The present invention is directed to child safety seats, and more particularly to a harness or belt tensioning indicator for a child safety seat harness system. The tension indicator includes a body portion for receiving a belt, harness or webbing. The tension indicator also includes a sliding indicator that is capable of moving from a first, unactuated position to a second, actuated position when the belt, harness or webbing that is received in the body portion is tensioned from a first tension to a second, correct tension.

The present invention is directed to child safety seats, and more particularly to a harness or belt tensioning indicator for a child safety seat harness system. The tension indicator includes a body portion for receiving a belt, harness or webbing. The tension indicator also includes a sliding indicator that is capable of moving from a first, unactuated position to a second, actuated position when the belt, harness or webbing that is received in the body portion is tensioned from a first tension to a second, correct tension.

A system for monitoring tension forces of tendons disposed inside a concrete structure in post-tensioning includes a hydraulic jack coupled to one tendon at one end of the concrete structure to apply the tension force to the tendon by means of the forward movement of a piston; a hydraulic pump connected to the hydraulic jack by means of a hydraulic pressure supply pipe to supply a hydraulic pressure to the hydraulic jack; a digital elongation length measurement sensor disposed on the hydraulic jack to measure the elongation length of the piston; a measurement unit having a data logger adapted to receive and store the elongation length data measured by the digital elongation length measurement sensor and to send the elongation length data to a main server; a digital pressure measurement sensor disposed on the hydraulic pressure supply pipe of the hydraulic pump; and a control module adapted to receive the elongation length data from the data logger or the main server, calculate the tension force, compensate for the coefficient of elasticity of the tendon according to the ratio of the real-time elongation length data to the pressure data, and compensate for the tension force calculated.

A system for monitoring tension forces of tendons disposed inside a concrete structure in post-tensioning includes a hydraulic jack coupled to one tendon at one end of the concrete structure to apply the tension force to the tendon by means of the forward movement of a piston; a hydraulic pump connected to the hydraulic jack by means of a hydraulic pressure supply pipe to supply a hydraulic pressure to the hydraulic jack; a digital elongation length measurement sensor disposed on the hydraulic jack to measure the elongation length of the piston; a measurement unit having a data logger adapted to receive and store the elongation length data measured by the digital elongation length measurement sensor and to send the elongation length data to a main server; a digital pressure measurement sensor disposed on the hydraulic pressure supply pipe of the hydraulic pump; and a control module adapted to receive the elongation length data from the data logger or the main server, calculate the tension force, compensate for the coefficient of elasticity of the tendon according to the ratio of the real-time elongation length data to the pressure data, and compensate for the tension force calculated.

A belt tension measurement device includes a sleeve with an opening in at least one end, a shaft insertable into the opening where at least a portion of the shaft protrudes from the opening when in a zero position, and a first securing component configured to couple the sleeve to a surface of a power transmission belt and an additional securing component configured to couple the shaft to the surface of the power transmission belt. The shaft includes one or more sets of marks. A set of the one or more sets of marks includes at least one mark. The at least one mark corresponds to at least one shaft position where the power transmission belt is tensioned a pre-determined amount via an extension force generated by an elongation of the power transmission belt. The shaft is moveable between the zero position and the at least one shaft position.

A belt tension measurement device includes a sleeve with an opening in at least one end, a shaft insertable into the opening where at least a portion of the shaft protrudes from the opening when in a zero position, and a first securing component configured to couple the sleeve to a surface of a power transmission belt and an additional securing component configured to couple the shaft to the surface of the power transmission belt. The shaft includes one or more sets of marks. A set of the one or more sets of marks includes at least one mark. The at least one mark corresponds to at least one shaft position where the power transmission belt is tensioned a pre-determined amount via an extension force generated by an elongation of the power transmission belt. The shaft is moveable between the zero position and the at least one shaft position.

Devices and systems for track tension measurement and alignment of tracked vehicles are provided. In various embodiments, a device for measuring tension on a continuous track is provided, the device comprising a shaft having a hollow cross section, a pin disposed at least partially through an aperture of the top end of the shaft, a compression member disposed within the inner volume of the shaft, and a base having a hollow cross section. In various embodiments, when the base is attached to the outer surface of the shaft at a predetermined height, and the pin is depressed into the inner volume of the shaft at a predetermined distance, the distance between the top end of the pin and an end of the base is known.

Devices and systems for track tension measurement and alignment of tracked vehicles are provided. In various embodiments, a device for measuring tension on a continuous track is provided, the device comprising a shaft having a hollow cross section, a pin disposed at least partially through an aperture of the top end of the shaft, a compression member disposed within the inner volume of the shaft, and a base having a hollow cross section. In various embodiments, when the base is attached to the outer surface of the shaft at a predetermined height, and the pin is depressed into the inner volume of the shaft at a predetermined distance, the distance between the top end of the pin and an end of the base is known.

Disclosed herein is a belt tension measuring device utilizing a first end roller, the first end roller supporting the belt; a second end roller having an axis of rotation parallel to the first end roller; a support arm pivotably mounted to pivot about an axis parallel to the axis of rotation of the first end roller; a deflection roller rotatably mounted to the support arm at a distance from the pivot of the support arm; the deflection roller having a rotational axis parallel to the axis of rotation of the first end roller, the roller resting upon the belt, configured to bias the belt against the first roller and second roller; and a position indicator measuring the distance between the axis of the deflection roller and a line drawn between the axis of rotation of the first end roller and the axis of rotation of the second end roller.

Disclosed herein is a belt tension measuring device utilizing a first end roller, the first end roller supporting the belt; a second end roller having an axis of rotation parallel to the first end roller; a support arm pivotably mounted to pivot about an axis parallel to the axis of rotation of the first end roller; a deflection roller rotatably mounted to the support arm at a distance from the pivot of the support arm; the deflection roller having a rotational axis parallel to the axis of rotation of the first end roller, the roller resting upon the belt, configured to bias the belt against the first roller and second roller; and a position indicator measuring the distance between the axis of the deflection roller and a line drawn between the axis of rotation of the first end roller and the axis of rotation of the second end roller.