USRE13884E - herzmark - Google Patents

Description

N. HERZMARK. CABLE POP. THB TRANSMISSION 0F MECHANICAL MOVEMENTS.

APPLIGATIOK FILED JAH. 14. 1915. Reissuea Feb. 23, 1915. 1.3 884.

2 SHEETS-SHEET 1`.

HUHH ILIIPI. |11.

N. HERZMARK. CABLE ron THS. TRANSMISSION or MECHANICAL novEnlSNTS.

APPLIOATIOI FILED JAI. 14, 1915. maimed Feb. 2a, 1915. 1 3,884.

2 SHEETS-SHEET 2.

UNrrED. Y PATENT. OFFICE.

income a cum ron 'rnnrnansmssrorr 13,884. original no. 1,049,223, 'ama December To dll 'whom it may concern:

Be it known that I, Nicolas subject of the Emperor of Russia,fan'd a resident of 7 rue de Poliveau, Paris, France, have invented certain new and useful Improvements in and Relating to Cables for the'Tra'nsmission of Mechanical Movements, of which the following is a specification.

The present invention has for its object a ilexible cable for the transmission of mechanical movements of all kinds capable of acting by traction without stretching and by compression without becoming shortened.-

It consists broadly of a core constituted by one or'more wires contained in the interior of a tubular helicoidal winding Awith contiguous spirals, the core being in permanent tension between two stops which bear at each extremity of the cable upon the helicoidal winding. The whole is inclosed in a guide envelop or sheath in which it is able to slide. The permanent tension to which the core is subjected is greater than the maximum tractional effort that the cable has to transmit in use. Consequently, the core does not experience any extension during use because the tractional efforts that it then transmits are vsmaller than those that the extension that it permanently presents have imparted to it. Furthermore, thetransmission of'the compression strains takes place in an exceedingly precise manner; the convolutions of the helicoidal winding are always maintained in compression between the stops to which the core is attached in such a manner that no play can exist between the convolutions. i

4Various constructional forms of the obje'ct of the invention are illustrated by way of Vex'xbll'nple in the accompanying drawing, in which:

Figure 1 is a viewof a fiexible cable with a straight sheath partly in section. Fig. 2 is a view of a flexible cable with a bent sheath partly in section- Figs. 3 and 1 'show' two 'constructional forms, 'of core. Fig. 5 shows a method of'mounting the cable in section. Fig. 6 is a plan view corresponding to Fig. 5- with the fixing plug removed. Fig.` 'I is a lon 'tudinal section of a two-way branch. Fig. 8 is a section on the line in Fig. 7. Figs.V 9 and 10 illustrate diagrammatically the two extreme positions of the branch in Figs. 7 and` 8.

a (Figs. 1 and 2) is the helicoidal winding or Panis, ramen.

or uovma'nn'rs.

engagedat lthe two ends upon the reduced extremity b of rods c' which constitute the stops between which the core d is' stretched. The core d enters a central passage formed in the rods c and is fixed there in any convenient manner such for example as by'so'ldering; e is the guide Ysheath or casing.

play which exists between the windi'n a and the sheath e is insucient to enable t e convolutions to lmove relatvely to each other and to overlap each other. The colhpression strains are transmitted by the intermediary of the helicoidal winding' a which acts in the manner of an incompressible tube and which is nevertheless able tojfollo'w all the desired inflections. The tractional strains are transmitted by the wire or wires which constitutev the core d. The sheath e may be rigid, flexible or perfectly exible.

tion the sheath of which presents 'numeroils bends. Cn pressing the rod c in the direction indicated by the arrow f, the rod c is displaced by the same amount in the direction indicated by the arrow f. On pulling the rod c in the opposite direction, the rod c is caused to renterthe sheath by a Vcorresponding amount. A movement of anykind can tance.

The core d (Figs. 3 and 4) is referably constituted by means of wires o the same nature and section. These wires are grouped in a parallel bundle and arel individually subjected t'o the sametension by any convenient means. firmly tied-by means of a wire d which can be arranged for example in accordance with a regular helicoidal windingas represented in Fig.l 3. In the construction illus'- trated yin Fig. 4, the helicoidal winding d thus be transmitted to any desired disspeciacmon of reissued umarmen. ReissuedFeb. 23, 1915.

31.1912, ser-iai 1ro. .686.539, appagante for reissue mea January u, 191s. smal 1ro. 2,231.

It Amay be Y.

bent at any angles however acute in such'i'f- 175 "In this condition they are jecting it to a tractional strain greater than the maximum strain than it will vhave to withstand in service and its second end is fixed to the second stop o. The preparation of the core in accordance with Figs.

