Wire tightener

Abstract

The utility model provides a tightener which can easily adjust the tension of a traction member to target tension. The tightener includes a first member attachable to a first attachment object, a second member attachable to a second attachment object, a pulling member that pulls the first member toward the second member, and a pulling device that pulls the pulling member. The traction device includes a rotating body that applies a traction force to the traction member, a brake gear that stops rotation of the rotating body, a first stopper member, and a second stopper member. The first stopper member has a first claw group capable of simultaneously engaging with at least two teeth of the brake gear. The second stopper member has a second claw group capable of simultaneously engaging with at least two teeth of the brake gear.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wire tightener. BACKGROUND

[0002] Known is a wire tightener that pulls and sets an overhead wire or the like.

[0003] As related art, a wire tightener is disclosed in Patent Literature 1. The wire tightener described in Patent Literature 1 includes a wire tightener body portion, a first mounting portion, a traction portion that links between the wire tightener body portion and the first mounting portion, a rotation drive mechanism that winds the traction portion inside the wire tightener body portion, a drive source that has a motor that applies a driving force to the rotation drive mechanism, a brake mechanism that is locked to the rotation drive mechanism, and a second mounting portion that is provided to the wire tightener body portion. The brake mechanism has a ratchet type brake, a pawl that can be locked to the ratchet type brake, and a ratchet pawl that can be locked to the ratchet type brake.

[0004] PRIOR ART DOCUMENTS

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. 2013-255398 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] An object of the utility model is to provide a wire tightener that can easily adjust the tension of a traction member to a target tension.

[0008] MEANS FOR SOLVING THE PROBLEMS

[0009] The utility model relates to the wire tightener shown below.

[0010] (1) A wire tightener includes:

[0011] a first member that can be mounted to a first mounting object;

[0012] a second member that can be mounted to a second mounting object;

[0013] a traction member that pulls the first member toward the second member; and

[0014] a traction device that pulls the traction member;

[0015] The traction device includes:

[0016] a rotation body that applies a traction force to the traction member;

[0017] a brake gear that has a plurality of teeth, is rotatable about a first axis, and stops rotation of the rotation body;

[0018] a first stop member swingable about a second axis parallel to the first axis, allowing the brake gear to rotate in a first rotational direction and preventing the brake gear from rotating in a second rotational direction opposite to the first rotational direction; and

[0019] a second stop member swingable about a third axis parallel to the second axis, allowing the brake gear to rotate in the first rotational direction and preventing the brake gear from rotating in the second rotational direction,

[0020] the first stop member has a first claw group capable of engaging at least two teeth of the brake gear at the same time,

[0021] the second stop member has a second claw group capable of engaging at least two teeth of the brake gear at the same time.

[0022] (2) The line tightener according to the above (1), wherein the first claw group is capable of engaging at least three teeth of the brake gear at the same time,

[0023] the second claw group is capable of engaging at least three teeth of the brake gear at the same time.

[0024] (3) The line tightener according to the above (1), wherein the first claw group includes:

[0025] a first claw; and

[0026] a second claw disposed on an upstream side of the first claw in the first rotational direction,

[0027] a distance between the second axis and a front end of the first claw is greater than a distance between the second axis and a front end of the second claw.

[0028] (4) The line tightener according to the above (1), wherein the first claw group includes:

[0029] a first claw; and

[0030] a second claw disposed on an upstream side of the first claw in the first rotational direction,

[0031] an angle formed between a first straight line connecting the second axis and a front end of the first claw and a second straight line connecting the front end of the first claw and a front end of the second claw, as viewed in a direction parallel to the second axis, is 45 degrees or less.

[0032] (5) The line tightener according to the above (1), wherein the first claw group includes:

[0033] a first claw; and

[0034] a second pawl configured on an upstream side of the first pawl in the first rotation direction,

[0035] a ratio of a force around the second axis that the first pawl receives from the brake gear to a force in a direction toward the second axis that the first pawl receives from the brake gear when the brake gear rotates in the second rotation direction is defined as a first ratio, and a ratio of a force around the second axis that the second pawl receives from the brake gear to a force in a direction toward the second axis that the second pawl receives from the brake gear when the brake gear rotates in the second rotation direction is defined as a second ratio, the second ratio being larger than the first ratio.

[0036] (6) The line tightener according to (1) above, wherein when the plurality of pawls that constitute the first pawl group are in a state of engaging with the brake gear, the plurality of pawls that constitute the second pawl group are each configured to maintain a state of not engaging with the brake gear at all times,

[0037] when the plurality of pawls that constitute the second pawl group are in a state of engaging with the brake gear, the plurality of pawls that constitute the first pawl group are each configured to maintain a state of not engaging with the brake gear at all times.

[0038] (7) The line tightener according to (6) above, wherein the brake gear rotates in the first rotation direction around the first axis, and every time the brake gear rotates by an angle corresponding to half a tooth of the teeth of the brake gear, the first pawl group and the second pawl group are configured to alternately engage with the plurality of teeth of the brake gear.

[0039] (8) The line tightener according to any one of (1) to (7) above, further comprising:

[0040] an operation handle that is swingable around the first axis;

[0041] a ratchet gear that transmits an operation force applied to the operation handle to the brake gear and is rotatable around the first axis; and

[0042] a mode switching device that specifies a direction in which the ratchet gear is rotatable,

[0043] the mode switching device has:

[0044] a switching operation member that is swingable around a fourth axis parallel to the first axis between a first position and a second position;

[0045] a first engagement portion that is provided to the switching operation member and engages with the ratchet gear when the switching operation member is in the first position; and

[0046] a second engagement portion configured to the switching operation member, and engaged with the ratchet gear when the switching operation member is in the second position,

[0047] the first engagement portion includes a first set of teeth, and the first set of teeth is engaged with a plurality of teeth of the ratchet gear simultaneously when the switching operation member is in the first position,

[0048] the second engagement portion includes a second set of teeth, and the second set of teeth is engaged with a plurality of teeth of the ratchet gear simultaneously when the switching operation member is in the second position.

[0049] (9) The line tightener according to (8) above, wherein the number of teeth of the ratchet gear is more than the number of teeth of the brake gear.

[0050] Effect of Invention

[0051] By the present application, a line tightener can easily adjust the tension of a traction member to a target tension. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 is a schematic diagram showing a side view of the line tightener in the first embodiment.

[0053] Figure 2 is Figure 1 is an enlarged view of the area indicated by the circle A of the one point chain line in FIG. 8.

[0054] Figure 3 is a schematic diagram showing a cross-sectional view of a part of the line tightener in the first embodiment.

[0055] Figure 4 is a diagram schematically showing the positional relationship between the first stop member, the second stop member, and the brake gear.

[0056] Figure 5 is a diagram schematically showing the positional relationship between the first stop member, the second stop member, and the brake gear.

[0057] Figure 6 is a diagram schematically showing the positional relationship between the first stop member, the second stop member, and the brake gear.

[0058] Figure 7 is a diagram schematically showing the positional relationship between the first stop member, the second stop member, and the brake gear.

[0059] Figure 8 is a diagram schematically showing the positional relationship between the first stop member, the second stop member, and the brake gear.

[0060] Figure 9is a schematic cross-sectional view showing a part of the line tightener in the first embodiment.

[0061] Figure 10 is a schematic cross-sectional view showing a part of the line tightener in the first embodiment.

[0062] Figure 11 is a schematic cross-sectional view showing a part of the line tightener in the first embodiment.

[0063] Figure 12 is a schematic cross-sectional view showing a configuration relationship between the switching operation member and the ratchet gear.

[0064] Figure 13 is a schematic cross-sectional view showing a configuration relationship between the switching operation member and the ratchet gear.

[0065] Figure 14 is a partially cutaway bottom view schematically showing an example of the transmission mechanism.

[0066] Figure 15 is a schematic side view showing the line tightener in the second embodiment.

[0067] Figure 16 is a view schematically showing a case where the line tightener in the use embodiment performs a wire or the like wire material drawing work. DETAILED DESCRIPTION

[0068] Hereinafter, the line tightener 1 in the embodiment will be described in detail with reference to the drawings. In this specification, the same or similar symbols will be attached to components having the same function. Also, in some cases, the repeated description will be omitted for the components to which the same or similar symbols have been attached.

