Liftable armrest device and engineering machine

Abstract

The utility model relates to a liftable arm pillow device, include: mounting support, arm pillow, operating knob, transmission mechanism, it includes pivot and cam, wherein the cam is rotatively fixed link with the first end of pivot, operating knob is rotatively fixed link with the second end of pivot, thereby the rotation movement of operating knob is converted into the linear motion of arm pillow along vertical direction, locking mechanism, operating knob can move between locking position and operating position along the axial direction of pivot, locking mechanism is configured: in locking position, the rotation of operating knob in the rotation direction is locked, and in operating position, operating knob is allowed to rotate locking mechanism along the rotation direction, and reset spring, it is configured when operating knob moves to operating position is compressed, and when the axial force is not applied to operating personnel, the reset force of operating knob is applied to operating knob towards locking position, makes operating knob and locking mechanism reset from operating position to locking position. The utility model relates to engineering machinery including above -mentioned liftable arm pillow device.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, and in particular to a height-adjustable armrest device for the cab of engineering machinery. Background Technology

[0002] In the cab of construction machinery, the work platform is usually equipped with an armrest to support the operator's arms, improving operational comfort and work efficiency. Existing armrest devices generally fall into two categories: fixed armrests and height-adjustable armrests. Fixed armrests cannot be height-adjusted, resulting in insufficient comfort during use. While height-adjustable armrests can be raised and lowered within a certain range, they still have several problems in practical applications: existing height-adjustable armrests mostly rely on manual pushing, knob adjustment, or screw mechanisms for raising and lowering, requiring the operator to apply considerable force, making operation inconvenient; during raising and lowering, existing devices struggle to achieve automatic or reliable locking. Armrests are prone to positional drift or accidental falling, posing safety hazards and affecting operational stability; some lifting mechanisms have complex designs, occupying internal cab space, resulting in high manufacturing costs and difficult maintenance. Utility Model Content

[0003] In order to overcome at least one of the above problems, the purpose of this utility model is to provide a height-adjustable armrest device that is compact in structure, easy to operate and has reliable locking, which can accurately position and automatically lock the armrest position during the lifting process to ensure the safety and comfort of the driver during the operation of the work platform.

[0004] Therefore, this utility model provides a height-adjustable armrest device, comprising: a mounting bracket; an armrest connected to the mounting bracket in a vertically movable manner; an operating knob; a transmission mechanism including a rotating shaft and a cam, wherein the cam is rotatably fixed to a first end of the rotating shaft, and the operating knob is rotatably fixed to a second end of the rotating shaft, so that the rotational movement of the operating knob is converted into linear movement of the armrest in the vertical direction; and a locking mechanism, wherein the operating knob is movable along the axial direction of the rotating shaft between a locked position and an operating position, and the locking mechanism is configured to lock the operating knob in the locked position. The operation includes rotation in the direction of rotation; and allowing the operating knob to rotate in the direction of rotation in the operating position, wherein unlocking of the locking mechanism is achieved by the operator applying an axial force to the operating knob along the axis of the shaft, so that the operating knob is unlocked and the shaft and cam are rotated under the action of the rotational movement applied to the operating knob by the operator; and a return spring, which is configured to be compressed when the operating knob moves to the operating position, and to apply a return force toward the locked position to the operating knob when the operator does not apply the axial force, so that the operating knob and the locking mechanism are reset from the operating position to the locked position.

[0005] In the above solution, by setting a cam-rotor transmission mechanism and a locking mechanism with axial unlocking function, the armrest position can be quickly adjusted and reliably locked. The overall structure is compact and easy to operate. After the operator releases the axial force, the return spring can automatically push the operating knob back to the locked position, completing the locking reset without additional user operation. This automatic return design not only improves the reliability of locking but also avoids the unlocked state due to user negligence, thereby reducing the risk of misoperation.

