US1609886A - Jack - Google Patents

Description

Dec. 7 192s. 1,609,886

C. W. RIPSCH JACK F/CLE FIG] INVENTOR. CHARLES W. RIPSCH A TTORNEYS.

JACK

Filed June 2 mm: III

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c. w. RIPSCH Y 2 Sheets-Sheet 2 CHARLES w. R/PS ATTORNEYS.

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Patented Dec. 7, 1926.

' U ITED AT S CHARLES W. BIPSCH, OE DAYTQN, OHIO.

JACK.

Application filed June 29, 1923 Serial No. 648,302.

My invention relates to jacks.

It is the object of my invention to provide a jack which may be readily elevated or depressed by the positive action of the operating handle.

It is an additional object to providea jack which will descend when unlocked under the weight of the load which it is supporting.

It is a further object to provide a jack in which this descent may be controlled by a brake.

It is a further object to provide means of locking the jack at any point in its descent, and also means forunlocking it,

It is a further object to provide this combination of parts at the bottom of the jack inorder to lower the center of-gravity and make the jack more convenient for operation with less interference tothe operating han dle of the jack when the jack is under load.

It is a further object of my invention to provide a jack in which the several parts are always in engagement with one another and which eliminates any clutch or like mechanism for the engagement of the parts one with the other.

It is an additional. object to provide a common casing for all of the jack parts, including the brake and the lock, so that all the parts will be lubricated from the lubricant in a single casing.

It is a further'object of my invention to provide a jack in which the several parts may be readily reached without removing all of the parts in the jack.

It is my object to provide a jack which is simple, has the minimum of parts, and is very strong, and in which the rate of descent is always Within the control of. the

operator through a slight movement of the controlling handle.

It is my object to provide a jack which may be immediately arrested in its movement, so that the fin'estadjustment may be made.

Referring to the drawings:

Figure 1 is an elevation of the jack with the cover plate over the brake mechanism partially in section and partially removed;

Fig. 2 is an elevation of thejack with a quarter section removed on the line 2-2 of Fig. 4'

Fig.' 3 is a section on the line 3- 3 of' Fig.

. Fig. lisa section on the line 1-4: of Fig. Fig. 5 is an end elevation of the brake and lock mechanism with the cover, removed showing the brake ring partially'in section to disclose the method, of mounting helical springs.

Fig. 6 is an elevation of. thejack from the brake and lock side; i

Referring to the drawings in detail:

1 is a base having a plurality of strengthening ribs 2. Upon this base is mounted a grooved plate 3 which. constitutes the lower member of cage fora ballbearing. This ball bearing consists oftheplate 3 andthe upper plate a between which in suitable grooves inv these plates, designated 5 and 6 respectively, are located the balls 7 Jou1' naled' in these plates is the base 8 of the main elevating screw. Fixed tot-his screw in permanent engagement therewith and turning with it is the beveled ear 9 on which are formed the teeth 10. fiesting on the gear and surrounding the stem of the screw is aspacing collar 11 above which is the flight of the screw 12. The top 13 of; the screw is located beneath a cap plate 14 upon which the load to be elevated rests. This plate is formed integral with a sleeve 15 which travels within the main tubular casing 16 within the jack and is guided thereby. The sleeve 15 is provided with a shoulder or ring 17 against which abuts a nut 18 internally threaded at 19. This nut engages with the screw 12.

The gear 9 has a cutaway portion on its under surface in. order to receive a. worm wheel 20 which is pinned thereto by the pins 21. This worm wheel meshes with a worm 22 mounted upon ashaft 23 which is journaled at either. end as at 24 and 25. in the housing, inclosing the mechanism of the jack. On this shaft 23 is mounteda gear 26 meshing with, a pinion 27 on a second shaft 28 journaled in the housing and parallel to the first shaft 23. A cover plate 29 closes the housing and, concealsthe shaft and gears.

The gear 9 is driven by. a beveled pinion 30 having teeth 31 engaging with the teeth 10 of the gear 9. This pinion is mounted on a stub shaft 32 and is journaled in thehousing in a collar 33 in which, there is lo.- cated a'bearing 34. On this-stubfshaft is mounted a ratchet 35 with which engages I a pawl 36. having an 'actuatinghead 37, and

a spring which tends to maintain the pawl in engagement with the teeth of the ratchet 35. This pawl is carried in a casing 39 which is integral with the casing l0 which forms a socket for the reception of a jack handle ll.

Returning to the second shaft 28, it will be observed that this shaft is projected into a supplementary inclosed chamber 42. Within this chamber mounted on the shaft is a brake drum d3. Surrounding the drum and slightly separated from it is the brake ring having a plurality of cutaway cam shaped portions l5 in the periphery thereof. These cam shaped portions are adapted to receive rollers 4.6 which are pressed in one direction by the helical springs 4:7 located in pockets 4:8 in the ring 44.

