Roller mechanism and input device using the same

Abstract

The present invention provides a roller mechanism including a mandrel, a roller member, and a resilient member. The mandrel has a plurality of protruding portions. The roller member is disposed around the mandrel and rotatably relative to the mandrel. The resilient member has a first end and a second end, the first end abutting the protruding portions, and the second end facing an inner surface of the roller member.

Description

Technical Field

[0001] This disclosure relates to a roller mechanism and an input device using the same. Background Technology

[0002] Existing input devices include a scroll mechanism, which protrudes from the housing for user finger operation. However, providing a tactile experience of scrolling is a crucial design goal for input devices. Summary of the Invention

[0003] The purpose of this invention is to provide a roller mechanism and an input device using the same, which can provide a rolling feel.

[0004] To achieve the above objectives, the present invention provides a roller mechanism, comprising: a spindle having a plurality of protrusions; a roller member rotatably disposed around and relative to the spindle; and an elastic member having a first end and a second end, the first end abutting against the plurality of protrusions, and the second end facing a surface located inside the roller member.

[0005] Preferably, the elastic element includes: a ball having the first end; and a spring having the second end and a third end, the third end being connected to the ball.

[0006] Preferably, the elastic element includes: a ball having the first end; a spring having the second end and a third end, the third end being connected to the ball; and a housing accommodating the ball and the spring, and having an external thread; wherein the roller has an internal thread that engages with the external thread.

[0007] Preferably, the roller member includes: a support portion; and a roller portion surrounding the support portion; wherein the surface is the inner peripheral surface of the inner side of the roller portion.

[0008] Preferably, the roller component includes: a support portion; and a roller portion surrounding the support portion; wherein the support portion has a receiving space in which the elastic member is received.

[0009] Preferably, the protrusion direction of each protrusion is perpendicular to the center line of the mandrel, the bearing portion has an outer peripheral surface and an inner peripheral surface, and the accommodating space extends from the outer peripheral surface to the inner peripheral surface.

[0010] Preferably, the protrusion direction of each protrusion is parallel to the center line of the mandrel, the bearing portion has opposing first and second sides, the first side faces the plurality of protrusions, and the accommodating space extends from the first side to the second side.

[0011] Preferably, the accommodating space extends from the first side to the second side, and the elastic member includes: a ball having the first end; a spring having the second end and a third end, the third end being connected to the ball; and a housing accommodating the ball and the spring, and being housed within the accommodating space.

[0012] Preferably, the plurality of protrusions are arranged in a closed ring around the centerline of the mandrel.

[0013] To achieve the above objectives, the present invention also provides an input device, comprising: a housing having an opening; and a roller mechanism as described above, disposed in the housing; wherein the roller component is partially exposed outside the opening and the spindle is non-rotatably disposed relative to the housing.

[0014] To achieve the above objectives, the present invention further provides an input device, comprising: a housing having an opening; a spindle having a plurality of protrusions, the spindle being non-rotatably disposed inside the housing relative to the housing; a roller member disposed inside the housing, the roller member being partially exposed outside the opening, the roller member also having a through hole to receive the spindle, the roller member being rotatably disposed relative to the spindle; and an elastic member having a first end and a second end, the first end abutting against the plurality of protrusions, and the second end facing the surface located inside the roller member.

[0015] Compared with the prior art, the roller mechanism of the present invention can be applied to input devices. The roller mechanism includes at least a spindle, a roller component, and an elastic element. The spindle is non-rotatably disposed in the housing, and the roller component is rotatably disposed relative to the spindle. The spindle has multiple protrusions, and a first end of the elastic element abuts against these protrusions. Thus, when the roller component rotates relative to the spindle, the first end of the elastic element passes over the undulating multiple protrusions, thereby producing a segmented rolling feel. Attached Figure Description

[0016] Figure 1A A diagram illustrating an input device assembly according to an embodiment of the present disclosure is provided.

[0017] Figure 1B Draw Figure 1A Exploded view of the input device (top shell not shown).

[0018] Figure 2A and Figure 2B Draw Figure 1A The figure shows an exploded view of the roller mechanism from different perspectives.

[0019] Figure 2C Draw Figure 1B A cross-sectional view of the roller mechanism along the direction 2C-2C'.

[0020] Figure 3 A cross-sectional view of a roller mechanism according to another embodiment of the present invention is shown.

