US2967735A - Wagon hoist - Google Patents

Description

- Jan. 10, 1961 v. J. LUNDELL 2,967,735

WAGON HOIST Filed Jan. 5, 1955 2 Sheets-Sheet 1 Vernon J Lunae// IN V EN TOR.

Jan. 10, 1961 v. J. LUNDELL WAGON HOIST 2 Sheets-Sheet 2 Filed Jan. 5, 1955 INVENTOR. 1 6/7700 I 411/0042 WAGQN HOIST Vernon J. Lundell, Cherokee, Iowa Filed Jan. 5, 1955, Ser. No. 479,995

1 Claim. (Cl. 298-22) My invention relates to a Wagon hoist.

An object of my invention is to provide a wagon, hoist which will readily raise the forward end of a wagon so that the contents thereof will pass out of the wagon.

A further object of my invention is to provide a hoist which is simple in construction, economical to manuu d; which doe not equir h use umb rsome tracks or other arrangements.

A further object of my invention is to provide a hoist in which hydraulic pressure is used to raise the hoist, and to further provide a hoist which need be attached only at one portion of the wagon.

A further object of my invention is to provide a unit in which the pressure is applied laterally instead of longitudinally of the wagon to provide a strong bracing type of hoist and yet which is of maximum efriciency.

With these and other objects in view, my invention consists in the construction, arrangement, and combination of the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claim, and illustrated in the accompanying drawings, in which:

Figure l is a forward elevation of the hoist in its collapsed position,

Figure 2 is a forward elevation showing the hoist in its raised position,

Figure 3 is a sectional view of Figure 2 taken along the lines 3-3 thereof,

Figure 4 is a side elevation of the complete Wagon box and hoist, and

Figure 5 is a detail.

My invention contemplates the provision of a wagon hoist for raising pivoted wagon boxes which is easy to install and which works smoothly and at maximum efficiency.

I have used the character It) to indicate a wagon box which is pivoted at 11 to the vertical members 12 which are attached to the rear axle 13 of the wagon, the character 14 indicating the forward transverse axle, the character 15 indicating a brace.

The character 16 indicates the equally spaced transverse beams which are secured to the longitudinally positioned parallel beams 17, there being a pair of such beams 17 in the usual wagon construction.

Attached to the forward axle 14 is a spacer 18 to which is attached the lateral beam 19, to which beam 19 are attached the members 20.

Receiving the transverse beam 19 is a channel member 21 to which is rigidly secured the spaced pipes 22, and passing through the pipes 22 are the lengthened bolts 23 which are secured to the arms 24, the arms 24 also including the upper bolts 25 and 26, it being noted that there are two pairs of arms 24. Pivotally secured to one of the bolts 25 is the end 27 of a hydraulic cylinder 28 which includes a suitable piston therein, to which piston is attached the piston rod 29, which rod 29 is journalled at 30 onto the transverse bolt 26.

Pivotally attached to the terminals of the arms 24 are '1? aired tates Feimi 5 i the further bars 31 which are loosely pivoted thereto at 32, the pivoting at these points being within fairly large openings or within slots 33 (see Figure 5).

The arms 31 are pivoted at 34 to the ears 35 which ears 35 are securely attached to the ends 36 of a framework having the further sides 37, the ends 36 being securely attached in any desired manner to the beams 17, the bars 31 being thereby freely pivoted at the ears 35, the characters 38 and 39 indicating suitable spacers.

Pivotally attached to one of the arm members 24 at 39a is an equalizing bar 40, Which is pivotally attached at 41 to a further bar 42 which is welded or otherwise secured to one of the other arms 24 as shown.

