US3292195A

US3292195A - Street sweeping machine

Info

Publication number: US3292195A
Application number: US387905A
Authority: US
Inventors: Robert F Schmidt; Henry A Leidecker
Original assignee: Elgin Sweeper Co
Current assignee: Elgin Sweeper Co
Priority date: 1964-08-06
Filing date: 1964-08-06
Publication date: 1966-12-20
Anticipated expiration: 1983-12-20

Description

DeC- 20, 1956 R. F. SCHMIDT ETAL 3,292,195

STREET SWEEPING MACHINE 5 Sheets-Sheet 1 Filed Aug. 6, 1964 INVENTORS jiojef /cizzz Hezzfg.lejzzieae DeC- 20, 1955 R. F. scHMxDT ETAL 3,29295 STREET SWEEPING MACHINE Filed Aug. g, 1964 5 Sheets-Sheet INVENTORS o re/Mada' y HezzfyLcjzfdee/ef DeC- 20, 1966 R. F. SCHMIDT ETAI. 3,29295 STREET SWEEPING MACHINE Filed Aug. a, 1964 5 Sheets-Sheet .71

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@ q E E (ymrrn/NEYS Dec 20 1955 R. F. SCHMIDT ETAL 3,292,95

STREET SWEENG MACHINE Filed Aug. 1;, 1964 5 Sheets-Sheet 2 I NVENTORS United States Patent O 3,292,195 STREET SWEEPING MACHINE Robert F. Schmidt, Elgin, and Henry A. Leideclrer, Wheaton, lll., assignors to Elgin Sweeper Company, Elgin, Ill., a corporation of Delaware Filed Aug. 6, 1964, Ser. No. 387,905 Claims. (Cl. 15-87) This invention relates to street sweepers of the type having one or more side brooms or brushes for sweeping litter from gutters or out of depressions in the road or from against walls into the path of the main transverse broom. The present invention is more particularly directed to a new and improved suspension system for the side broom or brooms upon such machines.

It is one of the principal objects of the present invention to provide a new floating suspension for a side broom of a street sweeper which will permit the broom to travel in an irregular path so as to be able to follow an irregular road contour and to effectively sweep the bottoms of depressions in the roadway as well as along the general level of the roadway without substantially affecting the operation of the machine.

Still another important object of this invention is to provide a new and improved mounting for a side broom of a street sweeper permitting the side broom to move up and down in a straight line rather than in an arc in order to maintain a more advantageous fixed relationship between the side broom and the pavement or roadway.

According to important features of this invention, the side broom moves up and down in a straight line because of parallel action of a pair of arms from which lthe side broom is suspended.

Yet another principal object of this invention is to provide a new and improved mounting for a side broom that permits the side broom to hit and clear a fixed obstacle and to automatically return the side broom to its original sweeping position after the obstacle has been passed.

A further object of this invention is to provide a new and improved mounting for a side broom permitting the side broom to move up and down as an integral unit that eliminates any binding action of a side broom disk sliding on a splined type shaft under torque load of the type previously employed in this industry.

Another and still further object of this invention is to provide a new and improved control for the side broom whereby the proportion or ratio of weight supported by a broom-suspension spring can be hydraulically adjusted by the operator in a -cab rather than manually adjusted outside of the cab.

According to more specific features of this invention, the street sweeper is provided with a body, a first arm is pivotally movable on the body, means is provided for suspending a side broom from the first arm as an assembly enabling the side broom to move up and down as the first arm is pivoted, means is provided for rotating the side broom, a codirectional second arm is pivotally mounted on the body for unison movement with the first arm, resilient means is carried by the second arm, a cable is joined with the resilient means at one end and to the assembly at an opposite end providing a resilient suspension for controlling the load of the side broom on a ground -or road surface, and means is connected with the second arm for simultaneously rotating the iirst and second arms in coordinated relation and for causing the side broom to move into and out of contact with a road surface.

