US3774322A

US3774322A - Snow-handling implement with belt-driven impeller and coacting labyrinthian baffle

Info

Publication number: US3774322A
Application number: US00191736A
Authority: US
Inventors: E Enters; W Price; L Hochwitz
Original assignee: Gilson Brothers Co
Current assignee: Toro Co; GILSON BROS Co
Priority date: 1971-10-22
Filing date: 1971-10-22
Publication date: 1973-11-27
Anticipated expiration: 1990-11-27
Also published as: CA963027A

Abstract

To exemplify an implement to which the invention has particular application, we are showing herein a self-propelled snow thrower in which a propulsion shaft and thrower are driven by separate belts. The thrower impeller is encircled by an annular baffle structure with which it cooperates to exclude snow from the drive compartment without requiring a bearing or frictional contact seal for this purpose. Elimination of any solid wall between the impeller and drive compartments and elimination of any driving connection between the thrower impeller and the shaft which defines its axis of roation eliminates keys, set screws and the like and reduces fabrication costs.

Description

[ Nov. 27, 1973 United States Patent [1 1 Enters et al.

[ SNOW-HANDLING IMPLEMENT WITH Vanvick.........................,.... 37/43 E BELT-DRIVEN IMPELLER AND COACTING LABYRINTHIAN BAFFLE [751' Inventors:

Primary ExaminerRobert E. Pulfrey Edward W. Enters, Fredonia;

Assistant ExaminerEugene H. Eickholt Attorney-Wheeler, House & Wheeler Warren H. Price, Sheboygan; Lynn E [73] Assignee: Gilson Bros. Co.,

[22] Filed:

. Hochwitz, Plymouth, all of Wis.

] ABSTRACT To exemplify an implement to which the Plymouth, Wis.

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fines its axis of roation eliminates keys, set screws an the like and reduces fabrication costs.

13 Claims, 3 Drawing Figures XRBB 333 B444 777 /333 7 3 4 1954 Bamard...........................

ym 0" mt no KR 77 99 ll 51 0358 6604 5962 7 75 2323 v w 5 M Z? JW%% M w M m Patented Nov. 27, 1973 Patented Nov. 27, 1973 2 Sheets-Sheet 2 Q Q Vw it'rmra Q 170 274645 SNOW-HANDLING IMPLEMENT WITH BELT-DRIVEN IMPELLER AND COACTING LABYRINTHIAN BAFFLE BACKGROUND OF THE INVENTION SUMMARY OF THE INVENTION Although the traction wheel drive shaft and the rotary snow thrower impeller shaft are substantially coaxial and both driven directly from the same power shaft of the engine, the present invention contemplates that the driven pulley for the thrower impeller be a unitary part of the thrower impeller, thus eliminating from the thrower all mechanical connections with any shaft. Exclusion from the drive chamber of snow impelled by the throwing impeller is accomplished by an annular labyrinth baflle which comprises a ring carried by the snow thrower impeller and a stationary annular flange with which the ring coacts for centrifugal discharge of snow from the area about the impeller, thus eliminating mechanical driving connections and close tolerance clearances. The impeller rotor has blades mounted directly upon one of its faces, the other face including a pulley flange with which a disk with a complementary flange is unitarily connected to form a pulley. The drive through the pulley to theimpeller is independent of the drive to the traction wheels. The impeller is driven directly at its periphery, without requiring any drive connection to its shaft.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagrammatic perspective view of a snow thrower exemplifying the invention.

FIG. 2 is an enlarged detail view in cross section along the axis of the propulsion shaft.

FIG. 3 is an enlarged cut away fragmentary sectional view showing details of the labyrinthian baffle.

DESCRIPTION OF THE PREFERRED EMBODIMENT 1 Although the disclosure hereof is detailed and exact to enable those skilled in the art to practice the invention, the physical embodiments herein disclosed merely exemplify the invention which may be embodied in other specific structure. The scope of the invention is defined in the claims appended hereto.

The snow thrower and most of the details are principally used herein merely for purposes of exemplification. The invention is not regarded as being limited to the specific structure illustrated.

In the implement shown, the engine 4 and guide handle 6 are connected with supporting and traction wheels at 8 upon which the traction wheel drive compartment 10 is likewise mounted. Ahead of compartment 10 is a belt drive compartment 11 and ahead of compartment 11 is a generally cylindrical impeller compartment or chanber 12 with adjustable chute 14 and deflector l6. Attached to the front of chamber 12 is a shroud l8 partially enclosing the augers which are mounted on shaft 22 driven from gear housing 21 and which serve to feed snow through the rear opening 24 of the shroud into the path of blades 26 which are part of the impeller 28. These blades throw the snow up the chute 14 fordischarge in a direction determined by the deflector 16.

