Case assembly for chain saw and chain saw

Abstract

The utility model relates to the technical field of chain saws, in particular to a machine shell assembly for a chain saw, which comprises a saw chain of the chain saw and a shell on which a guide plate for guiding the saw chain is arranged, the adjusting mechanism is constructed to adjust the position of the guide plate relative to the shell so as to adjust the tightness degree of the saw chain, and the adjusting mechanism comprises a supporting piece, a driving mechanism and a driving mechanism, the through hole is formed in the supporting piece; the adjusting piece penetrates through the through hole from the interior of the shell, extends out of the through hole and is matched with the guide plate; the adjusting piece moves in the through hole to drive the guide plate to move; and the shielding piece is arranged between the supporting piece and the shell and at least partially shields the through hole. The utility model further relates to a chain saw. According to some exemplary embodiments of the chain saw, the shielding piece is arranged between the supporting piece and the shell, so that the possibility that dust and chippings adhering to the saw chain, the guide plate or other parts enter the machine during the period that the adjusting mechanism adjusts the tightness of the saw chain is reduced, the service life of the chain saw is prolonged, and the maintenance requirement is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chain saws, in particular to a casing component for a chain saw and a corresponding chain saw. Background Art

[0002] As a versatile cutting tool, chainsaws play an important role in multiple industries. Whether in construction, decoration, landscaping or personal home use, chainsaws are widely used for their efficient cutting capabilities. Chainsaws are able to cut a variety of materials, including wood, concrete, bricks and slate. Its working principle is based on the lateral movement of the staggered blades on the saw chain to cut the material through the shearing action. However, after a long period of cutting, the saw chain will become loose due to wear and extension. In order to maintain cutting efficiency and safety, the saw chain tensioning system on the chainsaw needs to be used to adjust the tightness of the saw chain.

[0003] In the daily use of chain saws, high-intensity cutting operations generate a large amount of dust and debris. Although some dust and debris are discharged during the cutting process, a considerable amount will still accumulate inside the chain saw housing. This dust accumulation problem is particularly prominent during the maintenance and use of chain saws. Since the design of chain saws usually does not allow for thorough cleaning of internal dust without disassembling the housing, these accumulated dust can easily enter the machine through the through-holes of the saw chain tensioning system for the movement of the adjustment components.

[0004] In the prior art, there is generally a lack of solutions for the built-in tensioning system of chain saws to effectively prevent dust and debris from entering the interior of the machine, which not only affects the performance of the chain saw, but also increases maintenance costs and safety risks.

[0005] For this reason, there is still a practical demand for continuous improvement in the structure of the chain saw and its housing assembly. Utility Model Content

[0006] In view of this, an object of the present invention is to provide an improved housing assembly for a chain saw and a corresponding chain saw, so as to at least solve some of the problems in the prior art and / or overcome other possible disadvantages not mentioned herein.

[0007] According to a first aspect of the utility model, a casing assembly for a chain saw is provided, wherein the casing assembly comprises: a casing, on which a saw chain of the chain saw and a guide plate for guiding the saw chain are arranged; and an adjusting mechanism, wherein the adjusting mechanism is configured to adjust the position of the guide plate relative to the casing to adjust the tightness of the saw chain, wherein the adjusting mechanism comprises: a supporting member arranged on the casing, wherein the supporting member is configured to support the guide plate; a through hole arranged on the supporting member; an adjusting member extending from the inside of the casing through the through hole and cooperating with the guide plate, wherein the adjusting member is configured to move within the through hole to drive the guide plate to move; and a shielding member arranged between the supporting member and the casing, wherein the shielding member is configured to at least partially shield the through hole.

[0008] According to an optional embodiment of the present utility model, the shielding member is configured to be supported on the housing during adjustment of the adjustment mechanism.

[0009] According to an optional embodiment of the present utility model, the shielding member is configured to move together with the adjusting member.

[0010] According to an optional embodiment of the present utility model, the shielding member has a first end and a second end opposite to each other, and has an opening between the first end and the second end for the adjusting member to pass through.

[0011] According to an optional embodiment of the present utility model, the housing has a through portion for the adjusting member to pass through, and the moving trajectory of the adjusting member is defined by the through portion and / or the through hole.

[0012] According to an optional embodiment of the present utility model, the housing has a receiving portion for receiving the shielding member.