' 3 and 4 serves to bring the wires which constitute it intd identical positions as far as possible, as explained above. Consequently when the core is placed under tension at the time of fitting, these several wires will exactly share the strain and concur to' an equal extent in furnishing the strength of the core. If this precaution were not taken, only a few of the wires of the coi/'e m' ht bear the whole strain while the other Wires would perform no work. p

's Figs. 5 and 6 show a special method of fittingl the cable. The straight `wires of which the core d is constituted are connected with the corresponding rod c in the following manner: The rod c' comprises a central -passage through which the core passes; it is provided at its upper part with a vertical recess c2 enabling the core d to be turned over so as to wind it once vor a larger number of times around the body of the said rod. -fThe core d is then engaged in'a transverse notch la. formed on the outer face of the' part k and is held in this position by a cap la?l screwed on the rod C. It should be noted that the notch h of the/part la. is

` formed in such a manner as to enable the bundle of wires d to be wound around the rod c in the direction indicated by the arrow :11,this arrangement servingto prevent the cap h2 from becoming unscrewed when the cable is actuated by its opposite movement in the direction indicated by the arl row y, because :in these conditions the bundle of wires d has a tendency to displace the said cap h in the direction for screwing it up. The arrangement just described is specially adapted for placing the core in tension at the moment of fitting. One of the extremities of the core (the upper extremity Fig. 5) being fixed, the tubular helicoidal winding is passed over `the c ore d inside the sheath e whereupon the core d is engaged in the rod ,c which constitutes the second extremity of the cable. Then bearing upon the corresponding part h, a tractional effort is exerted upon the core d by any convenient mechanical means which is greater than the maximum tractional strain to which the cable will be subjected in use. The cored is turned down into the vertical recess c2 and wound around therod c while the tension is maintained; the plug h2 is then arranged in place, and fully tightened; the tension mechanism is then released. The core d then tends to shorten but is prevented from doing so by the convolutions of the windings a which are placed in compression so that the core d retains its length. Each extremity of the cable is also provided with a device serving to guide the rod c during its displacement. This device consists of a tube c connected with the rod c and which is engaged with easy friction on the rigid sheath e. The tube e is of suitable dimensions for insuring the guidance of the rod c throughout the entire length of its displacement. The result of the arrangement is to increase the strength of the rod c which can therefore be of very small diameter even in the case of. relatively high strains. Furthermore the tube c forms a casing and prevents the introduction of dust into the sheath. The connection between the tubefc and the rod c may, be effected in any convenient manner, for example by screwing as shown in Fig. 5. It is possible to branch of the control cable coming from a transmitting station, several other cables going in different directions and each ter-4 vcable need only be twice the displacement desired, whatever the. number of parts controlled may be.

Figs. 9 and 10 represent diagrammatically 4 the two extreme positions of this branching device. The rigid rod c in which the operating length A ends is rendered integral with the rigid extremities of the cables B connected with the parts to4 be operated.

This connection is obtained by the intermediary of the guider tubes c arranged parallel one with the other and connected one with the other in any suitable manner, for example by means of hoops g.

As shown in Figs. 7, 9 and 10, the rigid extremities c of each cable B to be actuated are arranged inversely relatively to the rigid extremity of the control cable A and at a distance from this extremity which is equal to `the travel.

In this manner when the `length A is actuated it displaces the len hs B by the intermediary of the rods' c an of the guide tubes c and brings tem into the lposition shown in Fig. 10. It follows from 'such an arrangement that whatever the number of lengths B may be, the system as a whole displacement, a length equal to twice the travel of the controlled parts. In the example illustrated, it has been assumed that `the controlledv lengths B are two in number.

the entire' sys.

only requires for its I The lengths A and B can also be arranged in theKsame direction and the extremities of their rods united one with the other. The olperating cable then works by traction while t e operated cables work by compression and vice versa. This latter arran ement reduced to two branches may be ut1lized as a relay for transforming the tractional movement of a length into a movement of compression of the second length and vice versa.

I claim:

1. In a device for transmitting power, a ilexible core comprising a series of parallel wires, flexible means for securin said wires together, a tubular, helicoidal wmding having contiguous convolutions arranged to surround said core, and a guide sheath forv said tubular helicoidal winding.

2. In a device for transmitting power, a flexible core comprising a series of parallel wires, a flexible member wound around said parallel wires for holding them together, a tubular helicoidal winding disposed about said core and spaced therefrom, said helicoidal winding having contiguous convolutions, and an external guide sheath for said helicoidal winding.

3. In a device for transmitting power, a flexible core comprising a series of parallel wires, a flexible member wound around said parallel Wires for holding them together, a

tubular helicoidal winding disposed about said core and spaced therefrom, said helicoidal winding havin contiguous convolutions, an external gui e sheath for said helicoidal windin and a rigid rod secured to each end of sa1d helicoidal winding and said flexible core.

4. In a device for transmitting power, a Hexible core comprising a series of parallel wires, a flexible member wound around said parallel wires for holding them together, a

tubular helicoidal winding disposed about said core and spaced therefrom said heli. coidal ,winding avin conti ous convolutions, an external gui e sheat for said h'elicoidal winding, a ri 'd rod arranged to enter each end of sai sheath, said rigid rod being hollow, the end of the rod being in enga ement with said helicoidal windin the exible core assing through the rod, and means carried) by the outer end of the rod for securing said flexible core to the rod.

5. A power transmitting cable including a tubular helicoidal winding in permanent compression, and a core therein under permanent tension.

6. A power transmitting cable including a tubular helicoidal winding in permanent compression, and a core therein held under a permanent tension which is superior to the maximum tractional effort required of the cable.

NICOLAS HERZMARK.

Witnesses:

WILLIAM l'. SHocxLnY, HENRY DUcAxn.

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