US2900169A

US2900169A - Bolt puller

Info

Publication number: US2900169A
Application number: US451901A
Authority: US
Inventors: Herman E White
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-08-24
Filing date: 1954-08-24
Publication date: 1959-08-18
Anticipated expiration: 1976-08-18

Description

Aug. ,18, 1959 H, wHlTE 2,900,169

BOLT FULLER Filed Aug. 24, 1954 2 Sheets-Sheet 1 Herman E. White IN VEN TOR.

H. E; wHm 2,900,169

' BOLT FULLER Aug. 18, 1959 2 Sheets-Sheet 2 h'rman E. White I Filed Aug. 24, 1954 INVENTOR.

BY v udbmvfim Unite This invention relates in general to new and useful improvements in pulling implements, and more specifically to a novel bolt puller.

There are numerous places where once a bolt has been set and it is desired to remove it after a period of time, the bolt is stuck in the aperture through which it passes either because of rusting of the bolt or the swelling of the material through which the bolt is passed. When this happens, the bolt normally may be moved only by placing a bar under the head of the bolt and attempting to pry it loose or by taking a driftpin and driving on the nut end of the bolt in an attempt to drive it back through its aperture. Both of these methods are time consuming, and many times, when a bolt is securely stuck, it is virtually impossible to remove the bolt. An example of this is in the ship building field where planks are secured to the frame of wooden ships by bolts, and it is desired to renew the planking of boats. When this happens, it is necessary to pull the bolts out in order that new planking and new bolts may be installed.

It is therefore the primary object of this invention to provide an improved bolt puller which is so constructed whereby it may be engaged with a bolt and remove such bolt through a simple operation.

Another object of this invention is to provide an improved bolt puller which is so constructed whereby a power driver may be connected thereto for the automatic operation thereof in conjunction with the power driver.

Another object of this invention is to provide an improved bolt puller which includes a collet for engaging a bolt, the collet being so constructed whereby collet blades removably attached thereto are adapted to properly seat with respect to bolts of various sizes.

A further object of this invention is to provide an improved bolt puller which includes a barrel adapted to engage the surface from which a bolt is being pulled, the barrel being provided with a sight opening therein to accurately gauge the distance the collet engaging the bolt has moved through the barrel so as to prevent jamming of the collet within the barrel and breaking of the bolt puller.

A still further object of this invention is to provide an improved bolt puller which includes a threaded shaft having attached thereto a collet for engaging a bolt head and a nut threadedly engaged on the shaft for urging the shaft through a barrel in the bolt puller, the nut being in the form of an elongated sleeve intended to receive the threaded portion of the bolt, the sleeve having packed therein lubricant for lubricating the threads of the shaft.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure l is a perspective view of the bolt puller which is the subject of this invention and shows the same engaged by a driving head and shows the collet of the bolt puller in an initial bolt engaging position, the bolt being broken away;

States Patent Patented Aug. 18, 1959 ECQ Figure 2 is a longitudinal vertical sectional view taken through the bolt puller of Figure 1 on an enlarged scale and shows the specific details of the construction of the bolt puller;

, Figure 3 is an enlarged transverse vertical sectional View taken substantially upon the plane indicated by the section line 3-3 of Figure 2 and shows the manner in which a key strip is secured to the inner surface of the barrel of the bolt puller by frangible fasteners, also being shown are the fasteners for securing a cover to one end of the barrel and the sight openings in the barrel;

Figure 4 is an enlarged transverse vertical sectional view taken substantially upon the plane indicated by the section line 44 of Figure 2 and shows the internal construction of the collet;

Figure 5 is an enlarged fragmentary vertical sectional view similar to Figure 4 and shows the collet provided with a collet blade seated in the bolt head receiving socket of the collet, the collet blade receiving a smaller size bolt; and

Figure 6 is an enlarged exploded perspective view of the collet and the collet blade.

