Fixing device for work parts and snow blower

Abstract

The utility model provides a kind of fixing device and snow sweeper convenient to replace working component, it is related to the technical field of snow sweeping equipment.The fixing device convenient to replace working component includes movable support assembly and opening machine cover;Movable support assembly includes installation base, support piece and linkage, installation base is fixedly installed on a support side plate, one end of opening machine cover is pivoted on installation base, the other end of opening machine cover is connected with support piece by linkage, one end of linkage is pivoted with opening machine cover, and the other end is pivoted with support piece;Support piece is slidably inserted in installation base, and the rotating shaft of working component is inserted in support piece.The snow sweeper includes the fixing device convenient to replace working component.The technical effect of reducing the difficulty of replacing working component is achieved.

Description

Technical Field

[0001] This utility model relates to the field of snow removal equipment technology, and more specifically, to a fixing device and a snow remover that facilitates the replacement of working parts. Background Technology

[0002] A push snowplow is a lightweight, efficient, and environmentally friendly winter snow removal tool, ideal for clearing snow from small to medium-sized areas such as sidewalks, paths, patios, and garage doors. Unlike large gasoline or electric snow blowers, it does not require a power source and is entirely powered by human effort, thus offering advantages such as zero emissions, no noise, simple maintenance, and low cost.

[0003] The working parts of the existing push snow sweepers on the market are detachable and installable. The working parts are assembled by fixing them to the snow sweeper on both sides to maintain their fixed support. After the working parts are assembled, if it is necessary to replace or maintain the working parts, it is necessary to remove the fixing plates on both sides of the snow sweeper. However, removing the fixing plates to replace the working parts involves a large number of parts and the process is extremely cumbersome. Utility Model Content

[0004] The purpose of this utility model is to provide a fixing device and snow sweeper that facilitate the replacement of working parts, so as to alleviate the technical problem of cumbersome replacement of working parts in the prior art.

[0005] In a first aspect, this utility model embodiment provides a fixing device for easy replacement of working parts, including a movable support assembly and an openable cover; The movable support assembly includes a mounting base, a support member, and a linkage member. The mounting base is fixedly mounted on a support side plate. One end of the opening cover is pivotally connected to the mounting base. The other end of the opening cover is connected to the support member through the linkage member. One end of the linkage member is pivotally connected to the opening cover, and the other end is pivotally connected to the support member. The support is slidably inserted into the mounting base, and the rotating shaft of the working part is inserted into the support.

[0006] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the support member includes a support base and a connecting base; The connecting base is fixed on the supporting base, the supporting base is slidably inserted into the mounting base, and a supporting shaft for supporting the rotating shaft is rotatably provided inside the supporting base. The connecting base is connected to the opening cover via the linkage component, and the inner wall of the opening cover can press the connecting base tightly.

[0007] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the mounting base is provided with a conical channel, and one side of the support base has a conical seat adapted to the conical channel.

[0008] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the other side of the aforementioned support base has an angle limiting member, and the mounting base is provided with an angle limiting groove adapted to the angle limiting member.

[0009] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the above-mentioned linkage component includes a linkage shaft and two linkage brackets; The two linkage brackets are arranged in a cross manner, and one end of each linkage bracket is sleeved on the linkage shaft, which is pivotally connected to the opening cover. The other end of the two linkage brackets is pivotally connected to the connecting base, and the connecting base is provided with linkage slots, the extension direction of which is parallel to the axial direction of the working component.

[0010] In conjunction with the first aspect, this utility model embodiment provides one possible implementation of the first aspect, wherein a linkage pin is provided at the end of the linkage bracket away from the linkage shaft, and the linkage pin is inserted into the linkage slot.

[0011] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein a spring-loaded reset member is sleeved on the aforementioned linkage shaft, and the spring-loaded reset member is located between the two linkage brackets.

[0012] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the above-mentioned fixing device for facilitating the replacement of working parts further includes a fixing support assembly, the fixing support assembly including a fixing support shaft and a support component; The fixed support shaft is mounted on the support side plate of the snow sweeper via a support component, and the support side plate is provided with a pressure plate for pressing the support component; The rotating shaft is inserted into one end of the fixed support shaft.

[0013] In conjunction with the first aspect, this utility model embodiment provides one possible implementation of the first aspect, wherein a transmission wheel is threadedly connected to the end of the fixed support shaft away from the rotating shaft.

[0014] Secondly, this utility model embodiment provides a snow sweeper, including the aforementioned fixing device for facilitating the replacement of working parts.

