US1435128A - Jack - Google Patents

Description

- JACK. APPLICATION FILED MAR. 2B, 192|.

Patented Non?, 11922.

Patented Nov. 7, R922.

entre stares PATENT @FFHCE HARRY C. NEWMAN, 0F LOS ANGELES, CALIFORNIA, ASSIGNOR 0F 0L' E-THIRD T0 H. D.

EBERLE AND ONEeTHIRD TO SPENCER C. ROGERS, BOTH 0F LOS ANGELES, GALI- FORNIA.

JACK.

Application mea March 28,1921.

To all rwhom t may concern.'

Be it known that I, HARRY C. NEWMAN, `a citizen of the United States residing at Los Angeles, in the county of lios Angeles and State of California, have invented a new and useful Improvement in Jacks, of which the following is a specification.

y invention relates to jacks and is particularly applicable to jacks which may be placed under automobiles or trucks to raise same'and tlus permit replacement and repairof tires. l Such jacks must ordinarily be so constructed that they are suiiiciently short when in their telescoped position to go under the lowest axle to which it may be desired to apply them, and, atthe same time, they must have sufficient length of travel to reach and lift high axles far enough to allow the A tires to be removed and replaced.

It is common practice in many forms of jacks to provide means for obtaining an initial adjustment to suit the 'axle previous to the actual lifting operation. That is, the jack is put under the axle and adjusted to suit the height of the axle.

An object of my invention is to provide a jack`which is sufliciently short to go under lany automobile or truck axle to which it may needto be applied, and which will automatically and instantly adjust itself to theV height of the axle upon starting of operations.

Further objects and advantages `will ben made evident hereinafter. y

Referring to the drawing which is for illustrative purposes only,

Fig. 1 is a side elevation of my invention. Fig. 2 is a section on a plane represented by the line 2,-2 of Fig. 3.

Fig. 3 is a section on aplane represented by the line 3 3 of Fig. 1.-

Fig. 4 is a section through the lower portion of the device on. a plane represented by the line 4-4 of Fig. 3.

n the form of the invention illustrated, a base 11 is provided in which is secured in fluid tight relationship an outer tube 12 and an inner tube 13, the tops of these tubes being connected together by a cap 14. The space between the tubes 12 and v13 forms an oil reservoir. Sliding in liquid tight contact Serial No. 456,458.

with the inner wall of the tube 13 isa lift bar or plunger 20, this plunger passing through a Stuffing box 21 in the cap 14. Sliding in a cavity in the center of the lift bar 20 is a ratchet bar 22. The ratchet bar 22 has a central cavity 23 in which a compression spring 24 is placed, the top of the cavity being closed by a threaded e'nd 25 on a saddle 26. The spring 24 tends to force the ratchet bar 22 upwardly out of the cavity in the lift bar 20. Pivoted on a pin A27 carried by the lift bar 20 isF a pawl 28 of proper shape to engage ratchet teeth 29 formed in the ratchet bar 22.

`A cup leather may be used to assist in makplunger 36 belng connected to a piston rod 3.7 which is pivoted on a pin 38 in a lever 39. The lever 39 is fulcrumed on a p-in 40 carried by a link 41 pivoted on a pin 42 carried in the base 11. A detachable handle 43 is provided for thelever 39. The space 45 inside the tube35 below the plunger 36 communicates with a passa e 46 which is connected through a valve 4g withl the space'w 15 and through a valve 48 with the space 32. The valve 47 is provided with a spring holding it normally closed, the valve 48 working by gravity. The valve 47 ishso constructed that oil may flow from the space 15 into the passage 46 but not in the opposite direction and the valve 48 is soconstructed that oil may flow from the passage 46 into the space 32 but not in the opposite direction. The pawl 28 is provided with a tail 50 and with a position against the upward thrust of the 4spring 24. f

With the parts inthis position, i. e? in the position shown in full lines in Fig. 2, the jack has a minimum hei ht and may be slipped under very low ax es. Whenever it is desired to raise an axle or other load,the valve 31 is closed and the plunger 36 is reciprocated by moving the handle 43 up and down. At each upward stroke of the handle, oil is drawn through the valve 47 from the `Ieservoir 15 into the space 45. On the down stroke, this same oil is forced from the space 45v through the valve 48 into the space 32, thus forcln'gf'the lift bar 2O upwardly and at the same time raising the saddle 26 and the ratchet bar 22. As soon', however, as the lift bar 20 has moved upwardly a short distance, the tail 50 of the pawl 28 leaves the cap 14 and the pawl 28 is forced in a clockwise direction around the pin 27 due to the upward thrust of thespring 24. This releases the pawl 28 from the top of the teeth 29 and the spring 24 acts freely, forcing the saddle 26 upwardly until it either is extended to its 4full length or until it meets obstruction.

