US2097853A - Automobile lift - Google Patents

Description

Noy. 2, 1937,

c. J. BRISTOL AUTOMOBILE LIFT Fil ed March 1, 1937 III Patented Nov. 2, 1937 than STATES AUTOMOBILE LIFT Cyrus J. Bristol, Des Moines, Iowa, assignor to Globe Hoist Company, Des Moines, Iowa, a

corporation of Iowa Application March 1,

2 Claims.

My invention relates to that class of automobile lifts in which an upright cylinder is provided and a plunger therein is raised and lowered by fluid pressure. In hoists of this kind it is nec- 5 essary to have a plunger bearing at the top of the cylinder, and also a second bearing spaced below the first to prevent lateral movement of the upper end of the plunger when elevated, and lifts of this class were usually provided with means for positively limiting the upward movement of the plunger, and such means were necessarily located in the space between the plunger and cylinder and, hence, were not readily accessible, and considerable time and effort were required to remove the plunger from the cylinder.

The object of my invention is to provide means of simple, durable and inexpensive construction for readily, quickly and easily removing or replacing the plunger and also positively limiting the upward movement of the plunger.

Referring to the accompanying drawing, Figure 1 shows a vertical central sectional View through a part of an automobile hoist mechanism embodying my invention.

25 Figure 2 shows a transverse sectional view on the line 2--2 of Figure 1.

Figure 3 shows a detail vertical central sectional view illustrating the lower portion of the plunger and cylinder, and illustrating the stop arms in their withdrawn position; and

Figure 4 shows a sectional view on the line d- I of Figure 1.

The reference numeral I indicates an upright cylinder of ordinary construction open at its upper end and closed at its lower end. At the upper end of the cylinder there is fixed a plunger bearing II, and at a point spaced below the bearing I I is a combined plunger bearing and stop member I2 firmly fixed in position on the cylinder by rivets or the like. This bearing member and stop is preferably formed with passageways I3 so that fluid may freely move up and down past it.

Slidingly mounted within the cylinder is a cylindrical plunger I I open at its top and having a plunger head I5 fixed in position spaced above its lower end, and in this lower end of the plunger which extends below the head is a series of openings I6, for purposes hereinafter made clear. A screw-threaded rod I1 is rotatably mounted in an upright position in the plunger head I5, and it is provided at its upper end with an enlarged head I 8, and between the head I 8 and the plunger head I 5 is a washer I9. Mounted on the lower end of the screw-threaded rod I I is a nut 20, and pivoted to this nut are four arms 2| extended 1937, Serial No. 128411 (Cl. 254-93 outwardly through the openings I6 in the plunger. The head I8 is provided with a transverse slot 22, or the like, adapting it to be engaged for turning by an ordinary wrench or like implement, and this may be done by inserting the implement through the open top of the plunger.

In practical use the plunger bearing and stop member I2 is riveted or otherwise firmly fixed in position. When it is desired to insert the plunger the nut is moved to the position shown in Figure 3, so that the arms 2| are withdrawn, thereby permitting the plunger to be readily and easily inserted within the cylinder past both of the bearings therein. When this has been done the operator inserts a wrench or the like through 15 the open upper end of the plunger and engages the head I8 and rotates it until the nut 20 firmly engages the under surface of the plunger head I5, and when this is done a, fluid-tight joint is provided at the point where the screw-threaded rod passes through the plunger head. At the same time the arms 2| are caused to project outwardly beyond the plunger, and they are firmly held in this position. Obviously, when fiuid pressure is applied within the cylinder the plunger will be elevated, and when the arms 2| reach the stop device I2, the upward limit of the plunger will be stopped and the plunger will have two spaced apart bearings for firmly holding it against lateral movement when in its maximum elevated position.

In practice I have found that a very substantial saving in the original cost of this part of the lift device may be effected by means of my improvement, and a very substantial saving in both time and labor is eilected when it is desired for any reason to remove and replace the plunger.

I claim as my invention:

1. In a hoist, the combination of an upright cylinder open at its upper end, a plunger slidingly mounted in the cylinder and open at its upper end and provided with a lower head spaced above the lower end of the cylinder, the projecting lower end of the plunger being formed with guide openings, two plunger bearings fixed to the cylinder, one at its upper end portion and the other spaced below the first, a screw-threaded rod extended through and rotatably mounted in said piston head, having its upper end shaped to re- 50 ceive an implement for rotating the rod, a nut mounted on the rod below the piston head and arms pivoted to the nut and extended through the openings in the lower end of the plunger, said arms being so shaped that when the nut is at its upper limit the outer ends of the arms will project beyond the plunger and co-operate with 'the lower bearing on the cylinder to limit the upinder, one at its upper end portion and the other spaced below the first, a screw-threaded rod ex-' tended through and rotatably mounted in said piston head, having its upper end shaped to receive an implement for rotating the rod, a nut mounted on the rod below the piston head and arms pivoted to the nut and extended through the openings in the lower end of the plunger, said arms being so shaped that when the nut is at its upper limit the outer ends of the arms will project beyond the plunger and co-operate with the lower bearing on the cylinder to limit the upward movement of the plunger, and when the nut is at its lower limit, the outer ends of said arms will be withdrawn to permit the removal of the plunger from the cylinder, said screw-threaded rod having a head at its upper end and a washer between said head and the upper surface of the piston head, and whereby when the screwthreaded rod is at its lower limit of movement fluid from the interior of the cylinder will be prevented from entering the plunger.

CYRUS J. BRISTOL.

Images