US2696648A

US2696648A - Portable pull jack

Info

Publication number: US2696648A
Application number: US282390A
Authority: US
Inventors: Sperti Vincent Robert
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-04-15
Filing date: 1952-04-15
Publication date: 1954-12-14
Anticipated expiration: 1971-12-14

Description

Dec. 14, 1954 v. R. SPERTI 2,696,548 I PORTABLE PULL JACK Filed April 15, 1952 f/EZ. FL

'INVENTOR.

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United States Patent ()fiice 2,696,648 Patented Dec. 14, 1954 PORTABLE PULL JACK Vincent Robert Sperti, Baltimore, Md. Application April 15, 1952, Serial No. 282,390

1 Claim. (Cl. 24-711) This invention relates to improvements in pulling jacks and more particularly to those adapted to be connected to various points on a chain so the drawing power of the jack may be applied to any selected part of the chain.

In most of the pull jacks known to the public, the pull chains form an integral part of the device and cannot be removed from the jack, the jack is permanently aflixed to the center of chain, and cannot be adjusted thereon, to suit the varying conditions to be met during its use.

It is therefore an object of this invention to provide a pull jack that can be removably attached to a chain at a point where it will be closest to the point where the pull is to be applied.

It is further an object of this invention to provide a new and improved pull jack adaptable for attachment to a cable, chain or other fastening means.

Another object of this invention is to provide a portable pull-jack of the adjustable type for connecting to and pulling on a chain or the like without twisting same during the operation.

A still further object of this invention is to provide a portable baseless pull jack of the type described capable of pulling from one or a plurality of sides.

A further object of this invention is to provide a suspension pull jack for removable attachment to a pulling medium for realining automobile fenders or other portions thereof.

Other objects of the invention will become apparent as the invention is more fully set forth.

For a better understanding of the invention, and its principles and operation, reference is made to the accompanying drawings, which disclose a particular form of the invention by way of example and not of limitation. These drawings are explained in the following description while the claim indicates the scope of the invention.

Referring to the drawings:

. Figure 1 is a plan view of a pull-jack embodying this invention;

Figure 2 is a sectional elevation taken along line 2-2 of Figure 1;

Figure 3 is a side elevation of Figure 1, with parts broken away to show its inner construction;

Figure 4 is a typical section View taken through a modified form of screw tensioning means and with a swivel collar; and

Figure 5 is a diagrammatic view of the pull-jack attached to an automobile in position to pull the fenders towards the center of the automobile.

Similar reference numerals refer to similar parts throughout the drawings.

In the construction shown in the drawings, a pull-jack casing of semi-elliptical shape supports the operating mechanism. The lower end walls of the Wider portion are flared out at 11 to allow the chain to pass along the flared portion 11 without becoming entangled with casing walls. The opposite walls of the smaller portion of the casing are bent inwardly at 12 and extend below the flared portions 11. The upper end of the casing is provided with a top 13 with a hole 14 projecting therethrough to rotatably receive the shoulder 15 of a nut 16. The shoulder 15 is provided with a collar 16 adjustably tightened thereto by a screw 17. The nut 16 is threaded to receive a screw stem 18 that moves up and down therein depending on the direction of rotation of the nut. The lower end of the screw 17 is attached to guide plate 19 slidably fitted inside the casing 10, the guide plate 19 is provided with a member 20 having its lower end bent to form a hook 21 to receive a chain 22 or the like during the operation of the device.

In Figure 4 is shown a modified form of the pull-jack with its casing 26 formed as described above. The screw stem 23 is raised and lowered in the threaded portion 24 of the top 25 and is undercut at 27 to receive a guide member 28 with its ring 29 to which are attached chain members 30 used for attachment to the automobile or other device the pull jack is used with.

While two general forms of the invention are shown inthe drawings and described in the specification, it is not desired to limit this application for patent to these particular forms as it is appreciated that other forms could be made that would use the same principles and come within the scope of the appended claim.

Having thus described the invention, claimed is:

A portable pull-jack comprising a hollow casing of elliptical cross-section, said casing having its lower walls flared outwardly in the direction of the greatest diameter of the elliptical cross-section, and said lower walls tapering inwardly in the direction of the smallest diameter of the elliptical cross-section, the upper end walls of the casing being bent at right angles to the longitudinal axis of the casing to provide a closure therefor, said closure having a central opening therethrough, a guide member within the casing having an elliptical periphery cooperating with the elliptical casing whereby said guide member is non rotatable within the casing, an internally threaded nut mounted and rotatably held in the aforesaid opening, a screw having one end secured to the guide member and having its opposite end threadedly received within the internally threaded nut, an element secured to the guide member on the side thereof opposite to the screw and at a point of said guide member offset from the center thereof, said element tapering inwardly of the casing and terminating in an upwardly projecting hook, the center of said hook being in alignment with the center of the guide member, whereby the link of a chain placed on the hook will be guided in extended position inwardly and upwardly of the casing through the aforesaid flared walls of greatest diameter upon rotation of the nut causing upward translation of the screw and guide member, while the hook carrying the chain will be guided inwardly and upwardly of the casing by the aforesaid tapered walls of smallest diameter.

what is References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 371,792 Sabourin Oct. 18, 1887 505,527 Hunt, Jr. Sept. 26, 1893 2,188,937 Bertram Feb. 6, 1940 2,247,642 Neville July 1, 1941 2,567,270 Belich Sept. 11, 1951