[0013] According to an optional embodiment of the utility model, the adjustment mechanism has a first extreme position and a second extreme position, the adjustment member is located at the first end of the through-portion in the first extreme position and is located at the second end of the through-portion in the second extreme position, wherein the shielding member shields the second end of the through-portion in the first extreme position and shields the first end of the through-portion in the second extreme position.

[0014] According to an optional embodiment of the present utility model, the adjusting member has a circle of grooves on the outer side, and the shielding member is sleeved on the grooves.

[0015] According to an optional embodiment of the utility model, the shielding member is constructed to rest its lower side on a supporting side of the shell for the shielding member to rest on, wherein the adjustment mechanism further includes at least one rib arranged on the lower side or the supporting side.

[0016] According to an optional embodiment of the present invention, the shielding member has a shape at the first end portion that at least covers the first end of the through hole.

[0017] According to an optional embodiment of the present invention, the shielding member has a shape at the second end portion that at least covers the second end of the through hole.

[0018] According to an optional embodiment of the utility model, the guide plate has a through-opening, and the adjusting member extends out from the inside of the shell through the through-portion, the opening of the shielding member, the through hole on the supporting member and the through-opening of the guide plate in sequence.

[0019] According to an optional embodiment of the present utility model, the inner diameter of the opening is smaller than the outer diameter of the adjusting member to form an interference fit.

[0020] According to an optional embodiment of the present invention, the shell has a first chip removal hole outside the through portion, and the shielding member shields the first chip removal hole in the first extreme position and releases the first chip removal hole in the second extreme position.

[0021] According to an optional embodiment of the present invention, the shell has a second chip removal hole outside the through portion, and the shielding member shields the second chip removal hole in the second extreme position and releases the second chip removal hole in the first extreme position.

[0022] According to an optional embodiment of the present utility model, the accommodating portion has the same height as the shielding member to limit the rotation of the adjusting member.

[0023] According to an optional embodiment of the present utility model, the first limit position is a relaxed position of the saw chain.

[0024] According to an optional embodiment of the present invention, the second extreme position is a tensioning position of the saw chain.

[0025] According to an optional embodiment of the present utility model, the adjustment mechanism includes two groups of ribs arranged on the lower side of the shielding member, and the two groups of ribs are symmetrical about the opening.

[0026] According to an optional embodiment of the utility model, the shielding member has a first section located between the opening and the first end and a second section located between the opening and the second end, wherein the shielding member covers the second end of the through-portion with the second section and covers the first chip removal hole with the first section in the first extreme position and / or the shielding member covers the first end of the through-portion with the first section and covers the second chip removal hole with the second section in the second extreme position.

[0027] According to an optional embodiment of the present utility model, the first section and the second section are constructed symmetrically with respect to the opening.

[0028] According to an optional embodiment of the present utility model, the adjusting mechanism further includes a gear transmission mechanism to drive the adjusting member to move in the through hole.

[0029] According to an optional embodiment of the present utility model, the adjusting member is configured as a pin.

[0030] According to an optional embodiment of the present invention, the through hole is configured to be elliptical.

[0031] According to an optional embodiment of the present utility model, the support member is fixedly connected to the shell.

[0032] According to an optional embodiment of the present utility model, the support member is constructed as a stamped iron plate.

[0033] According to an optional embodiment of the present utility model, the shielding member is configured as a shielding sheet.

[0034] According to an optional embodiment of the present utility model, the shielding member is configured to completely shield the through hole.

[0035] According to an optional embodiment of the present utility model, the shielding member is made of plastic or rubber.

[0036] According to an optional embodiment of the present utility model, there is a clearance fit between the shielding member and the supporting member.

[0037] According to an optional embodiment of the present utility model, the size of the shielding member is larger than the size of the through hole.

[0038] According to an optional embodiment of the present utility model, the housing assembly further includes a dial wheel provided on the housing, and the dial wheel is transmission-connected to the gear transmission mechanism.

[0039] According to an optional embodiment of the present utility model, the gear transmission mechanism is located inside the housing.

[0040] According to an optional embodiment of the present utility model, the gear transmission mechanism is configured to convert the rotational motion of the thumbwheel into the translational motion of the adjusting member.