[0069] (First Embodiment)

[0070] Reference Figures 1 to 14 and Figure 16 will be described with respect to the line tightener 1A in the first embodiment. Figure 1 is a schematic side view showing the line tightener 1A in the first embodiment. Figure 2 is Figure 1 is an enlarged view of the area indicated by the circle A of the one-point chain line in FIG. 8. Figure 3 is a schematic cross-sectional view showing a part of the line tightener 1A in the first embodiment. Figures 4 to 8 is a view schematically showing a configuration relationship between the first stopper member 7 and the second stopper member 8 and the ratchet gear 43. Figures 9 to 11 is a schematic cross-sectional view showing a part of the line tightener 1A in the first embodiment. Figure 12 and Figure 13It is a schematic cross-sectional view schematically showing the arrangement relationship between the switching operation member 60 and the ratchet gear 53 . Figure 14 It is a partially cutaway bottom view schematically showing an example of the transmission mechanism M. Figure 16 This is a diagram schematically showing a state in which a wire tensioning operation such as an electric wire is performed using the wire tensioner 1 according to the embodiment.

[0071] The tensioner 1A in the first embodiment is used, for example, to pull an electric wire such as an overhead wire. The tensioner 1A includes a first member 2 , a second member 3 , a pulling member 10 , and a pulling device 4 .

[0072] The first component 2 is a component that can be mounted on a first mounting object. The first component 2 includes an optional mounting portion 21 that can be mounted on the first mounting object. Figure 1 In the described example, the attachment portion 21 includes a first hook portion 21 f that can be attached to a first attachment object.

[0073] The first mounting object is, for example, a wire clamp G1 that can hold an electric wire such as an overhead wire (see Figure 16 In this case, the first component 2 is pulled toward the second component 3, thereby applying tension to the wire E gripped by the wire gripper G1. In addition, the first mounting object can be appropriately selected according to the type of wire to be tensioned or the content of the operation to be tensioned.

[0074] exist Figure 1 In the example described, the first member 2 includes a pulley 25 that guides the movement of the traction member 10 (more specifically, the chain 10a). In this case, since the traction member 10 is provided in a double manner between the first member 2 and the traction device 4, a greater tension can be applied to the wire (e.g., an overhead wire).

[0075] The second component 3 is a component that can be mounted on a second mounting object. The second component 3 includes an arbitrary second mounting portion 31 that can be mounted on the second mounting object. Figure 1 In the described example, the second attachment portion 31 includes a second hook portion 31 f that can be attached to the second attachment object.

[0076] The second mounting object is, for example, a flexible member G2 mounted on a utility pole or the like (see Figure 16 The second mounting object is preferably a component mounted on a fixed structure (eg, a utility pole). However, the second mounting object is not limited to a component mounted on a fixed structure, but may be any component.

[0077] The pulling member 10 is a linear member or a belt-shaped member that pulls the first member 2 toward the second member 3. The pulling member 10 has flexibility.Figure 1 In the example described, the pulling member 10 is a chain 10a. The chain 10a is composed of a plurality of ring-shaped members K. The pulling member 10 has a first end 11 and a second end 12. Figure 1 In the example described, the first end portion 11 is connected to the traction device 4 (more specifically, the latch member 41 supported by the frame 40 of the traction device 4). Furthermore, an end stop 13 is disposed on the second end portion 12. The end stop 13 prevents the traction member 10 from being separated from the traction device 4. More specifically, when the second end portion 12 of the traction member 10 returns to the traction device 4, the end stop 13 defines the return limit position of the second end portion 12.

[0078] exist Figure 1 In the example described, the traction member 10 (more specifically, the chain 10a) is folded back by the pulley 25 and extends toward the traction device 4. The traction member 10 is also folded back by the rotating body 45 described later and extends from the traction device 4 to the second end 12 of the traction member 10.

[0079] The traction device 4 pulls the traction member 10 (more specifically, the chain 10a). Figure 2 In the described example, the traction device 4 includes a rotating body 45 , a brake gear 43 , a first stopper member 7 , and a second stopper member 8 .

[0080] The traction member 10 is hung on a rotating body 45, and the rotating body 45 applies a traction force to the traction member 10. The rotating body 45 is, for example, a load pulley.

[0081] The brake gear 43 can rotate around the first axis AX1. By stopping the rotation of the brake gear 43, the brake gear 43 can stop the rotation of the rotating body 45. Figure 2 As illustrated, the brake gear 43 has a plurality of teeth 44 .

[0082] The first stop member 7 is rotatable about a second axis AX2 parallel to the first axis AX1. The first stop member 7 allows the brake gear 43 to rotate about the first axis AX1 in a first rotational direction R1 while preventing the brake gear 43 from rotating about the first axis AX1 in a second rotational direction R2 opposite to the first rotational direction R1. Preventing the brake gear 43 from rotating in the second rotational direction R2 maintains the tension of the traction member 10.

[0083] The second stop member 8 can swing around a third axis AX3 parallel to the second axis AX2. Figure 2 In the described example, the third axis AX3 and the rotation axis AX of the rotating body 45 are coaxial.

[0084] The second stop member 8 allows the brake gear 43 to rotate in the first rotational direction Rl about the first axis AXl and prevents the brake gear 43 from rotating in the second rotational direction R2 opposite to the first rotational direction Rl about the first axis AXl. The rotation of the brake gear 43 in the second rotational direction R2 is thus prevented, whereby the tension of the traction member 10 is maintained.

[0085] In Figure 3 In the example described, the first stop member 7 has a first claw set 75 including a first claw 75a and a second claw 75b. The first claw set 75 can also include a third claw 75c. The first claw set 75 can engage at least two teeth 44 of the brake gear 43 (or at least three teeth 44 of the brake gear 43) simultaneously. In Figure 3 In the example described, the first claw 75a engages one tooth of the brake gear 43, the second claw 75b engages another tooth of the brake gear 43, and the third claw 75c engages yet another tooth of the brake gear 43.

[0086] In Figure 3 In the example described, the second stop member 8 has a second claw set 85 including a fourth claw 85a and a fifth claw 85b. The second claw set 85 can also include a sixth claw 85c. The second claw set 85 can engage at least two teeth 44 of the brake gear 43 (or at least three teeth 44 of the brake gear 43) simultaneously.

[0087] In Figure 2 In the example described, the brake gear 43 has a plurality of teeth 44. Therefore, the rotational angle of the brake gear 43 about the first axis AXl required for the claw of the first stop member 7 (or the claw of the second stop member 8) to pass over one tooth becomes smaller. Thus, the tension of the traction member 10 can be easily adjusted to the target tension. For example, assume that the target tension that the tightener 1A is supposed to apply is 30 kN, and that the current tension applied to the traction member 10 by the tightener 1A is slightly lower than 30 kN. In this case, the operating handle 51 is operated to cause the claw of the first stop member 7 (or the claw of the second stop member 8) to pass over one tooth of the brake gear 43, whereby the tension applied to the traction member 10 by the tightener 1A easily reaches 30 kN. Further, since the rotational angle of the brake gear 43 is small, it is possible to prevent the tension from greatly exceeding 30 kN.

[0088] On the other hand, when the number of the teeth 44 of the brake gear 43 is large, the size of each tooth 44 becomes small, and the contact area between the brake gear 43 and the stopper member (7, 8) becomes small. Thus, the load per unit area acting on the pawl of the stopper member (7, 8) becomes large, and it becomes difficult to maintain the engaged relationship between the brake gear 43 and the stopper member (7, 8).

[0089] As the tension of the traction member 10 increases toward the target tension, the load that the worker should apply to the operation handle 51 becomes large. When the number of the teeth 44 of the brake gear 43 is large, since the excess amount of the tension from the target tension becomes small, the burden on the worker in the final stage in which the tension of the traction member 10 reaches the target tension becomes small. Further, since the excess amount of the tension from the target tension becomes small, excessive load does not act on the tightener 1A.

