DK150232B - STEPABLE, LENGTH ADJUSTABLE CREW, STOCK AND LIKE - Google Patents

Description

150232

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a stepless, length-adjustable crutch or cane comprising an outer tube having at least one out and in of the lower end by means of a conventional gas spring or other spring telescopically displaceable inner tube and the outer tube at the upper end being provided with a handle suitable for use.

Such stepless length-adjustable crutches are under various conditions greatly assisted by walking difficulties in the upright position or by forcing obstacles such as stairs, slopes and much more by being able to get help from the crutches for a shorter length, as well as assisting the user with their own help being able to sit in a chair and get up from there again.

A crutch of this kind is known from Danish Patent Specification No. 146,917, wherein the inner tube is ejected by means of a spring which is divided by a plunger into two chambers, in which a gas or a gas / liquid mixture through a connection is passed from one chamber to the other depending on whether the crutch is pushed into its fully extended position or whether it is compressed. Since a gas is compressible and there are limits to how much pressure the gas can have, the crutch will give more or less as it is loaded. Thus, the crutch will act resilient during use, due to the compressibility of the gas.

The object of the invention is to provide a crutch or cane of the specified type which is not resilient during use. This is achieved according to the invention by forming the crutch such that it comprises a piston rod attached to the upper end of the outer tube and extending into the inner tube, the piston rod being connected to a displaceable piston dividing. the inner tube in two chambers, the inner tube being closed at both ends and the piston rod being sealed through one end, and the inner tube being filled with a liquid preferably oil and comprising a through valve spindle disposed in a central bore of the piston rod and in the valve piston and provided. with a valve cone for closing a passage of the fluid through the valve piston from one chamber 10 to the other, and at the other end is spring loaded for closure and the gas spring is disposed at the lower end of the inner tube to cooperate with the piston and has a release mechanism for actuating the valve 1 spindle for opening the valve cone, since the valve piston is locked in the inner tube with fluid on both sides, which is not assembled jerky, the stick will, under normal use, have a fairly firm length and not be resilient. The liquid also provides a damping effect when passing through the piston bore when the inner tube is ejected, respectively, when the crutch is compressed. Thus, the sudden shocks that can occur if operated by gas alone or a gas / liquid mixture are avoided. The construction is also better in technical terms, since it is easier to completely seal for liquid than for gas.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be explained in more detail with reference to the accompanying drawings, which illustrate, schematically, an embodiment of a crutch according to the invention.

In the drawing: FIG. 1 is a longitudinal sectional view of the crutch, the handle otherwise seated to the right of the figure is not shown, as is a dipping shoe of 5 the lower end of the crutch to the left whole clay is not shown as not serving to understand the invention, and FIG. . 2 is a longitudinal section in larger scale of the upper end of the inner tube and the outer tube in shortened form.

The jar according to the invention comprises an outer tube 1 and a telescopically displaceable inner tube 2 therein. The outer tube 1 goes to the right of the drawing into a handle not shown, just as the inner tube 2 to the left of the drawing goes over 15 in a non-dipped shoe. Basic settings of the crutch can, as mentioned in the introduction, be made in various ways, e.g. by not adjusting the dipping shoe or by providing the crutch with handles and hanger of different length.

Centrally in the outer tube 1 is arranged a hollow piston rod 3, which is screwed in with the upper end into a fixing block 4 located in the upper end of the outer tube 1 and held between two locking rings 5,6. To prevent the piston rod from loosening, it is screwed on a counter nut 25 7. The piston rod 3 extends in the longitudinal direction of the crutch down into the inner tube 2, where it is screwed on a piston 8 which is sealed to the outer walls of the inner tube with hydraulic gaskets 9.

The inner tube is closed at both ends. At the outer end it is closed due to a gas cylinder 10 and at the other end with a cylinder cover 11, 4 150232 which sits against a locking ring 12 and sealed against the outer wall with an O-ring 13. The piston rod 3 goes through a central bore in the cylinder cover 11 and is sealed with an O-ring 14.

The piston 8 is loaded by the gas spring 10 to the right of the drawing, the piston rod 15 of the gas spring at the end carrying a pressure shoe 16 pressing against the underside of the piston.

In the piston rod 3 and in the piston 8 there is a through-bore, in which is mounted a valve spindle 17, which carries at the end a valve cone 18 with an embedded O-ring 19 for closing against the underside of the piston. The valve cone 18 is accommodated in a recess 20 in the gas spring pressure shoe 16. The valve is spring-loaded for closure by means of a coil spring 21 disposed at the opposite end around the valve stem and clamping between the upper end of the piston rod and a stop ring 22 secured to the valve stem. is opened by means of a release handle shown here as a lever 23 which can be rotated about a shaft 24 and which pressurizes the end of the valve stem 17.

The inner tube 2 is divided into two chambers 25, 26 by the piston 8, where there is fluid passage from one to the other through recesses 27 in the upper edge of the pressure shoe 16 and 25 further through the bore 28 in the piston 8 and from there further through a duct 29 For sealing reasons, a 0-ring 30. is provided at the top of the piston rod. It is noted that the piston rod 3 and the piston rod of the gas spring have the same dimension, so that the displaced liquid volume from one chamber corresponds to the cavity formed in the other chamber.

The operation of the crutch will be explained below. When the crutch is handed over to a person, the previously mentioned basic setting with the gas spring is made in its fully extended position. To this end, the release lever 23 is actuated to open the valve so that there is passage from chamber 5 through passage 27,28,29 to chamber 26 and the pressure of the gas spring will push the crutch into its fully extended position. If the crutch is to be shortened during use, the crutch is loaded for compression, whereby the liquid will flow from the chamber 25 through the open valve to chamber 10. the said axial force, whereby the gas spring will push the inner tube 2 outwardly, as fluid then flows from chamber 26 to chamber 25.

When the release lever 23 is released, the piston is locked in the liquid so that the crutch has a fixed length. If you stand in an upright position and lean against the crutch and load it relatively hard, and inadvertently come to actuate the release lever, the crutch will not immediately compress as the fluid pressure in the lower chamber 25 will press the valve cone 18 to close. When seated, actuate the release lever 23 and lightly load the stick, whereby liquid will flow from the chamber 25 and through the open valve to the upper chamber 26, 25 while compressing the gas spring and the crutch becoming smaller. This helps the disabled person to be put in a sitting position rather than dumping the last piece, which is as bothersome as not being able to get up. When the disabled person needs to get up again 30, the trigger grip 23 is actuated again and the accumulated pressure energy in the gas spring 10 will affect the piston 8 and fluid will flow from the upper chamber 26 to the lower chamber 25, thereby assisting the disabled person in the upright position. .

Thus, the crutch is advantageous in terms of use, in that it can be infinitely regulated in length, as is the disabled person to sit down and rise again, on stairs and similar places it can be quickly and easily adjusted to it. right 5 length. In addition, the jar is comparable to a regular crutch in that it is not resilient during use, with the plunger 8 being locked in a liquid which per minute. definition is inconsistent. In principle, this corresponds to the crutch being mechanically locked in its individual positions. Purely 10 handling, the crutch is comfortable with a suitable weight distribution, with the gas spring 10 being placed at the end of the outer tube 2. Another thing is that the crutch does not fill more than a very ordinary crutch.