Start assist device for swimmers with positioning and removal mechanism

Abstract

An apparatus to quickly position a start assist device for backstroke swimmers and remove said start assist device once the apparatus detects or is signaled that the swimmer has left to prevent injuries and obstructions caused by the start assist device. A mechanical embodiment of such an apparatus and a motorized embodiment of such an apparatus with a data input system to position the start assist device according to the individual swimmers needs and means to signal the start event are disclosed.

Claims

1. A starting assist apparatus for assisting backstroke swimmers during a start process, the apparatus comprising: a footrest operable for positioning in a pool during the start process and automatic removal from the pool after the start process, wherein the positioning in the pool corresponds with an extended position of the footrest and the automatic removal from the pool corresponds with a retracted position of the footrest; a rotatable winding tube comprising a torsion spring configured to provide a bias force to the rotatable winding tube in a first direction corresponding with the retracted position of the footrest; a plurality of straps coupling the footrest to the rotatable winding tube, the plurality of straps configured to simultaneously wind around the rotatable winding tube if the rotatable winding tube is rotated in the first direction, the plurality of straps configured to simultaneously unwind from the rotatable winding tube if the rotatable winding tube is rotated in the second direction, wherein: a force applied to the rotatable winding tube in a second direction that exceeds the bias force provided by the torsion spring in the first direction rotates the rotatable winding tube in the second direction to simultaneously unwind the plurality of straps to move the footrest to the extended position, and the bias force provided by the torsion spring in the first direction automatically and simultaneously winds the plurality of straps on the rotatable winding tube to move the footrest to the retracted position in an absence of the force applied to the rotatable winding tube in the second direction that exceeds the bias force provided by the torsion spring in the first direction; and a lock operable to receive a user actuation to a closed position to set the extended position of the footrest in the pool at a user-selected position, wherein the user actuation of the lock to the closed position prevents rotation of the winding tube in the second direction to unwind the plurality of straps and allows rotation of the winding tube in the first direction to wind the plurality of straps.

2. The apparatus according to claim 1, wherein the lock is configured to allow rotation of the rotatable winding tube in the first direction and the second direction to respectively wind and unwind the plurality of straps if the lock is in an open position.

3. The apparatus according to claim 1, wherein the rotation of the rotatable winding tube in the first direction to automatically and simultaneously wind the plurality of straps is slowed by the lock if the lock is in the closed position.

4. The apparatus according to claim 3, comprising a ratchet coupled to the rotatable winding tube and configured to interface with the lock.

5. The apparatus according to claim 4, wherein the ratchet comprises a plurality of teeth, and wherein the lock slows the rotation of the rotatable winding tube by clicking into the plurality of teeth of the ratchet as the rotatable winding tube rotates in the first direction to automatically and simultaneously wind the plurality of straps.

6. The apparatus according to claim 1, wherein: the rotatable winding tube comprises a plurality of openings, each of the openings comprising a narrow opening portion contiguous with a wider opening portion, and each of the plurality of straps comprises an attachment mechanism configured for insertion into the wider opening portion and sliding to the narrow opening portion of one of the plurality of openings of the rotatable winding tube to couple each of the plurality of straps to the rotatable winding tube.

7. The apparatus according to claim 1, comprising a wheel coupled to the rotatable winding tube configured to manually rotate the rotatable winding tube in one or both of the first direction and the second direction.

8. The apparatus according to claim 1, comprising a mounting bracket configured to mount the apparatus to a post of a starting block.

9. A plurality of starting assist apparatuses for assisting backstroke swimmers during a start process, each of the plurality of starting assist apparatuses comprising: a footrest operable for positioning in a pool during the start process and automatic removal from the pool after the start process, wherein the positioning in the pool corresponds with an extended position of the footrest and the automatic removal from the pool corresponds with a retracted position of the footrest; a rotatable winding tube comprising a torsion spring configured to provide a bias force to the rotatable winding tube in a first direction corresponding with the retracted position of the footrest; a plurality of straps coupling the footrest to the rotatable winding tube, the plurality of straps configured to simultaneously wind around the rotatable winding tube if the rotatable winding tube is rotated in the first direction, the plurality of straps configured to simultaneously unwind from the rotatable winding tube if the rotatable winding tube is rotated in the second direction, wherein: a force applied to the rotatable winding tube in a second direction that exceeds the bias force provided by the torsion spring in the first direction rotates the rotatable winding tube in the second direction to simultaneously unwind the plurality of straps to move the footrest to the extended position, and the bias force provided by the torsion spring in the first direction automatically and simultaneously winds the plurality of straps on the rotatable winding tube to move the footrest to the retracted position in an absence of the force applied to the rotatable winding tube in the second direction that exceeds the bias force provided by the torsion spring in the first direction; and a lock operable to receive a user actuation to a closed position to set the extended position of the footrest in the pool at a user-selected position, wherein the user actuation of the lock to the closed position prevents rotation of the winding tube in the second direction to unwind the plurality of straps and allows rotation of the winding tube in the first direction to wind the plurality of straps, wherein each of the plurality of starting assist apparatuses is coupled to one or more other of the plurality of starting assist apparatuses by a bar.

