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Publication numberUS3870278 A
Publication typeGrant
Publication dateMar 11, 1975
Filing dateMar 18, 1974
Priority dateMar 18, 1974
Publication numberUS 3870278 A, US 3870278A, US-A-3870278, US3870278 A, US3870278A
InventorsLee George W
Original AssigneeBooker Arnold Bryce
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Telescoping stand jack
US 3870278 A
Abstract
An improved telescoping stand jack having a base standard and at least one telescoping cylinder extendible thereabove, with both being provided with travel and detent slot patterns accommodating selected, discrete positionment of stop pins. In a preferred form of the invention the detent slots of the intermediate cylinder are spaced more closely than those detent slots of the base standard, this so that a wide range of adjustment can be had with a minimum of effort. An upper threaded shaft is employed in the combination for finalizing height adjustment. A series of alternately selectable fittings are provided the jack to perform a variety of respective support functions. Improved ratchet means are employed for rotating the threaded shaft for such final adjustment, as desired.
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Description  (OCR text may contain errors)

Unite Sttes Lee aterat [191 [451 Mar. 11, 1975' 1 TELESCOPING STAND JACK [75] Inventor: George W. Lee, Rangely, C010.

[22] Filed: Mar. 18, 1974 [2]] Appl. N0.: 452,197

[52] U.S. Cl. 254/98, 248/354 P, 248/354 S [51] Int. Cl B66f 3/08 [58] Field of Search 254/98-1-03,

254/l33.l, DlG. 4, D16. 1; 248/354 P, 354 S; 74/579, 578

FOREIGN PATENTS OR APPLICATIONS 154,687 9/1904 Germany 254/131] Primary ExaminerOthell M. Simpson [57] ABSTRACT An improved telescoping stand jack having a base standard and at least one telescoping cylinder extendible thereabove, with both being provided with travel and detent slot patterns accommodating selected, discrete positionment of stop pins. [n a preferred form of the invention the detent slots of the intermediate cylinder are spaced more closely than those detent slots of the base standard, this so that a wide range of adjustment can be had with a minimum of effort. An upper threaded shaft is employed in the combination for finalizing height adjustment. A series of alternately selectable fittings are provided the jack to perform a variety of respective support functions. lmproved ratchet means are employed for rotating the threaded shaft for such final adjustment, as desired.

10 Claims, 8 Drawing Figures TELESCOPING STAND JACK The present invention relates to improved telescoping stand jacks and, more particularly, to a new and improved stand jack which, by its structure, provides for ready coarse adjustment as to height to approximate the verticaljack dimension needed, with remaining fine adjustment being supplied by screw thread means.

In the past, many stand jacks have been devised of a telescoping nature, but these generally required extended periods of handling manipulation so that the requisite jack height needed could be reached.

In the present invention, plural telescoping cylinder members incorporate respective detent and travel slot patterns so that a ready extension of telescoping members to the rough height needed can be made. A screwthreaded adjustment is provided for the final adjustment needed, and ratchet means is provided such screw-threaded adjustment to effect the same, both under free travel and load conditions.

The improved ratchet means as shown and described will operate satisfactorily for turning the threaded shaft in the desired direction, and this without the usual extensive machining costs that are involved in connection with existing ratchets.

Means are provided for reducing to a minimum the likelihood of accident or the accumulation of foreign matter between telescoping surfaces. 1

Accordingly, a principal object of the present invention is to provide a new and improved telescoping stand jack.

A further object is to provide a telescoping stand jack having at least two and perhaps a series of telescoping members which are provided with respective detent and travel slot patterns accommodating rough jack adjustment, the final adjustment being made by provided screw thread means.

An additional object is to provide a support fitting and, therewith, a series of load bearing engagement members.

A further object is to provide ratchet means for the screw-threaded portion of a jack so that said screwthreaded portion can be easily rotated in either direction and by novel means and inexpensive manufacture.

The features of the present invention which are believed to be novel are set forth with particularity in the appended claims. The present invention, both as to its organization and manner of operation, together with further objects and advantages thereof, may best be understood by reference to the following description, taken in connection with the accompanying drawings in which:

FIG. 1 is a front elevation, partially in section, of one embodiment of stand jack according to the invention.

FIG. 1A is an enlarged fragmentary section taken along the line 1A1A in FIG. 1.

FIGS. 25 are side elevations of various load support members that can be used with the stand jack of FIG. 1.

FIG. 6 is an enlarged horizontal section taken along the line 66 in FIG. 1.

FIG. 7 is a view similar to FIG. 6 but illustrates the ratchet means as being connected for opposite revolvement.

