US2563912A - Jointed hydraulic jack lever - Google Patents

Description

Aug. 14,'1951 u@ Il@ J. A. BELINKIN JOINTED HYDRAULIC JACK LEVER Filed Jan. 30, 1946 /NvEN-roR JUL/US' A. BELINK/N Patented Aug. 14, 1951 UNITED STATES PATENT OFFICE JoIN'rED HYDRAULIC JACK LEVER Julius A. Beunkih, New York, N. Y.

Application January 30, 1946, serial N0.'644,2i3 Y LClaim.-

* l This invention relates to new and useful improvements in lifting j'acks and has especial reference to one for use in connection with automobiles.

An object of the invention is toy provide' a strong, durable, eflcient jack comprised of a minimum number of simple economically manufactored parts so as to maintain the highest efficiency in operation", durability in use, and the lowest cost of production.

A further object is to provide a few simple parts which can be readily assembled and disassembled for repair and replacement and. in vwhich the parts containing valves and valve seats can be very economically andeasily machined at low cost.

A still further object is to' provide a simple handle which can depend from ano'pei'ating link and yet be instantly moved into ailigixnientI therewith to form a continuation thereof when the jack is to be operated;

Further and more specific objects, features, and advantages will more clearly appear from the specification hereinafter set forth especially when taken in connection with the accompanying drawings which illustratea present preferred form which the invention assumes and which forms part of' the specificati-on.

In brief and general terms-v, the invention com'- prises a jack having a central body casting or portion from the upper" surface of' which extends an integral sleeve acting as' a cylinder for' a piston operable by a' suitable handle connection to be later detailed. To the 'top of the body portion an inverted tank element is fastened to form an enclosure for fluid and including therein the piston. To theV lower portion of the' casting -is fastened a power' cylinder which rides a power piston suitably connected to' a baseportion in any desired manner. The casting has a passage extending straight through from the power cylinder to the` tank and containing therein an outlet valve preferably of the' spring' press ball type. An inlet valve of a similar type is disposed within the lower portion of the firstmentioned piston reciprocating in thev sleevel and upper portion of the casting passage, This" piston has a passage in it containing the inlet valve and extending up to a point above the top of the sleeve and connecting directly to the fluid in the tank.

The upper end of the pump piston first mentioned extends through the top of the tank and is connected to a pivoted link which has an end slot running lengthwise thereof. A slotted handle 2 depends" from the end of the leg by a pin and normally when not in use hangs downwardly alongside the tank but can be swung into alignment with the link and then moved into the slot therein to form a straight line continuation thereof for the purpose ofoperating the pump piston. This gives a simple handle arrangement which is not in the way when out of use and yet which can never bedisplaced or lost and can be moved from one position to the other in a matter of seconds.

A further feature relates to the fact that the valve for the inlet of tank fluidthrough the pump piston is contained entirely within the piston and that the valve for the inlet of fluid into the power cylinder is lcontained entirely within the body casting. At all times the passage in the pump piston connecting to the tank uidis open thereto. This construction is extremely simple, economical to manufacture and involves a minimum of parts and any grinding or machining.' is reduced to a minimum.

The present preferred form which the invention may assume is shown in the drawings of which,

Fig. l is a ver-tical` cross section through the apparatus; and, v

Fig. 2- is a cross section taken on the line 2-2 of Fig 1.

Beginning rst with the actual construction andphys-ical relation of the parts and leaving the description of the operation and functioning of the elements to alater portion of this specification, itis toY be seen that the jack-has a base f portion lll; which in section is concave to the The large piston I3 projects upwardly into thel main jack cylinder pipe I6 the lower end of which is threaded to receive a cup-shaped cap I1 to house a packing ring i8 and a gasketV I9. AV lock-nut 20 holds these parts in set position to prevent.leakager To the mid-portion of the pipe I6 is fastened the bumper hook 2| attached to a collar or hub 22 the oblique shape of which provides lesser pressure on the. pipe l@ with the same lifted weight. The hook 2I` is provided with cross grooves 23 or serrations to engage the bumper and prevent slidingthereof.