[0090] On the other hand, when the number of the teeth 44 of the brake gear 43 is large, the size of each tooth 44 becomes small, and the contact area between the brake gear 43 and the stopper member (7, 8) becomes small. Thus, the load per unit area acting on the pawl of the stopper member (7, 8) becomes large, and it becomes difficult to maintain the engaged relationship between the brake gear 43 and the stopper member (7, 8).

[0091] On the other hand, when the number of the teeth 44 of the brake gear 43 is large, the size of each tooth 44 becomes small, and the contact area between the brake gear 43 and the stopper member (7, 8) becomes small. Thus, the load per unit area acting on the pawl of the stopper member (7, 8) becomes large, and it becomes difficult to maintain the engaged relationship between the brake gear 43 and the stopper member (7, 8).

[0092] In addition, since the first stopper member 7 has a plurality of claws, even if one of the claws is broken, the overall function of the first stopper member 7 is not immediately impaired. Thus, for the breaking load of each of the claws of the first stopper member 7, an excessive safety factor need not be set. Thus, the degree of freedom of the material of the first stopper member 7 can be increased, or the first stopper member 7 can be made lighter. In contrast, when the first stopper member 7 has only one claw, in order to prevent the single claw from being broken, the safety factor must be set to be high.

[0093] Further, in the first embodiment, in order to satisfy the two opposite conditions (in other words, the condition that the number of teeth 44 of the brake gear 43 is large, and the condition that the contact area between the brake gear 43 and the second stopper member 8 is sufficiently ensured), the second stopper member 8 includes a second claw group 85 (in other words, a plurality of claws) that can engage at least two teeth 44 of the brake gear 43 at the same time. The second stopper member 8 has a plurality of claws that can engage at least two teeth 44 of the brake gear 43 at the same time, whereby even if the number of teeth 44 of the brake gear 43 is large, the total contact area between the brake gear 43 and the second stopper member 8 can be sufficiently ensured.

[0094] In addition, since the second stopper member 8 has a plurality of claws, even if one of the claws is broken, the overall function of the second stopper member 8 is not immediately impaired. Thus, for the breaking load of each of the claws of the second stopper member 8, an excessive safety factor need not be set. Thus, the degree of freedom of the material of the second stopper member 8 can be increased, or the second stopper member 8 can be made lighter. In contrast, when the second stopper member 8 has only one claw, in order to prevent the single claw from being broken, the safety factor must be set to be high.

[0095] Further, in the first embodiment, the string tightener 1A has the first stopper member 7 and the second stopper member 8. Thus, even if an impact or the like is applied to the string tightener 1A, causing one of the first stopper member 7 and the second stopper member 8 to be disengaged from the brake gear 43, the other of the first stopper member 7 and the second stopper member 8 will engage the brake gear 43. Thus, the safety of the string tightener 1A can be ensured doubly.

[0096] Further, in the first embodiment, since the number of claws of each of the stopper members (7, 8) is increased simply in response to an increase in the number of teeth 44 of the brake gear 43, the number of parts of the string tightener 1A does not increase.

[0097] Next, with reference to Figures 1 to 14 , any additional structures that can be employed in the string tightener 1A of the first embodiment will be described.

[0098] (Brake gear 43 and rotating body 45)

[0099] In Figure 1 In the example described, in response to the operation section 50 being operated (for example, in response to the operation handle 51 being operated in the first operation direction MR1), the brake gear 43 rotates about the first axis AX1.

[0100] In Figure 2 In the example described, in response to the brake gear 43 rotating in the first rotation direction R1, the rotating body 45 applies a pulling force to the pulling member 10. The rotating body 45 is connected to the brake gear 43 so as to be able to transmit a force through any transmission mechanism. In Figure 2 In the example described, the rotation axis AX of the rotating body 45 and the first axis AX1 (in other words, the rotation axis of the brake gear 43) are different. Alternatively, the rotation axis AX of the rotating body 45 can coincide with the rotation axis of the brake gear 43.

[0101] In Figure 3 In the example described, the brake gear 43 is supported so as to be able to rotate about the first axis AX1 by a first shaft 42a that is installed in the frame 40 of the pulling device 4. A plurality of teeth 44 are formed in the outer peripheral portion of the brake gear 43.

[0102] The number of teeth 44 of the brake gear 43 is, for example, 20 or more, 24 or more, 30 or more, or 36 or more. When the number of teeth 44 of the brake gear 43 is 20 or more, it is easier to adjust the tension of the pulling member 10 to the target tension than when the number of teeth of the brake gear is a dozen or so. For example, when the number of teeth 44 of the brake gear 43 is 24 or more, the rotation angle of the brake gear 43 about the first axis AX1 that is required for the pawl of the first stop member 7 (or the pawl of the second stop member 8) to pass over one tooth is sufficient if it is 15 degrees or less. When the number of teeth 44 of the brake gear 43 is 30 or more, the rotation angle of the brake gear 43 about the first axis AX1 that is required for the pawl of the first stop member 7 (or the pawl of the second stop member 8) to pass over one tooth is sufficient if it is 12 degrees or less. When the number of teeth 44 of the brake gear 43 is 36 or more, the rotation angle of the brake gear 43 about the first axis AX1 that is required for the pawl of the first stop member 7 (or the pawl of the second stop member 8) to pass over one tooth is sufficient if it is 10 degrees or less.

[0103] (First stop member 7)

[0104] In Figure 3 In the example described, the first stop member 7 is supported so as to be able to swing about the second axis AX2 by a second pin member 42b that is installed in the frame 40 of the pulling device 4.

[0105] In Figure 3In the example described, the first stopper member 7 includes a distal arm 71, a proximal arm 72, and a central portion 73 disposed between the distal arm 71 and the proximal arm 72. The second axis AX2 (or the second latch member 42b) is disposed so as to pass through the central portion 73.

[0106] The front end arm 71 of the first stopper member 7 has a first front end portion 711, and a first claw group 75 is formed on this first front end portion 711. The first claw group 75 is biased toward the brake gear 43 by a first biasing member 46 (e.g., a first spring). The first biasing member 46 is disposed between the frame 40 of the traction device 4 (or any supporting member attached to the frame 40) and the base end arm 72 of the first stopper member 7.

[0107] exist Figure 4 In the described example, the front end side arm 71 includes a first side edge portion 712 and a second side edge portion 713 on the opposite side of the first side edge portion 712 .

[0108] The first claw group 75 includes a first claw 75a and a second claw 75b. The first claw group 75 may also include a third claw 75c, or other claws. In other words, the number of claws constituting the first claw group 75 may be two, three, or four or more. The plurality of claws constituting the first claw group 75 are respectively arranged at the first front end portion 711 of the first stop member 7. Figure 4 In the example described, the first claw 75a is arranged in the area on the side of the first side edge portion 712 of the first front end portion 711 of the first stop member 7, the third claw 75c is arranged in the area on the side of the second side edge portion 713 of the first front end portion 711 of the first stop member 7, and the second claw 75b is arranged between the first claw 75a and the third claw 75c.

[0109] exist Figure 3 In the example described, when viewed from a direction parallel to the first axis AX1, all of the claws constituting the first claw group 75 are positioned downstream of the line segment N1 connecting the first axis AX1 and the second axis AX2 in the first rotational direction R1. In other words, when the brake gear 43 rotates in the first rotational direction R1, the teeth 44 of the brake gear 43 are configured to contact the first claw group 75 after passing through the line segment N1. Figure 3 In the described example, when viewed from a direction parallel to the first axis AX1, all claws constituting the first claw group 75 are arranged between a line segment N1 connecting the first axis AX1 and the second axis AX2 and a line segment N2 connecting the first axis AX1 and the third axis AX3.

[0110] (Second stopper member 8)

[0111] exist Figure 3In the example described, the second stop member 8 is supported so as to be swingable about the third axis AX3 by a third pin member 42c that is mounted to the frame 40 of the traction device 4. The second stop member 8 is disposed on a downstream side in the first rotation direction Rl farther than the first stop member 7.

[0112] In Figure 3 In the example described, an angle formed between a line segment Nl connecting the first axis AXl and the second axis AX2 and a line segment N2 connecting the first axis AXl and the third axis AX3 is 120 degrees or less (more specifically, 90 degrees or less) as viewed from a direction parallel to the first axis AXl. In Figure 2 In the example described, when the traction member 10 is being tractioned by the traction device 4, a portion of the traction member 10 passes between the second axis AX2 and the third axis AX3, and another portion of the traction member 10 passes between the first axis AXl and the third axis AX3.