Projecting in these cam shaped cutaway portions are the unlocking lingers carried on the spider 50, which in turn is mounted upon the operating shaft 51 which projects through the cover plate 52 and is operated by a handle F or the purpose of transporting the jack bodil", rollers are mounted on one side of the base so that when the jack is tipped by a lever inserted in the socket 55, the jack may be wheeled to a new position.

Opem ton.lt will be observed that in the operation of this jack that the ack may be positively moved upwardly or downwardly by the ratchet and pawl and the jack lever. It is customary, however for the jack to descend under the weight of the lead. A it is always in engagement with the braking mechanism, unless restrained the worm, wheels, gears,

' shafts and brake drum will turn, not only these fingers from the when the jack goes up, but when the jack goes down. When the jack goes up there is no tendency of the rollers to lock or to brake the ascent but when the ack starts to descend he rollers will engage with the brake drum and the surface, and thereby effect a braking and ultimately a lockinn of the parts to one another. The helical i ring impels each roller to locking positron.

In order to effect the unlocking of these rollers, the fingers l9 are moved by rotating the spioer 50 to dislodge the rollers from their locking position. Upon the release of rollers they are returned to the braking or looking position when the jack is descending.

'lhe spider is impelled to its inoperative position by the spring 56.

This spider is controlled by the shaft 51 and the hand-lever 53, which is closely adacent to the hand of the operator.

It is thus possible to effect a perfect adjustment of the descent of the jack.

This brake and lock will catch at any point, will immediately talre hold with the exact extent of the braking minimum of lost motion, and the strain of stopping will be put directly on the screw. By varying the extent of the frictional. engagement of the rollers and by varying the position of the fingers on the spider, the action may be. regulated.

In this jacli; it possible to handle economically the lighter tonnages in the neigh borhood of fifteen tons, and also it is possible to handle the heavier tonnages of seventy live to one hundred tons.

By this arrangement the elevating is cured through the gearing which gives a relatively high rate of elevation while the descent is regulated at aslower rate through the worm wheel and worm and the braking and locking mechanism.

1 do not desire to confine myself to the particular details as hereinbefore described, but comprehend within my invention a suitable modification thereof for its practice.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a jack, a vertically extending elevating member, means to operate said elevating member, a worm wheel mounted on said elevating member and turning therewith in either direction, a supplementary shaft mounted in a plane adjacent the lower end of said elevating member, a worm carried by said shaft and adapted to be engaged by said worm wheel, means for braking the descent of said elevating member, and means operated by said supplementary shaft for actuating said said breaking means.

2. In a jack, a vertically extending elevating member, means to operate said elevating member, worm wheel mounted on said elevating member and turning therewith in either direction, a supplementary shaft mounted in a plane adjacent the lower end of said elevating member, a worm carried by said shaft and adapted to be engaged by said worm wheel, means for braking and automatically stopping the descent of said elevating member, and means operated said supplementary shaft for actuating said breaking and stopping means.

3. In a jack, a vertically extending elevating member, means to operate said elevating member, a worm wheel mounted on said elevating member and turning therewith in either direction, a supplementary shaft mounted a plane adjacent the lower end of said. elevating member, a worm carried by said shaft and adapted to be engaged by d worm wheel. means for braking and automatically stoppin the-descent of said elevating member, means operated bysaid supplementary shaft for actuating said braking and stopping means and means for controlling said braking and stopping means. i

4. In a jack, an elevating and lowering til means, gearing for actuating saidlowering and elevating means, a worm wheel connected to saidelevating means near the bottom thereof, a supplementary shaft mounted below the shaftby which said operating gearing is driven, a worm on said supple men tary shaft meshingwith said worm wheel; said worm and worm wheel being capable of turning in either direction with the elevating and lowering means, and means connected with said supplementary shaft tend-- ing to iocl: said jack from descent, and means to control the extent of said locking, whereby the jack may descend freely, be controlled in its descent. or be entirely locked.

5. In a jack, an elevating and lowering means, a main shaft, gearing driven by said shaft for actuating said lowering and elevating means, a worm wheel connected to said elevating means near the bottom thereof, a supplementary shaft located below said main shaft, a worm on said supplementary shaft meshing with said worm wheel, said worm and worm wheel being capable of turning in either direction with the elevating and lowering means, and means connected with said supplementary shaft tending to lock said jack from descent, and means to control the extent of said locking, whereby the ack may descend freely, be controlled in its descent, or be entirely locked, all of said parts being inclosed in a single casing.

