US945334A

US945334A - Ratchet-jack.

Info

Publication number: US945334A
Application number: US43278308A
Authority: US
Inventors: Alvah F Lent
Original assignee: Individual
Current assignee: Individual
Priority date: 1908-05-14
Filing date: 1908-05-14
Publication date: 1910-01-04
Anticipated expiration: 1927-01-04

Description

A. F. LENT.

RATCHET JACK.

v APPLICATION FILED MAYM, 190s.

Patented. Jan. 4, 1910.

M ATTORNEYS" INVENTOR'. Blvath F .Leqt 4:2

2 BHEETS--SHEET 1.

lia? rlw A. F. LENT.

RATUHET JACK. APPLICATION FILED MAY 14, 1008.

945,334. Patented J 4-, 1910.

2 BHBBTS-BHEET 2. 55

ATTORNEYS ALVAH F. LENT, 0F NEWARK, NEW JERSEY.

RATCHET-LTACK.

Specification of Letters Patent.

Patented Jan. 4, 1910.

Application filed May 14, 1908. Serial No. 432,788.

- all whom ct may concern;

Be it known that I, ALvArL F. LENT, a citizen of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Ratchet-Jacks;'and I do hereby declare the following to be a full, clear, and exact description of the invcntiomsticl as will enable others skilled in the art to which it appcrtains to make and use'tbe same, reference being had to the accompanying drawings, and to characters of reference marked thereon, which form a part of this specification.

- My invention relates to improvements in ratchet-jacks and comprises a jack adapted for use as a sewer jack, or for lifting heavy objects, or for stretching wire, cables or the like, or for other ,uses for which such jacks are commonly employed.

My said jack comprises two telescopic members of cruciform shape in cross section, one member titting within the other,

the ribs of such inner member nttin within recesses in the outer membe'r formed within the ribs of such outer member, and guided thereby; said inner member having ratchet teeth on one of its ribs, the outer member having an opening opposite a portion of the ratchet toothed rib of the inner member, and having a holding pawl adapted to work through such openingagainst such teeth, and having also fulcrum-pins adapted to be engaged by a ratchet bar, itself provided with a tooth to engage the said ratchet teeth through the said opening.

My invention further comprises an improved construction of the ratchet bar.

The objects of my invention are toimprove the construction of jacks such as referred to, to make such jacks of great strength and stifiness in proportion to the amount and character of metal used, and to make such jacks very simple, easily constructed, easily operated and relatively inexpensive. V

I will now roceed to describe my invention with re erence.to the accompanyin drawings andwill then point out the nove features in claims.

In said drawings: Figures 1 and 2 are respective] a side elevation and a front view of one orm of my-s'aicl jack, and Fig. 3

shows a central longitudinal section of such 5 jack on a plane parallel to that of Fig. 1.

Flo 4 shows atmnsversc section of the jack and the ratchet-bar for operating it, the

section being taken on the line 1- 1 of Fig.

1, looking in the direction of the arrow m.

Fig. 5 shows a transverse section of the jack taken on the line 55 of Fig. 1, looking in the direction of the arrow y, both of these views being on a scale larger than that of Figs. 1-3 lnclnsive. Fig. 6 is a side view of an alternative form of jack particularly adapted for stretching wires and cables and the like; and Fi 7 is a central longitudinal section of this alternative form of ]tlCl The form of the jack shown in Figs. 13 inclusive, is a form particularly adapted for use as a sewer jack, or for lifting weights, and similar purpdses.

Referring first to Figs. 15 inclusive, the jack there shown is designated by the general reference character 1; said jack comprising an inner member 2, of cruciform shape in cross section, and an outer hollow member 13, also of cruciform shape in cross section; the inner space of this member 13 being also cruciform in cross section. Memher 2 is arranged to telescope within member 13. By reason of its cruciform shape in cross section, member 2 has

ribs

3, 4, 5 and 6 of which rib '5 is provided with ratchet ,tceth 7. The member 13 has corresponding in all directions and have maximum strength and stiffness, for the amount and character of material used in their construction. At the same time the forms of these parts are very simple, so that they are readily constructed.

The outer jack member is provided in its rib 16 opposite the ratchet toothed rib 5 of the other member 2, with an opening 18 through which a fpawlof a ratchet bar hereinafter mentione may on age the teeth 7; this opening being, refera 1y, much shorter than the total lengt 1 of the toothed portion of the rib 5. Jack member 13 also is provided with lugs 19 su porting, by means of a pivot pin 20, a hol ing pawl '21 having a tooth 22, likewise adapte to project through opening 18 into engageme with one or another of the teeth 7; a spring 23 being provided which engages the rear or handle end 2a of this pawl 21, said spring tending to press said rear portion of the pawl outward, so as to hold the tooth in engageshown, to lit over fulcrum pins progeciing;

- I have avoided the use of from :the siderios l4. and lb of jack member 13; said fulcrum pins lying within the main lateral width or member 1:; measured n a direction at right angles to the axis of these fulcrum pins 34, so that in this jack the extending lugs to support a fulcrum pin, with which most ratchet jacks are provided, which lugs usually extend so far outward asto be much in the way and to add considerably to the weight of the jack, besides making the jack more difiieult to construct. The lower lugs 37 of the ratchet bar have a curved bearing surface'with respect to the fulcrum pins 34$, so that when the ratchet bar is'in use the pressure is distributed well over the surfaces of these fulcrum pins. The inner edges of the upper lugs 38 of the ratchet bar are preferably straight, as this facilitates the passin of the ratchet bar over the fulcrum pins? ithin the forked end of the ratchet her there is a pawl 42, pivoted to said ratchet bar by pin 41, and adapted to engage the teeth"? through the opening 18. The location ofthis pawl 42, within the forked end of-the ratchet bar, is such that said pawl is practically protected against breakage when the bar is removed from the jack, said bar being. then in effect a simple, practicallystraight bar, free from projecting parts which complicate the construction of the bar and which are apt to be broken oil".

