US1404455A

US1404455A - Lifting jack

Info

Publication number: US1404455A
Application number: US342665A
Authority: US
Inventors: Aaron L Mann
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-12-05
Filing date: 1919-12-05
Publication date: 1922-01-24
Anticipated expiration: 1939-01-24

Description

A. .L. MANN.

LIFTING JACK.

APPLICATION FILED DEC-5,1919.

1 ,4;()4,455 Patented Jan. 24, 1922.

3 SHEETS-SHEET l- L. MANN.

UFTING JACK.

APPLICATION FILED DEC-5,1919.

5 4* m 1 1 m A nu 43F... #65? a 4 Z 32 a:

A. L. MA-NN. LIF'I ING JACK.

APPLICATION FILED DEC- 5, 1919- 1304355, Patented Jan. 24,1922.

3 $HEETSSHEET 3.

UNITED STATES PATENT OFFICE.

LIFTING JACK.

Specification of Letters Patent.

Patented Jan. 24, 1922.

Application filed December 5, 1919. Serial No. 342,665.

in the provision .of a lifting jack that is strong and durable in construction, which is capable of use with various vehicles irrespective of the difference between their axle and the ground, and which may be collapsed into avery small compass when not in use for convenience in transportation.

A further object of the invention is to produce a device of the above character 7 which is collapsible in structure, easy to assemble for use when desired, and which when assembledwill be braced in a rigid position,.thus assuring the proper operation of a the device.

I Figure 3, is a vertical sectional view on line 33 of Figure 1;

Figure 4, is a perspective view of the shoe used in connection with my invention;

'Figure 5, is a perspective view of the base plate;

Figure 6, is a side view showing the relative position of the parts when collapsed:

Figure 7, is a perspective view of the lifting lever; Fgure 8, is a perspective view of the parts in detail used in connection with the lifting lever; and

Figure 9, is a detailed perspective view of one of the bearing blocks.

In the drawings, wherein for the purpose of illustration I have shown a preferred embodiment of my invention, the numeral 5 designates the base member which is preferably formed from ,a flat piece of metal with a reduced portion 6 at one of its ends. l-irranged centrally of the reduced portion and extending longitudinally for its entire length are a pair of spaced upwardly extending flanges 7 between which are formed a plurality of notches 8 the purpose of which will be set forth later. The main portion of the base member 5 is provided with transversely extending ribs 9 and 10 at each end. Rigidly attached to the rib 9 is a substantially U shaped bearing 11 which supports the upright standard 12 pivotally secured thereto through the medium of the transversely extending bolt 13. This standard is of a rectangular configuration and is slotted longitudinally through its face for approximately its entire length, as clearly shown in Figure 3. The two outer faces of the side pieces of the standard 12 are provided with a plurality of ratchet teeth 15. The rib 10 rigidly supports at each of its ends a bearing block 16 which is more clearly illustrated in Figure 9. The outer side of the bearing blocks are arcuate in shape and recessed as at 17. A. vertically extending bar 18 is mounted between the bearingblocks 16 being pivotally connected thereto by the pivot pin 19, the ends of which'are disposed within the recess portions 17 of the bearing blocks. The bar 18 is of the same length as the standard 12 and has its inner face also provided with ratchet teeth 20. The lower edge of the standard 12 is beveled as at 21 which limits the rearward movement of this member. Pivotally connected to one side of the bar 18 is the brace lever 22 which extends between the bar and the standard having its free end disposed in the recess 23 formed, in one edge of the standard. This lever holds the'members in spaced relation, as clearly shown in Figure 1. In order that the bar 18 may be supported in a vertical position, a support 24 is pivotally connected to the bar approximately intermediate its length, ,as at 25. The lower end of the support 24 is beveled as at 26, and is adapted to engage the notches 8 which regulate the adjustment of the lever 18.

The lifting lever 27 passes through the slot 14 in the standard 12 within close proximity to the ratchet teeth 20 of the bar 18. The outer end of the lever 27 is slightly ofl'set as at 28, to form the handle 29. The portion of the lever which is disposed be- I tween the standard 12 and the bar 18 is enlarged, as at 30 with each of its sides provided with an upwardly tapering groove or recess 31. The lower front portion of the enlargement 30 is slotted as at 32, to receive the spring actuated-pawl or lug 33. This lug is or" a substantial rectangular shape having at one end two outwardly-turned projections 34. The central portion of the pawl is grooved as at-35, to receive the coil spring 36 which normally holds the pawl in an extended position and in engagement with the ratchet teeth of the bar 18. A hook 37 of a substantial Y shape has its upper ends 38 bent inwardly and pivotally connected to the enlargement 30 above the slot 32. The sides of the hooks extend, downwardly past .the pawls 33 and engage the eyelet 39 to which is loosely attached a longitudinally extending rod 40 which passes beneath the lifting lever 27 and through the slot 14 to a position directly beneath the oilset portion 28 of the lever 27. In order that the rod 40 will be supported in a substantial horizontal position, a bearing 41 is formed fromoa-piece of Wire coiled intermediate its length as at 42, and extending upwardly so that its ends 43 may be joined to the lever 27. The outer end of the rod 40 is looped providingaa finger engaging loop 40.

