USRE20453E - Sweeper - Google Patents

Description

July 20, 1937. E. K. FuRsTNow SWEE PER Original Filed. Deo. 2, 1935 3 Sheets-Sheet lw, M 1 SA n .a l E M ,K

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July 20, 1937. E. K. FuRs'rNow SWEE PER Original Filed Des. 2, 1935 3 Sheets-Sheet 2 nvenlor am A Homeys July 20, 1937. E. K. FuRsTNow SWEEPER Original Filed Deo. 2, 1935 5 Sheets-Sheet 3 Invcn lor Ressued July 20, 1937 UNITED STATES PATENT OFFICE Original No. 2,046,679, dated July 7, 1936, Serial No., 52,567, December 2, 1935. Application for reissue May 22, 1937, Serial No. 144,265

7 Claims.

The present invention relates to new and useful improvements in sweepers of the power type and has for one of its important objects to provide a comparatively small machine of this character for use particularly in sweeping streets; sidewalks, warehouses, etc. Y

A further object of the invention is to provide a sweeper of the character referred to in which the weight of the rear end of the main frame of the machine in which the rotary sweeper broom is mounted may be supported in part by the broom and in part by a wheeled support upon which the weight is imposed through a suitable spring cushion and in which means is provided for transferring varying portions of the load from the cushion to the broom or from the broom to the cushion to vary the pressure imposed upon the broom, so that the broom is maintained in effective sweeping engagement with the surface being swept under a substantially constant pressure and is at all times yieldably supported so that it may follow the contour of surface being swept.

A further object is to connect the wheeled support upon which the rear end of the frame is yieldably and adjustably mounted to the frame by a vertical pivot and to provide means for swinging said wheeled support about the vertica pivot to steer the sweeper.

Other objects of the invention are to provide a sweeper of the character described which will be simple in construction, strong, durable, highly efficient and reliable in use, compact, light in weight, attractive in appearance, and which may J be manufactured and operated at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a View in side elevation of a sweeper constructed in accordance with the present invention;

Fig. 2 is a top plan view thereof; and

Fig. 3 is a view in vertical longitudinal section through the invention, taken substantially on the line 3 3 of Fig. 2.

Referring now to the drawings in detail, it will be seen that the embodiment of the invention which has been illustrated comprises a frame I, the forward end portion of which is supported on a pair of rubb'er tired front wheels 2. The front wheels 2 are mounted on an axle 3 Which is journaled in bearings 4 beneath the frame I. As illustrated to advantage in Figure 2 of the drawings, the right hand wheel 2 is located within the frame I for permitting sweeping close to a curb, wall or the like.

Rising from the rear end oi.' the frame I is a rearwardly curved arm 5 having a vertical bearing 6 on its free end. Rotatably and slidably mounted in the bearing 6 is a vertical shaft 1 having a fork 8 on its lower end in which a rubber tired wheel 9 is journaled for supporting the rear end of the frame I. A steering wheel I0 is fixed on the upper end of the shaft 1. Pivotally mounted, at an intermediate point, on the arm 5 is a hand lever II having a yoke I2 on one end which straddles the shaft 1 below the bearing 6. Encircling the shaft 1 is a coil spring I3 upon which the yoke I2 rests and which, in turn, rests on the fork 8. Suitable latching means I4 is provided for releasably locking the lever II in adjusted position. As is thought to be apparent, by adjusting the lever II the rear end of the frame I may be raised or lowered. Further, the spring I3 yieldingly supports the rear end of the frame I. Mounted on the vertical bearing 6 is an operators seat I5.

Journaled in bearings I6 beneath the rear portion of the frame I is the shaft I1 of a rotary broom I8. Extending forwardly from the broom I8 on the frame I is a hopper I9 having one side portion recessed, as at 20, to accommodate the right hand wheel 2. Projecting rearwardly from the hopper I9 is an arcuate shield or housing 2I which extends over the broom I8. The hopper I9 includes a forwardly inclined bottom 22 to the rear end of which a plate 23 is hingedly oon- Anected. Mounted on the free rear end portion of the hinged plate 23 is a rubber ground engaging lip or blade 24. The lower portion of the forward end of the hopper I 9 is formed to provide a discharge opening 25 which is closed by a door 26 of substantially segmental cross section, said door including side walls 21. The side walls 21 of the door 26 are pivotally mounted on hangers, brackets or the like. 28 on the side walls of the hopper I9. The door or closure 26 is adapted to swing upwardly into the forward portion of the hopper I9. An operating cable 29 is connected, at one end, to the door 26, said cable being trained over a pulley 30 on the forward end portion of I the frame I and having its other end connected to a'hand lever 3I on the rear end portion of said frame I. When in closed position, the door 26 abuts the forward end of the inclined bottom 22 and constitutes a continuation thereof.

driving said shaft 33. A suitable clutch 39 is provided for connecting and disconnecting the sprocket gear 38 and the shaft 33. The clutch 39 is operatively connected toa foot pedal 40 adjacent the operators seat I5 by means including a rod 4I, a bell crank lever 42, another rod 43, and a forked lever 44. A bearing 45 is provided for the shaft 33 at an intermediate point. The reference numeral 46 designates a suitable brake for the shaft 33, said brake being connected by a rod 41 to a foot pedal 48 adjacent the operators seat I5.