[0021] Figure 4A and Figure 4B Exploded views of a roller mechanism according to another embodiment of the present invention are shown from different perspectives.

[0022] Figure 4C Draw Figure 4A A cross-sectional view of the assembled roller mechanism.

[0023] Figure 5 A cross-sectional view of a roller mechanism according to another embodiment of the present invention is shown. Detailed Implementation

[0024] To provide a further understanding of the purpose, structure, features, and functions of the present invention, detailed descriptions are provided below with reference to specific embodiments.

[0025] Please refer to Figures 1A to 2C , Figure 1A A diagram illustrating an assembly of an input device 10 according to an embodiment of the present disclosure is provided. Figure 1B Draw Figure 1A An exploded view of the input device 10 (upper housing 11B not shown). Figure 2A and Figure 2B Draw Figure 1A The roller mechanism 100 is shown in exploded views from different angles, and Figure 2C Draw Figure 1B The scroll wheel mechanism 100 is shown in cross-sectional view along direction 2C-2C'. The input device 10 of this embodiment is described using a mouse as an example, but other types of input devices, such as a keyboard, are also possible. Furthermore, the scroll wheel mechanism 100 can be configured on products requiring input, such as mice, keyboards, and home appliances.

[0026] like Figure 1A and Figure 1B As shown, the input device 10 includes a housing 11, a switch 12, and a roller mechanism 100. The housing 11 has an opening 11a. The roller mechanism 100 is disposed on the housing 11. The roller mechanism 100 is partially exposed outside the opening 11a for user operation. The housing 11 includes a bottom shell 11A and an upper shell 11B (drawn in dashed lines). The switch 12 and the roller mechanism 100 are disposed on the bottom shell 11A, and the upper shell 11B has the aforementioned opening 11a and is connected to the bottom shell 11A.

[0027] like Figure 1A and Figure 2A As shown, the roller mechanism 100 includes a spindle 110, a roller component 120, an elastic element 130, and a bushing 140. Figure 1AAs shown, the roller component 120 of the roller mechanism 100 is partially exposed outside the opening 11a for the user to roll the roller component 120. The spindle 110 is non-rotatably configured relative to the housing 11. For example, the spindle 110 includes a third end 110A and a fourth end 110B. A bushing 140 is fitted onto the third end 110A of the spindle 110, for example, the bushing 140 is non-rotatably connected to the third end 110A of the spindle 110. In this embodiment, the third end 110A of the spindle 110 is a polygonal end (polygonal in cross-section), and the bushing 140 has a matching recess. Thus, when the third end 110A of the spindle 110 is engaged with the recess of the bushing 140, the spindle 110 and the bushing 140 will not rotate relative to each other. The aforementioned polygonal end is, for example, a rectangular end, a square end, a triangular end, or other polygonal ends. In another embodiment, the third end 110A of the mandrel 110 can be an elliptical end or a geometry other than a circle.

[0028] like Figure 1A and Figure 2A As shown, the bushing 140 is pressed by the upper shell 11B to restrict the rotational freedom of the bushing 140, thereby restricting the rotational freedom of the spindle 110. The switch 12 is disposed on the bottom shell 11A and its position corresponds to the fourth end 110B of the spindle 110. When the roller 120 is pressed, the fourth end 110B of the spindle 110 moves downward relative to the third end 110A (which acts as a fulcrum), triggering the switch 12. The triggered switch 12 transmits a trigger signal (not shown) to a controller (not shown) within the input device 10, which then executes a corresponding action, such as executing a corresponding program (software or firmware) or transmitting a signal to a circuit board (not shown) of an electronic device (not shown), wherein the electronic device is electrically connected to the input device 10. The electronic device may be, for example, a computer, mobile phone, server, or home appliance—an electronic product requiring an input device.

[0029] like Figures 2A-2C As shown, the spindle 110 has a plurality of protrusions 111. The roller member 120 is rotatably configured around and relative to the spindle 110. The elastic member 130 has a first end 130A and a second end 130B, the first end 130A abutting against the protrusions 111, and the second end 130B facing the inner surface 120s of the roller member 120. Thus, when the roller member 120 rotates relative to the spindle 110, the first end 130A slides on the protrusions 111, providing the user with a segmented (stepped) rolling feel. Furthermore, the number of protrusions 111 may be, for example, between 12 and 20, but this is not intended to limit the embodiments of the invention.

