Quick-release pulley block and fitness equipment

Abstract

The utility model relates to a quick release type pulley block and fitness equipment, the quick release type pulley block is used for being installed on a rack, and the rack is provided with a first connecting part and a positioning hole. The quick-release pulley block comprises a main body, a positioning piece and an operating piece. The main body is provided with a pulley, a second connecting part and a back plate, the second connecting part is used for being detachably connected with the first connecting part, and a through groove is formed in the back plate. The positioning piece is movably arranged in the through groove. The operating part is movably connected to the main body and adjacent to the back plate, a receding groove is formed in the side, facing the back plate, of the operating part, and the operating part has a locking state and an unlocking state. In the locking state, the receding groove is staggered with the through groove, the operation piece abuts against the positioning piece to enable the positioning piece to stretch out of the side, back on to the operation piece, of the back plate and stretch into the positioning hole, and therefore the second connecting part is prevented from being detached from the first connecting part. In the unlocking state, the receding groove is aligned with the through groove, and the positioning piece can enter the receding groove and retreat from the positioning hole so as to allow the second connecting part to be detached from the first connecting part.

Description

Technical Field

[0001] The utility model relates to the field of fitness equipment, in particular to a quick-detachable pulley block and fitness equipment. Background Art

[0002] The fitness equipment is provided with a pulley block for guiding the pull rope, and some pulley blocks are detachably mounted on the frame, and the user can choose whether to install the pulley block according to the needs of the training movements.

[0003] A Chinese patent with publication number CN217502275U provides a detachable pulley block and fitness equipment. The detachable pulley block includes a fixed component, which includes a fixed frame and a rotating frame hinged to the fixed frame. Two pulleys are rotatably arranged on the rotating frame. A receiving groove is provided on the outer wall surface of the fixed frame away from the rotating frame. A first elastic member and a locking block are provided in the receiving groove. The lower part of the locking block is rotatably connected to the fixed frame. The first elastic member connects the fixed frame and the locking block to drive the upper part of the locking block to extend out of the receiving groove. A through hole connected to the receiving groove is provided on the fixed frame, and an unlocking member is slidably provided at the through hole. The unlocking member is used to drive the upper part of the locking block to retract back to the receiving groove. Limiting grooves connected to the bottom surface of the fixed frame are respectively provided on opposite sides.

[0004] The detachable pulley block also includes a mounting member, which includes a mounting portion and two L-shaped limit blocks relatively arranged on the mounting portion, one end of the L-shaped limit block away from the mounting portion cooperates with the limit groove, and the mounting portion is also provided with a lock hole that cooperates with the lock block.

[0005] When installing the fixing assembly on the mounting part, insert the limit block into the limit slot, and move the fixing assembly relative to the mounting part until the upper part of the locking block is aligned and enters the locking hole. When the fixing assembly needs to be removed, press the unlocking part to make the upper part of the locking block exit the locking hole, and move the fixing assembly relative to the mounting frame until the limit block exits the limit slot.

[0006] In the above solution, the locking block has a large rotation angle, and when the upper part of the locking block exits the lock hole, the entire locking block needs to be completely accommodated in the fixing frame, which places a high requirement on the thickness of the fixing frame and is not conducive to product miniaturization. In addition, the assembly of the rotatably connected locking block and the first elastic member on the fixing frame is relatively complicated. Utility Model Content

[0007] The utility model aims to provide a quick-release pulley block and fitness equipment, which are conducive to miniaturization of the quick-release pulley block and simplify the assembly process.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions.

[0009] The utility model provides a quick-release pulley block, which is used to be installed on a frame, and the frame is provided with a first connecting portion and a positioning hole. The quick-release pulley block includes:

[0010] A main body, provided with a pulley, a second connecting part and a back plate, wherein the second connecting part is used to detachably connect the first connecting part, and the back plate is provided with a through slot;

[0011] A positioning member, movably disposed in the through slot;

[0012] An operating member is movably connected to the main body and is disposed adjacent to the back plate. A clearance groove is disposed on a side of the operating member facing the back plate. The operating member has a locked state and an unlocked state.

