US2325605A - Impact member for impact crushers and securing means therefor - Google Patents

Description

1943- o. c. GRUENDER L 2,325,605

IMPACT MEMBER FOR IMPACT CRUSHERS AND SECURING MEANS THEREFOR Filed June 14, 1941 2 Sheets-Sheet -l Ailg- 1943- o. c. GRUENDER E-r 2,325,605

IMPACT MEMBER FOR IMPACT CRUSHERS AND SECURING MEANS THERHFOR Filed June 14, 1941 2 Sheets-Sheet 2 sssswamsms 1 I I r frzven o 7 3 0,5ca7" C. gram/radar, EwaZcZ 7Vr7ze7" Patented Aug. 3, 1943 PATENT OFFICE IMPACT MEMBER FOR. IMPACT CRUSIIEBS AND SECURING MEANS THEREFOR Oscar C. Gruender and Ewald Werner, Milwau kee, Wis., assignors to Nordberg Manufacturing 00., Milwaukee, Wis., a corporation of Wisconsin Application June 14, 1941, Serial No. 398,056

22 Claims.

Our invention relates to an improvement in impact crushers and has for one purpose the provision of an improved impact member for the impeller of an impact crusher.

Another purpose is the provision of a removable replaceable impeller member which can readily be applied.

Another purpose is the provision of such a member which is centrifugally locked in position.

Another purpose is the provision of such a member which is normally held against chattering or choking when the impeller is rotating at speeds insufiicient to' maintain the centrifugal locking action, as when the impeller is accelerating or decelerating.

Another purpose is the provision of chatter preventing means which can readily be released to permit the removal of the impact member from, the impeller.

Other purposes will appear from, time to time in the course of the specification and claims.

The invention is illustrated more or less diagrammatically in the accompanying drawings wherein:

Fig. 1 is a vertical section taken l-l of Fig. 2;

Fig. 2 is a section on the line 2-2 of Fig. 1;

Fig. 3 is a similar section with the parts in a different position; and

Fig. 4 is a section on the line 4-4 of Fig. 1.

Like parts are indicated by like symbols throughout the specification and drawings.

Referring to the drawings, I generally indicates the shaft of the impeller of an impact crusher. It will be realized that any suitable means may be employed for rotating the shaft, the details of which do not form part of the present invention and are not herein shown. 2 is any suitable impeller hub mounted on or keyed to the shaft I, as by the key 3. 4 indicate any suitable webs extending from the hub 2 and supporting the outer shell or portion 5 of the impeller. It will be observed that the portion or portions 5 have outer more or less spiral surfaces 5, which extend from a portion of maximum diameter I to a portion of minimum diameter 8.

Any suitable number of impellers may be emon the line ployed. Where two are employed, as in the present instance, there will be two spiral faces 6, the point of maximum diameter I of each being opposed to the point of minimum diameter I of the opposite, and being separated therefrom by a space suflicient to permit the endwise insertion of the impeller member.

A pocket having a more or less cylindrical inner wall 9 is provided. At the bottom of this pocket 9 is a guideway bounded by opposite parallel walls i0 and bottom walls II, which converge downwardly, as shown in Figs. 2 and 3. Extending inwardly from the generally cylindrical wall 9, at an upper portion thereof, are lugs l2, of which two are shown at each side of the pocket, arranged in pairs opposite each other. The upper walls of the pocket are also oppositely cut away at two points, as at l3 and H, as shown for example in Fig. 4.

The impact member includes an impact portion or bar proper, l5, which has a forward edge It and a rearward sloping face ll. It will be understood that preferably the forward edge It i farther from the axis of rotation of the impeller than is the sloping face IT. The bar is herein shown with a generally radial forward face l9, but it will be understood that the forward face may be otherwise formed, if desired. The bar has a sloped inner face 20, from which extends downwardly a pair of lugs 2|, each of which has generally cylindrically walled outer extensions 22, 23 at each side thereof. It will be understood that when the impact member is in crushing position the cylindrical faces of the members 22, 23 abut against the oppositecylindrically surfaced lugs or projections l2.

