US1600224A - Clamping strap - Google Patents

Description

Sept. 21 1926.

'G- E. GRUNDY CLAMPING STRAP Filed ,June 28, 1926 ATTURNE';

Patented Sept. 21, 1926.

UNITED STATES PATENT OFFlCE.

GEORGE EDMUND GRUNDY, 0F ELIZABETH, NEW JERSEY, ASSIGNOR TO THE THOMAS & BETTS 00., OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEVJ CLAMPING STRAP.

Application filed June 28, 1826. Serial No. 118,344. 5

This invention relates to a device in the form of a clamping strap, particularly adapted for use in the electrical trade, for clamping Wire conduits, either metallic .or nonmetallic, armored conductors, or non metallic cable, etc.

So far as I am aware, it has been the practice in the past to use straps or clamps which have been formed upon a punch press, or other suitable machine, and which clamps are quite rigid in their construction. Clamps of the kind which I have just described are more or less expensive and bulky, relatively speaking, and not readily carried in a Workmans pocket, in quantity.

It is one of the objects of my invention to provide a clamping strap which is much cheaper to make, and one that is lighter and of such a nature that a large number of them can be packed into a box or package, thereby ralucing transportation expenses, furthermore a large number of them can be very easily carried by a Workman in his ket, so that he will have straps readily at hand to carry on the Work of installing the conduits or cables etc.

Another object of my invention is to pro vide a clamping strap which is adapted to take different sizes of conduits or cables, thereby making the strap a universal one.

Another object of my invention is to pro vide a strap which lends itself to quick and easy installation for all sizes of conduit and cable.

A further object is to provide a strap carrying means which act to lock the strap in position on the surface carrying the conduit or cable and at the same time to lock the strap holding means in fixed position.

These and other objects will be apparent to one skilled in this particular art, after a study of the specification taken in connection with the annexed drawing, wherein:

Figure 1, is a plan view of my clamping strap.

Figure 2, is a side VlQW of. Figure 1.

Figure 3 shows the strap bent over an armored cable ready to drive the clamp hold ing means into final position.

Figure 4- is a view similar to Figure 3 showing the clamp embracing a non-metallic covered cable.

Figure 5, is a section on the line 55 of Figure 4.

Figure 6, is a view showing how the clamps are assembled in packages for shipment or handling. I. Figure 7, is a view showing a modified rorm o't clamp.

Figure 8 shows one wa 0% u clamps in practice, whereb a. number clamps are initially surface to which the (31 previous to laying the .Oidldit or cable in position, the latter being shown in dotted lines. 7

Referring; now to t numbers refer lizing the of the 1e details, wherein like to col-re ingparts in the varioijis Views, 1 is a c f relatively thin metal, prcferal eel, so that the same may he ie I by the lingers the operator. In. ore c oi. the chimp 1, 1s a hole 2, and in the ouier end a series of indentations 3. The hoic 2, is adapted to receive clamp SGCGJ'lUP means e'i, which ma'v be a 6d. or other co en nail. Preferably the hole is large enough to provide clear ance for the nail i As shown in Fi urc 3. the clamp 1, is bent around a steel .iored conduit 5. earl-vin the usual (*OlKlilCiOrS ii and T, insulated 2; well-known manner.

In attaching the armored cable 5, to a wood surfare such as the fran'iework of abuilding, the strap 1, is of such a character that it can be p ickly bout with the fingers around the cable and the nail 4-. k

inserted surface 8.

it wiil be apparent that in the act of periterating the indentations nail 4t, throu h. tl' .tthe e tation will act as wed -.p into the nail 4,, to prevent the sa. e from being: readilv withdrawn or shaken loose. In addition to the indentat ons I may also use a supplemental indentation 9 as shown in Figures iand 5. A

In Figure 7. the strap 1, is shown with av d pressed portion 10, and the indentations are termed downwardly from the depression 10. thereby giving; a modified form of gripping surface for the end of the strap.

Figure 8, shows a plurality of straps 1,

y driving the of the inden- 'uicil on the which may lje applied. to the need support 8, previous to laying the conduit or con ductor in position. and quickly done by l the member 8, am e a indentations with a hammer, pressing these into the Wood that 1 number of straps are thus held in place, the conduit 0 i nd the cable can be ti on aid end ha 'ing a hole 2, j the conduit or cable, and home as above descr'ael.

Figure 6, shows ho? the straps fsembled for shipment pr r oses, or for the use of the operator. bundle of of these occupy an extremely snrall space and therefore a large number of he straps may be any inconvenience; of course, it is obvious that the size of the packages may be variec to suit conditions.

From what has been SElC my invention will be rea ily appreciated M 1 .in

and understood WlbllOlLi .Ll. inter description.

li aving thus described my invention,

what i 1. Ir crevice of th prising a relatively adapted to be bent by han i: to be clamped, one end .35. v a hole the em and th t 'p having a plurality t: tions or engaging the surface to which the onecfi is to b fastened, said indentations ig'r t led by member driven theret driven member being gri )ped the perforated bile substanthe purpose des ihee.

the class descrio d, comstrip hav- 'elv thin metallic one end oi. indentation;

iii n," into a supporting or mber,

sale strip adapted to be readily l ent by the ope ator. over an object to be clamped, said intlentatiins being adapted to selectively pcrtaratec. by a member driven therethr ugh and passing through the opposite bent-over-end of the strip, r

' iereby the object is securely held by the strip. Means for clampin an electr l cable, compris a norn all llltlLlllC strip =1Yl11fi an opening in one end and a plurali v or indentations at the other end. sa'd strip being readily formed by hand into loop over the cable, saic loop being drawn into engagement with the cable and fastened to a support by a men b r driven through said opening in the strip and through one of the selected indentations, substantially as described.

-l. Means for clamping an electrical cable, comprising; a normally flat metallic strip having an opening in one end, and a ph rality of index tations at the other end, said strip adapted to be temporarily attached to a support member by a blow on the strip over the indentations. said stri) eing readily bent over the cable after it is put into position over the strip, and a member driven hrough said opening and a selected one of the indentations into the support.

:3. Clamping means for an electr'cal cable comprising; a flat metallic membe' adapted to be bent into a loop by hand over the cable and a member passing through both ends of the loop alongside the cable into a supp rt, raid member being forcibly driven through the strip and gripped by the meta around the edge of the hole broken through strip at least at one end 0' the loop sub- :itiall as and for the purpose described.

A. clamping strap comprising a strip of n'retal bendable by hand around the objectto be clan'ipcd having a clearance opening in one ent. and a plurality of indentations at the other end, said strap being held in position by a member passing through the opening and driven through a selected one of said perforations into a support.

As an article of manufacture, a clamp ing strap for an electrical cable comprising; a that st 'ip of meta]. adapted to be stacked into a compact bundle for shipment and handling: each of said strips having a open- 'ug in one end and gripping indentations at the other end, each of said strips being readily bendable by hand into a l op over the cable and held in position by a nail driven through the opening and one of said indentations.

S. A universal electrical cable st ap comn'ising; a normally flat strip of metal easily bendable by hand over the cable, said strap iaving an opening in one end and a plural of indentations longitudinally spaced rem the other end, said indentations being such that a nail positioned in said opening, may be readily driven through a selected indentation depending on the diameter of the cable, into a support to draw the ends of the strap together over the cable.

In testimony whereof, I aliix my signature.

GEORGE EDMUND GRUNDY.

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