In FIG. 1 upright standard 10 includes a horizontal support base 11 and, welded thereto, a centrally upstanding base cylinder 12. Base cylinder 12 includes a slot pattern 13 comprising travel slot 14 and a series of declining detent slots 15. If desired, an exterior cover plate C, the periphery of which is shown in dotted lines,

may be included to cover this travel slot so that the slot pattern area will not be open to childrens fingers or for the entrance of foreign matter.

Intermediate cylinder 16 telescopes within standard 10 and itself includes a slot pattern 18 comprising travel slot 19 as well as a series of depending detent slots 20. Intermediate cylinder 16 also includes pin means 17 which, as seen in FIG. 1, is disposed in a respective one of the detent slots 15 of cylinder 12 and which extends radially outwardly to so engage such slot pattern. A corresponding reaction pin 22 is associated with upper cylinder 21, and its outward orientation is clearly illustrated in FIG. 1A wherein the pin 22 com prises, for example, an Allen screw which is threaded in threaded aperture 22A of upper cylinder 21. The pin means, as to both elements 17 and 22, may take any one of several forms; it is desired, however, that the pin element be threaded into the wall of the respective cylinder.

It is thus seen that the intermediate cylinder 16 includes not only the slot pattern but also, therebelow, the radially outwardly extending pin 17.

Upper cylinder 21, in addition to including the reaction pin, 22, is provided with an interior threaded portion I which receives the threads 24 of manually rotatable threaded shaft 23. Upper, load-bearing support portion 26 may be provided with a spring-loaded check ball 27 for receiving a selected attachment member 28.

Member 28 will be chosen in design to support a given load. Thus, as to FIGS. 1 and 2, the attachment member 28 includes an inverted cup 30 supporting plate 29 welded thereto; the combination likewise may include an annular recess 47 for receiving ball 27.

Alternative forms of the attachment member are shown in FIGS. 35. In FIG. 3 attachment member 31 is provided with an angular support member 34 supported by suitable webs and a plate structure P, the same also attaching to the inverted cup 30. In FIG. 4 an alternate attachment member 31A is shown to include an arcuately curved member 35 supported by webs 32 and attached to the inverted cup 30 as before mentioned.

In FIG. 5 the arcuate attachment member 318 shown therein includes not only the plate 33 and inverted cup 30 but also an upstanding spike 36. The structure may be welded together, and the spike serves for penetration into a log or rough lumber.

In FIGS. 1, 6 and 7, it is seen that a ratchet handle 37 is provided. The same is preferably made of spring steel such that the inwardly turned ends 38 and 39 thereof may be urged resiliently outwardly. Such inwardly turned ends include respective, straight and chamfered ends 41 and 42 as seen in FIG. 7. The ratchet means engagement portion 25 of threaded shaft 23 include, between portions 46,- a series of radial bore depressions 43 arranged in quadrature, such bores having chamfered or relieved camming edges as at 44. These chamfered edges serve as camming surfaces to force the chamfered end 41 outwardly into revolving ratchet ring 45 as the ratchet is turned as hereinafter described. v

A ratchet ring 45 is provided and is supported in and retained in place by C-rings C fitted into conventional grooves in shaft 23.

Thus, and as to operation, it is noted that when the handle is lifted up from its essentially vertical position as shown in FIG. 1 to a horizontal position as shown in FIG. 6, then the ratchet ring can be turned by the handle being moved in a clockwise direction as shown by the arrow in FIG. 6. During such turning the inwardly pointed end approximate surface 41 engages the bore wall of portion 25 so that the threaded shaft 23 may be correspondingly rotated. it is noted that as the handle is returned in FIG. 6 in a counter-clockwise direction,

preparatory to a new ratchet-turn stroke, that the camin either a clockwise or a counter-clockwise direction,

and this from a single operator position.

While it is permissible that the ratchet engagement portion 25 may take another form or may simply be engageable by an end wrench or crescent wrench, it is believed that the present construction is not only inexpensive but highly suitable for this operation wherein the ratchet effect can be obtained merely by supplying the resilient ratchet handle 37 in combination with the remainder of the structure as shown.

Turning to FIG. 1, it is to be noted that highly preferred in the invention is the respective slot pattern feature such that the upper detent slots of slot pattern 18, relative to the intermediate cylinder 16, are more closely spaced together than the declining detent slots of slot pattern 13. This is so that the base standard can provide a relatively coarse incremental adjustment of the jack, the middle slots can provide a smaller or intermediate adjustment of jack height, leaving only a small movement to be accomplished relative to the threaded shaft 23 as performed by ratchet handle 37.