[0015] Beneficial effects: This utility model provides a fixing device for easy replacement of working parts, including a movable support assembly and an opening cover; the movable support assembly includes a mounting base, a support member, and a linkage member. The mounting base is fixedly mounted on a support side plate. One end of the opening cover is pivotally connected to the mounting base, and the other end of the opening cover is connected to the support member through the linkage member. One end of the linkage member is pivotally connected to the opening cover, and the other end is pivotally connected to the support member; the support member is slidably inserted into the mounting base, and the rotation shaft of the working part is inserted into the support member.

[0016] Specifically, when a user needs to replace the working parts of the snow sweeper, the user opens the opening cover, allowing it to rotate around the mounting base. During this rotation, the opening cover drives the linkage to rotate relative to both the opening cover and the support component. When the opening cover rotates to a set height, the linkage moves away from the support side plate along with the opening cover, thereby pulling the support component out of the mounting base. This removes the support component from the rotation axis of the working part, leaving one end of the working part unrestrained. The user can then remove the working part for replacement or maintenance.

[0017] This utility model provides a snowplow, including a fixing device for easy replacement of working parts. The snowplow has the advantages described above compared to the prior art, which will not be elaborated further here. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the fixing device for facilitating the replacement of working parts provided in this embodiment of the utility model during use; Figure 2 A schematic diagram of a fixing device for facilitating the replacement of working parts provided in an embodiment of this utility model; Figure 3 A schematic diagram of the movable support assembly in the fixing device for easy replacement of working parts provided in an embodiment of the present utility model; Figure 4 A schematic diagram of the movable support component of the fixing device for easy replacement of working parts provided in this embodiment of the utility model when the linkage bracket is installed; Figure 5 A schematic diagram of the opening of the machine cover in a fixing device for facilitating the replacement of working parts, provided in an embodiment of this utility model; Figure 6A schematic diagram of the mounting base in the fixing device for facilitating the replacement of working parts provided in an embodiment of this utility model; Figure 7 A schematic diagram of the upper support base in the fixing device for facilitating the replacement of working parts provided in an embodiment of this utility model; Figure 8 A schematic diagram of the connecting base in the fixing device for facilitating the replacement of working parts provided in an embodiment of this utility model; Figure 9 A schematic diagram of the linkage bracket in the fixing device for facilitating the replacement of working parts provided in an embodiment of this utility model; Figure 10 A schematic diagram of the support shaft in the fixing device for facilitating the replacement of working parts provided in an embodiment of this utility model; Figure 11 A schematic diagram of the working components in the fixing device for easy replacement of working components provided in an embodiment of this utility model; Figure 12 A cross-sectional view of the fixing device for facilitating the replacement of working parts provided in this embodiment of the utility model when it is not opened; Figure 13 A cross-sectional view of the fixing device for facilitating the replacement of working parts provided in an embodiment of the present utility model when opened; Figure 14 A cross-sectional view showing the connection between the fixing support assembly and the working component of the fixing device for facilitating the replacement of working components, provided in an embodiment of this utility model.

[0020] icon: 10-Support side plate; 11-Pressure plate; 20-Working part; 30-Rotating shaft; 100-Modible support assembly; 110-Mounting base; 111-Conical channel; 112-Angle limiting groove; 120-Support component; 121-Support base; 122-Connecting base; 123-Support shaft; 124-Conical seat; 125-Angle limiting component; 126-Linkage slot hole; 127-Polygonal hole; 128-Shaft stop limiting component; 130-Linkage component; 131-Linkage shaft; 132-Linkage bracket; 133-Linkage pin; 134-Elastic reset component; 135-Allowing groove; 200 - Open the machine cover; 201 - Fixing bolt; 210 - Clamping block; 300 - Fixed support assembly; 310 - Fixed support shaft; 320 - Drive wheel. Detailed Implementation

[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0026] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14 As shown, this embodiment provides a fixing device for easy replacement of working parts, including a movable support assembly 100 and an opening cover 200; the movable support assembly 100 includes a mounting base 110, a support member 120 and a linkage member 130. The mounting base 110 is fixedly mounted on a support side plate 10. One end of the opening cover 200 is pivotally connected to the mounting base 110, and the other end of the opening cover 200 is connected to the support member 120 through the linkage member 130. One end of the linkage member 130 is pivotally connected to the opening cover 200, and the other end is pivotally connected to the support member 120; the support member 120 is slidably inserted into the mounting base 110, and the rotation shaft 30 of the working part 20 is inserted into the support member 120.

