CN112337044A

CN112337044A - Weight adjusting device

Info

Publication number: CN112337044A
Application number: CN201910734342.9A
Authority: CN
Inventors: 王志
Original assignee: Shanxi Xin He Industrial Co ltd
Current assignee: Shanxi Xin He Industrial Co ltd
Priority date: 2019-08-09
Filing date: 2019-08-09
Publication date: 2021-02-09

Abstract

The invention provides a weight adjusting device, which comprises a handle, a transmission mechanism, a motor and a control unit, wherein the handle is connected with the transmission mechanism; the transmission mechanism is at least partially arranged in the handle through hole of the handle and comprises a first rack, a second rack and a first gear, wherein the first rack and the second rack are connected with each other through a connecting gear; the motor drives the first gear to rotate, the connecting gear transmits the motion of the first rack to the second rack, the second rack moves in a mode of equal distance and opposite direction, and the first rack and the second rack can extend out of the handle to be used for supporting the counterweight plate; the control unit is configured to control the motor according to the weight adjustment command. The process of loading the counterweight plates of the weight adjusting device provided by the invention is simple and easy to operate, and the control unit can control the first rack and the second rack to move in a mode of equal distance and opposite directions according to the weight adjusting instruction and respectively extend out of the lengths of the two ends of the handle, so that the number of the locked counterweight plates can be controlled, and the automatic adjustment of the weight is realized.

Description

Weight adjusting device

Technical Field

The present invention relates to the field of exercise equipment, and more particularly to a weight adjustment device, more specifically a dumbbell, whose weight is automatically adjustable.

Background

Along with the development of economy and the improvement of living standard, people pay more and more attention to body building. Dumbbells are widely used as fitness equipment, and the dumbbells on the market are mainly divided into two types: one type of weight is fixed, and the other type of weight is adjustable. The dumbbell with fixed weight needs to be prepared by a user to meet the use requirement by a series of dumbbells with different weight specifications, so that the cost is high and the storage is inconvenient. Compare with the dumbbell of fixed weight, the adjustable dumbbell of weight, the user possess one set of dumbbell can satisfy the exercise demand in different stages, and it is lower to become this, is convenient for again accomodate. Although the existing adjustable dumbbell can realize weight adjustment, the structure is complex, the process of loading dumbbell pieces is complicated, most of dumbbell pieces are manually operated, and the automation degree is not high.

Accordingly, there is a need for a weight adjustment device that at least partially addresses the problems of the prior art.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In order to at least partially solve the above problems, according to an aspect of the present invention, there is provided a weight adjusting device for a weight lifting apparatus, including:

a handle having a handle through-hole extending in an axial direction;

a transmission mechanism disposed at least partially within the handle through-bore, the transmission mechanism including first and second racks connected to one another by a connecting gear, a first gear engaged with the first rack, the first gear being spaced apart from the connecting gear and each having an axis of rotation fixed relative to the handle;

a motor for driving the first gear to rotate so as to move the first rack along the axial direction,

wherein the connecting gear transfers motion of the first rack to the second rack such that the second rack moves in equal distances and in opposite directions, the first and second racks being extendable out of the handle for supporting a weight plate; and

a control unit connected with the motor, the control unit configured to control the motor according to a weight adjustment instruction.

Optionally, the weight adjusting device further comprises a mounting tube disposed in the handle, the mounting tube extending beyond both ends of the handle and having a channel extending in the axial direction, the transmission mechanism being at least partially disposed in the channel.

Optionally, the weight adjusting device further comprises fixing members respectively connected to two ends of the handle, the fixing members are sleeved on the installation pipe and form an accommodating space with the outer peripheral surface of the installation pipe, and the motor and the control unit are both arranged in the accommodating space.

Optionally, the weight adjustment device further comprises a second gear engaged with the second rack, the second gear having another axis of rotation fixed relative to the handle and spaced apart from the connecting gear.

Optionally, the weight-adjusting device further comprises a transmission configured to transmit rotation of the motor to the first gear,

or the first gear is directly arranged on the output shaft of the motor.

Optionally, the weight adjusting device further comprises a position detecting device for detecting the position of the transmission mechanism and generating a position signal, and the position detecting device is connected with the control unit;

and the control unit is configured to control the motor in accordance with the position signal.