[0041] According to a second aspect of the utility model, a chain saw is provided, comprising a saw chain and a guide plate for guiding the saw chain, and a housing assembly for the chain saw provided by any optional embodiment of the first aspect.

[0042] According to an optional embodiment of the present utility model, the chain saw further comprises a cover member, wherein the cover member is configured to cover the adjustment mechanism of the housing assembly and press the guide plate.

[0043] According to certain exemplary embodiments of the present invention, a shielding member is provided between the support member and the housing, thereby reducing the possibility of dust and debris adhering to the saw chain, guide bar or other components entering the interior of the machine during, for example, adjustment of the tightness of the saw chain by an adjustment mechanism, thereby extending the service life of the chain saw and reducing maintenance requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention will be described in more detail below with reference to the accompanying drawings, so that the principles, features and advantages of the present invention can be better understood. The accompanying drawings include:

[0045] Figure 1 A side view of a chain saw according to an exemplary embodiment of the present invention is shown;

[0046] Figure 2 Shows Figure 1 A partial enlarged view shown, wherein the adjustment mechanism is in the first extreme position and the shielding member is not shown;

[0047] Figure 3 Shows Figure 1 A partial enlarged view shown, wherein the adjustment mechanism is in the second extreme position and the shielding member is not shown;

[0048] Figure 4 Shows Figure 1 A partial enlarged view shown, wherein the adjustment mechanism is in the first extreme position and the support member is not shown;

[0049] Figure 5 Shows Figure 1 A partial enlarged view shown, wherein the adjustment mechanism is in the second extreme position and the support member is not shown;

[0050] Figure 6 A partial exploded view of a chain saw according to an exemplary embodiment of the present invention is shown;

[0051] Figure 7 Shows Figure 6 A perspective view of the shielding member shown;

[0052] Figure 8 shows a perspective view of the shielding member from another angle;

[0053] Fig. 9 Shown along Figure 1 A cross-sectional view along the cutting line BB shown;

[0054] Fig.10 Shows Fig. 9 A partial enlarged view of C shown; and

[0055] Fig.11 Shows Fig.10 Another embodiment shown.

[0056] Reference numerals:

[0057] 2000: chain saw; 2100: saw chain; 2200: guide plate; 2201: through hole; 2001: cover; 1000: housing assembly; 900: housing; 901: first chip removal hole; 902: second chip removal hole; 903: support side; 910: through part; 911: first end; 912: second end; 920: dial wheel; 930: accommodation part; 600: adjustment mechanism; 601: rib; 500: gear transmission mechanism; 100: support member; 200: through hole ; 201: first end; 202: second end; 300: adjusting member; 400: shielding member; 400': another possible shielding member; 410: opening; 411: first section; 412: second section; 401: first end; 402: second end; 403: lower side; 404: upper side; P1: first extreme position; P2: second extreme position; H1: height of the accommodating portion; H2: height of the shielding member; x: length direction; y: height direction; z: thickness direction. DETAILED DESCRIPTION

[0058] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention more clearly understood, the present invention will be further described in detail in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the scope of protection of the present invention, and that the various embodiments may share the same view or multiple views for description, but all features appearing in the same view cannot be interpreted as features that must be possessed by an embodiment.

[0059] First, for ease of understanding, the description in the background technology section of the present invention may be reviewed or recalled. One of the purposes of the present invention is to provide a housing assembly for a chain saw, the housing assembly comprising: a housing, a saw chain of the chain saw and a guide plate for guiding the saw chain are arranged on the housing; and an adjustment mechanism, the adjustment mechanism is configured to adjust the position of the guide plate relative to the housing to adjust the tightness of the saw chain, wherein the adjustment mechanism comprises: a support member arranged on the housing, the support member is configured to support the guide plate; a through hole arranged on the support member; an adjustment member extending from the inside of the housing through the through hole and cooperating with the guide plate, the adjustment member is configured to move in the through hole to drive the guide plate to move; and a shielding member arranged between the support member and the housing, the shielding member is configured to at least partially (preferably completely) shield the through hole. Thus, by providing a shield between the support and the housing, the possibility of dust and debris adhering to the saw chain, guide bar or other components entering the interior of the machine, for example during the adjustment mechanism adjusting the tightness of the saw chain, is reduced, thereby extending the service life of the chain saw and reducing maintenance requirements.

[0060] Exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.

