US2390545A

US2390545A - Inserting tool for tangless inserts

Info

Publication number: US2390545A
Application number: US555469A
Authority: US
Inventors: Eugene M Lang
Original assignee: AIRCRAFT SCREW PROD CO
Current assignee: AIRCRAFT SCREW PROD CO; AIRCRAFT SCREW PRODUCTS COMPANY Inc
Priority date: 1944-09-23
Filing date: 1944-09-23
Publication date: 1945-12-11
Anticipated expiration: 1962-12-11

Description

Dec. 11, 1945. EM. LANG INSER'IING TOOL FOR TANGLESS INSERTS Filed Sept. 25, 1944 l N VEN TOR.

:EUGENE M. LANG BY Ma 5". m

Patented Dec. 11, 1945 um'nzo STATE s PATENT" OFFICE INSEKTING TOOL FOR TANGLESS INSERTS Eugene M. Lang, New York, N. Y., assignor to Aircraft Screw Products Company, Inc., Long Island City, N. Y., a corporation of New York.

Application September 23, 1944, Serial No. 555,469 H g 6 Claims.

.The invention relates to a tool for contracting wire coils such as for instance serve a thread inserts for-tapped holes. The tool according to the invention is, in particular, intended for usewith wire coils provided with a recess in the inner portion of one of the coil ends e. g, to coils of the In certain instances of the application of wire coils to tappedholes it is necessary to contract the coil priorto inserting it, and to keep the coil "contracted during the insertion. A tool for such purpose in connection with coils provided with a diametrical tang 'of one end convolution is described in U. S. Patent2,316,231 to Evans of April 13, 1943. It is another object of the presentinvention to combine certain features of such tool with new means to render the tool useful for application to tangless coils with a recessed end convolution.

Further objects and details of the invention will beappar'ent from the description given hereinafter and the accompanying drawing illustrating an embodiment thereof by way of example.

In the drawing: i M Fig. 1 is a front elevation of a coil of the type for which the tool is destined;

* Fig. 2 is a side elevation, partly in section of an embodiment of the invention;

Fig. 3 is afront elevation thereof;

Fig. 4 is a side elevationof the tool in combina tion with a prewinder device shown in section.

mReferring now to the drawing, the tool accordin to the invention comprises a substantially rod-shaped element It with means such as a grip ll whereby a torque can be applied thereto. The forward end portion I! has a diameter according to the inner diameter a coil [3, to which the tool I is to be applied, will have when in its contracted state. That means the diameter of the portion 12 issomewh'at smaller than the inner coil diameter prior to the application of the tool. The portion it is longitudinally slotted at It so that two prongs l 5 and 16 are formed of suflicient resiliency to allow for compression of the prong ends without undue resistance. It is of course possible and, depending on the size of :the tool, it may evenxbe advisable to provide more slots than shown so as to form a larger number of prongs of the desired resiliency and yield. One of the pron s, i. e. prong l5 of Fig. 2, has a lateral pro- J'ection l'l near th free prong end. The projection is so shaped that it will fit into arecess 18 in the inner portion of an end convolutionof In order to facilitate the insertion of the tool and simultaneously cause the compression of the prongs, the ends l9 and 20 of the latter are tapered, and the taper of the prong I9 is preferably continued in the front face 2| of the projection l1. Thus, if the tool is pushed in axial direction into the coil, the prongs will be auto matically compressed, until the projection H V springs into the recess 18 when the projection has cleared the convolution 22 adjacent the recess. Should the projection H be out of registry with the recess 18, the coil-may be turned relatively to the tool or vice versa until engagement is accomplished. when the tool is to be removed after the insertion of the coil in a tapped hole, it is only necessary to pull the tool backward in axial direction whereupon co-action of the rear face 23 of the projection I! with the convolution 22 will cause a compression of the prongs to. permit the withdrawal. For this purpose it is advisable to shape the rear flank 23 of the projection according to the inner flank of the coil convolution 22 or to taper it. It is also advisable to make the projection l1 slightly longer than. the pitch of the coil in order to prevent it from entering between two adjacent coil convolutions during th'e axial movement of the tool. However, if the depth of the hole into which the coil is to be inserted does not permit the use of a tool appreciably projecting from the recessed coil end, a shorter length of the projection l1 maybe selected, Theonly-disadvantage in thatevent will be that the prongs will be repeatedly compressed and slightly released during the insertion of the l8. For this purpose a stop collar 24, is provided so as to freely shift on the portion' li-oi thetool in axial direction, and a compression springhifi pert-ion of a coil 13.

is arranged between an abutment on portion 12 and collar 24 so that the latter is located between the spring and the projection IT. The abutment may be integral with the tool body. However, in order to make the tool applicable to coils of different lengths it is preferred to form the abutment as a second collar or ring 26 adjustable in axial direction and,to,provide it withimeans such as set screw 27 whereby the collar 26 may be secured to the tool in an adjusted position. Now

in its application, the tool portion I2 may be pushed through the coil sofanthat the projection I1 is entirely in front of the recessed coil end while collar 24 bears against -theicthercoil end and spring 25 is compressed. If,; ;th en,-=thetool is permitted to shift relativelyto-the coil in axial direction, the spring 25 will! cause gtheweariface 23 of the projection I1 to contact the recessed coil end and engagement of the projection and sine re es n be s m lishgd r r rning th tool relatiyely-toathe ccil if such-turning; is neces- Q 125 tp cause .therparts to register. In orderto re correctropfiration pfftn tool, the spring oul d so selected and dimensioned, that ring is still slightly compressed when the A d: coil are; in-the. engagedmozition of Fig. 1. 2. force,;hogweyer,shouldnot-be sufficient gli retract-the tcol bsyond that position inwhich the 11ear face of *the projection ,bears against fiankrof the convolution 22. It will .beclear :iBh-at the s rin son he r ad y a ius o this inurposeb s i t ns .snlla 1: am securinsi fin a nrone pos tioa l i; v