[0030] like Figures 2A to 2BAs shown, in this embodiment, the protrusion direction D1 of each protrusion 111 is perpendicular to the center line C1 of the spindle 110, that is, the protrusion direction D1 of each protrusion 111 is substantially perpendicular to the axial direction of the spindle 110 (or substantially parallel to the radial direction of the spindle 110). Furthermore, these protrusions 111 are arranged in a closed annular (360-degree, circumferential) manner around the center line C1 of the spindle 110; or, multiple protruding surfaces of these protrusions 111 constitute the entire circumferential surface of the spindle 110. Thus, when the roller 120 rotates 360 degrees relative to the spindle 110, the first end 130A can press against one or more of these protrusions 111 during rotation. Furthermore, at least two of these protrusions 111 are continuously connected and / or the peaks of at least two of these protrusions 111 are equidistant or dissimilar from the center line C1 of the spindle 110.

[0031] like Figures 2A to 2B As shown, the roller component 120 includes a support portion 121 and a roller portion 122. The roller portion 122 is made of a material such as plastic or rubber. A portion of the roller portion 122 is exposed through the opening 11a (opening 11a is shown in...). Figure 1A The roller portion 122 is provided for the user to roll. The roller portion 122 surrounds the support portion 121. The support portion 121 and the roller portion 122 are fixed to each other, for example, by various fixing methods such as snap-fit, screw-fit, or adhesive. In this way, when the roller portion 122 rolls, the support portion 121 can move synchronously to drive the elastic element 130 to rotate synchronously around the spindle 110.

[0032] like Figures 2A to 2B As shown, the roller component 120 has a through hole 120b1 to receive the spindle 110. For example, the third end 110A of the spindle 110 can pass through the through hole 120b1, such that the third end 110A and the fourth end 110B are located on opposite sides of the roller component 120. In addition, the roller component 120 also has a recess 120b2 to receive these protrusions 111.

[0033] like Figure 2C As shown, in this embodiment, surface 120s is the inner peripheral surface of the roller portion 122. The elastic member 130 is movable to the support portion 121. For example, the support portion 121 has a receiving space 120a, and the elastic member 130 is housed in the receiving space 120a to rotate with the support portion 121. Furthermore, since the roller portion 122 surrounds the support portion 121, surface 120s overlaps with the opening 120a1 of the receiving space 120a (surface 120s covers the opening of the receiving space 120a), thus, the second end 130B of the elastic member 130 (the second end 130B is indicated by...) Figure 2AIt can be pressed against the surface 120s. Furthermore, the supporting portion 121 has an outer peripheral surface 121s1 and an inner peripheral surface 121s2, and the aforementioned accommodating space 120a extends from the outer peripheral surface 121s1 to the inner peripheral surface 121s2, that is, it penetrates the supporting portion 121. Thus, the first end 130A (the first end 130A is indicated on...) of the elastic member 130 located within the accommodating space 120a... Figure 2A The second end 130B can be pressed against the protrusion 111 of the spindle 110 through the through-through accommodating space 120a, and the second end 130B can be pressed against the surface 120s through the through-through accommodating space 120a.

[0034] like Figures 2A to 2C As shown, the elastic element 130 includes a ball 131 and a spring 132. The ball 131 has a first end 130A, or the ball 131 itself is the first end 130A. The spring 132 has a second end 130B and a third end 132A, the third end 132A being connected to the ball 131. Depending on the diameter of the ball 131, the ball 131 may contact one or more of the protrusions 111. When the elastic element 130 is accommodated in the accommodating space 120a and confined between the roller portion 122 and the spindle 110, the elastic element 130 deforms to normally (frequently) provide an elastic restoring force to the protrusions 111 of the spindle 110, causing the second end 130B of the elastic element 130 to normally (frequently) press against the protrusions 111.

[0035] Please refer to Figure 3 The diagram illustrates a cross-sectional view of a roller mechanism 200 according to another embodiment of the present invention. The roller mechanism 100 of the input device can be replaced by the roller mechanism 200. The roller mechanism 200 includes a spindle 110, a roller component 220, an elastic element 230, and a bushing 140. The roller mechanism 200 has the same or similar technical features as the aforementioned roller mechanism 100, except that the structure of the elastic element 230 in the roller mechanism 200 is different.