[0027] Specifically, when the user needs to replace the working part 20 of the snow sweeper, the user opens the opening cover 200, causing the opening cover 200 to rotate around the mounting base 110. During the rotation of the opening cover 200, the opening cover 200 can drive the linkage 130 to rotate relative to both the opening cover 200 and the support 120. When the opening cover 200 rotates to the set height, the linkage 130 can move away from the support side plate 10 along with the opening cover 200, thereby pulling the support 120 out of the mounting base 110, so that the support 120 is away from the rotation axis 30 of the working part 20. At this time, one end of the working part 20 is unrestrained, and the user can take out the working part 20 for replacement or maintenance.

[0028] One end of the working component 20 can be supported by the movable support assembly 100, and the other end can be directly installed on the support side plate 10 of the snow sweeper through bearings and other components. When the movable support assembly 100 is in the initial support position, the two ends of the rotation shaft 30 of the working component 20 are constrained, which can ensure the normal operation of the working component 20.

[0029] In addition, the mounting base 110 is fixedly mounted on the support side plate 10 of the snow sweeper with screws to ensure the stability of the mounting base 110.

[0030] It should be noted that when the cover 200 is not open, the cover 200 is connected to the mounting base 110 by the fixing bolts 201 to prevent the working part 20 from falling off if the cover 200 is accidentally opened during daily use. When the working part 20 needs to be replaced or maintained, the user can remove the fixing bolts 201 that connect the cover 200 and the mounting base 110.

[0031] It should be noted that the fixing device for easy replacement of working parts provided in this embodiment can be used for snow sweepers, weeders or other equipment. Those skilled in the art can choose the application equipment according to their needs, which will not be elaborated here. This embodiment takes a snow sweeper as an example.

[0032] See Figures 1-14 As shown, in the optional embodiment, the support member 120 includes a support base 121 and a connecting base 122; the connecting base 122 is fixed on the support base 121, the support base 121 is slidably inserted on the mounting base 110, and a support shaft 123 for supporting the rotating shaft 30 is rotatably provided inside the support base 121; the connecting base 122 is connected to the opening cover 200 through the linkage member 130, and the inner wall of the opening cover 200 can press the connecting base 122 tightly.

[0033] Specifically, the support base 121 is slidably inserted into the mounting base 110, the connecting base 122 is fixed to the support base 121 by bolts, and the support shaft 123 is rotatably arranged in the support base 121. The support base 121 is provided with a bearing to support the support shaft 123, and the support base 121 and the support shaft 123 are provided with shaft stop limiting members 128, which are used to limit the position of the bearing and the support shaft 123.

[0034] The support base 121 has a bearing seat in its center for mounting bearings. A positioning ring is located in the center of the bearing seat, and two bearings are installed inside the bearing seat, positioned on either side of the positioning ring. A shaft stop limiting member 128 is located outside the two bearings, limiting their position. After the connecting base 122 is connected to the support base 121, the center of the connecting base 122 can limit the bearing position. A support shaft 123 is installed inside the bearings, and a shaft stop limiting member 128 is provided on the support shaft 123. This arrangement allows the support shaft 123 to move synchronously with the bearings.

[0035] It should be noted that when the cover 200 is not open, the clamping block 210 on the inner wall of the cover 200 can abut against the connecting base 122, thereby restricting the axial movement of the connecting base 122 and the support base 121, and ensuring that the support shaft 123 in the support base 121 stably supports the rotating shaft 30 of the working component 20.

[0036] The support shaft 123 supports one end of the rotating shaft 30, which has a polygonal hole 127. The end of the rotating shaft 30 is polygonal and can be inserted into the polygonal hole 127.

[0037] See Figures 1-14As shown, in an optional embodiment, the mounting base 110 has a conical channel 111, and one side of the supporting base 121 has a conical seat 124 that is adapted to the conical channel 111.

[0038] Specifically, a conical channel 111 is provided on the mounting base 110, and a conical seat 124 is provided on one side of the support base 121. By setting the conical channel 111 and the conical seat 124, the axial direction of the support shaft 123 can be ensured to coincide with the axial direction of the rotating shaft 30, ensuring the normal operation of the working part 20 and improving its service life.

[0039] See Figures 1-14 As shown, in the optional solution of this embodiment, the other side of the support base 121 has an angle limiting member 125, and the mounting base 110 has an angle limiting groove 112 adapted to the angle limiting member 125.