[0113] In Figure 3 In the example described, the second stop member 8 has a front end side arm 81, a base end side arm 82, and a central portion 83 disposed between the front end side arm 81 and the base end side arm 82. The third axis AX3 (or the third pin member 42c) is disposed so as to pass through the central portion 83.

[0114] The front end side arm 81 of the second stop member 8 has a second front end portion 811 in which a second claw set 85 is formed. The second claw set 85 is urged toward the direction of the brake gear 43 by a second urging member 47 (e.g., a second spring). The second urging member 47 is disposed between the frame 40 of the traction device 4 (or, any support member mounted to the frame 40) and the base end side arm 82 of the second stop member 8.

[0115] In Figure 4 In the example described, the front end side arm 81 has a first side edge portion 812 and a second side edge portion 813 on the opposite side of the first side edge portion 812.

[0116] The second claw set 85 includes a fourth claw 85a and a fifth claw 85b. The second claw set 85 can also include a sixth claw 85c, and can include other claws as well. In other words, the number of claws constituting the second claw set 85 can also be two, three, or four or more. The plurality of claws constituting the second claw set 85 are respectively disposed at the second front end portion 811 of the second stop member 8. In Figure 4In the example described, the fourth pawl 85a is disposed in a region of the second front end portion 811 of the second stop member 8 on the first side edge portion 812 side, the sixth pawl 85c is disposed in a region of the second front end portion 811 of the second stop member 8 on the second side edge portion 813 side, and the fifth pawl 85b is disposed between the fourth pawl 85a and the sixth pawl 85c.

[0117] In Figure 3 In the example described, when viewed from a direction parallel to the first axis AX1, all of the pawls constituting the second pawl group 85 are disposed on a downstream side of the first rotation direction R1 from a line segment N2 connecting the first axis AX1 and the third axis AX3. In other words, when the brake gear 43 is rotated in the first rotation direction R1, each tooth 44 of the brake gear 43 is configured to contact the second pawl group 85 after passing the line segment N2.

[0118] (First pawl 75a, second pawl 75b, third pawl 75c, fourth pawl 85a, fifth pawl 85b, sixth pawl 85c)

[0119] In Figure 4 In the example described, among the plurality of pawls constituting the first pawl group 75, the first pawl 75a is disposed on a most downstream side of the first rotation direction R1 in a direction along the first rotation direction R1. The second pawl 75b is disposed on an upstream side of the first rotation direction R1 from the first pawl 75a. Further, the third pawl 75c is disposed on an upstream side of the first rotation direction R1 from the second pawl 75b. In this case, when the brake gear 43 is rotated in the first rotation direction R1, the first pawl 75a, the second pawl 75b, and the third pawl 75c are configured to pass over each tooth of the brake gear 43 in the order of the third pawl 75c, the second pawl 75b, and the first pawl 75a.

[0120] As Figure 4 In the example described, the distance between the second axis AX2 and the front end of the first pawl 75a is defined as a first distance L1, and the distance between the second axis AX2 and the front end of the second pawl 75b is defined as a second distance L2. In Figure 4 In the example described, the first distance L1 is greater than the second distance L2. Further, in Figure 4 In the example described, when the distance between the second axis AX2 and the front end of the third pawl 75c is defined as a third distance L3, the third distance L3 is smaller than the second distance L2.

[0121] In Figure 4In the example described, among the plurality of pawls constituting the second pawl group 85, the fourth pawl 85a is disposed on the most downstream side in the direction along the first rotation direction Rl. The fifth pawl 85b is disposed on the upstream side in the first rotation direction Rl than the fourth pawl 85a. Further, the sixth pawl 85c is disposed on the upstream side in the first rotation direction Rl than the fifth pawl 85b. In this case, when the brake gear 43 rotates in the first rotation direction Rl, the fourth pawl 85a, the fifth pawl 85b, and the sixth pawl 85c are configured to pass over the teeth of the brake gear 43 in the order of the sixth pawl 85c, the fifth pawl 85b, and the fourth pawl 85a.

[0122] As Figure 4 illustrated, the distance between the third axis AX3 and the front end of the fourth pawl 85a is defined as a fourth distance L4, and the distance between the third axis AX3 and the front end of the fifth pawl 85b is defined as a fifth distance L5. In Figure 4 the example described, the fourth distance L4 is larger than the fifth distance L5. Further, in Figure 4 the example described, when the distance between the third axis AX3 and the front end of the sixth pawl 85c is defined as a sixth distance L6, the sixth distance L6 is smaller than the fifth distance L5 described above.

[0123] Although in Figure 4 the example described, the fourth distance L4 is smaller than the first distance Ll, the fourth distance L4 can also be equal to or larger than the first distance Ll. Although in Figure 4 the example described, the fifth distance L5 is smaller than the second distance L2, the fifth distance L5 can also be equal to or larger than the second distance L2. Although in Figure 5 the example described, the sixth distance L6 is smaller than the third distance L3, the sixth distance L6 can also be equal to or larger than the third distance L3.

[0124] In Figure 5 the example described, from the direction parallel to the second axis AX2 (in other words, from the direction parallel to the swing axis of the first stop member 7), the angle a formed between a first straight line Tl connecting the second axis AX2 and the front end of the first pawl 75a and a second straight line T2 connecting the front end of the first pawl 75a and the front end of the second pawl 75b is 45 degrees or less.

[0125] Further, in Figure 5In the example described, the angle β between the third straight line T3 connecting the third axis AX3 and the front end of the fourth pawl 85a and the fourth straight line T4 connecting the front end of the fourth pawl 85a and the front end of the fifth pawl 85b is 45 degrees or less when viewed in a direction parallel to the third axis AX3 (in other words, when viewed in a direction parallel to the swing axis of the second stop member 8). Figure 6 In the example described, the angle β is larger than the angle α described above. Alternatively, the angle β can be smaller than the angle α described above, or can be equal to the angle α described above.

[0126] As Figure 6 As Figure 6 In the example described, the second ratio (F2 / C2) is larger than the first ratio (Fl / C1).

[0127] The first pawl 75a receives a relatively large compression force (Cl), and the first pawl 75a effectively prevents the rotation of the brake gear 43 in the second rotational direction R2. In addition, since the second pawl 75b receives a relatively large rotational force (F2), the second pawl 75b is not easily detached from the brake gear 43. In this way, the first pawl 75a and the second pawl 75b cooperate to effectively function as the rotation prevention function of the brake gear 43 in the second rotational direction R2 and the detachment prevention function of the first stop member 7 from the brake gear 43.

[0128] As Figure 6 As Figure 7 In the example described, the third ratio (F3 / C3) is larger than the second ratio (F2 / C2). Since the third pawl 75c receives a larger rotational force (F3), the third pawl 75c is less likely to be detached from the brake gear 43.

[0129] As Figure 7The ratio (F4 / C4) of the force F4 around the third axis AX3 that the fourth claw 85a receives from the brake gear 43 to the force C4 in the direction toward the third axis AX3 that the fourth claw 85a receives from the brake gear 43 when the brake gear 43 rotates in the second rotational direction R2 is defined as a fourth ratio. The ratio (F5 / C5) of the force F5 around the third axis AX3 that the fifth claw 85b receives from the brake gear 43 to the force C5 in the direction toward the third axis AX3 that the fifth claw 85b receives from the brake gear 43 when the brake gear 43 rotates in the second rotational direction R2 is defined as a fifth ratio. In this case, the fourth claw 85a receives a relatively large compression force (C4), and the fourth claw 85a effectively prevents the rotation of the brake gear 43 in the second rotational direction R2. In addition, since the fifth claw 85b receives a relatively large rotational force (F5), the fifth claw 85b is not easily detached from the brake gear 43. In this way, the fourth claw 85a and the fifth claw 85b cooperate with each other, and effectively function to prevent the rotation of the brake gear 43 in the second rotational direction R2 and to prevent the detachment of the second stop member 8 from the brake gear 43. Figure 7 In the example described, the fifth ratio (F5 / C5) is larger than the fourth ratio (F4 / C4).

