US 1221723 A
Description (OCR text may contain errors)
M. GUICHARD. TELESCOPIC MAST.
APPLICATION FILED OCT- 7 191|.
Patented Apr. 3, 1917.
UNITED STATES PATENT OFFICE.
MARCEL GUICHARD, 0F PARIS, FRANCE, ASSIGNOR T0 SOCIT-DELECTRICIT MORS, 0F PARIS, FRANCE.
To all whom t may concern.'
Be it known that I, MARCEL GUICHARD,
of 7 Bue Duranti, in the city of Paris, Re?
public of France, engineer, have invented a Telescopic Mast, of which the following is a full, clear, and exact description.
The invention has for its object a telescopic mast or post support applicable in all the cases where it is desired to producev or receive electric actions. The apparatus may serve particularly for wireless telegraphy or telephony, for the reception of electric atmospheric actions and for all applications of the same kind.
The existing telescopic post-supports may be classified in two categories.
To the lirst category belong the supports which are previously extended on the ground and set upright afterward.
The tubes which form these supports must be very strong and are consequently rather heavy.
In the second category, the supports are erected vertically, and the tubes need not be as strong as those of the first category.
The support forming the subject-matter of this invention belongs to the second category, but does not comprise any lifting device proper as heretofore employed and its total weight is very slightly superior to that of the tubes. Therefore it presents an important reduction of weight comparatively to all existing supports.
Besides, the support when extended has more rigidity than an ordinary support of equal size and possesses alongitudinal elasticity imparting to the same exceptional qualities as will be specified in detail hereafter.
The new support is substantially characterized by this fact that its elements form a fluidtight capacity of variable volume, in which is sent, when erecting the support, a Huid under pressure.`
By way of example, one method of putting the invention into practice will be described.
In this method each tube forms a tight joint with the tube in which it slides, so that the whole of these tubes forms a tight extensible system in which can be sent the Huid under pressure.
This arrangement is illustrated by way Specification of Letters Patent.
Application led October 7, 1911.
Patented Apr. 3, 1917. Serial No. 653,406.
of example only in the accompanying drawings, in which:
Figure 1 is a section of the extended support;
Fig. 2 is a section showing the support folded;
Fig. 3 is a detail view on an enlarged scale. l
As shown in the drawings, the support comprises tubes a, a1, e2, the number of which may vary, sliding in one another.
The joint between two tubes is formed as shown in Fig. 3; at the bottom of a tube a1 are secured two rings b and o; the outer diameter of the ring b is slightly less than the inner diameter of the tube a for allowing an easy sliding movement.
The tube c carries at its upper part a collar d provided with a ledge e leaving internally a certain play between said ledge and the tube a1.
Between the tubes a and a1 is arranged a short section of tube f which, when erecting the support, abuts against the ring Z) and the ledge e, as illustrated in Fig. 3, this limiting the relative stroke of the tubes a, @1,etc.
In the washer c are fixed two chased pieces of leather g and L which are secured by washers c' and y' tightened by a bolt and a nut. p
The washers c' and are provided with oriiices 7c and Z to allow of communication between the tubes.
The lower tube is closed at its lower end and the upper tube at its upper end. The lower tube is provided at its lower end with a point adapted to enter the ground.
A valve or iiap valve m allows the introduction of the iiuid under pressure.
The support is erected as follows:
The tubes being inthe position shown in Fig. 2, placed vertically, the valve m is connected to an air compression pump or to a compressed air tank. Under the action of the pressure, the elements emerge from one another up to complete or partial development at will.
Stays n, in any suitable number, which may be formed by the post itself, hold the support in its vertical position during and after its erection.
llt sutlices to open the valve m for obtaining the descent or' the tubes and the folding of the support.
instead of using air for erecting the sup port, any compressed gases may be used, for instance liquefied gases; these gases can be contained in a small vessel, situated within the support and opened when the support is to be erected.