`The upper end. of the cylinder pipe I6 is threaded into a bore 2.4 whichv forms part of the main pressure cylinder of the jack and into this cylinder 24 the upper end of the main piston I3 also extends. 'I'he pipe |6 which forms the rest of the cylinder is sealed at its upper engagement with the bore 24 by means of packing 25 and a lock ring 26. The cylinder 24 is formed in the lower portion of the body block 21 of the jack. The top of the block is formed as an integral sleeve 28 and embraces a passage 29 in which slides the lower end of a pump piston 30. Between the passage 28 and the cylinder bore 24 there is a smaller connecting passage 3| at the bottom of which is a perforated threaded plug 32 adapted to support a spring 33 pressing a ball valve 34 on its seat to tend to keep closed the passage 28 above mentioned.

To the top of the main block 21 is threaded a liquid tank 35 in the form of an inverted cylinder and sealed at its lower end by a suitable packing ring 36 disposed in the block 21. The head of the tank 35 is provided with a small bore through which slides the upper end of stem 31 of the pump piston 30, and this is suitably packed as at 38. The upper end of the stem 31 is provided with a cross pin 39 riding in a slot 40 in a lever or link 4| pivoted at 42 between upright spaced arms 43 formed on the upper end or head of the tank. The lower end of the pump piston 3l) has a longitudinal passage 44 with a lateral branch 45 always exposed to the interior of the tank which contains the pressure fluid 46 of the pump. The lower end of this passage 44 is enlarged as at 41 and is closed by a threaded perforated plug 48 in which is supported a spring 49 pressing a ball valve 50 against its seat normally tending to close the passage 44.

At the lower left end of the link 4| there is supported on a pin an operating handle 52 having a long slot 53 at its upper end in which pin 5| is disposed. The lower portion of the link also has a slot 54 into which the handle can be moved when it is swung upward from the loose dependent position shown in the drawing. 'I'his movement of the handle and its projection into the slot 54 will then make the handle temporarily an integral extension of the link 4| and give the link an extended leverage whereby the piston 30 may be moved up and down with little effort. When the pumping action ceases the handle may be pulled out of the slot 54 and allowed to hang down as shown.

In order to relieve the pressure which may be produced in the cylinder 24 and allow the jack to resume its normal condition, a release valve is provided in the shape of a ball valve 55 held to close a lateral passage 56 from the passage 3| by means of a stem 51 threaded in a lateral bore 58 in the block 21 and operated by a handle 59. Normally of course the valve 55 is held closed. A vertical by-pass passage 60 extends from the bore back of the ball valve 55 to the interior of the tank 35. The valve 55 is a free element and always centers itself securely, not being definitely connected to the stem 51 which holds it closed.

Two air valves are provided in the head of the tank 35 as well as a liquid filling plug 6|. These valves admit atmospheric air when the tank pressure gets too low and let out compressed air during the release of the jack. They are shown in detail in Fig. 2. 'I'he head of the tank 35 is provided with two passages 62 and 63 on opposite sides of the upright arms 43. The top of passage 63 is closed by a perforated plug 64 and within is a spring 65 pressing a ball valve 66 against its seat to close the passage 63. 'I'he passage 62 at its bottom is provided with a perforated plug 61 and 4 above it is a spring 68 pressing a ball valve 69 against its seat to close the passage 62. It is seen that the valve 69 will admit air when the pressure in the tank gets too low and the valve 66 will release air from the tank when the pressure gets too high.

Operation of the device When it is desired to use the jack, it is taken out and placed on the ground with the hook 2| beneath the bumper of a car or other desired portion thereof. 'Ihe handle 52 is lifted from the dependent position shown and slipped into the slot 54 of the link 4| after which, by moving it up and down, the pump piston 3U is reciprocated in the passage 29. Due to the great length of the piston 30 any deflection of its upper end is reduced to a minimum by the pin and slot connection thereat and therefore it gives good compression and conserves the sliding surfaces and packing rings associated therewith. The handle is thus always fastened to the jack, cannot be lost, and will stow away with it in a small compass.

