Stick with shock-absorber

Abstract: A stick with shock-absorber including: an elongated member associated with a movable member with the interposition of a shock-absorbing member; a means for activating and deactivating the shock-absorbing member and adapted to determine a first shock-absorbing condition and a second condition in which shock-absorbing is disabled. The movable member includes a grip body which is adapted to be gripped by a user, and the shock-absorbing member and the activation and deactivation means are arranged substantially at the grip body.

Description: The present invention relates to a stick with shock-absorber. Trekking sticks used by hikers in order to improve their stability, especially on rough terrain, by providing an additional support, are known. These sticks are adapted to cushion the impacts and vibrations generated by contact with the ground but, if necessary, they can be converted into fully rigid sticks which are more useful, for example, when climbing. Some of these sticks are constituted by two generally cylindrical coaxial members, one of which remains in contact with the ground, the second one being connected to the grip of the stick. The upper member ends with a central pin which has a smaller diameter than the lower member, so that it can be arranged partially in the lower member so as to allow mutual sliding, so that the entire assembly constitutes a single tube. A spring arranged around the central pin of the upper tube and contrasted by the edge of the lower tube acts as a cushioning device between the two members, allowing the stick to absorb the stresses with respect to the ground. The elongation of this telescopic system is determined by the stroke of the central pin with respect to the lower tube. Accordingly, a protrusion is provided at right angles on the pin and enters a slot which is shaped like an inverted L and is formed on the internal surface of the lower tube, constituting a guide for the protrusion and therefore a means for mutually locking the two telescopic members. By turning the two members that constitute the stick with respect to each other, the protrusion of the pin is moved along the horizontal part of the slot. At one end, the protrusion can slide along the longer vertical side of the L-shaped slot, thus allowing the pin to slide and enabling the shock-absorbing device; at the other end, the protrusion is locked and the shock-absorbing device is disabled. These devices have the drawback that they are particularly heavy due to the central pin; moreover, the weight produces an unfavorable leverage for the user's wrist. US 4 448 442 discloses a longitudinally adjustable ski pole comprising an adjustable lenght device that works also as an activating and deactivating means of a shock-absorbing member. This ski pole is provided with two telescopically movable tube sections which are inserted into each other and with a pivoting cylinder at which are partly provided said activating and deactivang means. The pivoting cylinder is pivotably supported in one telescopically movable tube. Another drawback consists of the fact that dust and moisture, by penetrating in the region where the shock-absorbing system is arranged, tend to compromise its correct operation. Another disadvantage is constituted by the high cost due to the components and their assembly. Other conventional trekking sticks are constituted by a single cylindrical body, which constitutes the stick itself and at the top of which a contrast disk is applied, and by a grip, which is coaxial to the stick and can slide along it. The stroke of the grip is delimited by an elastic band which is applied along a guide which is formed inside the grip and is connected, by means of a hook, to the contrast disk, to which the grip adheres when the elastic band is at rest. The grip, the elastic band and the contrast disk constitute the shock-absorbing device. These shock-absorbing systems have the drawback that it is difficult to disable the device in the grip, because it is necessary to disengage the elastic band and apply the grip to the contrast disk, this being a troublesome and slow operation. Another disadvantage is the fact that since the shock-absorbing member is actually an elastic band, there is no preset stroke limit, except the maximum elongation of the elastic band, with the risk of forward imbalance for the user. Another disadvantage is the upper space occupation of the grip due to the elastic band contained therein, not to mention the fact that the debris that penetrates between the grip and the contrast disk tends to prevent the operation of the device. The aim of the present invention is to overcome the drawbacks of the prior art. An important object of the invention is to provide a stick with shock-absorber which can be adjusted easily and simply by the user. Another object of the invention is to provide a stick with shock-absorber which is lighter. Another object of the invention is to provide a stick with shock-absorber which can be manufactured with lower production costs than conventional sticks. This aim and these and other objects which will become better apparent hereinafter are achieved by a stick provide with shock-absorber and comprising: an elongated stick member, a grip member which is movably mounted at one end of said elongated stick member, and adapted to be gripped by a user, a shock-absorbing member arranged to act on both said elongated stick member and said grip member, an