US1550575A - Snowplow - Google Patents

Description

3 Sheets-Sheet 1 SNOWPLOW MATTORNEYS' Fifi? D. A. SARGENT Filed April 28, 1925 Aug. 18, 1925.

Aug. 18, 1925.

D. A. SARG ENT S NOWPLOW Filed April 28, 1925 3 Sheets-Sheet 2 INVE TOR 41% A; ATTORNEYS I Aug. 18, 1925.

- D. A. SARGENT SNOWPLOW' 5 Sheets-Sheet 5 Filed April 28 lll l .rllllll .IIIII M ATTORNEYS Y Mwil,

Patented Aug. 18, v1925.

UNITED STATES A 1,550,575 PATENT OFFICE- DON SARGENT, F BANGOR, MAINE, ASSIGNOR T0 NORTHERN TRAILER COMPANY, OF BANGOR, MAINE, A CORPORATION OF MAINE.

SNOWPLOW.

, Application filed April 28, 1925. Serial No. 26,330.

To all whom it may concern:

Be it known that I, DON A. SARGENT, a citizen of the United States, residing at Banor, in the county of Penobscot, State of ila1ne,'have invented certain new and useful Improvements in Snowplows; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. f

This inventionrelates to snow plows of the tractor-driven type and more particularly to means for raising and lowering the nose and wings.-

In my copending application, Serial No. 658,485 filed August 21, 1923, I have illustrated and described a snow plow comprising a plow-carrying frame designed to sur round a tractor and pivotally mounted on supporting sled runners. The nose, or plow proper, israised or lowered by swinging the frame up or down on the sled runners by means of a pair of levers fulcrumed on the sled, one on each runner, pivotally connected to the frame at their forward ends, and extending rearwardly. These levers are designed for manual operation and therefore requiretwo men for best results. The plow of this earlier application is also provided with a.pair of wings or auxiliary plow members, one on each side of the plow, mounted upon the frame just behind the nose for universal swinging movement. These wings are swung upwardly by means of a pair of separate manually operated chain falls, one for each wing, and held in lateral adjustment by means of adjusting bars or struts.

It is the object of the present invention to improve upon these prior means for raising and lowering both the nose and the win of a snow plow. In attaining this object I ave provided four fluid-actuated lifting means, one for each side of the nose and. one for each wing, operable from a centrally located point, as for instance, the cab of the tractor. The two wing lifting means can be separately operated so that each wing can be raised or lowered independently, but the two lifting means for the nose are designed to be operated simultaneously by the same control so that both sides of the nose shall always be raised or lowered together and without likelihood of twisting, tilting or binding.

the plow shown in Figure 1, F i ure 4 is a rear elevation of the same plow, igure 5 is a diagrammatic layout of the fluid pressure system and its controls, Figure 6 isan enlarged detail of one of the win raising and lowering mechanisms, F i 'ure is a section taken along line 7-7 of Figure 6, and Figure 8 is a detail showing the relation between the two upper sheaves shown in F igures 6 and 7.

The plow illustrated in these drawings is fundamentally the same as the one described in my copending application Serial No. 658,485. It comprises a V-shaped'nose or plow proper 1, fixed to and carried by a rearwardly extending frame comprising side members 2 and a removable draft bar 3 designed to enclose a tractor 4, preferably of the traction-belt type. Within this frame is situated a sled having side runners 5 connected at their forward ends by means of a cross-bar 6. The side members of the frame arepivoted to the sled at the points 7 so that the frame and nose can be pivoted relative to the sled and the nose raised and lowered in consequence. Just behind the nose, on

.each side of the frame, a wing or auxiliary plow member 8 is niou-nted-for lateral vertical adjustment, in a manner which will be described later.

I shall now describe, with particular reference to Figures 1 and 2, the mechanism for pivoting the frame upon the sled and thereby raising and lowering the nose of the plow. Near the forward endof each sledrunner 5, lever 10 is fulcrumed upon a link 11. The forward end of this lever is secured to the side member 2 by means of a bracket 12. The rear end is pivotally connected to a lpiston rod 13, of a piston 14,, mounted wit in a cylinder 15, which cylinder is provided with a trunnion 16, journalled within a frame 17 secured to the side of the member 2. By admitting fluid under pressure to the cylinder 15, the piston 14 and piston rod 13 are moved downward, and the frame and nose of the plow are moved upward relative to the forward end of the sled.