Communicating at 43 with the cylinder 28 is a flexible hose 44 which in turn communicates to any desired hydraulic oil source. 7

The hoist operates in the following manner. In its collapsed position as shown in Figure 1, or with the wagon box down, it will be noted that all of the various arms 24 and bars 31 are at the lowest possible point. When it is desired to raise the forward end of the wagon box, the oil is forced through the tube 44 and into the cylinder 28, which correspondingly causes the piston rod 29 to travel in the direction of the arrow 45 (see Figure 2). For a certain interval, there will be no lifting effort exerted due to the relatively large clearances between the pivot bolts 32 and the openings in which these bolts are received, or due to the slots 33, it being understood that either form can be used as long as a lost-motion connection is provided.

These points will remain relatively stationary until the bolts 25 and 26 reach the dotted positions shown in Figure 1, at which point the lever arm between the bolts 25 and 26 and the points 23 will be at its greatest, and at this point where the greatest pressure is required, or at the initial lifting of the Wagon box, the arms 24 will begin to rotate towards an upper position, until they reach the position shown in Figure 2, or even a higher position than this, and during the rotation of these arms, the arms 31 Will also be raised, and since these arms are pivoted at 34 to the framework portions 36 etc., which are attached solidly to the wagon framework, the effect will be to raise the forward end of the wagon, and it will also be noted that the lower channel member 21 will be pivoted upwardly (see Figure 3) as the wagon box is raised since the bars 31 and arms 24 will be at constantly to this channel member 21, this feature allowing for free pivoting of the unit regardless of the'height to which the end of the box is raised.

It will thus be noted that the piston will apply the greatest pressure Where necessary, and as the pivoting points 25 and 26 pivot outwardly and as the wagon begins to lift, the pressure will diminish. However, during the upper portions of the raising action the pressure will not be as great, yet due to the angular change, the raising effect will become more rapid, so that as a result, the desirable condition of providing the maximum pressure at the initial raising, and a faster action from then on will provide a highly desirable wagon hoist arrangement.

It will be noted that the hoist will thereby raise or collapse in a smooth and uniform manner, and it will be noted that since the unit is attached to the wagon box itself, it can be conveniently attached toward the forward end, and need not be attached to the member 19 for instance, and in this way can be provided a simple compact unit.

The equalizing bar 40 will equalize the various arms so that they will work in a synchronized manner.

It will now be seen that I have provided the advantages mentioned in the objects of my invention with various other advantages being readily apparent.

Some changes may be made in the construction and arrangement of the parts of my invention without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claim any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope.

I claim as my invention:

A wagon box hoist comprising a lower base member, a pair of spaced arms pivotally attached at one end of said lower base member, a further pair of spaced arms pivotally attached to the other end of said base member, means for spreading said pairs of arms apart, bars pivotally secured to the outer terminals of said arms, the upper terminals of said bars being pivoted to a wagon box to raise the same, said means for spreading said arms apart comprising a hydraulic cylinder, a piston in said cylinder, a piston rod attached to said piston, the end of said piston rod being pivotally secured to said further pair of said arms at a distance from the pivotal attachment of said further arms to said base; said base, said arms, and said bars operating in a plane parallel to the axis about which the wagon box is pivoted, a framework including ears, means for pivotally attaching the upper ends of said bars to said ears, means for securing said framework to said Wagon box, the pivotal connection betweeen said arms and said bars being relatively loose to provide a lost motion action, a synchronizing bar pivotally attached to said arms on one side of their pivot and to an extension of said further arms on the opposite side of their pivot, said arms and said further arms being substantially in the shape of elongated triangles, one of the corners of the shortest side of said triangles being pivoted to said base and the other corners on the shortest side of said triangles being pivoted to said cylinder and said piston rod.

References Cited in the file of this patent UNITED STATES PATENTS 463,254 Pay Nov. 17, 1891 1,854,212 Miller Apr. 19, 1932 2,180,066 Porter Nov. 14, 1939 2,541,210 Cunningham Feb. 13, 1951 2,588,489 Day Mar. 11, 1952 2,621,021 Dahl Dec. 9, 1952 2,706,102 Cresci Apr. 12, 1955

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