Assembling tool for center shaft assembly

Abstract

The utility model relates to the technical field of middle shaft assembly, and provides a middle shaft assembly assembling tool which comprises a base, a first-stage telescopic assembly and a second-stage telescopic assembly, a middle shaft can be fixed to the base, and the axial direction of the middle shaft is parallel to the first direction; the first-stage telescopic assembly comprises a first driving piece and a supporting plate, the first driving piece is installed on the base, and the first driving piece can adjust the distance between the supporting plate and the base in the first direction; and the second-stage telescopic assembly comprises a second driving piece and an extrusion piece, the second driving piece is installed on the supporting plate, and the second driving piece can drive the extrusion piece to extrude the torque sensor towards one side of the base in the first direction. In this way, automation of the assembling process of the center shaft and the torque sensor can be achieved through the assembling tool, manual participation is reduced, the operation quality is improved, the consistency of the operation quality is kept, and then the yield of products is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of middle shaft assembly, especially to a kind of assembling tool of middle shaft assembly. BACKGROUND

[0002] The middle shaft torque sensor is a sensor used in electric bicycles or high-end bicycles, installed at the middle shaft position of the bicycle, for measuring the torque applied by the rider when pedaling. It is one of the core components of the electric bicycle assist system, capable of achieving precise assist control and improving the riding experience.

[0003] Since the controller of the electric bicycle needs to adjust the power output of the motor according to the signal feedback by the torque sensor, there is a certain requirement for the measurement accuracy of the torque sensor. In addition to the factory settings of the torque sensor itself, the assembly accuracy of the torque sensor and the middle shaft directly affects its measurement accuracy.

[0004] During assembly, the torque sensor is fitted around the middle shaft and is fastened to the middle shaft by being squeezed axially, completing the assembly. Under the existing working conditions, this operation is generally manual work. Due to the characteristics of the torque sensor and the small machining gap of the parts, manual work is required to manually assist the compression of the parts during the manual work process to ensure the assembly accuracy of the parts. However, manual operation has unstable factors, so it cannot meet the quality requirements of full good products.

[0005] Therefore, there is an urgent need for an assembling tool for middle shaft assembly to solve the above technical problems. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide an assembling tool for middle shaft assembly, which can realize the automation of the assembly process of the middle shaft and the torque sensor, reduce manual intervention, improve work quality, maintain the consistency of work quality, and thus improve the yield of products.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] The assembling tool for middle shaft assembly includes a middle shaft and a torque sensor. The torque sensor is fitted around the middle shaft and can be fixed to the middle shaft. The assembling tool for middle shaft assembly includes:

[0009] A base, the middle shaft can be fixed to the base, and the axial direction of the middle shaft is parallel to the first direction;

[0010] A first-stage telescopic assembly, the first-stage telescopic assembly includes a first driving member and a support plate. The first driving member is installed on the base, and the first driving member can adjust the distance between the support plate and the base along the first direction.

[0011] The secondary telescopic assembly comprises a second driving member and a pressing member, the second driving member is installed on the support plate, and the second driving member can drive the pressing member to press the torque sensor to the base side in the first direction.

[0012] As a preferred technical solution of the assembly tool of the middle shaft assembly, the pressing member is a sleeve structure, and a clearance hole is formed in the sleeve structure, and the middle shaft can be inserted into the clearance hole.

[0013] As a preferred technical solution of the assembly tool of the middle shaft assembly, the base is provided with a waist-shaped hole, the length direction of the waist-shaped hole is perpendicular to the first direction, the middle shaft can be inserted into the waist-shaped hole and can slide relative to the base along the length direction of the waist-shaped hole to switch between the first position and the second position, in the first position, the torque sensor is aligned with the pressing member, and in the second position, the projection of the torque sensor and the secondary telescopic assembly in the first direction does not coincide.