[0036] like Figure 3As shown, the elastic element 230 includes a ball 131, a spring 132, and a housing 231. The ball 131 has a first end 130A, and the spring 132 has a second end 130B and a third end 132A, with the third end 132A connected to the ball 131. The housing 231 houses the ball 131 and the spring 132. The housing 231 has a receiving portion 231a, where the ball 131 and the spring 132 are located, with the ball 131 partially protruding from the receiving portion 231a to press against the protrusion 111 of the spindle 110. Furthermore, the housing 231 has an external thread 231A, and the roller element 220 has an internal thread 220A. For example, the receiving space 120a of the bearing portion 121 has an internal thread 220A, which can be screwed into the external thread 231A. The elastic element 230 can be quickly installed on or quickly removed from the roller component 220 via screw thread. The second end 130B of the spring 132 faces the inner surface 220s of the roller component 220. The surface 220s is, for example, the bottom surface of the receiving portion 231a, and the second end 130B of the spring 132 abuts against the surface 220s. When the elastic element 230 is disposed in the receiving space 120a and the ball 131 presses against the protrusion 111 of the spindle 110, the spring 132 and the ball 131 are confined between the surface 220s of the receiving portion 231a of the housing 231 and the spindle 110. At this time, the spring 132 deforms to provide an elastic restoring force to the protrusion 111 of the spindle 110 in a normal (frequent) manner, so that the first end 130A of the elastic element 230 is normally (frequently) pressed against the protrusion 111.

[0037] like Figure 3 As shown, the position of the elastic element 230 can be adjusted by screwing, thereby adjusting the resistance force (elastic restoring force) applied by the elastic element 230 to the protrusion 111. Specifically, the distance H1 between the top surface 231u of the housing 231 of the elastic element 230 and the protrusion 111 can be adjusted by screwing. A larger distance H1 results in a smaller resistance force applied by the elastic element 230 to the protrusion 111, and vice versa. Different resistance forces provide different segmented rolling feel.

[0038] like Figure 3 As shown, the housing 231 has a groove 2311, the shape of which can be matched with a tool so that it can be operated by the tool to adjust the position of the elastic member 230. For example, the groove 2311 is a Phillips head groove and the tool is a matching Phillips screwdriver; or, the groove 2311 is a flathead groove and the tool is a matching flathead screwdriver.

[0039] Although the elastic element 230 in this embodiment is described as being screwed onto the roller element 220, in another embodiment, the elastic element 230 and the roller element 220 may also be connected by a fixing method other than screwing, such as snap-fitting or gluing. In this case, the external thread 231A of the elastic element 230 may be omitted and the internal thread 220A of the roller element 220 may be omitted.

[0040] Please refer to Figures 4A to 4C , Figure 4A and Figure 4B Exploded views of a roller mechanism 300 according to another embodiment of the present invention are shown from different perspectives. Figure 4C Draw Figure 4A A cross-sectional view of the assembled roller mechanism 300. The roller mechanism 100 of the input device can be replaced by the roller mechanism 300.

[0041] like Figures 4A to 4C As shown, the roller mechanism 300 includes a spindle 310, a roller member 320, an elastic member 230, and a bushing 140. The spindle 310 has a plurality of protrusions 111. The roller member 120 is rotatably disposed around and relative to the spindle 310. The elastic member 130 has a first end 130A and a second end 130B, the first end 130A abutting against the protrusions 111, and the second end 130B facing the inner surface 320s of the roller member 320. Thus, when the roller member 320 rotates relative to the spindle 310, the first end 130A slides on the protrusions 111, providing the user with a segmented rolling feel.

[0042] The roller mechanism 300 has the same or similar technical features as the aforementioned roller mechanism 100, except that the structures of the spindle 310 and the roller component 320 of the roller mechanism 300 are different.

[0043] like Figures 4A to 4B As shown, the protruding direction D1 of each protrusion 111 of the spindle 310 is parallel to the center line C1 of the spindle 310, that is, the protruding direction D1 of each protrusion 111 is approximately parallel to the axial direction of the spindle 110. Furthermore, these protrusions 111 are arranged in a closed annular shape (360 degrees, circumferentially) around the center line C1 of the spindle 310. Thus, when the roller 320 rotates 360 degrees relative to the spindle 310, the first end 130A can press against one of these protrusions 111.