25 is a lockin lug extending rearwardly from the impact bar l5 and is adapted to penetrate one of the cavities M in the wall of the cylindrical pocket, as shown for example in Fig. 4. It will be understood that the impact member may be inserted by aligning the lugs2l with the pairs of apertures l3 and I4, this position of the parts being illustrated in Fig. 3. This permits the lugs 2| to penetrate within the cylindrical wall pocket 9. Then the impact member is moved endwise until it is in the position in which it is shown in Figs. 2 and 4. It may then be slightly rotated in order to engage the locking lug 25 with one of the pockets l4, the position in which the parts are shown in Fig. 4. This engagement with a locking ing 25 prevents any unintended endwise movement of the impact member, and no end plates or other securing means are necessary.

When the impeller is rotating, the impact member will be centrifugally locked in the position in which it is shown in Fig. 1, with the locking lug 25 in locking position and with the rear upper faces of the lugs 2| abutting against the upper wall of the pocket, as shown at 30 in Figs. 1 and 4. However, when the impeller is at rest, or has just begun to accelerate, or has substantially decelerated, means are preferably provided for substituting the centrifugal locking thrust. We provide a double wedge member, having the opposite wedge elements 40, 4|, normally thrust apart by the coil spring 42, the ends of which penetrate pockets 43 in the members 40, 4|. The wedges are formed with faces conforming to the faces II at the bottom of the pocket, as shown in Fig. 2, and also conforming to corresponding wedge surfaces 44, which may be used at the bottoms of the lugs 2|. Thus, when the spring 42 is free to act, it thrusts the wedges 40, 4| apart, and they in turn hold the impact member locked in the position in which it is shown in Figs. 1 and 2.

When it is desired to remove the impact member, means are provided for drawing the wedges together. A bolt 45, for example, may be employed, with a pin 46 penetrating a corresponding slot 4'! at the end of the wedge 40. The pin is threaded, as at 48, and is provided with any suitable means, such as the nut 49, for drawing the two wedges 40, 4| together against the expansion of the spring 42, as shown in Fig. 3. When the wedges are thus drawn together, their effective wedging action against the bottom surfaces 44 of the flanges 2| is terminated, and the impact member may be rotated sufilciently to free the locking lug 25 from the aperture I4. It is then moved endwise sufficiently to align the lugs 2| with the pairs of apertures I31 and I4, and the impact member is then lifted outwardly from the impeller. The result is a structure of maximum simplicity and ease of insertion and removal.

It will be understood that in the use of the device, any suitable means may be employed for feeding the material to be crushed into the path of movement of the impeller members. Illustrated, for example, is a vertical chute Bll, down which the material to be crushed may be dropped by gravity. It will be understood that the impeller is rotated at sufficient speed and is of sufficient size and mass to exercise a crushing impact against the particles dropped in the path of movement of the impeller I5.

It will be realized that, whereas we have described and illustrated a practical and operative device, nevertheless many changes may be made in the size, shape, number and disposition of parts without departing from the spirit of the invention. We therefore wish our description and drawings to be taken as in a broad sense illustrative or diagrammatic, rather than as limiting us to our precise showing.

The use and operation of our invention are as follows:

' {peller having an axially extending socket open small in mass in relation to the mass of the bar as a whole. Also, no matter how far worn down the bar l5 becomes, there is still sufficient mass and sufficient leverage so that the centrifugal effect of the rotation of the impeller keeps the impact member locked in position, with the looking lug 25 penetrating the aperture M.

We claim:

1. In combination, in an impact crusher, an impeller, and means for rotating it, said imat its ends and bounded by spaced overhanging walls which define a space which decreases outwardly in width between such walls, an impact memberincluding an axially extending bar located exteriorly to the impeller, a plurality of lugs extending inwardly from the bar and having faces conforming to the opposed faces of said overhanging walls and normally centrlfugally thrust into contact therewith, and additional means for urging said lugs against the opposed faces of the overhanging walls, including spring wedge means interposed between the bottom of said socket and the lower edges of said lugs.

2. In combination, in an impact crusher, an impeller, and means for rotating it, said impeller having an axially extending socket open at its ends and bounded by spaced overhanging walls which define a space which decreases outwardly in width between such walls, an impact member including an axially extending bar located exteriorly to the impeller, a plurality of lugs extending inwardly from the bar and having faces conforming to the opposed faces of said overhanging walls and normally centrifugally thrust into contact therewith, and additional means for urging said lugs against the opposed faces of the overhanging walls, including a pair of wedges interposed between the bottom of the socket and the lower edges of said lugs, and yielding means tending normally to urge said wedges outwardly toward the ends of the socket.