I shall now describe, with partic'ular reference to Figures 4, 6, 7 and 8, the mechanism employed for raising and lowering the Wings 8. Mounted upon the rear end of each side member 2 of the frame is a doiible upright 18, these uprights being connected by means of a horizontal cross-bar 19. On each of these uprights 18 is mounted a cylinder 21 having a piston 22 and a piston rod 23 terminating in a cross-head 24 slidable in ide-ways 25. Mounted near the top of upright 18 is a sheave 26 lying in a plane transverse to the direction of movement of the plow, and just below this sheave, at right-angles thereto, is a second sheave 27. Two additional sheaves 28 and 29 are carried by the cross-head 24 and move with it. A chain 31 is secured to each wing 8 near the outer end thereof and extends upward over sheave 26, then downward around sheave 28, up again around sheave 27, down again around sheave 29 and up to anchor bolt 32 on cross-bar 19. The admission of fluid under pressure to the cylinder 21 causes a downward movement of the. piston 22, piston rod 23, cross-head 24 and the two sheaves 28 and 29, which in turn results in an inward pull on the chain 31 and a movement of the wing inwardly and upwardly. The position of each wing is also determined by means of a telescoping supporting bar or strut 33 pivotally mounted at one end to the outer end of the wing and at the other end to an upright 18.

I shall now describe, with particular ref- .erence to Figures 4 and 5, the mechanism for applying and controlling the fluid pressure which actuates the levers 10 and the chains 32. The fluid which I prefer to use is oil. The oil supply is maintained within a tank 35, whence it passes through a suction pipe 36 to a pump 37 thence through a discharge pipe 38 to a header 39, and

thence through a pipe 41 to the cylinders 15 which control the movement of the nose and through pipes 42 and 43 to the two cylinders 21 which control the raising and lowering ofv the wings. The pipes 42 and 43 pass directly to their respective cylinders, whereas the pipe 41 connects with a common crossipe 44 which leads directly to both cyliners 15, thus maintaining an equal pressure in each. The pump 37 is equipped with a by-pass containing a pressure regulating valve 45, the operation of which is well understood. The pipes 36 and 38 are connected by means of a shunt pipe 46 controlled b means of a three-wa valve 47 situated in the pipe 38. The pipes 41, 42 and 43 are also connected to the suction pipe 36 by means of return ipes 48, 49 and 50 respectively, controlled y three- way valves 51, 53 and 52 respectively. The oil tank and pump are preferably situated at the rear of the tractor and the control valves 47, 51, 52 and 53, within the cab, as illustrated in Figure 4. r

I shall now describe the operation of my improved mechanism for raising and lowering the nose and the wings, explaining how the illustrated pressure control s stem functions to. this end. The pump, riven pref; erably from the engine of the tractor, oper ates continuously. When the lifts are not in use the valve 47 is turned so that oil circulates freely from the pump through pipe header 39, thus relieving the pump of back pressure. When the lifts are to be operated, the valve 47 is turned to close pipe 46 and permit oil to flow to theheader 39 and thence to the pipes 41, 42 and 43. When the nose is to be elevated, the three-way valve 51 is turned to permit oil to flow directly through the pipe 41 to the cross,- pipe 44, and to close pipe 48; When the desired elevation has been reached, the valve is turned to shut off pipe 41 from the rest of the system and thus maintain the established pressure within the cylinders 15., When the nose is to be lowered, the valve 51 is again moved to connect the pipe 41 with the exhaust pipe 48, whereupon the downward pressure of the nose itself will force the oil out of cylinders 15 and back into tank 35. The operation of cylinders 21 is identical with this. It is to be observed, however, that cylinders 21 can be independently operated, whereas the two cylinders 15 are operated together.

