An extendable insulated conductor clamp
Patent Information
- Application Number
- CN202621546689.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-30
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2036-09-30
AI Technical Summary
Existing telescopic insulated drain clamps require both hands to hold when adjusting the length of the rod, which is cumbersome. Furthermore, the grip position can easily compress the safe insulation distance as the rod moves, increasing the safety risks of live-line work.
The telescopic grip assembly, helical fitting pair, elastic locking mechanism and axial stop boss are used to achieve telescopic adjustment and station locking with fixed grip position. By operating the rotation limit structure of the grip sleeve and telescopic inner tube and the transmission of the helical fitting pair, combined with the engagement and positioning of the elastic locking mechanism and the locking groove, the locking reliability of the telescopic station is ensured.
It improves the safety and convenience of live-line work, ensures a fixed grip position, enhances the locking reliability of the telescopic work station, and guarantees insulation performance and product durability.
Smart Images
Figure CN224935275U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of live-line working insulation tools, specifically relating to a telescopic insulating drain clamp. Background Technology
[0002] Insulated current-draining clamps are commonly used tools for live-line maintenance of power distribution networks. They are mainly used in scenarios such as temporary bypass current-draining of overhead lines and live-line connection. By isolating the high-voltage conductor from the workers through the insulating rod, non-contact conductor connection is achieved, taking into account both work safety and operational efficiency.
[0003] Existing telescopic insulated drain clamps have a grip fixedly connected to the telescopic tube. When the adjusting rod is long, the operator needs to use both hands to switch grip positions for adjustment, which is cumbersome. Furthermore, during telescopic operation, the grip position moves towards the high-voltage end with the rod, which can easily compress the safe insulation distance and increase the safety risks of live-line work. Therefore, there is an urgent need for a telescopic insulated drain clamp with a fixed grip position and safe and convenient operation. Utility Model Content
[0004] The purpose of this utility model is to provide a telescopic insulated drain clamp, which achieves telescopic adjustment and station locking with fixed grip position through the cooperation of telescopic grip component, spiral fitting pair, elastic locking mechanism and axial stop boss, so as to solve the problems mentioned in the background art.
[0005] The technical solution of this utility model is implemented as follows: a telescopic insulated drain clamp includes a drain clamp head and an insulating shed section, and further includes: The telescopic grip assembly includes a fixed base tube connected to the bottom end of the insulating umbrella skirt section, a telescopic inner tube nested and slidably assembled to the fixed base tube, and an operating grip sleeve axially limited and circumferentially rotatable assembled to the bottom end of the telescopic inner tube. An elastic locking mechanism is provided between the fixed base tube and the telescopic inner tube. The outer wall of the telescopic inner tube is provided with a locking groove that cooperates with the elastic locking mechanism, and the inner wall of the fixed base tube is provided with an axial stop boss. The bottom end of the fixed base tube and the top end of the operating grip sleeve are provided with a matching spiral mating pair.
[0006] The present invention is further configured such that an annular limiting groove is provided on the outer wall of the bottom end of the telescopic inner tube, and an annular limiting rib is provided on the inner wall of the top end of the operating grip sleeve. The annular limiting rib is inserted into the annular limiting groove to achieve axial limiting and circumferential relative rotation between the two.
[0007] The present invention is further configured such that the elastic locking mechanism is in multiple groups arranged along the circumference of the fixed base tube, each group including a positioning pin, an insulating reset spring and a mounting seat. The fixed base tube has a through assembly hole radially opened in the tube wall, and the mounting seat is fixed to the outside of the assembly hole and communicates with it. Under normal conditions, the insulating reset spring drives the inner end of the positioning pin to pass through the assembly hole and lock into the locking groove.
[0008] The present invention is further configured such that the elastic locking mechanism consists of two sets, which are symmetrically arranged 180° around the circumference of the fixed base tube.
[0009] The present invention is further configured such that the locking groove is an annular groove opened circumferentially on the outer wall of the telescopic inner tube, and multiple locking grooves are arranged at intervals along the axial direction, respectively corresponding to the extension station and the storage station.
[0010] The present invention is further provided that the outer wall of the operating grip sleeve is covered with an anti-slip layer.
[0011] The present invention is further configured such that both the fixed base tube and the telescopic inner tube are epoxy glass fiber tubes.
[0012] By adopting the above technical solution, the beneficial effects that this utility model can achieve are: 1. By operating the rotation limit structure of the grip sleeve and the telescopic inner tube in conjunction with the screw drive, the grip position is fixed throughout the telescopic adjustment, which improves the safety and convenience of live-line work.