[0130] The fourth claw 85a receives a relatively large compression force (C4), and the fourth claw 85a effectively prevents the rotation of the brake gear 43 in the second rotational direction R2. In addition, since the fifth claw 85b receives a relatively large rotational force (F5), the fifth claw 85b is not easily detached from the brake gear 43. In this way, the fourth claw 85a and the fifth claw 85b cooperate with each other, and effectively function to prevent the rotation of the brake gear 43 in the second rotational direction R2 and to prevent the detachment of the second stop member 8 from the brake gear 43.

[0131] As Figure 7 The ratio (F6 / C6) of the force F6 around the third axis AX3 that the sixth claw 85c receives from the brake gear 43 to the force C6 in the direction toward the third axis AX3 that the sixth claw 85c receives from the brake gear 43 when the brake gear 43 rotates in the second rotational direction R2 is defined as a sixth ratio. In this case, the fourth claw 85a receives a relatively large compression force (C4), and the fourth claw 85a effectively prevents the rotation of the brake gear 43 in the second rotational direction R2. In addition, since the fifth claw 85b receives a relatively large rotational force (F5), the fifth claw 85b is not easily detached from the brake gear 43. In this way, the fourth claw 85a and the fifth claw 85b cooperate with each other, and effectively function to prevent the rotation of the brake gear 43 in the second rotational direction R2 and to prevent the detachment of the second stop member 8 from the brake gear 43. Figure 8 In the example described, the sixth ratio (F6 / C6) is larger than the fifth ratio (F5 / C5). Since the sixth claw 85c receives a larger rotational force (F6), the sixth claw 85c is more difficult to be detached from the brake gear 43.

[0132] In Figure 8In the example described in (a), when the multiple claws (75a, 75b, 75c) constituting the first claw group 75 are in a state of engagement with the brake gear 43, the multiple claws (85a, 85b, 85c) constituting the second claw group 85 are respectively configured to always maintain a state of non-engagement with the brake gear 43 (in addition, although the sixth claw 85c contacts the brake gear 43, it is not engaged with the brake gear 43). In this case, if the multiple claws (75a, 75b, 75c) constituting the first claw group 75 are disengaged from the brake gear 43 due to an impact or the like applied to the tensioner 1A, the multiple claws (85a, 85b, 85c) constituting the second claw group 85 in the standby position (in other words, the non-engaged position) will quickly advance to the engaged position with the brake gear 43. This improves safety against impact or the like.

[0133] In addition, Figure 8 In the example described in (b), when the multiple claws (85a, 85b, 85c) constituting the second claw group 85 are in a state of being engaged with the brake gear 43, the multiple claws (75a, 75b, 75c) constituting the first claw group 75 are respectively configured to always maintain a non-engaged state with the brake gear 43 (in addition, although the third claw 75c contacts the brake gear 43, it is not engaged with the brake gear 43). In this case, if the multiple claws (85a, 85b, 85c) constituting the second claw group 85 are disengaged from the brake gear 43 due to an impact or the like applied to the tensioner 1A, the multiple claws (75a, 75b, 75c) constituting the first claw group 75 in the standby position (in other words, the non-engaged position) will quickly advance to the engaged position with the brake gear 43. This can improve safety against impact or the like.

[0134] In contrast, consider a situation where an impact or the like is applied to the tensioner 1A while both the plurality of claws (75a, 75b, 75c) constituting the first claw group 75 and the plurality of claws (85a, 85b, 85c) constituting the second claw group 85 are engaged with the brake gear 43. In this situation, there is a possibility that the plurality of claws (75a, 75b, 75c) constituting the first claw group 75 and the plurality of claws (85a, 85b, 85c) constituting the second claw group 85 may simultaneously disengage from the brake gear 43. Furthermore, there is a possibility that the plurality of claws (75a, 75b, 75c) constituting the first claw group 75 and the plurality of claws (85a, 85b, 85c) constituting the second claw group 85 may require time to return to their engaged positions with the brake gear 43.

[0135] exist Figure 8In the example described, the brake gear 43 rotates in the first rotational direction Rl about the first axis AXl, and each time the brake gear 43 rotates by an angle corresponding to half a tooth of the teeth 44 of the brake gear 43, the first claw set 75 and the second claw set 85 are configured to alternately engage the plurality of teeth 44 of the brake gear 43. In addition, in Figure 8 In (a), the angle corresponding to half a tooth is schematically shown by dotted lines.

[0136] In other words, in Figure 8 In the example described, when the number of teeth of the brake gear 43 is defined as "N" (in other words, when the number of teeth of the brake gear 43 is N), each time the brake gear 43 rotates by (180 / N) degrees in the first rotational direction Rl about the first axis AXl, the first claw set 75 and the second claw set 85 are configured to alternately engage the plurality of teeth 44 of the brake gear 43. For example, in Figure 9 In the example described, the number of teeth of the brake gear 43 is 36 (N = 36). In this case, each time the brake gear 43 rotates by 5 degrees (= 180 / 36 degrees) in the first rotational direction Rl about the first axis AXl, the first claw set 75 and the second claw set 85 are configured to alternately engage the plurality of teeth 44 of the brake gear 43.

[0137] When one of the first claw set 75 and the second claw set 85 is configured to engage the plurality of teeth 44 of the brake gear 43 each time the brake gear 43 rotates by an angle corresponding to half a tooth of the teeth 44 of the brake gear 43, it becomes easier to adjust the tension of the traction member 10 to the target tension.

[0138] (Operation handle 51, ratchet gear 53, mode switching device 6)

[0139] In Figure 9 In the example described, the tightener 1A (more specifically, the traction device 4) has an operation handle 51, a ratchet gear 53, and a mode switching device 6. The operation handle 51 can be swung about the first axis AXl.

[0140] As Figure 1 illustrated, when the switching operation member 60 of the mode switching device 6 is in the first position P1, by operating the operation handle 51 about the first axis AXl in the first operation direction MRl, the traction device 4 pulls the traction member 10 (for example, the chain 10a) toward the traction device 4. In Figure 10 In the example described, the traction member 10 is pulled from the first member 2 toward the traction device 4, thereby increasing the tension of the traction member 10.

[0141] As Figure 9As illustrated, when the switching operating member 60 of the mode switching device 6 is in the second position P2, the operating handle 51 is operated in the second operating direction MR2 about the first axis AX1, and the traction device 4 feeds the traction member 10 (e.g., the chain 10a) from the traction device 4 toward the first member 2. This relaxes the tension in the traction member 10.

[0142] The ratchet gear 53 is rotatable about the first axis AX1 and has a plurality of teeth 54. The ratchet gear 53 can transmit the operating force applied to the operating handle 51 to the brake gear 43 directly or indirectly through any transmission member.

[0143] The number of teeth 54 of the ratchet gear 53 can be, for example, 20 or more, 30 or more, 40 or more, 50 or more, or 60 or more. Due to the large number of teeth 54 of the ratchet gear 53, the operator can more precisely adjust the swing range of the operating handle 51 to suit the working environment or their own physique, without any strain. When the number of teeth 54 of the ratchet gear 53 is greater than the number of teeth 44 of the brake gear 43, the degree of freedom in adjusting the swing range is further increased. However, in the embodiments, the ratchet gear 53 may have fewer teeth 54 than the brake gear 43, or may have the same number of teeth 44 as the brake gear 43.

[0144] exist Figure 9 In the described example, the mode switching device 6 includes a switching operation member 60 , a first engaging portion 61 , a second engaging portion 62 , a third urging member 63 (eg, a third spring), and a pressing member 64 .

[0145] exist Figure 9 In the example described, the switching member 60 is supported by the operating handle 51 (more specifically, the fourth latch member 52 provided on the operating handle 51) so as to be swingable about a fourth axis AX4 parallel to the first axis AX1. The fourth axis AX4 (or the fourth latch member 52) is disposed so as to pass through the center portion 60c of the switching member 60.