3. In combination, in an impact crusher, an impeller, and means for rotating it, said impeller having an axially extending socket open at its ends and bounded by spaced overhanging walls which define a space which decreases outwardly in width between such walls, an impact member including an axially extending bar located exteriorly to the impeller, a plurality of lugs extending inwardly from the bar and havving faces conforming to the opposed faces of In impact crushers in which the particles are fed into the path of movement of the impact members of an impeller, there is a'substantial and continuing wear. It is, therefore, important to be able to remove the worn impact member. It is also important to provide a member of such form as to provide a maximum period of wear before renewal becomes necessary.

We provide an impact member, including a substantial bar or mass of metal Hi. We may employ, for example, manganese steel, or any equivalent material. The wearing surface, which may initially for example be generally radial, is worn back progressively until finally so much of the bar is worn that replacement is necessary. It will be observed that the major part of the mass of the impact member herein shown is in the bar itself, and the attaching lugs 2| are relatively said overhanging walls and normally centrifugally thrust into contact therewith, and additional means for urging said lugs against the opposed faces of the overhanging walls, including a pair of wedges interposed between the bottom of the socket and the outer edges of said lugs, and yielding means tending normally to urge said wedges outwardly toward the ends of the socket, the bottom of said socket being in clined in relation to the axis of the crusher.

4. In combination, in an impact crusher, an impeller, and means for rotating it, said impeller having 'a plurality of axially extending sockets open at at least one end and bounded by spaced overhanging walls which define a space which decreases generally radially outwardly in width between such walls, one of said walls extending radially a greater distance than the other, and an impact member including an axially extending bar having an impact face at one side thereof and an impeller engaging portion at the other side thereof opposed to the wall of greater radial extension, said bar having a lug inwardly extendaaaaeos wedge means interposed between the opposed faces of impact member and impeller.

5. In combination, in an impact crusher, a impeller, and means for rotating it, said impeller having an axially extending socket bounded by spaced overhanging walls which define a space which decreases outwardly in width between such walls, the upper edges of said walls being provided with cutaway portions of a width greater than the normal width of the space defined by the outer edges of said walls, and an impact member, including an axially extending bar located exteriorly to the impeller, and a plurality of lugs extending from the bar and having faces conforming to the opposed faces of said overhanging walls and of a size and shape adapted to permit their insertion through said enlarged portions and normally centrifugally thrust into contact with the opposed faces of the overhanging walls when the rotor is being rotated, the inner ends of the lugs being outwardly spaced from the opposed portion of the socket bottom, and additional means for holding said lugs in contact with the opposed faces of th overhanging walls, including wedging means interposed between said lugs and the bottom of the socket.

6. In combination, in an impact crusher, an impeller, and means for rotating it, said impeller having an axially extending socket bounded by spaced overhanging walls which define a space which decreases outwardly in width between such walls, the upper edges of said walls being provided with cutaway portions of a width greater than the normal width of the space defined'by the outer edges of said walls, and an impact member, including an axially extending bar located exteriorly to the impeller, and a plurality of lugs extending from the bar and having faces conforming to the opposed faces of said overhanging walls and of a size and shape adapted to permit their insertion through said enlarged portionsand normally centrifugally thrust into contact with the opposed faces of the overhanging walls when the rotor is being rotated, the inner ends of the lugs being outwardly spaced from the opposed portion of the socket bottom, and additional means for holding said lugs in contact with th opposed faces of the'overhanging walls, including a plurality of wedges, one interposed between each of said lugs and the bottom of the socket, and yielding means for urging said wedges in opposite directions.

,7. In combination, in an impact crusher, an impeller, and means for rotating it, said impeller having an axially extending socket bounded by spaced overhanging walls which define a space which decreases outwardly in width between such walls, the upper edges of said walls being provided withcutaway portions of a width greater than the normal width of the space defined by the outer edges'of, said walls, and an impact member, including an axially extendingbar located exteriorly to the impeller, and a plurality of lugs extending from the bar and having faces conforming to the opposed faces of said overhanging walls and of a size and shape adapted to permit their insertion through said enlarged portions and normallycentrifugally thrust into contact with the opposed faces of the overhanging walls when the rotor is being rotated, the inner ends-of the lugs being 'outwardlyspaced from the opposed portion of the'socket bottom, andfadditional means for holding said lugs in contact with the opposed faces of the overhanging walls, including wedglng means interposed between said lugs and the bottom of the socket, the portion of each lug and the portion ofthe bottom of the socket opposed to such wedging means being inclined in opposite directions in relation to the axis of thrust of the wedging means.