Journaled in bearings 49 rearwardly of the shaft 33 is a comparatively short shaft 59 which paranels said shaft 33. Fixed on one end por-i tion of the shaft 58 is a sprocket gear 5I over which the lower flight of the chain 31 travels. The shaft 58 drives the broom I8 in a counterclockwise direction through a chain and sprocket connection 52. A suitable clutch 53 is provided for connecting the broom I8 to the shaft 5D or for disconnecting said broom therefrom, said clutch 53 being operated by a hand lever 54. It will be seen that the driving mechanism which has been described is such that the wheels 2 are driven in a. clockwise direction for propelling the machine forwardly, while the rotary broom I8 is driven in the opposite direction.

Mounted on the lower portions of the side walls 55 of the hopper i9 are shields 56 which extend rearwardly adjacent the ends of the broom I 8. Bolts 51 are provided for adjustably securing the shields 56 to the hopper side walls 55, said shields having vertical slots 58 therein which accommodate said bolts. Safety chains 59 (see Figure l) connect the shields 55 to the frame I.

It is thought that the operation of the machine will be readily apparent from a consideration of the foregoing. With the clutch 39 in engaged position, the engine 35 drives the wheels 2 in a clockwise direction for pulling the machine forwardly. If desired, the clutch 39 may be of the reversing type to permit the machine to be backed. With the clutch 53 in engaged position the broom I8 is rotated in a counterclockwise direction for throwing dirt, trash, leaves, etc. up

the chute provided by the hinged plate 23 into the hopper I9 where it rests on the inclined bottom 22 and the closure or door 26. The hinged plate 23, together with the rubber lip or blade 24, prevents the rapidly rotating broom I8 from throwing the dirt, etc. forwardly beneath the hopper/I9 and, of course, the shields 56 prevent the dirt, etc. from being thrown laterally by the broom. The rubber lip or blade 24 rides easily over obstructions and irregularities that may be encountered in the ground, pavement or the like. To empty the hopper I9, the lever 3l is actuated to swing the door or closure 2E forwardly and upwardly into the forward portion of said hopper I9 for dropping the dirt, etc., in a. substantially vertical plane onto the ground. The door or closure 28 may return by gravity to closed position. Of course, springs may also be provided, if desirable or necessary, for yieldingly retaining the :dus

` the yoke I2 downwardly toward the fork 8 causes the weight to be progressively transferred from brush, the brush is maintained in effective sweep- `V-shaped arm, a shaft rotatably and slidably door or closure 28 in closed position. When it is desired to disconnect the broom I8 from the engine 35 it is only necessary, of course, to throw the clutch 53 to disengaged position. As hereinbefore stated. the wheels 2 may be readily disconnected from the engine 35 through the medium of the clutch 39. The machine is brakedby simply actuatingl the foot pedal 48.

It will be apparent that during operation of the sweeper the weight of the rear end of the sweeper frame is imposed in part upon the rotary brush I8 and in part upon the supporting and steering wheel 9 and that the spring I3 interposed between the adjustable yoke I2 and the fork 8 provides a yielding support for the frame at all times. The yoke I2 and fork 8 being the members which receive the thrust of the springs I3, mo-vement of the yoke I2 upwardly away from the fork 8 causes the weight of the rear end of the frame to be progressively transferred from the wheel 9 to the broom I8 and movement of the broom I8 to the wheel- 9. By adjusting the yoke I2 the desired weight may be imposed upon the broom I8. When a substantial proportion of the weight of the frame is imposed upon the ing engagement with the surface being swept, the brush providing one yielding sup-port for the rear end of the frame and the spring I3 another so that the brush I8 is maintained in effective sweep-ing engagement with the surface being swept and the wheel 9 is also maintained in engagement with the surface for effective steering I' even though the surface be quite irregular. By raising or lowering the rear end of the frame I through the medium of the lever I I the broom I8 may be adjusted vertically as desired. In this manner the pressure of the bro-om may be controlled as desired, also, wear on said broom may be compensated for.

As best seen in Figure 2 of the drawings, the arcuate arm 5 which carries the bearing 6, the seat I5, etc., is substantially V-shaped in plan. The support on which the operators seat I5 is mounted is designated by the reference numeral 60. In Figure 2 of the drawings, a curbing is designated by the reference numeral 8|.

It is believed that the many advantages of a sweeper constructed in accordance with the present invention will be readily understood, and although a preferred embodiment of the machine is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope of the invention as claimed.

