Telescopic frame locking structure

Abstract

A telescopic frame locking structure is characterized in that the locking structure comprises two locking assemblies which are symmetrically arranged on the inner sides of fixing rods of a left vertical rod and a right vertical rod in a left-right mode; the locking assembly comprises a fixing block, a locking pin and a spring, the fixing block is fixed to the inner side of the fixing rod of the left vertical rod and the inner side of the fixing rod of the right vertical rod, a penetrating hole is formed in the fixing block in the transverse direction, the locking pin penetrates into the penetrating hole, the spring acts on the locking pin, and the outer end of the locking pin is forced to penetrate into the hole in the fixing rod through the elastic force of the spring; the positioning holes in the telescopic rod penetrate into the positioning holes in a matched mode; the inner ends of the locking pins are bent in the radial direction to form radial bent sections and then extend in the axial direction, the radial bent sections are matched with the end faces of the fixing blocks in an abutting mode, the inner ends of the locking pins of the two locking assemblies are connected through a sleeve, and the inner ends of the locking pins can slide in the axial direction relative to the sleeve.

Description

Technical Field

[0001] The utility model relates to a cart or a ladder frame, in particular to a telescopic frame locking structure used on the cart or the ladder frame. Background Art

[0002] Trolleys are widely used as handling tools in logistics, express delivery, warehousing and other fields. They are widely welcomed for their simplicity, convenience, low cost and high efficiency. Modern trolleys also need to have telescopic and folding functions, reduce the size and facilitate storage to meet consumers' demand for convenience.

[0003] A representative cart is the utility model with authorization announcement number CN201825071U, which is composed of a pull rod, a bracket and a bottom plate. The bottom side of the bracket is provided with wheels, and the other side is provided with a bottom plate. The top of the bracket is provided with the pull rod facing upward, and the pull rod is composed of a left vertical pole, a right vertical pole, a cross bar connected between the middle of the left vertical pole and the right vertical pole, and a handle connected between the top of the left vertical pole and the right vertical pole. The left vertical pole and the right vertical pole can adopt telescopic rods to achieve the telescopic function. Since a telescopic rod is adopted, a telescopic locking structure needs to be provided. The locking structures currently available on the market are either too complicated in structure and high in cost, or their load-bearing capacity is insufficient and the locking is not reliable enough. Summary of the invention

[0004] The utility model aims to provide a telescopic frame locking structure, which has a simple structure, low cost, good load-bearing capacity after locking and high reliability.

[0005] To achieve the above object, the technical solution adopted by the utility model is: a telescopic frame locking structure, the telescopic frame has a left upright rod and a right upright rod, the left upright rod and the right upright rod are both composed of a fixed rod and a telescopic rod nested, and the telescopic rod is provided with a plurality of positioning holes;

[0006] The locking structure comprises two locking components, which are symmetrically arranged on the inner sides of the fixing rods of the left and right uprights, one on the left and the other on the right; the locking component comprises a fixing block, a locking pin and a spring, the fixing block is fixed to the inner sides of the fixing rods of the left and right uprights, a through hole is arranged transversely on the upper edge of the fixing block, the locking pin is inserted into the through hole, the spring acts on the locking pin, and the elastic force of the spring forces the outer end of the locking pin to penetrate into the hole on the fixing rod so as to be inserted and matched with the positioning hole on the telescopic rod; the inner end of the locking pin is first radially bent to form a radial bending section and then extends axially, the radial bending section abuts and cooperates with the end face of the fixing block, the inner ends of the locking pins of the two locking components are connected by a sleeve, and the inner end of the locking pin can slide axially relative to the sleeve;

[0007] Specifically, an action curved surface is circumferentially provided on the end surface of the fixed block that abuts against the radial bending section, and a first position point and a second position point are provided on the action curved surface; when the radial bending section of the locking pin abuts against the first position point, the outer end of the locking pin penetrates into the hole on the fixed rod due to the elastic force of the spring, so as to be inserted and matched with the positioning hole on the telescopic rod to achieve a locked state, and when the radial bending section of the locking pin abuts against the second position point, the locking pin overcomes the spring force and withdraws to reach an unlocked state.

[0008] In the above scheme, the through hole of the fixing block is a stepped hole, and its large hole section is installed toward the fixing rod, the length of the large hole section is greater than that of the small hole section, and the spring is arranged in the large hole section, and the spring is a compression spring, the inner end of which abuts against the step surface of the stepped hole, and the outer end of which is positioned on the pin body of the locking pin through a clamping piece.

[0009] Furthermore, the fixing block is fixed on the inner surface of the fixing rod by rivets.

[0010] In the above scheme, a first position point and two second position points are provided on the action curved surface; the two second position points are respectively provided at the upper and lower parts, and the first position point is located in the middle, so that when the sleeve is moved, when the sleeve is at the highest position, the radial bending section of the locking pin abuts against the second position point above to achieve an unlocked state, when the sleeve is at the middle position, the radial bending section of the locking pin abuts against the first position point to achieve a locked state, and when the sleeve is at the lowest position, the radial bending section of the locking pin abuts against the second position point below to achieve an unlocked state.