[0061] Figure 1 FIG. 2 shows a side view of a chain saw 2000 according to an exemplary embodiment of the present invention. Figure 1 An xyz coordinate system is exemplarily shown in the following figures, wherein x represents the length direction of the chain saw 2000 , y represents the height direction of the chain saw 2000 , and z represents the thickness direction of the chain saw 2000 .

[0062] like Figure 1 As shown, the chain saw 2000 includes a housing assembly 1000 according to an exemplary embodiment of the present invention, a saw chain 2100 (in Figure 1 ) and a guide bar 2200 (shown schematically in dashed lines in FIG. Figure 1 The housing assembly 1000 includes a housing 900, and the saw chain 2100 and the guide plate 2200 of the chain saw 2000 are arranged on the housing 900 as shown in the figure. Here, the housing 900 can be, for example, Figure 1 The structure shown is the left half of the housing of the chain saw 2000. Figure 1It can be seen that the housing assembly 1000 also includes an adjustment mechanism 600. In combination with the background art, this adjustment mechanism 600 is also called a saw chain tensioning system, which is used to adjust the position of the guide plate 2200 relative to the housing 900 to adjust the tightness of the saw chain 2100. Here, the adjustment mechanism 600 includes a support member 100 provided on the housing 900 for supporting the guide plate 2200, a through hole 200 provided on the support member 100, and an adjustment member 300 extending from the inside of the housing 900 through the through hole 200 and cooperating with the guide plate 2200. Here, the support member 100 can be configured as, for example, a stamped iron plate fixedly connected to the housing 900, so as to better support the guide plate 2200, which is usually also made of iron. The working method of the adjustment mechanism 600 is, for example, by adjusting the adjustment member 300 in the through hole 200, for example, Figure 1 The guide plate 2200 moves horizontally along the x-axis to adjust the tightness of the saw chain 2100. Figure 1 As can be seen from the exemplary directions, the adjusting member 300 drives the guide plate 2200 to move leftward along the x-axis, which will further tighten the saw chain 2100, while the adjusting member 300 drives the guide plate 2200 to move rightward along the x-axis, which will further loosen the saw chain 2100. As can be seen from the subsequent figures, the adjusting mechanism 600 may include a gear transmission mechanism 500 for driving the movement of the adjusting member 300. Figure 1 It can also be seen that the housing assembly 1000 may further include a dial wheel 920 in transmission connection with the gear transmission mechanism 500. When the user of the chain saw 2000 manually dials the dial wheel 920 provided on the housing 900, for example, the gear transmission mechanism 500 located inside the housing 900 may convert the rotational motion of the dial wheel 920 into the translational motion of the adjustment member 300 to adjust the tightness of the saw chain 2100. As described in the background art, in order to reduce the possibility of dust and debris entering the interior of the housing 900 at least during the period when the adjustment mechanism 600 adjusts the tightness of the saw chain 2100, the adjustment mechanism 600 further includes a shielding member 400 provided between the support member 100 and the housing 900, and the shielding member 400 at least partially shields the through hole 200 during the period when the adjustment mechanism 600 adjusts the tightness of the saw chain 2100 to prevent dust and debris from entering the interior of the machine, thereby extending the service life of the chain saw 2000.

[0063] Figure 2 Shows Figure 1 A partial enlarged view shown, wherein the adjustment mechanism 600 is in the first extreme position P1, and the shielding member 400 is not shown; Figure 3 Shows Figure 1 A partial enlarged view shown, wherein the adjustment mechanism 600 is in the second extreme position P2, and the shielding member 400 is not shown; Figure 4 Shows Figure 1A partial enlarged view shown, wherein the adjustment mechanism 600 is in the first extreme position P1, and the support member 100 is not shown; Figure 5 Shows Figure 1 A is a partial enlarged view shown in FIG. 1 , in which the adjustment mechanism 600 is in the second extreme position P2 and the support member 100 is not shown. Figure 1 The first extreme position P1 is a relaxed position of the saw chain 2100 , and the second extreme position P2 is a tensioned position of the saw chain 2100 . The adjusting member 300 of the adjusting mechanism 600 can move between these two positions to adjust the tightness of the saw chain 2100 .