8. In combination, in an impace crusher, an

"impeller, and means for rotating it, said impeller having an axiallyextending socket bounded by spaced overhanging walls which define a space which decreases outwardly in width between such walls, the upper edges of said walls being provided with cutaway portions of a width greater than the normal width of the space defined by the outer edges of said walls, and an impact member, including an axially extending bar located exteriorly to the impeller, and a plurality of lugs extending from the bar and having faces conforming to the opposed faces of said overhanging walls and of a siz and shape adapted to permit their insertion through said enlarged portions and normally centrifugally thrust into contact with the opposed faces of the overhanging walls when the rotor is being rotated, the inner ends of the lugs being outwardly spaced from the opposed portion of the socket bottom, and additional means for holding said lugs in contact with the opposed faces of the overhanging walls, including a plurality of wedges, one interposed between each of said lugs and the bottom of the socket, and yielding means for urging said wedges in opposite directions, the portion of each lug and the portion of the bottom of the socket opposed to such wedge being inclined in opposite directions in relation to the axis of thrust of such wedge.

9. In combination, in an impact crusher, an impeller, and means for rotating it, said impeller having a plurality of axially extending sockets adjacent its periphery open at least at one end and bounded by spaced overhanging walls which define a longitudinally extending communicating aperture between said sockets and the exterior of the impeller, one of said walls being more distant radially from the axis of rotation of the impeller than the other, the walls of the opposite sides of said socket being formed with generally concentric partly cylindrical surfaces, and an impact member including an axially extending bar having an impact face at one side thereof,

and an impeller engaging portion at the other side thereof, the latter being opposed to the wall of greater radial extension, saidbar havin one or more lugs radially inwardly extending therefrom havinggenerally cylindrical faces conforming to the opposed cylindrical faces of said overhanging walls.

10. In combination, in animpact crusher, an impeller, and means for rotating it, said impeller having a plurality of axially extending sockets adjacent its periphery open at least at one end and bounded by spaced overhanging walls which define a longitudinally extending communicatin aperture between said sockets and the exterior of the impeller, one of said walls beingmore distant radially from the axis ofrotation of the impeller than the other, the walls of the opposite sides of said socket being formed with generally concentric partly cylindrical surfaces, and an impact member including an axially extending bar having an impact face at one side thereof, and an impeller engaging portion at the other side thereof, the latter being opposed to the wall of greater radial extension, said bar having one or more lugs radially inwardly extending therefrom having generally cylindrical faces conforming to the opposed cylindrical faces of said overhanging walls, said lugs having a radial extenpeller having a plurality of axially extending sockets adjacent its periphery open at least at one end and bounded by spaced overhanging walls which define a longitudinally extending communicating aperture between said sockets and the exterior of the impeller, one of said walls being more distant radially from the axis of rotation of the impeller than the other, the walls of the opposite sides of said socket being formed with generally concentric partly cylindrical surfaces, and an impact member including an axially extending bar having an impact face at one side thereof, and an impeller engaging portion at the other side thereof, the latter being opposed to the wall of greater radial extension, said bar having one or more lugs radially inwardly extending therefrom having generally cylindrical faces conforming to the opposed cylindrical faces of said overhanging walls, and means for limiting the ravital inward movement of the impact member when centrifugalforce is not acting to maintain it in its outward position.

12. In combination, in an impact crusher, an impeller, and means for rotating it, said impeller having a plurality of axially extending sockets adjacent its periphery open at least at one end and bounded by spaced overhanging walls which define a longitudinally extending communicating aperture between said sockets and the exterior of the impeller, one of said walls being more distant radially from the axis of rotation of the impeller than the other, the walls of the opposite sides of said socket being formed with generally concentric partly cylindrical surfaces, and an impact member including an axially extending bar having an impact face at one side thereof, and an impeller engaging portion at the other side thereof, the latter being opposed to the wall of greater radial extension, said bar having one or more lugs radially inwardly extending therefrom having generally cylindrical face conforming to the opposed cylindrical faces of said overhanging walls, said lugs having a radial extension inwardly toward the axis of rotation of the impeller substantially less than the corresponding radial inward extension of the sockets, and means for limiting the gravital inward movement of the impact member when centrifugal force is not acting to maintain it in its outward position.

