TWI848539B - Portable electronic device - Google Patents

Abstract

A portable electronic device including a display body, a base, a stand and a switch mechanism is provided. The stand is disposed between the display body and the base, and has a first end and a second end opposite to each other. The first end of the stand is pivotally connected to the base, and the second end of the stand is pivotally connected to the display body. The base is provided with a positioning part corresponding to the stand. The switch mechanism is disposed at the stand and is coupled to the display body. The switch mechanism includes a positioning member, and the positioning member is engaged with the positioning part. During a process that the display body rotates to a first angle relative to the second end of the stand, the switch mechanism is driven by the display body, so that the positioning member is separated from the positioning part.

Description

Portable electronic devices

The present invention relates to an electronic device, and in particular to a portable electronic device.

Tablet computers are common portable electronic devices that can provide larger display screens or operation screens, and have become an important tool for modern people in work or life. Generally speaking, the common operation method of tablet computers is handheld operation, but over a long period of time, it causes a great burden to the user. Therefore, a design of integrating a stand into a tablet computer has been proposed. In detail, the user must manually flip the stand to unfold the stand relative to the tablet computer so that the tablet computer can stand on the work surface through the stand. In addition, the user can only increase or decrease the unfolding angle between the tablet computer and the stand to adjust the viewing angle of the tablet computer, and cannot adjust the viewing height of the tablet computer. In other words, the design of the stand commonly integrated into the tablet computer is relatively insufficient in terms of operational mobility and convenience.

The present invention provides a portable electronic device with excellent operational mobility and convenience.

The present invention proposes a portable electronic device, including a display body, a base, a bracket and a switch mechanism. The bracket is arranged between the display body and the base, and has a first end and a second end opposite to each other. The first end of the bracket is pivoted to the base, and the second end of the bracket is pivoted to the display body. The base is provided with a positioning part corresponding to the bracket. The switch mechanism is arranged on the bracket and coupled to the display. The switch mechanism includes a positioning member, and the positioning member is engaged with the positioning member. When the display body rotates to a first angle relative to the second end of the bracket, the switch mechanism is driven by the display body, so that the positioning member is separated from the positioning member.

In one embodiment of the present invention, the portable electronic device further includes a torsion spring. One end of the torsion spring is connected to the first end of the bracket. After the positioning member is separated from the positioning portion, the torsion spring drives the bracket to rotate and rise to a second angle relative to the base.

In one embodiment of the present invention, the positioning portion of the base is arranged corresponding to the second end of the bracket, and the switch mechanism is arranged at the second end of the bracket.

In one embodiment of the present invention, the portable electronic device further includes a rotating shaft fixed to the base. The first end of the bracket is pivoted to the rotating shaft, and the other end of the torsion spring is connected to the rotating shaft.

In one embodiment of the present invention, the portable electronic device further includes a rotating shaft. The rotating shaft is fixedly connected to the display body and pivotally connected to the second end of the bracket, wherein the display body is coupled to the switch mechanism through the rotating shaft.

In one embodiment of the present invention, the above-mentioned shaft includes a rod and a driving part connected to the rod, and the switch mechanism further includes a follower slidably sleeved on the rod. The follower contacts the driving part and is connected to the positioning part.

In one embodiment of the present invention, the driving portion has a driving surface facing the follower, and the follower has a follower surface contacting the driving surface.

In one embodiment of the present invention, the driving surface and the driven surface are two concave and convex surfaces that cooperate with each other.

In one embodiment of the present invention, the above-mentioned rotating shaft further includes a limiting portion connecting the rod portion, and the limiting portion and the driving portion are arranged opposite to each other. The follower is slidably arranged between the driving portion and the limiting portion.

In one embodiment of the present invention, the switch mechanism further includes a compression spring sleeved on the rod. The opposite ends of the compression spring contact the follower and the limiter respectively.

In one embodiment of the present invention, the portable electronic device further includes a fixing frame. The fixing frame is fixed to the second end of the bracket, wherein the fixing frame has a sleeve portion, and the sleeve portion is sleeved on the rotating shaft.

In one embodiment of the present invention, when the display body is rotated and lifted relative to the bracket, the shaft and the sleeve part rotate relative to each other and generate a first torque. When the display body is rotated and lowered relative to the bracket, the shaft and the sleeve part rotate relative to each other and generate a second torque greater than the first torque.

