US1276440A - Distributing mechanism for concrete-mixers. - Google Patents

Description

1. A. F. SVENSON. DISTRIBUTINGMECHANISM FOR CONCRETE MIXERS.

APPLICATION FILEDFEB. 16. 1918 I Patented Aug. 20,191&

4 SHEETS-SHEEN 1 J. A. F. SVENSON.

ms'umume MECHANISM FOR CONCRETE MIXEHS.

APPLICATION FILED YES. 16. 1918. I r Patented Aug". 20, 191.8.

4 SHEEFS-SHEEI 2.

WITNESSES gwww J. A. F. svfiwsowk DISTRIBUTING MECHANISM FOR, CONCRETE MIXERS.

APPLICATION FILED FEB. 16, IQIBA Patented A11g. 20, 1918.

4 SHEETSSHEET 3.

J. A. F. SVENSON.

, msmsaums MECHANISM FOR-CONCRETE MIXERS. APPLICATION FILED FEB-15. I918. 1 ,276,440, Patented Aug. 20, 1918.

4 SHEETS-SHEET M u M a ENTOR WITNESSES UNITED STATES JOHN A. r. svmvson, or PITTSBURGH, PEN

SCALE a SUPPLY comm, or rrr'rsr DELAWARE.

PA ENT. oFFi-on.

usrnvama, assrenon TO THE s'ramiaan momrnmvsnvema, A CORPORATION or DISTRIBUTING MECHANISM FOR CONCRETE-FIBERS.

Specification of Letters fate lit. Pilten ted Aug. 20, 1918.

Application m February 16, 1918. Serial No. 217,097.

To all whom it may concern: a I

Be it known that I, JOHN A. F. SvENsoN, a citizen of the United States, residing ,at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Distributing Mechanism for Concrete-Mixers, of which the following is a specification.

This invention relates to improvements in distributing mechanism for concrete mixers,

and has for its objects the provision of a on a street or other place where it is desired.

A further object .1s to so construct a distributing mechanism of this class that it may be removed from a mixing machine to facilitate the movement thereof from lace to place by removing a few bolts an uncoupling one shaft. therefore leaving the entire rigging intact and operat on of reassem ling the device.

Generally stated. the mechanism comprises an adjustable boom adapted to extend beyond a mixer, a hop or or receptacle supported on and movab e thereon and having a drop bottom and automatic control mecha nism for the drop bottom.

In the drawings:

Figure 1 is a side elevation of an apparatus embodying the invention;

Fig. 2 is an enlarged sectional detail view of a portion of the device showing the manner of adjustably supporting the boom, and the actuatin mechanism for the bucket supporting trol ey;

Fig. 3 is a horizontal sectional detail view on the line III, III of Fig. 2;

structure of this class which may,

eatly facilitating the thF-ilg. 4 is a fragmentary side elevation of the release mechanism of the hopper bottom; Fig. 5 is a view on the line V, V of Fig. 4-;

6 is'a view at right angles to Fig. 4;

opper or receptacle carriage, showing F1517 is a vertical sectional view on the line I, VII of Fig. 4; Fig. 8 is a detail view in side elevation of the control mechanism for the hopper bottom; 1

Fig. 9 is a top plan view; partly in sec tion, of the boom mounting and mechanism for imparting same;

Fi 10 is a side elevation of the same on the line X, X of Fig. 9';

horizontal movement to the Fig. 11- is a .vertical detail sectional view?" at the rear end ortion of the boom on the line XI, XI of ig. 2,, showing the means for mounting the guiding sheaves for thecables;

tracted sheave and its mounting at the end of the boom; and

Fig. 13 is a rear end view of the boom support showing a modified arrangement of adjusting cables.

Referring more particularly to the drawings, A designates a conventional form of mixer having a truck 10 and mixing drum 11 adapted to discharge through spout 12 Fig. 12 is a plan view of the'spring reand to be rotated by a gear 13 meshing with gearing 14 on the drum. The gear 13 is loosely mounted on a constantly moving shaft 15, and is engaged 'by a clutch 16 having operating lever 17 when it is desired to rotate the drum 12.

A supporting frame 18 is mounted on the truck and is provided at its forward end with a bracket or support 19 adapted to support the boom 20.

