US1548373A - Lifting jack - Google Patents

Description

1,548,373 J. A. MORRISON LIFTING JACK Filed Oct. 4. 1924 2 Sheets-Sheet 1 gwuentow John AMorrllvon Aug. 4, 1925. 1,548,373

J. A. MORRISON LIFTING JACK Filed Oct. 4. 1924 2 Sheets-Sheet 2 MI W -, J0 hn-A.M0rrison -$M g MW Patented Aug. 4, 1925.

JOHN A. MORRISON, OF MANSFIELD, OHIO.

LIFTING JACK.

Application filecl October 4, 1924. Serial No. 741,632.

To all whom it may concern. I

Be it known that 1, JOHN A. Monnisoiv, a citizen of the United States, residing at Mansfield, in the county of Richland and State of Ohio, have invented certain new and useful Improvements in Lifting Jacks, of which the following is a specification.

This invention relates to lifting jacks such as are used for raising automobiles in order to permit a tire to be removed or repaired, and the objects of the improvement are to provide a jack having a single lifting bar carrying a plurality of lifting heads located at different heights upon the bar, and so arranged that any one of the lifting heads may be easily and readily used to engage the spring or aXle of the automobile to be hit ed; the several heads at different levels permitting the jack to be quickly brought into use under varying conditions.

It is also an object of the invention to provide at least one of the lifting heads upon a rigid arm located at an angle to the normal plane of the lifting bar, in order that any one of the heads may be used without interference by the other heads; means being provided upon the angular arm for engagement with the side of the spring or other part of the automobile to prevent bending of the lifting bar when the load is carried at one side thereof; to prevent the jack from tipping or tilting under the weight of the automobile when the lifting bar is raised, and to prevent the spring or other part of the automobile from coming into sliding Contact with the housing of the jack during the raising or lowering of the lifting bar.

The above and other objects may be attained by constructing the jack in the manner illustrated in the accompanying drawings, in which Figure 1 is an elevation of the liftingjack, the spring of an automobile being shown in dotted lines contacting with the lifting head upon the angular arm;

Fig. 2, a detail perspective view of the lifting bar;

Fig. 8, a top plan view of the ack; and

4, a longitudinal sectional view of the same.

Similar numerals refer to similar parts throughout the drawings.

The standard within which the lifting mechanism is carried, comprises a housing 1 which may be skirted as shown at 2, and

provided with an integral base portion 3 arranged to rest upon the ground or floor when the jack is in use.

The lifting bar of the jack is in the form of a rack bar 4, preferably slidably mounted within the housing 1 and meshing with the pinion 5 which is fixed upon the shaft 6 journaled in suitable bearings in the housing and carrying the worm gear 7, which meshes with the worm 8, a suitable gear housing 9 being provided to accommodate the worm and gears.

The outer end of the worm shaft 10 may be provided with a suitable socket 11 for the reception of the shank of the usual handle or tool, by means of which the worm is rotated to operate the lifting bar.

A lifting head 12 is provided upon the upper end of the lifting bar and is preferably of the form shown in the drawings,

provided with a socket 13 which receives the conical stud 14 upon the upper end of the lifting bar, a transverse pin 15 connecting the head to said stud and permitting a slight oscillation of the head in order that the same may adjust itself to the position of the automobile to be lifted.

A longitudinal rib 16 is formed upon the rear side of the lifting bar and arranged for slidable movement within the vertical slot 17 formed in the rear side of the housing 1. A rearwardly extending bracket arm 18 is formed near the lower end of the rib 16 and provided at its outer end with an upright stud 19, upon which is mounted a lifting head 20, similar to the head 12.

An angular arm 21 extends outward to one side of the housing from a point upon the rib 16 above the arm 18, and is provided upon its extremity with a lifting head 22, similar to the heads 12 and 20. An angular flange 23 is formed upon the rib 16 and extends to a point near the head 22, the outer edge 24 of said flange terminating beyond theplane of the adjacent side of the housing 1.

In operating the jack, either of the heads 12, 20 or 22 may be engaged with the spring as indicated at A, or other suitable portion of the automobile to raise the same. In the event the head 22 is used for lifting, the entire weight is carried at. one side of the lifting bar and there is a tendency for the jack to tilt toward the load until the housing engages the spring or other part of the vehicle.

Asshorw-n :iniFigs. 1 and {3, when the head 22 is used, the s ring A Will engage the outer edge 24 of she angular flange 23 and as the lifting bar is raised, :the jack can nottilt toward the load and the spring cannot come into sliding contact With the housing 1, thus eliminating the friction which would otherwise be produced.

I olaimz- 1. A lifting jack including a housing, a lifting bar Within the :housing, and lifting arms carried at different heights upon the bar, one of the arms being located at an angle to the other arm.

2. A lifting jack including a housing, a lifting bar Withinthe housing, a rib upon one side of the bar and lifting arms carried at different heights upon the nib, one of the arms being located at an angle to the other arm.

3. A lifting jack including a housing, a lifting bar Within the housing, an angular lifting arm upon the lifting bar and an angular flange upon the lifting bar extending beyond the plane of the housing.

4:. A lifting jack including a housing, a

lifting bar Within the housing, an angular lifting arm upon the bar and having a head at its outer end portion, and an angular flange upon the lifting bar terminating near said head.

In testimony that I claim the above, I have hereunto subscribed ,my name.

JOHN A. MORRISON

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