[0011] In the above scheme, when the radial bending section of the locking pin abuts against the first position point, the outer end of the locking pin penetrates the fixing rod and the telescopic rod due to the elastic force of the spring, so that the outer end is exposed on the outer side of the fixing rod to achieve a locked state.

[0012] The effects of the utility model are:

[0013] 1. Since the utility model achieves the conversion between unlocking and locking by abutting the radial bending section of the locking pin against the end surface of the fixing block, the locking components on both sides can be unlocked at the same time by pushing the sleeve upward or downward, which is more in line with ergonomics and the arm exerts force, making the operation smoother;

[0014] 2. Also, since the utility model achieves unlocking and locking conversion by abutting and matching the radial bending section of the locking pin with the end face of the fixing block, the fixing block is similar to a cam, and has high locking reliability and good load-bearing capacity;

[0015] 3. Also, because the present invention achieves the conversion between unlocking and locking by the abutment and cooperation between the radial bending section of the locking pin and the end surface of the fixing block, the overall structure is relatively simple and the implementation cost is not high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the first embodiment of the utility model applied to a cart;

[0017] Figure 2 This is a structural cross-sectional view of the first embodiment of the utility model;

[0018] Figure 3 It is a three-dimensional schematic diagram of the fixing block structure of the first embodiment of the utility model;

[0019] Figure 4 This is a partial exploded schematic diagram of the first embodiment of the utility model applied to a cart.

[0020] In the above picture:

[0021] 1. Telescopic frame; 2. Left vertical pole; 3. Right vertical pole; 4. Fixed pole; 5. Telescopic pole; 6. Bending pole;

[0022] 7. Locking assembly;

[0023] 71, fixed block; 711, perforation; 712, action curved surface; 7121, first position point; 7122, second position point;

[0024] 72. locking pin; 721. radial bending section;

[0025] 73. Spring;

[0026] 74. Card firmware;

[0027] 75. Rivets;

[0028] 8. Casing. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0030] Example 1: See Figure 1-4 As shown, a telescopic frame locking structure:

[0031] The telescopic frame 1 is applied to a cart, such as Figure 1 As shown, the telescopic frame 1 has a left upright pole 2 and a right upright pole 3, and the left upright pole 2 and the right upright pole 3 are both composed of a fixed rod 4 and a telescopic rod 5 nested together, and the telescopic rod 5 is provided with multiple positioning holes. Specifically, the top ends of the left upright pole 2 and the right upright pole 3 are connected by a bent rod 6.

[0032] The locking structure comprises two locking components 7 , which are symmetrically arranged on the inner sides of the fixing rods 4 of the left upright rod 2 and the right upright rod 3 , one on the left and one on the right.

[0033] The locking assembly 7 includes a fixing block 71, a locking pin 72 and a spring 73. The fixing block 71 is fixed to the inner side of the fixing rod 4 of the left upright rod 2 and the right upright rod 3. A through hole 711 is arranged on the upper side of the fixing block 71 in the transverse direction. The locking pin 72 is inserted into the through hole 711. The spring 73 acts on the locking pin 72. The elastic force of the spring 73 forces the outer end of the locking pin 72 to penetrate the hole on the fixing rod 4 so as to be inserted into and matched with the positioning hole on the telescopic rod 5. The inner end of the locking pin 72 is first radially bent to form a radial bending section 721 and then extends axially. The radial bending section 721 is abutted against and matched with the end face of the fixing block 71. The inner ends of the locking pins 72 of the two locking assemblies 7 are connected through a sleeve 8. The inner end of the locking pin 72 can slide axially relative to the sleeve 8.

[0034] Specifically, an action curved surface 712 is circumferentially provided on the end surface of the fixing block 71 that abuts against the radial bending section 721, and a first position point 7121 and a second position point 7122 are provided on the action curved surface 712. When in use, the sleeve 8 is moved up and down, and when the radial bending section 721 of the locking pin 72 abuts against the first position point 7121, the outer end of the locking pin 72 penetrates into the hole on the fixing rod 4 due to the elastic force of the spring 73, so as to be inserted and matched with the positioning hole on the telescopic rod 5 to achieve a locked state, and when the radial bending section 721 of the locking pin 72 abuts against the second position point 7122, the locking pin 72 overcomes the spring force and withdraws to achieve an unlocked state.

[0035] The through hole of the fixing block 71 is a stepped hole, and its large hole section is installed toward the fixing rod, and the length of the large hole section is greater than that of the small hole section. The spring 73 is arranged in the large hole section, and the spring 73 is a compression spring, the inner end of which abuts against the step surface of the stepped hole, and the outer end of which is positioned on the pin body of the locking pin 72 through the clamping piece 74. The fixing block 71 is fixed to the inner surface of the fixing rod 4 by a rivet 75.