When the piston 30 is raised, the liquid in the tank forces valve 50 to open against the pressure of the spring 49 and liquid enters the passage 41 below this valve. When the piston is forced down this trapped liquid is forced past valve 34 and into the main cylinder chamber against the top of piston I3. Since this piston is firmly planted on the ground through the base l0 the result is that the cylinder pipe I6 and block 21 and connected parts including the hook 2| are forced upwardly. This action will continue until the hook has raised the portion of the car the desired distance.

As the liquid in the tank is forced down into the cylinder 24 and raises the hook, the air pressure above the liquid in the tank will be reduced. If it decreases below a desired amount, air will be admitted through valve 69. Thus, derangement of the inlet action is avoided by preventing the formation of a Vacuum above the liquid in the tank.

When the jack is to be released to lower the car and the lifted wheel thereof, the handle 59 is turned to release the pressure of stem 51 on the free ball valve 55 which thus allows liquid in the cylinder 24 to by-pass through passages 56 and 60 into the tank. This release of pressure will allow the block 21 and pipe I6 to move down and the hook 2| will then drop below the engaged part and the jack can be removed.

In discussing the several advantages of this construction of jack it is to be noted as follows:

1. The block or main body of the jack contains within itself the three valves 34, 5|! and 55, and the pumping cylinder 24, thereby eliminating all danger of leakage.

2. The pumping piston 30 has a practically straight line motion thus avoiding deflection and consequent wear on it and packing elements. tl'landle is always attached in one or other posiion.

3. The tank functions also as a support and bracket for the operating handle.

4. The release Valve 55 is a free self-centering element and thus insures a tight closing of the valve at all times when it is pressed into place. Releasing action independent of other valves.

5. The lifting hook prevents slipping of engaged part, and results in less pressure on pipe I6 with same lifted weight.

6. Over and under air pressure above liquid is avoided by valves 66 and 69.

7. The form of the base allows inclination of the jack With respect thereto without sliding. Jack cannot be separated from base.

8. All parts amply sealed to prevent leakage.

9. The axis of the main and pumping cylinders and associated pistons are aligned and transmit the reaction forces through the single line to the concave spherical surface of the base at the center thereof. This affords maximum application of force through the jack without any undue lateral stresses and strains thereon.

While the invention has been described in detail and with respect to a present preferred form which it may assume it is not to be limited to such details and form since many changes and Number modifications may be made in the invention without departing from the spirit and scope of the invention in its broadest aspects. Hence it is desired to cover any and all forms and modications of the invention which may come within the language or scope of the appended claim.

What I claim as my invention, is:

In a lifting jack having an operating piston, and a liquid tank within which the piston is disposed, a construction comprising a link pivoted to said tank and connected to one end of the piston, a pin on the end of the link, a handle having a slot in which said pin rides, the sides of the handle where the slot is located having smooth unbroken surfaces, whereby the handle may depend parallel to the tank when 6 not in use, the end of the link having a longitudinal slot opening into the end thereof, whereby the handle may be swung into longitudinal alignment with the link and moved to project its end 5 into the slot in the link, whereby the handle and the link form a continuous straight line a element for the operation of the piston.

JULIUS A. BELINKIN.

REFERENCES CITED The `following references are of record in the le of this patent:

UNITED STATES PATENTS Name Date 395,675 Weeks Jan. 1, 1889 532,265 Cornell Jan. 8, 1895 691,670 Shipley Jan. 21, 1902 789,000 Bushyeager May 2, 1905 833,457 Hammond Oct. 16, 1906 952,051 Sowash Mar. 15, 1910 974,988 Northam Nov. 8, 1910 1,059,884 Link Apr. 22, 1913 1,292,498 Malone Jan. 28, 1919 1,467,157 Hayden Sept. 4, 1923 1,697,234 Foyle Jan. 1, 1929 1,793,462 Bolens Feb. 24,l 1931 1,828,252 Lynch Oct. 20, 1931 2,146,403 Nilson Feb. 7, 1939 2,261,438 Harwood Nov. 4, 1941 2.359-060 Strom Sept. 26, 1944

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