10. Each of the plurality of starting assist apparatuses according to claim 9, wherein the lock is configured to allow rotation of the rotatable winding tube in the first direction and the second direction to respectively wind and unwind the plurality of straps if the lock is in an open position.

11. Each of the plurality of starting assist apparatuses according to claim 9, wherein the rotation of the rotatable winding tube in the first direction to automatically and simultaneously wind the plurality of straps is slowed by the lock if the lock is in the closed position.

12. Each of the plurality of starting assist apparatuses according to claim 11, comprising a ratchet coupled to the rotatable winding tube and configured to interface with the lock.

13. Each of the plurality of starting assist apparatuses according to claim 12, wherein the ratchet comprises a plurality of teeth, and wherein the lock slows the rotation of the rotatable winding tube by clicking into the plurality of teeth of the ratchet as the rotatable winding tube rotates in the first direction to automatically and simultaneously wind the plurality of straps.

14. Each of the plurality of starting assist apparatuses according to claim 9, wherein: the rotatable winding tube comprises a plurality of openings, each of the openings comprising a narrow opening portion contiguous with a wider opening portion, and each of the plurality of straps comprises an attachment mechanism configured for insertion into the wider opening portion and sliding to the narrow opening portion of one of the plurality of openings of the rotatable winding tube to couple each of the plurality of straps to the rotatable winding tube.

15. Each of the plurality of starting assist apparatuses according to claim 9, comprising a wheel coupled to the rotatable winding tube configured to manually rotate the rotatable winding tube in one or both of the first direction and the second direction.

16. Each of the plurality of starting assist apparatuses according to claim 9, comprising a mounting bracket configured to mount the apparatus to a post of a starting block.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1A is a top view of a starting backstroke swimmer with the projection of the start forces shown.

(2) FIG. 1B is an underwater side view of a backstroke swimmer preparing for a start with the projection of the start forces shown, showing the angles and the vertical start forces.

(3) FIG. 1C is a force diagram of FIG. 1B showing the vertical and horizontal components of one start force, for example the force of the right leg.

(4) FIG. 1D shows how the forces of the right and left leg are transferred into a start assist device.

(5) FIG. 2 shows the device in perspective view with wound up foot rest and closed lock.

(6) FIG. 3 shows the device in perspective view with wound down foot rest and open lock.

(7) FIG. 4 shows a sectional view of the device showing the wound down footrest, the ratchet and the open lock during the positioning process.

(8) FIG. 5 shows the device in perspective view without cover with closed lock.

(9) FIG. 6 shows a sectional view of the device showing the closed lock and the device rewinding.

(10) FIG. 7 shows the winding tube with ratchet and torsion spring.

(11) FIG. 8 shows the winding tube in a sectional view with the inserted strap end to affix the strap.

(12) FIG. 9 shows a motorized apparatus with its control components.

(13) FIG. 10 shows a motorized apparatus with various detection components.

(14) FIG. 11 shows two devices mounted on a pool deck, affixed on starting block posts and connected together with a bar.

BEST MODE FOR CARRYING OUT THE INVENTION

(15) FIG. 1A shows a top view (photo credit pinterest.com) of a starting backstroke swimmer 1 in the water 4 with the start force projection of the right leg 5 and the start force projection of the left leg 6 drawn into the picture. The start forces 5 and 6 in the horizontal plane are essentially perpendicular to the timing touch pad 2 and pool wall 3. As soon as the swimmer has left the start assist device it needs to be removed from the timing touch pad 2 and the pool wall 3 so that a swimmer who comes back in his or her lane does not hurt him- or herself on the protrusion while doing a backstroke turn or reaching the wall and that a timing touch pad 2 is not obstructed to register a touch signaling the end of a race.

(16) FIG. 1B shows the underwater side view (photo credit Goswim.tv) of a starting swimmer with the projection of the start forces 5 and 6 drawn into the picture. The start forces 5 and 6 are at angles 7 and 8 of less than 90 degrees to the pool wall 3 (no timing touch pad 2 is installed in this picture), which results in a vertical component of the start force 10 as described in FIG. 1C.

(17) FIG. 1C is a force triangle of the resultant start force of the right leg 5 at the angle 7 resulting in a perpendicular force component 9 and a vertical force component 10. The vertical force component 10 parallel to the pool wall 3 provides the danger of slipping if only transferred into the pool wall 3 by friction.

