US2719445A

US2719445A - Stud puller

Info

Publication number: US2719445A
Application number: US451007A
Authority: US
Inventors: Walter H Giebler
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-08-19
Filing date: 1954-08-19
Publication date: 1955-10-04
Anticipated expiration: 1972-10-04

Description

4, 1955 W. H. GIEBLER STUD FULLER Filed Aug. 19, 1954 United States Patenti() "ice dans STUD PULLER Walter ieblr, lilar aks, Calif. apartan@ Aligner 19,V 1"954; sera1N.\4s1,om s claims. (C1. s1-sa) T his inventionlrelate's irrgeneral to an improved hand tool for use by mechanics.

In "particular the invention is directed to, and it is a major object to provide, andi/el puller for end-threaded studs secured in, and projecting from, an engine blck or like; "the tool beingi peratiy'e to engage and unthread a stud "in apos'itive' manner; and without damaging th'e exposed threads even in those instances where the stud is initially extremely tight or stuck in the tapped bore from whichgit is to lurernoved. o Another important object of the present invention is to' provide a stud puller which embodies a novel, handle manipulated chck assembly adapted rfor ready and convenient engagement with, `or release from, a stud.

An additional object of the invention is toprvide a stud puller wherein the chuck is interchangeable whereby thetool can be accommodated to studs of different dianieters.

A further :object o f the invention `iste@ provide a stdpunj; which is adapted, in one entnommen, for use in connection with end-threaded Aundamaged studs, and 'in other embodiments with studs' which eitherfhavefmutilated threads 'orare brken off to short threads "or length.

It is also` an `object of the invention to provide a stud puller which is designed for ease and economy of manufacture. o o o Still another object of the/invention is to provide a practical, reliable, and durable stud puller, and eine which will b e exceedingly elective for the purpose for which it is designed. ,p y y p w l o These objects are accomplished by means of such `structure and relative arrangement `of parts as will fully appear by a perusal of the following specication `and claims.` o o In vthe drawings:` p l p Fig. 1 is a side elevation of the vstud'fpuller as in ilse.

Eig. 2 is an enlarged sectional elevation of the "stud puller, detached; the Vradialhandles forthe` lead screw being removed, and the radial handles for the sleeye being...Sho`wn broken olf. o o l "Eig, 3 is a sectional plan View taken on line 3"'-`3 fniga. l n y ,n

Fig. 4 is a sectional plan view of a modified form of chuck, detached. l

Fig. 5 is an elevation of a further modicatidn of the chuck, detached; the view being partly broken away and partly in section. V

Fig. 6 is a sectional plan view on line 6-*6 of Fig. 5.

Referring now more particularly to the drawings, and to' the characters of reference marked thereon, and at present to the embodiment shown in Figs. 1 3 inclusive,

the improved stud puller comprises a` sleeve 1 formed at its rear end with an enlarged head2.

A pair of opposed radial handles 3 and 4 are removably threaded at their inner ends in tapped radial sockets 5 and 6 in the enlarged head 2.

A relatively large-diameter lead screw 7 is threaded into the sleeve 1 from the rear end thereof; such sleeve Maint 2 Being app-ed, as at s, `for substantially naif of its length for thereception of such' screw. A

At its rearor 'outer end the" screw 7 is formed `with Aan enlarged head9`, and a pair ofpposed radial'yhndles yided sov that the screw 7 may be `worked by 4a 'soeket wrench engaged in said socket 14, and in which event the

handles

10 and 11 are of course unnecessary and are detached.

An elongated collet `type chuck 1S is: dispsed in the sleeve 1 between the inner end of the screw 7 and the forward end of saidA sleeve; the chuck projecting ahead of said sleeve some distance, as shown.