[0014] As a preferred technical solution of the assembly tool of the middle shaft assembly, the base is provided with a limiting hole in the first position, the diameter of the limiting hole is D1, and D1>D2>D3>D4 is satisfied, D2 is the diameter of the torque sensor, D3 is the width of the waist-shaped hole, and D4 is the diameter of the middle shaft.

[0015] As a preferred technical solution of the assembly tool of the middle shaft assembly, the primary telescopic assembly further comprises a guide column, the guide column is fixed to the base, and the support plate is sleeved on the guide column and can move relative to the base along the axial direction of the guide column.

[0016] As a preferred technical solution of the assembly tool of the middle shaft assembly, the primary telescopic assembly further comprises an elastic member, the elastic member is installed on the support plate and can move relative to the support plate in the first direction or be fixed relative to the support plate.

[0017] As a preferred technical solution of the assembly tool of the middle shaft assembly, the elastic member comprises a first rod and a second rod, the first rod is fixed to the support plate, the second rod is inserted into the first rod, and the second rod always has a moving trend of extending out of the first rod.

[0018] As a preferred technical solution of the assembly tool of the middle shaft assembly, the secondary telescopic assembly further comprises a bracket, and the second driving member is installed on the support plate through the bracket away from the base.

[0019] As a preferred technical scheme of the assembly tool of the middle shaft assembly, the secondary telescopic assembly further comprises a guide sleeve, the guide sleeve is fixed with the support plate, and the extrusion piece is inserted into the guide sleeve along the first direction.

[0020] As a preferred technical scheme of the assembly tool of the middle shaft assembly, the middle shaft is installed on the base in the vertical direction, and a supporting leg is installed on the side of the base opposite to the secondary telescopic assembly.

[0021] The utility model discloses beneficial effects:

[0022] An assembly tool of a middle shaft assembly is provided, the middle shaft assembly comprising a middle shaft and a torque sensor, the torque sensor being sleeved on the middle shaft and being capable of being fixed with the middle shaft, the assembly tool of the middle shaft assembly comprising a base, a primary telescopic assembly and a secondary telescopic assembly. Wherein, the middle shaft is capable of being fixed on the base and the axial direction of the middle shaft is parallel to the first direction; the primary telescopic assembly comprises a first driving piece and a support plate, the first driving piece being installed on the base, and the first driving piece being capable of adjusting the distance between the support plate and the base along the first direction; the secondary telescopic assembly comprises a second driving piece and an extrusion piece, the second driving piece being installed on the support plate, and the second driving piece being capable of driving the extrusion piece to extrude the torque sensor to the side of the base along the first direction. Specifically, in use, after the middle shaft assembly and the base are assembled, the first driving piece is started, the first driving piece moves to a preset height by carrying the secondary telescopic assembly through the support plate, the first driving piece is locked, the relative fixation between the support plate and the base is maintained, and then the second driving piece is started, so that the extrusion piece applies a force to the torque sensor, and the torque sensor is assembled with the middle shaft.

[0023] In this way, the assembly tool can realize the automation of the assembly process of the middle shaft and the torque sensor, reduce the manual participation, improve the operation quality, maintain the consistency of the operation quality, and further improve the yield of products. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and the drawings by those skilled in the art without creating labor.

[0025] Figure 1 It is the structure schematic view of the assembly tool of the middle shaft assembly provided by the embodiments of the utility model;

[0026] Figure 2 It is the assembly schematic view of the assembly tool of the middle shaft assembly and the middle shaft assembly provided by the embodiments of the utility model;

[0027] Figure 3 is a side view of the middle shaft assembly provided by the embodiment of the utility model, and the assembly tool of the middle shaft assembly is assembled on the middle shaft assembly;

[0028] Figure 4 is a bottom view of the assembly tool of the middle shaft assembly provided by the embodiment of the utility model;

[0029] Figure 5 is an assembly schematic view of the two-stage telescopic assembly and the support plate provided by the embodiment of the utility model;

[0030] Figure 6 is a bottom view of the two-stage telescopic assembly provided by the embodiment of the utility model.