13. In combination, in an impact crusher, an impeller, and means for rotating it, said impeller having a plurality of axially extending sockets adjacent its periphery open at least at one end and bounded by spaced overhanging walls which define a longitudinally extending communicating aperture between said sockets and the exterior of the impeller, one of said walls being more distant radially from the axis of rotation of the impeller than the other, the walls of the opposite sides of said socket being formed with generally concentric partly cylindrical surfaces, and an impact member including an axially extending bar having an impact face at one side thereof, and an impeller engaging portion at the other side thereoiythe latter being opposed tothe wall of greater radial extension, said bar having one or more lugs radially inwardly extending therefrom having generally cylindrical faces conforming to the opposed cylindrical faces of said overhanging walls, the impeller engaging portion of the bar being adapted to interpenetrate with the opposed portion of the impellen'whereby unintended movement of the impact member is prevented during rotation of the impeller.

14. In combination, in an impact crusher, an impeller, and means for rotating it, said impeller having a plurality of axially extending sockets open at at least one end and bounded by spaced overhanging walls which define a space which decreases generally radially outwardly in width between such walls, one of said walls extending radially a greater distance than the other, and an impact member including an axially extending bar having an impact face at one side thereof and an impeller engaging portion at the other side thereof opposed to the wall of greater radial extension, said bar having a lug inwardly extending therefrom having faces conforming to the opposedfaces of said overhanging walls and normally centrifugally thrust into contact therewith when the impeller is being rotated, the radial inward extension of said sockets exceeding the radial inward extension of the lug when the lug is subjected centrifugal force, and means for limiting the inward penetration of said lug into said space when centrifugal force is not acting.

15. In combination, in an impact crusher, an impeller, and means for rotating it, said impeller having a plurality of axially extending sockets adjacent its periphery open at least at one end and bounded by spaced overhanging walls which define a longitudinally extending communicating aperture between said sockets and the exterior of the impeller, one of said walls being more distant radially from the axis of rotation of the impeller than the other, the walls of the opposite sides of said socket being formed with overhanging surfaces, and an impact member including an axially extending bar having an impact face at one side thereof, and an impeller engaging portion at the other side thereof, the latter being opposed to the wall of greater radial extension, said bar having one or more lugs radially inwardly extending therefrom having faces opposed to said overhanging surfaces, said lugs being in loose fit with said sockets, the impact member and lugs as a whole being inclined somewhat from the radial whereby, in response to centrifugal action, the impact bar is urged against the socket wall of greater radial extension.

16. In combination, in an impact crusher, an

- impeller, and means for rotating it, said impeller having a plurality of axially extending sockets adjacent its periphery open at least at one end and bounded by spaced overhanging walls which define a longitudinally extending communicating aperture between said sockets and the exterior of the impeller, one of said walls being more distant radially from the axis at rotation of the impeller than the other, the walls of the opposite sides of said socket beingformed with overhanging surfaces, and an impact member including an axialposed to the wall of greater radial extension, said bar having one or more lugs radially inwardly extending therefrom having faces opposed to said overhanging surfaces, said lugs being in loose fit with said sockets, the impact member and lugs as a whole being inclined somewhat from the radial whereby, in response to centrifugal action, the impact bar is urged against the socket wall of greater radial extension, the opposed portions of said wall and bar having interpenetrating means adapted to prevent movement of said bar in parallelism with the axis of the impeller during rotation of the impeller.

17., In combination, in an impact crusher, an impeller, and means for rotating it, said impeller having a plurality of axially extending sockets adjacent its periphery open at least at one end and bounded by spaced overhanging walls which define a longitudinally extending communicating aperture between said sockets and the exterior of the impeller, one of said walls bein more distant radially from'the axis of rotation of the impeller than the other, the walls of the opposite sides of said socket being formed with overhanging surfaces, and an impact member including an axially extending bar having an impact face at one side thereof, and an impeller engaging portion at the other side thereof, the latter being opposed to the wall of greater radial extension, said bar having one or more lugs radially inwardly extending therefrom having faces opposed to said overhanging surfaces, said lugs being in loose fit with said sockets, the impact member and lugs as a whole being inclined somewhat from the radial whereby, in response to centrifugal action. the impact bar is urged against the socket wall of greater radial extension, and means for limiting the gravital inward movement of said bar and lugs toward the axis of the impeller when the impeller is not being rotated.