[0013] 2. By engaging and positioning the elastic locking mechanism with the locking groove, and combining the spiral mating pair to push the telescopic inner tube against the axial stop boss, dual-position locking is achieved, which improves the locking reliability of the telescopic position.
[0014] 3. By using epoxy fiberglass material for both the fixed base tube and the telescopic inner tube, along with a modular locking mechanism, insulation performance is ensured and component maintenance is facilitated, thereby improving the product's durability and cost-effectiveness. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a utility model Figure 1 A schematic diagram of the cross-sectional structure of part A; Figure 3 This is a utility model Figure 2 A schematic diagram of the enlarged structure of part B; Figure 4 This is a cross-sectional structural diagram of the extension station of this utility model.
[0016] The attached figures are labeled as follows: 1. Drainage clamp head; 2. Insulating umbrella skirt section; 3. Telescopic grip assembly; 30. Fixed base tube; 31. Telescopic inner tube; 32. Operating grip sleeve; 4. Elastic locking mechanism; 40. Positioning pin; 41. Insulating return spring; 42. Mounting base; 5. Locking groove; 6. Axial stop boss; 7. Helical mating pair; 8. Annular limit groove; 9. Annular limit rib; 10. Assembly hole; 11. Anti-slip layer. Detailed Implementation
[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-4 : Example:
[0018] This embodiment provides a telescopic insulated drain clamp, including a drain clamp head 1 and an insulating shed section, and further includes: The telescopic grip assembly 3 includes a fixed base tube 30 connected to the bottom end of the insulating umbrella skirt section, a telescopic inner tube 31 nested and slidably assembled to the fixed base tube 30, and an operating grip sleeve 32 axially limited and circumferentially rotatable assembled to the bottom end of the telescopic inner tube 31. An elastic locking mechanism 4 is provided between the fixed base tube 30 and the telescopic inner tube 31. The outer wall of the telescopic inner tube 31 is provided with a locking groove 5 that cooperates with the elastic locking mechanism 4. The inner wall of the fixed base tube 30 is provided with an axial stop boss 6. Among them, a matching spiral mating pair 7 is provided between the bottom end of the fixed base tube 30 and the top end of the operating grip sleeve 32.
[0019] This embodiment relates to a telescopic insulated drain clamp, which includes, from top to bottom, a drain clamp head 1, an insulating skirt section, and a telescopic gripping assembly 3. The drain clamp head 1 is used to clamp the high-voltage conductor to achieve current conduction. The insulating skirt section is used to extend the insulation creepage distance and block high-voltage surface discharge. The telescopic gripping assembly 3 serves as the main structure for operation and length adjustment. It adopts a nested telescopic structure combined with a rotatable grip design to achieve rod length adjustment.
[0020] The fixed base tube 30 is a hollow cylindrical component, formed by epoxy glass fiber pultrusion. Its upper end is coaxially connected and fixed to the bottom end of the insulating umbrella skirt section, serving as the load-bearing base of the telescopic grip assembly 3. An axial stop boss 6 is integrally formed on the inner wall of the fixed base tube 30 near its upper end. The axial stop boss 6 is an annular protrusion extending continuously along the circumference of the inner wall of the tube, with the protruding surface facing the inside of the tube cavity. It limits the upward sliding limit of the telescopic inner tube 31 and also serves as a supporting end face for the telescopic inner tube 31 to be tightened in the retracted state. A through-hole 10 is radially opened in the lower part of the fixed base tube 30. A mounting seat 42 is correspondingly provided on the outer side of the mounting hole 10. The mounting seat 42 is a hollow cylindrical structure with one open end. Its open end fits against the outer wall of the fixed base tube 30 and is fixed to the fixed base tube 30 as a single unit using insulating adhesive. The inner cavity of the mounting seat 42 is coaxially connected to the mounting hole 10. The bottom outer side of the fixed base tube 30 is machined with an external thread section, which constitutes the external meshing part of the helical mating pair 7.
