US1786974A - Snowplow - Google Patents

Description

` /f' l @We UAM@ Dec, so, 1930. G. c. ABBE 1,786,974

sNowPLow I f FiledJuly 1e, 19g@ z'sheets-s'heet 1 j f Ou 3 o .2,

Dec. 30, E936.- G. c. ABBE 1,786,974.

SNOWPLOW .filed July 16,1926 2 Sheets-Sheet 2 7n 5 8 0 )o v A In" f v ,W70/Mfrs.

Patented nee. eo, 193e suenen lc. neen, 4or',naivivn'ra" sen E, EENNSYLVANIA, ASSIGNGR TO AMERICAN ROAD MAIERY COMPANY, ZINC., F KENNETT SQUARE, PENNSYLVANIA, A. COR- p Yronaaroiv on nnnawalnn Application led July 16,'

My` invention relates to improvement in snow plows and is more particularly lapplicable to plows of the blade type adapted to be secured to and propelled by a motor truck.

' d. Plows of .the type to which my invention pertains are usually secured to a truck through the medium of a frame pivoted on a transverse axis to a bracket secured to the axle of the truck. The blade or plow proper l@ is pivotally secured on a transverse axis to a semiring, which is in turn carried by the frame. rlhe blade is held in working position on its transverse axis by means of a p heavy spring, which permits it to tilt and pass over obstructions, which may be encount-v ered, and also acts to return it to working position against a lined stop, the position of which may be adjusted. ln such plows the iframe which supports the semiring is adapted 2@ to be raised, about its pivoted connection with" at relatively high speed thus enabling a relatively great distance to'be plowed in a minimum of time. However, such plows have been found to be .open to a number of objections which result chiefly from the erigencies of the service to which the plows are subjected. y l y For example, when'the blade strikes an obstruction, itis permitted to tilt against the action of Aa'heavy spring, which when the obstruction is cleared forces the blade back into working position against a xed stop. lin order that the` blade may be eiicient, the spring used is very heavy and substantial damage to the plow frequently occurs from the springs sharp action in returning the blade to working position.

Further, the lifting device and connections' 53 areso arranged that the connections are nec- 1926. Serial. No.; 122,753.

essarily slack when the plow is in operation, ,j

and the connections afford no support to the plow, in operation. lf the road'surface be uneven the plow will be heavily jarred, since the rollers will tend to bump over the sur- .face rather than follow it, and when it is sought to raise the plgw-,substantial time is consumed in taking out the slack in the connections. t

y Further, while in the present plows means are dprovided for spacing the lower .edge of the lade 'from the road surface, such means lare ineicient since they have no capacity for adjustment enabling adjustment of the plow, or for compensating forwear.

New it is an object of my invention to provide a plow which will have the requisite capacity t0 tiltand at the same time will be provided with a stop which will avoid damage to the plow on the returnto working position of the blade.

A further object of my invention is to provide connections between a hoisting device and the plow which will not only permit of the plow lbeing raised more rapidly, but

which will prevent to a substantial extent,

jarring -offthe plow on uneven road. surfaces.

A still further object of my invention is to provide improved means for spacing the lower edge of the blade from the road surface., which may be readily adjusted'to efect a desired spacing of the blade or to compensate or wear.

Having now indicated, in a. general way, the 'nature and purpose of my invention, l willproceed to a detailed description thereof with reference to the accompanying draw-v ings 'in which there has been illustrated aV preferred embodiment and in which Fig. l, isa snow plow embodying my in vention.

Fig. 2, isa'side view of the major portion Aci the plow shown in Fig. Il.

Fig. 3.

ig. 5, is a plan view of ap portion of the subject ot-Fig. d.

Fig. 6, is a view partly in section, a modification of the subject of Fig. 3. v

Referring more particularly to Figures 1-3, a, a indicate brackets adapted to be clamped to the front axle 1.00 of a Vmotor truck, the brackets are connnected by a bar b and carry clevises c. The ends of anA framed are pivotally secured to the clevises c by means of transversely extending pins e.

The blade f is attached to the forward end of the A frame in the usual manner, by means of a block and vertical and horizontal pivot pins, not shown, so as to be swingable on both a vertical and a horizontal axis.

A semiring g is secured at its ends to blade f by means of horizontally extending pins h, in alignment with the horizontal pin affording connection between the A frame and,

blade. The semiring is provided with holes z' adapted for the passage of a pin j extending through a bracket 71 mounted in the A frame, which overlies the rin As is apparent, the blade may be adjusted at an angle and the pins j passing through the bracket k and through one of the holes z', in the semiring,

serves to hold the blade in adjusted position.`

Extending across the semiring between its ends is a bar Z which serves to brace the semiring and also to supporta bracket m through which extends a rod 1t, the forward end of which is secured to a block 0in turn secured to a bracket p pivotally secured to the blade midway itsends and near its up er edge, by means of a horizontally exten ing pm.

Therear end of rod 11 is threaded for the reception of a nut, which with a washer g serves to confine a heavy coil spring 1' on the rod behind the bracket m. A lighter coil spring s positioned on the shaft infront of bracket m is confined between the bracket and the block o to which the forward. end of the -rod 11J is secured.

