A tool, such as a tape measure, including a spring-based retraction system is shown. Various spring-based retraction system embodiments are configured to decrease the size occupied by the spring within the tape measure housing, which consequently reduces tape measure housing size providing a more compact tape measure. Various spring-based retraction system embodiments are configured to control retraction of the tape measure in a manner that reduces whip or otherwise controls tape blade retraction. Some retraction system embodiments utilize a reduction gear train, and others utilize a compression spring and a transmission system that converts rotational movement of the tape reel to axial movement, which compresses the spring.

A tool, such as a tape measure, including a spring-based retraction system is shown. Various spring-based retraction system embodiments are configured to decrease the size occupied by the spring within the tape measure housing, which consequently reduces tape measure housing size providing a more compact tape measure. Various spring-based retraction system embodiments are configured to control retraction of the tape measure in a manner that reduces whip or otherwise controls tape blade retraction. Some retraction system embodiments utilize a reduction gear train, and others utilize a compression spring and a transmission system that converts rotational movement of the tape reel to axial movement, which compresses the spring.

A system for obtaining spatial measurements between objects such as crops in an agricultural field. The system includes a measurement device including a motorized reel containing a wound length of measuring line, and electronic encoder with shaft rotated in opposing directions by dispensing or retrieving measuring line. A pivotably movable spring-biased tension arm maintains tension in the line when being rewound. The tension arm is responsive to changes in line tension and configured to automatically start the motor to rewind the line onto the reel based on angular position of the arm. A gear train includes a translatable shuttle gear which selectively couples the reel to the motor based on movement of the tension arm. The encoder converts rotary motion of its shaft into linear field measurements. In one implementation, the tension arm comprises an inboard arm and outboard arm with translatable pulley coupled thereto by an articulated joint.

A system for obtaining spatial measurements between objects such as crops in an agricultural field. The system includes a measurement device including a motorized reel containing a wound length of measuring line, and electronic encoder with shaft rotated in opposing directions by dispensing or retrieving measuring line. A pivotably movable spring-biased tension arm maintains tension in the line when being rewound. The tension arm is responsive to changes in line tension and configured to automatically start the motor to rewind the line onto the reel based on angular position of the arm. A gear train includes a translatable shuttle gear which selectively couples the reel to the motor based on movement of the tension arm. The encoder converts rotary motion of its shaft into linear field measurements. In one implementation, the tension arm comprises an inboard arm and outboard arm with translatable pulley coupled thereto by an articulated joint.

A tool, such as a tape measure, including a spring-based retraction system is shown. The spring-based retraction system is driven by a spiral spring, that has a variable preformed stress profile along the length of the spring.

A tool, such as a tape measure, including a spring-based retraction system is shown. The spring-based retraction system is driven by a spiral spring, that has a variable preformed stress profile along the length of the spring.

Disclosed is a tape measure, comprising: a tape measure housing (1) provided with an accommodating cavity; a tape core assembly (2) arranged in the accommodating cavity; and a tape belt assembly (3) wound around the tape core assembly (2). The tape measure housing (1) is further provided with a tape outlet for the tape belt assembly (3) to extend outwards. The tape measure further comprises a braking assembly (4) and a driving assembly (5), wherein the driving assembly (5) is movably mounted onto the tape measure housing (1); the tape core assembly (2) is provided with a braking face (201); the driving assembly (5) drives the braking assembly (4) to come into contact with the braking face (201) of the tape core assembly (2) and to press the same, thereby realizing braking. Abrasion of the scale on the surface of a tape belt is effectively prevented.

Various aspects of tape measures with one or more of a sensor, a motor, and a clutch, are shown. The sensors described herein detect, through various mechanisms, the position of the retraction system of a tape measure. The measurements by the sensors may be used to control a motor to adjust an amount of tension in the spiral spring of a tape measure. In various embodiments a motor interacts with the retraction system of the tape measure via a clutch, which moderates an amount of force that the motor can communicate to the retraction system.

Various aspects of tape measures with one or more of a sensor, a motor, and a clutch, are shown. The sensors described herein detect, through various mechanisms, the position of the retraction system of a tape measure. The measurements by the sensors may be used to control a motor to adjust an amount of tension in the spiral spring of a tape measure. In various embodiments a motor interacts with the retraction system of the tape measure via a clutch, which moderates an amount of force that the motor can communicate to the retraction system.

A tool, such as a tape measure, including a retraction system is shown. The tape measure includes a magnetic retraction speed controller. The magnetic retraction speed controller includes a magnet that induces an eddy current in a conductive component of the tool and slows a retraction speed.