The end result is a jack that is very easily manually manipulated by being extensible where both pins 17 and 22 are in their respective travel slots 18 and 19. Further, the declining positionment of the detent slots makes possible a rapid pulling-out or extension of the sections of the jack. Thereafter, the intermediate and- /or upper cylinders are simply rotated slightly such that the respective pins engage the desired detent slots. Accordingly, there will be, finally, only a very little threaded adjustment needed with respect to manually rotatable threaded shaft 23 in order to bring the upper support surface of attachment member 28 to the lower surface of the load to be supported.

While particular embodiments of the present invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications' may be made without departing from this invention in its broader aspects, and, therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of this invention.

I claim:

1. An improved telescoping stand jack including, in combination, a standard having a support base and a base cylinder centrally upstanding therefrom, an intermediate cylinder telescoping within and extensible from said base cylinder, an upper cylinder telescoping with respect to said intermediate cylinder and having an interior threaded portion and a radially outwardly extending reaction pin, a manually rotatable threaded shaft threadedly engaging said upper cylinder interior portion and provided with upper load bearing support means, said base and intermediate cylinders each being provided with respective slot patterns comprising a longitudinal travel slot and a series of mutually spaced, declining detent slots contiguous therewith, said intermediate cylinder including pin means disposed beneath said slot pattern thereof and positioned within said slot pattern of said base cylinder, said pin means of said upper cylinder being linked to said slot pattern of said intermediate cylinder.

2. The jack of claim 1 wherein said pin means is contained within said slot pattern of said base cylinder.

3. Structure according to claim 2 wherein a cover plate is affixed to said base cylinder and disposed over said slot pattern thereof.

4. The jack of claim 1 wherein said threaded shaft includes an upper, ratchet means engagement portion, said jack including handle means for releasably engaging and thereby selectively rotating said ratchet engagement portion.

5. Sructure according to claim 4 wherein said handle includes inwardly directed extremities one of which is chamfered.

6. The jack of claim 1 wherein said threaded shaft includes an upper, load-bearing attachment receiving portion, said jack including a load-bearing fitting disposed upon said portion.

7. Structure according to claim 6 wherein said fitting includes a load-bearing portion and an upwardly oriented spike.

8. Structure according to claim 6 wherein said fitting includes a depending cup and an upwardly concave angular member supported by and affixed to said cup.

9. Structure according to claim 6 wherein said attachment member comprises an inverted cup and a horizontal plate secured to and above said cup.

10. An improved telescopingjack stand including, in combination, plural telescoping members comprising a series and having respective means for mutually, releasably detent positioning said members, an upper screwthreaded member threadedly supported by and operatively engaging an upper one of said series, load supporting means upstanding from said screw-threaded member, and ratchet means for revolving said screw threaded member, said ratchet means comprising a U- shaped, resilient lever handle having inwardly directed ends, said screw-threaded member having plural radial bores selectively receiving said ends, and a ring member rotatably mounted about said screw-threaded member and over said radial bores and journaling said

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Referenced by
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US4838135 *May 11, 1987Jun 13, 1989Hevoyan Varoujan HWork transport for machine tools
US5131628 *Sep 24, 1991Jul 21, 1992You Jin Industrial Co., Ltd.Mechanical jack
US5273256 *Oct 20, 1992Dec 28, 1993Atwood Industries, Inc.Quick-to-ground camper jack
US5379974 *Apr 23, 1992Jan 10, 1995Safe-T-Jack, Inc.Alignment and locking mechanism for extendible jack stand
US5583288 *Jul 11, 1995Dec 10, 1996Brenner; Daryl E.Combination vehicle brake light inspection device and tire billy
US5862635 *Sep 16, 1997Jan 26, 1999Magnum Foundation SystemsSupport system for a building structure
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US7344117 *Dec 30, 2005Mar 18, 2008Benq CorporationAdjustable lift support apparatus
US7390147Nov 2, 2006Jun 24, 2008Jennmar CorporationYieldable prop having a yield section
US7445408Oct 6, 2006Nov 4, 2008Jennmar CorporationYieldable prop having a restraint arrangement
US8001733 *Dec 4, 2009Aug 23, 2011Min ChenAdjustable jack post
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Classifications
U.S. Classification254/98, 248/354.3, 248/354.6
International ClassificationB66F3/00, B66F1/04, B66F3/14, B66F1/00
Cooperative ClassificationB66F3/14, B66F1/04
European ClassificationB66F1/04, B66F3/14