[0146] exist Figure 9 In the described example, the switching operating component 60 has a first side portion 60a, a second side portion 60b, and a central portion 60c between the first side portion 60a and the second side portion 60b. A first operated portion 65a that can be pressed by a user is arranged on the first side portion 60a, and a second operated portion 65b that can be pressed by a user is arranged on the second side portion 60b. In addition, a first engaging portion 61 is arranged at the front end portion of the first side portion 60a, and a second engaging portion 62 is arranged at the front end portion of the second side portion 60b. A pressed portion 66 that is pressed by the pressing component 64 is arranged at the rear end portion of the central portion 60c.Figure 9 In the described example, the pressed portion 66 of the switching operation member 60 includes a first cam surface 66 a , a second cam surface 66 b , and a receiving portion 66 c disposed between the first cam surface 66 a and the second cam surface 66 b .

[0147] The switching operation member 60 can be moved around the fourth axis AX4 at the first position P1 (see Figure 10 ) and the second position P2 (refer to Figure 11 The switching operation member 60 can also swing around the fourth axis AX4 parallel to the first axis AX1, through the third position P3 (refer to Figure 9 ) and swings between a first position P1 and a second position P2. The first position P1 corresponds to a pulling position, which is used when pulling the traction member 10 toward the traction device 4. The second position P2 corresponds to a pulling position, which is used when pulling the traction member 10 out of the traction device 4. Furthermore, the third position P3 corresponds to a neutral position, which is used when directly pulling the traction member 10 toward the traction device 4 (or pulling the traction member 10 out of the traction device 4) without using the operating handle 51.

[0148] exist Figure 10 In the example described, the first engagement portion 61 is disposed on the switching operation member 60. When the switching operation member 60 is located at the first position P1, the first engagement portion 61 and the ratchet gear 53 engage with each other.

[0149] When the switching operating member 60 is in the first position P1, the first engaging portion 61 and the ratchet gear 53 remain engaged when the operating handle 51 is operated in the first operating direction MR1. Thus, when the operating handle 51 is operated in the first operating direction MR1, the operating handle 51, the switching operating member 60, and the ratchet gear 53 rotate integrally in the first rotational direction R1 about the first axis AX1. On the other hand, when the switching operating member 60 is in the first position P1, the first engaging portion 61 moves over the teeth 54 of the ratchet gear 53 when the operating handle 51 is operated in the second operating direction MR2 (in other words, the direction opposite to the first operating direction MR1). Thus, when the operating handle 51 is operated in the second operating direction MR2, the operating handle 51 rotates idly relative to the ratchet gear 53.

[0150] exist Figure 9 In the example described, the second engagement portion 62 is disposed on the switching operation member 60. When the switching operation member 60 is located at the second position P2, the second engagement portion 62 and the ratchet gear 53 engage with each other.

[0151] When the switching operation member 60 is in the second position P2, when the operation knob 51 is operated in the first operation direction MR1, the second engagement portion 62 moves over the teeth 54 of the ratchet gear 53. Thus, when the operation knob 51 is operated in the first operation direction MR1, the operation knob 51 idles with respect to the ratchet gear 53. On the other hand, when the switching operation member 60 is in the second position P2, when the operation knob 51 is operated in the second operation direction MR2, the engaged state between the second engagement portion 62 and the ratchet gear 53 is maintained. Thus, when the operation knob 51 is operated in the second operation direction MR2, the operation knob 51, the switching operation member 60, and the ratchet gear 53 rotate integrally in the second rotation direction R2 about the first axis AX1.

[0152] The third urging member 63 urges the pressing member 64 in the direction toward the switching operation member 60. The third urging member 63 urges the pressing member 64 in the direction toward the switching operation member 60, thereby maintaining the contact state between the pressing member 64 and the switching operation member 60.

[0153] The pressing member 64 can selectively press the first cam surface 66a of the switching operation member 60 and the second cam surface 66b of the switching operation member 60. The pressing member 64 can also selectively press the first cam surface 66a, the second cam surface 66b, and the receiving portion 66c. The pressing member 64 is, for example, a spherical body.

[0154] As Figure 9 illustrated, when the switching operation member 60 is in the first position PI, the first cam surface 66a is pressed by the pressing member 64. By the pressing member 64 pressing the first cam surface 66a, the position of the switching operation member 60 is maintained in the first position PI, and the engaged state between the first engagement portion 61 and the ratchet gear 53 is maintained. Further, in Figure 10 the example described above, when the operation knob 51 is operated in the second operation direction MR2, thereby moving the first engagement portion 61 over the teeth 54 of the ratchet gear 53, the first cam surface 66a slides with respect to the pressing member 64. Thereafter, by the pressing member 64 pressing the first cam surface 66a, the first engagement portion 61 returns to the position engaged with the ratchet gear 53.

[0155] As Figure 10 illustrated, when the switching operation member 60 is in the second position P2, the second cam surface 66b is pressed by the pressing member 64. By the pressing member 64 pressing the second cam surface 66b, the position of the switching operation member 60 is maintained in the second position P2, and the engaged state between the second engagement portion 62 and the ratchet gear 53 is maintained. Further, in Figure 11In the example described, when the operation handle 51 is operated in the first operation direction MR1, thereby moving the second engagement portion 62 over the teeth 54 of the ratchet gear 53, the second cam surface 66b slides with respect to the pressing member 64. Thereafter, the second engagement portion 62 returns to the position engaged with the ratchet gear 53 by the pressing member 64 pressing the second cam surface 66b.

[0156] As Figure 12 illustrated, when the switching operation member 60 is located at the third position P3, the pressing member 64 is received by the receiving portion 66c of the switching operation member 60. Conversely, when the pressing member 64 is received by the receiving portion 66c of the switching operation member 60, the position of the switching operation member 60 is maintained at the third position P3. When the switching operation member 60 is located at the third position P3, neither the first engagement portion 61 nor the second engagement portion 62 is engaged with the ratchet gear 53. Thus, when the switching operation member 60 is located at the third position P3, the pulling member 10 can be directly pulled without using the operation handle 51, thereby pulling the pulling member 10 toward the pulling device 4 (or pulling the pulling member 10 from the pulling device 4).

[0157] In Figure 12 the example described, the first engagement portion 61 of the switching operation member 60 includes a first tooth group 610, and when the switching operation member 60 is located at the first position PI, the first tooth group 610 simultaneously engages a plurality of teeth 54 of the ratchet gear 53. The first tooth group 610 includes a first tooth 610a and a second tooth 610b. The first tooth group 610 can also include a third tooth 610c and a fourth tooth 610d. In other words, the number of teeth constituting the first tooth group 610 can be two, three, or more than four. The plurality of teeth constituting the first tooth group 610 are respectively arranged at the front end of the first side portion 60a of the switching operation member 60.

[0158] In Figure 13 the example described, in order to satisfy the two opposite conditions (i.e., the condition that the number of teeth 54 of the ratchet gear 53 is large, and the condition that the contact area between the ratchet gear 53 and the first engagement portion 61 is sufficiently ensured), the first engagement portion 61 includes a first tooth group 610 (in other words, a plurality of teeth) that can simultaneously engage at least two teeth 54 (or at least three teeth 54) of the ratchet gear 53. The first engagement portion 61 has a plurality of teeth that can simultaneously engage at least two teeth 54 of the ratchet gear 53, thereby sufficiently ensuring the total contact area between the ratchet gear 53 and the first engagement portion 61 even if the number of teeth 54 of the ratchet gear 53 is large.

[0159] In Figure 13In the example described, the second engaging portion 62 of the switching operation member 60 includes a second tooth group 620, and when the switching operation member 60 is positioned at the second position P2, the second tooth group 620 engages a plurality of teeth 54 of the ratchet gear 53 at the same time. The second tooth group 620 includes a fifth tooth 620a and a sixth tooth 620b. The second tooth group 620 can also include a seventh tooth 620c, and can also include an eighth tooth 620d. In other words, the number of teeth that make up the second tooth group 620 can also be two, can also be three, and can also be four or more. The plurality of teeth that make up the second tooth group 620 are respectively arranged at the front end portion of the second side portion 60b of the switching operation member 60.

