CN217382212U - Telescopic portable photographic rocker arm - Google Patents

Abstract

The utility model relates to a device field is shot to the movie & TV, specifically discloses a telescopic portable photographic rocking arm, include: the telescopic arm group comprises a main arm, a first telescopic arm and a second telescopic arm, a fixed seat, a counterweight component, a camera mounting seat, a telescopic connecting rod component, an adjusting component and a positioning component. The telescopic portable photography rocker arm in this embodiment is through being provided with the main arm in flexible armset, and be provided with the first flexible arm of telescopic and the flexible arm of second respectively at the both ends of main arm, so that flexible armset can realize folding, be convenient for assemble and carry, thereby can the overhanging length of automatically regulated first flexible arm through adjusting part conveniently adjust the counter weight at the in-process that uses, simultaneously can be when flexible armset adjusts length and when swinging through tip distance adjustable link assembly, be in the horizontality with the camera mount pad all the time, so that the gesture that can make the camera keeps.

Description

Telescopic portable photographic rocking arm

Technical Field

The utility model belongs to the device field is shot to the movie & TV, in particular to telescopic portable photographic rocking arm.

Background

In the process of film and television shooting, under the shooting working conditions of long distance or long depth, a shooting rocker arm is required to be used for carrying a camera to shoot, and in the process of shooting, although the camera always moves, the camera is required to always keep a fixed shooting angle.

The existing photography rocker arm is large in size, generally adopts an assembling mode, cannot be automatically stretched and folded, is extremely inconvenient in carrying and installing processes, and is also inconvenient to adjust the length of the rocker arm and adjust a balance weight during working.

The above background disclosure is only provided to aid understanding of the inventive concepts and solutions of the present invention, and it does not necessarily pertain to the prior art of this patent application, and it should not be used to assess the novelty and inventive aspects of this application without explicit evidence that such contents are disclosed at the filing date of this patent application.

Disclosure of Invention

An object of the utility model is to provide a telescopic portable photography rocking arm to it is not portable enough to overcome current photography rocking arm, installs inconvenient and can't conveniently adjust the defect of rocking arm length and counter weight.

In order to achieve the above object, the utility model provides a telescopic portable photographic rocking arm, include: the telescopic arm group comprises a main arm, a first telescopic arm and a second telescopic arm, wherein a first sliding cavity is formed in the main arm, two ends of the first sliding cavity extend outwards from two ends of the main arm respectively to form a first cavity opening and a second cavity opening, one end of the first telescopic arm is inserted into the first sliding cavity from the first cavity opening and can slide along the first sliding cavity, one end of the second telescopic arm is inserted into the first sliding cavity from the second cavity opening and can slide along the first sliding cavity, and a counterweight component is arranged at the other end of the first telescopic arm; the fixing seat comprises a first connecting end, a second connecting end and a third connecting end, the second connecting end is positioned between the first connecting end and the third connecting end, the first connecting end is rotatably connected with the middle part of the main arm, and the third connecting end is used for being connected with a tripod; the camera mounting seat comprises a fourth connecting end and a fifth connecting end, and the fourth connecting end is rotatably connected with the other end of the second telescopic arm; the distance between the two ends of the connecting rod assembly is adjustable and is respectively connected with the second connecting end and the fifth connecting end in a rotating mode, the connecting rod assembly is parallel to the telescopic arm group, and the distance between the first connecting end and the second connecting end is equal to the distance between the fourth connecting end and the fifth connecting end; and the adjusting assembly comprises a hand wheel and a screw rod which are connected with each other, the hand wheel is arranged on the first telescopic arm, the screw rod is connected between the main arm and the first telescopic arm, and when the hand wheel rotates, the screw rod can synchronously rotate, so that the first telescopic arm is driven to stretch and retract at the first cavity opening.

Preferably, in the above technical solution, a handle is provided on the main arm, and the position of the handle corresponds to the position of the first connection end.

Preferably, in the above technical scheme, the first connecting end is provided with a fixed seat hole, and both sides of the main arm are rotatably connected with the fixed seat hole through a detachable rotating seat respectively.

Preferably, in the above technical scheme, one end of the rotating seat is provided with a damping disc, the other end of the rotating seat is provided with a rotating shaft, the damping disc is mounted on the main arm through a screw, the rotating shaft is rotatably inserted into the hole of the fixed seat, and the end of the rotating shaft is sleeved with a shaft cover and is connected with the rotating shaft through a locking bolt.