Power from the engine 4 is transmitted from the engine drive shaft 30 by means of pulley 32 and belt 34 to a driven pulley 36 in compartment 11 and splined at 38 to the shaft 40. Shaft 40 drives the traction wheel 8. The hub 42 of pulley 36 carries a bearing 44 wich is piloted on the shaft 46 to support a sleeve 48 which is fastened to shaft 46 by pin 45 and which provides a hub for the snow thrower impeller 28. Another bearing 50 mounted on the gear case 21 supports the forward end of the shaft 46.

In effect, the snow thrower impeller 28 comprises a hollow pulley or body 27 having a forward generally radially extending wall 52 and a rear wall 54, the latter having a frusto-conical peripheral portion 56 coacting with an oppositely formed frusto-conical flange 58 to receive V-belt 60 reeved around pulley 57 mounted on the engine drive shaft 30 in axially spaced parallel relation to the drive pulley 32. Projecting axially from the forward wall 52 of the hollow pulley 27 are several (two or three) snow-throwing arms 26 which have trajectories aligned with the chute 14 from which the snow is to be ejected.

Peripherally outside of the arms 26 the front wall 52 of pulley 27 is provided with an annular rearwardly turned flange 64 of substantially cylindrical outline. The margin 66 of flange 64 extends over shoulder 68 of a ring 70 which is a fixed part of the housing and encircles the periphery 72 of the hollow pulley 27. It will be noted that the inner periphery of ring 70 extends substantially radially from the cylindrical portion 72 of the pulley. At shoulder 66 the ring 70 turns rearwardly and thence outwardly again at 74 to its supporting sleeve portions 76 (FIG. 2).

As best shown in FIG. 3, the flange 64 of the impeller body 27 is provided with small wiper blades 59 spaced widely about the periphery of the flange 64. These blades keep the zone about the impeller free of ice. The blades 59 and friction of the rotating impeller on air and snow induce impact and centrifugal forces on the air and snow which prevent snow from moving from the impeller compartment 12 toward and into the belt drive compartment 11.

The aforedescribed structure also affords an air inlet opening 61 and air outlet opening 63 (FIG. 3) for flow of air in the direction of arrows centrifugally induced by rotation of the impeller. This air flow also serves to exclude movement of snow from the impeller compartment 12 into the belt drive compartment 11. Moreover, inasmuch as air and snow are being thrown out of the chute 14, the impeller compartment 12 tends to be at a somewhat reduced pressure. This also helps induce air flow in the direction of arrows 65.

The impeller body 27 has sufficient axial thickness (because it is hollow) to provide clearance around its periphery for the labyrinthian baffle path provided by the

flanges

64, 66, 68 and 70. This is so effective in excluding snow from the belt drive compartment 11 that the usual bearing partition is completely eliminated. The rotor 28, instead of being driven by a shaft, is directly belt-driven independently of any shaft, thus eliminating considerable expense in manufacture.

Snow entering the shroud 18 and being advanced by the screws 20 to the impeller 28 for discharge will almost entirely be ejected through the impeller housing l2 and chute 14 without penetrating the belt drive compartment 11. The labyrinthian baffle is very effective in excluding snow from the drive mechanism. A major factor in making this possible is the impellerpulley combination and its relation to the baffle ring.

We claim:

1. A snow-handling implement comprising a rotatable part, means for mounting said part for rotating on a predetermined axis, said part having snow-throwing blades projecting to rotate about the axis on which the part rotates, and means engaging the periphery of such part for efi'ecting rotation of said part and blades, a labyrinthian baffle comprising a first flange encircling said part, said part having a lapping flange coacting therewith.

2. An implement according to claim 1 in which said first flange is stationary and has an annular shoulder across which a marginal portion of said lapping flange projects.

3. An implement according to claim 2 in which said part has a broad face terminating in a groove and provided in offset relation to the groove with said lapping flange which extends from said face radially and then axially, said first flange having a fixed mounting and provided with an axial shoulder across which said lapping flange extends.

4. A snow-throwing implement comprising the combination with means providing a drive compartment and an impeller compartment having discharge means comprising a chute, a first shaft in the drive compartment, a second shaft extending into the impeller compartment, an impeller mounted on the second shaft and free to rotate with respect to the first shaft, said impeller being disposed partly in the impeller compartment and having a groove in the drive compartment, snowpropelling blade means on the impeller in the impeller compartment, and a labyrinthian baffle between said compartments and comprising a relatively stationary annular flange encircling the impeller between said compartments and provided with an axial offset shoulder, and a baffle ring mounted on the impeller and having a peripheral marginal portion extending axially in lapping relation to the shoulder, a belt wholly disposed in the drive compartment and engaged in said groove, and means for actuating the belt.