[0031] In the drawings:

[0032] X, first direction;

[0033] 100, middle shaft assembly; 110, middle shaft; 120, torque sensor;

[0034] 200, assembly tool;

[0035] 210, base; 211, waist-shaped hole; 212, limiting hole; 213, supporting leg; 214, bottom plate; 215, electric control cabinet;

[0036] 220, one-stage telescopic assembly; 221, first driving piece; 222, support plate; 223, elastic piece; 2231, first rod; 2232, second rod; 224, guide column; 225, linear bearing;

[0037] 230, two-stage telescopic assembly; 231, second driving piece; 232, extrusion piece; 2321, avoiding hole; 233, support; 234, guide sleeve. DETAILED DESCRIPTION

[0038] The utility model will be further explained in detail in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0039] In the description of the utility model, unless another definite provision and limitation, the term "link", "connection", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's interaction relationship.For the ordinary skill in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0040] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features is not direct contact but is through the contact between other features of them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0041] In the description of the embodiment, the terms "on", "under", "right", etc. Orientation or positional relationship based on the orientation or positional relationship shown in the drawing, only for the convenience of description and simplification operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0042] As Figures 1 to 6 The utility model provides a kind of assembly tooling 200 of middle shaft subassembly as shown in the attached drawings, middle shaft subassembly 100 includes middle shaft 110 and torque sensor 120, torque sensor 120 is set in middle shaft 110 and can be fixed with middle shaft 110, the assembly tooling 200 of middle shaft subassembly includes: base 210, primary telescopic component 220 and secondary telescopic component 230, wherein middle shaft 110 can be fixed to base 210 and the axial direction of middle shaft 110 is parallel with the first direction X;Primary telescopic component 220 includes first driving part 221 and support plate 222, first driving part 221 is installed to base 210, and first driving part 221 can adjust the interval between support plate 222 and base 210 along the first direction X;Secondary telescopic component 230 includes second driving part 231 and extrusion piece 232, second driving part 231 is installed to support plate 222, and second driving part 231 can drive extrusion piece 232 to the extrusion of torque sensor 120 to base 210 side along the first direction X.

[0043] Exemplarily, after the middle shaft 110 is installed on the base 210, the axial direction of the middle shaft 110 is parallel to the first direction X, the middle shaft 110 is relatively fixed with the base 210, in the first telescopic assembly 220, the first driving member 221 is a cylinder, the shell of the first driving member 221 is relatively fixed with the base 210, the telescopic cylinder of the first driving member 221 is installed with a support plate 222, the telescopic cylinder can be telescoped along the first direction X, thereby driving the support plate 222 to move along the first direction X; in the second telescopic assembly 230, the second driving member 231 is a cylinder, the shell of the second driving member 231 is relatively fixed with the support plate 222, the telescopic cylinder of the second driving member 231 is installed with a pressing member 232, the telescopic cylinder can move along the first direction X, thereby driving the pressing member 232 to move along the first direction X, the pressing member 232 is used to abut against the torque sensor 120 in the middle shaft assembly 100 along the first direction X, and can apply a force to the torque sensor 120 along the first direction X, so that the torque sensor 120 moves relative to the middle shaft 110 along the first direction X to the side of the base 210, until it is fixed with the middle shaft 110.

[0044] Specifically, in use, after the middle shaft assembly 100 and the base 210 are assembled, the first driving member 221 is started, the first driving member 221 moves the second telescopic assembly 230 to a preset height through the support plate 222, the first driving member 221 is locked, keeping the relative fixation of the support plate 222 and the base 210, then the second driving member 231 is started, so that the pressing member 232 applies a force to the torque sensor 120, so that it is assembled with the middle shaft 110.

[0045] In this way, the assembly tool 200 can realize the automation of the assembly process of the middle shaft 110 and the torque sensor 120, reduce the manual participation, improve the operation quality, keep the consistency of the operation quality, and thus improve the yield of the product.