The forward end portion of" the sleeve 1 is tapered,

t as `a`t 16; i. e., has a progressively reduced internal diameter yt'oward its forward end, and the corresponding or forward portion of the chuck 15 is likewise tapered,` as at 17. Such` forward or tapered portion of the chuck 17` is contractibleand includes Alongitudirially extending spring jawsl18 which are `defined by circumferentially spaced, longitudinally extending splits or cuts 19 open to the forwardend ofsaid chuck. o o

The main, longitudinal, forwardly 'opening bore of the chuck 15 is indicated at 20, and such bore is` tapped, as at 21, to receive a stud thread of predetermined size.

The 'chuck 7151's circumferentally relieved, intermediate its ends, asat R, and in the radial zone of the rear end of the 15o`re20; this to the end that the jaws' 18am permitted to spring radially inwardly upon advance of said chuck 15 irthe sleeve 1 by running-in of the screw 7. The inner end of said `screw has a semis'pherical or rounded nose on itsin`ner end, which nose engages in matching relation in a concave end-opening seat 23` in the adjacent end of `the chuck 15. o

`The chuck 15 is formed with a plurality-here threeoflohg'itudinaL cireumferentially spaced keyways 24, and a short or stub pin 25 fixed in the side of the Sleeve V1 'engages in relatively slidable relation in one of the keyways 24. The pin 25, engaging in one: of the keyways 24",` as above, prevents the chuck 15 from undesirably turning in the sleeve 1 upon advance of said chuck by the" handle-`actuated screw 7.`

Theinner end portion of the chuck 15 is formed with a reduced-diameter central bore 26 which matches with a` corresponding bore 27 in the screw 7; these matching bores providing a clean-out passage, and additionally-#Qin connection with the` embodiments to be hereinafter describedpermit a drive-out rod to slide through the 'screw 7 into the chuck. o

When the above described stud puller is in use a `chuck 15 having the proper tap diameter is inserted in the sleeve 1,1 with the `pin 25`en`gaging in one of thekeyways `24; a plurality of keyways being provided merely to permit 'of ready pin-keyway engagement;

After the chuck 15 is in'place in the sleeve the screw `7 is run into such sleeve until initial engagement is had with the inner end of said chuck. Thereafter, with the device properly positioned, the sleeve 1 is rotated by the handles 3 and to cause the exposed threadednd of the stud 28 to relatively screw into the tapped portion 21 of stud by striking the head 9 with a mallet.

one of the handles 3 or 4, and thereafter the screw 7 is run forcefully into the sleeve 1 by manipulation of one or both of the

handles

10 or 11, or by a socket wrench (not shown) engaged in the socket 14; the

handles

10 and 11 being relatively shorter, are rotatable with the head 9 without obstruction by the hand which grasps the outer end portion of one of the handles 3 or 4. This forces the chuck forwardly in the tapered end portion of the sleeve 1, and so that the jaws 18 positively clamp about the stud 28; i. e., such stud is clamped in the chuck 1 against relative rotation.

Thereafter, the radial handles 3 and 4 are grasped, and the chuck assembly-including sleeve 1 and chuck 15-is rotated to unthread the stud 2S from the engine block B, or the like, from which said stud is to be removed. By reason of the fact that the tool can be used to exert a relatively great leverage or turning force on the stud 28, a stud which is initially very tight or stuck can be readily started and removed.

Under certain conditions, as where the stud has mutilated threads, or has broken olf to short threads or length, the tapped bore type of chuck, as shown in Fig. 1, is not readily usable, and under these circumstances I have provided the modified types of chucks shown in Figs. 4-6, inclusive.

In Fig. 4 the chuck 29 is quite similar to the chuck 15 of Figs. 1-3 inclusive, including spring jaws 30. However, the bore 31 of the chuck is not tapped, as before, but rather said bore is formed with a multiplicity of longitudinal serrations 32. When the chuck 29 is used in the described stud puller such chuck, upon contraction thereof, bites firmly into the sides of such stud by reason yof the provision of the serrations 32. This permits the chuck 29 to be effectively and positively clamped on the stud for the purpose of starting and removing the same.

In the embodiment of Figs. 5 and 6 the chuck 33 is much the same in general form as before, except that here the chuck is not split and does not include any spring jaws. In other words the chuck 33 is a non-contracting type and includes a central bore 34; the chuck within the bore being longitudinally fluted, as at 35, the maximum diameter of the bore 34 between the fluting being substantially the tap diameter of the stud to be removed.