Referring now to the drawings in detail, it will be seen that there is illustrated the bolt puller which is the subject of this invention, the bolt puller being referred to in general by the reference numeral 10. The bolt puller 10.includes an elongated barrel 12 which is provided at one end thereof with an enlarged Work engaging seat 14. 7

.As is best illustrated in Figure 2, passing through the barrel 12 is an elongated externally threaded shaft 16. The shaft 16 is provided adjacent one end thereof with an unthreaded portion 18 and a relatively short threaded portion 20. Engaged on the short threaded portion 20 is a collet which is referred to in general by the reference numeral 22. The collet 22 is formed in such a manner so as to be engageable with the bolt head in the manner to be described in more detail hereinafter.

The end of the barrel 12 remote from the work engaging seat 14 is provided with a plug 24 having a longitudinal opening 26 therethrough receiving the shaft 16. The shaft 16 passes through the opening 26 and has engaged on the end thereof remote from the collet 22 a nut which is referred to in general by the reference numeral 28.

As is best illustrated in Figure 1, the nut 28 is in the form of an elongated sleeve. The nut or elongated sleeve 28 is provided at the end thereof remote from the barrel 12 with an enlarged polygonal cross-sectional socket engaging portion 30 which may be releasably engaged by a socket 32 of a power driver 34.

As is best illustrated in Figure 2, the nut 28 is pro vided at the opposite end of the sleeve portion thereof with a part 36 having thickened walls. The part 36 is tapered so as to be of a reduced size and has an internally threaded bore 38 therethrough. The bore 38 is coaxial with the axis of the sleeve portion of the nut 28, but is smaller than the bore of the sleeve portion. Because of the differential in diameters of the bores of the sleeve portion and the internally threaded bore 38, suitable lubricant may be stored within the nut 28 to properly lubricate the threads of the threaded shaft 16.

The plug 24 is provided with a projecting end portion 40 of reduced diameter. Seated on the plug 24 and engaging the end portion 40 is a thrust bearing 42. The thrust bearing 42 has seated thereagainst a collar 44 which is, in turn, engaged by the end portion 36 of the nut 28.

In order to provide a proper seal for the thrust bearing 42, there is provided a cap-like cover 46. The cover 46 includes a body portion 48 telescoped over the end of the barrel 12 and removably secured thereto by suitable 3 fasteners 50, as is best illustrated in Figure 3. The cover 46 also includes an end wall 52 which retains the collar 44 in place. The end wall 52 has a central opening 54 therethrough through which passes the nut 28, as is best illustrated in Figure 2.

In order to prevent relative rotation of the shaft 16 and the collar 20 with respect to the barrel 12 during a bolt removing operation, the collet 22 is provided with a longitudinal keyway 56, as is best illustrated in Figure 4. Also, the barrel 12 is provided on the inner side thereof with an elongated key strip 58. The key strip 58 is'sein an end of the collet 22.

mitted to rotate so as to permit rotation of the collet 22 and the shaft 16.

Inasmuch as the collet 22 would jam against the plug 24 if the nut 28 were continued to be threaded down on the shaft 16, there is provided a plurality of elongated, circumferentially spaced sight openings 62 in the barrel 12 adjacent the plug 24. By viewing through these sight openings 62, the advance of the collet 22 to the left, as viewed in Figure 2, may be seen, and the electric driver 34 may be shut down before the.collet 22 engages the plug 24 and causes damage to the bolt puller 10.

As is best illustrated in Figure 6, the collet 22 is in the form of an elongated circular cross-sectional member 64. The member 64 is provided with an internally threaded bore 66 in which is receivedthe threaded end portion of the shaft 16. Formed in the opposite end of the body 64 is a bolt receiving socket which is referred to in general by the reference numeral 68. The socket 68 includes a transverse slot 70 whose crosssection is best illustrated in Figure 4. Communicating with the slot 70 is a longitudinal slot 72 which opens both through the end of the body 64 remote from the bore 66 and through the longitudinal surface of the body 64 opposite from the keyway 56 formed therein.

When it is desired to remove a bolt, such as the bolt 74, the collet 22 is engaged with the bolt 74 insuch a manner that the shank of the bolt 74 passes through the longitudinal slot 72 and the head of the bolt 74 is received in the transverse slot 78 and bears against a transverse wall thereof remote from the bore 66, as is best illustrated in Figure 2.