In practice, the jack is telescoped to its full degree as shown in full lines in Fig. 2,

and is placed on the ground and moved to a position directly below the axle. A few strokes of the handle 43 forces the plunger a 20 far enough up to release the pawl 28 and the saddle 26 shoots upwardly under the action of the sprin 24 until it seats underneath the axle. I now the handle 43 is operated further, thelift bar 20 rises and the4 pawl 28-is forced into engagement with the under side of one of the teeth 29 by the spring 51. A further operation of the handle 43 causes the lift bar. 20 to raise the ratchet bar 22 by meanspof the pawl J28.

It will, thereforez be seen that in practice the jack may be carried in its collapsed sition as shownin Fig. 2',` the spring 24 being restrained by the tail of the'pawl 28 res ingon the top of the cap 14. ,i 4 It willV be further seen that as soon' as the jack is used, it automatically adjusts itself to the hei ht of i the load which it is desired to lift wlthout the necessity of the operator taking `any pains w1th its adjustment. This is aver f be placed under an automobile a considerable distance and their manipulation in this lallowing free communication between the 'downwardly until' the parts assume the space 32 and the space 15.V With the valve 31 open, itis possi le to push the saddle 2.6 pos1- tion indicated in full lines in Fig. 2. A

check valve 100 is. provided in the cap I4 of oil therefrom.

I claim as my invention:

1. In a jack, ther `combination of a liftbar; means for forcing said lift bar upwardly; vra ratchet bar sliding vertically in said lift bar; elastic means for forcing said ratchet'bar upwardly in said lift bar; and locking means for preventing said ratchet bar from being forced downwardly in said lift bar. i 1

2. In a jack, the combination ofl a lift bar; means for lforcing said lift barV upwardly; a ratchet bar sliding vertically in said lift bar; elastic means for forcing said ratchet bar upwardly in said lift bar; and a pawl pivoted to said lift bar and engaging .teeth ,formed `on said ratchet bar in such a which is so arranged to prevent the escape 3. In ajack, the com ination of a lift bar;

means for forcing said lift bar upwardly; a ratchet bar sliding vertically in said lift bar; a compression spring betweensaid lift bar and said ratchet bar so disposed as to force said ratchet bar upwardly in'said lift bar; and lockingmeans for preventing .said ratchet bar from being .forced downwardly in said lift bar.

4; In ajack, thecombination of a lift bar; means for forcing saidlift bar upwardly; a ratchet bar sliding vertically 1n 4said hft bar; a compression spring between saidlift bar and said ratchet bar so disp posed as to force said ratchet bar u wardly in said lift bar; and a pawl pivote A to said lift bar and engaging teeth formed on said ratchet bar in 'such a manner asl to prevent said ratchet bar from being forced .downwardly'in said engaged. Y

5. n a jack,`the combination of a supportingstructure.; a lift bar sliding vertical fyt 1n said structure gmeans, for torcing said l1 bar to move'. u wards in sald structure; a

lift bar, when.said pawl'lis ratchet bar sli 'ng vertically; sprmg means for forcing said ratchet bar to move u pwards; and ratchet means whereby sald lift .i .bar raises said ratchet bar. lmportant feature as Jacks must ordinarily; i

6. In a jackthe combination of -a ratchet bar; elastic means for forcing that bar up'- wards until it strikes the loa to be lifted; and power multiplying means thereafter causing said bar to lift said load.

7. In ,a jack, the combination of'a ratchet bar; elastic means for forcing that bar up wards until it strikes the loadto be lifted;

ratchet teeth formed on said ratchet'bar;

and powermultiplying means acting on said teeth load.

8. In a ack, the combination of a ratchet to raise said .ratchet bar and said bar elas'ticmeans for forcing that bar up. f

wards until it strikes the load to be lifted; ratchet teeth formed on said ratchet bar; a awl engaging said teeth to lift said ratchet Ear and said load; and power multiplying means for forcing said pawl upwards.

9. Ina jack, the combination of a ratchet bar; elastic means for forcing that bar u`pwards until it strikes the load to be lifted; ratchet teeth formed on said ratchet bar; a pawl engaging said teeth to lift said ratchet bar and said load; a lift bar on which said' pawl is pivoted; and power multiplying means for forcing said lift bar upwards.

10. In a jack, the combination of a'ratchet bar; elastic means for forcing that bar upwards until it strikes the load to be lifted;

means for initially preventing said upward movement of said bar; and power multiplying means thereafter causing said bar to lift said load.

11. In a jack, the combination of a ratchet bar; elastic means for forcing that bar upwards until it strikes the load to be lifted; means for initially preventing said upward movement of said bar; ratchet teeth formed on said ratchet bar; and power multiplying means acting on said teeth to raise said `ratchet bar and said load.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 22nd day of March, 1921.

HARRY C. NEWMAN.

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