[0064] like Figure 2 and Figure 3 As shown, in the absence of the shielding member 400, the gear transmission mechanism 500 located inside the housing 900 can be clearly seen through the through hole 200, which is configured as an ellipse, for example. Figure 2 and Figure 3 The housing 900 that should be blocked by the support member 100 is still shown, and the housing 900 also shows a receiving portion 930, which is used to receive the shielding member 400 not shown here. Here, the receiving space specially provided for the shielding member 400 also reduces unnecessary influence on other components.

[0065] Compare to Figure 4 and Figure 5 The shielding member 400 has a shape matching the receiving portion 930, in particular, in combination with the shape described later. Figure 6 , the receiving portion 930 has the same height as the shielding member 400 to limit the rotation of the adjusting member 300. In other words, the shielding member 400 is received in the receiving portion 930 in a shape-matched manner and is only allowed to perform linear translational movement. More specifically, the shielding member 400 is only allowed to move between the first extreme position P1 and the second extreme position P2 together with the adjusting member 300.

[0066] Combined with the following description Fig.10 and Fig.11 It can be seen that the housing 900 has a through portion 910 (at Figure 2 and Figure 3 It is not marked in the figure, but it should be understood that it partially overlaps with the through hole 200; Figure 4 and Figure 5 The moving track of the adjusting member 300 can be limited by the through-portion 910 alone, that is, the adjusting member 300 is located at the first end 911 of the through-portion 910 in the first extreme position P1 and at the second end 912 of the through-portion 910 in the second extreme position P2. Figure 2 and Figure 3As shown, the movement trajectory of the adjusting member 300 can also be defined by the through hole 200 alone, for example, the adjusting member 300 is located at the first end 201 of the through hole 200 in the first extreme position P1 and is located at the second end 202 of the through hole 200 in the second extreme position P2. Similarly, the movement trajectory of the adjusting member 300 can also be defined by the through portion 910 and the through hole 200 together, for example, the first end 201 and the second end 202 of the through hole 200 are located at the second extreme position P2. Figure 2 and Figure 3 The movement path of the adjusting element 300 is delimited in the x-direction, while the passage 910 (not shown here) delimits the movement path of the adjusting element 300 in the y-direction.

[0067] from Figure 3 and Figure 5 It can be seen that the housing 900 has a first chip removal hole 901 outside the through portion 910 (and is not in the through hole 200 at the same time). Figure 2 and Figure 4 , the shielding member 400 shields the first chip removal hole 901 in the first extreme position P1 and releases the first chip removal hole 901 in the second extreme position P2 (that is, the first chip removal hole 901 is not shielded). Figure 2 and Figure 4 It can be seen that the housing 900 has a second chip removal hole 902 outside the through portion 910 (and is also not in the through hole 200). Figure 3 and Figure 5 , the shielding member 400 shields the second chip removal hole 902 in the second extreme position P2 and releases the second chip removal hole 902 in the first extreme position P1 (that is, the second chip removal hole 902 is not shielded).

[0068] Figure 2 and Figure 3 Another possible shielding member 400' is schematically shown in dashed lines, that is, the shielding member 400 and the receiving portion 930 matched therewith can be constructed in other configurations, as long as they can cover the through hole 200 during the movement with the adjusting member 300. This ensures that dust and debris are effectively blocked from entering the interior of the housing 900 during the entire adjustment process. Here, the size of the through hole 200 should be smaller than the size of the shielding member 400 to prevent the shielding member 400 from falling out of the through hole 200.

[0069] Figure 6 A partial exploded view of a chain saw 2000 according to an exemplary embodiment of the present invention is shown; Figure 7 Shows Figure 6 A perspective view of the shielding member 400 is shown; Figure 8 A perspective view of the shielding member 400 viewed from another angle is shown.

[0070] like Figure 6and Figure 7 As shown, the shielding member 400 is, for example, constructed as a shielding sheet having a relatively small thickness and preferably made of plastic or rubber. Figure 6 Combination Figure 7 As shown, the height H1 of the accommodating portion 930 is exactly equal to the height H2 of the shielding member 400 , so that the shielding member 400 can only translate in the accommodating portion 930 but cannot rotate.