A socket member or cup 21 is mounted on the frame 18 and bracket 19 and is adapted to receive and support the ball member 22 of the boom hearing. The upper frame of ball bearing member 22 is secured to the boom 20 by bolts 2 passing through the webs of the boom channels and the front portions of bearing 34:, (Fig. 9). By reason of the ball and socket support,- boomh20 is allowed universal movement or adjgstment which permits unrestricted distribu tion of the mixed concrete, carried by the trollev and bucket, whether the ground be level or inclined.

The boom 20 is preferably of channel iron side members having their flanges turned inwardly to provide a track for the wheels of the traveling hopper carriage 24 supporting hopper 25.

The free end of boom 20 is adapted to be adjusted vertically by means of a suspension cable 26 secured by one end at 3 and passing around the anchor sheaves 28 mounted on supporting frame 2%? secured on frame 18, and leading to a winding sheave 2!. Cable 26 is adapted to be lengthened or shortened to lower or raise the boom 20 by being wound upon sheave 27 which is operated by means of hand wheel 30 connected by suitable Worm gearing to the shaft of sheave 27.

The frame of ball 22 is formed with a contrally arranged aperture or bearing adapted to receives bearing and mounting sleeve 32 extending downwardly from and formin a part of a drum 33. The ball 22 has its si e Wall flared outwardly to form a bearing flan e or partial drum 34, and has an upwar lly projecting sleeve 31 which forms a journal bearingfor drum 3.3. A second drum 35 is removably secured to the lower end of the sleeve 32 by key 36 or any other suitable means.

The sleeve 32 of the drum 33 is adapted to 10tatc freely within the jouinal bearing aperture 31 in the ball 22 and is operated by means of shaft 36 having a universal connection 37 therewith to allow for continuous rotation regardless of the position of the boom 20. The shaft 36 is detachably coupled to stub shaft 38 by coupling 39. Shaft 38 is supported in bracket 40 secured to frame 18 and has a beveled gear 41 on its upper end which is in mesh with gears 42 and 42' loosely mounted on shaft 48 which is mounted in suitable bearings 44 and 44. Shaft 43 receives its power from the constantly rotating shaft 15 on the mixer through sprocket and chain connection 45. Gears 42 and 4:2 transmit power from the shaft 43 to the shafts 38-136 by means of the friction clutches l6 and 47. respectively, which are connected by the lever rod 48 and operated by the lever 49. It will be readily understood that one of the gears will cause the shaft 3638, and consequently the drums 33 and 35, to rotate in one direction,

while the other gear will act to move these parts in the reverse direction when their respective clutches have'been moved into engaging position.

The hopper carriage 24 having Wheels 51 is mounted to travel on the boom 20 and has downwardly projecting spaced side portions 52 and 53. Transverse carrying truss members 54 are secured to the bottom of the carriage and support the hopper 25 which comprises a four walled receptacle, the back and side walls of which are preferably vertical with the exception that. they converge inwardly near the bottom. The front wall is directed upwardly on an angle from the bottom to form a receiving spout. The bottom of the hopper is a cone-shaped member 55, operating like the bell and'hopper of a blast furnace, adapted to be rcleasably held in position by means of a rod 56 mounted within sleeve 57 Which projects upwardly from the top of the cone bottom member. Rod 56 is provided with n cushioning spring 58 resiliently engaging the bottom 55.

Rod 56 is connected to a cable 59 trained over guide sheave 60 mounted in carriage 24. and over actuating sheave 61 to which it is secured.

Actuating sheave 61 is mounted on a spin die 62 (Fig. 7) in the frame of carriage 21 and has a projecting lug or tooth 63 thereon adapted to be engaged by the locking hook or dog 6% having a pivoted trigger projection 64 which is held in operative position by spring 65. Sheave 61 has aprojecting lug 66 on its inner face adapted to be engaged by a co-acting clutch or lug 67 on the cable-actuated sheave 68 mounted on the spindle 62.

The carriage 24 is adapted to be moved longitudinally of the boom 20 by means of a cable 69, secured to the lower drum 35, trained about guide sheave 70 and passing one or more times around the sheave 68, then directed along the boom 41nd over spring mounted sheave 71 at t-he forward end thereof,.and back along the boom to guide sheave 72 and upper drum 83.

