US1582340A - Cable clamp - Google Patents

Description

April 27', 1926. I 1,582,340 y`N. G. Ml LN E `CABLE CLAMP Filed Dec. 16, 1925 7 137% fig f f@ E {f} r l I l Il l Il /L I wa R y1,

MMM

Fettented Apr. 27, 1926.

letzen unirse STATES, PATENT orsi-ee.

"WINFORD GLADSTONEIILNE, 0E HAMELTON, OTTABO, CANADA, ASSIGNR TO THE N. SLATER COMEANY, LIMITED, OF HAMILTON, CANADA.

y CABLE Application, filed December To all whom it muy conform.'

Be it known that l, ViliNroiin Ginns'ronn Minne. :i subieet ot the King of Greet' Brituin und u resident of the city ot l'luiniiton, in the county ot' lYentworth, Province ot Ontario, loininion ot' Canards, have invente ed certain neuv undY useful Improvements in. Cable @lumps7 ot which the tfolloniingy is u specitieution. Y

ltly invention relutes to improvements in crible elsinpsend the object otthe. invention is to provide an improved torni ot Clfnnp which will provide un extremely secure und efficient grip Vupon the crible and inY whichA the eoinprssion upon the cable Will be uniiorinly distributed und will ber more truly redini thus eliniiinitirigl inore perfectly` the tendency to distort or crushthe' cable out of its norinel torni; ai Jfurther object is to distribute the compression upon the enbleironi ininiinuni :it the inoutlji of the cle-nip Where the tension in the cae-ble is a. marginiuin to a innxiinuni u, point Where the tensiony in the cable is u mininiuin, e

Other objects will appear in the course. ot the following specification. y

lily intention consists in the constructionv and arrangement of partei all es hereinafter more porticulery described und illustrated in the eccoinpenying drewingsin Whichz-A lfliej. l; is e side View of. a Cuble-olunip ein`T` bodyinginy improved construction showing 'tiro poi-'tions of cable connected thereby;

Fig. 2 is u transverse sectionv (to Ln elilarge d seule) taken on the. lines. 2-2 of Figs. l und 3. n n A lfig. 21 is n. central longitudinul section through l? 'i the section beine` on the line' Sl oi Fig.

In the drawings like elisrecters. of referenre indicate Corresponding` parts in ,the various views. l v

ln the torni illustrated, niy invention coin sis-ts ot' u cable clninp comprisingv it bottoni plete i the central portion of which is de-y elunjip urefindicuted by the nuineruls 5 5` and the portions oi the crible Within the elan'ipere enclosed by u nretullic piece G.v

Opposed side plates 7 ero-.operate With'the bottoni plate andtheiroiiter lateral extrein CLAMP. 16, 1925. serial in. 75366.

ities rest tieelyupon the bottoni plate it 8.

The inner lateral extremities of the side putes 7 nre et trenntesliupe at 9 und the inner conceive portions of these A(trennte portions engage the periphery oit the piece G.

A. keper plate l() is mounted ebove the side plates 7 endflnifs, formed centrally in its under face :t recessli extendinglongitud'inally thereof i i they are spaced spurt longitudinally of the clamp. i

This longitudinal spec-ing of the bolts diminishes troni u inexiniuin et the mouth of the cle-nip et t to aiininin'iuin at Z) adjacent to the inner end ot the cable, the purpose ot which, will be explained hereinif er. t Y

The construction ac-ndQperution of viny iin` proredolainp islas followsz y The. end portions ot each cable 5 to be giipljied'nwithin the eiznnpinuy be enclosed by n strip 6 and for purposesl of description this strip muy be` considered as part of thel cable. Y

The U-bolts are pessed upwardly through the orifices lll inthebottoin-plate 1 sothut the arms of each bolt lie on oppositesides ot' the depression 8. ,n

The cable ends are then plueet'liwithin the depression 8 und the opposed side plates 7' are placed in position with the bolts "extend-r ine through the orifices l5.

The side plates lie in en inclined position With their outer edges resting freely upon the bottoni plete et, 8 and their inner arcuate portions 9 resting upon portions of the periphery of the cable. f

Thekeeper plate 10 is theninounted` so that the bolt arms pass through theorilices 16 therein.

The keeper plete takes a position with the upperfends otheercuate portions 9 lyingv Within the recess 1l in the under fece ofthe keeper plate and the side edges of this recess make line contact with the convex surfaces of the arcuate portions 9 at 12 weich line of cont-act is intermediately of the length of said arcs.