[0040] Specifically, an angle limiting member 125 is provided on the other side of the support base 121, and an angle limiting groove 112 is provided on the mounting base 110. When the support base 121 is inserted into the mounting base 110, that is, when the conical seat 124 is inserted into the conical channel 111, the angle limiting member 125 will fall into the angle limiting groove 112. Through the setting of the angle limiting member 125 and the angle limiting groove 112, the circumferential direction can be limited, and the support base 121 and the connecting base 122 are prevented from being rotated by the working part 20.

[0041] Among them, the angle limiting component 125 can be a limiting block.

[0042] See Figures 1-14 As shown, in the optional embodiment, the linkage 130 includes a linkage shaft 131 and two linkage brackets 132; the two linkage brackets 132 are arranged crosswise, one end of the two linkage brackets 132 is sleeved on the linkage shaft 131, and the linkage shaft 131 is pivotally connected to the opening cover 200; the other end of the two linkage brackets 132 is pivotally connected to the connecting base 122, and the connecting base 122 is provided with a linkage slot 126, the extension direction of the linkage slot 126 being parallel to the axial direction of the working component 20.

[0043] Among them, the linkage bracket 132 is provided with a linkage pin 133 at the end away from the linkage shaft 131, and the linkage pin 133 is inserted into the linkage slot 126.

[0044] Specifically, one end of each of the two linkage brackets 132 is pivotally connected to the opening cover 200, and the other end is pivotally connected to the connecting base 122. When the top of the opening cover 200 rotates open around the mounting base 110, the bottom of the opening cover 200 swings upward. The linkage brackets 132 pivotally connected to the bottom of the opening cover 200 can swing upward with the opening cover 200. The linkage brackets 132 rotate around the linkage shaft 131. When the opening cover 200 rotates upward to the set height, the linkage pin 133 at the other end of the linkage bracket 132 can abut against the linkage slot 126 of the connecting base 122. Then, as the opening cover 200 continues to rise, the linkage brackets 132 can pull the connecting base 122 outward, so that the connecting base 122 drives the support base 121 to be pulled out from the mounting base 110, so that the support shaft 123 moves away from the rotation shaft 30 of the working part 20. At this time, the user can disassemble the working part 20.

[0045] It should be noted that both linkage brackets 132 have clearance grooves 135 in the middle, which reduces the assembly thickness of the two linkage brackets 132. Furthermore, the clearance grooves 135 also limit the opening and closing angle of the two linkage brackets 132.

[0046] It should be noted that the extension length of the linkage slot 126 is greater than the diameter of the linkage pin 133, so that the linkage pin 133 can slide a distance within the linkage slot 126, which can ensure the normal movement of the opening cover 200 and the linkage component 130, while ensuring that the opening cover 200 can be completely closed.

[0047] See Figures 1-14 As shown, in the optional embodiment, a spring reset member 134 is sleeved on the linkage shaft 131, and the spring reset member 134 is located between the two linkage brackets 132.

[0048] Specifically, a spring-loaded reset component 134 is fitted onto the linkage shaft 131. The spring-loaded reset component 134 ensures that the linkage pins 133 on the two linkage brackets 132 have a pre-tightening force to press into the linkage slots 126 of the connecting base 122, thus preventing the linkage pins 133 on the linkage brackets 132 from falling out of the linkage slots 126 of the connecting base 122 during daily use.

[0049] During installation, workers can install the bottom of the two linkage brackets 132, which will press the elastic reset piece 134 and increase the top angle of the two linkage brackets 132. This will make the distance between the linkage pins 133 at the top of the two linkage brackets 132 greater than the distance between the two linkage slots 126 on the connecting base 122, making it easier for workers to install the linkage pins 133 into the linkage slots 126.

[0050] Among them, the elastic reset component 134 adopts a compression spring.

[0051] See Figures 1-14 As shown, in the optional embodiment, the fixing device for facilitating the replacement of working parts further includes a fixing support assembly 300. The fixing support assembly 300 includes a fixing support shaft 310 and a support component. The fixing support shaft 310 is mounted on the support side plate 10 of the snow sweeper through the support component. The support side plate 10 is provided with a pressure plate 11 for pressing the support component. The rotating shaft 30 is inserted into one end of the fixing support shaft 310.

[0052] The supporting components can be rotating support structures such as bearings or bushings. Those skilled in the art can choose according to actual needs, and will not elaborate further here.

