US1546472A

US1546472A - Jack

Info

Publication number: US1546472A
Application number: US2667A
Authority: US
Inventors: Butta Giovanni Luigi
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-01-15
Filing date: 1925-01-15
Publication date: 1925-07-21
Anticipated expiration: 1942-07-21

Description

1 2 4 7 I M M Z M w 0 4 W 5 U .0 1 I July 21, 1925.

G. L. BUTTA JACK Filed Jan. 15, 192

' Giovanni luigi Bufla/ Inventor.

Aiiomeys Patented July 21, 1925.

UNITED STATES GIOVANNI LUIGI BUTTA, OF CONCORD, NEW SOUTH WALES, AUSTRALIA.

JACK.

Application filed January 15, 1925.

T 0 all whom it may concern:

Be it known that GIOVANNI LUIGIYBUTTA, subject of Great Britain, residing at El Retiro, Correy Avenue, Concord, in the State of New South 1V ales, Commonwealth of Australia, has invented certain new and useful Improvements in Jacks, of which the following is a specification.

The invention relates to lifting and lowering jacks of the class comprising telescoping screws provided with ratchet devices adjacent the points where one screw enters another, such devices being oppositely disposed and reversible so that the jack may be raised or' lowered with a double action whereby loss of motion in manipulating the jack is avoided.

The present invention has for its object to provide an improved jack 'of this class in which the construction is simplified and which has the added advantage that it can be largely manufactured from standard commercial material. The invention also makes it possible to make all the screws of the same thread, either all right-handed or all left handed.

The invention comprises a screw threaded standard in which is slidably mounted a screw threaded member, a single casing surrounding the junction of such standard and member and carrying reversible pa-wls which respectively engage ratchet teeth on nuts on said standard and member.

Referring now to the accompanying drawings which illustrate by way of example one convenient embodiment of the invention Figure 1 is a central vertical section of the. improved jack in extended position with certain parts omitted or broken away.

Figure 2 is a central vertical section on a large scale showing the jack in collapsed posit-ion.

Figure 3 is a detail vertical section on a. large scale, and

Figure a is a detail perspective view.

The jack may be provided with any suitable base, that shown in the drawing being a plate 10 of large diameter having a central boss 11 and being axially bored and internally screw threaded at 12 to receive the screw threaded lower end of the standard 13. The standard 13 is of any suitable length and externally screw threaded from the top downwardly throughout the major portion of its length; slidable within Serial No. 2,667.

the standard 13 is an externally screw threaded tube 14: of greater length than the standard and slidable Within the tube 14: is a screw threaded rod 15 upon which is a nut 16 and a. bearing block 17 integral with or secured to its upper end by means of the screw 18. Screwed on to the standard 13 is a nut 19, another nut 20 being screwed on to the tube 14; and interposed between these two nuts and surrounding the standard 13 is a tubular distance piece or slidable sleeve 21 that is provided with a centrally situated annular channel 22. Surrounding the

nuts

19 and 20 and the slidable sleeve 21 is an, outer casing 23 that is centrally bored and tapped to receive a screw 24, the end of which passes through the casing 23 and lies slidably within the annular channel 22 in the slidable sleeve 21. The outer casing is also provided with upper and lower

tubular bosses

25 and 26 that form housings for their respective spring operated reversible pawls 27 and 28. Centrally upon the outer casing is a lug 29 that lies in the slotted end 30 of the telescopic lever 31 and whereby the latter may be pivotally secured at 32. The lever 31 is axially bored throughout a portion of its length from the outer end thereof to slidably receive a rod 33 that has formed or secured to its outer end an internally threaded cap 34 adapted to be screwed on to the outer end of the lever 31. The lower end of the casing is closed by a washer-like plate 35 that surrounds the standard 13 and is secured to the end of the casing 23 by means of the screws 36. The upper end of the casing is also closed by a washerlike plate 37 that surrounds the tube 14 and is secured to the upper end of the casing by means of the screws 38. The nut 16 is seated upon the plate 37 or adjacent thereto when the appliance is in its collapsed position while the nut 20 lies immediately below that plate and within the casing 23. Each of the

nuts

19 and 20 are provided with ratchet teeth 39 cut upon their external peripheral face, the

respective housings

26 and 25 being positioned so that the spring operated pawl carried thereby will engage with their respective ratchet teeth.

The

bosses

25 and 26 are each externally screw threaded to receive a specially constructed internally screw threaded cap 40.

'Eachpawl 27 and 28 is secured to one end of or is integral with a rod or stem 41 that passes slidably. through a hole bored axially in the topof the cap 40, the other end of the stem 41 being provided with milled head or nut 42 by means of which the, pawls may be manually adjusted. The cap 40 is diametrically slotted at 43 in order that the pin 44, that passes through and is rigidly secured to the stem 41, may normally lie therein in order to maintain the pawl in its proper position. The depth of the slot 43 will be such that when the milled head 42 with its stem '41 and pawl 28 (or 27) is pulled outwardly and given a quarter turn the pin 44 will lie upon. the outer extremity of the cap 40 transversely across. the slot 43 and the pawl 28 (or 27) be thereby held clear of'the ratchet teeth 89 '(see pawl 27) in Figure 2. A helical spring 45 surrounds the stem 41 and is normally held in partial compression between a shoulder formed by the pawl and the under face of the top of the cap 40. Both the paw-ls 27 and 28 have a squareengaging'face and an opposite bevelled orrounded face so that alternately they will engage their respective ratchet teeth 39 whenthe outer casing is turned in one" direction and will move.

radially outward and pass over those ratchet teeth 39 when the casing is turned in the opposite dir ction.

