A lockable hand-crank mechanism

Abstract

A lockable hand-crank mechanism is installed on a transmission plate assembly. A sprocket and a sleeve coaxially fixed with the sprocket are provided on the transmission plate assembly. A rotating shaft is provided inside the sleeve. A tooth groove is provided at the end of the sleeve away from the sprocket. A clutch drive assembly is also provided. The sleeve is engaged or disengaged with the clutch drive assembly through the tooth groove to control the on and off of power transmission to the sprocket. The present invention abandons the traditional separate setting of power output and braking, and integrates power output and braking into an integrated structure, so that the overall structure has high integration and small space occupation. In terms of use effect, only the hand crank handle needs to be controlled to realize power output and state conversion, which is particularly suitable for the lifting and lowering operation of compact shelving.

Description

Technical Field

[0001] The invention relates to the field of hand-crank mechanisms, and in particular to a lockable hand-crank mechanism. Background Art

[0002] The hand-cranked mechanism of the existing compact shelving bookshelves has always adopted the traditional chain transmission structure. The transmission structure characteristics of this traditional chain transmission device determine its relatively low transmission efficiency and weak power transmission. In addition, it is easy for the chain to come off during operation, the transmission noise is loud, and the chain is prone to jumping and breaking, which affects the normal use of the compact shelving. Most importantly, the current hand-cranked mechanism can only achieve synchronous movement, and the input and output are strictly corresponding. When there is input, there is output. It is impossible to maintain a no-output state in the event of unexpected power input. Summary of the invention

[0003] According to the problems raised in the background technology, the present invention provides a multifunctional hand-cranked mechanism for compact shelving to solve the problems. The present invention will be further described below.

[0004] A lockable hand-crank mechanism is installed on a transmission plate assembly, a sprocket and a shaft sleeve coaxially fixed with the sprocket are arranged on the transmission plate assembly, a rotating shaft is arranged inside the shaft sleeve, and a tooth groove is arranged at the end of the shaft sleeve away from the sprocket; it is characterized in that it also includes a clutch drive assembly, and the clutch drive assembly includes: a fixed plate, fixedly connected to the end of the rotating shaft, and a limiting groove is arranged on the plate; a rocker arm, including a barrel and an arm connected together, a barrel shaft sleeved on the rotating shaft is arranged inside the barrel, and the barrel and the arm are set as open surfaces on different sides and And it is internally connected, the movable block includes a circular part and a rectangular part connected as one, a hole groove is arranged in the middle of the circular part, the top of the hole groove is connected to a limited edge, and the limited edge can cooperate with the limited groove; the cylinder shaft is located in the hole groove, the circular part is located in the cylinder part, the rectangular part is located in the arm part, and a movable groove is arranged on the rectangular part; the lock and the rotating tongue are movably arranged on both sides of the rectangular part, the lock is connected to the rotating tongue and rotates synchronously, and the rotating tongue contacts the side wall of the movable groove; the movable hook is fixed on the circular part, and the movable hook and the circular part are respectively located on both sides of the circular part.

[0005] Preferably, the rectangular portion of the movable block fits against the inner wall of the arm of the rocker arm, and the side wall of the arm guides the movement of the movable block; the movable block is maintained to move in the axial direction of the rocker arm to avoid lateral movement of the movable block, thereby avoiding mechanical collision between the limit edge and the limit groove.

[0006] Preferably, there is a gap between the rectangular portion of the movable block and the inner wall of the arm of the rocker arm; a guide column is provided on the circular portion, a slide groove is provided on the cylinder portion, the guide column is located in the slide groove, and the slide groove guides the guide column; the accuracy of the limit edge and the limit groove is ensured.

[0007] As a preferred embodiment, when the limiting edge cooperates with the limiting groove, the guide clamping column also cooperates in the tooth groove of the sleeve, and the guide clamping column contacts the side of the tooth groove; in the event of accidental touch from the outside, the guide clamping column and the tooth groove ensure the stress strength; at the same time, the guide clamping column has a position correction effect on the tooth groove, ensuring the position accuracy of the movable hook and the tooth groove.