In one embodiment of the present invention, the base is provided with two opposite positioning parts corresponding to the bracket, and the switch mechanism includes a gear and two positioning members arranged opposite to each other. The two positioning members are respectively engaged with the two positioning parts. The gear is hinged on the bracket, and the two positioning members are slidably arranged on the bracket. The gear is located between the two positioning members and is coupled to the two positioning members.

In one embodiment of the present invention, each of the above-mentioned positioning members includes a clamping portion clamped with the corresponding positioning portion and a gear portion corresponding to the clamping portion. The gear is located between the two gear portions of the two positioning members and is engaged with the two gear portions.

In one embodiment of the present invention, the sliding directions of the two positioning members are opposite to each other.

In one embodiment of the present invention, the two positioning parts of the above-mentioned base are arranged corresponding to the second end of the bracket, the gear is hinged at the second end of the bracket, and the two positioning members are slidably arranged at the second end of the bracket.

In one embodiment of the present invention, the positioning portion has a slot, and the positioning member has a hook. The hook is suitable for being inserted into or removed from the slot.

In one embodiment of the present invention, the portable electronic device further includes a rotating shaft and a fixing frame. The rotating shaft is fixed to the base. The fixing frame is fixed to the first end of the bracket, wherein the fixing frame has a sleeve portion, and the sleeve portion is sleeved on the rotating shaft.

In one embodiment of the present invention, when the bracket is rotated and lifted relative to the base, the shaft and the sleeve part rotate relative to each other and generate a first torque. When the bracket is rotated and lowered relative to the base, the shaft and the sleeve part rotate relative to each other and generate a second torque greater than the first torque.

Based on the above, in the portable electronic device of the present invention, the user can rotate the display body to release the locking relationship between the bracket and the base. After releasing the locking relationship between the bracket and the base, the bracket can be rotated and raised relative to the base, so that the user can adjust the viewing angle and viewing height of the display body as needed. Therefore, the portable electronic device of the present invention has excellent operational mobility and convenience.

In order to make the above features and advantages of the present invention more clearly understood, the following is a detailed description of the embodiments with the accompanying drawings.

100: Portable electronic devices

110: Display the machine

120: Base

121: Positioning unit

121a: Card slot

130: Bracket

131: First end

132: Second end

140: Switch mechanism

141: Positioning piece

141a: snap-fitting part

141b: Tooth section

142: Follower

142a: Driven side

143: Compression spring

144: Gear

150: Torsion spring

160, 170: Rotating axis

161: Rod

162: Drive Department

162a: Driving surface

163: Limiting part

180, 190: Fixed frame

181, 191: Sleeve part

A1: First angle

A2: Second angle

Figures 1A to 1D are schematic diagrams of a portable electronic device in a first state to a fourth state according to an embodiment of the present invention.

Figures 2A to 2D are partial top views of the display body omitted from Figures 1A to 1D.

FIG. 1A to FIG. 1D are schematic diagrams of a portable electronic device in a first state to a fourth state according to an embodiment of the present invention. Please refer to FIG. 1A to FIG. 1D. In this embodiment, the portable electronic device 100 may be a tablet computer integrated with a lifting support structure, so that the user can flexibly adjust the viewing angle and viewing height, thus having excellent operational mobility and convenience.

FIG. 2A to FIG. 2D are partial top views of FIG. 1A to FIG. 1D with the display body omitted. As shown in FIG. 1A and FIG. 1B, in this embodiment, the portable electronic device 100 includes a display body 110, a base 120, a bracket 130, and a switch mechanism 140, and the display body 110 is connected to the base 120 through the bracket 130. As shown in FIG. 1A and FIG. 2A, in the first state, the bracket 130 is locked to the base 120. As shown in FIG. 1B and FIG. 2B, the user can rotate the display body 110 to release the locking relationship between the bracket 130 and the base 120 to switch to the second state.