[0013] In the locked state, the clearance groove is offset from the through groove, and the operating member abuts against the positioning member so that the positioning member extends out of the back plate to the side facing away from the operating member and into the positioning hole, so as to prevent the second connecting part from being removed from the first connecting part;

[0014] In the unlocked state, the clearance groove is aligned with the through groove, and the positioning member can enter the clearance groove and exit the positioning hole to allow the second connecting part to be removed from the first connecting part.

[0015] In some embodiments of the present application, the positioning member is spherical.

[0016] In some embodiments of the present application, the through slot includes a small end away from the operating member, and the small end is a position where the through slot has the smallest width;

[0017] The positioning member includes a large portion close to the operating member and a small portion far from the operating member, the large portion is the position where the positioning member has the largest width, and the small portion is the position where the positioning member has the smallest width;

[0018] The width of the large portion is greater than the width of the small end and smaller than the width of the remaining position of the through slot except the small end, and the width of the small portion is smaller than the width of the small end.

[0019] In some embodiments of the present application, the main body includes a fixing frame;

[0020] The fixing frame is provided with a mounting groove and the back plate is arranged adjacent to the mounting groove;

[0021] The operating member is movably arranged in the installation slot.

[0022] In some embodiments of the present application, the fixing frame is further provided with a guide groove extending along the moving direction of the operating member;

[0023] The operating member is provided with a guide portion, and the guide portion is movably inserted in the guide groove.

[0024] In some embodiments of the present application, the fixing frame is further provided with a panel adjacent to the mounting slot, and the panel and the back plate are disposed on opposite sides of the mounting slot;

[0025] The panel is provided with an access groove aligned with the through groove, and the width of the access groove is greater than the width of the positioning member.

[0026] In some embodiments of the present application, the distance between the panel and the back panel is smaller than the thickness of the positioning member.

[0027] In some embodiments of the present application, the quick-release pulley assembly further includes an elastic member;

[0028] The elastic member is arranged in the installation groove, and one end of the elastic member abuts against one end of the operating member;

[0029] The elastic force provided by the elastic member causes the other end of the operating member to extend out of the mounting slot, and the operating member can be moved from the unlocked state to the locked state, and the guide portion can abut against the end of the guide slot;

[0030] The quick-release pulley assembly also includes a fastener;

[0031] The fastener is threadedly connected to the mounting groove, and the other end of the elastic member abuts against the fastener.

[0032] In some embodiments of the present application, the first connecting portion includes a first slot and a second slot that are connected, and the width of the second slot is greater than the width of the first slot;

[0033] The second connecting portion includes a first connecting bar and a second connecting bar, one end of the first connecting bar is connected to the back plate, the other end of the first connecting bar is connected to the second connecting bar, and the width of the second connecting bar is greater than that of the first connecting bar;

[0034] The width of the second connecting strip is smaller than the width of the second slot and larger than the width of the first slot, and the width of the first connecting strip is smaller than the width of the first slot.

[0035] The utility model also provides a quick-release pulley block, comprising a frame and the quick-release pulley block described in any one of the above embodiments.

[0036] It can be seen from the above technical solutions that the embodiments of the utility model have at least the following advantages and positive effects:

[0037] In the quick-release pulley block of the embodiment of the utility model, when the quick-release pulley block needs to be installed on the frame, force is first applied to the operating member to move the operating member to the unlocked state, the second connecting part is aligned with the first connecting part, and then the operating member is released, the operating member rebounds to the locked state, and the positioning member extends into the positioning hole for positioning to prevent the second connecting part from being removed from the first connecting part.

[0038] When the quick-release pulley block needs to be removed from the frame, force is first applied to the operating member to move the operating member to the unlocked state, so that the positioning member can enter the clearance groove and exit the positioning hole to release the positioning and allow the second connecting part to be removed from the first connecting part.