[0021] The telescopic inner tube 31 is a hollow cylindrical component, formed by pultrusion of epoxy glass fiber. It is nested within the inner cavity of the fixed base tube 30, with its outer wall fitting closely to the inner wall of the fixed base tube 30, allowing it to slide back and forth along the axis of the fixed base tube 30. Multiple locking grooves 5 are spaced axially on the outer wall of the telescopic inner tube 31. Each locking groove 5 is an annular groove continuously surrounding the outer wall of the telescopic inner tube 31. The two sides of the groove's cross-section are rounded transition surfaces, corresponding to different axial positions of the telescopic inner tube 31, used to cooperate with the elastic locking mechanism 4 to achieve axial position locking. The annular groove structure allows it to engage with the positioning pin 40 without circumferential alignment, adapting to the circumferential rotation characteristics of the operating grip sleeve 32. The rounded transition surfaces on both sides can automatically push the positioning pin 40 outward under axial thrust, achieving axial feeding of the telescopic inner tube 31 without additional manual unlocking. An annular limiting groove 8 is provided on the outer wall of the bottom end of the telescopic inner tube 31. The annular limiting groove 8 is an inwardly recessed groove that extends continuously along the circumference of the tube wall. The groove wall is flat and smooth, and is used to cooperate with the operating grip sleeve 32 to achieve axial limiting and circumferential rotation.
[0022] The operating grip sleeve 32 is a hollow sleeve-shaped component, coaxially assembled on the outside of the bottom end of the telescopic inner tube 31, and is the component that the operator grips and applies force to. The inner wall of the top of the operating grip sleeve 32 is integrally formed with an annular limiting rib 9, which is an annular protrusion that extends continuously along the circumference of the inner wall, and its cross-sectional shape is adapted to the annular limiting groove 8. During assembly, the operating grip sleeve 32 can be fitted onto the bottom end of the telescopic inner tube 31 using a thermal expansion process. After cooling, the annular limiting rib 9 is inserted into the annular limiting groove 8, so that the operating grip sleeve 32 cannot detach from the telescopic inner tube 31 axially, and can rotate freely around the axis of the telescopic inner tube 31. The operating grip sleeve 32 can also adopt a split upper and lower snap-fit structure, which is fixed by adhesive after snapping, and the annular limiting rib 9 and the annular limiting groove 8 can be assembled and matched in the same way. The inner wall of the top end of the operating grip sleeve 32 is machined with an internal thread section, which matches the tooth profile of the external thread section at the bottom end of the fixed base tube 30. Together, they form a helical fit pair 7. When the operating grip sleeve 32 rotates circumferentially, the rotational motion is converted into axial linear displacement through thread engagement. In this embodiment, the helical fit pair 7 adopts a continuous internal and external thread form. In other equivalent embodiments, the helical fit pair 7 can also adopt a structure in which intermittent helical convex ridges and corresponding helical grooves engage, and both can achieve the same transmission effect. The outer wall of the operating grip sleeve 32 is covered with an anti-slip layer 11. The surface of the anti-slip layer 11 forms a continuous annular convex-concave texture to increase the friction during gripping.
[0023] An elastic locking mechanism 4 is disposed between the fixed base tube 30 and the telescopic inner tube 31 to lock and unlock the telescopic inner tube 31 in its axial position. Two sets of the elastic locking mechanism 4 are arranged symmetrically at 180° along the circumference of the fixed base tube 30. Each set includes a positioning pin 40, an insulating return spring 41, and a mounting base 42. The positioning pin 40 is a columnar component, coaxially inserted into the inner cavity of the mounting base 42 and the through assembly hole 10, and can slide radially back and forth. A pressure-bearing boss is integrally formed on the middle of the outer wall of the positioning pin 40, and the pressure-bearing boss is an annular protrusion structure. A limit cap is integrally formed on the outer end of the positioning pin 40, the diameter of which is larger than the diameter of the through hole at the outer end of the mounting base 41. This limit cap restricts the inward travel of the positioning pin 40 and also serves as a force application point for easy outward pulling to unlock. An insulating return spring 41 is sleeved on the outside of the positioning pin 40 and is entirely housed within the inner cavity of the mounting base 42. One end of the spring abuts against the outer wall of the inner cavity of the mounting base 42, and the other end abuts against the outer end face of the pressure-bearing boss. Under normal conditions, the insulating return spring 41 is in a compressed state, continuously applying an inward elastic thrust to the pressure-bearing boss, driving the inner end of the positioning pin 40 to pass through the through assembly hole 10 and extend into the inner cavity of the fixed base tube 30, where it engages with the corresponding locking groove 5 of the telescopic inner tube 31, thus achieving locking. When the outer end of the positioning pin 40 is pulled outward, the elastic force of the insulating return spring 41 is overcome, causing the inner end of the positioning pin 40 to exit the locking groove 5, thus unlocking.