6. In a jack, an elevating screw and nut, a stationary casing mounted on the base of the jack, a sleeve actuated by said screw and travelling in said casing, a bearing for sup porting said screw, gearing carried by said screw, actuating gearing for engaging the first mentioned gearing, a ratchet and pawl connected with said actuating gearing, a supplementary shaft located transversely to said elevating screw, a worm mounted thereon, said shaft being journaled in the casing, a worm wheel connected to the first mentioned gearing and turning therewith in both directions, and engaging with said worm, a second supplementary shaft journaled in said casing, gearing connected with the first supplementary shaft, a brake drum mounted on the second shaft, a brake ring surrounding said drum adjacent thereto having a plurality of cutaway cam shaped portions, rollers in said cutaway portions, yielding means for forcing said rollers into position to lock said drum and ring when the jack is descendinc, and a plurality of unlocking fingers for controlling said locking and braking action between the rollers, the drum, and the ring. and means for controlling the movement of said fingers, whereby the descent of the jack may be controlled as desired.

7. In a jack, an elevating screw and nut, a stationary casing mounted on the base ofthe ack, a sleeve actuated by said screw and travelling in saidcasing, a bearing for supporting said screw, gearing carried by said. screw, actuating gearing for engaging the first mentioned gearing, a ratchet and pawl connected with said actuating gearing, a transversely located supplementary shaft, a worm mounted? thereon, said shaft being journaledin the casing, a worm wheel connected to the first mentioned gearing and turning therewith inboth directions, and engagingwith said worm, a second supplementary shaft journaled in said casin gearing connected with the first supplementary shaft, a brake drum adjacent thereto having a plurality of cutaway cam shaped portions, rollers in said cutaway portions, yielding means for forcing said rollers into position to lock said drum and ring when the jack is descending, and a plurality of unlocking fingers for controlling said locking and braking action between the rollers, the drum, and the ring, and means for controlling the movement of said fingers, whereby the descent of the jack may be controlled as de sired, said brake drum and said gearing being located at the base of the jack. is

8. In a self-lowering lifting jack, a standard having a chamber at one side of its lower end; a ram reciprocable in said standard; a nut in said ram; a rotatable screw in said nut a gear on the lower end of said screw; a driving gear meshing therewith; a worm gear beneath said screw gear and rotatable therewith; a worm meshing with and rotatable by said worm gear; and mechanism within said chamber actuated by the rotation of said worm for retarding the movement of said ram during the lowering thereof.

9. In a self-lowering lifting jack, a standard having a chamber at one side of its lower end; a ram reciprocable in said standard; means for imparting reciprocatory movement to said ram including a gear rotatable about the axis of said ram; a driving gear meshing with said rotatable gear; a worm gear beneath said rotatable gear and revoluble therewith; a worm meshing with and rotatable by said worm gear; and mechanism actuated by the rotation of said worm and enclosed within said chamber for retarding the movement of said ram during the lower ing thereof.

10. In a self-lowering lifting jack, a stand ard having a chamber at one side of its lower end; a ram reciprocable in said standard; means for imparting reciprocatory movement to said ram including a gear rotatable about the axis of said ram; adriving gear meshing with said rotatable gear; a bearing plate beneath and revoluble with said rotatable gear provided with worm gear teeth; a worm meshing with and rotatable by said worm gear teeth; anti-friction members supporting said bearing plate; and mechanism Within said chamber'actuated by the rotation of said worm for retarding the movement of said rain. during the lowering thereof.

11. In a self-lowering lifting jack a stand ard provided with a lateral hub and having a chamber at one side of its lower end; a removable bushing in said hub; a ram roeiprocable in said standard; means for im- ')arting reeiproeatoiw mm'ement to said ram including a gear rotatable about the axis of said ram; a driving gear meshing with said rotatable gear having its shal't positioned in said bushing; a worm gear beneath said r0- tatable gear and revolnble therewith; a worm meshing with and rotatable by said worm gear; and mechanism within said chamber actuated by said worm for retarding the movement of said ram during" the lowering thereof.

12. In a selt-l0wering lifting; jaclc, a standard having a chamber at one side of its lower end; a base threaded t0 the lower end of said standard; a ram reeiprocable in said standard; means for imparting reciprocatory movement to said ram including a gear rotatable about the axis of said ram; a driving gear meshing with said rotatable gear; a worm gear beneath said rotatable gear and rerolnble therewith; a worm meshing with and rotatable by said worm gear; a bearing disk positioned on said base; anti-friction members between said disk and worm gear; and mechanisn'i within said chan'lber actuated by said worm for retarding the move ment of said ram din-mg the lowering thereof.

In testimony whereof, I aliix my signature.

CHARLES Vii RIPStll-l.

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