As shown in FIG. 1C and FIG. 2C, in the third state, the locking relationship between the bracket 130 and the base 120 is released, and the display body 110 and the bracket 130 can be rotated and lifted relative to the base 120. As shown in FIG. 1D and FIG. 2D, in the fourth state, the display body 110 is rotated to the maximum unfolding angle relative to the bracket 130, and the bracket 130 is rotated to the maximum unfolding angle relative to the base 120, so that the display body 110 is lifted to the maximum lifting height. Specifically, the rotation of the display body 110 relative to the bracket 130 can adjust the viewing angle of the display body 110, and the rotation of the bracket 130 relative to the base 120 can adjust the viewing angle and viewing height of the display body 110.

Please refer to FIG. 1A and FIG. 1B. In this embodiment, the bracket 130 is disposed between the display body 110 and the base 120, and has a first end 131 and a second end 132 opposite to each other. In detail, the first end 131 of the bracket 130 is pivoted to the base 120, and the second end 132 of the bracket 130 is pivoted to the display body 110. The base 120 is provided with two positioning parts 121 corresponding to the second end 132 of the bracket 130, and is disposed on opposite sides of the bracket 130. The switch mechanism 140 is disposed at the second end 132 of the bracket 130 and coupled to the display body 110. In addition, the two positioning parts 121 are respectively located on opposite sides of the switch mechanism 140.

As shown in FIG. 2A , the switch mechanism 140 includes two positioning members 141. In the first state, each positioning member 141 is engaged with the corresponding positioning portion 121 to lock the bracket 130 to the base 120. In detail, each positioning member 141 includes a locking portion 141a, such as a hook that matches the slot 121a of the corresponding positioning portion 121. The locking portion 141a of each positioning member 141 is locked into the slot 121a, and the slot 121a generates structural interference with the locking portion 141a to prevent the bracket 130 from rotating and lifting relative to the base 120.

As shown in FIG. 1A, FIG. 1B, FIG. 2A and FIG. 2B, when the display body 110 rotates to the first angle A1 (e.g., between 40 and 45 degrees) relative to the second end 132 of the bracket 130, the switch mechanism 140 is driven by the display body 110, so that the two positioning members 141 slide in two opposite directions at the second end 132 of the bracket 130 and separate from the two positioning portions 121. In other words, the engaging portion 141a of each positioning member 141 moves out of the corresponding slot 121a of the positioning portion 121, that is, the engaging portion 141a is not interfered by the structure of the slot 121a. After the locking relationship between the bracket 130 and the base 120 is released, the display body 110 and the bracket 130 can be rotated and lifted relative to the base 120, as shown in FIG. 1C and FIG. 1D.

As shown in FIG. 1B , FIG. 2A and FIG. 2B , the portable electronic device 100 further includes two torsion springs 150 disposed corresponding to the first end 131 of the bracket 130. In a first state, the two torsion springs 150 are squeezed by the bracket 130. As shown in FIG. 1C , FIG. 2B and FIG. 2C , after the locking relationship between the bracket 130 and the base 120 is released (i.e., after the two positioning members 141 are separated from the two positioning portions 121), the two torsion springs 150 are released and drive the bracket 130 to rotate and rise to a second angle A2 (e.g., between 5 and 10 degrees) relative to the base 120. That is, after the locking relationship between the bracket 130 and the base 120 is released, the elastic force of the torsion spring 150 can drive the bracket 130 to automatically rotate and lift to a preset angle or preset height relative to the base 120, so that the user can lift the display body 110 and the bracket 130 with less effort.

Please refer to FIG. 1B, FIG. 2A and FIG. 2B. In this embodiment, the portable electronic device 100 further includes two rotating shafts 160 fixedly connected to the display body 110. Specifically, the two rotating shafts 160 are pivotally connected to the second end 132 of the bracket 130, and the display body 110 is coupled to the switch mechanism 140 through the two rotating shafts 160. Each rotating shaft 160 includes a rod 161, a driving portion 162 connected to the rod 161, and a limiting portion 163 connected to the rod 161, and the driving portion 162 and the limiting portion 163 are arranged opposite to each other. In addition, the switch mechanism 140 further includes two followers 142 respectively mounted on the rods 161 of the two rotating shafts 160 and two compression springs 143 respectively mounted on the two rods 161 of the two rotating shafts 160, and each follower 142 is connected to a corresponding positioning member 141.