The sheave 71 is mounted on a spindle 71 journaled in journal blocks 71" slidably mounted in slots 71 in brackets 71. The spindle 71 also passes through side bars 71 which pass through. cross bar 71 secured to the forward ends of the brackets 71 and have coiled springs 71' mounted therebeyond and bearing against said cross-head. Securing and adjusting nuts 71 are 'mounted on the terminal ends of the side bars 71' for tightening or loosening the tension of-such springs.

#The mounting of the sheave 71 as above described permits a flexible action of such sheave and also allows for the taking up of any slack in the cable 69 by means of the adjusting nuts 71 and the tension of the coil springs 71. i For the purpose of equalizing the distribution of the cable on drums 33-65 eachis provided with a. spiral groove, one right and the other left hand, so that the cable will wind and unwind uniformly as to each gether.

drum, 2'. 6., the u per and lower strands will approach towar and move from the horizontal center of the compound drum to- Guide sheaves 70 and 72 are rotatably mounted on elongated spindles 1) secured in frames 0 and the sheaves as thus mounted are free to rotate and rise or fall with the cable as it ascends or. descends the grooved peripheries of the drums 33 and 35. It will thus be seen that upon the rotation of the drums 3335 in one direction the carriage will be pulled by one drum longitudina-lly of the boom, the cable being paid out by the other drum. On outward movement of the buggy, the sheave 68 is held against rotation by the lug 67 engaging the lug 66 on the sheave 61, which sheave is held against rotation by the hook 64.

p The hopper bottom 55 is adapted to be released by suddenly reversing the movement of the cable 69 by winding it upon the drum 35. This will cause the sheave 68 to herevolved in an opposite direction so as to disengage the lug 67 from contact with lug 66 and cause the lug 67 to strike the trigger 64 of catch 64, thereby releasing said catch from engagement with the stop or tooth 63 on the sheave 61. When sheave 61 has been released itwill revolve due to the pull on the cable 59 of the load on bottom 55. The movement of the sheave 61 in lowering the bottom'is limited by stop 73 which extends 'from the buggy frame into the path of and is engaged by the lug or tooth 63.

After the load has been discharged, the drums are again rotated to continue winding the cable upon drum 35 to bring the hopper back for a fresh load. This tends to revolve'the sheave 68 but as the weight of the bottom exerts a restraining tension on the cable, it ordinarily prevents the rotation of sheave 68 while its lug 67 engages lug 66 of the'winding sheave 61.

he hopper bottom 55 remains inits lowered position until the hopper reaches its extreme rear loading position, indicated in dotted lines Fig. 1, at which point the hopper carriage will strike 'abumper or stop 74. When? the hopper carriage is thus arrested against the bumper 74, the continued winding of-the cable 69 upon the drum 35 will revolve the sheave 68.causing the lug 67 to engage. lug 66 on sheave 61 and thus rotate the sheave 61 back to its normal position, where it will be held by the engagement of the hook 64 on the lug 63. It will, of course, be understood that the cable 59 will be wound upon the sheave 61 when it is thus returned to its initial position and the bottom 55 will thereby be -raised, as in Fig. 2.

The boom 20 is adjustable laterally to allow for a wide distribution of mixed concrete, by means of the hand wheel 7 5 which the carriage outwardly of the is connected to threadedshaft 76 mounted in bearings 77 on the frame 18 and having a movable block 78 thereon. A cable 79 is secured at its center to the block 78, trained about sheaves 78, and its ends are passed around an enlarged rounded exterior hearing face of bearing flange 34 in opposite directions and are secured thereto as indicated at 5. By this means the boom is swung around in one direction or the other, and any slack in the cable may be taken up by the nut and bolt terminal connections shown. V

InFig. 13 I have shown a modified arrangement of the adjusting cables for moving the boom 20 laterally to provide for equalization of the pull of the cables in either direction. Cables 79 and 7 9 are ar- "ranged in pairs as shown, and are secured in spaced relation at their center to the block 78 as already described. By this means, the outermost cables pull equally and avoid any tilting tendency.

The operation of the device in detail is as follows: The parts being assembled in operative position with the hopper 25 at its rearmost position, mixed concrete from the mixing drum 11. is discharged by the drum chute 12 into hopper 25; when the hopper is filled the lever 49 is operated to engage the and hopper 25 outwardly on the boom 20.