From theabove description, it will be observed that the blade isretained in a working compresses the spring 1", which when the obstruction is, passed, forces the blade back to working position, which as will Abe observed in accordance with my invention, is governed v by the spring-s which acts as a bufer to stop the blade yieldingly. The spring s also may permit the blade in returning to working position to tilt forward slightly and then act to return it, so that all jarand shock .is

of the bla e from the road surface.

removed from the blade and its supporting structure.

` Beneath the ends of the semiring and acting to support the forward end of the A frame are castors or rollers t each mounted in the lower end of a stem u which extends into the lower endof a casing o, secured to the semiring. The upper portion u of the stem u is reduced in size, forming a shoulder 'w' and extends through the casing. Within the casing and encircling the portion u of the stem u 'is a coil spring which is confined between shoulder lw and abutment y extending into the upper end of the casing and secured thereto by bolts .e and nuts 2. The portion u of the stem passes through the abutment and is provided at its upper end with a stop ,3, all as shown in detail in Figure 3.

As will now be observed, Lthe'rollers ,t act to support the forward end of the frame and the semirin and also .to space the lower ergge e rollers t may be adjusted to effect a desired spacing of `the blade from the road surface by varying the degree of penetration of the abutment g/ into the casing fv which'may be readily accomplished by an adjustment of the nuts on the bolts z. j

In Figures 4 6 I have illustrated a modification of means for supporting the A frame and spacing the plow from the road surface. The castors' or rollers t" are each mounted in the lower end of a stem 4 which projects into a casing 5 and the upper end of which is made hollow for the reception of a coilv spring 9 vwhich 'is confined between the stem and the upper end of the casing, as shown in Figure 6. A spring guide 6 is secured to the stem by a pin 7 and extends through the top of the casing. j A nut 8 threaded on the upper end of the guide 6 outside of the casing and engaging the top thereof, acts as a stop and enables adjustment of the stress of spring 5. The casing 5 is secured to the semiring g through a fitting 9. Brackets 10 are secured to the ends of the semiring and are provided at vthe forward ends with holes for the passage' of vpins/11 which are adapted also to pass through any one of a series of holes 12, ar.-

ranged o'ne above fthe other, in brackets 13 secured to the blade f, thus afordinga connection between the semiring and the blade.

As will now be obvious, the desired spacingv of the blade from the ground may be obtained by passing the pins 11 through oneor Yanother of the holes 12 in brackets 13.

Referringnow to Figure 2, the plow in accordance with my invention, is provided with a conventional hoisting device 1.02 to enable the forward end of the A frame to .be lifted about its pivotal connection with the truck in order to raise the blade. The hoisting device j lll) I and forming a stop for the lower end of the spring. The clamp confines the spring between itself and the hook 15.

As will now be obvious, the hoisting device is connected to the semiring through a spring under initial stress. thus when the plow is to be hoisted no time is lost in compressing the spring and while the plow is in operation, the chains to the `hoisting devicel are kept taut without affecting the position of the plow through jarring, since the springs 16 will absorb any jar.

lVhen in the claims hereto appended I refer to a motor truck, I intend to include a tractor or other suitable source 0f power.

Having now fully described lny invention. what I claim and desire to protect by Letters Patent is 1. In a snow plow. a frame. means for pivotally connecting the frame to a vehicle, a blade pivotally supported from the frame on a transverse axis, a pair of springs carried by the blade, abutments therefor carried by the blade. a common abutment for said springs carried by the frame between the abutments carried by the blade, said springs being arranged in opposition 'and adapted respectively to swing the blade on its axis and yieldingly resistswinging of the blade.

2. A snow plow arranged to be pivotally attached to a vehicle having a frame, a blade spring.

5. A snow plow structure comprism g a support, a plow assembly pivotally secured to the support, means carried by the support for lifting the plow assembly, and a spring connected between said means and said plow assembly, said spring being normally under an initial compreion about equal to the component of the weight of the plow assembly acting thereon to compress the same.

6. A snow plow structure comprising a support, a plow assembly pivotally secured to the support, means carried by the support for lifting the plow assembly, a spring connected between said means and said plow assembly. said spring being normally under an initial compression about equal to the component of the weight of the plow assembly acting thereon to compress the same, and means for adj usting the initial compressionof the spring.

7. ,A snow plow structure including a supporting frame, a blade pivotally supported from the frame on a transverse axis, a pair of opposed springs carried by the blade, abutments therefor carried by the blade, and means located between the abutments and carried by the frame for fixing the positions of the adjacent ends of the springs, said springs being arranged respectively to swing the blade on its Aaxis and yieldingly resist swinging of the blade.

In testimony of which invention, I have hereunto set my hand, at Philadelphia, Pennsylvania, on this 1st day of July, 1926. GEORGE C. ABBE.

pivotally connect-ed to the frame on a transverse axis intermediate the upper and lower edges of the blade. arod pivotally connected to the upper portion of the blade, a spring abutment on the frame through which the rod j extends, an abutment on the rod on each side of the abutment on the frame, and a spring on the rod between each abutment on therod and the abutment on the frame.

3. A snow plow structure comprising a support. a plow assembly pivotally secured to the support. means carried by the support for lifting the plow assembly, and a spring connected between said means and said plow assembly, said spring being normally under an initial stress about equal to the component of the weight of the plow assembly to be lifted.

4. A snow plow structure comprising a support, a plow assembly pivotally secured to the support. means carried by the. 'support for lifting the plow assembly, a spring connected between said means and said plow assembly, said spring being normally under an initial stress about equal to the component of the weight of the plow assembly to be lifted, and

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