Fire escape – ladder – or scaffold – Torso harness
Patent
1986-06-10
1987-12-22
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Torso harness
A62B 116
Patent
active
047141344
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to an improvement in safety belts and the like of the kind which comprise a rope or a similar elongated, flexible means which is threaded through one or several lead-troughs from which latter at least one is designed as a locking device for the rope. More specifically the invention refers to that particular kind of safety belt where the flexible element is hollow and has the characteristic that it when axially compressed will expand radially thus increasing the inner diameter thereof but is contracted radially consequently diminishing the inner diameter thereof when exposed to an axial pulling action. In the following the flexible element will be referred to as hose but in practice it usually consists of a rope which is made by braiding yarn, plastic strips or the like.
The Swedish Pat. No. 367 546 describes a safety belt in which the locking of the rope is achieved by threading a first strand of the rope through a second strand thereof where the first rope strand is introduced through a first opening in the second rope strand, extends inside the latter a certain length and leaves it through a second opening.
A locking device of this character has a number of advantages from which the effective locking action and the neglectible wear for which the rope is exposed may be mentioned.
A drawback of the known device however is that the rope will be weakened in the region of the openings.
The object of the invention has thus primarily been to eliminate this drawback and to achieve this and further objects the invention has the characteristics of the patent claims.
In the accompanying drawing an exemplary embodiment of the invention is illustrated.
FIG. 1 schematically shows a part of a safety belt or the like with a lead-through with locking device according to a first embodiment of the invention
FIG. 2 in perspective shows a lead-through with locking device according to a second embodiment and
FIG. 3 finally is a schematical longitudinal section through a lead-through with locking device according to a third embodiment.
Although the invention primarily refers to a safety belt it will also--which will be apparent from the following--lend itself to use in all applications in which a rope or rope strand is guided through a lead-through to which it may be locked.
In the embodiment illustrated in FIG. 1 the numeral 1 generally designates a lead-through for a first hose 2. The lead-through then consists of a second hose 3, which may be a separate part or a part of the first hose 2 which then preferably is formed to a loop. In said second hose there is provided a first opening 4 through which the first hose extends into the second hose and a second opening 5, located at an axial distance from the first opening and the first hose passes out of the second hose through said second opening.
In the illustrated example the second hose 3 forms a free lower part 6 and a free upper part 7 but said free parts 6 and 7 are respectively threaded through openings 8, 8' in the second hose 3 after having formed respective knots 9, 9' which substantially surround the openings 4 and 5, respectively. A reinforcement of the lead-through 1 in the weakened portions thereof where the first hose 2 passes through the second hose 3 is achieved hereby which means that the drawback of the known construction referred to is eliminated in a very simple manner.
To operate the device just described the knot 9 at the left in the drawing is manually moved towards the other knot 9' when it is desired to pull the first hose 2 through the lead-through 1.
Owing to the fact that the portion of the second hose which is located between the knots 9 and 9' at this operation will be compressed axially, the inner diameter thereof will be widened such that the first hose 2 may pass through the lead-through 1 unobstructed.
When the first rope has been pulled out as much as desired the adjustment made will be secured by simply pulling the knot 9 away out from the knot 9' causing the portion of the hose 3 which is located between the knot
REFERENCES:
patent: 1892611 (1932-12-01), Dawes
patent: 2254179 (1941-08-01), Hoyt
patent: 2412895 (1946-12-01), Lewis
patent: 3941208 (1976-03-01), St. Germain
patent: 4477948 (1984-10-01), Sachs
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