Then the hopper has reached the desired position, lever 49 is suddenly reversed, disengaging one clutch as 46 and momentarily engaging the other clutch 47 on gear 42,

thereby causing a sudden reverse movement of the cable. This will cause the sheaves 68 to be reversed and its lug 67 to strike the trigger 64 of the hook 64, thereby releasing such hook and allowing thebottom-supporting sheave 61 to rotate until the 111 63 engages stop 73, thereby lowering the ottom 55 (Fig. 8).

Re-engagement of the clutch 47 and its continued application will cause the carriage 24 and hopper 25 to move rearwardly on the boom 20 until the carriage strikes the stop 74 when the carriage will stop. Cable 69 will continue to move, however, revolving ,the sheave 68 1n the opposite direction,-

59 and raising the bottom 55, and brin%ing lug 63 again under locking hook 64 4). Upon again reversing lever 49, drum 33 will wind on cable 69 tendin to draw beam, but

sheave 68 will revolve inoperatively until lug 67 is swung around and comes into oontact with the opposite side of lug 66, as in Fig. 4. Thereupon, stop 63 being engaged by the shoulder 64, neither sheave can rotate and the cable will act to draw the carriage outwardly of the beam.

Trigger 64* being s ring-retracted will rise to allow passage 0 lug 67 and will resume its position for operation to unlock the sheave as already described.

Should. any of the concrete stick around the bottom 55, it will not revent sheave 61 from being rotated a su cient distance to engage lug 63 under catch 64 since the cable 59 is secured to the rod 56 which has a cushioning connection with the bottom 55 due to the spring 58.

It will be understood that the carriage 24 may be reversed to move rearwardly without necessarily discharging the material in the hopper 25. This is accomplished by slowly and lightly engaging the clutch men'n her 47 on gear 42'. The tension of the spring 65 is of such strength that unless the hook 64 receives a sudden and severe stroke such hook will not be disengaged from the lug 63.

While I have shown a referred embodiment of my invention, I 0 not wish to be limited to the exact construction shown, since various changes in design and details of construction may be made by one skilled in the art without departing from the spirit of my invention as defined in the appended claims.

1. In combination with a socketed bearing, a distributing boom having a partly spherical member seated in said bearing, a carriage and hopper carried by the boom, means for imparting movement to the carriage em bodying winding drum mechanism journaled in'said member, and means for swinging the boom laterally on said bearing.

2. In combination with a socketed hearing, a distributing boom having a partly spherical member seated in said bearing, a carriage and hopper carried by the boom, means for imparting movement to the carriage embodying winding drum mechanism journaled in said member, and means for swinging the boom laterally and for raising and lowering it on said bearing.

3. In combination with a socketed bearin a distributing boom having a partly sp erical member seated in said bearing, a

carriage and hopper carried bythe boom,

a pair of winding drums having a portion extending through said partly spherical member, a cable connected with the carriage engaging a terminal sheave wheel and adapt-,

ed to be wound and unwound by said drums, and means for rotating said drums in either direction.

e. In combination with c socketed bearing,

a distributing boom having a partly spherical member seated in said bearing, a carriage and hopper carried by the boom, a pair of winding drums having a portion extending through said partly spherical member, a cable connected with the carriage engaging a terminal sheave wheel and adapted to be wound and unwound by said drums, a driving shaft havin universal connection with said drums, and means for actuating said shaft in either direction.

5. In combination with a socketed bear ing, a distributing boom having a terminal spring retracted sheave wheel and a partly spherical member seated in said bearing, a carriage and hopper carried by the boom, a pair of winding drums having a portion extending through said partly spherical member, a cable connected with the carriage engaging said terminal sheave wheel and adapted to be wound and unwound by said drums, a driving shaft having universal connection with said drums, and means for actuating said shaft in either direction.

6. In combination with a socketed bearing, a distributing boom having a partly spherical member seated in said bearing, a carriage and hopper carried by the boom, a pair of winding drums having a portion extending through said partly spherical member, a cable connected with the carriage engaging a terminal sheave wheel and adapted to be wound and unwound by said drums, a driving shaft having universal connection with said drums, and a shaft geared with said shaft and provided with reversible clutch mechanism.