[0160] In Figure 2 In the example described, in order to satisfy the two conditions that are opposite to each other (i.e., the condition that the number of teeth 54 of the ratchet gear 53 is large, and the condition that the contact area between the ratchet gear 53 and the second engaging portion 62 is sufficiently ensured), the second engaging portion 62 includes a second tooth group 620 (in other words, a plurality of teeth) that can engage at least two teeth 54 (or at least three teeth 54) of the ratchet gear 53 at the same time. The second engaging portion 62 has a plurality of teeth that can engage at least two teeth 54 of the ratchet gear 53 at the same time, and thus even if the number of teeth 54 of the ratchet gear 53 is large, the total contact area between the ratchet gear 53 and the second engaging portion 62 can still be sufficiently ensured.

[0161] (Transmission mechanism M)

[0162] Referring to Figure 9 , Figure 10 , Figure 14 , Figure 14 , an example of a mechanism that transmits an operation force applied to the operation handle 51 to the rotating body 45 will be described. Figure 9 is a schematic view for describing an example of a transmission mechanism M that transmits an operation force applied to the operation handle 51 to the rotating body 45.

[0163] An example of a case in which the traction member 10 (e.g., the chain 10a) is pulled into the traction device 4 from the first member 2 will be described.

[0164] In the first step ST1, the position of the switching operation member 60 is set at the first position PI (refer to Figure 14 ). By setting the position of the switching operation member 60 at the first position PI, the first engaging portion 61 engages the ratchet gear 53. In the second step ST2, the operation handle 51 is operated in the first operation direction MR1. Since the first engaging portion 61 engages the ratchet gear 53, when the operation handle 51 is operated in the first operation direction MR1, the operation handle 51 and the ratchet gear 53 rotate integrally in the first rotation direction R1 about the first shaft AX1.

[0165] exist Figure 14 In the example described, the ratchet gear 53 and the brake gear 43 are connected so as to transmit force through the disk 68, etc. Therefore, when the ratchet gear 53 rotates in the first rotation direction R1, the brake gear 43 rotates in the first rotation direction R1 around the first axis AX1.

[0166] exist Figure 14 In the example described, the brake gear 43 and the pinion 69 are fixed to the first shaft 42a extending along the first axis AX1. Therefore, when the brake gear 43 rotates in the first rotational direction R1, the first shaft 42a and the pinion 69 rotate about the first axis AX1 in the first rotational direction R1.

[0167] exist Figure 14 In the example shown, the pinion 69 meshes with the rotating gear 91 rotatable about the rotation axis AX. Therefore, when the pinion 69 rotates in the first rotation direction R1, the rotating gear 91 rotates in the third rotation direction R3 about the rotation axis AX.

[0168] exist Figure 14 In the example described, the rotating gear 91 and the rotating body 45 are fixed to the second shaft 92 extending along the rotation axis AX. Therefore, when the rotating gear 91 rotates in the third rotation direction R3, the second shaft 92 and the rotating body 45 rotate about the rotation axis AX in the third rotation direction R3.

[0169] exist Figure 2 In the example described, the traction member 10 is wrapped around the rotating body 45. Therefore, when the rotating body 45 rotates in the third rotational direction R3, the traction member 10 is pulled from the first component 2 into the traction device 4 (see arrow AR1). This increases the tension in the traction member 10.

[0170] In the third step ST3, the operating handle 51 is operated in the second operating direction MR2. When the operating handle 51 is operated in the second operating direction MR2, the operating handle 51 rotates in the second rotational direction R2 about the first axis AX1. Furthermore, when the operating handle 51 rotates in the second rotational direction R2, the operating handle 51 rotates idly relative to the ratchet gear 53. Thus, the traction member 10 does not become loosened due to the operating handle 51 being operated in the second operating direction MR2.

[0171] like Figure 10As shown, the first stopper 7 includes a first pawl set 75 that can simultaneously engage at least two teeth of the brake gear 43, and the second stopper 8 includes a second pawl set 85 that can simultaneously engage at least two teeth of the brake gear 43. This effectively prevents the brake gear 43, which has a large number of teeth, from rotating in the second rotational direction R2. Thus, during the execution of the third step ST3, the tension of the traction member 10 can be stably maintained.

[0172] By repeatedly executing the second step ST2 and the third step ST3, the tension of the traction member 10 can be brought close to the target tension. Alternatively, a tension meter (not shown) may be installed in the tensioner 1A. In this case, the operator can easily verify that the tension acting on the traction member 10 is approaching the target tension by observing the tension meter.

[0173] In the first embodiment, since the first stopper member 7 includes a first pawl group 75 that can simultaneously engage with at least two teeth of the brake gear 43, and the second stopper member 8 includes a second pawl group 85 that can simultaneously engage with at least two teeth of the brake gear 43, a brake gear 43 with a large number of teeth can be used. In this case, the final stage of the final second step ST2 can be easily executed while a tension close to the target tension is acting on the traction member 10. More specifically, since the tension of the traction member 10 does not significantly exceed the target tension after execution of the final second step ST2, the maximum operating force acting on the operating handle 51 is relatively small. Furthermore, since the rotation angle of the brake gear 43 is relatively small when the first pawl group 75 and / or the second pawl group 85 pass over each tooth of the brake gear 43, the movement of the operating handle 51 during the final stage of the final second step ST2 (in other words, the final pass over the teeth 44 of the brake gear 43) is relatively small.

[0174] Next, an example of a case where the pulling member 10 (for example, the chain 10 a ) is pulled out from the pulling device 4 to the first component 2 side will be described.

[0175] In the first step ST101, the position of the switching operating member 60 is set to the second position P2 (refer to Figure 14 By setting the switching operating member 60 to the second position P2, the second engaging portion 62 engages with the ratchet gear 53. In the second step ST102, the operating handle 51 is operated in the second operating direction MR2. Because the second engaging portion 62 and the ratchet gear 53 are engaged, when the operating handle 51 is operated in the second operating direction MR2, the operating handle 51 and the ratchet gear 53 rotate integrally about the first axis AX1 in the second rotational direction R2.

[0176] exist Figure 14In the example described, the ratchet gear 53 is connected to the brake gear 43 so as to transmit force through the force transmission member such as the disc 68. Thus, when the ratchet gear 53 rotates in the second rotational direction R2, the brake gear 43 rotates in the second rotational direction R2 about the first axis AXl.

[0177] In Figure 14 In the example described, the brake gear 43 and the pinion gear 69 are fixed to the first shaft 42a. Thus, when the brake gear 43 rotates in the second rotational direction R2, the first shaft 42a and the pinion gear 69 rotate in the second rotational direction R2 about the first axis AXl.

[0178] In Figure 14 In the example described, the pinion gear 69 engages with the rotation gear 91, which is rotatable about the rotation axis AX. Thus, when the pinion gear 69 rotates in the second rotational direction R2, the rotation gear 91 rotates in the fourth rotational direction R4 about the rotation axis AX.

[0179] In Figure 14 In the example described, the rotation gear 91 and the rotation body 45 are fixed to the second shaft 92. Thus, when the rotation gear 91 rotates in the fourth rotational direction R4, the second shaft 92 and the rotation body 45 rotate in the fourth rotational direction R4 about the rotation axis AX.

[0180] In Figure 15 In the example described, the traction member 10 is hung around the rotation body 45. Thus, when the rotation body 45 rotates in the fourth rotational direction R4, the traction member 10 is pulled out from the traction device 4 to the first member 2 side (see arrow AR2). In this way, the tension of the traction member 10 is reduced.

[0181] In the third step ST103, the operation handle 51 is operated in the first operation direction MRl. When the operation handle 51 is operated in the first operation direction MRl, the operation handle 51 rotates in the first rotational direction Rl about the first axis AXl. In addition, when the operation handle 51 rotates in the first rotational direction Rl, the operation handle 51 idles with respect to the ratchet gear 53.

[0182] The transmission mechanism M described above, or the mechanism described above that transmits the operation force applied to the operation handle 51 to the rotation body 45, is merely an example, and in the embodiment, other transmission mechanisms M or other mechanisms can of course be employed.

[0183] (Second Embodiment)

[0184] Referring to Figure 15 , the line tightener IB in the second embodiment will be described. ​ is a schematic side view that schematically shows the line tightener IB in the second embodiment.