[0006] According to a preferred embodiment of this utility model, the operating knob includes a knob body and a knob sleeve fixedly connected to the knob body, with a radial through hole in the peripheral wall of the knob sleeve; the locking mechanism includes a locking sleeve and a spring-loaded locking pin, wherein the locking sleeve is fixedly connected to the mounting bracket and a locking toothed ring is formed on the outer periphery of the locking sleeve, the spring-loaded locking pin is movably mounted along the radial through hole and engages with the locking toothed ring in the locked position; and the rotating shaft extends through the central through hole of the locking sleeve and can rotate relative to the locking sleeve. This structure not only achieves the technical effects of simple operation and reliable locking, but also can accurately position the armrest during lifting, improving the safety and comfort of the driver.

[0007] According to one aspect of this utility model, the return spring is sleeved on the rotating shaft and located between the locking sleeve and the operating knob. In the locked position, the return spring is in a relaxed state; in the operating position, the return spring is in a compressed state.

[0008] In one specific embodiment, the locking sleeve has a first sleeve end, an opposing second sleeve end, and an annular flange located between the first sleeve end and the second sleeve end, wherein the first sleeve end is fixedly connected to the mounting bracket, the locking toothed ring is formed on the second sleeve end, and an annular groove is defined between the locking toothed ring and the annular flange.

[0009] In a preferred embodiment, an annular retaining ring is provided within the annular groove. When the operator applies an axial force to the operating knob along the axis of the rotating shaft, the spring-loaded locking pin disengages from the inter-tooth groove of the locking gear ring and passes over the retaining ring to reach the operating position. This allows the operating knob to smoothly reach the operating position, ensuring that the rotational motion of the rotating shaft and cam can reliably drive the armrest to move vertically. Preferably, the retaining ring has a first inclined surface and a second inclined surface, which are symmetrically arranged about the midplane of the retaining ring, allowing the locking pin to slide smoothly over the retaining ring, reducing wear and improving the operating feel and service life. This structure, in conjunction with the return spring, locking sleeve, and locking pin mechanism, achieves reliable locking and automatic reset of the operating knob and precise positioning of the armrest, thereby significantly improving operational safety, comfort, and device durability.

[0010] According to a preferred embodiment of the present invention, the radial through hole is a stepped hole, which includes a first hole segment with a first diameter and a second hole segment with a second diameter, wherein the second diameter is larger than the first diameter; the spring-loaded locking pin includes: a pin having a head and a pin body; a locking block fixedly connected to the tail end of the pin; and a spring sleeved on the pin body; the diameter of the head is larger than the first diameter and is arranged radially outward of the first hole segment; the size of the locking block is larger than the first diameter and is clearance-fitted with the second hole segment; the locking block has a third inclined surface, which faces the limiting retaining ring in the locked position.

[0011] In one embodiment of this invention, the armrest also includes a vertical support rod connected to the bottom of the armrest, wherein a cam is configured to always remain in contact with the lower end of the vertical support rod.

[0012] In a preferred embodiment, the adjustable armrest device further includes a first limiting rod and a second limiting rod arranged opposite to each other on both sides of the cam. The first limiting rod and the second limiting rod are both fixedly connected to the mounting bracket and parallel to the central axis of the rotating shaft, so as to ensure that the cam is always located directly below the lower end, thereby ensuring reliable contact between the cam and the armrest and realizing the smooth lifting and lowering of the armrest in the vertical direction.

[0013] This utility model also provides an engineering machine, whose cab includes the above-mentioned liftable armrest device.

[0014] This invention improves the smoothness and stability of the armrest during lifting and lowering by using precise cam drive and reliable locking. It can accurately adjust the height of the armrest according to the user's body shape and operating habits, thereby improving the comfort during driving or operation. At the same time, the reliable locking structure ensures that the armrest remains stable under vibration in the working environment, improving overall safety. Attached Figure Description

[0015] The features and advantages of this utility model will become clear from the following detailed description provided with reference to the accompanying drawings. It should be understood that the following drawings are merely schematic and not necessarily drawn to scale.

