Abstract

Method for monitoring a free weight system comprising a load bearing member (5) having a sensor (1) mounted thereon, wherein the load bearing member (5) has additionally mounted thereon at least one weight (6) each having a further sensor (1) mounted thereon wherein said sensor (1) comprises an accelerometer (1B) and a gyroscope (1C) and is associated with a weight value, the method comprising the steps of: receiving (403) motion data sets from the sensor (1) and the at least one further sensor; for each of the motion data set correcting (404) acceleration data based on gyroscope data; based on the corrected acceleration data obtained as corrected motion data sets, identifying (405) moving sensors (1); grouping (406), among the moving sensors (1), the sensor (1) with at least one of the at least one further sensor (1) based on the corrected acceleration data being concurrent among the respective corrected motion data sets.

IPC Classes  ?

• A63B 21/ -

Abstract

132m123mm. The length of an arc of the circle covering the marker is determined as Xm, based on the known value Ym. An average circumferential speed is determined based on T1 and T3 and the value of Xm. The circumference is determined by summing said average speed multiplied by T2 with the arc Xm. Finally, the circumferential speed on the circle defined by the sensor and the marker is calculated based on the total time of a complete rotation of the wheel (2) and the calculated circumference of said circle. A corresponding system is also provided.

IPC Classes  ?

• G01P 3/50 - Devices characterised by the use of electric or magnetic means for measuring linear speed
• G01P 3/489 - Digital circuits therefor
• G01P 21/02 - Testing or calibrating of apparatus or devices covered by the other groups of this subclass of speedometers
• G01B 7/12 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring diameters

Abstract

A method for counting spatially arranged, moving markers (120 – 127) wherein said markers (120 – 127) are arranged to move along a movement axis (100) being parallel to a sensors axis (150) of sensors (142 – 146) configured to detect said markers (120 – 127) during movement. According to the method the number of sensors is lower than the number of markers in order to decrease the cost of the sensors system. Further, the present system supports stacks having objects, associated with said markers, of different sizes (e.g. weight plates of increasing height) and/or different weights.

IPC Classes  ?

• A63B 21/062 - User-manipulated weights including guide for vertical array of weights
• G06D 3/00 - Computing devices characterised by the interrelationship of the functional units and having at least one moving part
• G06C 15/04 - Adding or subtracting devices

Abstract

A system for a quantitative detection of a movement, the system comprising: a signal emitter (203) and two signal receivers (202, 204), positioned in series, along a first axis (212) parallel to a second axis of movement (211) of a reflective marker (M), provided on a moving object, wherein the reflective marker (M) is configured to reflect the signal emitted by the emitter (203) towards the receivers (202, 204); wherein the two receivers (202, 204) have a signal reception coverage such that allows existence of a reflective marker (M) position, on the second axis (211), in which the reflective marker (M) of a given size is recognized simultaneously by the two receivers (202, 204). A distance between these parallel axes is D. A distance between the emitter (203) and the receiver (202) is DIE while a distance between the emitter (203) and the receiver (203) is D2E. A signal emitting angle of the emitter (203) is β while a signal reception angle of the receiver (202) is a and a signal reception angle of the receiver (204) is y. In an embodiment, an integrated sensor comprises an emitter (203) typically being an infra-red LED as well as two receivers (202, 204) positioned on a single axis, typically a vertical axis. Another object of the present invention is a weightlifting system comprising a weight stack having at least one weight plate comprising the aforementioned system, wherein the reflective marker is affixed to at least one weight plate.

IPC Classes  ?

• G01S 17/04 - Systems determining the presence of a target
• A63B 21/062 - User-manipulated weights including guide for vertical array of weights