Each follower 142 is adapted to slide between the driving portion 162 and the stop portion 163 of the corresponding rotating shaft 160. In addition, the two opposite ends of each compression spring 143 contact the corresponding follower 142 and the stop portion 163 of the corresponding rotating shaft 160, respectively, so that the follower 142 and the driving portion 162 maintain contact. When the display body 110 rotates to the first angle A1 (e.g., between 40 degrees and 45 degrees) relative to the second end 132 of the bracket 130, the two rotating shafts 160 rotate synchronously with the display body 110, and drive the two followers 142 to slide in two opposite directions through the two driving portions 162. At the same time, the two positioning members 141 slide synchronously with the two follower members 142 to separate from the two positioning portions 121, thereby releasing the locking relationship between the bracket 130 and the base 120.

As shown in FIGS. 1A to 1D , the display body 110 is rotated and lifted relative to the bracket 130. During this period, as shown in FIGS. 2A to 2D , the driving portion 162 of each shaft 160 pushes the corresponding follower 142 to slide toward the limit portion 163 and squeezes the corresponding compression spring 143. Conversely, when the display body 110 is rotated and lowered relative to the bracket 130, the elastic force of each compression spring 143 can push the corresponding follower 142 to slide toward the driving portion 162, so that the follower 142 slides back to the initial position.

In this embodiment, the driving portion 162 of each rotating shaft 160 has a driving surface 162a facing the corresponding follower 142, wherein each follower 142 has a follower surface 142a that is in sliding contact with the driving surface 162a of the corresponding driving portion 162, and the driving surface 162a and the follower surface 142a are two matching concave and convex surfaces. As shown in FIGS. 1A to 1D, the display body 110 rotates and rises relative to the bracket 130. During this period, as shown in FIGS. 2A to 2D, the driving portion 162 of each rotating shaft 160 rotates synchronously with the display body 110 and rotates relative to the corresponding follower 142. At the same time, the convex surface of the driving surface 162a of each driving portion 162 moves away from the concave surface of the corresponding driven surface 142a of the follower 142 and moves toward the convex surface of the driven surface 142a. As the degree of contact between the convex surface of the driving surface 162a and the convex surface of the driven surface 142a increases, the driving portion 162 pushes the follower 142 toward the limiting portion 163.

On the contrary, when the display body 110 rotates and descends relative to the bracket 130, the driving part 162 of each rotating shaft 160 rotates synchronously with the display body 110 and rotates relative to the corresponding follower 142. At the same time, the convex surface in the driving surface 162a of each driving part 162 moves away from the convex surface in the follower surface 142a of the corresponding follower 142 and moves toward the concave surface in the follower surface 142a. As the degree of contact between the convex surface in the driving surface 162a and the convex surface in the follower surface 142a decreases, the elastic force of the compression spring 143 pushes the follower 142 toward the driving part 162, so that the convex surface in the driving surface 162a moves into the concave surface in the follower surface 142a.

Please refer to FIG. 1B, FIG. 2A and FIG. 2B, the portable electronic device 100 further includes two rotating shafts 170 fixed to the base 120, wherein the first end 131 of the bracket 130 is pivoted to the two rotating shafts 170, and two torsion springs 150 are respectively sleeved on the two rotating shafts 170. In addition, one end of each torsion spring 150 is connected to the first end 131 of the bracket 130, and the other end is connected to the corresponding rotating shaft 170.

Please refer to Figures 1A to 1D or Figures 2A to 2D, the portable electronic device 100 further includes two fixing frames 180 and two fixing frames 190. Specifically, the two fixing frames 180 are fixed to the first end 131 of the bracket 130, wherein the two fixing frames 180 both have a sleeve portion 181, and the two sleeve portions 181 are respectively sleeved on the two rotating shafts 170. In addition, the two fixing frames 190 are fixed to the second end 132 of the bracket 130, wherein the two fixing frames 190 both have a sleeve portion 191, and the two sleeve portions 191 are respectively sleeved on the two rotating shafts 160.

When the display body 110 is rotated and lifted relative to the bracket 130, each shaft 160 rotates relative to the corresponding sleeve portion 191 and generates a first torque (or a first friction resistance). Conversely, when the display body 110 is rotated and lowered relative to the bracket 130, each shaft 160 rotates relative to the corresponding sleeve portion 191 and generates a second torque (or a second friction resistance) greater than the first torque. In other words, the display body 110 and the bracket 130 that are pivotally connected to each other adopt a torque design of light lifting and slow lowering, so that the user can lift the display body 110 with less effort and prevent the display body 110 from accidentally falling after lifting. In addition, the display body 110 can be lowered slowly to avoid collisions or component damage caused by too fast a lowering speed.