In addition te its light weight, the facility of its erection and its adjustable rigidity re sulting trom the inneri pressure, the new support possesses special important advantages due to its longitudinal elasticity.
l. lt frequently happens during the erection of the mast or post or even atter the same has been erected, that the stay wires or ropes forming part ot said post become mixed together under the influence ot the wind or from any other cause; besides, one of said wires or ropes may be broken or it may be necessary to wipe up the rain water or remove frost that may cover the insulators on the mast or post.
1n all these cases, it is necessary to bring down the post and its support in order to have access to the posts to be inspected. 1n all existing post supports it is necessary to put in action for the descent erection devices which are more or less complicated and the operation ot which requires a long time. The support forming the subject matter of this invention allows of bringing down the post and its support to any required extent by a simple traction exerted longitudinally to the support by means of the post wires or ropes, ot the stays or any other ropes connected to the mast.
2. The traction which it is possible to eX- ert on the support in the longitudinal direction moreover allows the tubes to reenter in one another entirely or partially without causing the escape ot the iluid which fills the apparatus.
rlhis advantage allows the reduction of length and consequently the easy transport ot the support, and does not necessitate the introduction ot a iresh quantity of compressed tluid in the support when the support is to be erected over again after the reentrance ot the tubes in one another. 1t simply sutlices to leave at this moment the said support to develop by itself.
3. When the support is provided with post-wires, stays or ropes, held stretched by the erection of this support and it is subjected to undue lateral strains, tor instanceby a gust ot wind, these strains produce a supertension of the post-wires, stays or ropes and a vertical pressure tending to compress the support. This latter stress determines frequently in the other supports the breaking of the parts.
ln the new support, when the preceding action is produced, the tubes enter in one another, thus increasing the inner pressure and consequently the rigidity and at the same time the wind has less hold on the support by the fact that it inclines and is shortened.
llVl'len the length of these wires, stays or ropes vary by reason or the thermic and hygremetric variations of the atmosphere the tubes follow automatically these movements by reason of' their elastic connection. By means ot this device the risks of ruptures of the post-supports and posts which are fre* quently produced by these atmospheric inliuences are avoided.
When the post has been erected and the support suitably developed, the Wires and ropes forming the stays, notwithstanding the atmospheric variations, will with certainty remain constantly stretched in a manner which can be determinedbetorehand.
Li. The present support possesses this advantage that it can be erected at any height and yet preserve its longitudinal elasticity the advantages ot which are indicated above.
This ability allows in particular of mounting in advantageous conditions a post the size and shape of which can vary to infinity, it will thus be possible to mount tor wireless telegraphy or telephony posts 'for sending waves the length ot which may be varied at will.
in a telescopic mast, a plurality of tubes capable of sliding in each other, the upper tube being closed at its upper end and the lower tube being closed at its lower end, means held in the lower ends of the inner tubes and engaging the outer tubes and forming fluid tight joints between the tubes in all positions of the said tubes relative to each other, means connected with the lower tube adjacent its lower end for admitting compressed air to the interior of the mast to extend the same, stays secured to the closed top et the upper tube and adapted to cause the tubes to reenter one another' slightly when the mast is inclined, the lower tube having a flat outer surface at its closed lower end to rest on the ground, and a conical point at said end adapted to enter the ground to permit the mast to incline under wind pressure, short tube sections arranged loosely between the tubes, rings secured on the lower ends of the tubes surrounded by said tube sections, and on which the lower ends of said tube sections rest, the outer diameter of said rings being less than the inner diameter of the outer tubes to permit an easy sliding movement, and collars screwing on the upper ends of the tubes surrounding the tube sections, the said collars having inwardly extending ledges arranged to permit of slight play between the inner tubes and said ledges, the ledges being adapted to be engaged by the upper ends of said tube sections when the mast is extended t0 limit the upward movement of the tubes relative to electromagnetic actions, signed by me this each other, the said tube sections servingio 26th day of September 1911.
maintain the tubes Within each other a su cient distance to insure the rigidity of the MARCEL GUICHARD' mast. Witnesses The foregoing specification of my tele- H. C. COXE, scopic post-support for sending or receiving GEORGES CHARLES COQUET.
Qopiel of this patent may be obtaned for ve cents each, by lddrexsing the Commissioner of Patents,
Washington, D. C.