[0039] By moving the operating member to switch between the locked state and the unlocked state, the quick-release pulley block can be quickly installed and removed, and the installation is more reliable. The moving stroke of the positioning member can meet the requirements of extending into or out of the positioning hole. The moving stroke of the positioning member is required to be short, and the thickness of the main body can be correspondingly smaller, which is conducive to product miniaturization. In addition, there is no rotating structure, which simplifies the assembly process of the quick-release pulley block. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0041] Figure 1 is a schematic structural diagram of a rack according to an exemplary embodiment.

[0042] Figure 2 It is a schematic structural diagram of a quick-release pulley block according to an exemplary embodiment.

[0043] Figure 3 yes Figure 2 Schematic diagram of the structure from another angle.

[0044] Figure 4 is a cross-sectional view showing an operating member in a quick-release pulley assembly in a locked state according to an exemplary embodiment.

[0045] Figure 5 is a cross-sectional view showing an operating member in a quick-release pulley assembly in an unlocked state according to an exemplary embodiment.

[0046] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure of area A in the middle.

[0047] Figure 7is a schematic structural diagram of a fixing bracket according to an exemplary embodiment.

[0048] Figure 8 is a schematic structural diagram of a positioning member, an operating member, an elastic member and a fastening member according to an exemplary embodiment.

[0049] The reference numerals in the accompanying drawings are explained as follows: 100, frame; 110, first connecting part; 1101, first slot; 1102, second slot; 120, positioning hole; 1, main body; 11, pulley; 12, second connecting part; 121, first connecting strip; 122, second connecting strip; 13, back plate; 131, through slot; 1311, small end; 1312, large end; 14, fixing frame; 141, mounting slot; 142, guide slot; 143, panel; 1431, access slot; 15, rotating frame; 2, positioning member; 21, large part; 22, small part; 3, operating member; 31, clearance slot; 32, guide part; 33, pressing part; 4, elastic member; 5, fastener. DETAILED DESCRIPTION

[0050] Although the present invention can be easily embodied as embodiments of different forms, only some of the specific embodiments are shown in the drawings and described in detail in this specification. It should be understood that this description should be regarded as an exemplary description of the principles of the present invention and is not intended to limit the present invention to that described herein.

[0051] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0052] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the utility model are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0053] See also Figures 1 to 6 The utility model provides a quick-release pulley block, which is used to be installed on a frame 100 , and the frame 100 is provided with a first connecting portion 110 and a positioning hole 120 .

[0054] The quick-release pulley block comprises a main body 1 , a positioning member 2 and an operating member 3 .

[0055] The main body 1 is provided with a pulley 11, a second connecting portion 12 and a back plate 13. The second connecting portion 12 is used to detachably connect to the first connecting portion 110. The back plate 13 is provided with a through slot 131. The positioning member 2 is movably arranged in the through slot 131. The operating member 3 is movably connected to the main body 1 and is adjacent to the back plate 13. The operating member 3 is provided with a clearance slot 31 on the side facing the back plate 13. The operating member 3 has a locked state and an unlocked state.

[0056] In the locked state, the positioning groove 31 is offset from the through groove 131 , and the operating member 3 abuts against the positioning member 2 so that the positioning member 2 extends out of the back plate 13 away from the operating member 3 and into the positioning hole 120 to prevent the second connecting portion 12 from being removed from the first connecting portion 110 .

[0057] In the unlocked state, the clearance groove 31 is aligned with the through groove 131 , and the positioning member 2 can enter the clearance groove 31 and exit the positioning hole 120 , so as to allow the second connecting portion 12 to be removed from the first connecting portion 110 .

[0058] With the above structural design, when the quick-release pulley block needs to be installed on the rack 100, force is first applied to the operating member 3 to move the operating member 3 to the unlocked state, and the second connecting portion 12 is aligned with the first connecting portion 110. Then, the operating member 3 is released, and the operating member 3 rebounds to the locked state. The positioning member 2 extends into the positioning hole 120 for positioning to prevent the second connecting portion 12 from being removed from the first connecting portion 110. Figure 4 shown.

[0059] When the quick-release pulley block needs to be removed from the frame 100, force is first applied to the operating member 3 to move the operating member 3 to the unlocked state, so that the positioning member 2 can enter the clearance groove 31 and exit the positioning hole 120 to release the positioning and allow the second connecting portion 12 to be removed from the first connecting portion 110. Figure 5 shown.