When the bracket 130 is rotated and lifted relative to the base 120, each shaft 170 and the corresponding sleeve portion 181 rotate relative to each other and generate a first torque (or a first friction resistance). Conversely, when the bracket 130 is rotated and lowered relative to the base 120, each shaft 170 and the corresponding sleeve portion 181 rotate relative to each other and generate a second torque (or a second friction resistance) greater than the first torque. In other words, the bracket 130 and the base 120 that are pivotally connected to each other adopt a torque design of light lifting and slow lowering, so that the user can lift the bracket 130 with less effort and prevent the bracket 130 from accidentally falling after lifting. In addition, the bracket 130 can be lowered slowly to avoid collisions or component damage caused by too fast a lowering speed.

On the other hand, after releasing the locking relationship between the bracket 130 and the base 120, the two torsion springs 150 can not only drive the bracket 130 to automatically rotate and lift to a preset angle or preset height, but also reduce the force required by the user to continuously lift the bracket 130, and can also provide support for the bracket 130 to prevent the bracket 130 from accidentally falling after lifting. In addition, during the process of the bracket 130 rotating and descending, the two torsion springs 150 are squeezed to generate resistance or reaction force on the bracket 130 to ensure that the bracket 130 descends slowly to avoid collision or component damage due to excessive descent speed.

As shown in FIG. 2A and FIG. 2B , the switch mechanism 140 further includes a gear 144 pivoted at the second end 132 of the bracket 130. Specifically, the gear 144 is located between the two positioning members 141 and coupled to the two positioning members 141. More specifically, each positioning member 141 further includes a gear portion 141b relative to the engaging portion 141a, and the two gear portions 141b of the two positioning members 141 are parallel to each other. The gear 144 is located between the two gear portions 141b and is engaged with the two gear portions 141b to ensure that the two positioning members 141 slide synchronously but in opposite directions.

The above embodiment is explained by the switch mechanism 140 including two positioning members 141, two follower members 142, two compression springs 143 and gears 144 that match the two positioning members 121, but the present invention is not limited thereto. Other embodiments may only provide a single positioning member on a single side of the bracket, and accordingly, the switch mechanism may only include a single positioning member, a single follower and a single compression spring that match the positioning member, and no gears are provided. In addition, only a single shaft includes a driving member that matches the follower and a limiting member that matches the compression spring.

The positioning portion 121 of the above embodiment is disposed corresponding to the second end 132 of the bracket 130, and the switch mechanism 140 is disposed at the second end 132 of the bracket 130, but the present invention is not limited thereto. The positioning portion of other embodiments may be disposed corresponding to the first end of the bracket or to other parts of the bracket between the first end and the second end, and correspondingly, the switch mechanism may be disposed at the first end or between the first end and the second end of the bracket.

In summary, in the portable electronic device of the present invention, the user can rotate the display body to release the locking relationship between the bracket and the base. After releasing the locking relationship between the bracket and the base, the bracket can automatically rotate and rise relative to the base to a preset angle or a preset height, so that the user can lift the display body and the bracket with less effort and adjust the viewing angle and viewing height of the display body. Therefore, the portable electronic device of the present invention has excellent operational maneuverability and convenience. On the other hand, the display body and the bracket pivotally connected to each other and the bracket and the base pivotally connected to each other all adopt a torque design of light lifting and slow falling, so that the user can lift the display body and the bracket with less effort and prevent the display body and the bracket from accidentally falling down after lifting. In addition, the display body and bracket can be lowered slowly to avoid collision or component damage caused by descending too fast.

Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the attached patent application.