[0071] from Figure 7 It can be seen that the shielding member 400 has a first end 401 and a second end 402 that are opposite to each other, and has an opening 410 between the first end 401 and the second end 402 for the adjusting member 300 to pass through. Here, when the shielding member 400 is made of rubber, for example, the inner diameter of the opening 410 is preferably slightly smaller than the outer diameter of the adjusting member 300 to form an interference fit, thereby further ensuring a sealing effect during the adjustment process. Figure 7 It can also be seen that the shielding member 400 further comprises a first section 411 located between the opening 410 and the first end 401 and a second section 412 located between the opening 410 and the second end 402. Figure 7 As shown, the first section 411 and the second section 412 are symmetrically configured with respect to the opening 410. Figure 2 and Figure 4 , the shielding member 400 shields the second end 912 of the through portion 910 with the second section 412 (and also shields the second end 202 of the through hole 200) in the first extreme position P1 and shields the first chip removal hole 901 with the first section 411, so that Figure 2 and Figure 4 Only the second chip hole 902 is exposed. Similarly, Figure 3 and Figure 5 In the second extreme position P2, the shielding member 400 shields the first end 911 of the through portion 910 with the first section 411 (and also shields the first end 201 of the through hole 200) and shields the second chip removal hole 902 with the second section 412. Figure 3 and Figure 5 Only the first chip row hole 901 is revealed.

[0072] from Figure 7 Combination Figure 2 , Figure 3 , Figure 6 It can be seen that the shielding member 400 has a shape (e.g., semicircular) at the first end 401 that at least covers the first end 201 of the through hole 200, and the shielding member 400 also has a shape (e.g., semicircular) at the second end 402 that at least covers the second end 202 of the through hole 200. In this way, the through hole 200 can be shielded with a minimum area size.

[0073] like Figures 6 to 8 Combined with the following description Fig.10 and Fig.11 As shown, the shielding member 400 has an upper side 404 and a lower side 403, wherein the upper side 404 faces the support member 100 and the lower side 403 faces the support side 903 of the housing 900 on which the shielding member 400 rests. In order to reduce the friction between the lower side 403 of the shielding member 400 and the support side 903 of the housing 900 during adjustment of the adjustment mechanism 600, the adjustment mechanism 600 may further include at least one rib 601 disposed on the lower side 403 or the support side 903. Figure 8 4 shows four ribs 601 disposed on the lower side 403 of the shielding member 400, and these four ribs 601 constitute two groups of ribs 601 located on the first section 411 and the second section 412, and these two groups of ribs 601 are symmetrical about the opening 410. This symmetrical design particularly improves the stability of the shielding member 400. It should be understood that a similar arrangement or another number of ribs 601 can be adopted when the ribs 601 are disposed on the supporting side 903 of the shell 900. The design using ribs can particularly transform the original surface contact between the lower side 403 of the shielding member 400 and the supporting side 903 of the shell 900 into a line contact, which also indirectly makes the movement of the adjustment member 300 smoother.

[0074] Fig. 9 Shown along Figure 1 A cross-sectional view along the cutting line BB shown; Fig.10 Shows Fig. 9 The enlarged view of the C part is shown; Fig.11 Shows Fig.10 Another embodiment shown.

[0075] from Fig. 9 Combination Figure 1 and Figure 6 It can be seen that the chain saw 2000 may further include a cover 2001, which is configured to cover the adjustment mechanism 600 of the housing assembly 1000 (such as the support member 100, the through hole 200, the adjustment member 300, and the shielding member 400 mentioned above), and to press the guide plate 2200 to prevent misoperation after the adjustment mechanism 600 completes the adjustment. Figure 1 was removed to allow for easier viewing of the other components.

[0076] like Fig.10 and Fig.11 Combination Fig. 9 As shown, the shielding member 400 is supported on the housing 900 during the adjustment of the adjustment mechanism 600, that is, as described above, the shielding member 400 is supported on the supporting side 903 of the housing 900 at the lower side 403. When the tightness of the saw chain 2100 of the chain saw 2000 needs to be adjusted, the user of the chain saw 2000 usually moves the chain saw 2000 to the lower side 403. Fig. 9 As shown, the chain saw 2000 is laid flat for adjustment with the z direction as the gravity direction, and at this time, there is a clearance fit between the shielding member 400 and the supporting member 100 .