Optionally, the control unit is configured to determine that the first rack and the second rack are in respective zero positions or one of a plurality of locking positions according to the position signal.

Optionally, the first rack is provided with positioning holes spaced apart in the axial direction, the position detecting device includes a first transmitting end and a first receiving end facing each other and positioned on opposite sides of the first rack, and the positioning holes are sequentially aligned with a first signal between the first transmitting end and the first receiving end when the first rack moves in the axial direction, and the control unit receives the first position signal.

Optionally, the position detecting device further includes a second transmitting end and a second receiving end facing each other, and the first rack is configured to block a second signal between the second transmitting end and the second receiving end only when the first rack and the second rack are located at a null position, when the control unit does not receive the second position signal.

Optionally, the control unit is configured to determine that the first rack and the second rack are located in a zero position when the first position signal is received but the second position signal is not received.

Optionally, the control unit is configured to calculate a current weight value according to the number of positioning holes between the ending position and the starting position, and feed back information indicating the current weight value to at least one of the operation panel and the external interaction device to display the current weight value.

Optionally, the control unit is configured to control the motor to stop rotating when receiving the first position signal after the motor rotates by a predetermined amount according to a set program, and to control the motor to continue rotating in a forward direction or a reverse direction to calibrate the positions of the first rack and the second rack when the first position signal is not received.

Optionally, the weight adjusting device further comprises a weight plate, and a distance between adjacent positioning holes is smaller than or equal to a thickness of the weight plate.

Optionally, the weight adjustment device further comprises an operation panel provided on the fixing member and electrically connected to the control unit, the operation panel being configured to transmit the weight adjustment instruction to the control unit, and the control unit being further configured to transmit a weight signal and an adjustment status signal to the operation panel.

Optionally, the weight adjusting apparatus further comprises a wireless communication interface configured to wirelessly receive the weight adjusting instruction from an external interaction device and transmit the weight adjusting instruction to the control unit, and the control unit is further configured to transmit a weight signal and an adjustment status signal by connecting to the external interaction device through the wireless communication interface.

Optionally, the weight adjustment device further comprises a hall sensor connected to the control unit, and the control unit is configured to receive a signal from the hall sensor to control the motor to rotate only when the weight adjustment device is placed on the mating base.

Optionally, the weight adjustment device further comprises two auxiliary weight plates connected to the outside of the fixing member, respectively, the auxiliary weight plates having axial through holes coaxial with the passage of the mounting tube and dovetail connection structures attached to adjacent weight plates.

The weight adjusting device provided by the invention has a simple structure, and the process of loading the configuration plate is easy to operate. When the first and second racks are moved axially in equal distances and in opposite directions and extend out of the two ends of the handle, respectively, a desired number of weight plates can be attached and radially locked to the first and second racks to achieve weight adjustability. In the process of weight adjustment, the control unit can control the motor according to the weight adjustment instruction, so that the lengths of the two racks extending out of the two ends of the handle are controlled, the number of the locked weight plates can be adjusted, and the automatic adjustment of the weight is realized.

Drawings

The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles and apparatus of the invention. In the drawings, there is shown in the drawings,

FIG. 1 is a schematic perspective view of a weight adjustment device according to one embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the dumbbell of FIG. 1, with the first and second racks in a null position;

FIG. 3 is another cross-sectional schematic view of the dumbbell of FIG. 1, with the first and second racks in a locked position;

FIG. 4 is a schematic view of the transmission mechanism of FIG. 1;

FIG. 5 is another schematic structural view similar to FIG. 4;

FIG. 6 is a schematic view of a configuration of the first rack and the position sensing device, wherein the first rack is in a locked position;

FIG. 7 is another schematic structural view similar to FIG. 6 with the first rack in a zero position;

FIG. 8 is a perspective view of the position sensing device of FIG. 6;

FIG. 9 is a partial schematic structural view showing the transmission member being a gear according to another embodiment of the present invention;

fig. 10 is a schematic block diagram of the operation steps of the dumbbell.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.