[0046] Further, the second driving member 231 is a cylinder, the second driving member 231 can drive the pressing member 232 to perform piston movement along the first direction X, that is, the pressing member 232 reciprocates along the first direction X within a unit time, and impacts the torque sensor 120 multiple times to compact the torque sensor 120 and the middle shaft 110.

[0047] Exemplarily, the base 210 includes a bottom plate 214 and an electric control cabinet 215, the electric control cabinet 215 is fixed to the bottom plate 214, and the electric control cabinet 215 and the bottom plate 214 are arranged in an L shape.

[0048] It should be noted that in the middle shaft assembly 100, a first bearing, a second bearing and a circlip are further included, wherein the inner ring of the first bearing is fixed to one end of the middle shaft 110, the torque sensor 120, the second bearing and the circlip are sequentially sleeved on the other end of the middle shaft 110, under the action of the extrusion piece 232, one axial end of the torque sensor 120 can be fixed to the outer ring of the second bearing, and the other axial end can be fixed to the outer ring of the first bearing, the locking of the circlip and the middle shaft 110, and the locking of the circlip and the first bearing lock the second bearing and the torque sensor 120 on the middle shaft 110. That is, the extrusion piece 232 directly acts on the circlip, and the force is sequentially conducted between the circlip, the first bearing and the torque sensor 120.

[0049] Optionally, the extrusion piece 232 is a sleeve structure, and a relief hole 2321 is formed, and the middle shaft 110 can be inserted into the relief hole 2321.

[0050] For example, when the middle shaft 110 is installed on the base 210, the extrusion piece 232 is coaxially arranged with the middle shaft 110, the middle shaft 110 and the relief hole 2321 are arranged in the first direction X and are aligned, when the second driving piece 231 drives the extrusion piece 232 to press the torque sensor 120, the middle shaft 110 can be inserted into the relief hole 2321, and the axial end surface of the relief hole 2321 can act on the axial end surface of the torque sensor 120 along the first direction X, and press the torque sensor 120 to the side of the base 210, to complete the assembly of the torque sensor 120 and the middle shaft 110, and the sleeve structure has the same force acting on the axial end surface of the torque sensor 120, which can avoid the dislocation of the torque sensor 120 and the middle shaft 110.

[0051] Optionally, the base 210 is provided with a waist-shaped hole 211, the length direction of the waist-shaped hole 211 is perpendicular to the first direction X, the middle shaft 110 can be inserted into the waist-shaped hole 211 and can slide along the length direction of the waist-shaped hole 211 relative to the base 210, to switch between the first position and the second position, in the first position, the torque sensor 120 is aligned with the extrusion piece 232, in the second position, the projection of the torque sensor 120 and the two-stage telescopic assembly 230 in the first direction X does not coincide.

[0052] For example, the depth direction of the waist-shaped hole 211 is parallel to the first direction X, the second position for completing the preliminary installation of the middle shaft 110 and the base 210 and the first position for completing the alignment of the middle shaft 110 and the extrusion piece 232 are defined on the base 210, and the two ends of the length direction of the waist-shaped hole 211 are formed at the first position and the second position respectively. Since the second position is not blocked by the extrusion piece 232 in the first direction X, it is convenient for the preliminary assembly of the middle shaft 110 and the base 210. The middle shaft 110 is inserted into the waist-shaped hole 211 in the second position, at this time, the side wall in the width direction of the waist-shaped hole 211 can limit the swing of the middle shaft 110 relative to the base 210.

[0053] Optionally, the base 210 is provided with a limiting hole 212 in the first position, the diameter of the limiting hole 212 is D1, and it satisfies D1>D2>D3>D4, D2 is the diameter of the torque sensor 120, D3 is the width of the waist-shaped hole 211, and D4 is the diameter of the central shaft 110.