activation and deactivation means for activating and deactivating said shock-absorbing member designed to determine a first shock-absorbing condition and a second condition in which shock-absorbing is disabled and including at least one slot formed in either said,elongated member or said grip member and further including a pin member rigidly coupled to said grip member or said elongated member, respectively, said pin member engaging with said at least one slot, said shock-absorbing member and said activation and deactivation means being arranged substantially at said grip member, characterized in that each slot includes a first region and a second region and said pin member is movable from an absorbing position in which said pin member can freely slide in said first region to accomodate relative motion of said elongated member and said grip member to a locking position in which sliding of said pin member is limited in said second region and relative motion of said elongated member and said grip member is substantially prevented, and in that at least one cam means is provided in said at least one slot arranged to narrow said at least one slot between said first region and said second region, thereby preventing said pin member from freely sliding from said first region to said second region. Further characteristics and advantages of the present invention will become better apparent from the following detailed description of preferred but not exclusive embodiments thereof, illustrated only by way of non-limitative example in the accompanying drawings, wherein: Figure 1 is a partially sectional side view of the upper portion of the stick according to the invention, shown in the position in which the shock-absorbing system is disabled; Figure 2 is a view, similar to Figure 1, of the stick in an intermediate position during the movement required to activate the shock-absorbing system; Figure 3 is a view, similar to Figure 2, of the stick in the condition in which the shock-absorbing system is enabled; Figure 4 is a view, similar to Figure 3, with the shock-absorbing system in action (the spring is compressed); Figure 5 is a perspective view of the detail of the slots for the sliding of the pin according to the invention; Figure 6 is a partially sectional side view of a stick according to a further aspect of the invention; Figure 7 is an enlarged-scale sectional view of a detail of the means for activating and deactivating the shock-absorbing member. With reference to the figures, the stick with shock-absorber according to the invention, generally designated by the reference numerals 1, 101, comprises an elongated member 5, 105, which constitutes the main body of the stick, and a movable member 2, 102, which is adapted to be gripped by the user. In the specific example, the elongated member is constituted by a tube 5, 105, an upper end of which is inserted in a cavity 3, 103, formed in the movable member constituted by a grip body 2, 102, with the interposition of a flexible means 4,104. With particular reference to Figures 1 to 5, the grip body 2, which can be anatomically contoured in order to facilitate the user's grasp, as in the illustrated example, has a cylindrical cavity 3 in which the upper end of the tubular member 5 is inserted. The elastically deformable means includes a progressive spring 4 which contrasts, at one end, against a bottom 6 of the cavity 3 of the grip body 2 and, at the other end, against a disk 7 which is arranged in a narrower portion 8 of the tube 5. The spring 4 allows to cushion the shocks generated by the impact of the tip of the stick (not shown) on the ground. The stroke of the tube 5, and therefore of the stick by way of the action of the spring, is determined by at least one shaped slot 9 and 10 which is formed in the tubular member 5 and is engaged by a pin 12 which is rigidly coupled to the movable member 2. The pin 12 comprises, for example, an oval head 16 which engages a seat 17 of the body 2 so as to prevent the rotation of the pin with respect to the body 2, in order to prevent shearing of the pin. In the illustrated example, the stick 1 comprises two slots 9, 10 which are obtained by cutting the tube 5 in the region 11 below the disk 7. Each slot 9, 10 is shaped like an inverted L, with its upper ends shaped so as to form a cam 15. In this manner, each slot 9, 10 forms a first region 14 for the free sliding of the pin and a second region 13 for limited sliding; the regions are separated by the cam 15. When the pin 12 is arranged in the second region 13, as shown in Figure 1, which corresponds to the condition in which shock-absorbing is disabled, the tube 5 is prevented from sliding within the cavity 3 of the body 2 and the operation of the spring is thus disabled; the grip-stick assembly thus behaves like a single rigid system. By lowering and turning the grip with respect to the stick, as shown schematically in Figure 2, the pin 12 is moved beyond the cam 15 from the second region 13 to the first region 14 of the slot 9 and 10; this position is shown in Figure 3. In this position, the pin 12 can slide freely along the first region 14, allowing a stroke of the tube 5 inside the cavity 3 of the body 2, such that the spring 4 can cushion the forces transmitted to the stick from the ground. Figure 4 illustrates the stroke limit position of the pin 12 in the first region 14. The sliding condition of the pin 12 in the first region 14 of the slot 9, shown in Figures 3 and 