Other objects and features of this invention will more fully become apparent in View of the following detailed description taken in conjunction with the accompanying 3,292,195 Patented Dec. 20, 1966 lCC drawings illustrating therein a single embodiment and in which on the drawings:

FIGURE 1 is a side elevation of :a -street sweeper;

FIGURE 2 is an enlarged fragmentary side elevation with parts shown in section and with certain other components shown in full and dotted lines to illustrate the position of the side broom and the supporting suspension in elevated Vand in sweeping position;

FIGURE 3 is an enlarged fragmentary front elevation of the side broom illustrating in full and dotted lines the manner in which the side broom can move in and out relative to an abutment;

FIGURE 4 is an enlarged fragmentary cross-sectional View with parts shown in elevation as taken on the line IV-IV looking in the direction indicated by the arrows as shown in FIGURE l; and

FIGURE 5 is an enlarged fragmentary cross-sectional view taken substantially on lthe line V-V looking in the direction indicated by the arrows as seen in FIGURE l.

As shown on the drawings:

The reference numeral 10 designates a self-propelled street sweeper. The sweeper 10 includes a body 11 mounted on front and rear wheels 12 and has a dirt hopper 13 disposed at a forward end of the sweeperv body. Mounted beneath the sweeper body is a main broom 14 which has dirt deflectors 15 disposed at opposite sides for directing the sweepings into the path of the main broom 14. Mounted forwardly of the main broom 14 is a conventional Itype conveyor 16 for transporting sweepings swept from the main broom to the dirt hopper 13. According to important features of this invention, a side broom unit or assembly 17 is suspended from one side of the body 11 in a manner which will now be explained in further detail. If desired, the side broom units can be disposed at both sides of the body to sweep dirt from gutters and the like into the path of the main broom.

A jack shaft 18 is driven by a power transfer unit (not shown). T he jack shaft 18 serves -to drive the main broom 14 through sprockets of the type shown at'19 and a chain 20. A side broom arm 21 is provided with a sleeve 22 rotatably or pivotally mounted on a body sleeve 23 carried by sweeper side body plate 24. The side broom arm 21 further includes a gear housing 25 disposed'at an opposite end of the arm 21. The housing 25 is linked with the arm sleeve by a side broom chain guard 26 which includes a pair yof spaced guard plate 26a- 26a (FIGURE 5). The side broom assembly 17, including side broom 28, is pivotally mounted by means of pivot pins or screws 29-29 to a lower end of the gear housing 25. In order to drive the side broom 28, a drive is provided for coupling the side broom 28 with the jack shaft 18. This drive includes a sprocket 30 mounted on the jack shaft 18 coaxially within the 'arm and body bearing sleeves 22 and 23. A roller chain 31 is trained over the sprocket 30 as well as over chain idler 32 that is suspended from the side broom guard plate 26a. The sprocket 30 can be secured in any suitable manner on the jack shaft 18 such as by means of bushing 33 keyed at 34 to the shaft 18 and keyed to the sprocket at 35.

An input shaft 36 is .supported on bearings 37--37 on confronting walls 38-38 of the gear housing 25. Another sprocket 39 is housed within sprocket housing 27 and is attached t-o the input shaft 36 and the chain 31 is trained thereover. Also carried on the input shaft 36 is a pinion bevel gear 40 that is in mesh with a bevel gear 41 carried on vertically extending output shaft 42 (FIGURE 5). The pivot gear housing 25 is pivotally mounted on the arm 21 by means of bearings 25', which may be of any suitable type, for permitting the side broom to pivot and swing back and forth in a longitudinal 'direction when the side broom strikes an abutment.