[0024] The telescopic insulated drain clamp operates in two states: extension and retraction. In the extension state, pulling down the operating grip sleeve 32 causes the telescopic inner tube 31 to slide downwards along the inner wall of the fixed base tube 30. When the telescopic inner tube 31 slides to the locking groove 5 corresponding to the extension position and aligns with the positioning pin 40, the insulating reset spring 41 pushes the inner end of the positioning pin 40 into the locking groove 5, locking the axial position of the telescopic inner tube 31. At this time, the operating grip sleeve 32 is separated from the threaded section of the fixed base tube 30, allowing the operating grip sleeve 32 to rotate freely around the axis of the telescopic inner tube 31. The operator can then grip the operating grip sleeve 32 to perform live clamping operations, maintaining a fixed grip position throughout the entire process. When in the retracted state, rotate the operating grip sleeve 32 to engage the internal thread section with the external thread section of the fixed base tube 30. As the operating grip sleeve 32 continues to rotate, the helical mating pair 7 converts the circumferential rotation into an axial upward thrust, causing the telescopic inner tube 31 to slide upward along the inner wall of the fixed base tube 30. When the sliding reaches the locking groove 5 corresponding to the retracted pre-positioning position and aligns with the positioning pin 40, the positioning pin 40 engages in the groove to achieve initial positioning. At this time, there is still a gap between the top of the telescopic inner tube 31 and the axial stop boss 6. Continue to rotate the operating grip sleeve 32, and the axial thrust generated by the thread engagement will push the positioning pin 40 outward through the arc transition surface of the locking groove 5. The telescopic inner tube 31 continues to move upward until the top end face of the telescopic inner tube 31 is tightly abutted against the bottom surface of the axial stop boss 6. The retracted state is reliably locked by relying on the self-locking characteristics of the thread. The operator's hands do not need to leave the operating grip sleeve 32 during the entire adjustment process.
[0025] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.
Claims
1. A telescopic insulated drain clamp, comprising a drain clamp head (1) and an insulating shed section, characterized in that, Also includes: The telescopic grip assembly (3) includes a fixed base tube (30) connected to the bottom end of the insulating umbrella skirt section, a telescopic inner tube (31) nested and slidably assembled to the fixed base tube (30), and an operating grip sleeve (32) axially limited and circumferentially rotatable assembled to the bottom end of the telescopic inner tube (31). An elastic locking mechanism (4) is provided between the fixed base tube (30) and the telescopic inner tube (31). The outer wall of the telescopic inner tube (31) is provided with a locking groove (5) that cooperates with the elastic locking mechanism (4). The inner wall of the fixed base tube (30) is provided with an axial stop boss (6). Among them, a matching spiral mating pair (7) is provided between the bottom end of the fixed base tube (30) and the top end of the operating grip sleeve (32).
2. The telescopic insulated drain clamp according to claim 1, characterized in that, The telescopic inner tube (31) has an annular limiting groove (8) on the outer wall at the bottom end, and the operating grip sleeve (32) has an annular limiting rib (9) on the inner wall at the top end. The annular limiting rib (9) is inserted into the annular limiting groove (8) to achieve axial limiting and circumferential relative rotation between the two.
3. The telescopic insulated drain clamp according to claim 1, characterized in that, The elastic locking mechanism (4) consists of multiple sets arranged circumferentially along the fixed base tube (30). Each set includes a positioning pin (40), an insulating reset spring (41), and a mounting seat (42). The wall of the fixed base tube (30) is radially provided with a through assembly hole (10). The mounting seat (42) is fixed to the outside of the assembly hole (10) and communicates with it. Under normal conditions, the insulating reset spring (41) drives the inner end of the positioning pin (40) to pass through the assembly hole (10) and engage in the locking groove (5).
4. A telescopic insulated drain clamp according to claim 3, characterized in that, The elastic locking mechanism (4) consists of two sets, which are symmetrically arranged 180° around the fixed base tube (30).
5. A telescopic insulated drain clamp according to claim 1, characterized in that, The locking groove (5) is an annular groove opened circumferentially on the outer wall of the telescopic inner tube (31). Multiple locking grooves (5) are arranged at intervals along the axial direction, corresponding to the extension station and the storage station respectively.
6. A telescopic insulated drain clamp according to claim 1, characterized in that, The outer wall of the operating grip sleeve (32) is covered with an anti-slip layer (11).
7. A telescopic insulated drain clamp according to claim 1, characterized in that, Both the fixed base tube (30) and the telescopic inner tube (31) are epoxy fiberglass tubes.