[0060] By switching the moving operating member 3 between the locked state and the unlocked state, the quick-release pulley block can be quickly installed and removed, and the installation is more reliable. The moving stroke of the positioning member 2 can be sufficient to extend into or exit the positioning hole 120. The moving stroke of the positioning member 2 is required to be short, and the thickness of the main body 1 can be correspondingly smaller, which is conducive to product miniaturization. In addition, there is no rotating structure, which simplifies the assembly process of the quick-release pulley block.

[0061] by Figure 3 The D1 direction shown is the width direction, and combined with Figure 1 and Figure 3The first connecting portion 110 includes a first slot 1101 and a second slot 1102 that are connected, and the width of the second slot 1102 is greater than the width of the first slot 1101. The second connecting portion 12 includes a first connecting bar 121 and a second connecting bar 122, one end of the first connecting bar 121 is connected to the back plate 13, and the other end of the first connecting bar 121 is connected to the second connecting bar 122, and the first connecting bar 121 and the second connecting bar 122 are L-shaped structures. The width of the second connecting bar 122 is greater than the width of the first connecting bar 121. The width of the second connecting bar 122 is less than the width of the second slot 1102 and greater than the width of the first slot 1101, and the width of the first connecting bar 121 is less than the width of the first slot 1101.

[0062] When the second connecting part 12 needs to be connected to the first connecting part 110, the second connecting strip 122 is passed through the second slot 1102 into the frame 100, and then the quick-release pulley block is moved to move the first connecting strip 121 to the first slot 1101. Because the width of the second connecting strip 122 is greater than that of the first slot 1101, the second connecting strip 122 will not fall out of the first slot 1101, and the second connecting strip 122 can be hung on the frame 100. At the same time, the operating member 3 is moved to the locked state, and the positioning member 2 can be extended into the positioning hole 120 for positioning.

[0063] When the second connecting part 12 needs to be removed from the first connecting part 110, the operating member 3 is moved to the unlocked state, the positioning member 2 withdraws from the positioning hole 120, and the quick-release pulley block is moved to move the first connecting strip 121 to the second slot 1102, so that the second connecting strip 122 can be removed from the second slot 1102.

[0064] The first connection parts 110 are symmetrically provided with two to form a first connection group, and the first connection groups are provided with multiple groups at intervals. The second connection parts 12 are symmetrically provided with two to form a second connection group, and the second connection groups are provided with multiple groups at intervals. The multiple groups of second connection groups are respectively used to detachably connect the multiple groups of first connection groups to improve the connection reliability.

[0065] The positioning member 2 is spherical. When the second connection part 12 is connected to the first connection part 110 or the second connection part 12 is removed from the first connection part 110, the quick-release pulley block needs to be moved, and the positioning member 2 extending out of the back plate 13 facing away from the operating member 3 will rub against the frame 100, and the spherical positioning member 2 can roll on the contact surface on the frame 100, reducing the friction resistance and facilitating the movement of the quick-release slide group.

[0066] See also Figure 6The through slot 131 includes a small end 1311 away from the operating member 3, and the small end 1311 is the position where the width of the through slot 131 is the smallest. The positioning member 2 includes a large portion 21 close to the operating member 3 and a small portion 22 away from the operating member 3, the large portion 21 is the position where the width of the positioning member 2 is the largest, and the small portion 22 is the position where the width of the positioning member 2 is the smallest. The width of the large portion 21 is greater than the width of the small end 1311 and less than the width of the remaining positions of the through slot 131 other than the small end 1311, and the width of the small portion 22 is less than the width of the small end 1311.

[0067] The small end 1311 allows the small portion 22 to pass through, so that the small portion 22 can extend out of the back plate 13 away from the operating member 3 and extend into the positioning hole 120, but prevents the large portion 21 from passing through the small end 1311, so that the positioning member 2 can be prevented from falling out from the small end 1311, and the other side of the positioning member 2 is provided with an operating member 3 to clamp the positioning member 2 in the through groove 131, so that the positioning member 2 has a moving space in the through groove 131 and will not fall out. On the spherical positioning member 2, the large portion 21 is a diameter position passing through the center of the positioning member 2, and the small portion 22 is an edge position away from the center of the positioning member 2.