[0016] Figure 1 A perspective view of a height-adjustable armrest device according to an embodiment of the present invention is shown;

[0017] Figure 2 for Figure 1 An exploded view of the height-adjustable armrest device shown;

[0018] Figure 3a for Figure 2 The illustrated height-adjustable armrest device is shown in a cross-sectional view along the central axis of the rotating shaft, with the operating knob in the locked position.

[0019] Figure 3b for Figure 3a Enlarged view of part A in the image;

[0020] Figure 4a for Figure 2 The illustrated height-adjustable armrest device is shown in a cross-sectional view along the central axis of the rotating shaft, with the operating knob in the operating position.

[0021] Figure 4b for Figure 4a The enlarged view of section B shown;

[0022] Figure 5 A schematic diagram of the radial through hole in the knob sleeve of the operating knob 3, where the spring-loaded locking pin is assembled;

[0023] Figure 6a and Figure 6b The figures shown are a perspective view and a front view of the locking sleeve according to this utility model.

[0024] Figure 7a and Figure 7b The figures shown are a perspective view and a side view of the limiting retaining ring according to this utility model. Detailed Implementation

[0025] Embodiments of the present invention are described below with reference to the accompanying drawings. Numerous specific details are set forth in the following description to enable those skilled in the art to more fully understand and implement the present invention. Furthermore, it should be understood that the present invention is not limited to the specific embodiments described. Rather, the present invention can be practiced with any combination of the features and elements described below, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are for illustrative purposes only and should not be construed as elements or limitations of the claims unless expressly set forth in the claims.

[0026] The terms "first" and "second" are used below to describe the elements of this application. These terms are used only to distinguish the individual elements and not to limit the nature, order, or number of these elements. The terms "comprising" and "having" are used to indicate an open-ended inclusion and mean that there may be additional elements / components besides those listed.

[0027] Figure 1 and Figure 2 A specific embodiment of the adjustable armrest device 100 according to the present invention is shown. As can be seen from the figure, the adjustable armrest device 100 includes a mounting bracket 1, an armrest 2, an operating knob 3, a transmission mechanism 4, a locking mechanism 7, and a return spring 30.

[0028] In one specific embodiment, the mounting bracket 1 includes a base 1a, a spaced-apart first vertical plate 1b and second vertical plate 1c, and a top plate 1d formed by bending from the first vertical plate 1b toward the second vertical plate 1c. The top plate 1d has an opening, through which the armrest 2 passes a vertical support rod 20 at its bottom and is connected to the mounting bracket 1 in a vertically movable manner, thereby realizing the height adjustment of the armrest 2.

[0029] The transmission mechanism 4 includes a rotating shaft 5 and a cam 6. The first end 5a of the rotating shaft 5 passes through an opening 1e in the second vertical plate 1c of the mounting bracket 1 and extends below the vertical support rod 20. The cam 6 is rotatably fixed to the first end 5a of the rotating shaft 5, and the operating knob 3 is rotatably fixed to the second end 5b of the rotating shaft 5 (see [reference]). Figure 3a In this text, "rotationally fixed" means that there is no relative rotational freedom between the two components, that is, when one component is driven, the other component rotates accordingly. When the operating knob 3 is rotated around the rotating shaft 5, the rotating shaft 5 and the cam 6 are driven to rotate synchronously, so that the cam 6 applies a pushing action on the lower end 20a of the vertical support rod 20, thereby realizing the vertical lifting and lowering of the armrest 2. Preferably, the cam 6 always maintains contact with the lower end 20a of the vertical support rod 20 to ensure stable support.

[0030] In this embodiment, the operating knob 3 includes a knob body 31 and a knob sleeve 32 fixedly connected to the knob body 31. A radial through hole 33 is provided in the peripheral wall of the knob sleeve 32. The locking mechanism 7 includes a locking sleeve 8 and a spring-loaded locking pin 9, which is movably mounted along the radial through hole 33. One end of the locking sleeve is fixedly connected to an opening 1e in the second vertical plate 1c of the mounting bracket 1, and a locking toothed ring 80 is formed on the outer periphery of the other end of the locking sleeve 8. The operating knob 3 can move axially between a "locked position" and an "operating position" along the rotation shaft 5.