By means of the mechanism illustrated and described above, I am enabled effectively and quickly to control the positions of the nose and the wings by manipulation of the valves 51, 52 and 53 all centrally located within the cab of the tractor and easily reached. Each wing may be independently controlled, whereas the two cylinders which control the nose are operated in unison, and being situated one on either side of the frame insure an even and steady swinging movement of the nose.

I claim:

1. A snow plow comprising the cornbination of a sled, a frame pivotally mounted on the said sled for movement in a vertical plane, a nose secured to the frame, and means mounted on each side of the frame for pivoting the frame upon the sled'to raise and lower the nose, and means for simultaneously operating each-pivoting means.

2. A. snow plow comprising the combination of a sled, a frame pivotallyvmounted on the said sled for movement in a vertical plane,

a nose secured to the frame, fluidoperated means mounted on each side of the frame for pivoting the frame upon the sled to raise and lower the nose, a common source of fluid pressure, and a common control means for both pivoting means.

3. A snow plow comprising the combination of a sled, a frame pivotally mounted near the rear end .of the sled for movement in a vertical plane, a nose secured to the frame, two levers, one fulcrumed near the forward end of each sled runner and con- .nected to the frame, and fluid-operated means connected to each lever for swinging the levers and pivoting the frame upon the sled to raise and lower the nose.

f. A snow plow comprising the combination of a sled, a frame pivotally mounted near the rear end of the sled for movement in a vertical plane, a nose secured to the frame, two levers, one fulcrumed near the forward end of each sled runner and connected to the frame, fluid-operated means connected to each lever for swinging the levers and pivoting the frame upon the sled to raise and lower the nose, a common source of fluid pressure and a common control means for both fluid operated means.

5. A snow plow comprising the combination of a sled, a frame pivotally mounted near the rear end of the sled for movement "in a vertical plane, a nose secured to the frame, two levers, one fulcrumed near the forward end ofeach sled runner and connected to the frame, and a fluid-operated piston connected to each lever for swinging the levers and pivoting the frame upon the sled to raise and lower the nose.

6. A snow plow comprising the combination of a sled, a frame pivotally mounted near the rear end of the sled for movement in a vertical plane, a nose secured to the frame, two levers, one fulcrumed near the forward end of each sled runner and connected to the frame, a, fluid-operated piston connected to each lever for swinging the levers and pivoting the frame upon the sled to raise and lower the nose, a common source of fluid pressure for each piston and a common control means.

7 In a snow plow, the combination of a sled, a plow nose, a lever fulcrumed' on the sled and connected at one end to the nose to raise and lower the nose relative to the sled,

a cylinder, a piston in the cylinder connected to the other end of the lever, and a source of fluid pressure for the cylinder.

8. In a snow .plow the combination of a sled, a frame, a plow nose secured to the frame, a lever fulcrumed on the sled and connected at one end to the frame to raise and lower the nose relative to the sled, a cylinder pivotally mounted on the frame, a piston in the cylinder connected to the other end of the lever, and a source of fluid pressure for the cylinder.

9. A snow plow comprising the combination of a nose, a rearwardly extending frame, a wing pivotally mounted upon the frame behind the nose, an upright on the rear of the frame, a cylinder mounted on the upright, a piston in the cylinder, a pulley on the piston, a chain extending from the wing to the upright and passing around the pulley on the piston, and a source of fluid pressure for the cylinder.

' 10. A snow plow comprising the combination of a nose, a rearwardly extending frame secured thereto and designed to receive a tractor, a supporting sled to which the frame is pivotally connected, fluid-operated means mounted on each side of the frame for pivoting the frame upon the sled to raise and lower the nose, Wings pivotally mounted, one upon each side of the frame behind the nose, fluid-operated means for pivoting each wing, a common source of fluid pressure, and centrally located control means.

11. In a snow plow having plow members adapted to be raised and lowered, the combination of an oil-operated system for effecting this raising and lowering comprising the combination of a cylinder controlling a plow member an oil supply tank, a pump, a suction pipe leading from the tank to the pump, a discharge pipe leading from the pump from the discharge pipe to the suction pipe, and a three-way valve situated at the junction of the discharge pipe and the return In testimony whereof I aflix my signature.

DON A. SARGENT.

to the cylinder, a return pipe. leading

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