Abstract:
A device for locking two elongated elements the first of which slides in the second telescopically, comprises members ( 12, 22 ) for locking the first element ( 2 ) longitudinally relative to the second element ( 4 ), a lock washer ( 13 ) arranged around the first element and whereof the circumferential part is placed between two longitudinally opposite supports of the second element and an elastic return member ( 18 ) placed between the second element and the washer and acting on the washer in a site at some distance from the supports so as to bring the lock washer in an extreme inclined position relative to the first element wherein the two opposite parts of the washer are in contact with the first element so as to lock the first element ( 2 ) relative to the second element ( 4 ) in the longitudinal direction.

Description:
FIELD OF INVENTION 
   The present invention relates to a device for locking two elongate elements, a first of which slides in a second telescopically. 
   BACKGROUND OF THE INVENTION 
   To lock two telescopic elements in a given longitudinal position it is known practice for the end of the outer element to be provided with a conical ring with longitudinal slots and with a nut so as to squeeze this split ring and press it against the inner element. 
   Patent FR-A-2 768 200 also discloses how to immobilize two telescopic elongate elements in one direction by cutting the end of the outer element at an angle and arranging around the inner element a washer which, when it bears against the end of the chamfer, adopts an inclination and locks the inner element in the direction of pushing it into the outer element. 
   SUMMARY OF THE INVENTION 
   The object of the present invention is to propose a better device for locking two telescopic elements. 
   The device for locking two elongate elements, a first of which slides in a second telescopically, that is the subject of the present invention, comprises means for locking the first element in a first longitudinal direction with respect to the second element, which means comprise a washer arranged around the first element and a circumferential part of which is placed between two longitudinally opposed supports of said second element and an elastic return member placed between said second element and said washer and acting in said longitudinal direction on the washer at a point distant from said supports so as to bring the washer into an extreme inclined position with respect to the first element, in which position two opposed parts of this washer are in contact with the first element so as to lock the first element with respect to the second element in said longitudinal direction. 
   The locking device according to the invention also comprises a tilting member articulated to said second element, a spacing member placed between the washer and the tilting member and an operating member allowing action on the tilting member so that action on this operating member causes the tilting member to tilt, which tilting member, via the spacing member acts on the washer in such a way as to move it away from its aforementioned extreme position against the action of said return means, reducing its inclination, so as to release the first element with respect to the second element. 
   According to a preferred embodiment of the present invention, the locking device comprises second means for locking the first element in the other longitudinal direction with respect to the second element, which means comprise a second washer arranged around the first element and a circumferential part of which is placed between two second longitudinally opposed supports of said second element and a second elastic return member placed between said second element and said second washer and acting in said other longitudinal direction on the second washer at a point distant from said second supports so as to bring the second washer into an extreme inclined position with respect to the first element, in which position two opposed parts of this second washer are in contact with the first element so as to lock the first element with respect to the second element in said other longitudinal direction, and in that it comprises a second spacer member placed between the second washer and said tilting member so that the aforementioned action on this operating member acts also, via the second spacer member, on the second washer so as to move it away from its aforementioned extreme position against the action of said second return member, reducing its inclination, so as to release the first element with respect to the second element. 
   According to the invention, said first and second locking means are preferably arranged on each side of said tilting member, said tilting member acting in opposite directions on said spacer members. 
   According to the invention, said tilting member preferably comprises a washer which from a distance surrounds said first element and which is mounted in an articulated fashion on the second element, radially relative to the latter. 
   According to the invention, said washers are preferably arranged in internal annular housings of the second element. 
   According to the invention, said spacer members preferably comprise rods that can move longitudinally in passages of the second element. 
   According to the invention, said operating member preferably comprises a longitudinal rod that can move longitudinally in a passage of the second element. 
   According to the invention, said operating member preferably comprises an extension of said tilting member, which extends toward the outside of the second element. 