The 6001 ,hs e be nre de r ed ma e :d eng ned for open on d or ;as part of a i h possibl t @Qmb e i thzct r to ls s crr t qe t e p wi e shown-mi itan- Th r winde com s sw ain llyitubular bod tfifiiipne en pq tipn 3141 is-1in 1ri r t eade a a or to r the mater shape, diameter and pitchto which the ,coil :13 isatozbe contracted. @[Eheportionfid adjarcenttheportionjl {has an inner diameteraccord- -.to the outendiameterpf {the coil prior to its being-contracted, and portion 33 is laterally rece sedatzsiilsothatia 091 may be-cha edinto :it. The other .end portion 1 35 is provided with means imherebyiitican be held stationary. 1s the tool is destined for 'hand operation .it may' b knurled as shown at :36, :or if it is P31117501. aimachjne tool thememberzfl may be part of or attachedto the stationary machine structure. The inner diameter "of'the' portion :35 and the :outer diameter of the-portion it!) of the toolidescribed-withreference to Fig. '2', and denoted ingeneral by 3'! in Fig. 4,

are such that the tool :31 can :be freely shifted and turned within member 30. Also, the collars ll-il'and"fit-trick! the spring .2- are so dimensioned that the tool 311 can be projected with'its pronged end -forward' of the member portion Bil at least a distance equal to the length of the coil to which the-tool is to be applied. Onthe other hand, the tool 31 with the collars and the spring thereon, has, be retractable so as to clear the portion s3 sumciently to permit thech-arging-of the coil into mer'n-ber 39. The tool 3 connection with the prewinder may be designed for hand operation, as herebefore described or it may be adapted for connection to a machine part which :is rotatable and-airially shiftable.

- in applying the combined tool the part a! is first retracted to clear the portion 33 for the in- While the latter bears against the threaded portion 3|, the part 31 is to be pushed through the coil, and the projection I! caused to engage the coil recess, as hereinbefore described. When in this position the coil may be screwed through the prewinder threading 32 so as to be contracted.

It will be apparent to those skilled in the art that many alterations and modifications of the tool. described and illustratedv are;,possible within the spirit and essence of theinven'tion which shall be limited, therefore, only by the scope of he appended claims.

I claim:

l. A tool of the type described for contracting a -wire coil, comprising a rod-like member includa 'ferward gripping end substantially of a diameter according to the inner diameter to whichsaid coi-lis to be contracted, said forward end being longitudinally slitted so as to form resilient prongs, one of said prongs including, near its forwardend, alateral projection adapted to engage a ,recessin the inner side ofran end convolution of the .coil the :tool ,is intended .to contract-and the free forward ends of said prongs being-slightly tapered on their 'outsides somthat upon insertion of the tool into-said-coil-fromthe nonrecessed end of the la-ttersaid pron-gs will be compressed, and-said projection-when haying passed the coil convolution adjacent the recessed coil end may spring into said recess.

2. [A tool-' as claimed in claim 1, wherein the .rear end of said 3 projection is shaped according -3to=theilank of the innerportion of arconvolution nw ool as claimed in rclaim wherein rthe rear e d of said p o ection is tap r d.

A. Atpol as claimed in claim '-1,:fu:1ther "comprising a compression spring on :said slittedzm tion of said member and bearing with :its :rear end against an abutment thereof. and a sli-dable collar intermediate said spring and said projection andadapted 2150 "bear against :the .rnonsrelcessed coil e fd under the "action- -of said spring.

5. A tool as claimed in claim :1, further zoomprising an axially adjustable collar onrs'aidrmemper, a nomnressionisprin surroundmgsaidimemher and hearing-with :its rear end :against :said c llar. and a Second collar zfreely shiftable am said slitted member portion and intermediate said spring and said projection;

6. -In a tool of the type described fora'contracting a wire coil and "including a rfirst' substantially tubular member adapted to receive therein a coil to be contracted, the'combina'tion of a second member rotatable and "axially shiftable in an axial 'directi'onzinteriorly "of said-first member, said second "member including a forward .end substantially of a diameter according to the inner diameter to "which said coil is to be contracted, said forward end being longitudinally slitted so'as to form resilient prongs, one of said prongs including, near its forward and, alateral projection adapted-t0 en agea-i'ecess-in the inner side of an end convolution of said coil, a compression spring .on said member and .bearing with its-rear end against an abutment :thereof, and a slidable collar i'intermediate said spring and said projection and adapted to :bear against the non-recessed coil end .under the action of said spring, said coil and said collar :being'nf such outer diameters as to pass through the inte ior of said first member.