[0008] Preferably, when the movable block moves, one of the movable hook and the guide clamping column always contacts the tooth groove; and one of the movable hook and the guide clamping column always limits the rotational freedom of the sleeve.

[0009] Preferably, the guide column is made of a brittle material. When the guide column is still in the engagement state with the tooth groove for power output, the guide column is broken. At this time, due to the engagement state between the limit edge and the limit groove, the external force will drive the shaft to rotate, and power output cannot be achieved.

[0010] Preferably, the lock is a component with a password lock structure, and the operating authority of the rocker arm is set to ensure safety.

[0011] Preferably, a tension spring is also included, one end of which is connected to the movable block, and the other end is connected to the inner wall of the rocker arm. The tension spring always exerts a pulling force on the movable block; the tension of the tension spring prevents the locking state from being mistakenly transferred to the power state.

[0012] Preferably, a handle is also pivotally connected to the rocker arm.

[0013] Preferably, the open surface of the cylinder portion of the rocker arm is sealed by being connected to a cover.

[0014] Beneficial effect: Compared with the hand-cranked structure of the prior art, the present invention abandons the traditional separate setting of power output and braking, and integrates power output and braking into an integrated structure, so that the overall structure has high integration and small space occupancy. In terms of use effect, it is only necessary to control the hand crank to achieve power output and state conversion, which is particularly suitable for the lifting operation of compact shelving. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 : Exploded schematic diagram of the present invention and assembly;

[0016] Figure 2 : Schematic diagram of the structure of the rocker arm and the movable block;

[0017] Figure 3 : Schematic diagram of the structure of the clutch drive assembly;

[0018] Figure 4 : A schematic diagram of the axle side of the dynamic state;

[0019] Figure 4a: Another axial schematic diagram of the dynamic state;

[0020] Figure 5 : A schematic diagram of the shaft side in the self-locking state;

[0021] Figure 5a : Schematic diagram of another axis side in self-locking state;

[0022] In the figure: cover 1, handle 2, lock 3, hexagonal screw 4, fixing plate 5, limiting groove 51, rocker arm 6, barrel 61, arm 62, barrel shaft 63, slide groove 64, movable block 7, circular portion 71, rectangular portion 72, hole groove 73, movable groove 74, limiting edge 75, guide clamping column 76, tension spring 8, semicircular head screw 9, rotating tongue 10, bearing 11, movable hook 12, countersunk bolt 13, rotating shaft 14, bushing 15, tooth groove 151, sprocket 16, transmission plate bearing 17. DETAILED DESCRIPTION

[0023] Next, a specific embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0024] A lockable hand-crank mechanism is installed on a transmission plate assembly 17. A sprocket 16 and a sleeve 15 coaxially fixed with the sprocket are provided on the transmission plate assembly 17. A rotating shaft 14 is provided inside the sleeve 15. A bearing is sleeved on the end of the rotating shaft 14 away from the sprocket. A tooth groove 151 is provided on the end of the sleeve 15 away from the sprocket 16 and sleeved on the bearing; the sleeve 15 is engaged or disengaged with the clutch drive assembly through the tooth groove 151, thereby controlling the on and off of power transmission to the sprocket 16.