Disposed longitudinally beneath the center of the liftinglever 27 is a U shaped bracket 44 which is fixedly secured thereto by bolts or other suitable means. This bracket is so positionedthat the transversely extending opening left by the bracket will be on a plane with the outer or ratchet surface of the upwardly extending standard 12. Slidably mounted in this opening is a pawl 45 having a centrally projecting portion 46 which is disposed within the slot 14 of thestandard 12 to regulate the lateral movement of the pawl. The opposite side of the pawl is recessed at its center to receive the coil spring 47 which normally holds said pawl in engagement with the ratchet teeth 15 of the standard 12. This pawl is actuated by the lever 48 which is bent intermediate its length extending along the side of the lever 27 until its ends engage the openings 49 at each side of the pawl 45.

A shoe 50 of arcuate shape is adapted to engage'beneath the axle of the vehiclepreparatory to the operation of the jack. This shoe: isf provided with a downwardly extending shank 51' which is slotted for approx mately its entire length to receive that port1onofthe enlargement 30 which separates the grooves or'recesses 31.1 Each side of-the shank 51 is provided with spaced key hole openings 52 that are in alinement with each'otherand adapted to receive the key the lower end of which engages the notches 8 formed in the extension 6 of the base memher 5. The enlarged portion 30 ofthe lift-f ing lever is then passed through the vertically extending slot 14 in the standard 12 so that the pawl 33 is normally in engagement with the ratchet teeth 20 of thebar 18. When in :this position the pawl 45 will be in engagement with theratchet teeth 15 of the standard 12. shoe 50 is then slipped over the portion of the enlargement which separates the grooves 31 and is adjusted in its desired position by the key 53. When in thisposition theijack is ready for. use.j However, in assembling the device it is necessary to place the jack beneath the axle of the" vehicle before the bar 18 is raised into position. The shoe 51 is then placed directly beneath the axle and The shank 51 of the" by applying pressure to the handle 29 the pawl 33 will be moved upwardly'a notch,

the pawl 45 acting as a fulcrum in this movement. The handle 29 is then pulled upwardly, during which movement the pawl 45 will be moved two notches. This movement is continued until the axle ofthevehicle has been raised sufiiciently for thevpurpose desired. To release the jack the levers 40 and 48 are alternatelypulled outwardly so as to disengage the paw-ls fromthe, ratchet teeth, thus lowering the jack slowly. When not in use, the device may be collapsed into a very small compass soasto be conveniently carried from place to-place.

It is to be understood'that'the form of my invention herewith shown and described, is to be taken as a preferred example of the same, and that certain changes in the-shape, size, and arrangement'rof parts maybe resorted to without departing. from the spirit of the invention or the scope oi the subgrooves, and means carried by the shank for adjusting the shoe.

2. A lifting jack comprising a base member, an upright standard pivotally connected to the base and slotted longitudinally, a ratchet bar pivoted to the base in spaced relation to said standard, a lever passing through the slotted standard having an enlarged end in close relation to said bar, a. spring actuated pawl mounted within a slot in the end of the lever engageable with the ratchet bar, a second pawl mounted upon the lever approximately midway its length, said pawl a apted to engage ratchet teeth formed upon the sides of the standard, and rods for controlling the actuation of the pawls.

3. A lifting jack comprising a base member, a slotted standard pivotally connected thereto, a bar spaced from said standard in alignment with the slot, a lever extending through the slot in the standard, said lever having an enlarged end between the standard and bar, ratchet teeth formed on the said standard and bar, pawls slidably mounted upon the lever engageable with the ratchet teeth, rods for actuating the pawls, grooves on the sides of the enlarged end of the lever, a shoe having a bifurcated shank fitting the said grooves, and means permitting vertical adjustment of the shank with respect to the lever.

In testimony whereof, I have affixed my signature in the presence of two witnesses.

AARON L. MANN. Witnesses:

ALBERT F. KING, ORVEL RAY MANN.