[0068] The through slot 131 further includes a large end 1312 close to the operating member 3 . The width of the large end 1312 is greater than the width of the small end 1311 . The large end 1312 is the position where the through slot 131 has the largest width.

[0069] See also Figures 4 to 8 The main body 1 includes a fixing frame 14, the fixing frame 14 is provided with a mounting groove 141 and a back plate 13 adjacent to the mounting groove 141, and the operating member 3 is movably arranged in the mounting groove 141. The mounting groove 141 provides a mounting space for the operating member 3 and guides the movement of the operating member 3, ensuring that the positioning groove 31 of the operating member 3 can accurately align with the through groove 131 when the operating member 3 is in the unlocked state, so that the operating member 3 can switch between the locked state and the unlocked state more stably.

[0070] The fixing frame 14 is further provided with a panel 143 adjacent to the mounting groove 141, and the panel 143 and the back plate 13 are oppositely provided on both sides of the mounting groove 141. The panel 143 is provided with an access groove 1431 for aligning the through groove 131, and the width of the access groove 1431 is greater than the width of the positioning member 2.

[0071] The panel 143 is provided with a guide groove 142 extending along the moving direction of the operating member 3. The operating member 3 is provided with a guide portion 32, which is movably inserted into the guide groove. When the operating member 3 is in a locked state, the guide portion 32 abuts against one end of the guide groove 142 to form a limit to prevent the operating member 3 from escaping from the mounting groove 141. The movement of the operating member 3 is further guided more stably by the cooperation of the guide portion 32 and the guide groove 132. The guide portion 32 can be a screw and is threadedly connected to the operating member 3.

[0072] During the assembly of the quick-release pulley block, the positioning member 2 can be first pressed into the access groove 1431, and then the positioning member 2 is moved into the through groove 131 through the installation groove 141, and then the operating member 3 is inserted into the installation groove 141, which facilitates the installation of the positioning member 2.

[0073] The main body 1 further includes a rotating frame 15 , which is rotatably connected to the fixed frame 14 , and the rotating frame 15 is provided with a pulley 11 .

[0074] by Figure 4 The D2 direction shown is the thickness direction, and the thickness direction and the width direction are two directions perpendicular to each other in the horizontal cross section.

[0075] The distance between the panel 143 and the back panel 13 is less than the thickness of the positioning member 2. The distance between the panel 143 and the back panel 13 is recorded as the depth of the installation groove 141. When the positioning member 2 is pressed into the access groove 1431 and passes through the installation groove 141 and then enters the through groove 131, the positioning member 2 will not fall into the inside of the installation groove 141.

[0076] The quick-release pulley block also includes an elastic member 4, which is arranged in the installation groove 141. One end of the elastic member 4 abuts against one end of the operating member 3. The elastic force provided by the elastic member 4 causes the other end of the operating member 3 to extend out of the installation groove 141, and enables the operating member 3 to move from an unlocked state to a locked state. The guide portion 32 can abut against the end of the guide groove 142 to prevent the operating member 3 from escaping from the installation groove 141 due to excessive rebound travel.

[0077] By pressing the other end of the operating member 3 extending out of the mounting slot 141 to compress the elastic member 4, the operating member 3 can be moved from the locked state to the unlocked state. The elastic member 4 can be a spring. The other end of the operating member 3 extending out of the mounting slot 141 is also provided with a pressing portion 33, which improves the pressing feel.

[0078] The quick-release pulley block also includes a fastener 5. The fastener 5 is threadedly connected to the mounting groove 141, and the other end of the elastic member 4 abuts against the fastener 5. The threaded connection facilitates installation and removal of the fastener 5, and the movement stroke required for the operating member 3 to be pressed from the locked state to the unlocked state can be changed by adjusting the position of the fastener 5.

