US 5,653,095 A · Tensioning and sealing apparatus for strapping an object with a plastic band

Abstract

A tensioning and sealing apparatus for strapping an object (2) with a plastic band (1) includes a housing (3) having a tensioning unit (4) for retaining two ends (6, 7) of the plastic band (1) which are to be sealed and for tensioning the same and having a sealing unit (5) for connecting the two mutually overlapping ends (6, 7). The tensioning unit (4) has a tensioning shoe (10) and a toothed tensioning wheel (13) which is mounted on a pivotable rocker (11), which can be driven via a tensioning shaft (12), and which is intended for pressing the plastic band (1) against the tensioning shoe (10) and for gripping the same upon rotation. The bearing (15) of the pivotable rocker (11) is arranged on the side of the tensioning shoe (10) and behind the latter in the tensioning direction (14), the rocker axis being located between a bearing surface (16) of the tensioning shoe (10) and a base plate (8). The result is that the rocker (11), with the tensioning wheel (13), on the one hand exerts a sufficient press-on force on the plastic band (1) to be tensioned, and on the other hand can be raised again in any position of use of the apparatus without a great deal of force.

Claims20

Dependent claims

An improved tensioning and sealing apparatus for strapping an object with a plastic band, which apparatus includes a base plate and a housing having a tensioning unit means for retaining two ends of the plastic band which are to be sealed and for tensioning the band in a tensioning direction and having a sealing unit means for connecting the two ends in a mutually overlapping relationship, the tensioning unit means including a tensioning shoe having a bearing surface, a pivotable rocker having a bearing and a rocker axis, a toothed tensioning wheel carried by the pivotable rocker to press the plastic band against the tensioning shoe and to grip the plastic band, and drive means for rotating the tensioning wheel, the drive means including a tensioning shaft, wherein the improvement comprises:

the bearing of the pivotable rocker is arranged on a side of the tensioning shoe and behind the tensioning shoe in the tensioning direction, the rocker axis being located between the bearing surface of the tensioning shoe and the base plate.

An apparatus for tensioning a band that is looped around an object, comprising:

a pivotally mounted rocker;
a tensioning shaft rotatably mounted on the rocker;
a tensioning lever;
ratchet means for rotating the tensioning shaft in one of a clockwise direction and a counter-clockwise direction when the tensioning lever is reciprocated;
a movably mounted tensioning shoe disposed below the tensioning shaft, the tensioning shoe having a bottom side and a top side with a bearing surface and a supporting surface;
a bearing member loosely disposed around the tensioning shaft at a position above the supporting surface of the tensioning shoe;
control means for controlling the position of the bearing member with respect to the tensioning shaft, the control means being movable between a first position wherein the bearing member is constrained to be concentric with respect to the tensioning shaft and a second position wherein the bearing member is not constrained to be concentric with the tensioning shaft;
a first gripping plate mounted on the bottom side of the tensioning shoe;
a second gripping plate fixedly mounted below the first gripping plate, a first portion of the band being inserted between the gripping plates;
spring means for urging the rocker in the other of the clockwise direction and the counter-clockwise direction, the bearing member being urged against the supporting surface of the tensioning shoe to press the tensioning shoe toward the second gripping plate when the rocker is in a non-engaged position and the control means is in its first position;
and
a tensioning wheel mounted on the tensioning shaft, a second portion of the band being inserted between the tensioning wheel and the bearing surface of the tensioning shoe, the tensioning wheel being pressed against the second portion of the band when the rocker is in a tensioning position and the control means is in its second position.

9 more elements

Dependencies are inferred from the claim text.

Tensioning and sealing apparatus for strapping an object with a plastic band

Life of this patent

Tensioning and sealing apparatus for strapping an object with a plastic band

Life of this patent

Abstract

Claims20