures 2 and 3). The second wedges 30 act axially between the recess end walls 16c and the faces 25c of the first wedges 25, the wedges 30 having wedging faces 30a operative across the recess end walls 16c and wedging faces 30b (see Figures 2 and 3) cooperating with the faces 25c of the first wedges 25. The wedges 30 are urged axially of the discs 11 by axially directed, headed bolts 31 through the wedges 30 and anchor plates 32 overlying the faces of the discs 0 11 at the converging ends of the disc recess end walls 16c and ~3~3170 the faces 25c of the first wedges 25. When nuts 33 at theother ends of the bolts 31 are tightened, axial movement of the wedges 30 forces the wedges 25 radially outwards by virtue of the cooperating wedging faces 25c and 30b. ~elleville washers 34 (see Figure 3) are preferably interposed between the plates 32 and nuts 33 to maintain tension on the wedges 30 in all events. Hence the impeller bars 18 are held securely in posi-tion between the disc recess side walls 16b and the back-up bars 17 on the one hand, and the wedges 25 on the other hand.
Note that the wedges 25 and 30 are simple in structure and of relatively light weight. They are easily manufactured inasmuch as tolerances are not critical since the wedges 30 at all times act positively on the wedges 25 and the bolts 31 and anchor plates 32 in turn on the wedges 30. Cracking, breakage or loosening of any of the wedges 25 or 30 can also be readily observed during routine inspection of the rotor 10. Should the wedges 25 and 30 loosen for some reason, the retainer blocks 22 will prevent the impeller bars 18 from moving axially and striking the end walls (not shown~ of the housing about the rotor 10.
Claims (7)
1. A rotor assembly for an impact crusher, comprising a rotor having a rotational axis and at least one pair of axially spaced rotor discs extending radially of the rotor assembly with respect to said axis, the discs having axially aligned sets of recesses transversely therethrough and equally spaced thereabout, the recesses extending generally radially inwards from the periphery of each disc, each disc recess having a pair of opposed first and second spaced side walls and a radially inner end wall extending transversely of the disc, an axially extending impeller bar disposed in each disc recess, each impeller bar having first and second opposite, outward facing side walls, the bar first side wall being in opposed spaced relation to the disc recess first side walls, the disc recess first side wall and bar first side walls converging towards each other in a generally radially outwards direction and first means operative between the disc recess first side wall and bar first side wall and second means operative between the disc recess second side wall and bar second side wall for retaining each impeller bar in its respective disc recess, the first retaining means for each disc recess including: first and second wedges, the first wedge being disposed between the disc recess first side wall and bar first side wall and moveable therebetween in a generally radially outward direction into wedging engagement with the disc recess first side wall and bar first side wall, the first wedge having a radially inner end wall in spaced opposed relation to the disc recess end wall, the disc recess end wall and first wedge end wall converging towards each other in a direction transversely of the disc, the second wedge being disposed between the disc recess end wall and first wedge end wall and moveable therebetween in a direction transversely of the disc into wedging engagement with the disc recess end wall and first wedge end wall and means operative between the disc and the second wedge to urge the second wedge in said transverse direction and thereby the first wedge in said outward direction and to maintain tension on said wedges and holding the wedges securely in said wedging engagement.
2. The rotor assembly of claim 1 wherein the second impeller bar retaining means for each disc recess second side wall includes means interlocking the disc recess and bar second side wall effective to restrain radially outward movement of the bar when the first and second wedges are in said wedging engagement.
3. The rotor assembly of claim 2 wherein the urging means for the second wedge comprises a plate disposed adjacent the converging ends of the disc recess end wall and first wedge end wall and overlapping the disc, a headed bolt extending transversely of the disc through the plate and the second wedge and a nut on the other end of the bolt, the nut, upon being tightened on the bolt, urging the second wedge toward the plate and into such wedging engagement with the first wedge.
4. The rotor assembly of claim 3 wherein the second impeller bar retaining means comprises complementary reliefs in the disc recess second side wall and bar second side wall and an impeller bar retainer member disposed therein and secured to the disc, said reliefs and retainer member extending axially of the disc and wherein said wedging engagement of the first and second wedges maintains said relief in the impeller bar in engagement with the retainer member.
5. The rotor assembly of claim 4 wherein each impeller bar includes an axial end face extending transversely of said first and second side walls thereof and disposed adjacent an outer axial face of one of the rotor discs and including third retaining means operative between said axial end face of the bar and said outer face of the disc effective to restrain movement of the impeller bar in one axial direction relative to said disc, the third retching means being in addition to said first and second retaining means.
6. The rotor assembly of claim 5 wherein each of said impeller bar retaining members includes an axial end face adjacent said axial end face of the bar and said outer face of the disc, and wherein the third retaining means includes a block secured to said axial end face of the impeller bar re-tainer member and engaging said axial end face of the bar and said outer face of the disc.
7. The rotor assembly of claim 1 including third impeller bar retaining means at each end of said second retaining means, each such third impeller bar retaining means including at least one retainer overlapping adjacent portions of a selected one of the impeller bars and of one of the rotor discs and being operative to restrain movement of the selected impeller bar axially of the rotor assembly, the third retaining means being in addition to said first and second retaining means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18212088A | 1988-04-15 | 1988-04-15 | |
| US182,120 | 1988-04-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1313170C true CA1313170C (en) | 1993-01-26 |
Family
ID=22667133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000595823A Expired - Lifetime CA1313170C (en) | 1988-04-15 | 1989-04-05 | Impeller bar installation and repositioning means for impact crushers having "open" type rotors |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU615281B2 (en) |
| CA (1) | CA1313170C (en) |
| NZ (1) | NZ228746A (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2033578A5 (en) * | 1969-02-28 | 1970-12-04 | Fives Lille Cail | |
| US4373678A (en) * | 1980-06-30 | 1983-02-15 | Reitter Guenther W | Rotary impact crusher having a continuous rotary circumference |
| US4597538A (en) * | 1984-05-16 | 1986-07-01 | Getz Roland A | Asphalt comminuting apparatus |
-
1989
- 1989-04-05 CA CA000595823A patent/CA1313170C/en not_active Expired - Lifetime
- 1989-04-10 AU AU32607/89A patent/AU615281B2/en not_active Expired
- 1989-04-14 NZ NZ22874689A patent/NZ228746A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU3260789A (en) | 1989-10-19 |
| AU615281B2 (en) | 1991-09-26 |
| NZ228746A (en) | 1991-04-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |