US1885986A

US1885986A - Bolt-end spinning tool

Info

Publication number: US1885986A
Application number: US561864A
Authority: US
Inventors: Leo M Butler
Original assignee: Boeing Co
Current assignee: Boeing Co
Priority date: 1931-09-09
Filing date: 1931-09-09
Publication date: 1932-11-01
Anticipated expiration: 1949-11-01

Description

Naw', 1932. 1 M. BUTLER BOLT END SPINNING TOOL Filed sept. 9, 1951 l 2 sheets-snee: i

.annual VII Nov' la L. M. BUTLER BOLT END SPINNING TOOL Fild Sept. 9, 1931 2 Sheets-Sheet `2 ...QF 1 -1 TT@ En I. 2 l 2 lllg l// l vil H m M i y l5 (ci {3f/6 l 35 5 5 L m M 'V /7' 1 y v ,ini-ew? M a gmc/nto@ Patented Nov. l, 1932 UNITED STATES) .LEO M. BTLER, OF SEATTLE, WASHINGTON, ASSIGNOR TO BOEING AIRPLAN E COMPANY,

TENT OFFICE OF SEATTLE, WASHINGTON, A CORPORATION OF WASHINGTON 'BOLT-END SPINNING TOOL Application filed September 9, 1931. Serial No. 561,864.

threaded thereon. Itis particularly intended for use in airplane structural work. This application is a continuation in part of my application Serial No. 365,103, filed May 22,

Such an action is essential to the use of bolts in airplane structures to prevent the loosening or loss of nuts, due to vibration of the framework, and it has been common praci tice in connection with some of the bolted structural members, to enlarge the end of the bolt, after the nut has been applied, by the use of a chisel or the like, which splits the end of the bolt, thereby enlarging it to preivent the nut from loosening. This practicer is objectionable, however, since the work is not always perfectly done, and the striking of a blow has a tendency to-bend or displace the lightweight structural members, but especially it cannot tend to tighten the bolt in the nut, nor can it insure that the two are as tight v as they can be drawn.

The principal object of my invention, then, is to provide a tool of this character,

3Q which is of simple, efhcient, durableland inexpensive construction, whereby the enlarging of a bolt end is greatly facilitated, saving time to the operator, and enabling the operationto be performed without the possibility of damage to the structural elements theme selves, and automatically insuring perfect results.

Itis also an object so to arrange such a tool that any tendency of the bolt to turn, due to the spinning action of the tool, will tend to tighten the nut upon the bolt, thereby insuring that the nut, when finally held by the spun down head, will be tightened to its maximum, and that it will not be loosened by the spinning operation, nor be capable of becomingloose later on.

These and other objects will appear as ymy invention is more fully hereinafter described in the following specification, illustrated in the accompanying drawings (in forms which illustrate the principles of my invention) and finally pointed out in the appended claims.

Figure l is a side elevationk of my tool, as a lvovlole, about to be engaged with ay nut and Figure 2 is a view in axial alignment with a bolt, the end of which has been spun down upon the nut threaded thereon.

Figure 3 is a det-ail elevation, with parts in section, showing the preferred formV of such a tool.

Figure 4 is a part section and part elevation of such a tool, taken at right angles to Figure 3.

Figure 5 is an end elevation of the tool shown in Figure 3.

Figure 6 is a view similar to Figure 3 showing a modified form of tool, and Figure 7 is an end view thereof similar to Figure 5.

Figure 8 is a view similar to Figure 3 of a further modified tool, and Figure 9 is an end elevation thereof similar to Figure 5.

Conveniently such a tool may be driven by an electric motor, the casing of which is indicated at 9.

Such a motor is supported upon a slide 90, having a handle 91, and the operation of the tool is controlled by a switch, the handle 92 of which is supported upon or in proximity to the handle 91. Associated with the tool is an anvil member 8 carriedy upon kthe bent arm 80 of a slide 81, which is complemental to the slide 90. To move the two slides relative to one another, any convenient means may be employed, and I have herein shown the slide 8l as provided with ratchet teeth 82 engageable by a ratchet pinion (not shown) controlled by a shaft 93 journaled in the slide 90, and operated by a handle 94. By these, or equivalent means, the anvil member 8 may be drawn with the required degree of force toward the motor 9 and the spinning tool l supported therebelow. This spinning tool, which may take several forms, is supported in a chuck 2, which receives the shank 10 of the tool, and which is rotatable i by the motor 9. Y

The preferred form of the tool is illustrated best in Figure 8. The tool in this form consists of a shaft 1l having a groove 12 (see Figure 4) in its end, within which groove is received the tool proper consisting of the blade 1. The end of this blade is formed to s in down the end of a bolt, rivet, or the 5 l1 e,- with which it is brought into contact while rotatin and this form, as illustrated, includes notV es 3 at opposite sides of the center of the tool, each notch having a groove 14 leading away from it in the surfaces of the blade, but at opposite sides thereof. The shank 10 of such a'tool, which in effect is the uiper end of the shaft 11, is received in the c uck 2, as has been pointed out. This shank may be threaded, as indicated at 15, l5 and lock nuts 16 threaded upon this shank, in cooperation with a sleeve 3, journaled upon the shaft portion 11 of the tool, serve to limit movement of the tool, as will be brought outy hereafter.' A limit collar 17 may also be applied to the outer end of the tool, this being heldin place by a set screw 18, and this serves to prevent separation of the sleeve from the tool shaft.

The sleeve 3 is journaled at one end upon the shaft of the tool, as has been brought out, and at its other end is socketed, as indicated at 3G, to fit closely about a nut 40 upon the end ofthe bolt 4, which is to be spun down. Engagement of the socket with this nut holds l the entire tool in proper axial alignment with the bolt. So en aged, the workman can give his attention so ely to the spinning operatibn, xwithout thought to the proper holding of the tool. Because the position of the limity 85 nuts16 determines the amount of movement ofthe spinning tool relative to the work, he can the tool to the work until it will go nek arther, whereupon he knows that the Spinnin has been properly done, and that 40 the hea 42 yis perfectly formed. This enables'rapid accomplishment of the work, and insures perfect results.

Such sleeves may be changed, to make the tool 4readyfor employment with differently 4e' sized nuts, by removing the collar 17. The

blade, kwhen worn down, can be similarly removed or reforming, and can be replaced by a substitute blade.

The direction of rotation of the tool 1 is such that its tendency to turn the bolt 4 will cause the bolt to be tightened in the nut. Th'ennut is frictionally held to the work, as indicated at 41, and is further held against rotation by the 'engagement therewith of the $5 socket 30, and the engagement of the latter withthe work. The sleeve 3 is journaied on the shaft 11 so freely that the tendency to rotate the nut, caused by rotation of the shaft 11 and tool 1, is slight. An oil hole is indi- 00 cated inthe sleeve at 33 so that this journal bearing can be kept free.

-In Figures 6 and 7 a slightly modified r.'il'rn of tool has been shown. The tool 1 iS formed by grinding away the lower end of the shaft 11 itself. The limit maar 17 In Figures 8 and 9 a further modification is shown. The tool in this instance departs from the blade form heretofore described, and comprises two

rollers

5 and 50 journaled upon a. transverse pin 51, received in a yoke 52 upon the end of the shaft 11. In this form also the shaft 11 is provided with a groove 19, within which is received a spring ring 6, against which one member 61 of a thrust bearing reacts, the other member 62 of this thrust bearing being the backing means against which a compression spring 63 bears. This spring 63 is interposed between the thrust bearing described and a bushing 36 received within the sleeve 8. This bushing also servesthe same function as the collar 17 in the other forms, to limit relative movement between the

tool

5, 50 and the sleeve 3.

By the use of a spring, the sleeve 3 and its socket 30 are yieldingly urged against the work, due to pressure, tending to cause axial movement of the tool itself. Such a spring means may be employed in connec tion with the other forms of the tool, if desired.

It is believed that the operation of the tool will be evident, and it should be borne in mind that the direction of rotation is such as to tend to cause tightening of the bolt with respect to its nut, so that there will never be any tendency to loosen the nut on the bolt. kConsequently the bolt will always be held as tightly as possible.

What I claim as' my invention is z 1. A device for spinning the end of a bolt down, u on a nut threaded thereon, comprisingba s eeve socketed at one end to closely em race the nut, a spinning tool, a tool support therefor, means for rotating the same,

this form is replaced by the through pin the sleeve being rotatively supported from the tool support means to move the tool and its support axially relative to the sleeve, and anvil means applied to the head of the bolt cooperating with the tool support to resist the axial thrust of the tool.

2. A device for spinning the end of a bolt down upon a nut threaded thereon, comprising a sleeve socketed at one end to closely embrace the nut, a spinning tool, a tool support therefor, means for rotating the same, the sleeve being rotatively supported from the tool support, means to move the tool and its support axially relative to the sleeve, and means yieldingly urging the sleeve axially inthe same direction as the tool.

3. A device for spinning the end of a bolt down upon a nut threaded thereon, comprising a sleeve socketed at one end to closely embrace the nut, a spinning tool, a tool support therefor, means for rotating the same, the sleeve being rotatively supported from the tool support, means to move the tool and its support axially relative to the sleeve, the

alY

tool having a thrust bearing associated therewith, and a compression spring interposed between said bearing and the sleeve to yieldingly urge the latter axially in the same direction as the tool.

4. A device for spinning the end of a bolt down upon a nut threaded thereon, comprising a fiat tool having its end shaped to spin down the bolt end, a rotary and axially movable tool support, a sleeve journaled at one end upon the tool and slidable axially therealong, and at its other end formed to closely embrace the nut upon the bolt, and means to rotate the tool and its support in a direction 'tending to tighten the nut upon the bolt.

5. A tool of the class described consisting of a shaft mounted for rotary motion within a sleeve, a spinning tool upon the end of said shaft and adapted for spinning engagement with a bolt end, said sleeve extending beyond said spinning tool and formed into a nut-receiving socket for engagement with a nut on the bolt being dealt with, so that any tendency of the bolt to turn will cause a tightening of the nut, and anvil means applied to the head of the bolt cooperating with the spinning tool to resist the axial thrust ot the tool.

6. A rotary tool for spinning bolt ends and the like, comprising a shaft slotted transversely at its end, and a blade removably received in said slot to positively rotate with said shaft, the end of said blade being formed to spin down a bolt end to which it is applied.

7. A rotary tool for spinning bolt ends and the like, comprising a. shaft, a blade received in the end of said shaft, the end of said blade being notched at opposite sides of its center, and one surface of the blade being plane except as it has a groove extending inward from one of said notches, the opposite surface being plane except aspit has a like groove extending inward from the opposite notch.

8. A bolt-end spinning device comprising a rotary tool, a sleeve journaled by one end upon the shank of said tool, and axially slidable thereon, and its other end extending therebeyond to contact with the work, and limit stops secured upon the tool shank, and engageable with the end of the sleeve to limit movement of the tool towards the work.

9. A bolt-end spinning device comprising a rotary tool, a sleeve journaled by one end upon the shank of said tool, and axially slidable thereon, and its other end extending therebeyond to contact with the work, and limit stops adj ustably threaded upon the tool shank, and engageable with the end of the sleeve to limit movement of the tool towards the work.

10. A bolt-end spinning device comprising a rotary tool, a sleeve journaled by one end upon the shank of said tool, and axially slidable thereon, and its other end extending therebeyond to closely embrace the nut upon