[0054] In this way, when the central shaft assembly 100 moves to the first position, the central shaft 110 and part of the torque sensor 120 can be inserted into the limiting hole 212, and the inner peripheral wall of the limiting hole 212 can limit the outer side wall of the torque sensor 120.

[0055] Optionally, the first telescopic assembly 220 further comprises a guide column 224, the guide column 224 is fixed to the base 210, and the support plate 222 is sleeved on the guide column 224 and can move along the axial direction of the guide column 224 relative to the base 210.

[0056] Specifically, the axial direction of the guide column 224 is parallel to the first direction X, one end of the guide column 224 is fixed to the base 210, and the other end is inserted into the support plate 222, when the first driving member 221 is started, the support plate 222 can move towards the base 210 along the guide column 224, thereby standardizing the movement track of the support plate 222, so that the second telescopic assembly 230 can keep an aligned relationship with the central shaft assembly 100.

[0057] Further, the support plate 222 is connected with the guide column 224 through a linear bearing 225, so as to reduce the friction between the support plate 222 and the guide column 224.

[0058] Illustratively, the guide column 224 is provided with a plurality of guide columns, which are respectively installed on the base 210, so as to keep the movement of the support plate 222 stable.

[0059] Optionally, the first telescopic assembly 220 further comprises a resilient member 223, the resilient member 223 is installed on the support plate 222 and can move relative to the support plate 222 along the first direction X or be fixed relative to the support plate 222. Specifically, in use, the distance between the resilient member 223 and the base 210 can be adjusted according to the height of the central shaft assembly 100 and the stroke distance of the first driving member 221 along the first direction X, when the first driving member 221 drives the support plate 222 to move towards one side of the base 210, one end of the resilient member 223 can be in contact with the base 210, as the first driving member 221 continues to feed, the resilient member 223 is elastically deformed to buffer and limit the further feeding of the first driving member 221.

[0060] Optionally, the elastic member 223 comprises a first rod 2231 and a second rod 2232, the first rod 2231 is fixed with the support plate 222, and the second rod 2232 is inserted into the first rod 2231, and the second rod 2232 always has a moving trend of extending out of the first rod 2231.

[0061] Illustratively, the support plate 222 is provided with a threaded hole along the first direction X, the first rod 2231 is inserted into the threaded hole and is threadedly connected with the support plate 222, and the second rod 2232 is inserted into the first rod 2231, and the first rod 2231 is provided with a hydraulic system, so that the second rod 2232 always has a moving trend of extending out of the first rod 2231. The end of the second rod 2232 away from the first rod 2231 is used to abut against the base 210.

[0062] Illustratively, the first rod 2231 can also be provided with a spring or other elastic part, so that the first rod 2231 always has a moving trend of extending out of the second rod 2232.

[0063] Optionally, the secondary telescopic assembly 230 further comprises a support 233, and the second driving member 231 is installed on the support plate 222 through the support 233 away from the base 210.

[0064] Illustratively, the support 233 is a gantry structure, and the second driving member 231 is installed at the central position of the support 233, so that the stability of the second driving member 231 relative to the support plate 222 can be maintained.

[0065] Optionally, the secondary telescopic assembly 230 further comprises a guide sleeve 234, and the guide sleeve 234 is fixed with the support plate 222, and the extrusion member 232 is inserted into the guide sleeve 234 along the first direction X. In this way, the guide sleeve 234 can limit the swing of the extrusion member 232 relative to the support plate 222, standardize the movement track of the extrusion member 232, and ensure the operation quality of the extrusion member 232 on the torque sensor 120.

[0066] Illustratively, the support plate 222 is provided with a through hole along the first direction X, and the guide sleeve 234 is installed on the support plate 222 through a flange structure and is fixed with the axial end face of the through hole.

[0067] Further, the guide sleeve 234 is installed on the side of the support plate 222 away from the base 210, and makes a reservation for the installation of the central shaft assembly 100 and the base 210.

[0068] Optionally, the central shaft 110 is installed on the base 210 along the vertical direction, and the base 210 is provided with a support leg 213 away from the secondary telescopic assembly 230.