[0025] The clutch drive assembly includes a lock 3, an external hexagonal screw 4, a fixed plate 5, a rocker arm 6, a movable block 7, a rotating tongue 10, a bearing 11, a movable hook 12, and a countersunk bolt 13; the rocker arm 6 includes a barrel 61 and an arm 62 connected in one body, a raised barrel shaft 63 is provided inside the barrel 61, the barrel shaft 63 is sleeved on the rotating shaft 14, and the end of the rotating shaft 14 is fastened by the surface contact of the fixed plate 5 with the rotating shaft 14 through the cooperation with the external hexagonal screw 4, the barrel 61 and the arm 62 of the rocker arm 6 are set as open surfaces on different sides and are connected inside, so as to facilitate the installation of the movable block 7; the movable block 7 includes a circular portion 71 and a rectangular portion 72 connected in one body, a hole groove 73 is provided in the middle of the circular portion 71, and a hole groove 73 is provided in the installation When installed, the barrel shaft 63 is located in the hole groove 73, the circular part 71 is located in the barrel part 61, and the rectangular part 72 is located in the arm part 62. A movable groove 74 is provided on the rectangular part 72. The lock 3 and the rotating tongue 10 are connected and movably arranged on both sides of the rectangular part 72. The lock 3 and the rotating tongue 10 rotate synchronously, and the rotating tongue 10 contacts the side wall of the movable groove 74; the top of the hole groove 73 is connected to the limited edge 75, and the fixed plate 5 is provided with a limited groove 51, and the limited edge 75 can cooperate with the limited groove 51; the circular part 71 and the barrel part 61 are provided with installation grooves, and the movable hook 12 is fixedly connected to the circular part 71 at the installation groove by a countersunk bolt 13, and the movable hook 12 and the circular part 71 are respectively located on both sides of the circular part 71.

[0026] The clutch drive assembly controls the on-off transmission of power to the sprocket 16 by the engagement or disengagement of the movable hook 12 with the tooth groove 151, that is, the hand-crank mechanism of the present invention has two mutually convertible states: one is the power state, see the attached Figure 4 and 4a , the limiting edge 75 is disengaged from the limiting groove 51, the movable hook 12 is matched with the tooth groove 151, at this time, based on the matching state of the movable hook 12 and the tooth groove 151, the rocker arm 6 and the sprocket 16 form a power transmission path, and the rocker arm 6 transmits torque to the sprocket 16; the other is the locked state, refer to the attached Figure 5 and 5a , the limiting edge 75 cooperates with the limiting groove 51, and the movable hook 12 is disengaged from the tooth groove 151. At this time, the rocker arm 6 and the sprocket 16 cannot form a power transmission path, and the rocker arm 6 cannot transmit torque to the sprocket 16.

[0027] The two states of the present invention can be converted by rotating the lock 3: from the locked state to the power state, the lock 3 is rotated clockwise, and the lock 3 drives the cam-shaped tongue 10 to rotate synchronously. The tongue 10 pushes the movable block 7 to move upward when rotating. At this time, the limiting edge 75 of the movable block 7 is disengaged from the limiting groove 51 of the fixed plate 5. When the lock 3 is rotated into place, the movable hook 12 moves upward and is stuck in the tooth groove 151, and cooperates with the tooth groove 151, that is, it enters the power state; from the power state to the locked state, the lock 3 is rotated in the opposite direction.

[0028] In one embodiment, the rectangular portion 72 of the movable block 7 is fitted with the inner wall of the arm 62 of the rocker arm 6, and the side wall of the arm 62 has a guiding effect on the movement of the movable block 7, so as to maintain the movable block 7 moving in the axial direction of the rocker arm 6, avoid the lateral movement of the movable block 7, and thus avoid the mechanical collision between the limiting edge 75 and the limiting groove 51. However, in this embodiment, the rectangular portion 72 is fitted with the inner wall of the arm 62, which has strict requirements on the external environment and is prone to jamming. Based on this situation, this embodiment is a preferred embodiment, and there is a gap between the rectangular portion 72 of the movable block 7 and the inner wall of the arm 62 of the rocker arm 6. A guide clamping column 76 is also provided on the circular portion 71 of the movable block 7, and a slide groove 64 is provided on the cylinder 61 of the rocker arm 6. The guide clamping column 76 is located in the slide groove 64, and the slide groove 64 has a guiding effect on the guide clamping column 76, so as to ensure the accuracy of the matching between the limiting edge 75 and the limiting groove 51.

