US2194594A - Folding automatic hydraulic jack - Google Patents

Description

March 26, 1940. Q J. HALLEY 2,194,594

FOLDING AUTOMATIC HYDRAULIC JACK I Filed March 26, 1937 zsheetysheet 1 //v l/E/V T0,? Joan /1 f/AL 4 EY 6 7 TOR/V5 Y March 26, 1940. J HALLEY 2,194,594

FOLDING AUTOMATIC HYDRAULIC JACK Filed March 26, 1937 2 Sheets-Sheet 2 //v VEN TO f? JOSEPH /7//7L 1. E)

y 7' roe/vie) Patented or. 26, 1940 FOLDWG AUTOTIG .11

' RAKILIC JACK Joseph Halley, Montreal, Quebec, Cda, as-

signor, by direct and mesne assignments, to Bailey's Automatic Hyc .llaclr Syndicate,

Montreal, Quebec,

Application March 26, 193?, aerial No. 133,223

3 ims.

This invention relates to hydraulic lifting jacks, particularly for use on vehicles, and of that kind which are operated by fluid under pressure, the fluid first causing the jack to be moved down from a horizontal or out-of-use position into a position for use and then causing the jack to be expanded in order to lift the vehicle. In arrangements of this kind as applied to motor vehicles, a number of jacks may be permanently attached to the chassis or other part of the vehicle so that they may be moved down into vertical positions, and expanded, when desired, a common fluid storage tank being provided with a pump for supplying fluid to the jacks through suitably disposed pipes or conduits.

The object of the present invention is to provide a lifting jack of the above kind of an improved and simple construction, which is emcient and reliable in action.

Accordingto the invention thehead of the jack is provided with a fluid admission chamber adapted to turn, with the jack, relatively to a fixed vane or partition against which the fluid reacts.

to move the jack angularly into a. position for use. This fixed vane or partition is preferably carried by a stationary shaft about which the jack is adapted to turn, the fluid being supplied through a passage in the said shaft to the admission chamber. In order that the jack may be extended when it has been moved down into a position for use, the vane or partition is provided with an aperture controlled by a valve which is lifted from its seating at the required moment by a pin or projection extending into the fluid admission chamber, so that the fluid then passes into the interior of the jack and expands the latter. The jack may comprise two telescopic parts adapted to be extended by the fluid, the said parts being returned, when the fluid has been released, by a spring or springs. A spring or springs may also be used to return the jack into its horizontal out-of-use position.

In the accompanying drawings:

Figure 1 is a side elevational view of a hydraulic lifting jack constructed in accordance with this invention, showing the same in its OHt-Of-USG position, the dotted lines indicating the position of the jack when brought into aposition for use, but before being extended.

Figure 2 is a vertical section through the Jack upon a larger scale, when in its out-of-use position.

Figure 3 is atop planvlew of the jack partly in section when in its out-of-use position.

Figure 4 is a side elevatlonal view of the jack (@IL car -es) in its out-of-use position, showing the side opposite to that which is illustrated in Figure 1, and

Figure 5 shows a sectional view through the jacl: when partly extended.

Referring to the drawings, the improved jack it, as applied to a motor vehicle, isadapted to be fixed to the chassis of the vehicle, or to any other suitable part, by means of a bracket I5, the latter being adapted to be secured to the vehicle chassis, or other part, by means of an attachment member or plate I6. The bracket id is formed with 9. depending wall]? having an enlarged portion it at one end in which is provided a bearing. Adjacent the said enlarged portion i8 is provided a cross-arm or supporting member 20 which extends horizontally at right angles to the wall ii, the extremity of the said arm extending d0wn- Wards to provide a support M for a stationary :haft 22 about which the jack M is adapted to The jack I d is composed of two tubular telescopic sections 23 and 2d. The inner section M is screwed into a base member 26, while the outer section 23, on the other hand, is screwed into a head 25 fixed to a cylindrical casing 35 which is free to turn, with the jack about the fixed shaft 22. Anannular shoulder 21 isprovided at the one end of the inner section it of the jack, 9. similar shoulder 28 being attached, such as by a screw, to the opposite end of the outer section 23. The two shoulders lessen friction between the parts and cooperate to prevent the jack sections from pulling too far apart. 'A packing ring 29 may be provided adjacent the one end of the inner section, while housed within the latter, as shown in Figure 2, is a pair of coiled springs 33 and 3d disposed one within the other, with the ends of the spring 33 engaging stub- shafts 30 and 32, one fixed to the head 25 of/the Jack and the other carried by a plate 3| fitting within the base or foot portion.

The one-half of the cylindrical casing 35 to which the head 25 of the jack is attached, and which turns about the fixed shaft 22, is occupied at the side nearest the head by a metal block 5! leaving a semi-circular chamber. The fluid for operating the jack is forced by a pump, not shown, through a conduit 56 (Figure 3) into a passage 52 extending axially through the shaft 22 and it enters the said semi-circular chamber in the casing 35 through a. radial passage 4| leading from the passage 52; The said shaft 22 carlies a. fixed paddle, vane, or partition 81 disposed horizontally and dividing the semi-circular fluid admission chamber into two equal compartments ill 2d draw the part 26 of the jack inwards.