In the following description, for purposes of explanation, specific details are set forth in order to provide a thorough understanding of the present invention. It is apparent that the practice of the invention is not limited to the specific details set forth herein as are known to those of skill in the art. The following detailed description of the preferred embodiments of the present invention, however, the present invention may have other embodiments in addition to the detailed description, and should not be construed as being limited to the embodiments set forth herein.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, as the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. When the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The terms "upper", "lower", "front", "rear", "left", "right" and the like as used herein are for purposes of illustration only and are not limiting.

Ordinal words such as "first" and "second" are referred to herein merely as labels, and do not have any other meaning, such as a particular order, etc. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component".

In the following, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the invention and do not limit the invention.

The invention provides a weight adjusting device for a weight lifting apparatus, and particularly relates to a dumbbell with a weight adjusting structure, which utilizes a motor, a transmission mechanism structure and a control unit to control the movement of a first rack and a second rack of the transmission mechanism in a handle, so that the two racks can simultaneously move towards or away from each other by the same distance along the axial direction. The two racks after movement can extend out of the ends of the handle and extend and retract within the axial channels formed by the axial through-holes of the individual or stacked dumbbell sheets (i.e., weight plates), respectively, to lock the desired number of dumbbell sheets to the ends of the handle. The control unit can control the length of the rack extending out of the two ends of the handle according to the weight adjusting instruction input by the user so as to automatically adjust the number of the locked dumbbell pieces. The control unit allows the user to control the motor using an operating panel on the handle or an external interactive device wirelessly connected to the control unit to enable automatic adjustment of the weight.

The weight adjusting device may be a weight device having a weight plate used for a sporting apparatus such as a barbell, in addition to the above dumbbell. The weight adjustment device is described herein with reference to dumbbells only. It will be appreciated that in the dumbbell embodiment, the weight plates correspond to dumbbell pieces and the auxiliary weight plates correspond to auxiliary dumbbell pieces.

As shown in fig. 1, the weight-adjusting device generally includes a dumbbell 100 and a base 200 detachable from the dumbbell 100. The dumbbell 100 may be placed on the base 200 to support the dumbbell 100 upward and facilitate the weight of the dumbbell 100.

As shown in fig. 2-5, dumbbell 100 includes a handle assembly 110, a drive mechanism 120, and a dumbbell sheet 130. The actuator 120 is disposed within the handle assembly 110, and the actuator 120 is moved by the motor 125. The dumbbell sheets 130 can be radially locked to both ends of the handle assembly 110 by the drive mechanism 120 to achieve the weighting of the dumbbell. The dumbbell 100 further includes a control unit connected to the motor 125, and the control unit controls the motor 125 according to a weight adjustment command input by a user during the weight adjustment process, thereby moving the actuator 120.

The dumbbell 100 includes at least two dumbbell sheets 130 and auxiliary dumbbell sheets 112 attached to each other. It will be appreciated that both the dumbbell plate 130 and the auxiliary dumbbell plate 112 are provided with axial through holes which form axial channels when they are stacked on top of each other. The dumbbell plates 130 and the auxiliary dumbbell plates 112 each have a dovetail connection structure to attach to each other between adjacent dumbbell plates 130, and between adjacent dumbbell plates 130 and auxiliary dumbbell plates 112. The dovetail connection structure can allow them to move radially and prevent them from moving axially.

The handle assembly 110 includes a handle 111 and the auxiliary dumbbell sheet 112 described above. The handle 111 has a handle through-hole extending in the axial direction. The transmission mechanism 120 is at least partially disposed within the handle through-hole. In the illustrated embodiment, a mounting tube 114 is provided within the handle 111. The mounting tube 114 extends beyond both ends of the handle 111 and has an axially extending channel in which the transmission mechanism 120 is at least partially disposed.

The handle assembly 110 further includes fixing members 113 respectively connected to both ends of the handle 111. One side (inner side) of the fixing member 113 is mounted to an end of the handle 111, and the other side (outer side) of the fixing member 113 is connected with the auxiliary dumbbell sheet 112. The dumbbell plates 130 are attached to both ends of the handle assembly 110 by the auxiliary dumbbell plates 112 and the drive mechanism 120. The same number of dumbbell pieces 130 are attached to each end of the handle assembly 110. The attached at least two dumbbell sheets form a group of dumbbell sheets.

Dumbbell 100 is a mirror image structure when viewed from the outside. The first fixing member 113a and the second fixing member 113b have substantially the same structure. For the sake of brevity, only the first fixing member 113a is described herein as an example.