100: Portable electronic devices

110: Display the machine

120: Base

121: Positioning unit

130: Bracket

131: First end

132: Second end

140: Switch mechanism

141: Positioning piece

150: Torsion spring

160, 170: Rotating axis

180, 190: Fixed frame

181, 191: Sleeve part

Claims (19)

A portable electronic device includes: a display body; a base; a bracket, disposed between the display body and the base, and having a first end and a second end opposite to each other, wherein the first end of the bracket is pivoted to the base, and the second end of the bracket is pivoted to the display body, and the base is provided with a positioning portion corresponding to the bracket; and a switch mechanism, disposed on the bracket and coupled to the display body, wherein the switch mechanism includes a positioning member, and the positioning member is engaged with the positioning portion, and when the display body rotates to a first angle relative to the second end of the bracket, the switch mechanism is driven by the display body, so that the positioning member is separated from the positioning portion. The portable electronic device as described in claim 1 further comprises: A torsion spring, wherein one end of the torsion spring is connected to the first end of the bracket, and after the positioning member is separated from the positioning portion, the torsion spring drives the bracket to rotate and rise to a second angle relative to the base. The portable electronic device as described in claim 2 further comprises: A rotating shaft fixed to the base, wherein the first end of the bracket is pivoted to the rotating shaft, and the other end of the torsion spring is connected to the rotating shaft. A portable electronic device as described in claim 1, wherein the positioning portion of the base is arranged corresponding to the second end of the bracket, and the switch mechanism is arranged at the second end of the bracket. The portable electronic device as described in claim 4 further comprises: A rotating shaft fixedly connected to the display body and pivotally connected to the second end of the bracket, wherein the display body is coupled to the switch mechanism via the rotating shaft. A portable electronic device as described in claim 5, wherein the rotating shaft includes a rod and a driving part connected to the rod, and the switch mechanism further includes a follower slidably sleeved on the rod, the follower contacts the driving part and is connected to the positioning member. A portable electronic device as described in claim 6, wherein the driving portion has a driving surface facing the follower, and the follower has a follower surface in sliding contact with the driving surface. A portable electronic device as described in claim 7, wherein the driving surface and the driven surface are two concave and convex surfaces that cooperate with each other. A portable electronic device as described in claim 6, wherein the rotating shaft further includes a limiting portion connected to the rod portion, and the limiting portion is arranged opposite to the driving portion, and the follower is slidably arranged between the driving portion and the limiting portion. A portable electronic device as described in claim 9, wherein the switch mechanism further includes a compression spring sleeved on the rod portion, and opposite ends of the compression spring respectively contact the follower and the limiting portion. The portable electronic device as described in claim 5 further comprises: A fixing frame fixedly connected to the second end of the bracket, wherein the fixing frame has a sleeve portion, and the sleeve portion is sleeved on the rotating shaft. A portable electronic device as described in claim 11, wherein when the display body is rotated and lifted relative to the bracket, the shaft and the sleeve portion rotate relative to each other and generate a first torque, and when the display body is rotated and lowered relative to the bracket, the shaft and the sleeve portion rotate relative to each other and generate a second torque greater than the first torque. A portable electronic device as described in claim 1, wherein the base is provided with two relative positioning parts corresponding to the bracket, and the switch mechanism includes a gear and two relatively arranged positioning members, the two positioning members are respectively engaged with the two positioning parts, the gear is hinged on the bracket, and the two positioning members are slidably arranged on the bracket, the gear is located between the two positioning members, and is coupled to the two positioning members. A portable electronic device as described in claim 13, wherein each of the positioning members includes a locking portion that is locked in the corresponding positioning portion and a gear portion opposite to the locking portion, and the gear is located between the two gear portions of the two positioning members and is engaged with the two gear portions. A portable electronic device as described in claim 13, wherein the sliding directions of the two positioning members are opposite to each other. A portable electronic device as described in claim 13, wherein the two positioning portions of the base are arranged corresponding to the second end of the bracket, the gear is hinged at the second end of the bracket, and the two positioning members are slidably arranged at the second end of the bracket. A portable electronic device as described in claim 1, wherein the positioning portion has a card slot, and the positioning member has a card hook, and the card hook is suitable for being inserted into or removed from the card slot. The portable electronic device as described in claim 1 further comprises: a rotating shaft fixedly connected to the base; and a fixing frame fixedly connected to the first end of the bracket, wherein the fixing frame has a sleeve portion, and the sleeve portion is sleeved on the rotating shaft. In the portable electronic device as described in claim 18, when the bracket is rotated and lifted relative to the base, the shaft and the sleeve portion rotate relative to each other and generate a first torque, and when the bracket is rotated and lowered relative to the base, the shaft and the sleeve portion rotate relative to each other and generate a second torque greater than the first torque.

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