Positioned below the gear housing 25 is a pivot gear housing 43 and it will be noted from FIGURE 4 that the ou-tput shaft 42 is supported by

bearings

44 and 45 on the walls of the gear housing 25. A lowermost end 42a of the output shaft 42 extends into the pivot gear housing and is pivoted by means of a universal joint 46 to drive shaft 47` comprising a component of the side broom assembly 17. According to certain features of this invention, a side broom sleeve housing 48 encases the drive shaft 47 and

bearings

49 and 50 support the drive shaft 47 thereon. The bearings may be of any suitable type such as roller bearings and suitable seals such as

seals

51, 52 and 53 can be provided for protecting these bearings,

In order to permit the side broom assembly 17 to pivot in and out relative to the body plate 24, the side broom sleeve housing 48 is carried on the pivot gear housing 43 by means o f the screws or pivot pins 29-29. The side broom 28 will, of course, swing in the same arc as the drive shaft 47 as it is rotated. The side broom 28 includes a wire brush 28a carried on segments 54 bolted to a side broom disk 55. A drive hub 56 is suitably attached to the disk 55 and -to a lower end of the drive shaft 47.` Means 57 are provided to permit the side broom unit 17 to move automatically in and out when an outside edge of the side broom 17 strikes a curb or the like forcing the side broom -transversely toward the sweeper 10. As illustrated, the means 57 include a rod 58 that is anchored by an elastic stop nut59 (FIGURE 3) to an integral eX- tension 60 of the sleeve housing 48. A spring 61 is mounted on the rod 58 to permit the side broom 17 to spring back after striking a curb as is shown inFIGURE 3. The opposite end of the rod has a head 62 securing it with an extension 43a (FIGURE 3) of the gear housing 43. The tension on the spring 61 Vcan be adjusted by turning of the stop nut 59.

According to still other features of this invention, and

in order to provide fore and aft protection, arm means t 65 (FIGURE 2) are provided to permit the broom 17 to automatically return to its preset position after the broom strikes an abutment during the forward travel of the sweeper 10. This means 65 permit the broom to ride up and over the fixed abutment and to return to its original position without any manual adjustment. The means 65 include a piston Vrod 66 pivotally secured at 67 in spacedrelation below the shaft 18 to the side plate of the sweeper 10. A cylinder 68 longitudinally slidably` encloses the piston and a compression spring 69 is provided to thrust at one end against the piston and at its opposite end against the head end of the cylinder for urging the broom 17 in a forward direction.

When the broom 17 strikes a fixed abutment during its forward travel, the spring 69 is compressed and the broom -rides upwardly and over the abutment and then returns to its original position after passing over the abutment. The head end of the cylinder 68 is pivotally joined at 70 with the side broom unit in parallel relation to the arm 21 and cooperates therewith in parallelogrammatic relation to permit the side broom unit 17 to move freely up and down. No manual 'adjustment is required to adjust the position of the side broom after an abutment has been struck. An adjustment nut 71 is provided on a threaded end 66a of the rod 66 to permit the angular relationship of the broom assembly 17 and theA .ground S to be adjusted.

According to further important features of this invention, a oating suspension is provided for the side broomV arm 21 and for the side broom unit 17 so -that when the side broom is lowered into a sweeping position, at least a portion of the side broom is supported on a cement or road surface S. By this construction, when the street sweeper travels over or adjacent to a road depression, the side broom unit 17 can freely move into the depression and out of the depression yfor eiectively sweeping level as well as irregular road surfaces.

To this end, a second cylindrical control arm 72 is pivotally mounted on an arm pivot 73 adjacently spaced above the shaft 18 in c-odirectional Vrelation to the arm'21. Mounted within the cylindrical arm 72 is a threaded arm broom 17 is adapted to be supported by the spring 75` carried by the cylindrical arm 72 while the remainder of the weight of the arm 21 and the side broom 17 is supported on the ground surface S when the side broom 17 is in a sweeping position. As the sweeper is moved over a 1 ground surface, the side broom 17 sweeps` over the ground `surface and can drop into any depression `in the road surface for sweeping the same and then automatically moves out of the depression in `continuing contact with the road surface without the necessity of any manual adjustment.