The inner side of the first fixing member 113a has an axial opening coaxial with the passage of the mounting tube 114 so as to be fitted over the mounting tube 114. Alternatively, the first fixing member 113a is a housing having a predetermined axial dimension, and a side (outer side) of the housing facing away from the handle 111 may be open. The auxiliary dumbbell sheet 112 is mounted to the outer side of the first fixing member 113 a. The end of the mounting tube 114 may extend to the inside of the auxiliary dumbbell sheet 112. In an embodiment not shown, the mounting tube 114 may not be provided. The end of the handle 111 may be extended to the inside of the auxiliary dumbbell sheet 112. The first fixing member 113a is directly fitted over the handle 111.

The transmission mechanism 120 includes a first gear 123, a first rack 121a and a second rack 121b connected to each other by a connecting gear 124. The first gear 123 may be coupled to the first rack 121a and have a first rotational axis that is fixed relative to the handle 111 (meaning a fixed position relative to the handle 111). The first gear 123 is rotatable about a first axis of rotation. The connecting gear 124 has a second axis of rotation that is fixed relative to the handle 111. The connecting gear 124 is rotatable about a second axis of rotation.

Specifically, a first rack 121a is movably disposed within the handle through bore and can extend beyond a first end of the handle 111 for supporting the dumbbell sheet 130. The second rack 121b is movably disposed within the handle through-hole and can extend beyond the second end of the handle 111 for supporting the dumbbell sheet 130. The teeth 122 of the first rack 121a and the teeth 122 of the second rack 121b are opposed. The connecting gear 124 transmits the motion of the first rack gear 121a to the second rack gear 121 b. The first and

second racks

121a and 121b are movable in an equal distance and opposite directions in the axial direction with respect to the handle 111.

In the illustrated embodiment, the first rack 121a and the second rack 121b have the same structure and size. The first and

second racks

121a and 121b may be retained within the channel of the mounting tube 114. Optionally, the first and

second racks

121a and 121b each have an end head 128. The shape of the head 128 corresponds to the shape of the axial through hole (see fig. 2) so that during axial movement of the rack, the circumferential surface of the head 128 can abut the hole surface at the axial through hole, or there is a small clearance between the two. In this embodiment, the head portion 128 may function as a guide when the rack is moved. In the illustrated embodiment, the tip portion 128 is circular in cross-sectional shape. The teeth 122 extend into the end head 128.

As shown in fig. 2 to 5, the motor 125 is configured to operatively drive the first gear 123 to rotate so as to move the first rack 121a in the axial direction. The connecting gear 124 is axially spaced from the first gear 123. The connecting gear 124 is disposed between the first and

second racks

121a and 121b, and engages with both the teeth 122 of the first and

second racks

121a and 121 b. The end head 128 may be provided with an inwardly opening recess in which the teeth 122 may be provided to be able to partially receive a corresponding gear.

The fixing member 113 partially forms an accommodating space with the outer circumferential surface of the handle 111. The motor 125 and the control unit (specifically, a circuit board having the control unit embedded therein) are disposed in the accommodating space. The motor 125 and the first gear 123 may be provided together at one of the two fixing members 113, for example, at the first fixing member 113 a. The motor 125 is directly or indirectly connected to the first gear 123.

For example, the first gear 123 is fixedly sleeved on the first rotation shaft L1, and the first rotation shaft L1 defines a first rotation axis. The first rotation shaft L1 extends from the mounting tube 114. An output shaft of the motor 125 is connected to the extended first rotation shaft L1 through a transmission member configured to transmit the rotation of the motor 125 to the first gear 123. Specifically, the output shaft of the motor 125 may be provided with a first transmission 126 a. The first rotating shaft L1 may be provided with a second transmission member 126 b. As shown in fig. 4 and 5, the second transmission member 126b is connected to the first transmission member 126a by a chain or a belt. Alternatively, as shown in fig. 9, in other embodiments, the first transmission piece 126a and the second transmission piece 126b may be gears and engaged with each other. The first gear 123 can be disposed directly on the output shaft of the motor 125 if needed and/or desired.

In one embodiment, the motor 125 is a stepper motor, and the control unit calculates the amount of rotation of the stepper motor based on the weight adjustment command and preset parameters, and sends a pulse signal indicating the amount of rotation to the stepper motor.

