Implements or apparatus for applying pushing or pulling force – Portable implements or apparatus for tensioning flexible... – Including either force transmitting – hand held and operated...
Patent
1997-09-18
1999-05-18
Walsh, Donald P.
Implements or apparatus for applying pushing or pulling force
Portable implements or apparatus for tensioning flexible...
Including either force transmitting, hand held and operated...
254214, 254223, 254226, 254245, 254254, B21F9/00
Patent
active
059043415
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to a device for the application of a tensioning force in a strap, including a frame having two separate side pieces between which is arranged a rotatable reel with a through slot into which a strap may be introduced, a manually grippable command means that is pivotably movable reciprocally around one and the same geometrical axis, around which the reel is rotatable, and at least one ratchet wheel which is co-rotatively connected to the reel and cooperates with two spring-loaded latch elements of which a first one is mounted on the frame and movable towards and away from the wheel's peripherical tooth rim, while the second one is mounted on the command means and equally movably towards and away from the tooth rim, the first latch element on one hand being held in engagement with the tooth rim and locking the wheel when the command means during a return movement is brought to turn into either one of two opposite directions relative to the frame, at the same time as the second latch element may freely ride outside the teeth of the rim, and on the other hand freely riding outside the teeth of the rim when the command means during a feeding movement is brought to turn into the opposite direction at the same time as the second latch element is in locking engagement with the tooth rim and carries the wheel, and thereby, also the reel.
PRIOR ART
Devices of the above mentioned sort have been known for a long time and are commercially available under the term strap tensioners. According to these known strap tensioners, also the command means comprises two separate side pieces or legs, which are interconnected via a cross-piece serving as a handle at that end of the means that is opposed to the reel. The distance between the two side pieces of the command means is so much larger than the distance between the two side pieces of the frame that interspaces are created between two cooperating side pieces, in which interspaces two ratchet wheels are accomodated. The reel consists of two equally shaped bodies which cross-sectionally are substantially shaped as segments of a circle, which bodies are led into holes in the ratchet wheels. By the fact that these holes have substantially the same cross-sectional shape as the two reel bodies, a co-rotative connection is achieved between these and the ratchet wheels at the same time as the reel bodies are kept at a distance from each other, thus forming a central, through slot for the strap. The two reel bodies or halves are held in place by means of locking pins placed on the outside of the side pieces of the command means. The teeth of the two ratchet wheels have on one hand an arched edge surface along which the respective latch element can freely ride from the root to the top, and on the other hand an edge surface extending substantially radially, against which the latch element is locked. The teeth are placed in such a way that the feed of the strap takes place when the command means is turned into a direction away from the frame, while the return movement without any strap feed takes place when the command means is turned in the opposite direction.
One embodiment of this known strap tensioner is shown in FIG. 4 of SE 8305190.4.
An advantage of the known strap tensioner is that it is constructionally simple and sturdy and, thereby, inexpensive to produce. However, a drawback is that the device in question is only possible to use precisely for tensioning a strap and, thereafter, to keep the strap in this tensioned state. This restricts the fields of use of the device to a high degree. Further, the two halves of the reel are in contact with comparatively long hole edge surfaces, at the two side pieces of the frame as well as the two side pieces of the command means. This implies that the friction between the reel and said side pieces becomes large; something that in practice results in that the turning of the command means, which is necessary for the feeding of the strap, requires a large force, in particular when the
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Marcelo Emmanuel M.
Siemens Terrance L.
Walsh Donald P.
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