US2456105A

US2456105A - Hydraulic jack

Info

Publication number: US2456105A
Application number: US698522A
Authority: US
Inventors: Berg Louis
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-09-21
Filing date: 1946-09-21
Publication date: 1948-12-14
Anticipated expiration: 1965-12-14

Description

Patented Dec. 14, 1948 y UNITED .STATES PATENT OFF'E CE HYDRAULIC JACK .Louis Y Berg, Birmingham, .Mieh.

Application SeptemberZ'l, 1946, Serial No. .698,522

(Cl. 254-f93) .2 Claims.

' This invention relates to improvements in hydraulic jacks and in 'particular to improved hydraulic bumper jacks for automobiles. y

The 'primary `object of the vinvention is toprovide/an improved hydraulic jackin which the entire hydraulic pumping and valve mechanism is located in a novel, compact-and readily manufacturedzhead.

Another object of theinvention is to provide an improved hydraulic `bumper jack in which the .bumper engaging means is readily adjustable to the bumper prior to the jack being operated Ito lif-tfan automobile. A further object of the invention is to `provide yan improved .hydraulic bumper jack which is simple .in construction,.ipositive :in operation and inexpensiveito manufacture.

Other :objects `of the invention will vbecome apparent Vby reference to the following detailed description taken vin connection with the Vaccompanying drawing, in which:

Fig. 1 is a side elevational View V`of .a r.hydraulic bump-er jack embodying `the invention with portions thereof br-oken away to illustrate the construction.

Fig. 2 is a horizontal sectional view taken on'the yline 2--2 of Fig. 1.

Fig. 3 is a horizontal sectional view taken on the line 3--3 of Fig. 1.

Fig. 4 is -a fragmentary sectional view taken on 'the'lline4-4 of Fig. 2.

Referring now to the drawing wherein vlike nu merals refer to like and `corresponding parts `throughout the several views, the particular rem 'bodiment of the inventiondisclosed for the purpose of illustration comprises a base I0, `a general- "ly vertically disposed piston II having a ball l2 formed on the lower vend thereof engaged in a socket L formed in the said base Ill, a cylinder I4 `into which the 'piston I I is reciprocatingly mounted, a housing I5 forming a reservoir I6 for oil or ymentof the said cylinder .I4 with respect -to the piston I Land a manu-ally operated lowering valve -2llconnecting the reservoir I6 with .the upper end 'of-the said cylinder I4 for lowering thesaidhousing I5 under load, an -adjustable bum-perengaging arm 21 slidably mounted on said housing I5, fand l a cam 22 for releasa'bly securing the said slidable.v

on the. said housing 15.

, The top ci the -verticallydisposed piston -I'I has a fself sealing :head E3 .of neoprene, leatherror the like :secured .on the upper `end .thereof which is suitably lipped to flex against the Wall .of the cylinder 'I4 `and provide a seal between ythe top ofthe piston l! andthe vcylinder 'I4 'when fluid under pressure `'is 'forced from the pump Ehead :il into the cylinder I4. The said piston head 23 `has washers '24 and 25 disposed aboveand below the base thereof and is .secured to 'the .top vof fthe piston `Il .by means of a stud 26. The bottom 4of the cylinder I4 and `the bottom of the housing I5 :are xed in sealed relationship to a guide sleeve 21.7 disposed around the piston Inl. `Packing 28 squeezed between thelower Vendofithe cylinder It and a packing .nut 129 slidably disposed over=the .piston II andthreaded into .the guide sleeve "2l prevents 'leakage of iluld from the lower end of the said cylinder I4 as it ymoves upwardly :and :downwardly vwith respect to the piston -I I. The upper `end of the Icylinder vI4 is threadedzat Sil into a Cylindrical recess provided in .the'bottom of the `pump head Il and the .housing I5 is pressed, lbrazed orfotherwise secured at'SI to -therlowerend ofthe said `pump head il, all as best shownin Fig. l.

The bumper-.engaging arm generally designated bythe numeral El in Fig. 1 comprises a-sleeve 32 `slidably disposed on the housing I 5 with a pair of laterally spaced later-ally protruding vheolcs .33

'adapted -to engage -a bumper of an automobile formed integral with the said sleeve 32 4and extending laterally therefrom. A -pin 34 extends through .both ofthe said spaced protruding hooks v33 near the housing I5 and has journaled .thereon an eccentric or cam 22 having an operating lever ,55 xed..thereto. By moving the operating lever ..35 from Athe full line position shown in Fig. 1 to the dot and dash line position 350, the cam 22 isbroiiglit into engagement with Ithe'housing I5 andthe 'bumper engaging arm 2i becomes reizcovaloly `ixed with respect thereto.

,The pumphead Il comprises a cylindricallower portion 35 and a pair of laterally spaced .rec-

tangular upright members .3l integral vtherewith connected at their l.top by a `bridge 38. Each upright member y5l is vertically bored from the .top thereof and lined with tubular liners 35 to form cylinders 483 -and 4I which are iitted with

pistons

42 and 43. The upper end oi each piston is ilattened at 44 to accommodate links Il5 which are connected by link pins 45 and il to the pistons 42 Iand l43- andthe .rocker rarm i8 respectively. The .said rocker arm 48 is pivoted on a transverse viul- .cr.um..pin49 which extends through the rocker arm 48 and the bifurcated fulcrum support 50. The end 480 of the rocker arm 48 which is broken away in Fig. 1 extends outwardly a suiiicient distance to serve as a lever for pivoting the said rocker arm 48 about its fulcrum 49, thus causing the

pistons

42 and 43 to reciprocate in the cylinders 49 and 4I respectively.