F rom an examination of Fig. 2 it will be noted that the arcuate portions 9 of the opposed side plates 7 are spaced apart to provide a gap c l therebetween and due to the l inclined position of the side plates gaps are provided at (l between the side plates and the bottom plate.

ln tightening down the nuts 1T the first action is to close the opposed side plates down against the bottom plate at 8 `due to the coetiicient of friction at 12. Line contacts are thus made at 8 and 12 and surface contacts of the concave faces of the arcuate portions 9 of the periphery of the strips G which is the same as with the cable. This leaves gaps at c and d.

ln this way the cable is gripped between the arcuate portions 9 andthedepressed portion 3 of the bottom plate.

During further tightening of thenuts 17 the contacts at 12 are fixed except as regards slidingoutwardly upon the flat surface of the bottom plate 1 so that during this further tightening thecontacts 12 slide downwardly oven the convex surfaces of the arcuate portions 9 and the side plates 7 close radially inward upon the cable reducing the gaps at o and d.

Since theorifices 15 in the Vside plates 7 are of somewhat greater diameter than thebolts 13 these side plates have suiiicient freedom of movment upon the bolts to permit this free movement as described.

By so constructing the parts that the straight line joining the center of the bolt hole at the upper face of the keeper plate to the center of the cable passes approximately through thecontact 12, the keeper plate is practically relieved of ben-ding moment tending to bow the sides thereof downwardly.

ln actual test the keeper plate bent upwardly at the sides instead of downwardly would be expected. Y

ln my improved clamp it will thus be seen that practically a truly radial compression is placed upon the cable so that there is not the usual tendency to flatten or distort the cable out of its normal round shape as is ordinarily the case when the com aression is in a transverse direction.

lt is desirable in clamps used on cables carrying tension and particularly in cables made of aluminum that the product of the tensile and compressive load be kept below the flow point of the cable.

Referring now to Fig. 3 the tensile load in the cable at E is 190% or a maximum, while the tensile load in the cable at Z) is zero or a minimum.

lt is therefore desirable that the compression in the cable caused by the clamp be a minimum at the mouth of the clamp and that it gradually increases to a maximum at ab.

This may be accomplished by gradually decreasing the bolt spacing from a to b so that as the tension in the cable decreases the compression increases so that the combined product of the tension by compression is kept below the flow point of the cable material and the compression in the cable at the mouth of the clamp is kept at a minimum value which is desirable.

From the foregoing it will be apparent that l have devised valuable improvements in cable clamps of the class described whereby the objects of my invention have been attained.

Various modifications may be 'made in my invention without departing from the spirit thereof or scope of the claims and therefore the exact forms shown are to be taken as illustrative only and not in a limiting sense and I desire that only such limitations shall be placed thereon as are imposed by the prior art or are specifically set forth in the appended claims.

What l claim as my invention is:

1. In a cable clamp of the class described, the combination with a cable, of a clamp therefor comprising, a bottom plate the central portion of which is depressed to form a longitudinal cable receiving` depression, a keeper plate above the bottom plate and cable, opposed side plates interposed between the bottom plate and keeper plate and each formed with an arcuate portion engaging a portion of the cable periphery, and means co-acting between the bottom plate and keeper plate for forcing the side plates towards the bottom plate to grip the cable between the bottom plate and the arcuate portions of the side plates.

2. In a cable clamp of the class described, the combination with a cable, of a clamp therefor comprising, a bottom plate the ccntral portion of which is depressed to form a longitudinal cable receiving depression, a keeper plate above the bottom pla-te and cable, opposed side plates interposed between the bottom plate and keeper plate and each formed with an arcuate portion engaging a portion of the cable periphery, and means co-acting between the bottom plate and keeper plate for forcing the side plates towards the bottom plate and towards each other to grip the cable between the bottom plate and the arcuate portions of the side plates.

3. In a cable clamp of the class described, the combination with a cable, of a clamp therefor comprising, a bottom plate the central portion of which is depressed to form a longitudinal cable receiving depression,

opposed side plates, the outer lateral extreinities of which rest upon the bottom plate and the inner lateral extremities of which are gaging the under face of said depressed-porfl t) tion of the bottoni plate, and nuts on the extremities of the bolt arms andengaging the upper face of said keeper plate.

el. In a cable clamp of the class described, the combination with the cable, of a clamp therefor comprising, a bottom plate the central portion of which is depressed to Vform a longitudinal cable receiving depression, 0pposed side plates the outer lateral extremities of which freely rest upon the bottom plate and the inner lateral extremities of which are of arcuate shape and are spaced apart, the concave surfaces of said arcuate portions engaging portions of the periphery of the cable, a keeper plate, said keeper plate having line contact with the convex surfaces of said arcuate portions, a U-bolt, the arms of which extend upwardly on either side of the cable through orifices in the bottom plate,

side plates and keeper plate, the orifices in the side plates being of somewhat greater diameter than the U-bolt whereby the side plates have a certain freedom of movement upon said bolt, the central branch of said U-bolt engaging the under face of said depressed portion of the bottom plate, and nuts on the extremities of the bolt arms and engaging the upper face of said keeper plate.

