US1155662A - Clamping device. - Google Patents

Description

W. J. KLEINSTEUBER.

CLAMPING DEVICE.

ATION FILED APPL .1914. 1,155,662. Patented 001:. 5,1915.

Ill/mm 55 4 .nnrrn sin WILLIAM J. KLEINSTEUBER, OF MILWAUKEE, WISCONSIN.

OLAMIING DEVICE.

masses.

Specification of Letters Patent.

Patented Get. 5, 1915.

Application filed August 10, 1914. Serial No. 856,316.

To all whom it may concern.

Be it known that I, VVILLIAM J. KLEIN- srnnenn, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Improvement in Clamping Devices, of which the following is a specification.

This invention relates to improvements in the construction of clamping devices for elements having screw threaded or similarly roughened outer surfaces, and is especially applicable to devices for clamping studs, bolts and the like.

An object of the invention is to provide a clamping device which is simple in construction and eiiicient in operation.

One of the more specific objects is to provide a clamping device especially applicable for clamping and driving studs, bolts and the like, in which clamping of the entire outer surface of the portion of the element being clamped, is effected.

Another object is to provide a clamping device which will efiectively clamp the element without in any way distorting the clamped surface thereof.

It has heretofore been customary in the driving of studs and the like, to use a socketed cap having a screw threaded socket into which one end of the stud was inserted. The socket was provided with a portion adapted to receive a wrench or other implement for the application of power during the driving operation. It has been found with these prior devices, when the thread of the socketed cap became worn so as to loosely fit the end of a standard stud, that upon the application of considerable driving force, the threads of the stud were distorted so as to necessitate re-cutting of the same in order to permit ready application of a standard nut. With the present invention, such distortion of the threads is positively prevented and the stud threads even upon application of the severest driving pressure, are kept in their natural condition. This result is attained by providing a device which produces clamping of the entire surface of the stud thread, and in which an increase in driving force automatically causes a corresponding increase in the clamping pressure on the stud.

A clear conception of an embodiment of the invention may be had by referring tothe drawing accompanying and forming a part of this specification in which like reference characters designate the same or similar parts in the various views.

Figure 1 is a central vertical section through a stud driver showing the clamp mg jaws thereof fully spread. Fig. 2 is a s de elevation of the stud driver, showing a part of the head of the cross bolt broken away. Fig. 3 is an enlarged fragmentary sectional view through the jaws and end plate of a stud driver showing an end of a stud lnserted therein, the jaws being fully separated. Fig. i is an enlarged fragnlentary sectional view through the jaws and end plate of a stud driver showing the end of a stud clamped firmly between the jaws.

The stud driver as illustrated, comprises essentially a clamping member or cylindrical socket 1 having a tapered bore in one end thereof and having a square driving projection 11 at the other end thereof. The clamping jaws or jaw members 2 have tapered outer surfaces which closely fit the tapered bore of the socket 1. The adjacent mid portions of the jaws 2 are screw threaded to receive the end of the element or stud 13 which is to be clamped. The jaws 2 are normally held apart so that a gap 12 exists between the adjacent surfaces of the aws, by means of helical compression spr ngs 8 which are fitted into alined sockets 1n the jaws 2.

The end plate 3 which normally coacts with plane surfaces of the jaws 2, has a zone surface adapted to fit the end of a standard stud, when such stud is screwed lnto position within the jaws 2 preliminarily to driving. The plate 3 is normally held agalnst the plane surfaces of the jaws 2 by means of one or more helical compression springs 9. The opposite end of the compress on spring 9 may re-act against a plate 10 in order to prevent the spring end from entering the gap 12 between the jaws. The cross-bolt 5 closely fits alined bores 1n the jaws 2 and passes through the recesses 4 in the socket 1. The ends of the bolt 5 are provided with antifriction rollers 6 which co-act with cam surfaces formed on the sides of the recesses at. The bolt 5 and jaws 2, as well as the rollers 6, are removable from the device upon removal of the nut 7 which normally holds these elements in place within the socket 1.

In employing the clamping device for i to enter the adjacent threads on the jaws todriving studs, a stud 13 is first screwed into 7 the jaw socket by hand until it assumes the position as indicated in Fig. 3, with the end of the stud eoacting with the Zone surface of the end plate The opposite end of the stud is then started into the threaded hole into which the stud is to be driven, and a wrench or other driving implement is applied to the driving projection 11. Further screwing of the stud 18 into the jaws 2 is prevented by 'means of the spring 9 which augments the friction resisting turning of the stud in the jaws. Upon shifting the clamping socket l angularly, the rollers 6 move along the cam surfaces of the recesses 1 and cause the jaws 2 and socket 1 to move longitudinally relatively to each other,

thereby causing the jaws to approach each other. The relative longitudinal movement of the jaws and socket is effected by the coaction of the bolt 5 with the rollers 6 and with the jaws 2. As the jaws 2 approach each other, the threaded portions thereof approach the adjacent threaded portion of the stud l3 and eventually assume the position indicated in Fig. 4.

In order to permit the threads of the stud their fullest extent, the end plate 3 must be permitted to move in a direction longitudinally of the jaws, the spring 9 resisting such movement of the end plate 3 and being slightly compressed during such movement of the plate 3. It'should be noted that in order to permit such movement of the plate 3 to take place, there must be greater frictional resistance between thejaws 2 and the stud 13 than exists between the jaws 2 and the socket 1. If this is not the case, rotation of the socket 1 will merely cause the jaws 2 to rotate upon the stud, the plate 3 being pushed back in the meantime, compressing the spring 9 until it coacts with the surface of the jaws adjacent the spring side of the plate 3. The amount of frictional resistance between the stud 13 and jaws 2 and between the jaws 2 and socket 1,

may be readily adjusted by the use of.

springs 8, 9, of different strengths. It should also be noted that if the stud 13 is not permitted to move longitudinally rela tive to the jaws 2 during clamping, the threads on the jaws cannot come into engagement with the entire thread surfaces of the stud 13, so that continued application of the stud driving pressure will produce excessive pressure against the ends of the stud threads, thus tending to distort these threads. By permitting the jaws 2 to engage the entire surfaces of the stud threads, distortion of these threads is positively prevented and the threads will readily receive a standard nut upon removal of the stud driver and without necessitating recutting of the threads.

In order to remove the stud driver from the end of the stud, it is necessary onlyto reverse the direction of -'movement of the driving implement, when the rollers 6 will travel along the cam surfacesof the recesses it in a reverse direction and the jaws 2 will move longitudinally relatively to the socket 1 and will be automatically separated by the springs 8. As the studassumes the position indicated in Fig. 3 during unelamping, the end plate 3 isagain restored to-its normal position by the spring 9 and the driver may be readily removed from the stud 13 by hand.

Itwill be noted that anincrease of the driving force will correspondinglyincrease the clamping grip of the jaws 2 upon the stud. The formation of the plate 3.with

a zone surface which fits the corresponding end surface. of a standard stud, will protect the end of the stud against distortion which might otherwise result. VVhile the present disclosure illustrates I a means for causing the jaws to approach consisting of a tapered bore in the socket '1 and correspondingly tapered outer surfaces .of the jaws 2, it is essential only to have some means for causing the jaws 2 to approach parallel to each other in order to secure a firm and uniform grip upon the stud. The V provision of rollers 6 at the ends of the bolt 5 produces an antifriction' means for pulling the jaws 2 into the socket if and will eliminate excessive wear between the parts. It should also be noted that the device while disclosed as a stud driver, may be applied with equal efficiency in a lock nut or other similar device and 'Inay also be applied to clamping devices for spindles which have parallel grooves or ridges instead of screw threads. In any case the means for permitting longitudinal movement of the element being clamped during clamping, are essential in order to insure full contact of the clamping jaws against the adjacent surfaces of the element being clamped. 7

It should be understood that it is not desired to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

It is claimed and desired to secure by Let ters Patent,

1. In a clamping device for screw threaded elements, jaw members having threaded portions engageable with'the element to be clamped, and means for automatically fore ing said jaw members toward the element upon application of rotary force to said forcing means and of rotation opposing resistance to said jaw members. 7 r

2. In a clamping device for screw-threaded elements, jaw membershaving threaded portions,.means for moving said threaded portions transversely of and into engagement with the element, and longitudinally movable means engaging an end of the element for permitting relative longitudinal movement of said element and of said jaws during transverse clamping movement of the latter.

3. In a clamping device for screw threaded elements, jaw members having threaded portions engageable with the element to be clamped, means normally tending to separate said jaw members, and means for auto- 'matically forcing said jaw members laterally against the element upon application of rotary force to said forcing means and of rotation opposing resistance to said jaw members.

4:. In a clamping device for corrugated elements, jaw members having corrugated portions engageable with the element to be clamped, means for forcing said jaw members against the element during clamping, and means engaging an end of the element, said means permitting relative longitudinal movement of the element and of at least one of said jaw members during clamping.

5. In a clamping device for screw-threaded elements, jaw members having threaded portions, a clamping member rotatable relatively to said jaw members to move said threaded portions transversely of and into engagement with the element, and means for permitting relative longitudinal movement of said element and of said jaws during transverse clamping movement of the latter.

6. In a clamping device for corrugated elements, jaw members having corrugated portions engageable with the element to be clamped, means normally tending to separate said jaw members, means for forcing said jaw members against the element during clamping, and means engaging an end of the element, said means permitting relative longitudinal movement of the element and of at least one of said jaw members during clamping.

7. In a clamping device for screw threaded elements, javv'members having threaded portions engageable with the element to be clamped, a clamping member coacting with said jaw members, said clamping member being angularly shiftable relative to said jaw members and said jaw members being surfaces of said jaw members upon applica tion of rotary force to said clamping member and of rotation opposing resistance to said jaw members.

9. In a clamping device for corrugated elements, jaw members having corrugated portions adapted for engagement with the element to be clamped, means for forcing said .jaw members against the element, and means for first preventing and subsequently permitting relative longitudinal movement of the element and of at least one of said jaw members during clamping.

10. In a clamping device for screw-threaded elements, jaw members having wedge surfaces and having threaded portions engageable with the element to be clamped, a clamping member having surfaces engageable with the wedge surfaces of said jaw members, means for automatically forcing said clamping member along the wedge surfaces of said jaw members upon application of rotary force to said clamping member and of rotation opposing resistance to said jaw members, and a spring-pressed movable stop engaging an end of said element for permitting relative longitudinal movement of said jaws and of said element during clamping.

In testimony whereof, the signature of the inventor is afiixed hereto in the presence of two witnesses.

WILLIAM J. KLEINSTEUBER.

Witnesses:

W. H. LIEBER, J. J. KANE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C.

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