[0069] In this way, the base 210 is stably placed by buffering the pressing piece 232 through the setting of the supporting leg 213, and the impact on the base 210 is buffered when the torque sensor 120 is operated.

[0070] In addition, the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An assembly fixture for a central shaft assembly, the central shaft assembly (100) comprising a central shaft (110) and a torque sensor (120), the torque sensor (120) being sleeved on the central shaft (110) and capable of being fixed to the central shaft (110), characterized in that, The assembly fixture for the central axis assembly includes: A base (210), wherein the central shaft (110) is fixed to the base (210) and the axis of the central shaft (110) is parallel to the first direction (X); A primary telescopic assembly (220) includes a first driving member (221) and a support plate (222). The first driving member (221) is mounted on the base (210). The first driving member (221) is capable of adjusting the distance between the support plate (222) and the base (210) along the first direction (X). The secondary telescopic assembly (230) includes a second driving member (231) and a pressing member (232). The second driving member (231) is mounted on the support plate (222). The second driving member (231) can drive the pressing member (232) to press the torque sensor (120) towards the base (210) along the first direction (X).

2. The assembly fixture for the central shaft assembly according to claim 1, characterized in that, The extrusion member (232) is a sleeve structure with a clearance hole (2321), and the central shaft (110) can be inserted into the clearance hole (2321).

3. The assembly fixture for the central shaft assembly according to claim 1, characterized in that, The base (210) has an oblong hole (211) with the length direction of the oblong hole (211) perpendicular to the first direction (X). The central shaft (110) can be inserted into the oblong hole (211) and can slide relative to the base (210) along the length direction of the oblong hole (211) to switch between a first position and a second position. In the first position, the torque sensor (120) is aligned with the extrusion member (232). In the second position, the projections of the torque sensor (120) and the secondary telescopic assembly (230) in the first direction (X) do not coincide.

4. The assembly fixture for the central shaft assembly according to claim 3, characterized in that, The base (210) has a limiting hole (212) at the first position. The diameter of the limiting hole (212) is D1, which satisfies the following condition: D1 > D2 > D3 > D4. D2 is the diameter of the torque sensor (120), D3 is the width of the waist-shaped hole (211), and D4 is the diameter of the central shaft (110).

5. The assembly fixture for the central shaft assembly according to claim 1, characterized in that, The primary telescopic assembly (220) further includes a guide post (224), which is fixed to the base (210). The support plate (222) is sleeved on the guide post (224) and can move relative to the base (210) along the axial direction of the guide post (224).

6. The assembly fixture for the central shaft assembly according to claim 1, characterized in that, The primary telescopic component (220) further includes an elastic element (223), which is mounted on the support plate (222) and is capable of moving relative to the support plate (222) or being fixed relative to the support plate (222) along the first direction (X).

7. The assembly fixture for the central shaft assembly according to claim 6, characterized in that, The elastic element (223) includes a first rod (2231) and a second rod (2232). The first rod (2231) is fixed to the support plate (222), and the second rod (2232) is inserted into the first rod (2231). The second rod (2232) always has a tendency to extend out of the first rod (2231).

8. The assembly fixture for the central shaft assembly according to claim 1, characterized in that, The secondary telescopic assembly (230) also includes a bracket (233), and the side of the second drive member (231) facing away from the base (210) is mounted on the support plate (222) via the bracket (233).

9. The assembly fixture for the central shaft assembly according to claim 1, characterized in that, The secondary telescopic assembly (230) further includes a guide sleeve (234), which is fixed to the support plate (222), and the extrusion member (232) is inserted into the guide sleeve (234) along the first direction (X).

10. The assembly fixture for the central shaft assembly according to claim 1, characterized in that, The central shaft (110) is mounted vertically on the base (210), and the base (210) has a support leg (213) mounted on the side opposite to the secondary telescopic assembly (230).

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