Further, the connecting gear 124 is fixedly or rotatably fitted around the second rotation shaft L2, and the second rotation shaft L2 defines a second rotation axis. The mounting tube 114 has a receiving portion for receiving the second rotation shaft L2 to mount the second rotation shaft L2 to the handle 111. The second rotational axis L2 is located approximately at the axial center of the handle assembly 110. The connecting gear 124 may not only transmit the motion of the first rack 121a to the second rack 121b, but also may keep them substantially relatively parallel. The structure of the connecting gear 124 may be the same as that of the first gear 123, so that the connecting gear 124 can be rotated in synchronization with the first gear 123.

Optionally, as shown in fig. 2, the transmission mechanism 120 may further include a second gear 127 engaged with the second rack 121 b. The second gear 127 has a third axis of rotation fixed relative to the handle 111, the second gear 127 being rotatable about the third axis of rotation. The second gear 127 is fixedly or rotatably fitted over a third rotation shaft L3, the third rotation shaft L3 defining a third rotation axis. The third rotation shaft L3 is attached to the handle 111 in substantially the same manner as the connecting gear 124. The connecting gear 124 is disposed between the second gear 127 and the first gear 123. When the second rack 121b moves, the second gear 127 can rotate. The second gear 127 is axially spaced from the connecting gear 124.

In the illustrated embodiment, the second gear 127 is provided at the second fixing member 113 b. The second gear 127 and the first gear 123 are substantially symmetrical with respect to the axial center of the handle 111. The structure of the connecting gear 124 and the structure of the second gear 127 may be the same so that the connecting gear 124 and the second gear 127 can rotate synchronously. Further, referring to fig. 2, centers of the second gear 127, the connecting gear 124, and the first gear 123 may be collinear, so that the first rack 121a and the second rack 121b may be moved without deviating from the axial direction.

The transmission mechanism 120 is further described below with reference to fig. 2-5.

The first and

second racks

121a and 121b are movable between a null position and a lock position, or between different lock positions. Referring to fig. 2, when the racks (i.e., the first rack 121a and the second rack 121b) are in the null position, the racks are located in the handle through-holes and the axial through-holes of the auxiliary dumbbell plate 112, i.e., the tip portions 128 of the racks do not protrude. Referring to fig. 3, when the racks are in the locked position, the end portions 128 of both racks extend out from and into the auxiliary dumbbell sheet 112. The dumbbell sheets 130 mounted to each side of the handle assembly form a group of dumbbell sheets, and the locked position is a locked position corresponding to the group of dumbbell sheets. In other words, the dumbbell sheet set can be fully locked to the rack when the rack is extended to the locked position.

To prevent the racks from being separated from the connecting gear 124 when moving outward in the axial direction, a stopper 129 may be optionally provided at the connecting gear 124, and the first and

second racks

121a and 121b are each provided with an opening extending in the axial direction. A stop 129 is connected to the handle 111 or mounting tube 114 through the opening to block movement of the rack.

Specifically, the motor 125 drives the first gear 123 to rotate in the forward direction, and the first gear 123 drives the first rack 121a to move from its zero position to its locking position. At the same time, the second rack 121b is moved equidistantly from its neutral position to its locked position by the rotation of the connecting gear 124, and the second gear 127 is rotated synchronously during the movement of the second rack 121 b. Similarly, the motor 125 drives the first gear 123 to rotate in reverse, so that the first rack 121a and the second rack 121b move from the respective locked positions to the respective zero positions, at which the racks retract into the mounting tube 114. Of course, the motor 125 can also drive the first gear 123 to rotate in a forward or reverse direction as needed so that the rack can be moved between different locked positions to extend or retract.

The dumbbell 100 also includes a position detection device 150 connected to the control unit. The position detecting device 150 is used for detecting the position of the transmission mechanism 120 and generating a position signal. The control unit is capable of controlling the motor 125 in dependence on the position signal. The position detection device and the control unit are described below with reference to fig. 4 to 7.