[0036] See also Figure 3 As shown, a first position point 7121 and two second position points 7122 are provided on the action curved surface 712; the two second position points 7122 are provided at the upper and lower parts, and the first position point 7121 is provided in the middle, so that when the sleeve 8 is moved, when the sleeve 8 is at the highest position, the radial bending section 721 of the locking pin 72 abuts against the second position point 7122 at the upper part to achieve the unlocking state, when the sleeve 8 is at the middle position, the radial bending section 721 of the locking pin 72 abuts against the first position point 7121 to achieve the locking state, and when the sleeve 8 is at the lowest position, the radial bending section 721 of the locking pin 72 abuts against the second position point 7122 at the lower part to achieve the unlocking state. Such a design is most convenient to operate, and can be unlocked by dialing upward or downward according to the user's habit.

[0037] Specifically, when the radial bending section 721 of the locking pin 72 is against the first position point 7121, the outer end of the locking pin 72 penetrates the fixed rod 4 and the telescopic rod 5 due to the elastic force of the spring 73, so that the outer end is exposed on the outer side of the fixed rod 4 to achieve a locked state. Such a design has the best load-bearing capacity.

[0038] When the present embodiment is used, the locking components 7 on both sides can be unlocked simultaneously by pushing the sleeve 8 upward or downward, which is more ergonomic and allows the arm to exert force, making the operation smoother. Furthermore, the fixing block 71 is similar to a cam, has high locking reliability, good load-bearing capacity, a relatively simple overall structure, and a low implementation cost.

[0039] Embodiment 2: A telescopic frame locking structure:

[0040] The locking structure of the telescopic frame of this embodiment is the same as that of the first embodiment, but is different from the first embodiment in that it is applied to a telescopic ladder to lock and unlock the telescopic column of the ladder.

[0041] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A telescopic frame locking structure, the telescopic frame having a left upright pole and a right upright pole, both of which are composed of a fixed pole and a telescopic pole nested together, and the telescopic pole is provided with a plurality of positioning holes; characterized in that: The locking structure comprises two locking components, which are symmetrically arranged on the inner sides of the fixing rods of the left and right uprights, one on the left and the other on the right; the locking component comprises a fixing block, a locking pin and a spring, the fixing block is fixed to the inner sides of the fixing rods of the left and right uprights, a through hole is arranged transversely on the upper edge of the fixing block, the locking pin is inserted into the through hole, the spring acts on the locking pin, and the elastic force of the spring forces the outer end of the locking pin to penetrate into the hole on the fixing rod so as to be inserted and matched with the positioning hole on the telescopic rod; the inner end of the locking pin is first radially bent to form a radial bending section and then extends axially, the radial bending section abuts and cooperates with the end face of the fixing block, the inner ends of the locking pins of the two locking components are connected by a sleeve, and the inner end of the locking pin can slide axially relative to the sleeve; Specifically, an action curved surface is circumferentially provided on the end surface of the fixed block that abuts against the radial bending section, and a first position point and a second position point are provided on the action curved surface; when the radial bending section of the locking pin abuts against the first position point, the outer end of the locking pin penetrates into the hole on the fixed rod due to the elastic force of the spring, so as to be inserted and matched with the positioning hole on the telescopic rod to achieve a locked state, and when the radial bending section of the locking pin abuts against the second position point, the locking pin overcomes the spring force and withdraws to reach an unlocked state.

2. The telescopic frame locking structure according to claim 1, characterized in that: The through hole of the fixing block is a stepped hole, and its large hole section is installed toward the fixing rod. The length of the large hole section is greater than that of the small hole section. The spring is arranged in the large hole section, and the spring is a compression spring. Its inner end abuts against the step surface of the stepped hole, and its outer end is positioned on the pin body of the locking pin through a clamping piece.

3. The telescopic frame locking structure according to claim 2, characterized in that: The fixing block is fixed on the inner side surface of the fixing rod by rivets.

4. The telescopic frame locking structure according to claim 1, characterized in that: A first position point and two second position points are provided on the action curved surface; the two second position points are respectively provided at the upper and lower parts, and the first position point is located in the middle, so that when the sleeve is moved, when the sleeve is at the highest position, the radial bending section of the locking pin abuts against the second position point above to achieve an unlocked state, when the sleeve is at the middle position, the radial bending section of the locking pin abuts against the first position point to achieve a locked state, and when the sleeve is at the lowest position, the radial bending section of the locking pin abuts against the second position point below to achieve an unlocked state.

5. The telescopic frame locking structure according to claim 1, characterized in that: When the radial bending section of the locking pin abuts against the first position point, the outer end of the locking pin penetrates the fixing rod and the telescopic rod due to the elastic force of the spring, so that the outer end is exposed on the outer side of the fixing rod to achieve a locked state.

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