US696558A - Lifting-jack. - Google Patents

Description

Patented Apr. l, 1902.

L. B. GDOIJWEN.

LIFTING JACK.

(Application filed June 8, 1901.)

(No Model.)

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lUNTTEn STaTEs PATENT @EETEE.

IJANDON R. GOODWIN, OF ARLINGTON, NEW JERSEY, ASSIGNOR OF ONE- IIALF TO JOSEPH B. BRAY, OF NEW'ARK, NEWV JERSEY.

LIFTHNG'JACK.

SPECIFICATION forming part of Letters Patent No. 696,558, dated April 1, 1902. Application filed June 8, 1901. Serial No. 63,752. (No model.)

To all whont it may concern:

Be it known that I, LANDONR. Goonwm, a citizen of the United States, residing at Arlington, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements'in Lifting-Jacks; 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.

My invention relates to improvements in lifting-jacks; and it consists in the novel features of construction hereinafter described, reference being had to the accompanying drawings, which illustrate one form in which I have contemplated embodying my invention, and said invention is fully set forth in the following description and claims.

Referring to the drawings,Figure 1 is a perspective view of my improved jack, and Fig. 2 is a vertical section of the same.

The object of my invention is to provide an improved jack wherein the adjustment and lifting action are accomplished by one operation, thereby saving time and labor.

In carrying out my invention I provide a base A with a longitudinal opening a. extending through the entire length thereof, and also with a slot a through one 'side and continuing up to the joint a as shown. On the opposite side and near the top of said base two ears a a and a small opening a are provided for the purpose of receiving a pin a carrying apawl a This pawl projects through the opening a, as shown in Fig. 2, for apurpose hereinafter described, and is provided with an actuating-spring a Operating within the longitudinal opening a is a bar 13, provided on the side adjacent to the pawl a with ratchet-teeth, forming a rack upon which said pawl a operates. The upper portion of this bar extends beyond the top of the base for carrying the head 0. A pin 1) is. secured in the bar B. The bar B is further provided with a pin 6 projecting from the side thereof, for the purpose of preventing the said bar from being withdrawn from the base. Thisis brought aboutby the said pin coming in contact with the part a of the base.

The head 0 is composed of the two centerin g-arms c c and the downwardly-eXtending casing 0 This casing is so constructed that it is free to slide on the bar A and has a longitudinal slot 0 in one side thereof adapted to receive the pin 6, which limits the movement of said head. The casing O is further provided with studs 0 0 having mounted thereon suitable friction-rollers 0 0 as sho wn. These rollers are retained on the said studs by means of pins passing through openings in the ends thereof.

At a point in the bar B below the limit of the downward movement of the head C is swiveled,by means of a pin 1) running through the 'said bar, a pair of lifting-cams D D. These cams are in this instance integral with a handle E, which normally, by reason of its weight, assumes the position illustrated in Fig. 2, and each is provided with a lockingnotch adjacent to the handle, as shown at d d, for a purpose hereinafter set forth. The cams above mentioned are so constructed and arranged with reference to the head that they will engage the friction-rollers c c and raise the same.

I prefer to form the handle E of two parts, one sliding upon the other, to give greater length to the handle and increased leverage in operating the device. In the drawings a part E is shown as sleeved upon the free end of the handle E. This part E is provided with a slot e, which is engaged by a stud or pin 6 in the handle E, limiting the movement of the part E and preventing its removal from the part E. This extensible feature of construction enables me to increase the leverage of the handle in operating the device and at the same time by sliding the part E toward the fulcrum of the lever permits the handle to be folded close to the base for storage or shipment.

In operating the device the bar B is raised vertically until the arms on'the head engage the article to be operated upon or as near thereto as may be allowed by withdrawing the bar B from the base. The pawl then engages the tooth which is nearest it on the rack and prevents the said bar from sliding back. The handle is then swung outward upon the pin b as a pivot. This operation forces the cams against the rollers c and c and raises thehead O. The handle is raised far enough to allow the rollers to engage the locking-notches d d on the cams, which will retain the handle, and consequently the head, in a raised position. In the act of raising the handle the part E is slipped outward to give the greatest possible leverage.

What I claim, and desire to secure by Letters Patent, is

1. In a lifting-jack, the combination with the hollow base provided with a retainingpawl, of a vertical bar adapted to slide vertically in said base and provided with teeth to engage said pawl, a vertically-sliding head mounted on said bar, and provided with laterallyprojecting friction-rolls, and a lever pivoted to said bar, and adapted to hang normally below its point of pivoting, said lever being provided with bifurcated cam portions for engaging said friction-rolls, substantially as described.

2. In a lifting-jack, the combination with the vertical bar, of a sliding head engaging the upper part of the same, a lever provided with curved or cam bifurcated arms pivoted at their extremities to said bar, whereby said lever normally hangs'below its point of pivoting and friction-rollers projecting laterally from said head and engaging said curved or cam arms, whereby the upward movement of said lever will raise said head, substantially as described.

3. In a lifting-jack, the combination with the vertical bar, of a sliding head mounted on the upper end of said bar, said head being provided at its upper end with laterally-extending centering-arms, provided on their upper faces with grooves or depressions, said head being provided at its lower end with latorally-extending friction-rollers, a lever provided with bifurcated curved or cam portions, pivoted at their extremities to said vertical bar, and engaging said friction-rollers, said lever normally hanging-downward from its pivotal connection with said bar, whereby the upward movement of said lever will raise said head, substantially as described.

In testimony whereof I aflix my signature in the presence of two witnesses.

LANDON R. GOODWVIN.

Witnesses:

J. H. WHITAKER, GEORGE M. BOND.

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