7. In combination with a socketed bearing, a distributing boom having a partly spherical member seated in said bearing, a carriage and hopper carried by the boom,

a pair of winding drums having oppositely disposed spiraligrooves and a hollow cylindrical connecting portion extending through said partly spherical member, a carriage actuating cable having its terminals connected with said drums. slidably mounted uide sheave for the cable, and a reversile power driven actuating shaft connected with said cylindrical connecting portion by a universal joint.

8. A universally adjustable distributing boom for a concrete mixer having a drop bottom hopper, a supporting carriage therefor, a raising and lowering sheave wheel thereon having a flexible connection with the hopper bottom, a co-acting sheave, a winding drum, and a cable connected therewith and woundupon said co-acting sheave whereby to provide forimparting movement to the carriage and also to theco-acting sheave to raise or lower the hopper bottom. 9. A distributing boom for aconcrete mixer having a longitudinally traveling carriage, a hopper depending therefrom pro vided with a closing bottom, a revoluble sheave on the carriage having a cable connected to the hopper bottom, a double winding drum, a relatively movable member on the carriage adapted to actuate the revoluble sheave, and ,a carriagepropelling cable connected with-the winding drum and operativel engaging said relatively movable mem er.

10. In combination with a concrete mixer having a supporting frame provided with a universal bearing support, an inter-fitting ball bearing member therein having a partly rounded outer portion and a fixedlv attached distributing boom, a swinging cable passing in opposite directions around said outer portion and secured thereto and connected with adjusting mechanism, a carriage supported by said boom having a distributing hopper, a pair of winding drums having a portion rotatably mounted within the ball bearing member, means for actuating said drums in either direction, and a cable having its ends connected with said drums and engaging a portion of the carriage between it ends.

11. In combination with a concrete mixer sheave controlled therebyfor causing a disthereby for lowering the hopper bottom to discharge the contents thereof.

15. A distributing mechanism for concrete mixers comprising a boom having universal;

movement with respect to the mixer, a carriage movable along said boom provided with a hopper having a drop bottom, a cable operable in reverse directions to impart movement to said carriage, and means oper' ated by said cable for lowering the hopper: bottom to discharge the contents thereof. and for raising the hopper bottom toclosed position, consisting of a. bottom supporting fcable'and sheave and a co-aeting sheave engaged by the carriage moving cable.

having a supporting frame provided with universal bearin support, an interfittingf ball bearing mom or therein having a partly? rounded outer portion and a fixedly at: tached distributing boom, a swinging cable= passing in opposite directions around said outer portion and secured thereto and connected with adjusting mechanism, a carriage supported by said boom havin a-distributing hopper, a. pair of winding ruins havin a portion rotatably mounted within the ba bearing member, means for actuating said drums in either direction, means for opening and closing the hopper supported on the carriage, and a cable having its ends connected with said drums and engaging said hopper opening and closing means between its ends.

12. A distributing mechanism for concrete mixers comprising a boom having universal movement with respect to the mixer, a carriage and hopper movable along said boom, means 'for moving said carriage, and mechanism embodying a sheave operated by the carriage moving means and a supporting sheave and cable controlled thereby for causing a discharge of material from said hopper.

13. A distributing mechanism for concrete mixers comprising a boom having universal movement with respect to the mixer. a carriage and hopper movable along said boom. a cable operable in reverse dircctions to impart corresponding movement to said carriage. and means ci'nbodying a sheave operated by said cable and a cable-mpporling 16. In a distributing apparatus for concrete mixers, the combination with a boom having universal movementwith respect to the mixer, drums on said boom, and-a cable trained along said boom and connected to said drums, of a carriage and dumping bucket mounted on said boom and movable longitudinally thereof, said carriage being connected with and adapted to be moved by said cable, said bucket having a drop bottom, and a air of sheaves on said carriage for releasab y supporting said bottom, one of said sheaves being operated by the reverse movement of said cable.

17.111 a distributing apparatus for mixing machines, a boom, a carriage movable along said boom provided with a hopper having a drop bottom, a drum actuated cable operable along said boom toimpart movement to said carriage, and means adapted to be operated b said cable for re leasably supporting said ottom, comprising a sheave .wheel journaled insaidcarriage and having a flexible supporting member arranged to travel in the same annular path.

and a locking dog engaging said first named sheave adapted to normally hold it against rotation. said dog being'adapted to be released by thecngagcment therewith of the lug on said second named sheave when said cable is reversed.