[0031] Figure 3a and Figure 3bThe diagram shows the operating knob 3 and locking mechanism 7 in the locked position, where the locking pin 9 engages with the locking gear ring 80, preventing the operating knob 3 from rotating. Figure 4a and Figure 4b The diagram shows the operating knob 3 and locking mechanism 7 in the operating position. At this position, the locking pin 9 is disengaged from the locking gear ring 80, and the operating knob 3 can rotate freely. The return spring 30 is sleeved on the rotating shaft 5 and arranged between the locking sleeve 8 and the operating knob 3; in the locked position, the return spring 30 is in a relaxed state, and in the operating position, it is in a compressed state.

[0032] See Figure 5 In a preferred embodiment, the radial through hole 33 is constructed as a stepped hole, including a first hole segment 33a and a second hole segment 33b, the diameter of the second hole segment being larger than that of the first hole segment. The spring-loaded locking pin 9 includes: a pin 91 having a head 91a and a pin body, a locking block 92 fixedly connected to the tail end of the pin, and a spring 93 sleeved on the pin body. The diameter of the head 91a is larger than the first diameter of the first hole segment 33a and is arranged radially outward of the first hole segment 33a. The size of the locking block 92 is larger than the first diameter of the first hole segment 33a and is clearance-fitted with the second hole segment 33b. The locking block 92 has a third inclined surface 92a.

[0033] See Figure 6a and Figure 6b A preferred embodiment of the locking sleeve 8 is shown. The locking sleeve 8 has a first sleeve end 81, an opposing second sleeve end 82, and an annular flange 83 located between the first sleeve end and the second sleeve end. The first sleeve end 81 is fixedly connected to an opening 1e in the first vertical plate 1c of the mounting bracket 1. The second sleeve end 82 forms a locking toothed ring 80, and an annular groove 84 is defined between the locking toothed ring 80 and the annular flange 83 for receiving an annular retaining ring 10. The rotating shaft 5 passes through the central through hole 8a of the locking sleeve and can rotate freely relative to it.

[0034] exist Figure 7a and Figure 7b An embodiment of the limiting ring 10 is shown. The annular limiting ring 10 has an annular first inclined surface 11 and an annular second inclined surface 12, and the first and second inclined surfaces are symmetrically arranged about the midplane 13 of the limiting ring.

[0035] When the operator moves along the axis of the rotating shaft 5 to the position Figure 3bWhen the operating knob 3, in the locking position shown, is subjected to an axial force F, it will move to the left in the direction of the arrow, thereby causing the spring-loaded locking pin 9 to move away from the inter-tooth groove 80a of the locking gear ring 80. As the operating knob moves further, the third inclined surface 92a of the locking block 92 of the pin 91 facing the limiting retaining ring 10 abuts against the second inclined surface 12 of the limiting retaining ring, and moves upward along the second inclined surface against the elastic force of the spring 93, passing over the limiting retaining ring 10 to reach the second inclined surface. Figure 4b The operation location is shown. (For example...) Figure 4b As shown, the locking block 92, under the elastic restoring force of the spring 93, simultaneously abuts against the annular flange 83 and the first inclined surface 11 of the limiting ring 10. Here, the limiting ring 10 also serves as a position indicator, prompting the operator that the operating knob 3 has reached the operating position and can be rotated. The rotating shaft 5 and cam 6 can be driven to rotate under the rotational motion applied by the operator to the operating knob 3, thereby adjusting the height of the armrest 2. After the height of the armrest 2 is adjusted, the operator can release the operating knob 3, i.e., no longer apply axial force to the operating knob. Since the return spring 30 is arranged between the operating knob 3 and the locking sleeve 8, after the operator releases the operating knob, the return spring 30 automatically returns the operating knob to the locked position. The locking mechanism adopts a "press to unlock, release to automatically lock" method to avoid accidental operation and achieve safe adjustment during driving. The locking pin automatically enters the inter-tooth slot under the action of the spring force, ensuring that the armrest can be reliably locked in any position without loosening.