[0029] Furthermore, in the locked state, the limiting edge 75 cooperates with the limiting groove 51, and the limiting edge 75 and the fixing plate 5 are limited by space layout and cost. When the rocker arm 6 is subjected to external erroneous operation, its strength is not enough to maintain it from deformation. In view of this, in the present embodiment, when the limiting edge 75 cooperates with the limiting groove 51, the guide clamping column 76 is also cooperated in the tooth groove 151 of the sleeve 15, and the guide clamping column 76 contacts the side of the tooth groove 151. In the case of external accidental touch, the guide clamping column 76 and the tooth groove 151 ensure the stress strength.

[0030] It should also be noted that the shaft sleeve 15 has rotational freedom. When the locking state is converted into the power state, there is a risk that the movable hook 12 cannot be stuck in the tooth groove 151 when moving upward. In view of the fact that the guide clamping column 76 is previously engaged in the tooth groove 151 of the shaft sleeve 15, that is, the guide clamping column 76 has a position correction effect on the tooth groove 151, thereby ensuring that the movable hook 12 and the tooth groove 151 are relative to each other. Optimally, the size setting of the movable hook 12 and the guide clamping column 76 of this embodiment satisfies that when the movable block 7 moves, one of the movable hook 12 and the guide clamping column 76 is always in contact with the tooth groove 151, that is, when the state is changed, there is always a component of the movable hook 12 and the guide clamping column 76 that limits the rotational freedom of the shaft sleeve 15.

[0031] The problem that needs to be solved is that, in the locked state, in order to ensure that there is no external interference when the limiting edge 75 and the limiting groove 51 are matched, the guide clamping column 76 is set in contact with the side of the tooth groove 151. At this time, if the rocker arm is rotated without being converted to the power state, the guide clamping column 76 will also rotate through the matching shaft sleeve 15 with the tooth groove 151, thereby realizing power output. To avoid this situation, the guide clamping column 76 in this embodiment is made of brittle material. When power output is mistakenly realized in the locked state, the guide clamping column 76 made of brittle material will be broken due to the large power output load. At this time, based on the matching state of the limiting edge 75 and the limiting groove 51, external force will drive the shaft to rotate, and power output cannot be realized.

[0032] In this embodiment, in order to ensure the safety of the device, the operating authority of the rocker arm 6 is set, and the lock 3 is a component with a password lock structure. The lock with a password lock function is a conventional prior art and will not be further elaborated in this embodiment.

[0033] During the rotation of the rocker arm 6, its stopping position is random, that is, the movable block 7 will be displaced under its own weight without the action of external force, so that the mechanism will mistakenly enter the dynamic state from the locked state. To avoid this situation, the present embodiment is also provided with a tension spring 8, one end of the tension spring 8 is connected to the semi-circular head screw 9 located on the movable block 7, and the other end is connected to the inner wall of the rocker arm 6. The tension spring 8 always has a pulling force on the movable block 7, that is, unless the rotary lock 3 is manually connected, the tension of the tension spring 8 prevents the locked state from mistakenly entering the dynamic state.

[0034] In order to improve the operating feel, a handle 2 is pivotally connected to the rocker arm 6 in this embodiment.

[0035] The open surface of the cylinder portion 61 of the rocker arm 6 of this embodiment is sealed by being connected to the cover 1 .

[0036] In order to maintain the stability of the contact between the rotating tongue 10 and the side wall of the movable groove 74, a contact rod is provided on the rotating tongue 10, and the raised contact rod ensures that the rotating tongue 10 is always in contact with the side wall of the movable groove 74.