   According to the invention, the second element preferably comprises two assembled parts the mutual plane of contact of which extends along a longitudinal plane passing through the axis of said elements. Said return members, said spacer members and said operating member are preferably arranged between said assembled parts of the second element, and said tilting member is preferably articulated to the second element about an axis perpendicular to said plane of contact. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will be better understood from studying a device for locking two telescopic elongate elements which is described by way of nonlimiting example and illustrated by way of a drawing in which: 
       FIG. 1  depicts a longitudinal section of a device for locking two telescopic elongate elements, in locked position; 
       FIG. 2  depicts a longitudinal section of the device of  FIG. 1  in the unlocked position; 
       FIGS. 3 ,  4 ,  5  and  6  show radial sections on III—III, IV—IV, V—V and VI—VI of the device depicted in  FIG. 2 , at various points along its length; 
       FIG. 7  depicts a longitudinal section of an alternative form of embodiment of the aforementioned locking device; 
       FIG. 8  depicts a radial section on VIII—VIII of the device of  FIG. 7 ; 
     and  FIG. 9  depicts an application of the aforementioned locking device to a pole. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Referring to  FIGS. 1  to  6 , it can be seen that there is depicted a device  1  for locking, in the longitudinal direction and one with respect to the other, an inner elongate element  2  sliding in a passage  3  of an outer elongate element  4 , these elements  2  and  4  being cylindrical. 
   Referring more specifically to  FIGS. 1 ,  2 ,  4  and  5 , it can be seen that the locking device  1  comprises a tilting washer  5  which is arranged around and some distance from the inner element  2 , in an annular internal housing  6  of the outer element  4 . This ring  5  has diametrically opposed axles  7  and  8  arranged in opposed interior blind holes  9  and  10  of the outer element  4 , so that the washer  5  can pivot about an axis  11  which extends radially with respect to the elements  2  and  4 . 
   As can be seen more specifically in  FIGS. 1 ,  2  and  6 , the locking device  1  further comprises, on one side of the tilting washer  5 , first locking means  12  which comprise a locking washer  13  arranged around the inner element  2  and in an internal annular housing of the outer element  4 . This housing  14  has, on one side of the longitudinal plane passing through the axis  11 , a central narrowing  15  which determines two longitudinally opposed supports  16  and  17  such that the locking washer  13  can pivot in such a way as to adopt positions which are inclined with respect to the axis of the elements  2  and  4 . 
   On the other side of said longitudinal plane, and opposite the narrowing  15 , the locking means  12  comprise a compression spring  18  arranged in a blind longitudinal orifice  19  which opens into the housing  14  toward the tilting washer  5 . This spring  18  acts on the face  16   a  of the washer  13  so as to push it back toward the tilting washer  5 , by pivoting between the supports  16  and  17 . 
   The locking device  1  also comprises a longitudinal spacer rod  20  which is arranged in a longitudinal passage  21  of the outer element  4  which opens on the one hand into the housing  6  and on the other hand into the housing  14 . One of the ends of this spacer rod  20  presses against the face  5   a  of the tilting washer  5  and its other end presses against the face  16   b  of the locking washer  13 , on the opposite side to the spring  18 . 
   As can be seen more specifically in  FIGS. 1 ,  2  and  3 , the locking device  1  further comprises, on the other side of the tilting washer  5 , second locking means  22  which are symmetric with the locking means  12  with respect to the radial axis  11 . 
   These locking means  22  thus comprise a locking washer  23  arranged around the inner element  2  and in an internal housing  24  of the outer element  4 . This housing has a narrowing  25  which determines two longitudinally opposed supports  26  and  27  situated more or less in longitudinal alignment with the spring  18  and the spacer rod  20  of the first locking means  12 . The locking means  22  also comprise a compression spring  28  arranged in a blind longitudinal hole  29  of the outer element  4  and acting on the washer  23  toward the tilting washer  5 . The locking means  22  also comprise a longitudinal spacer rod  30  sliding in a longitudinal passage  31  of the outer element  4 , opening on the one hand, into the housing  6  and on the other hand, into the housing  24 , this spacer rod  30  resting, on the one hand against the opposite face  5   b  of the tilting washer  5  and on the other hand on the locking washer  23 . The spring  28  and the spacer rod  30  are more or less in longitudinal alignment with the supports  16  and  17  of the locking means  12 . 