The control unit is configured to determine that the first and

second racks

121a and 121b are in the respective zero position or one of the plurality of locking positions according to the position signal. The control unit is a program control system embedded in the circuit board 11. The fixing member 113 is provided with an operation panel 12 connected to the circuit board 11, which has a display screen and an input portion such as a button or touch key. The user can input a weight adjustment instruction to the motor 125 through the operation panel 12, the operation panel 12 can transmit the weight adjustment instruction to the control unit, and the control unit can transmit a weight signal and an adjustment state signal to the operation panel 12. The control unit is connected to the motor 125 and configured such that the first and

second racks

121a and 121b move by a predetermined distance when the motor 125 rotates in a forward or reverse direction by a predetermined angular displacement. Movement of the rack a predetermined distance may cause the rack to move between adjacent locking positions, or a null position and a locking position adjacent thereto.

The first rack 121a is provided with positioning holes 141 spaced apart in the axial direction. The positioning hole 141 is a through hole provided at the tooth and extending in the radial direction. The distance between adjacent positioning holes 141 is less than or equal to the thickness of the dumbbell sheet 130.

The position detection device 150 may be disposed radially outward of the mounting tube 114, for example, on the annular circuit board 13. The mounting pipe 114 is provided with a through hole 115 (see fig. 9) for allowing a signal to pass therethrough at a position corresponding to the position detecting device 150. The position detecting device 150 can cooperate with the positioning hole 141 of the first rack 121a to generate a first position signal. It should be noted that, in the illustrated embodiment, although both the first rack gear 121a and the second rack gear 121b are shown to have the positioning hole 141, only the positioning hole 141 of the first rack gear 121a is used for precise positioning. The positioning holes 141 located on the outermost side correspond to signals indicating the zero position (fig. 7), and the remaining positioning holes 141 correspond one-to-one to signals indicating different lock positions.

The control unit can receive the first position signal of the position detecting device 150 to control the rotation of the motor 125. The motor 125 moves the two racks to the designated positions according to the program set in the control unit, and in order to overcome the possibility that the two racks deviate from the designated positions due to the program controlling the motor 125, the positions of the two racks are calibrated by the position detecting device 150. Specifically, the position detecting device 150 includes a first transmitting end 151 and a first receiving end 152 (fig. 8) facing each other and positioned on opposite sides of the first rack 121 a. The first transmitting terminal 151 can transmit a first signal all the way to the first receiving terminal 152 (after the dumbbell is activated). The first signal emitted from the first emitting end 151 can pass through the positioning hole 141 to be received by the first receiving end 152. When the first rack gear 121a moves in the axial direction, the positioning hole 141 is sequentially aligned with the first signal between the first emitting end 151 and the first receiving end 152, and the control unit receives the first position signal, and the rack gear is located at the designated position. When the control unit does not receive the first position signal, the rack does not reach or exceeds the specified position.

After the motor 125 rotates by a predetermined amount according to a set program to move the two racks toward the designated position, the control unit controls the motor 125 to stop rotating when receiving the first position signal, and controls the motor 125 to continue to rotate in the forward or reverse direction when not receiving the first position signal, so that the racks continue to move toward the designated position until the designated position is stopped. Whether the motor 125 is finally stopped is controlled by whether the control unit can receive the first signal. The control unit is configured to be able to determine that the motor 125 should be rotated in the forward or reverse direction to move the racks further toward the specified position when the two racks deviate from the specified position. It will be appreciated that the designated position corresponds to the locked or zero position of the positioning aperture 141.

In the present embodiment, as shown in fig. 6, the tip end portion 128 protrudes from the rack body 142 in the radial direction. The positioning hole 141 located on the outermost side is arranged at the tip end portion 128, and the remaining positioning holes 141 are provided on the rack body 142.

The position detecting device 150 further includes a second transmitting terminal 153 and a second receiving terminal 154 (fig. 8) facing each other, the second transmitting terminal 153 being capable of transmitting a second signal to the second receiving terminal 154 at all times to generate a second position signal. The first rack 121a is configured to block the second signal between the second transmitting terminal 153 and the second receiving terminal 154 only when the first rack 121a and the second rack 121b are located at the zero position, when the control unit does not receive the second position signal. The second signal can be blocked by the portion of the tip portion 128 protruding from the rack body 142, but not by the rack body 142 because the cross-sectional shape of the rack body 142 is less than half of the circle defined by the mounting tube 114. In other words, the second signal is always in communication when the two racks are moved toward either of the locked positions, and is blocked when the two racks are near or at the zero position.