In operating the appliance the ratchet teeth will be set oppositely so that they will engage their respective ratchets 39 alternately as the lever 31 is operated to rock the casing first in one direction and then o upward travel of .l .L L

.t it rotating upon rhnal slot 46 1S in order to limit the down- -ard movement of the parts upon the standard 1-3 a screw 51, (Figures 2 and 3) may be inserted in the slo 46 and adapted to form a stop for the nut 19, the screw 51 b 'n preferably at a point low enough to prevent the top of the sleeve 21 descending below the pin 49. Upward movement of the parts is arrested when the stop 47 abuts against the outer end of pin 49. Upward movement may if desired be stopped ings) which may be inserted in the tube 14 near the bottom of the slot 50 so that as the tube 14 is raised to its fullextent by the rotation of the nut 20 the screw will abut against the underside of the inner 'end ofthe. pin; 49 and prevent any further the upper end ofthe tube 14.

In operatingtheappliance for high lifts the rod 15 may be slid out of the tube a suitable distance and the nut 16 screwed down until ,it abuts against the top of the tube 14. The pawls 27 and 28 will'now be adjusted and the lever 31 raised toa position radial to the casing 23'and moving it back and forth in a horizontal plane until the desired 'heightis reached. l/Vhen lowering again the pawls' will. be reversed by pulling the upper and lower heads-42 outwardly and giving them a half turn and then releasing them' so as to allow the pins 44 to resume their position within the slots 43. By againxoperating the lever-'31 the tube 14 will be drawn downwardly into the standard 13 while the casing 23 and its attachments will be'drawn downwardly" upon the standard.

It will be apparent that, when the pin 41 of each pawl is resting on the outer extremity of the ca.p"40,the pawls are held clear of the ratchet teeth, and thusxthe jack may be locked in any desired position.

'l/Vhat I claim is:

1. 4 jack comprising a base-secured to an externally screw threaded tubular standard, an externally .screw threaded member slidable within -said standard, externally toothed nuts on" said standard and member, means for preventing rotation of said member, meansfor maintaining said toothed nuts at a constant distance apart, reversely disposed pawls for engaging the teeth on said nuts, a structure carrying both of the pawls and means for oscillating said structure about the axis of the standard.

2. 'A jack as defined in claim 1' having an externally screw threaded rod slidably IIIOLlIIlJGCl in said member, said rod'having a nut thereon and a thereto. t

3. A jack comprising a base securedto an externally screw threaded tubular standard, an externally screw threaded member slidable within saidfs'tandard',externallytoothed bearing block secured 1 I p v nuts on said standard and member, a tububy another s crew. (not shown in the draw lar distance piece or sleeve between saidv nuts and surroundlngsald standard, a longitudinalslot in -saidmember, a pin on the block 17 secured inany. suitable manner to v standard adapted to slide in said slot, an external longitudinal slot in said standard, an internal stop on the sleeve and adapted to slide in the slot in the standard whereby said externally screw threaded member and distance piece are prevented from rotating, a structure carrying the pawls and distance piece and means to oscillate said structure about the axis of the standard.

4. A jack as defined in claim 1 in which each reversible and disengageable pawl is slidably housed in a hollow boss formation secured to or integral with the casing and is provided with a stem that projects through a cap adapted to be screwed on to the boss, a transverse slot in the cap, a transverse pin rigidly secured to the stem and adapted normally to lie in the slot in the cap, a spring surrounding the stem and normally held in partial compression between the pawl and the inner face of the cap, a head or nut on the outer extremity of the stem whereby the pawl may, when required, be pulled clear of the ratchet and turned so that the pin may lie transversely across the slot and the pawl be thereby temporarily held disengaged from the ratchet.

5. A Jack as defined in claim 1 having a block integral with or secured to a screw threaded rod, a nut on said rod adapted to be seated upon the upper .end of the oscillatory structure for the purpose of adjusting the operative height of the jack, means for preventing the rod from rotating within the externally screw threaded member and means for limiting the upward movement of the said rod.

6. A jack as defined in claim 1 in which the oscillatory structure consists of a tubular casing enclosing the externally-toothed nuts and the distance piece or sleeve and adapted to move longitudinally therewith, and plates for closing the ends of said casing and wherein the oscillating means comprises a lever preferably pivotally connected to the casing whereby the latter may be rotated in opposite directions to cause the pawls alternately to engage the teeth on said nuts and rotate the said nuts in opposite directions.

7 A jack as defined in claim 3 wherein the pawl-carrying structure consists of a tubular casing and the means for oscillating said casing consists of a pivotally connected telescopic lever.

In testimony whereof I aflix my signature in presence of two witnesses.

GIOVANNI LUIGI BUTTA.

WVitnesses H. M; MORRIS, L. V. MAGUIRE.