[0044] like Figures 4A to 4CAs shown, the roller component 320 includes a support portion 321 and a roller portion 122. The support portion 321 and the roller portion 122 are fixed to each other (e.g., by various fixing methods such as snap-fit, screw-fit, or adhesive). Thus, when the roller portion 122 rolls, the support portion 321 can move synchronously to drive the elastic member 330 to rotate synchronously around the spindle 110. The support portion 321 has a first side surface 321s1 and a second side surface 321s2 facing each other. The first side surface 321s1 faces the protrusion 111, and the accommodating space 320a extends from the first side surface 321s1 to the second side surface 321s2, but does not penetrate the support portion 321.

[0045] like Figure 4C As shown, the aforementioned surface 320s is the internal surface of the bearing portion 321, for example, the bottom surface of the accommodating space 320a. The elastic member 130 includes a ball 131 and a spring 132. When the elastic member 130 is accommodated in the accommodating space 320a and confined between the surface 320s and the spindle 110, the elastic member 130 deforms to provide an elastic restoring force to the protrusion 111 of the spindle 310 in a normal (frequent) manner, so that the second end 130B of the elastic member 130 normally (frequently) presses against the protrusion 111.

[0046] Please refer to Figure 5 The diagram illustrates a cross-sectional view of a roller mechanism 400 according to another embodiment of the present invention. The roller mechanism 100 of the input device can be replaced by the roller mechanism 400. The roller mechanism 400 includes a spindle 310, a roller component 420, an elastic element 230, and a bushing 140. The roller mechanism 400 has the same or similar technical features as the aforementioned roller mechanism 300, except that the structure of the elastic element 230 in the roller mechanism 400 is different.

[0047] The roller component 420 includes a support portion 421 and a roller portion 122. The support portion 421 and the roller portion 122 are fixed to each other (e.g., by various fixing methods such as snap-fit, screw-fit, or adhesive). Thus, when the roller portion 122 rolls, the support portion 421 can move synchronously to drive the elastic member 230 to rotate synchronously around the spindle 310. The support portion 421 has a receiving space 420a and opposing first side surface 321s1 and second side surface 321s2, with the first side surface 321s1 facing the protrusion 111. In this embodiment, the receiving space 420a extends from the first side surface 321s1 to the second side surface 321s2, that is, it extends through the support portion 321.

[0048] like Figure 5As shown, the elastic element 230 includes a ball 131, a spring 132, and a housing 231. The ball 131 has a first end 130A, and the spring 132 has a second end 130B and a third end 132A, with the third end 132A connected to the ball 131. The housing 231 accommodates the ball 131 and the spring 132. The housing 231 has a receiving portion 231a, where the ball 131 and the spring 132 are located, with the ball 131 partially protruding from the receiving portion 231a to press against the protrusion 111 of the spindle 310. Furthermore, the housing 231 has an external thread 231A, and the roller element 420 has an internal thread 220A. For example, the receiving space 420a of the bearing portion 421 has an internal thread 220A, which can be screwed into the external thread 231A. Through screwing, the elastic element 230 can be quickly installed on the roller component 420 or quickly removed from the roller component 420.

[0049] like Figure 5 As shown, the second end 130B of the spring 132 faces the inner surface 220s of the roller member 420. Surface 220s is, for example, the bottom surface of the receiving portion 231a, and the second end 130B of the spring 132 abuts against surface 220s. When the elastic member 230 is disposed in the receiving space 420a and the ball 131 presses against the protrusion 111 of the spindle 310, the spring 132 and the ball 131 are restricted between the surface 220s of the receiving portion 231a of the housing 231 and the spindle 310. At this time, the spring 132 deforms to provide an elastic restoring force to the protrusion 111 of the spindle 310 in a normal (frequent) manner, so that the first end 130A of the elastic member 230 presses against the protrusion 111 in a normal (frequent) manner. As shown in FIG6, the position of the elastic member 230 can be adjusted by screwing to adjust the pressure (elastic restoring force) applied by the elastic member 230 to the protrusion 111. In detail, the distance H1 between the top surface 231u of the housing 231 of the elastic member 230 and the protrusion 111 can be adjusted by screwing. When the distance H1 is larger, the pressure exerted by the elastic member 230 on the protrusion 111 is smaller; conversely, the smaller the distance H1, the greater the pressure.