The tension of the spring 75 can be controlled to limit t the load of the wire broomv on a ground surface by4 It will be peri ceived that the adjustment nut 78 is disposed exteriorly t of the cylindrical arm 72 andis cooperable with the pivoted end surface thereof to maintain the spring in a 1 manipulation of the adjustment nut 78.

longitudinally controlled position within the cylindrical arm 72. v

Actuating means 79 are provided for suspending the i

codirectional arms

21 and 72 in various controlled posi-` tions as determined by the operator in the cab of ther sweeper.

are provided in the operators cab to permit the side broom 17 to be moved into and out'of sweeping: position. An important advantage of the new actuating means 79 As illustrated, the actuating means comprise a hydraulic cylinder 80 and suitable controls (not shown)` is while it is operable to raise .and lower the broom assembly 17 it also functions to control the proportion or ratio of weight supported by the spring 75 in accordance 1 with -the hydraulic setting of the means 79 by the.l operator in `the cab. Thus, the operator is enabled to manually adjust lthe percentage -of load carried` by the spring directly from the cab whereby the` sweeper can be continuously operated without interruption. the .body plate 24 in adjacently spaced relation above the pivoted end portion of and in codirectional relation with respect to the second arm 72. The hydraulic cylinder is,

provided with a piston rod 80a `that isA pivotally,y joined at 82 to an upward ear extension 83 on the freey end portion of the second arm 72.

Control means 84 are provided for limiting the stroke of the hydraulic cylinder 80 so that the operators controls (not shown) can be operated in such a way that the side broom 17 can be moved into a given sweeping position` Control means 84 include a threaded rod 85 that is pivotally;

or elevatedinto a given road travel position.

joined at 86 to the upper end of the extension 83. The threaded rod 85 is further carried on a guide 87 supported on the cylinder 80. An adjustment nut or stop `88 is` adjustably positioned on the threaded rod 85 for coaction with the guide 87 to enable the side broom 17 to be` positioned in a predetermined sweeping position. When the controls for the hydraulic cylinder 80 are operated,

the piston rod 80a can be oper-ated Vto cause the second arm 72 to pivot on its pivot 73 for effecting up and down movement of the side broom 17 and of the arm 21.

Operative when the side broom 17 is disposed in a road and on the cable 77. When the side broom 17 is moved into a sweeping position, the chain 89 becomesk slack The cylinder is pivotally connected at` 81 to Y since the spring 75 4and the cable 77 do not serve to support the load of the arm 21 and the side broom 17 on the arm 72. This chain 89 is connected at one end with the lower arm 21 and is connected at an opposite end with the upper arm 72.

A pair of arm guides 90 and 91 are suitably secured to the body plate 24 and an extension 92 of the arm 21 is engageable behind the arm guides 90 and 91 to insure that the arm 21 as pivoted is movable generally in a vertical plane.

By providing the new suspension, above described, the side broom can be moved up and down in a straight line because of the parallelogrammatic action of the arms 21 and 65 and so that it is not necessary for the side broom to move up and down in an arc. Where the side broom is moved up and down in an arc, a fixed relationship between the side broom wire and the pavement cannot be readily maintained.

Although minor modifications might be suggested by those versed in the art, it should be understood that we wish to embody Within the scope of the patent warranted hereon, all such modifications as reasonably and properly come within the scope of our contribution to the art.

We claim as our invention:

1. In a street sweeping machine,

a body,

a first arm pivotally mounted on the body and movable in an arc relative to the body,

a side broom carried on said rst arm as an `assembly and movable with said arm,

means for rotating said side broom,

means for floatingly suspending said `assembly in a sweeping position enabling the side broom to follow an irregular road surface and to sweep level surfaces as well as depressions,

means for raising and lowering said side broom into and out of sweeping position, and

a second arm pivotally mounted on the body and pivotally connected to said assembly and cooperative with said first-mentioned arm in parallelogrammatic relation for controlling the assembly to move in substantially straight line up and down.