45 51) bears.

the jack is moved down into a vertical position,

36 and 35*, as clearly shown in Figure 2 of the drawings. An aperture 38 is formed in said partition and is arranged to be closed by a ball 85, but adapted, when the ball is moved from its 5 seating, to provide a communication between the two compartments 36 and 36", so that the fluid may then pass from the compartment 36" into the compartment 36. A passage 5G extends through the metal block 5| and leads from the compart- 1o ment to to the inside of the inner telescopic part 28 of the jack, while a pin 89 carried by the said block Si is adapted when thejack and the casing 35 turn through a suitable angle to engage the aperture 38 in the vane or partition and move 5 the ball 33 from its seat.

When the jack is not required for use it is held in a substantially horizontal position alongside the bracket i5 which is attached to the vehicle, in which position it is retained by a pin it,

carried by the base or foot oi the inner memat) pressure and the foot of the jack is clear of the ground, by means of the springs in and 5b which are located within a tubular casing Q6 anchored at its one end to the outer part 23 of the jack. The spring it, which is a tension spring, passes through a central hole in the opposite end of the casing id, and is disposed within the spring which is of the compression type, the one end of the latter spring bearing against a flange till surroundingthe central hole through which the 40 spring it passes. The outer extremity of the tension spring at is anchored to a hook 35 attached to the cross-arm 2t and its inner ex= tremity is attached to a movable plate 69 against which the inner end of the compression spring The arrangement is such that when as illustrated in Figure I, the tension spring 418 is elongated, moving the plate is towards the upper part of the casing idand thereby compressing the spring $0. Both springs in this manner combine to eiiect the raising of the jack, when the latter is not required for use.

When it is desired to bring the jack into use the fluid, which may be oil, is forced by the pump (not shown) through the conduit 56 (Figure 3) and enters the axial passage 52 in the fixed shaft 22, being forced into the compartment 36 through the radial branch passage M. The fluid fills the said compartment and maintains the ball a0 38 against its seat. Since the fluid cannot escape it coacts with the fixed partition 3'! (which fits close up to the wall of the semi-circular chamber) and causes the jack to move down angularly about the shaft 22 towards a vertical position, the pressure of the ,fluid which effects this turning movement first causing the pin 82 -to disengage from the notch 43, the inner part of the jack moving slightly outwards against the restraining action of the springs 33 and 34.

When the jack has nearly reached a vertical position the pin 39 enters the aperture 88 and raises the ball 38 from its seat. The fluid now passes through the said aperture into the compartment areas and is forced through the passage 46 into the inside of the inner telescopic part 26 of the jack. This part 24 is now forced downward by the fluid, against the action of the springs 38 and 86, until it reaches the ground, when the outer part 33 of the jack rises (since the jaclc continues to extend) and lifts the vehicle.

When the fluid is relieved of the pressure the weight of the vehicle, assisted by the springs 83 and it, cause the jack to collapse, the part to sliding partly within the outer part 23, the collapsing movement being continued after the foot or base 26 of the jack has left the ground by the springs, until the two telescopic parts 23 and 243 he one within the other. Further, as soon as the base or foot it of the jack leaves the ground the jack is moved angularly bythe springs 38 and 5t back into its horiontal out-of-use position shown in Figure 1, the pin 32 on the base or foot springing into the retaining recess 33.

A separate Jack of the above construction may be provided for lifting each'wheel of the vehicle, the fluid beingsuppliecl by the pump from a common reservoir, and any particular jack being brought into use as occasion requires.

The springs 33 and 3d are arranged, in substantially the same manner as the springs 68 and 5b, the inner spring 36, which is a tension spring being attached atone end to the stubshait it and at its other end to the stub-shaft 32 which is carried by the plate Si, the latter being loose within the inner part 2d of the jack. The spring 86, on the other hand, is of the com-- pression type, its one end bearing against an internal flange 2d at the top of the inner part of the jack and at its other end bearing against the plate ill. Thus, when the jack is extended the sioned and the two springs cooperate to efiect the collapsing oi the jack when the fluid is relieved of the pressure.

What I claim as my invention is:

, spring 3% is compressed and the spring 33 ten- 1. A hydraulic Jack including an outer cylindrical jack section, an inner telescopically engaging Jack section, a. spring urging the sections into contracted positions. hollow partially cylindrical head carried by theupper end of the outer jack section, and having a port leading into said section, a tubular shaft upon which the head is mounted for rotative movement, a paddle mounthas rotated a predetermined distance to thereby able therewith into engaging and disengaging ptnitions relative to said check valve.

3. A hydraulic jack as set forth in claim 1, characterized by spring devices for normally holding the jack in its inoperative elevated position and also acting to aid the aforesaid spring in urging the secticns into contracted positions.

JOSEPH HALLEY.

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