The jack may,be provided with various forms of end pieces to adapt for various uses. in the form shown, in Figs. 1-3 1n- "elusive l' have shown it provided with base,

pieces 10 and 31,011 its opposite ends, connected to the members2 and 13 respectively, by ball-and-socket o1nts, co1'nprising ballshaped ends 9 and 30, respectively, embraced by ears 11 and 31 respectively of the base pieces 10; and I have shown these base pieces provided with teeth or serrations, l2 and 33; but the particular construction of the base pieces is optional. Since the member 18 is'hollow, its ball-shaped end com prises a body 27' adapted to fit within the.

end of the member and held therein by suitable meansyas forexarrlple by a transverse" pi1' 1'281 Thejack asv "so constructed may be'usedas an ordinai'y ratchet jack, for lifting weights or for bracing the sheathing of sewer trenches, "and for like uses. I have also shown the member 13 provided on its rear side, with hook 455 provided with an eye 44, wh ch hook, or oryboth, may be used for the sita tor the end of a cable, chain, wire the like, when the jack is to be used for drawing taut a chain, or cable, or wire, or the like.

in the alternative construction shown in igs. 5 and 6,1 have shown the men1ber 2- This jack is to be used in the usual man ner and therefore no special description of sucn method of use is requned. It will be observed that the ratchetbar; 3515 readily attached or detached, and when thejack has once been adjusted, this ratchet bar will customarily be removed so that it is at once out of the way and not liable to be broken. The holding pawl 21 is provided near its tooth 22, with laterally projecting lips 25 adapted to ride upon'the sides 26, of the opening 18, and thereby to prevent the tooth of said pawl from dropping too far between the teeth 7. These ribs also prevent the saring 23 from working loose.

In order that the pawl 42 may never move to a. position such that it will interfere with placing the ratchet bar on the jack, said pawl is provided with a rearward projection 46 which prevents said pawl from moving into line with the ratchet bar itself.

What I claim is:

l. A ratchet jack comprising two members of cruciform-shape in cross section, one member adapted to slide within the other, its ribs guided by the'sides of recesses formed in the ribs of theother said member, said inner member provided on one of its ribs with ratchet-teeth, the corresponding rib of the other member having an opening; said outer member provided with a holding 'pawl adapted to engage said teeth through said opening, and having on its side ribs,

laterally projecting fulcrum pins adapted for engagement by a ratchet bar..

2. A ratchet jack comprising a tubular. member and another member adapted to slide back and forth. within said tubular member, said tubular member of cruciform shape in cross section inside and outside, the

channels within its ribs forming guides for the inner member, said inner member also cruciform in cross section, one of the ribs of said inner member providedwith ratchet teeth, the corresponding rib of the outer member -.having an opening, said. outer. member provided with .a spring actuatedj holding pawl adapted, to engage said teeth through said opening, and having'on its side ribs laterally projecting fulcrum pins lying within the width of said outermember nieasuredin a direction at right angles to the axis of said fulcrum pins, said pins adapted for engagement by a ratchet bar.

3. 1n a ratchet jack, the combination, with telescopic jack-members, one of which is provided with ratchet teeth and the other with laterally projecting fulcrum-pins, of a 5 forked ratchet-bar having the ends of its fork slotted to fit over and engage said fnlcrnm pins and,having within its fork a pawl adapted to engage the 'said ratchet teeth.

10 4. In a ratchet jack, the combination, with teltFcopic jack-members.one of which is provided with ratchet teeth and the other with laterally projecting fulcrum-pins. of a forked ratchet-bar having the ends of its '15 fork slotted to tit over and engage said 't'nlcrnm pins and having within its fork a pawl adapted to engage the said ratchet teeth, said pawl pro\ idctl with a rearward projection' adapted to engage the hack of the are forked portion of said bar and thereby prevent said pawl from moving into line with the fork.

5. In a ratchet jack, the combination with two telescopic members adapted to fit one within the other, said inner member provided \vlh ratchet teeth, of a holding pawl pivoted to the outer member and adapted to engage said ratchet teeth, and having laterally projecting lips arranged to engage the sides of said outer member and regnlateih 30 extent of movement in one directionof sai pawl, and a spring for pressing Stll d'ptWl into engagement with Etlld teeth.

In testimony, that I claim the invention .aet forth above I have herenntoset myhand 35 thisl lth day of May 1908.

. ALVAH F. LENT. \Yitnesses l I Fin-ink. (J. l aann'rznn, .\x.\.\ ll. ALTER.