[0077] from Fig.10 and Fig.11 It can be seen that the guide plate 2200 has a through-hole 2201 that matches the shape of the adjusting member 300. For example, the adjusting member 300 constructed as a pin extends from the inside of the shell 900 (that is, from bottom to top along the thickness direction z of the chain saw 2000 in the figure) through the through-portion 910 of the shell 900, the opening 410 of the shielding member 400, the through hole 200 on the support member 100 and the through-hole 2201 of the guide plate 2200.

[0078] exist Fig.11 For the sake of clarity, the cross-section line of the shielding member 400 is not shown. Fig.11 It can be seen from another embodiment shown that the adjusting member 300 may have a circle of grooves on the outer side, and the shielding member 400 is mounted on the circle of grooves with an opening 410, which further improves the dustproof effect. Fig.11 The figure also schematically shows an exemplary path for dust and debris to be discharged through the second chip removal hole 902 with dotted arrows. Since there is a gap (for example, 0.2 mm) between the shielding member 400 and the support member 100, dust and debris may still enter from this gap into the spaces on the left and right sides of the shielding member 400 as shown in the figure (i.e., the location of the accommodating portion 930 of the housing 900). However, as the chain saw 2000 is used for a longer time, the gradually accumulated dust and debris will block the movement path of the shielding member 400. At the same time, since the shielding member 400 is tightly connected to the adjusting member 300, it will also hinder the movement of the adjusting member 300 and thus hinder the adjustment of the saw chain 2100. Based on this, by providing the first chip removal hole 901 and the second chip removal hole 902 on the left and right sides of the shielding member 400 as shown in the figure, these accumulated dust and debris can be removed during the pushing process of the shielding member 400 and under the action of gravity. Fig.11 The chips can be discharged as shown by the dotted arrow, or can be discharged smoothly through the first chip discharge hole 901 or the second chip discharge hole 902 from the accommodating portion 930 of the housing 900 for accommodating the shielding member 400 when the placement state of the chain saw 2000 is changed (for example, when the user shakes the chain saw 2000), thereby reducing internal accumulation and ensuring smoothness for the user, especially when adjusting the tightness of the saw chain 2100 of the chain saw 2000.

[0079] Other advantages and alternative embodiments of the present invention are obvious to those skilled in the art. Therefore, the present invention is not limited to the specific details, representative structures and exemplary embodiments shown and described in its broader sense. Various modifications and substitutions can be made by those skilled in the art without departing from the basic spirit and scope of the present invention.

Claims

1. A housing assembly for a chain saw, characterized in that: The housing assembly (1000) comprises: a housing (900), on which a saw chain (2100) of the chain saw (2000) and a guide plate (2200) for guiding the saw chain (2100) are arranged; and An adjustment mechanism (600) is configured to adjust the position of the guide plate (2200) relative to the housing (900) to adjust the tightness of the saw chain (2100), wherein the adjustment mechanism (600) comprises: a support member (100) disposed on the housing (900), the support member (100) being configured to support the guide plate (2200); A through hole (200) provided on the support member (100); An adjusting member (300) extending from the inside of the housing (900) through the through hole (200) and cooperating with the guide plate (2200), wherein the adjusting member (300) is configured to move within the through hole (200) to drive the guide plate (2200) to move; and A shielding member (400) is provided between the support member (100) and the housing (900), and the shielding member (400) is configured to at least partially shield the through hole (200).

2. The housing assembly for a chain saw according to claim 1, characterized in that: The shielding member (400) is configured to be supported on the housing (900) during adjustment of the adjustment mechanism (600); and / or The shielding member (400) is configured to move together with the adjusting member (300); and / or The shielding member (400) has a first end (401) and a second end (402) that are opposite to each other, and has an opening (410) between the first end (401) and the second end (402) for the adjusting member (300) to pass through; and / or The housing (900) has a through-portion (910) for the adjusting member (300) to pass through, and the moving track of the adjusting member (300) is defined by the through-portion (910) and / or the through hole (200); and / or The housing (900) has a receiving portion (930) for receiving the shielding member (400).