The chuck in the embodiment of Figs. 5 and 6 is a driveon type, being first engaged in the sleeve 1, held in place by the lead screw 7, and then driven inwardly onto the When this is done the iiuting 35 cuts into the stud, including any mutilated threads thereon, whereby the chuck is positively locked to said stud for the purpose of removing the latter. In this type of chuck the stud, after its removal from the work-piece, is driven out of the chuck bore 34 by a drive-out rod (not shown) run downwardly through the central bore 27 of the screw 7, and through the corresponding bore portion of the chuck 33.

It is to be noted that while the tool is especially designed for the removal of studs from a work-piece, such tool can also be used, by merely reversing the steps, for the initial placement of a stud.

From the foregoing description it will be readily seen that there has been produced such a device as will substantially fulfill the objects of the invention, as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described the invention, the following is claimed as new and useful, and upon which Letters Patent are desired:

1. A stud puller comprising a sleeve having a tapering forward end portion, a chuck slidable in the sleeve, the forward portion of the chuck matching said taper, said chuck having a central forwardly opening bore therein, means to prevent rotation of the chuck in the sleeve, stud engaging elements on the chuck within said bore, a screw threaded into the sleeve from the rear end, the screw' endabutting the chuck, means on the sleeve to hold the same against or cause rotation thereof, and means on the screw to rotate the same in the sleeve; said chuck bore being longitudinally serrated, and the serrations engaging said stud engaging elements.

2. A stud puller comprising a sleeve having a tapering forward end portion, a chuck slidable in the sleeve, the forward portion of the chuck matching said taper and including spring jaws about a central forwardly opening bore, the latter being tapped with the jaws carrying the tap threads, a longitudinal keyway in the chuck, a pin on and projecting inwardly from the sleeve into the keyway, a screw threaded into the sleeve from the rear end, the screw having a rounded nose on the inner end abutting the adjacent end of the chuck, said adjacent end of the chuck having a concave seat in which the nose engages, enlarged heads on the rear ends of the `sleeve and screw, and handles radiating from said heads.

3. A stud puller comprising a manually rotatable sleeve having an internal tapering forward end portion, a chuck slidable in the sleeve and having substantially matching engagement with said tapering forward end portion thereof, the chuck having a stud-receiving bore in the forward portion thereof and having 4stud-engaging elements therein, and a manually rotatable screw threaded into the sleeve from its rear end and engaging the rear end of the chuck; said screw and chuck having open-ended bores therethrough alined with each other and with the stud-receiving bore of the chuck and opening into the latter to receive a push-out rod.

4. A stud puller comprising a manually rotatable sleeve having an internal tapering forward end portion, a chuck slidable in the sleeve and having substantially matching engagement with said tapering forward end portion thereof, the chuck having a stud-receiving bore in the forward portion thereof and having stud-engaging elements therein, and a manually rotatable screw threaded into the sleeve from its rear end and engaging the rear end of the chuck; the chuck having a longitudinal keyway extending along the chuck to an open termination adjacent the forward end thereof, and a pin fixed in the sleeve and engaging the keyway.

5. A stud puller comprising a manually rotatable sleeve having an internal tapering forward end portion, a chuck slidable in the sleeve and having substantially matching engagement with said tapering forward end portion thereof, the chuck having a stud-receiving bore in the forward portion thereof and having stud-engaging elements therein, and a manually rotatable screw threaded into the sleeve from its rear end and engaging the rear end of the chuck; the forward portion of the chuck being formed as `integral spring jaws disposed about a central forwardly opening stud-receiving bore, and means mounted in the sleeve to advance the chuck to cause said jaws to approach each other at their outer end; the end portions of the chuck substantially fitting the sleeve but said chuck being of reduced diameter for a portion of its length adjacent the plane of the inner end of the spring jaws.

References Cited in the file of this patent UNITED STATES PATENTS