[0185] In the second embodiment, the first claw set 75 of the first stopper member 7 includes only two claws (more specifically, only the first claw 75a and the second claw 75b), and the second claw set 85 of the second stopper member 8 includes only two claws (more specifically, only the fourth claw 85a and the fifth claw 85b), which is different from the first embodiment. In other points, the second embodiment is the same as the first embodiment.

[0186] In the above-described first embodiment and the above-described second embodiment, an example in which the number of claws constituting the first claw set 75 of the first stopper member 7 is equal to the number of claws constituting the second claw set 85 of the second stopper member 8 is described. Alternatively, the number of claws constituting the first claw set 75 of the first stopper member 7 can be more than the number of claws constituting the second claw set 85 of the second stopper member 8, or can be less than the number of claws constituting the second claw set 85 of the second stopper member 8.

[0187] The utility model is not limited to the above-mentioned embodiments or the above-mentioned variants, and within the scope of the technical idea of the utility model, it can be clearly understood that the embodiments or the variants can be appropriately deformed or changed. In addition, any component used in the embodiments or the variants can be combined with other embodiments or other variants, and in addition, any structural component can be omitted in the embodiments or the variants.

[0188] Industrial applicability

[0189] The utility model discloses a line tightener, which can easily adjust the tension of the traction member to the target tension. Therefore, it is useful for the operator who uses the line tightener to work and the manufacturer who manufactures the line tightener.

[0190] Symbol explanation:

[0191] 1, 1A, 1B: line tightener

[0192] 2: first member

[0193] 3: second member

[0194] 4: traction device

[0195] 6: mode switching device

[0196] 7: first stopper member

[0197] 8: second stopper member

[0198] 10: traction member

[0199] 10a: chain

[0200] 11: first end portion

[0201] 12: second end portion

[0202] 13: end stop

[0203] 21: mounting portion

[0204] 21f: first hook portion

[0205] 25: pulley

[0206] 31: second mounting portion

[0207] 31f: second hook portion

[0208] 40: frame

[0209] 41: latch member

[0210] 42a: first shaft

[0211] 42b: second latch member

[0212] 42c: third latch member

[0213] 43: pinion gear

[0214] 44: tooth

[0215] 45: rotating body

[0216] 46: first urging member

[0217] 47: second urging member

[0218] 50: operation portion

[0219] 51: operation handle

[0220] 52: fourth latch member

[0221] 53: ratchet gear

[0222] 54: tooth

[0223] 60: switching operation member

[0224] 60a: first side portion

[0225] 60b: second side portion

[0226] 60c: central portion

[0227] 61: first engagement portion

[0228] 62: second engagement portion

[0229] 63: third urging member

[0230] 64: pressing member

[0231] 65a: first operated portion

[0232] 65b: second operated portion

[0233] 66: pressed portion

[0234] 66a: first cam surface

[0235] 66b: second cam surface

[0236] 66c: receiving portion

[0237] 68: disc

[0238] 69: pinion

[0239] 71: front end side arm

[0240] 72: base end side arm

[0241] 73: central portion

[0242] 75: first claw group

[0243] 75a: first claw

[0244] 75b: second claw

[0245] 75c: third claw

[0246] 81: front end side arm

[0247] 82: base end side arm

[0248] 83: central portion

[0249] 85: second claw group

[0250] 85a: fourth claw

[0251] 85b: fifth claw

[0252] 85c: sixth claw

[0253] 91: rotary gear

[0254] 92: second shaft

[0255] 610: first tooth group

[0256] 610a: first tooth

[0257] 610b: second tooth

[0258] 610c: third tooth

[0259] 610d: fourth tooth

[0260] 620: second tooth group

[0261] 620a: fifth tooth

[0262] 620b: sixth tooth

[0263] 620c: seventh tooth

[0264] 620d: eighth tooth

[0265] 711: first front end portion

[0266] 712: first side edge portion

[0267] 713: second side edge portion

[0268] 811: second front end portion

[0269] 812: first side edge portion

[0270] 813: second side edge portion

[0271] AX: rotation axis

[0272] AX1: first axis

[0273] AX2: second axis

[0274] AX3: third axis

[0275] AX4: fourth axis

[0276] E: electric wire

[0277] G1: wire clipper

[0278] G2: flexible member

[0279] K: ring member

Claims

1. A tensioner, characterized in that: have: a first component mountable on a first mounting object; a second component mountable on a second mounting object; a pulling member to pull the first component toward the second component; and a traction device, traction said traction member, The traction device comprises: a rotating body for applying a traction force to the traction member; a brake gear having a plurality of teeth and being rotatable about a first axis to stop the rotation of the rotating body; a first stop member, capable of swinging about a second axis parallel to the first axis, allowing the brake gear to rotate in a first rotational direction and preventing the brake gear from rotating in a second rotational direction opposite to the first rotational direction; as well as The second stop member is swung around a third axis parallel to the second axis, allowing the brake gear to rotate in the first rotation direction and preventing the brake gear from rotating in the second rotation direction. The first stop member has a first claw group that can be simultaneously engaged with at least two teeth of the brake gear. The second stopping component has a second pawl group that can be simultaneously engaged with at least two teeth of the braking gear.

2. The tensioner according to claim 1, characterized in that: The first claw group can be engaged with at least three teeth of the brake gear simultaneously. The second pawl set can be simultaneously engaged with at least three teeth of the brake gear.

3. The tensioner according to claim 1, characterized in that: The first claw group comprises: First claw; as well as The second claw is arranged on the upstream side of the first rotation direction relative to the first claw, A distance between the second axis and the front end of the first claw is greater than a distance between the second axis and the front end of the second claw.

4. The tensioner according to claim 1, characterized in that: The first claw group comprises: First claw; as well as The second claw is arranged on the upstream side of the first rotation direction relative to the first claw, When viewed from a direction parallel to the second axis, an angle formed by a first straight line connecting the second axis and the front end of the first claw and a second straight line connecting the front end of the first claw and the front end of the second claw is less than 45 degrees.

5. The wire tensioner according to claim 1, characterized in that: The first claw group comprises: First claw; as well as The second claw is arranged on the upstream side of the first rotation direction relative to the first claw, When the brake gear rotates in the second rotation direction, the ratio of the force around the second axis received by the first pawl from the brake gear to the force in the direction toward the second axis received by the first pawl from the brake gear is defined as a first ratio. When the brake gear rotates in the second rotation direction, the ratio of the force around the second axis received by the second pawl from the brake gear to the force in the direction toward the second axis received by the second pawl from the brake gear is defined as a second ratio, the second ratio is greater than the first ratio.

6. The wire tensioner according to claim 1, characterized in that: When the plurality of claws constituting the first claw group are in a state of being engaged with the brake gear, the plurality of claws constituting the second claw group are respectively configured to always maintain a state of being not engaged with the brake gear. When the plurality of pawls constituting the second pawl group are in a state of being engaged with the brake gear, the plurality of pawls constituting the first pawl group are respectively configured to always maintain a state of being not engaged with the brake gear.

7. The wire tensioner according to claim 6, characterized in that: When the brake gear rotates around the first axis in the first rotation direction by an angle corresponding to half a tooth of the brake gear, the first claw group and the second claw group are configured to alternately engage with a plurality of teeth of the brake gear.

8. The wire tensioner according to any one of claims 1 to 7, characterized in that: Also features: an operating handle, capable of swinging about the first axis; a ratchet gear, capable of transmitting an operating force applied to the operating handle to the brake gear and capable of rotating about the first axis; as well as a mode switching device that specifies the direction in which the ratchet gear can rotate, The mode switching device comprises: a switching operating member capable of swinging between a first position and a second position about a fourth axis parallel to the first axis; a first engaging portion, disposed on the switching operating member, and engaging with the ratchet gear when the switching operating member is located at the first position; The second engaging portion is disposed on the switching operating member and engages with the ratchet gear when the switching operating member is located at the second position. The first engaging portion includes a first tooth set, and when the switching operating member is located at the first position, the first tooth set is simultaneously engaged with a plurality of teeth of the ratchet gear. The second engaging portion includes a second tooth set. When the switching operating member is located at the second position, the second tooth set is simultaneously engaged with a plurality of teeth of the ratchet gear.

9. The wire tensioner according to claim 8, characterized in that: The number of teeth of the ratchet gear is greater than the number of teeth of the brake gear.

Images