4, corresponds to the condition in which shock-absorbing is enabled. Whenever the user strikes the ground with the tip of the stick, the impact produces a sliding of the tube of the stick within the cavity of the grip and a consequent reaction of the spring, which tends to elongate and return the tube to the initial position. In order to deactivate the system it is sufficient to turn the knob so that the pin can move beyond the cam 15 (Figure 2) and be arranged again in the second region 13, as shown in Figure 1. With reference to Figure 6, according to another embodiment of the invention the elastically deformable means is constituted by a fluid-type shock absorber which comprises, in the illustrated example, a nitrogen-pressurized damper 104 of a per se known type. The nitrogen-pressurized damper 104 is arranged in the cavity 103 of the grip body 102 and has a first end which, by means of a screw 120, is fastened to the bottom 106 of the cavity. The second end of the damper 104 acts in contrast with a disk 107 which is arranged in a narrower portion 108 of the tube 105. The stroke of the tube 105 and therefore of the entire stick is determined by the mechanical characteristics of the nitrogen-pressurized piston. Activation and deactivation of the damper can be performed by means of a guide system which is similar to the one described above for the first embodiment or, as an alternative, by means of the locking/release of the passage port, which can be activated by means of an external button. In practice it has been observed that the invention achieves the intended aim and objects, a stick with shock-absorber having been provided which is lightweight and particularly simple from the manufacturing viewpoint. Because of the limited number of components used to provide the shock-absorbing stick according to the invention, a substantial reduction in manufacturing cost and a lower weight than conventional shock-absorbing sticks have been achieved. Another advantage of the stick with shock-absorber according to the invention is due to the favorable weight distribution, particularly proximate to the wrist of the user. Another advantage of the stick according to the invention is its very easy use as regards the system for enabling and disabling the shock-absorbing system. The stick according to the invention is susceptible of numerous modifications and variations, within the scope of the appended claims. All the details may be replaced with other technically equivalent elements. The materials and the dimensions may of course be any according to requirements and to the state of the art.

Claims: A stick provided with shock-absorber and comprising: an elongated stick member (5; 105), a grip member (2; 102) which is movably mounted at one end of said elongated stick member (5; 105), and adapted to be gripped by a user, a shock-absorbing member (4; 104) arranged to act on both said elongated stick member (5; 105) and said grip member (2; 102), an activation and deactivation means (9, 10, 12) for activating and deactivating said shock-absorbing member (4; 104) designed to determine a first shock-absorbing condition and a second condition in which shock-absorbing is disabled and including at least one slot (9, 10) formed in either said elongated member (5; 105) or said grip member (2; 102) and further including a pin member (12) rigidly coupled to said grip member (2; 102) or said elongated member (5; 105), respectively, said pin member (12) engaging with said at least one slot (9, 10), said shock-absorbing member (4; 104) and said activation and deactivation means (9, 10, 12) being arranged substantially at said grip member (2; 102), characterized in that each slot (9, 10) includes a first region (14) and a second region (13) and said pin member (12) is movable from an absorbing position in which said pin member (12) can freely slide in said first region (14) to accommodate relative motion of said elongated member (5; 105) and said grip member (2; 102) to a locking position in which sliding of said pin member (12) is limited in said second region (13) and relative motion of said elongated member (5; 105) and said grip member (2; 102) is substantially prevented, and in that at least one cam means (15) is provided in said at least one slot (9, 10) arranged to narrow said at least one slot between said first region (14) and said second region (13), thereby preventing said pin member (12) from freely sliding from said first region (14) to said second region (13). A stick as claimed in claim 1, characterized in that said grip member (2; 102) is formed with a cavity (3; 103) accommodating an end portion of said elongated member (5, 105) and said shock-absorbing member (4, 104), the latter being arranged to act directly between an end wall of said cavity (3, 103) and said end portion. A stick according to claim 2 or 3, wherein said end portion of said elongated member (5; 105) comprises an abutment disc member (7; 107) engaging one end of said shock-absorbing member (4; 104) and characterized in that said abutment disc member (7; 107) is arranged in a narrowed portion (8; 108) formed in said end portion of said elongated member (5; 105). A stick according to any preceding claim, characterized in that said shock-absorbing member (4; 104) comprises a nitrogen-pressurized damper (104).

Inventors: ZALTRON RENATO, ZALTRON, RENATO
Applicants: ZALTRON RENATO, ZALTRON, RENATO
Application year: 2001
Main classification: A63C11
IPC codes: A63C11