The control unit is configured to determine that the first and

second gear racks

121a and 121b are in the zero position when the first position signal is received but the second position signal is not received. The zero position is determined for initial accurate counting and the dumbbell sheet 130 can be completely removed from the handle assembly 110 as needed.

Alternatively, the first emitting end 151 and the first receiving end 152, and the second emitting end 153 and the second receiving end 154 may be infrared pair tubes. The position detection device 150 may also be other position detection devices such as position encoders using optical or magnetic signals.

The control unit may be further configured to calculate the current weight value according to the number of the positioning holes 141 between the ending position and the starting position of the first rack gear 121 a. Current weight value W_eCorresponding to the end position, a preceding weight value W₀Corresponding to the starting position. The control unit can determine the number N of the positioning holes 141 through which the first rack 121a moves each time according to the first position signal. The number of dumbbell pieces 130 attached is the same as the number of locating holes 141, also N. The weight of the pair of dumbbell pieces 130 is a predetermined value W_i。

(ii) a Wherein, W_iThe value range of i is 1-N for the weight of the dumbbell piece in the ith pair.

Specifically, when both the first and second rack gears 121a and 121b are moved (extended) outward, and the control unit determines the number N of passing positioning holes 141, the forward count at this time, the previous weight value is increased by N predetermined values. When both the first and second rack gears 121a and 121b are moved inward (retracted) and the control unit determines the number N of passing positioning holes 141, counting in reverse at this time, the previous weight value is decreased by N predetermined values. Both the predetermined value and the current weight value can be displayed on the display screen of the operation panel 12 for easy observation by the user.

The control unit is configured to calculate the current weight value on the basis of the weight value at the time of the previous shutdown. In other words, the control unit can save the weight value at each time of shutdown, and at the next time of startup, the control unit first judges whether the motor 125 is to be rotated in the forward direction or in the reverse direction according to the weight adjustment instruction, thereby automatically responding to the forward or reverse counting, and calculates the current weight value after executing a new instruction based on the weight value at the previous time of shutdown.

The operation of dumbbell 100 is described below with reference to fig. 10.

The user may input a weight adjustment instruction, such as setting to increase or decrease the number of dumbbell pieces 130 to be locked, using the operation panel 12 on the dumbbell 100 and transmit the instruction to the control unit (operation S1). The control unit transmits a control signal to the motor 125 based on the weight adjustment command to move the rack (operation S2). When the rack is moved, the signal generated by the position detecting device 150 can be blocked or communicated by the rack (operation S3). The position detecting device 150 feeds back the generated position signal indicating the rack position information to the control unit (operation S4). The control unit sends another control signal to the motor 125 according to the position signal to calibrate the positions of the first and

second racks

121a and 121b (operation S5). The control unit transmits information about the real-time state of the dumbbell 100 (e.g., a weight signal such as a current weight value, an adjustment state signal such as confirmation/cancellation, etc.) to the operation panel 12 to display the information (operation S6).

Further, the circuit board 11 may be provided thereon with a wireless communication interface, such as a bluetooth interface, which is capable of wirelessly receiving a weight adjustment instruction from an external interaction device, such as a mobile phone, a tablet computer, etc., and transmitting the weight adjustment instruction to the control unit, and the control unit may be capable of connecting to the external interaction device through the wireless communication interface to transmit a weight signal and an adjustment status signal. The user may choose to enter a weight adjustment command using software on the external interaction device, such as setting up an increase or decrease in the number of dumbbell pieces 130 to be locked, and send the command to the control unit (operation S1'). The control unit may transmit information about the real-time state of the dumbbell 100 to the external interacting device to display the information (operation S6').