[0079] The utility model also provides a fitness equipment, which includes a frame 100 and a quick-release pulley assembly in any of the above embodiments. The beneficial effects of the fitness equipment can refer to the embodiments of the quick-release pulley assembly.

[0080] Although the utility model has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the utility model can be implemented in a variety of forms without departing from the spirit or essence of the utility model, it should be understood that the above-mentioned embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A quick-release pulley block, used for installation on a frame, wherein the frame is provided with a first connecting portion and a positioning hole, characterized in that: The quick-release pulley block comprises: A main body, provided with a pulley, a second connecting part and a back plate, wherein the second connecting part is used to detachably connect the first connecting part, and the back plate is provided with a through slot; A positioning member, movably disposed in the through slot; An operating member is movably connected to the main body and is disposed adjacent to the back plate. A clearance groove is disposed on a side of the operating member facing the back plate. The operating member has a locked state and an unlocked state. In the locked state, the clearance groove is offset from the through groove, and the operating member abuts against the positioning member so that the positioning member extends out of the back plate to the side facing away from the operating member and into the positioning hole, so as to prevent the second connecting part from being removed from the first connecting part; In the unlocked state, the clearance groove is aligned with the through groove, and the positioning member can enter the clearance groove and exit the positioning hole to allow the second connecting part to be removed from the first connecting part.

2. The quick-release pulley assembly according to claim 1, characterized in that: The positioning piece is spherical.

3. The quick-release pulley assembly according to claim 1, characterized in that: The through slot comprises a small end away from the operating member, and the small end is the position where the through slot has the smallest width; The positioning member includes a large portion close to the operating member and a small portion far from the operating member, the large portion is the position where the positioning member has the largest width, and the small portion is the position where the positioning member has the smallest width; The width of the large portion is greater than the width of the small end and smaller than the width of the remaining position of the through slot except the small end, and the width of the small portion is smaller than the width of the small end.

4. The quick-release pulley assembly according to claim 1, characterized in that: The main body includes a fixing frame; The fixing frame is provided with a mounting groove and the back plate is arranged adjacent to the mounting groove; The operating member is movably arranged in the installation slot.

5. The quick-release pulley assembly according to claim 4, characterized in that: The fixing frame is also provided with a guide groove extending along the moving direction of the operating member; The operating member is provided with a guide portion, and the guide portion is movably inserted in the guide groove.

6. The quick-release pulley assembly according to claim 4, characterized in that: The fixing frame is further provided with a panel adjacent to the mounting groove, and the panel and the back plate are arranged on two sides of the mounting groove opposite to each other; The panel is provided with an access groove aligned with the through groove, and the width of the access groove is greater than the width of the positioning member.

7. The quick-release pulley assembly according to claim 6, characterized in that: The distance between the front panel and the back panel is smaller than the thickness of the positioning member.

8. The quick-release pulley assembly according to claim 5, characterized in that: The quick-release pulley assembly further includes an elastic member; The elastic member is arranged in the installation groove, and one end of the elastic member abuts against one end of the operating member; The elastic force provided by the elastic member causes the other end of the operating member to extend out of the mounting slot, and the operating member can be moved from the unlocked state to the locked state, and the guide portion can abut against the end of the guide slot; The quick-release pulley assembly also includes a fastener; The fastener is threadedly connected to the mounting groove, and the other end of the elastic member abuts against the fastener.

9. The quick-release pulley assembly according to claim 1, characterized in that: The first connecting portion includes a first slot and a second slot that are connected, and the width of the second slot is greater than the width of the first slot; The second connecting portion includes a first connecting bar and a second connecting bar, one end of the first connecting bar is connected to the back plate, the other end of the first connecting bar is connected to the second connecting bar, and the width of the second connecting bar is greater than that of the first connecting bar; The width of the second connecting strip is smaller than the width of the second slot and larger than the width of the first slot, and the width of the first connecting strip is smaller than the width of the first slot.

10. A fitness equipment, characterized in that: It comprises a frame and the quick-release pulley block according to any one of claims 1 to 9.

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