A suitable annular gasket or ypacking 5| of neoprene or the like is positioned around each

piston

42 and 43 and is squeezed between the upper ends of the liners 39 and a packing nut 5|0 threaded in the upper end of each cylinder 40 and 4l to provide a leakproof joint around the said

pistons

42 and 43. Each

piston

42 and 43 is preferably shouldered at its lower end 52 and has a central depending button 53 formed on the lower end thereof over which is disposed a cup shaped self sealing piston head 54 of neoprene, leather or the like which is suitably lipped to flex against the walls of the cylinders 49 and 4| to provide a seal between the top of the

pistons

42 and 43 and the said cylinders 49 and 4I respectively during the compression stroke of the

said pistons

42 and 43.

Each of the cylinders 40 and 4I is provided with a vertically disposed

inlet port

56 and 57 respectively which are `connected by a transverse inlet passage 55 to a vertical inlet passage 560 which in turn is connected to the eduction tube I8 which extends to a point near the bottom of the reservoir I6 located between the cylinder I4 and the housing I5. Normally closed spring loaded

ball check valves

58 and 59 are disposed in the transverse inlet passage 55 between the vertical inlet passage 569 and the

vertical inlet ports

56 and 51 of the cylinders 40 and 4I respectively, all as best shown in Figs. 1, 2, 3 and 4.

Each of the cylinders 40 and 4| is also provided with vertically disposed outlet ports 60 and 6| respectively which are connected by

transverse outlet passages

62 and 63 to

vertical outlet passages

64 and 65 normally closed by spring loaded ball check valves 65 and 6'! which are urged closed by a common inverted cone spring 68 disposed between the head of a stud 69 and a rocker washer I0 which maintains either one or both of the said ball check valves 65 and Bl closed at all times, all as best shown in Figs. 1, 2 and 3.

After the jack has lifted an automobile by its bumper or other object to the desired height, the hydraulic jack is lowered by turning the lowering valve Sill to the position indicated in Fig. 1 with the passages 'II and 'I2 in communication with each other whereby to let iluid flow from the cyl inder I4 above the head 23 of the piston to the reservoir E6. Obviously, during pumping to raise the jack, the lowering valve 20 is closed by turning the same 90 degrees from its position shown in Fig. l.

From the foregoing detailed description, the operation of the hydraulic bumper jack is obvious, the improved construction being simple and inexpensive to manufacture and requires substantially no maintenance.

Although but one embodiment of the invention has been disclosed and described in detail, it is obvious that many changes may be made in the size, shape, arrangement and detail of the various elements of the invention without departing from the spirit and Scope thereof as defined by the appended claims.

claim:

l. A hydraulic jack comprising a base, a piston connected to said base extending upwardly therefrom, a piston head on said piston, a cylinder substantially coextensive of said piston reciprocatingly mounted over said piston, a housing over said cylinder, a pump head on said housing and said cylinder forming a reservoir around said cylinder including an eduction tube extending into the said reservoir to a point substantially at the bottom' thereof, a multi-piston pump in said pump head including intake and outlet valves for each pump cylinder between the said reservoir and the said jack cylinder `respectively employed to withdraw i'luid from said reservoir and force the same into said cylinder above said piston head whereby to raise the said cylinder and housing on said piston with respect to the said base, an independent spring urging each intake valve closed, a rocker washer bridged between the said outlet valves and a common spring acting through said rocker washer urging said outlet valves closed and permitting either one or the other to open, means slidably adjustable along said housing adapted to be removably fixed to the desired position therealong for engaging objects of various heights, and a manually operated lowering valve normally closed which when open permits uid to flow from said cylinder to said reser- Voir responsive to weight lifted by said jack.

2. A hydraulic jack comprising a base, a piston connected to said base extending upwardly therefrom, a piston head on said piston, a cylinder substantially coextensive of said piston reciprocatingly mounted over said piston, a housing over said cylinder, a pump head on said housing and said cylinder forming a reservoir around said cylinder including an eduction tube extending into the said reservoir to a point substantially at the bottom thereof, a multi-piston pump in said pump head including intake and outlet valves for each pump cylinder between the said reservoir and the said jack cylinder respectively employed to lwithdraw iluid from said reservoir and force the same into said cylinder above said piston head whereby to raise the said cylinder and housing on said piston with respect to the said base, an independent spring urging each intake valve closed, a rocker washer bridged between the said outlet valves and a common spring acting through said rocker washer urging said outlet valves closed and permitting either one or the other to open, the said cylinder having a by-pass therethrough near the bottom thereof whereby to cause fluid to circulate from said cylinder to said reservoir after the said cylinder and housing have been raised to a predetermined height, means slidably adjustable along said housing adapted to be removably xed to the desired position therealong for engaging objects of various heights, and a manually operated lowering valve normally closed which when open permits iluid to flow from said cylinder to said reservoir responsive to weight lifted by said jack.

LOUIS BERG.

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

UNITED STATES PATENTS Number Name Date 1,925,704 Pfauser Sept. 5, 1933 2,164,621 Pfauser July 4, 1939 2,170,464 Rosenberry Aug. 22, 1939 2,195,045 Bernay Mar. 26, 1940 2,261,438 Harwood Nov. 4, 1941 2,351,145 Pearson June 13, 1944