5. In a cable clamp of the class described, the combination with a cable, of a clamp therefor comprising, a bottom plate the central portion of which is depressed to form a longitudinal cable receiving depression, opposed side plates the outer lateral extremities of which freely rest upon the bottom plate vand the inner lateral extremities of which are of arcuate'shape andare spaced apart, the concave surfaces of said arcuate portions engaging portions of the periphery of the cable, a keeper plate having a central longitudiiial recess in its under side, the edges of.

greater diameter than the U-bolt wherebyk the side plates' have a certain freedom of movement upon said bolt, the central branch of said U-bolt engaging the under face of vSaid depressed portion of the bottom plate,

andnuts on the extremities of the bolt arms and engaging the upper face of the keeper plate.

6. In a cable clamp of the class described, the combination with a cable, of, a clamp therefor comprising, a bcttonrplate, the eentral portion of which is depressed to` forni a. longitudinal cable receiving' depression, opposed side plates, the outer lateral leatremities of which freelyy rest upon the bottom plate and theinner lateral extren'ii* tiesof which are of arcuate shape and are spaced'apart', the concave surfaces of lsaid larcuate portions engaging portions ofthe periphery of the cable, a keeper plate, said keeperplate having line contact with the convex surfaces of said arcuate portions intermediately thereof, a U-bolt the arms of which extend upwardly on either side of the cable through orifices in the bottom plate, side plates-and keeper plate, the oriii'ces in the side plates being of somewhat greater diameter than the U-bolt whereby the side plates have a certain freedom of movement upon said bolt, the central branch of the U-bolt engaging the under face of the depressed portion of the bottom plate,

and nuts on the extremities of the bolt arms and engaging the upper face of the keeper yplate,the parts so formed that a straight line joining the center of the bolt at the upper face of the keeper plate and the center Vof the cable approximately passes through the point of contact of the keeper plate with the arcuate portion of the corresponding side plate.

7. In aV cable clamp of the class described, the combination with a cable, of a clamp therefor cOinpiiiSing, a bot-tom plate the central portion' of which is depressed to form a longitudinal cable receiving depression, and the sides of which are bent to form longitudinal stiffening ribs, opposed `side kplates the outer lateral extremities of which freely rest upon the bottom plate and the inner lateral extremities of wliili are of arcuate shape and are spaced apart, the concave surfaces of said arcuate portions engaging portions Vof the periphery ofthe cable, a keeper plate having a central longitudinal recess in its under side, the edges of said recess having line contact with the convex surfaces of said arcuate portions of the side plates intermediately thereof, a U-bolt, the arms of which extend upwardly on either side of the cable through orifices in the bottom plate, side plates and keeper plate, the orifices in the side plates being of somewhat greaterk diameter than the U-bolt wherebyv the side plates have a certain freellt) ies

dom of movement upon said bolt, the cent-ralr branch of'said U-bolt engaging the under face 'of said depressedportion of the bottom plate, and nuts on the extremities of the iso bolt arnis and engaging the upper face of 'he keeper plate.

8. In a Cable elzunp of the oli-iss described, they combination wi'h a Goble of n clamp therefor eon'iprisinpg, u bottoni plate the central portion of which is depressed Co forni :i longitudinal cable receiving depression, opposed sine plaies, ihe outer lateral exireiniiies or whieu rest upon the boton'i plate und the inner lateral extremities of which are of arcuateshnpe, the concave surfaces of Suid arcuate portions engaging portions of 'the peripherj,v7 of the euble, u keeper plate, said keeper plate having line Contact with the convex surfaces of said arcuate portions, a plurality o'l' longi'itudiinill57 spaced apart ij-bolts, the arms or r-:liieh ext @il ufzrrdly on either side of the cable tluough oriloes in lie bottoni pluie, side plates and keeper plate, the eenrrel branches of seid U-bolts engaging the under face of said depressed portion of he botioin plate, the longitudinal Spacing of the bolts gradually ("liniinishing measured inwardly Yfrom the mouth of the clamp.

VVINFORD GLADSTONE MILNE.

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