18. In combination, in an impact crusher, an impeller and means for rotating it, said impeller having a plurality of axially extending sockets open at at least one end and bounded by spaced overhanging walls which define a space which decreases generally radially outwardly in width between such walls, and communicates with the exterior of the impeller, and impact members, each including an axially extending bar having an impact face at one side thereof, and an impeller engaging portion at the opposite side thereof opposed to one of said overhanging walls, each said bar having a lug inwardly extending therefrom having enlarged faces engaging the opposed faces of the overhanging walls of one of said sockets, and normally centrifugally thrust into holding contact therewith when the impeller is being rotated, the minimum separation of the opposed walls of the sockets, at the periphery of the impeller, exceeding the width of the lugs at that point, in a plane perpendicular to the axis of the impeller, the radial inward extension of said sockets exceeding the radial inward extension of the lug when the impact member is in operative position, the center of mass of the bar being located forwardly, in the direction of rotation of the impeller, in front of a radius passing through the center of the lug, whereby, in response to centrifugal force, the bar is urged against the side wall of the socket opposite to the impacting face of the bar.

19. In combination, in an impact crusher, an impeller and means for rotating it, said impeller having a plurality of axially extending sockets open at at least one end and bounded by spaced overhanging walls which define a space which decreases generally radially outwardly in width between such walls, and communicates with the exterior of the impeller, and impact members each including an axially extending bar having an impact face at one side thereof, and an impeller engaging portion at the opposite side thereof opposed to one of said overhanging walls, each said bar having a lug inwardly extending therefrom having enlarged faces engaging the opposed faces of the overhanging walls of one of said sockets, and normally centrifugally thrust into holding contact therewith when the impeller is being rotated, the minimum separation of the opposed walls of the sockets, at; the periphery of the impeller, exceeding the width of the lugs at that point, in a plane perpendicular to the axis of the impeller, the radial inward extension of said sockets exceeding the radial inward extension of the lug when the impact member is in operative position, and means for limiting the gravital inward movement of said bars and lugs towards the axis of the impeller when the impeller is not being rotated.

20. In combination, in an impact crusher, an impeller and means for rotating it, said impeller having a plurality of axially extending sockets open at at least one end and bounded by spaced overhanging walls which define a space which decreases generally radially outwardly in width between such walls, and communicates with the exterior of the impeller, and impact members, each including an axially extending bar having an impact face at one side thereof, and an impeller engaging portion at the opposite side thereof opposed to one of said overhanging walls, each said bar having a lug inwardly extending therefrom having enlarged faces engaging the opposed faces of the overhanging walls of one of said sockets, and normally centrifugally thrust into holding contact therewith when the impeller is being rotated, the minimum separation of the opposed walls of the sockets, at the periphery of the impeller, exceeding the width of the lugs at that point, in a plane perpendicular to the axis of the impeller, the radial inward extension of said sockets exceeding the radial inward extension of the lug when the impact member is in operative position,

the center of mass of the bar being located forwardly, in the direction of rotation of the impeller, in front of a radius passing through the center of the lug, whereby, in response to centrifugal force, the bar is urged against the side wall of the socket opposite to the impacting face of the bar, and means for preventing unintended endwise movement of the bars in relation to the impeller.

21. For use with the impeller of an impact crusher, an impact bar having a forward impacting face and one or more lugs extending from said bar, the area of connection between said lugs and said bar being spaced from the impact face of the bar, said lugs having enlarged portions, spaced from the bar, of substantially greater width in a plane perpendicular to the length of the bar than the portions of the lugs adjacent the bar which form the connection between the enlarged lug portions and the bar, the enlarged portions of said lugs having at each side concentric generally cylindrical faces, said faces being described about a common axis located exteriorly of the bar.

22. For use with the impeller of an impact crusher, an impact bar having a forward impac partially cylindrical face, said faces being concentrically described about an axis substantially displaced from the bar and parallel with the impact face of the bar and the axis of rotation of 5 the impeller, and facing toward the bar.

OSCAR C. GRUENDER.

WERNER.

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