[0037] The present invention has a high degree of integration and can realize the conversion of power and locking state only by controlling the hand crank, and is particularly suitable for the lifting operation of compact shelving.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lockable hand-crank mechanism, mounted on a transmission plate assembly (17), the transmission plate assembly (17) being provided with a sprocket (16) and a shaft sleeve (15) coaxially fixed with the sprocket, a rotating shaft (14) being provided inside the shaft sleeve (15), and a tooth groove (151) being provided at an end of the shaft sleeve (15) away from the sprocket (16); characterized in that Also included is a clutch drive assembly, the clutch drive assembly comprising: A fixed plate (5) fixedly connected to the end of the rotating shaft (14) and having a limiting groove (51) disposed thereon; The rocker arm (6) comprises a barrel portion (61) and an arm portion (62) connected together. A barrel shaft (63) sleeved on a rotating shaft (14) is arranged inside the barrel portion (61). The barrel portion (61) and the arm portion (62) are arranged to be open faces on different sides and are internally connected. The movable block (7) comprises a circular portion (71) and a rectangular portion (72) connected in one piece, a hole-digging groove (73) being arranged in the middle of the circular portion (71), a limiting edge (75) being connected to the top of the hole-digging groove (73), and the limiting edge (75) being capable of cooperating with the limiting groove (51); the cylindrical shaft (63) is located in the hole-digging groove (73), the circular portion (71) is located in the cylindrical portion (61), the rectangular portion (72) is located in the arm portion (62), and a movable groove (74) is arranged on the rectangular portion (72); The lock (3) and the rotating tongue (10) are movably arranged on both sides of the rectangular portion (72); the lock (3) and the rotating tongue (10) are connected and rotate synchronously; and the rotating tongue (10) contacts the side wall of the movable groove (74); The movable hook (12) is fixed on the circular portion (71), and the movable hook (12) and the circular portion (71) are respectively located on two sides of the circular portion (71).

2. The hand-crank mechanism according to claim 1, characterized in that: The rectangular portion (72) of the movable block (7) fits against the inner wall of the arm portion (62) of the rocker arm (6), and the side wall of the arm portion (62) guides the movement of the movable block (7); the movable block (7) is maintained to move in the axial direction of the rocker arm (6), thereby preventing the movable block (7) from shifting sideways, thereby preventing the limiting edge (75) from mechanically impacting the limiting groove (51).

3. The hand-crank mechanism according to claim 1, characterized in that: There is a gap between the rectangular portion (72) of the movable block (7) and the inner wall of the arm portion (62) of the rocker arm (6); A guide clamping column (76) is provided on the circular portion (71), a slide groove (64) is provided on the cylindrical portion (61), the guide clamping column (76) is located in the slide groove (64), and the slide groove (64) guides the guide clamping column (76).

4. The hand-crank mechanism according to claim 3, characterized in that: When the limiting edge (75) is matched with the limiting groove (51), the guide clamping column (76) is also matched in the tooth groove (151) of the shaft sleeve (15), and the guide clamping column (76) is in contact with the side surface of the tooth groove (151).

5. The hand-crank mechanism according to claim 4, characterized in that: When the movable block (7) moves, one of the movable hook (12) and the guide clamping column (76) is always in contact with the tooth groove (151).

6. The hand-crank mechanism according to claim 5, characterized in that: The guide clamping column (76) is made of a brittle material; When the guide clamping column (76) is still engaged in the tooth groove (151) to output power, the guide clamping column (76) is broken.

7. The hand-crank mechanism according to claim 1, characterized in that: The lock (3) is a component with a password lock structure.

8. The hand crank mechanism according to any one of claims 1 to 7, characterized in that: It also includes a tension spring (8), one end of which is connected to the movable block (7), and the other end of which is connected to the inner wall of the rocker arm (6). The tension spring (8) always exerts a pulling force on the movable block (7).

9. The hand-crank mechanism according to claim 8, characterized in that: A handle (2) is also pivotally connected to the rocker arm (6).

10. The hand-crank mechanism according to claim 9, characterized in that: The open surface of the cylindrical portion (61) of the rocker arm (6) is sealed by being connected to a sealing cover (1).

Images