[0036] In this utility model, in order to ensure that the cam 6 does not shift laterally during the support process, a first limiting rod 61 and a second limiting rod 62 are provided opposite to each other on both sides of the cam 6. The first limiting rod 61 is fixedly connected to the first vertical plate 1b of the mounting bracket 1, and the second limiting rod 62 is fixedly connected to the second vertical plate 1c of the mounting bracket 1. Both are parallel to the central axis of the rotating shaft 5, so as to limit the lateral position of the cam 6 and keep it always located directly below the lower end 20a.

[0037] Industrial applicability

[0038] The adjustable arm rest device according to this utility model can be applied to a variety of engineering machinery, such as graders, loaders, bulldozers or road rollers.

[0039] The following combination Figure 3b and Figure 4b The adjustment process of the adjustable armrest device is described as follows:

[0040] First, the operator moves along the axial direction of the rotating shaft 5 to the position of... Figure 3bThe operating knob 3, in the locked position shown, applies an axial force F, pushing it to move to the left in the direction of the arrow. This causes the spring-loaded locking pin 9 to disengage from the inter-tooth groove 80a of the locking ring 80. As the operating knob moves further, the third inclined surface 92a of the locking block 92 on the pin 91 abuts against the second inclined surface 12 of the limiting ring 10, and moves upward along this inclined surface against the spring force of the spring 93, then passes over the limiting ring 10 to reach... Figure 4b The operating position is shown. Under the elastic restoring force of the spring 93, the locking block 92 simultaneously abuts against the annular flange 83 and the first inclined surface 11 of the limiting ring 10, indicating to the operator that the operating knob 3 has reached the operating position and can be rotated.

[0041] Next, the operator applies a rotational motion to the operating knob 3, and the rotating shaft 5 and cam 6 transmit the rotational motion to the armrest 2, causing the armrest to rise and fall in the vertical direction, thereby realizing the adjustment of the armrest height.

[0042] After the height of the armrest 2 is adjusted, the operator releases the operating knob 3. At this time, due to the elastic restoring force of the return spring 30 arranged between the operating knob 3 and the locking sleeve 8, the operating knob 3 is pushed to move automatically to the right and return to the locked position. At the same time, the locking block 92 of the locking pin 9 engages with the tooth groove 80a under the action of the elastic restoring force of the spring 93.

[0043] The adjustable armrest device 100 of this utility model achieves the function of "press to unlock, release to lock" through the above-mentioned locking mechanism. During the reset process, the locking pin automatically engages with the toothed groove under the action of spring force, so that the armrest can be reliably locked at any height position, preventing loosening and ensuring operational safety.

[0044] Various modifications and variations can be made to the embodiments disclosed above without departing from the scope or spirit of this invention. Other embodiments of this invention will be apparent to those skilled in the art based on the practice of this invention disclosed in this specification. This specification and the examples disclosed herein should be considered illustrative only, and the true scope of this invention is defined by the appended claims and their equivalents.

Claims

1. A height-adjustable armrest device, characterized in that, The height-adjustable armrest device (100) includes: Mounting bracket (1); Armrest (2), which is connected to the mounting bracket (1) in a manner that allows it to move in the vertical direction; Operation knob (3); The transmission mechanism (4) includes a rotating shaft (5) and a cam (6), wherein the cam is rotatably fixed to the first end (5a) of the rotating shaft and the operating knob is rotatably fixed to the second end (5b) of the rotating shaft, thereby converting the rotational motion of the operating knob into the linear motion of the armrest in the vertical direction; A locking mechanism (7) is provided, wherein the operating knob (3) is movable between a locked position and an operating position along the axial direction of the rotating shaft (5). The locking mechanism is configured to: lock the rotation of the operating knob in the rotational direction in the locked position; and allow the operating knob to rotate in the rotational direction in the operating position. Unlocking of the locking mechanism is achieved by an operator applying an axial force to the operating knob along the axial direction of the rotating shaft (5), thereby unlocking the operating knob (3) and causing the rotating shaft (5) and the cam (6) to rotate under the rotational motion applied by the operator to the operating knob (3). A return spring (30) is configured to be compressed when the operating knob (3) moves to the operating position and to apply a return force toward the locking position to the operating knob when the operator does not apply the axial force, thereby resetting the operating knob and the locking mechanism from the operating position to the locking position.