2. In a street sweeping machine,

a driven shaft,

a rst arm pivotably movable in an arc on the axis of said driven shaft,

a side broom,

means suspending said side broom from said rst arm as an assembly,

means connecting said Vdriven shaft with said side .broom for rotation of the same,

a second arm pivotally mounted for generally codirecltional movement with said rst arm,

resilient means carried by said second arm,

a cable joined with said resilient means at one end and to said assembly at an opposite end enabling the first arm and side broom to be resiliently suspended from said second yarm for controlling the load of the side broom on a ground surface,

and means connected with said second arm for rotating said second arm and with said first arm through its resilient suspension being contemporaneously movable in generally codirectional relation with said first arm for movement of said side broom into and out of contact with a ground surface.

3. In a street sweeping machine,

a driven shaft,

a side broom,

means coupling said side broom wth said driven shaft,

a rst pivot means supporting said side broom for back and forth longitudinal swinging movement and a second pivot means supporting said side broom for in and out transverse swinging movement,

yieldable means for maintaining said side broom in va given sweeping position and for permitting the side broom to swing longitudinally back and forth on said pivot means vin line with the path of travel of the machine to clear a fixed abutment and for returning the side broom to said given sweeping position,

yieldable means for maintaining said side broom in said sweeping position and for permitting the side broom to swing transversely in and out on said pivot means and for returning said side broom to said given position when the side broom is moved after striking a curb and the like, and

means for moving the `side broom vertically in a substantially straight 'line into and out of said sweeping position.

4. In a street sweeping machine,

a body,

a Ifirst arm pivotally mounted on said body and move- -able up and down in an arc,

a side broom carried on said first arm as an assembly,

means for rotating said side broom,

a second arm pivotally mounted at one end on said body,

spring means carried lby said second arm,

a cable joined at one end with said spring means and at an opposite end with said iirst arm providing Va oating suspension for said first arm and said side broom enabling the side broom to be engaged against a surface to be swept and enabling the side broom to drop into road depressions to sweep level surfaces yas well as depressions, and

means operatively connected with said second arm for pivoting said arms up and down in codirectional relation for raising and lowering said side broom into and out of sweeping position.

5. In a street sweeping machine,

a body,

a first arm pivotally mounted on said body Iand moveable up and down in an arc,

a side broom carried on said first arm as lan assembly,

means for rotating said side broom,

a second arm pivotally mounted at one end on said body,

spring means carried by said second arm,

a cable joined at one end with said spring means and at an opposite end with said first arm providing a iioating suspension for said first arm and said side broom enabling the side broom to be engaged against a surface to be swept and enabling the side broom to drop into road depressions to sweep level surfaces as well as depressions,

means operatively connected with said `second arm for pivoting said arms up and down in codirectional relation for raising and lowering -said side broom into and out -of sweeping position, and

guide means cooperable with said side broom insuring that said brooms move up and down in a substantially straight line.

6. In a street sweeping machine,

a body,

a first arm pivotally mounted on said body and moveable up and down in an arc,

a right vangle drive housed in lsaid first arm,

a side broom carried on said first arm and in driving engagement with said right angle drive,

a second arm pivotally mounted at one end on said body,

spring means carried by said second arm,

a cable joined at one end with said spring means and at an opposite end with said first ar-m providing a floating suspension for said iirst arm and said side broom enabling the side broom to be engaged against a surface to be swept and enabling the side broom to drop into road depressions to sweep level surfaces as well as depressions,

means operatively connected with said second arm for pivoting said arms up and down in codirectional readjustable stop means operatively connected with said means for limiting upward and downward movement Iof said side broom.