[0053] The fixed support shaft 310 has a drive wheel 320 threadedly connected to the end away from the rotating shaft 30.

[0054] Specifically, the other end of the working component 20 can be supported by a fixed support assembly 300. A polygonal hole 127 is provided on the fixed support shaft 310. The rotating shaft 30 of the working component 20 can be inserted into the fixed support shaft 310. A transmission wheel 320 is threadedly connected to the end of the fixed support shaft 310 away from the rotating shaft 30. The transmission wheel 320 can drive the working component 20 to rotate to perform snow sweeping work.

[0055] The snow sweeper has a bearing seat on its support side wall, and a bearing for supporting the fixed support shaft 310 is installed in the bearing seat. A pressure plate 11 is installed on the support side wall, which can press down on the outer ring of the bearing. The transmission wheel 320 is threadedly connected to the fixed support shaft 310 and can press down on the inner ring of the bearing.

[0056] This embodiment provides a snowplow, including a fixing device for easy replacement of working parts.

[0057] Specifically, the snow sweeper provided in this embodiment has the advantage of the aforementioned fixing device that facilitates the replacement of working parts compared with the prior art, which will not be elaborated here.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fixing device for facilitating the replacement of working parts, characterized in that, include: Active support assembly (100) and openable cover (200); The movable support assembly (100) includes a mounting base (110), a support member (120), and a linkage member (130). The mounting base (110) is fixedly mounted on a support side plate (10). One end of the opening cover (200) is pivotally connected to the mounting base (110), and the other end of the opening cover (200) is connected to the support member (120) through the linkage member (130). One end of the linkage member (130) is pivotally connected to the opening cover (200), and the other end is pivotally connected to the support member (120). The support member (120) is slidably inserted into the mounting base (110), and the rotation shaft (30) of the working part (20) is inserted into the support member (120).

2. The fixing device for facilitating the replacement of working parts according to claim 1, characterized in that, The support member (120) includes a support base (121) and a connecting base (122); The connecting base (122) is fixed on the supporting base (121), the supporting base (121) is slidably inserted on the mounting base (110), and a supporting shaft (123) for supporting the rotating shaft (30) is rotatably provided inside the supporting base (121). The connecting base (122) is connected to the opening cover (200) through the linkage (130), and the inner wall of the opening cover (200) can press the connecting base (122).

3. The fixing device for facilitating the replacement of working parts according to claim 2, characterized in that, The mounting base (110) has a conical channel (111), and the support base (121) has a conical seat (124) on one side that is adapted to the conical channel (111).

4. The fixing device for facilitating the replacement of working parts according to claim 3, characterized in that, The other side of the support base (121) has an angle limiting member (125), and the mounting base (110) has an angle limiting groove (112) that is adapted to the angle limiting member (125).

5. The fixing device for facilitating the replacement of working parts according to claim 2, characterized in that, The linkage component (130) includes a linkage shaft (131) and two linkage brackets (132). Two linkage brackets (132) are arranged in a cross manner, and one end of the two linkage brackets (132) is sleeved on the linkage shaft (131), which is pivotally connected to the opening cover (200). The other end of the two linkage brackets (132) is pivotally connected to the connecting base (122). The connecting base (122) is provided with a linkage slot (126), and the extension direction of the linkage slot (126) is parallel to the axial direction of the working component (20).

6. The fixing device for facilitating the replacement of working parts according to claim 5, characterized in that, The linkage bracket (132) has a linkage pin (133) at one end away from the linkage shaft (131), and the linkage pin (133) is inserted into the linkage slot (126).

7. The fixing device for facilitating the replacement of working parts according to claim 6, characterized in that, A spring-loaded reset component (134) is sleeved on the linkage shaft (131), and the spring-loaded reset component (134) is located between the two linkage brackets (132).

8. The fixing device for facilitating the replacement of working parts according to any one of claims 1-7, characterized in that, It also includes a fixed support assembly (300), which includes a fixed support shaft (310) and support components; The fixed support shaft (310) is mounted on the support side plate (10) of the snow sweeper via a support component, and the support side plate (10) is provided with a pressure plate (11) for pressing the support component. The rotating shaft (30) is inserted into one end of the fixed support shaft (310).

9. The fixing device for facilitating the replacement of working parts according to claim 8, characterized in that, The fixed support shaft (310) is threaded to a drive wheel (320) at one end away from the rotating shaft (30).

10. A snowplow, characterized in that, Includes the fixing device for facilitating the replacement of working parts as described in any one of claims 1-9.

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