[0050] like Figure 5 As shown, the housing 231 has a groove 2311, the shape of which can be matched with a tool so as to be operated by the tool. For example, the groove 2311 is a Phillips head groove and the tool is a matching Phillips screwdriver; or, the groove 2311 is a flathead groove and the tool is a matching flathead screwdriver.

[0051] Although the elastic element 230 in this embodiment is described as being screwed onto the roller element 420, in another embodiment, the elastic element 230 and the roller element 420 may also be connected by a fixing method other than screwing, such as snap-fitting or gluing. In this case, the external thread 231A of the elastic element 230 may be omitted and the internal thread 220A of the roller element 420 may be omitted.

[0052] In summary, the roller mechanism disclosed in this embodiment can be applied to an input device. The roller mechanism includes at least a spindle, a roller component, and an elastic element. The spindle is non-rotatably disposed in the housing, and the roller component is rotatably disposed relative to the spindle. The spindle has multiple protrusions, and a first end of the elastic element abuts against these protrusions. Thus, when the roller component rotates relative to the spindle, the first end of the elastic element passes over the undulating multiple protrusions, generating a segmented rolling feel.

[0053] The present invention has been described in the above-described embodiments; however, these embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. Conversely, any modifications and refinements made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A roller mechanism, characterized in that, include: The spindle has multiple protrusions; A roller component, rotatably configured around and relative to the spindle, the roller component having an internal thread; as well as An elastic element has a first end and a second end. The first end abuts against the plurality of protrusions, and the second end faces the surface located inside the roller. The elastic element includes a ball, a spring, and a housing. The ball has the first end, and the spring has a second end and a third end. The third end is connected to the ball. The housing houses the ball and the spring. The housing has an external thread that engages with an internal thread. The position of the elastic element is adjusted by the engagement to adjust the pressure applied by the elastic element to the plurality of protrusions. Different pressures provide different segmented rolling feel.

2. The roller mechanism as described in claim 1, characterized in that, The roller component includes: Supporting part; and Roller section, surrounding the load-bearing section; The surface in question is the inner peripheral surface of the roller portion.

3. The roller mechanism as described in claim 1, characterized in that, The roller component includes: Supporting part; and Roller section, surrounding the load-bearing section; The supporting part has a receiving space, and the elastic member is received in the receiving space.

4. The roller mechanism as described in claim 3, characterized in that, The protrusion direction of each protrusion is perpendicular to the center line of the spindle. The bearing portion has an outer peripheral surface and an inner peripheral surface, and the accommodating space extends from the outer peripheral surface to the inner peripheral surface.

5. The roller mechanism as described in claim 3, characterized in that, The protrusion direction of each protrusion is parallel to the center line of the mandrel. The bearing portion has a first side and a second side opposite to each other. The first side faces the plurality of protrusions. The accommodating space extends from the first side to the second side.

6. The roller mechanism as described in claim 5, characterized in that, The accommodating space extends from the first side to the second side. The housing is housed within the accommodating space.

7. The roller mechanism as described in claim 1, characterized in that, The multiple protrusions form a closed loop around the center line of the mandrel.

8. An input device, characterized in that, include: The outer casing has openings; as well as The roller mechanism as described in any one of claims 1 to 7 is disposed in the housing; The roller component is partially exposed outside the opening, and the spindle is configured to be non-rotatable relative to the housing.

9. An input device, characterized in that, include: The outer casing has openings; A spindle having multiple protrusions is non-rotatably disposed inside the housing relative to the housing; A roller assembly, disposed inside the housing, partially exposed outside the opening, the roller assembly also having a through-hole to receive the spindle, the roller assembly being rotatably configured relative to the spindle, and the roller assembly having an internal thread; and An elastic element has a first end and a second end. The first end abuts against the plurality of protrusions, and the second end faces the surface located inside the roller. The elastic element includes a ball, a spring, and a housing. The ball has the first end, and the spring has a second end and a third end. The third end is connected to the ball. The housing houses the ball and the spring. The housing has an external thread that engages with an internal thread. The position of the elastic element is adjusted by the engagement to adjust the pressure applied by the elastic element to the plurality of protrusions. Different pressures provide different segmented rolling feel.

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