(18) FIG. 1D shows the start force of the right leg 5 and the start force of the left leg 6 going into a backstroke start assist device foot rest 11 with straps 12, thus preventing slipping in vertical direction on the pool wall 3. The device bears the vertical force components of the resultant start forces 5 and 6 which come through the straps and transfers them into the pool deck. The perpendicular components are transferred directly into the pool wall 3 or timing touchpad 2.

(19) FIG. 2 shows a preferred embodiment of the present invention 13 with the foot rest 11 in the fully removed position from the water 4, thus clearing the pool wall 3 (or a timing touch pad 2, here not shown) from the protrusion of the foot rest 11. It further shows the lock 14 in closed position and an example of a post of a starting block 20 and a mounting bracket 21 mounted to the device 13, which connects the device 13 through means such as Velcro hook and loop fasteners to the post of the starting block 20.

(20) FIG. 3 shows a preferred embodiment of the present invention with the lock 14 in the open position and the foot rest 11 pulled down into the water 4 which exposes the positioning means, for example straps 12. In this position the footrest 11 creates a protrusion on the pool wall 3.

(21) FIG. 4 shows that with the open lock 14 the ratchet 15 can turn in either direction, thus allowing the straps 12 to wind or unwind on the winding tube 16 which leads to different positions of the foot rest 11 relative to the water level, as individually desired by the swimmer. The positioning process can be accomplished quickly either by pulling more or less on the footrest 11 or by manually turning the wheel 19 as shown in FIG. 7. It needs to be noted that according to FIG. 7 inside the winding tube 16 a torsion spring 17 or a similar means is located which winds up when the straps become unwound from the winding tube 16. That creates a pulling force on the foot rest 11 which the swimmer has to overcome during the positioning process to inform the device that he or she is present.

(22) FIG. 5 shows the device without the protective cover to expose the functions inside. Once the foot rest 11 is positioned at the desired height, the swimmer has to hold it down against the winding force of the torsion spring 17 and flip the lock 14 into the closed position to lock the ratchet 15. That prevents the winding tube 16 from further unwinding the straps 12. The swimmer can then put his or her feet on the foot rest 11 and as long as the holding force of the swimmer on the foot rest is larger than the rewinding force the device recognizes that the swimmer is present and the position of the footrest 11 stays in place. In this position the swimmer can perform a start without the fear of slipping because the vertical forces 10 are transferred from the foot rest 11 through the straps through the locked ratchet 15 into the device into the pool deck.

(23) FIG. 6 shows that once the swimmer has left the footrest 11, the holding force of the swimmer on the foot rest is removed, the device recognizes that the swimmer is not present and the rewind force of the torsion spring 17 causes the ratchet 15 with the winding tube 16 to turn in the indicated direction that the lock allows. The lock 14 clicks from one ratchet tooth into the next ratchet tooth which slows down the turning speed of the ratchet, a desired effect to control the speed of the rewinding process. The straps 12 are wound up and the footrest 11 is pulled out of the water 4 away from the pool wall 3. The end position of the device is the same as shown in FIG. 2, where the straps 12 are completely wound up on the winding tube 16 up by the force of the torsion spring 17 and the footrest 11 is completely removed from the pool wall 3.

(24) The wound up position of FIG. 2 allows the swimmer to do backstroke turns or hit a timing touchpad to end a race without interference of the foot rest 11.

(25) FIG. 7 shows the details of the winding tube 16 with the attached ratchet 15 and hand wheel 19. The hand wheel 19 is an additional means to manually wind up the winch should a failure occur or to manually position the foot rest. Inside the tube is the torsion spring 17 which is connected to the winding tube assembly on the side with the ratchet 15. In the assembled device 13 the axle 22 goes through the chassis of the device. The other side of said torsion spring 17 is affixed to the chassis so that when the winding tube assembly is turned the torsion spring becomes either wound or unwound, thus creating the winding force to position the footrest 11.

(26) FIG. 8 shows a preferred embodiment of how the straps 12 are affixed to the winding tube 16. The straps 12 have a small bar 23 or such affixed, for example sewn in, to the effect that the thickness of the strap is locally increased. This thicker part is inserted into the winding tube 16 through the wider part of one of the openings 18 and then pushed towards the narrower part of the opening. This effectively locks the strap in place to bear the winding forces. The wider part of the openings 18 are then covered to prevent the straps from wandering back out through the wider part of the openings during operation.

(27) FIG. 9 shows another preferred embodiment of the apparatus contemplated, including a motorized winch to control the length of the positioning means. The motor 24 is connected to the winding tube 16 and to a power supply (not shown) and a motor control data processing system 25 with inputs described below to control the winding, holding and unwinding of the motor 24 and thus the length of the positioning means 12, which in turn controls the position of the foot supporting means 11.