5. A snow-throwing implement comprising the combination with means providing in series a screw feed compartment, an impeller compartment, a belt drive compartment and a traction drive compartment, coaxial shafts leading from said belt drive compartment in opposite directions, one of said shafts having a bearing at one side of the belt drive compartment and the other spanning the impeller compartment and leading to the screw feed compartment, a pair of driven pulleys mounted upon proximate ends of the respective shafts,

driving pulleys haivng belts leading to the individual driven pulleys, the impeller compartment having a wall encircling the driven pulley which is on the shaft spanning the impeller compartment, said last mentioned pulley having a wall portion having a peripheral flange adjacent a flange with which the wall of the impeller compartment is provided and which encircles the last mentioned pulley.

6. An implement according to claim 5 in which the shaft spanning the impeller compartment is piloted on the said one shaft.

7. An implement according to claim 5 in which said pulley wall portion flange and impeller compartment wall flange comprise a rotary baffle, the said pulley on the shaft spanning the impeller compartment being primadly in the belt drive compartment and having vanes axially projecting from it in said impeller compartment and constituting said impeller.

8. In a snow thrower having a drive compartment, an impeller compartment, an impeller in said impeller compartment and drive means therefor in the drive compartment, the improvement for excluding transfer of snow from the impeller compartment to the drive compartment which comprises a baffle ring between said compartments, said impeller having a portion adjacent said ring, said ring and said impeller portion defining a labyrinth which centrifugally excludes snow from moving from the impeller compartment to the drive compartment when the impeller is rotated with respect to said ring.

9. An improvement according to claim 8 in which said baffle ring has an opening, said impeller having a body within said opening but spaced slightly from the baffle ring, said ring having a shoulder spaced outwardly from said opening, said impeller having a flange in outwardly spaced relation to said shoulder.

10. The improvement according to claim 9 in which the space between the impeller body and ring comprises an inlet and the space between the flange and shoulder comprises an outlet for air centrifugally tending by rotation of the impeller to flow from the drive compartment into the impeller compartment.

11. An improvement according to claim 9 in which said impeller body comprises a hollow drum with a substantially cylindrical wall within the ring opening, said drum having an end wall with peripheral margin turned to constitute said flange.

12. An improvement according to claim 11 in which said end wall has impeller blades extending therefrom into the impeller compartment.

13. An improvement according to claim 9 in which the impeller has a drive pulley in the drive companment.

Claims

1. A snow-handling implement comprising a rotatable part, means for mounting said part for rotating on a predetermined axis, said part having snow-throwing blades projecting to rotate about the axis on which the part rotates, and means engaging the periphery of such part for effecting rotation of said part and blades, a labyrinthian baffle comprising a first flange encircling said part, said part having a lapping flange coacting therewith.

4. A snow-throwing implement comprising the combination with means providing a drive compartment and an impeller compartment having discharge means comprising a chute, a first shaft in the drive compartment, a second shaft extending into the impeller compartment, an impeller mounted on the second shaft and free to rotate with respect to the first shaft, said impeller being disposed partly in the impeller compartment and having a groove in the drive compartment, snow-propelling blade means on the impeller in the impeller compartment, and a labyrinthian baffle between said compartments and comprising a relatively stationary annular flange encircling the impeller between said compartments and provided with an axial offset shoulder, and a baffle ring mounted on the impeller and having a peripheral marginal portion extending axially in lapping relation to the shoulder, a belt wholly disposed in the drive compartment and engaged in said groove, and means for actuating the belt.

5. A snow-throwing implement comprising the combination with means providing in series a screw feed compartment, an impeller compartment, a belt drive compartment and a traction drive compartment, coaxial shafts leading from said belt drive compartment in opposite directions, one of said shafts having a bearing at one side of the belt drive compartment and the other spanning the impeller compartment and leading to the screw feed compartment, a pair of driven pulleys mounted upon proximate ends of the respective shafts, driving pulleys haivng belts leading to the individual driven pulleys, the impeller compartment having a wall encircling the driven pulley which is on the shaft spanning the impeller compartment, said last mentioned pulley having a wall portion having a peripheral flange adjacent a flange with which the wall of the impeller compartment is provided and which encircles the last mentioned pulley.

7. An implement according to claim 5 in which said pulley wall portion flange and impeller compartment wall flange comprise a rotary baffle, the said pulley on the shaft spanning the impeller compartment being primarily in the belt drive compartment and having vanes axially projecting from it in said impeller compartment and constituting said impeller.

13. An improvement according to claim 9 in which the impeller has a drive pulley in the drive compartment.