7. In a street sweeping machine,

a body,

a first arm pivotally mounted on said body and moveable up and down in an arc,

a side broom carried on said first arm as an assembly,

means for rotating said side broom,

a second arm pivotally. mounted at one end on said body,

spring means carried by said second arm,V

a cable joined at one end with said spring means and at an opposite end with said first arm providing a oating suspension for said iirst arm and said side broom when said side broom is in a sweeping position en- -abling the side broom to be engaged against a surface to be swept and enabling the side broom to drop into road depressions to sweep level surfaces as well as depressions, and

a chain joined with said arms for suspending said first arm from said second when said side broom is sustained in an elevated road travelling position and with said cable means operatively connected with said second arm for pivoting said arms up and down in codirectional relation for raising and lowering said side broom into'and out of sweeping position.

8. In a street sweeping machine,

a body,

a first arm pivotally mounted on said body,

a side broom unit pivotally carried on pivot means on said first arrn as an assembly and including a side broom and a driven shaft connected thereto,

a universal joint joined to said driven shaft,

a drive for rotating said side broom carried by said first arm and joined to said universal joint, a second arm pivotally mounted attone end on said bodyk and which is codirectionally movable with said lirst arm,

means for actuating said second arm pivotally,

means joining said rst arm to the second arm for movi ing it and said broom with it into sweeping and road travel position, and

an arm pivotally mounted on said body and pivotally connected to said broom unit in parallelogrammatic relation to said rst arm and including yieldable means for maintaining said side broom in a given sweeping position and for permitting the side broom to swing longitudinally back and forth on said pivot means in line with the path Vof travel of the machine to clear a xed abutment and for returning the side broom to said given sweeping position.

9. lIn a street sweeping machine,

a body,

an arm pivotally mounted on said body,

a side broom unit pivotally carried on pivot means on said arm as an assembly and including a sidebroom and a driven shaft connected thereto,

a universal joint joined to said driven shaft,

a drive for rotating said side broom carried by said arm and joined to said universal joint,

means joined with said arm for moving it into sweeping and road travel position, and

yieldable means for maintaining said side broom in said sweeping position and for permitting the sidebroom to swing transversely in and out about said universal joint and for returning said side broom to said given position when the side broom is moved after striking a curb and the like.

10. In a street sweeping machine,

` a body,

a first arm pivotally mounted on said body and movable up and down in an arc, a housing pivotally mounted on said iirst arm, a side 8 broom suspended from said housing and movable up and down with said iirst arm,

means for rotating said side broom, a second arm pivot-A ally mounted at one end on said body codirectionally disposed with respect to said first arm, spring means carried by said second arm,

a cable joined at one end with said spring means and i at an opposite end with said irst arm providing a oating suspension for said rst arm and said side broom enabling the side broom to be engaged against a surface to be swept and enabling the side broom to drop into road depressions to sweep level surfaces as Well as depressions, and

means operatively connected with said second arm forV pivoting said arms up an down in codirectional rela-U.

an arm pivotally connected to` said body and to said` housing in parallelogrammatic relation to said irst` mentioned arm and supporting self-operating yield-1 able means operatively engaged between side broom` and said body for maintaining said side broom;

in a given sweeping position and for permitting the side broom to swing longitudinally back and forth on said pivot means in line with the path of travelof the machine upon striking a fixed abutment and for returning the side broom to said given sweeping position upon passing over the abutment.

12. In a street sweeping machine, a body,

a hollow arm pivotally mounted at one end on said` body,

a side broom supporting housing pivotally mounted on` an opposite end of said arm,

a side broom suspended from said housing for back and forth movement longitudinally of said body, drive means extended through said arm, and said housing and operatively connected with said side broom for driving the same,

a universal joint connecting said drive means with said side broom permitting in and out movement of the side broom relative to said body,

an arm pivotally connected to said body and to said housing in parallelogrammatic relation to said first mentioned arm and supporting self-operating yieldable .means operatively engaged between said side broom and said bodytfor maintaining said side broom 1 in a given sweeping position and for permitting the side broom to swing longitudinally back and forth in line with the path of travel of the machine `upon striking aiixed abutment and for returning the side broom to said given sweeping position upon passing 1 over the abutment, and