3. The housing assembly for a chain saw according to claim 2, characterized in that: The adjusting mechanism (600) has a first extreme position (P1) and a second extreme position (P2), the adjusting member (300) is located at the first end (911) of the through-portion (910) in the first extreme position (P1) and is located at the second end (912) of the through-portion (910) in the second extreme position (P2), wherein the shielding member (400) shields the second end (912) of the through-portion (910) in the first extreme position (P1) and shields the first end (911) of the through-portion (910) in the second extreme position (P2); and / or The adjusting member (300) has a circle of grooves on the outer side, and the shielding member (400) is sleeved on the grooves; and / or The shielding member (400) is constructed so that its lower side (403) is placed against a supporting side (903) of the housing (900) on which the shielding member (400) is placed, wherein the adjustment mechanism (600) further comprises at least one rib (601) provided on the lower side (403) or the supporting side (903); and / or The shielding member (400) has a shape at the first end (401) that at least covers the first end (201) of the through hole (200); and / or The shielding member (400) has a shape at the second end (402) that at least covers the second end (202) of the through hole (200); and / or The guide plate (2200) has a through-hole (2201), and the adjusting member (300) extends out from the inside of the housing (900) through the through-hole (910), the opening (410) of the shielding member (400), the through-hole (200) on the supporting member (100), and the through-hole (2201) of the guide plate (2200) in sequence; and / or The inner diameter of the opening (410) is smaller than the outer diameter of the adjusting member (300) to form an interference fit; and / or The housing (900) has a first chip removal hole (901) outside the through-hole (910), and the shielding member (400) shields the first chip removal hole (901) in the first extreme position (P1) and releases the first chip removal hole (901) in the second extreme position (P2); and / or The housing (900) has a second chip removal hole (902) outside the through-hole (910), and the shielding member (400) shields the second chip removal hole (902) in the second extreme position (P2) and releases the second chip removal hole (902) in the first extreme position (P1); and / or The accommodating portion (930) has the same height as the shielding member (400) to limit the rotation of the adjusting member (300).

4. The housing assembly for a chain saw according to claim 3, characterized in that: The first extreme position (P1) is a relaxed position of the saw chain (2100); and / or The second extreme position (P2) is a tensioning position of the saw chain (2100); and / or The adjustment mechanism (600) comprises two groups of ribs (601) arranged on the lower side (403) of the shielding member (400), and the two groups of ribs (601) are symmetrical with respect to the opening (410); and / or The shielding member (400) comprises a first section (411) located between the opening (410) and the first end (401) and a second section (412) located between the opening (410) and the second end (402), wherein the shielding member (400) in the first extreme position (P1) shields the second end (912) of the through-portion (910) with the second section (412) and shields the first chip removal hole (901) with the first section (411) and / or the shielding member (400) in the second extreme position (P2) shields the first end (911) of the through-portion (910) with the first section (411) and shields the second chip removal hole (902) with the second section (412).

5. The housing assembly for a chain saw according to claim 4, characterized in that: The first section (411) and the second section (412) are configured symmetrically with respect to the opening (410).

6. The housing assembly for a chain saw according to any one of claims 1 to 5, characterized in that: The adjusting mechanism (600) further comprises a gear transmission mechanism (500) to drive the adjusting member (300) to move in the through hole (200); and / or The adjusting member (300) is configured as a pin; and / or The through hole (200) is configured to be elliptical; and / or The support member (100) is fixedly connected to the housing (900); and / or The support member (100) is constructed as a stamped iron plate; and / or The shielding member (400) is configured as a shielding sheet; and / or The shielding member (400) is configured to completely shield the through hole (200); and / or The shielding member (400) is made of plastic or rubber; and / or There is a clearance fit between the shielding member (400) and the supporting member (100); and / or The size of the shielding member (400) is greater than the size of the through hole (200).

7. The housing assembly for a chain saw according to claim 6, characterized in that: The housing assembly (1000) further comprises a thumbwheel (920) disposed on the housing (900), the thumbwheel (920) being transmission-connected to the gear transmission mechanism (500); and / or The gear transmission mechanism (500) is located inside the housing (900).

8. The housing assembly for a chain saw according to claim 7, characterized in that: The gear transmission mechanism (500) is configured to convert the rotational motion of the thumbwheel (920) into the translational motion of the adjusting member (300).

9. A chain saw, characterized in that: The chain saw (2000) comprises a saw chain (2100) and a guide bar (2200) for guiding the saw chain (2100), and a housing assembly for a chain saw according to any one of claims 1 to 8.

10. The chain saw according to claim 9, characterized in that The chain saw (2000) further comprises a cover (2001), wherein the cover (2001) is configured to cover the adjustment mechanism (600) of the housing assembly (1000) and to press the guide plate (2200).

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