When the collet 22 has been properly set with respect to the bolt 74, the nut 28 is rotated through the use of the power driver 34 until the collet 22 has moved into the barrel 12 and the seat 14 of the barrel 12 is engaged with the work surface throughwhich the bolt 74 passes. With one operator holding onto handles 76 of the barrel 12, the other operator manipulates the electric driver 34 to continue to rotate the nut 28-with the result that the collar 22 and the bolt 74 are pulled into the barrel .12. Thisis continued until either the bolt 74-is removed or thecollet 22 approaches the plug 24. If the bolt 74 is of such a'length so as not to be pulled upon the first turning down of the nut 28 on the shaft '16, the nut 28 is turned in an opposite direction by-reversing the power driver 34 and the barrel .12 is pulledaway from the work surface. Then a U-shaped lock (not shown) is placed between the seat 14 and the work surface, and the operation repeated until such time as the-bolt 74 has been entirely withdrawn. The nut 28 may then again be blades, such as the collet blades 78 best illustrated in Figures 5 and 6. The collet blade 78 is formed of a generallyrectangular plate '80 having a slot 82 opening through one end thereof. The slot 82 aligns with the longitudinal slot 72 in the collet 22, but is of a lesser width than the slot 72 so as to receive a bolt of a smaller size than the bolt 74. The collet blade 78 is provided in the end portion thereof remote from the slot 82 with an internally threaded bore 84. When used, the collet blade 78 is positioned in the slot 70 against the end of the body 64 and the bore 84 is aligned with a bore 86 A fastener 88 is then seated in:the bore 86 and threadedly engaged in the internally threaded bore '84 to clamp the collet blade 78 in place, as isbest illustrated in Figure '5.

Although. only one collet blade 78 hasheenillustrated, itis' tobe .understood that there is to be a plurality of such collet blades so that the collet 22 may be utilizediin pulling bolts of various sizes.

Although the invention has been illustrated and described with respect to bolts, it is to be understood that it maybe utilized for pulling any'type of headed member which may be stuck in an opening. However, itjis to be realized that the design of the collet may have to be varied to be adapted to the particular type article being withdrawn.

From the foregoing, the construction and operation of the device willbe readily understood and further explanation is believed to be unnecessary. However, since numerousmo'difications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within thescope of the appended claims.

What is claimed as new is as follows:

1. A bolt puller for use with a mechanical driver, said bolt puller comprisingan elongated barrel having a work engaging seat at one end thereof, an elongated threaded shaft extending through said barrel and out of the end opposite to said one end, a collet disposed in said one end and carried by .said shaft, a nut on said shaft seated relative to said opposite end to move. said shaft and collet through said barrel in response to rotation of said nut, a bolt head receiving socket formed in said collet, a thrust hearing at said opposite end, said nut engaging said thrustbearing, said nut being elongated and tubular to form a lubricant container, a lubricant shield forming cover removably carried by said barrel enclosing said thrust bearing, an opening in said cover receiving said nut.

2. A bolt puller comprising an elongated barrel hav- 7 ing a work engaging seat at one end thereof, an elon reversed, and the .collet 22 moved to the position illustratedin Figure 1 for the releasing of the bolt 74.

From the foregoing description of the collet 22, it is readily apparent that because of extreme pressures-applied to the bolt 74, the collet.22, as illustrated and described,

gatedthreaded shaft extending throughsaid barrel and out of the .end opposite to said one end, a colletdisposed in said one end and carried by said shaft, a nut on said shaft seated relative to. said opposite end to move said shaft ,and .collet through said barrel in response to rotation of said nut, a bolt headreceiving socket formed in said collet, and a replaceable adapter collet blade seated in said socket, a fastener releasably securing said collet blade to said collet, said collet blade having a reduced boltshank receiving opening aligned with said socket.

References Cited in the file of this patent UNITED STATES PATENTS 401,113 Baumeister Apr. 9, 1889 728,096 Giltner May 12, 1903 1,155,721 Golly Oct. 5, 1915 1,519,308 Hood Dec. 16, 1924 1,544,393 Hatcher et al June 30, 1925 1,873,294 Cosgrove Aug. 23, 1932 2,452,457 Gray et al. Oct. 26, 1948 2,639,887 Henry May 26, 1953