spring means operatively connected between the side. broom and the body for permitting in and out move-` r ment of said side broom relative to said body; 13. In a street sweeping machine, a body, an arm pivotally mounted at one end on said body,

a side broom supporting housing pivotally mounted on an opposite end of said arm for rotary movement4 relative to said arm, a side broom suspended from said housing for back and forth movement longitudinally of said body, drive means operatively connected with said side broom;

for driving the same,

an arm pivotally connected to said body and to said t Y housing in parallelogrammatic relation to` said first mentioned arm and supporting self-operating yieldable means operatively engaged between said side broom and said body for maintaining said side broom in a given sweeping position and for permitting the said arms. 14. In a street sweeping machine including a body and means for motivating the body for sweeping,

a side broom assembly including a housing having driving means therein and pivotally mounted on said side broom to swing longitudinally back and forth 5 body, in line with the path of travel of the machine upon a shaft structure extending downwardly from said housstriking a fixed abutment and for .returning the side ing and having a side broom on its lower end, broom to said given sweeping position upon passing said shaft structure including a universal joint below over the abutment, the pivotal mounting of said housing, spring means operatively connected between the side lo resilient biasing means connected between the housing broom and the body for permitting in and out moveand the shaft structure below said universal joint ment of said side broom relative to said body, and enabling in and out movements of the side broom means operatively connected with said arm and said relative to said body and normally returning the side broom for moving said side broom up and down side broom to a predetermined sweeping position, vvertically through parallelogrammatically pivoting 15 and resilient means connected between said body and said housing enabling yielding of said side broom by pivoting of said housing in longitudinal direction in means for motivating said body for sweeping,

a side broom assembly,

means supporting said side broom assembly on said 20 body and including a pivotal connection whereby said assembly is adapted to swing longitudinally back and forth in line with the path of travel of the machine to clear a ixed abutment and then return to sweeping position, 25

line with the path of travel of the machine upon striking a fixed abutment and automatically returning the side broom to said predetermined sweeping position after passing over the abutment.

References Cited by the Examiner UNITED STATES PATENTS the assembly and automatically returning the assembly to said sweeping position and including means for adjusting the normal sweeping position longitudinally in line with the path of travel of the machine.

CHARLES A. WILLMUTH, Prmary'Examner.

S. E. BECK, Assistant Examiner.

Claims

3. IN A STREET SWEEPING MACHINE, A DRIVEN SHAFT, A SIDE BROOM, MEANS COUPLING SAID SIDE BROOM WITH SAID DRIVEN SHAFT, A FIRST PIVOT MEANS SUPPORTING SAID SIDE BROOM FOR BACK AND FORTH LONGITUDINAL SWINGING MOVEMENT AND A SECOND PIVOT MEANS SUPPORTING SAID SIDE BROOM FOR IN AND OUT TRANSVERSE SWINGING MOVEMENT, YIELDABLE MEANS FOR MAINTAINING SAID SIDE BROOM IN A GIVEN SWEEPING POSITION AND FOR PREMITTING THE SIDE BROOM TO SWING LONGITUDINALLY BACK AND FORTH ON SAID PIVOT MEANS IN LINE WITH THE PATH OF TRAVEL OF THE MACHINE TO CLEAR A FIXED ABUTMENT AND FOR RETURNING THE SIDE BROOM TO SAID GIVEN SWEEPING POSITION, YIELDABLE MEANS FOR MAINTAINING SAID SIDE BROOM IN SAID SWEEPING POSITION AND FOR PERMITTING THE SIDE BROOM TO SWING TRANSVERSELY IN AND OUT ON SAID PIVOT MEANS AND FOR RETURNING SAID SIDE BROOM TO SAID GIVEN POSITION WHEN THE SIDE BROOM IS MOVED AFTER STRIKING A CRUB AND THE LIKE, AND MEANS FOR MOVING THE SIDE BROOM VERTICALLY IN A SUBSTANTIALLY STRAIGHT LINE INTO AND OUT OF SAID SWEEPING POSITION.