What I claim is: 1. A sweeper comprising a frame for supporting a rotatable broom and hopper, a pair of supporting wheels mounted on the forward portion of said frame, a substantially V-shaped arcuate arm having its extremities attached to the rear portion of said frame and its apex located at a point rearward of and above the rear end of the frame, a vertical bearing located at the apex of the mounted in the bearing, a fork on the lower end of said shaft, a supporting and steering wheel journaled in the fork, a hand wheel fixed on the upper end of the shaft for turning the steering Wheel, -a hand lever pivotally mounted, at an intermediate point, on the arm, a yoke on one end of the hand lever straddling the shaft below the bearing, and a coil spring encircling the shaft and having one end engaged with the fork and its other end engaged with the yoke, said lever and coil spring constituting means for raising and lowering the rear end of the frame and for yieldingly supporting said rear end of said frame.

2. A sweeper of the character described comprising a supporting frame, wheels supporting the forward end of said frame, 'a rotary broom mounted in the rear end portion of the frame in a position to engage the surface over which the sweeper travels and to provide a support for the rear end of the frame, means for driving said broom, a wheeled support for the rear end of said frame, means connecting said support and frame for relative vertical movement including spring cushioning means interposed between said frame and said wheeled support through which weight not carried by the broom is imposed upon said support, and adjusting means for transferring varying portions of the imposed load from the cushioning means to the broom or from the broom to the cushioning means.

3. A sweeper of the character described comprising a, supporting frame, wheels supporting the forward end of said frame, a rotary broom mounted in the rear end portion of the frame in a position to engage the surface over which the sweeper travels and to provide a support for the rear end of the frame, means for driving said broom, a wheeled support for the rear end of said frame, means connecting said support and frame for relative vertical movement including opposed thrust members carried by said frame and wheeled support and spring cushioning means interposed between said thrust members through which weight not carried by the broom is imposed upon said wheeled support, and means for adjusting one of said thrust members to increase or decrease the load imposed upon the wheeled support and to thereby decrease or increase the load imposed upon said broom.

4. A sweeper of the character described comprising a supporting frame, wheels supporting the forward end of said frame, a rotary broom mounted in the rear end portion of the frame in a position to engage the surface over which the sweeper travels and to provide a support for the rear end of the frame, means for driving said broom, a wheeled support for the rear end of said frame, an upright shaft carried by said support, a bearing member carried by the frame in which said shaft is free to slide or turn, spring cushioning means interposed between said wheeled support and frame, means for varying the load imposed by the frame upon said cushioning means to vary the downward pressure exerted upon the broom, and means for turning said wheeled support about the axis of .said shaft to steer the sweeper.

5. A sweeper of the character described comprising a supporting frame, wheels supporting the forward end of said frame, a rotary broom mounted in the rear end portion of the frame in a position to engage the surface over which the sweeper travels and to provide a support for the rear endof the frame, means for driving said broom, a wheeled support rearwardly of said broom, an upright shaft carried by said support, a member fixed to the rear end of said frame which receives said shaft and provides a bearing within which the shaft may slide and turn, opposed thrust members carried by the frame and the wheeled support, cushioning means interposed between said thrust members through which weight not carried by the broom is imposed upon said support. means for adjusting one of said thrust members to increase or decrease the load imposed upon said cushioning means and to correspondingly decrease or increase the load imposed upon said broom, and means for turning said wheeled support about the axis of said upright shaft to steer the sweeper.

6. A sweeper of the character described comprising a supporting frame, wheels supporting the forward end of said frame, a rotary broom mounted in the rear end portion of the frame in a position to engage the surface over which the sweeper travels and to provide a support for the rear end of the frame, means for driving said broom, a wheeled support disposed centrally of said frame rearwardly of said broom, said support comprising a wheel, a fork straddling the wheel in which the wheel is journaled and an upright shaft fixed to said fork, a bearing member carried by said fr-ame in which said shaft may slide or turn, a vertically adjustable thrust member carried by said frame, a spring interposed between said thrust member and said fork, and means for turning said wheeled support about the axis of said shaft to steer the sweeper.

7. In a sweeper of the character described, a frame having rigidly connected side bars, coaxial supporting wheels at opposite sides of the frame adjacent its front end, a horizontal rotatable broom adjacent the rear end of the frame journaled at its ends in bearings fixed to said side vbars and disposed with its axis parallel to the axis of the front wheels, means for driving said broom, a wheeled support rearwardly of said broom, an upright shaft carried by said support, a bearing member in which said shaft may slide or turn, carried by the rear end of the frame centrally thereof spring cushioning means interposed between the frame and said wheeled support through which weight not supported on said broom is imposed upon said wheeled support, adjusting means for transferring varying portions of the imposed load from the cushioning means to the broom or from the broom to the cushioning means, and means for turning said wheeled support about the axis of said shaft to steer the sweeper.

EARL K. FURSTNOW.

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