US1228586A - Lifting-jack. - Google Patents

Description

0/0. MULVIHILL;

LIFTING JAEK. APPLICATION FILED 1 58.23, 1911.

mmswm Patented June 5,1917.

DANIEL C. MULVIHILL, F HANNIBAL, MISSOURI.

LIETING-J'ACK.

To all whom'it may concern:

Be it known that I, DANIEL C. MuLvIHmL,

a citizen of the United States, and a resident of Hannibal, countyof Marion, and State of Missouri, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is declared to be a full,;clear; and exact description. I

This invention relates to lifting jacks, and its principal object is to provide a,jack designed especially for use in lifting automobiles. Another object is to provide a jack adapted to be operated by compressed air. Another object is to provide a jack, the ,column or post of which may be instantly adjusted with respect to the axle or frame of the automobile, and thereafter the jack is operated by compressed air. Many of the I automobiles and other motor'vehicles now in use, are equipped with an air pump driven by the motor, for inflating the tires;

sufiicient pressure may be developed with such a pump to operate the present jack.

The invention consists in the several -novel' features hereinafter fully set forth and particularly defined in the appended claims.

The invention is clearly illustrated in the drawing, accompanying thisspecification, which shows a simple embodiment of this invention in central vertical section.

In the embodiment of the invention illustrated in said drawing, the reference numeral 1, designates a cylinder closed at its lower end by a bottom wall 2, which forms open, externally screw threaded upper end,'

a base for thejack. :The cylinder has an which is closed by a'cap 3, having a downwardly extending flange 4,'threaded upon the upper threaded end of the cylinder. The cylinder is provided with a handle 5, by

means of which it may .be handled, and.

the upright" member 6, of said handle and horizontal member 7 are provided with connected air passageways 8 and 9, leading from the lower end of the interior of the" cylinder 1. In the passageway 9, is an air valve 10, of the ordinary check valve type I A employed in pneuInatic tires, and said valve opens in the direction of the arrow at, and is arranged to be coupled with a flexible connection that may run to an air pump (not 'ofthe "valve, which cap must be shown) such as is ordinarily employedin connection with the motors of automobiles.

have shown a screw threaded cap 11, screwed on the threaded neck of the body unscrewed v Specification of Letters Patent.

cured to it. "At the upper-endof the pas Patented Jame 5, 1am; Application filed February 23, 1917. Serial No. 150,316.

sageway 8, is a second air'valve 12, which.-

may be of the same construction as the valve 10, and said air valve ,opens .in the direction of the arrow 6. Said air valve 12, is screwed into-theopen internally screw threaded end i" i of the handle 5, and its protruding-end may be covered by acap 1 3,'which has threads and is provided with a discharge aperture plunger stem of the air valve. down upon the-stem 15, the

cylinder, may be permitted to escape.

Within'the. cylinder 1, is a plunger or pis- I ton 16, which is provided with a tubular '14. stem 15, is guided into the upper end of the cap 13, and engages- With the By pressing air'valve isopened whereby the air, contained in the;

stem 17 guided in a neck 18, formed upon the cover. 3. The plunger or piston 16, is

provided. with an ordinary cup washer 19,

secured to its lower faceby' a ,disk 20, and

cap screws 21. Whenthe plunger or piston is inits lowermost positioh, the cap screws rest on the bottom or base 2,1.of the cylinder,

and support the piston and its washer away from the bottom of thelcylinder whereby air may enter the cylinder below the cup washer. Resting upon the upper end of the tubular stem 17, is a nut22, which is threadd upon a screw threaded post or column 23, that ex- 1 tends down into the hollow of the tubular stem 17. The upper end of the post or dolurnn 23, is provided with a head or bearing plate 24, which is adapted to be placed underneath the axle or frame of an automobile when it isdesired to use the jack for the purpose of lifting said end of the frame.

axle or frame of the automobile, and the nut 22, is turned upon the screw threadedpost or standard 23, to. raise the head orbearing plate 24,and bring it into contact'with the underside of the axle or frame. The cap 11, of the air valve 10, is then unscrewed and In use, the jack is placed underneath the the air valve is coupled with the flexible stopped. To lower the automobile, the stem 65 that engage with the body of the valve 12,

15, is depressed, thereby opening the air valve 12, permitting the escape of the compressed air out through the air vent 14, of the cap 13. I More or of construction described is possible, without departing from the spirit of this invention; I desire, therefore, not to limit, myself to the exact form of construction shown and described, but intend in the following claims to point out all of the invention disclosed herein.

, I claim as new, and desire to secure by Letters Patent:

1. A lifting jack comprising a compressed air cylinder, a plunger sliding therein and having a tubular stem, a screw threaded post slidably held in said stem, a nut threaded upon said post and resting upon the upper end of the stem, a handle formed integral with said cylinder and having an air passageway therein, opening to the interior of the cylinder, and a valve screwed in said handle and opening to the passageway and adapted for connection with a flexible air connection.

2. A lifting'jackcomprising a compressed air cylinder having a hollow handle formed integral therewith, the hollow of the handle opening to the interior of the cylinder, an air valve screwed in the hollow of said handle and adapted for connection with a flexible air connection, a cap secured to the upper end of said cylinder, a plunger sliding in said cylinder and having a tubular stem guided in said cap, a screw threaded post slidably held in said stem, and a nut threaded upon said post and resting upon the upper end of said stem.

3. A lifting jack comprising a compressed air cylinder closed at the bottom and open less variation of the exact details at the top, a cap screwed upon the open end of said cylinder, a hollow. handle for said cylinder, the hollow opening to the interior of the cylinder, an air valve in the hollow of said handle and adapted for connection with a flexible air connection, a plunger sliding in said cylinder and having a tubular stem.

guided in said cap, a screw threaded post sliding in said tubular stem, and a nut threaded upon said post and resting upon the upper end of said stem.

4. A lifting jack comprising a compressed air cylinder having a hollow handle, the hollow of which communicates with the interior of said cylinder, an air valve in the hollow of said handle and arranged for connection with a flexible air connection, a second air valve secured in said handle and communicating with the hollow thereof, a plungerin said cylinder and having a tubularstem, a screw threaded post sliding in said tubular stem, and a nut threaded upon said screw threaded post and resting upon the upper end of said tubular stem.

5. A lifting jack comprising a compressed air cylinder, closed at the bottom and open at the top, a screw threaded cap secured upon the upper open end of said cylinder, said cylinder being formed with a handle having an air passage leading to the interior of the cylinder, an air valve in said passageway, adapted for connection with a flexible air connection, a second air valve in said passageway, a plunger sliding in said cylinder having a tubular stem guided in said cap, a screw threaded post movable lengthwise in said tubular stem, and a nut threaded upon said post and bearing upon the upper end of said tubular stem.

DANIEL C. MULVIHILL.

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