2. The adjustable armrest device according to claim 1, characterized in that, The operating knob (3) includes a knob body (31) and a knob sleeve (32) fixedly connected to the knob body, and a radial through hole (33) is provided in the peripheral wall of the knob sleeve; The locking mechanism (7) includes a locking sleeve (8) and a spring-loaded locking pin (9), wherein the locking sleeve is fixedly connected to the mounting bracket (1) and a locking toothed ring (80) is formed on the outer periphery of the locking sleeve, and the spring-loaded locking pin is movably fitted along the radial through hole (33) and engages with the locking toothed ring (80) in the locked position; and The pivot (5) extends through the central through-hole (8a) of the locking sleeve and is rotatable relative to the locking sleeve.

3. The adjustable armrest device according to claim 2, characterized in that, The return spring (30) is sleeved on the rotating shaft (5) and located between the locking sleeve (8) and the operating knob (3). In the locked position, the return spring (30) is in a relaxed state; in the operating position, the return spring (30) is in a compressed state.

4. The adjustable armrest device according to claim 2, characterized in that, The locking sleeve (8) has a first sleeve end (81), an opposing second sleeve end (82), and an annular flange (83) located between the first sleeve end and the second sleeve end, wherein the first sleeve end (81) is fixedly connected to the mounting bracket (1), the locking tooth ring is formed on the second sleeve end (82), and an annular groove (84) is defined between the locking tooth ring (80) and the annular flange (83).

5. The adjustable armrest device according to claim 4, characterized in that, An annular retaining ring (10) is provided in the annular groove (84). When the operator applies axial force to the operating knob along the axis of the rotating shaft (5), the spring-loaded locking pin (9) disengages from the inter-tooth groove (80a) of the locking tooth ring (80) and passes through the retaining ring (10) to reach the operating position.

6. The adjustable armrest device according to claim 5, characterized in that, The limiting ring (10) has a first inclined surface (11) and a second inclined surface (12), and the first inclined surface and the second inclined surface are symmetrically arranged about the midplane (13) of the limiting ring.

7. The adjustable armrest device according to claim 5 or 6, characterized in that, The radial through hole (33) is a stepped hole, which includes a first hole segment (33a) having a first diameter and a second hole segment (33b) having a second diameter, wherein the second diameter is larger than the first diameter; The spring-loaded locking pin (9) includes: A pin (91) having a head (91a) and a pin body; A locking block (92) fixedly connected to the tail end of the pin; and A spring (93) fitted onto the pin; in: The diameter of the head (91a) is greater than the first diameter and is arranged radially outward of the first hole segment (33a); The locking block (92) is larger than the first diameter and is clearance-fitted with the second hole segment (33b); The locking block (92) has a third inclined surface (92a) which faces the limiting retaining ring in the locked position.

8. The adjustable armrest device according to any one of claims 1 to 6, characterized in that, The armrest (2) also includes a vertical support rod (20) connected to the bottom of the armrest (2), wherein the cam (6) is configured to always remain in contact with the lower end (20a) of the vertical support rod (20).

9. The adjustable armrest device according to claim 8, characterized in that, The adjustable armrest device also includes a first limiting rod (61) and a second limiting rod (62) arranged opposite to each other on both sides of the cam (6). The first limiting rod and the second limiting rod are both fixedly connected to the mounting bracket (1) and parallel to the central axis of the rotating shaft, so as to ensure that the cam is always located directly below the lower end (20a).

10. An engineering machinery, characterized in that, The construction machinery includes a liftable armrest device (100) according to any one of claims 1 to 9.

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