18. The combination with a mixing machine comprising a base. a mixing drum. :1

crmtinuously rotating shaft on said base and "ing said drums, a stub shaft mounted in said frame and connected with said first named shaft, clutch and gear connection between said second named shaft and said stub shaft, a cable trained along said boom and secured to said drums, a carriage movable "al ong'said boom, a hopper secured on said carriage having a drop bottom, a pair of sheave wheels secured on a shaft carried by said carriage, a flexible supportlng mem- 'ber secured to said drop'bottom and to one of said's lieaves, each of said sheaves having a lug adapted to travel in the same annular path, a locking dog adapted to engage a proection on the sheave having the supporting member thereon to hold it against rotation, the other of said sheaves being adapted to be rotated by the forward movement of said cable until said lugs engage each other and to rotate in the reverse direction when said cable is reversed, whereby to release the looking dog to permit the drop bottom to fall. 19. The combination with a mixing machine having a su porting frame, and a projecting bracket t ereon, of a boom having universal movementwith respectto said machine, a pair ofdrums journaled on said boom, a shaft having a universal connection with said drums, a clutch and gear connection for said shaft adapted to connect it with a sourceof power, a cable trained along said boom and secured to said drums, a carriage movable .alo said boom, a hopper secured on said carriage having a dro bottom a pair of sheave wheels scour to a shaft journaled within said carriage, means secured to one ofsaid sheaves supporting the drop bottom, the other of said sheaves being operatively connected with said cable, means or looking said sheaves against rotation when said carriage is moved in a forward direction, and means for releasing said sheaves to permit a limited reverse movement when said cable is reversed thus per- 'mitting said bottom to drop.

20. The combination with a mixing machine having a supporting frame, and a pro- 'ecting bracket thereornof aboom havin a all and socket connection 'With said brac et to allow for universal movement, means for moving said bqim on a horizontal plane,

' ,other means for moving said boom vertically, a air of drums journaled on said boom, a sliaft having a universal connection with said drums, a clutch and gear connection for said shaft adapted to connect it with a source of power, 'a cable trained along said boom and secured to said drums, a carriage movable along said boom, a hopper secured on said carriage having a drop bottom, a pair of sheave wheels secured to a shaft journaled within said carriage, means secured to one of said sheaves supporting the drop bottom, the other of said sheaves being operatively connected with said cable, means for locking said sheaves against rotation when the carriage is moved in a forward direction, and means for releasing said sheaves to permit a limited reverse movement when said cable is reversed thus permittin said bottom to drop.

21. The com ination with a mixing machine having a supporting framework, and.

bottom of the hopper, and a controlling operated by sheave therefor adapted to be said carriage moving cable.

22. The combination with-a mixing machinehavin a supporting frame arra ed thereon, an a bracket supported on the orward end of said frame; of a distributing apparatus comprising a boom mounted on said bracket and having universal movement with respect to said mixer, a carriage and hopper movable along said boom said ho per having a drop bottom, a'ca'ble operab e along said boom to impart movement to said carriage, and means ada ted to be operated by said cable for releasa ly supporting said bottom, said means comprising a sheave wheel journaled in said carriage and having a flexible suipporti member secured thereto and to sai drop ottom, a second sheave wheel joilirnaled within sgid 'pfirrizige and operativuy ngagi sai ca e u s on each of said sheave i vieels arran ed to ravel in the-same annular path, and a ocking dog engaging said first named sheave wheel adapted to normally hold it against rotation, said dog being adapted to-be released by the engagement therewith of the lug on said 'second named sheave wheel when said cable is reversed.

23. The combination with a mixing machine having a' supporting frame thereon; of a distributing apparatus su ported on said frame and having. universaFmovement with respect thereto, a pair of drums mounted on said boom, a cable secured to one of said drums and trained along said boom and back over the same and adapted to be wound upon the other of said drums, a carriage movable along said boom and connected with said cable, a hopper supported on said carriage and having a dro bottom adapted to be supported by a flexi 1e member passing over a sheave jpurnaled insa d carriage, a second sheave 1ourna1ed within said carriage adapted to be moved by said cable, means for normally holding said sheaves against rotation, and means for re- 10 leasin said sheaves when said cable is operate in the reverse direction to allow said drop bottom to operate.

In testimony whereof I hereunto afiix my signature.

JOHN A. F. SVENSON.

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