Further, in one embodiment, the dumbbell 100 may also include hall sensors connected to a control unit configured to receive signals from the hall sensors to control the rotation of the motor 125 only when the weight adjustment device is placed. Specifically, the base 200 is provided with a magnet, the hall sensor can sense the magnetic field generated by the magnet and generate a signal only when the dumbbell 100 is placed on the base 200, the motor 125 is powered on with the built-in power supply 14 according to the signal of the hall sensor, and the control unit can also receive the signal of the hall sensor, thereby judging whether the dumbbell 100 is placed on the base 200. With this embodiment, when the user moves the dumbbell 100, the motor can be prevented from being operated by accidental touching or misoperation, and the probability of potential safety hazards can be reduced.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "part," "member," and the like, when used herein, can refer to either a single part or a combination of parts. Terms such as "mounted," "disposed," and the like, as used herein, may refer to one component as being directly attached to another component or one component as being attached to another component through intervening components. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A weight adjustment device for a weight lifting apparatus, comprising:

a handle having a handle through-hole extending in an axial direction;

2. The weight adjustment device of claim 1, further comprising a mounting tube disposed within the handle, the mounting tube extending beyond both ends of the handle and having a channel extending in the axial direction, the transmission mechanism being at least partially disposed within the channel.

3. The weight adjusting apparatus as claimed in claim 2, further comprising fixing members respectively connected to both ends of the handle, the fixing members being fitted over the mounting pipe and forming an accommodating space with an outer circumferential surface of the mounting pipe, the motor and the control unit being disposed in the accommodating space.

4. The weight adjustment device of claim 1, further comprising a second gear engaged with the second rack, the second gear having another axis of rotation fixed relative to the handle and spaced apart from the connecting gear.

5. The weight adjustment device of claim 1,

further comprising a transmission configured to transmit rotation of the motor to the first gear,

or the first gear is directly arranged on the output shaft of the motor.

6. The weight adjustment device of claim 1,

the device also comprises a position detection device, a control unit and a control unit, wherein the position detection device is used for detecting the position of the transmission mechanism and generating a position signal;

7. The weight adjustment device of claim 6, wherein the control unit is configured to determine that the first and second racks are in respective zero positions or one of a plurality of locked positions based on the position signal.

8. The weight adjustment device of claim 6, wherein the first rack is provided with positioning holes spaced apart in the axial direction, the position detection device includes a first transmitting end and a first receiving end facing each other and positioned on opposite sides of the first rack, and the positioning holes are sequentially aligned with a first signal between the first transmitting end and the first receiving end when the first rack is moved in the axial direction, and the control unit receives the first position signal.

9. The weight adjustment device of claim 8, wherein the position detection device further comprises a second transmitting end and a second receiving end facing each other, the first rack being configured to block a second signal between the second transmitting end and the second receiving end only when the first rack and the second rack are in a null position when the control unit does not receive a second position signal.

10. The weight adjustment device of claim 9, wherein the control unit is configured to determine that the first and second racks are in a null position when the first position signal is received but the second position signal is not received.

11. The weight adjustment apparatus of claim 8, wherein the control unit is configured to calculate a current weight value according to the number of positioning holes between the end position and the start position, and feed back information indicating the current weight value to at least one of an operation panel and an external interactive device to display the current weight value.

12. The weight adjustment device of claim 8, wherein the control unit is configured to control the motor to stop rotating when receiving the first position signal after the motor rotates by a predetermined amount according to a set program, and to control the motor to continue rotating in a forward direction or a reverse direction to calibrate the positions of the first and second racks when not receiving the first position signal.

13. The weight adjustment device of claim 8, further comprising a weight plate, wherein a distance between adjacent positioning holes is less than or equal to a thickness of the weight plate.

14. The weight adjustment device according to claim 3, further comprising an operation panel provided on the fixing member and electrically connected to the control unit, the operation panel being configured to transmit the weight adjustment instruction to the control unit, and the control unit being further configured to transmit a weight signal and an adjustment state signal to the operation panel.

15. The weight adjustment apparatus of claim 1, further comprising a wireless communication interface configured to wirelessly receive the weight adjustment instruction from an external interaction device and transmit the weight adjustment instruction to the control unit, and the control unit is further configured to transmit a weight signal and an adjustment status signal by connecting to the external interaction device through the wireless communication interface.

16. The weight adjustment device of claim 1, further comprising a hall sensor coupled to the control unit, the control unit configured to receive a signal from the hall sensor to control the motor to rotate only when the weight adjustment device is placed on a mating base.

17. The weight adjustment device of claim 3, further comprising two auxiliary weight plates connected to an outer side of the fixation member, respectively, the auxiliary weight plates having an axial through-hole coaxial with the channel of the mounting tube and a dovetail connection structure attached to an adjacent weight plate.