   The locking device  1  further comprises a longitudinal operating rod  32  arranged in a longitudinal passage  33  of the outer element  4  which passes some distance from the narrowed part  25  of the housing  24  and the end  32   a  of which comes to rest against the face  5   b  of the tilting washer  5 , opposite the spacer rod  20 . 
   In the example described, the outer element  4  comprises two parts  4   a  and  4   b  which between them have a longitudinal plane of contact  4   c  which runs at right angles to the radial axis  11 . These two parts  4   a  and  4   b  of the outer element  4  are joined together by any known means, not depicted, such as screws or by some other means. 
   Thus, the two parts  4   a  and  4   b  of the outer element  4  are symmetric with respect to the longitudinal plane containing the longitudinal contact surface  4   c  so that the passage  3  accommodating the inner element  2 , the housings  6 ,  14  and  24  accommodating the washers  5 ,  13  and  23 , the blind holes  19  and  29  accommodating the springs  18  and  28  and the passages  21 ,  31  and  33  accommodating the rods  20 ,  30  and  32  are formed half in each of the parts  4   a  and  4   b  symmetrically with respect to the plane of contact  4   c.    
   The locking device  1  works as follows. 
   When the operating rod  32  is not subjected to any force, the springs  18  and  28  incline the locking washers  13  and  23  toward the tilting washer  5  until they are brought into an extreme inclined position in which they come into contact with the inner element  2  at two diametrically opposed regions situated one on the same side as the narrowed parts  15  and  27  and the other on the same side as the springs  18  and  28 . As the locking washers  13  and  23  are locked longitudinally in narrowed parts  15  and  25 , they longitudinally, each in one direction, lock the inner element  2  with respect to the outer element  4 , which thus finds itself longitudinally locked in both directions through a wedging effect. 
   By acting longitudinally on the operating rod  32  toward the tilting washer  5 , this tilting washer  5  can then be made to pivot around the radial axis  11 . This tilting movement is then transmitted to the locking washers  13  and  23  via the spacer rods  20  and  30  so as to move them away from their extreme inclined locking position by reducing their inclination against the action of springs  18  and  28 . 
   These unlocking movements release the inner element  2  with respect to the outer element  4  which can then be slid one with respect to the other. When they have reached a given relative longitudinal position, the operating rod  32  is released. The springs  18  and  28  then push the washers  13  and  23  back to bring them back into their locking position described previously, at the same time pushing back the spacer rods  20  and  30  and causing the tilting washer  5  to tilt, this washer itself pushing back the operating rod  32 . 
   With reference to  FIGS. 7 and 8 , it can be seen that there is depicted an alternative form of embodiment of the locking device  1  which differs therefrom in that the operating rod  32  is omitted and in that the tilting washer  5  has a lateral appendage  34  which extends through a passage  35  that passes through the wall of the outer element  4  and opens into the housing  6 . By acting manually on this appendage  34  from outside and longitudinally, it is then possible to cause the tilting washer  5  to tilt as previously in such a way as to act on the washers  13  and  23  in the direction of unlocking them. 
   With reference to  FIG. 9 , it can be seen that there is depicted an example of an application of the connecting device  1  to a pole  36  for example a ski pole or walking pole, of variable length, the inner element  2  of which constitutes its lower part and the outer element  4  of which constitutes its upper part. The upper part of the pole  26  has, at the opposite end to the inner element  2 , a hand grip  37 , the operating rod  32  opening into the upper part of this hand grip  37  and bearing a button  38  for pressing downward to act on the locking device  1  for example provided in the lower part of the outer element  4 .