(28) A data interface 26 to communicate the information about the individual positioning of the foot rest 11 is connected to the motor control data processing system 25. The data interface can accept information by manual input or through an electronic data interface 27 to another, external data processing system 28 such as an automated swimming system or a computer with a meet manager application via data channels known in the art such as serial data lines, CAN bus, USB, wireless data lines or other embodiments of such data channels, and can display the status of the device for example with LEDs. Thus the positioning information of an individual swimmer can be transmitted to the motor 24 either manually for example by the swimmer or automatically through the connected external data processing system 28.

(29) Means to detect the status of the apparatus are arranged and connected to the motor data processing system. They detect if a swimmer is on the device, is starting, has left the device and the position of the foot supporting means.

(30) A preferred embodiment to detect if a swimmer is on the device, is starting or has left the device is a torque measurement system 29 integrated into the winch as known in the art which detects if the swimmer exudes holding forces, start forces or if the holding forces have vanished. Depending on the state the motor 24 holds when the swimmer is on the device or starts and winds the positioning means 12 when it detected that the swimmer has left. Other contemplated embodiments are force detectors on the foot supporting means 11 or on the positioning means 12, detectors 30 if the feet of the swimmer are on the foot supporting means 11 or such.

(31) Means to detect the position of the foot supporting means 11 such as a step counter in the motor control in conjunction with an end detector of the positioning means 12, a length measurement of the positioning means 12 such as marks in the positioning means or such are connected to the motor control data processing system 25 to allow a meaningful positioning of the foot supporting means 11.

(32) The motor control data processing system 25 takes all the inputs and processes them to control the position of the foot supporting means 11 during the various states of the apparatus. The process starts with the foot supporting means 11 being out of the way of the swimmer, for example wound up on the pool deck or wound down to the pool bottom. The swimmer approaches the apparatus and either inputs the desired positioning information himself or herself into the data interface 26, for example inch below the water surface, or said information is transmitted from an external data processing system 28 with knowledge who the swimmer is and what positioning value he or she needs. In the next step the motor 24 sets the desired position of the foot supporting means 11. The swimmer mounts the foot supporting means 11, the detection mechanism 29 or 30 detects and reports to the motor control data information system the mounting state. The swimmer starts and the detection mechanism 29 or 30 detects and reports to the motor control data processing system 25 the starting state. During both preceding states the motor 24 holds the foot supporting means 11 steady. Once the swimmer has left, the detection mechanism reports this state to the motor control data processing system 25 and the motor 24 positions with the help of said positioning means 12 the foot supporting means 11 out of the way of the swimmer as described above.

(33) FIG. 10 shows a motorized device with a detection unit for a start tone 32, a detection unit for a visual start signal 33, the input from the external timing system 28 to signal a start event and a manual input unit 34. Either of the detection unit 32 or the detection unit 33 or both, or a signal from the external timing system 28 can be used to signal the motor control unit 25 that the start has occurred, that the swimmer is not expected to be present anymore after a delay time (for example 6 seconds) and therefore the motor 24 can move the positioning means 12 by turning the winding tube 16 to remove the foot supporting means 11 after that delay time. In the case of an inferred detection it is advisable to have safety means in place to prevent injury or startling of the swimmer by suddenly and unexpectedly moving the foot supporting means. The safety means could be detection means as shown in FIG. 9. Their signals would let the motor hold the foot supporting means 11 in place as long as they detect a swimmer, overriding a start signal or positioning signal to the motor. A manual input 34, operated by a person, can be used to signal to the motor control data processing system 25 that the swimmer is not present anymore, either because of a start or for any other reason, and the motor 24 can remove the foot supporting means 11 through the positioning means 12. A signal from a timing touchpad 2 connected to a swim timing system 28 can be used to determine when a swimmer has left. In one embodiment the timing touchpad 2 gets pressed by the foot supporting means 11 as long as the swimmer exudes forces during the holding and starting phase, and the signals from said timing touchpad 2 get processed by the swim timing system 28 which in turn sends a command to move the foot supporting means 11 through the interface 27 to the apparatus.

(34) FIG. 11 shows two devices 13 mounted on a pool deck, close to the edge of the deck and with the foot supporting means 11 hanging into the water 4 via the positioning means 12. In this example each of them is connected through a bracket 21 to the post 20 of a starting block. Both devices are connected through a bar 31 to provide a stable mounting, should the forces of a swimmer coming through the positioning means 12 not be exactly equal. The bar 31 creates for each device in essence two mounting points which prevents a turning or swaying of a device 13, which would lead to a slipping of a foot supporting means 11.

(35) The disclosed embodiments are representative of presently preferred forms of the invention, but are understood to be illustrative rather than definitive of the invention.