Preferably, in the above technical solution, the apparatus further includes a positioning assembly, which includes: one end of the clamping block is provided with a clamping groove, the clamping groove is clamped at the edge of the fixed seat, and one end of the clamping block is abutted against the side part of the damping disc; and the first locking bolt penetrates through the clamping block from the other end of the clamping block and is in threaded connection with the fixed seat, and when the first locking bolt is tightened, one end of the clamping block can be pressed towards the damping disc.

Preferably, in the above technical scheme, a second sliding cavity is arranged in the first telescopic arm, and a third cavity opening communicated with the second sliding cavity is formed at one end of the first telescopic arm; a third sliding cavity is arranged in the second telescopic arm, and a fourth cavity opening communicated with the third sliding cavity is formed in one end of the second telescopic arm.

Preferably, in the above technical solution, one end of the first telescopic arm may be inserted into the third sliding cavity from the fourth cavity opening.

Preferably, in the above technical scheme, a second locking bolt and a third locking bolt are respectively arranged at the first cavity opening and the second cavity opening, the second locking bolt can lock the first telescopic arm, and the third locking bolt can lock the second telescopic arm.

Preferably, in the above technical solution, the connecting rod assembly includes: one end of the first connecting rod is rotatably connected with the second connecting end, the other end of the first connecting rod is provided with a pin hole, and a bolt is arranged in the pin hole; one end of the second connecting rod is inserted into the other end of the first connecting rod, a plurality of positioning holes are formed in the side portion of the second connecting rod, the positioning holes are arranged at equal intervals from one end of the second connecting rod to the other end of the second connecting rod, and the bolt can penetrate through the positioning holes to fix the position of the second connecting rod.

Preferably, among the above-mentioned technical scheme, the adjusting part still includes the screw rod seat, and its fixed setting is in the first sliding chamber, seted up on the screw rod seat with screw rod assorted screw, the screw rod passes the screw and rather than threaded connection, the lateral part of first flexible arm seted up with the spout of stepping down that the sliding chamber of second is linked together, the screw rod seat can slide in the spout of stepping down.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model provides a telescopic portable photographic rocking arm is through being provided with the main arm in flexible armset, and be provided with the first flexible arm of telescopic and the flexible arm of second respectively at the both ends of main arm, so that flexible armset can realize folding, be convenient for assemble and carry, thereby the in-process adjustment counter weight that conveniently uses of the overhanging length that can the first flexible arm of automatically regulated through adjusting part, simultaneously can be when flexible armset adjusts length and when swinging through tip distance adjustable link assembly, be in the horizontality with the camera mount pad all the time, so that the gesture that can make the camera keeps.

2. The utility model provides a be provided with the handle on the main arm, can carry the device after putting in receipts and draw, conveniently carry.

3. The utility model provides a be provided with the damping dish in the rotation seat and can carry out synchronous rotation along with the main arm, can block the damping dish through first locking bolt and fixture block among the locating component to make the angle between main arm and the fixing base keep fixed.

4. The utility model provides a first flexible arm and the flexible arm of second when the folding is contract in to the main arm simultaneously, first flexible arm also can insert simultaneously to the flexible arm of second in the third sliding cavity to the shrink length that makes flexible arm group is littleer.

5. The utility model provides a second connecting rod among the link assembly can insert the tip of first connecting rod and realize stretching out and drawing back to adjust length and fix a position, convenient and reliable through locating hole and locating pin.

6. The utility model provides an adjusting part passes through the hand wheel and drives the screw rod rotation, makes and produces relative motion between first flexible arm and the screw rod seat to it stretches out and draws back to drive first flexible arm from the first end of main arm.

Drawings

Fig. 1 is a structural view of the telescopic portable photographing swing arm of the present invention.

Fig. 2 is a partial cutaway view of the telescopic bar set.

Fig. 3 is a structural view of the connecting rod assembly.

Fig. 4 is an exploded view of the fixed mount, positioning assembly and rotating mount.

Description of the main reference numerals:

1-telescopic arm group, 11-main arm, 111-first sliding cavity, 112-first cavity port, 113-second cavity port, 12-first telescopic arm, 121-second sliding cavity, 122-third cavity port, 123-abdicating sliding groove, 13-second telescopic arm, 131-third sliding cavity, 132-fourth cavity port, 14-lifting handle, 15-rotating seat, 151-damping disc, 152-rotating shaft, 153-screw, 154-shaft cover, 155-locking bolt, 16-second locking bolt and 17-third locking bolt;

2-a fixed seat, 21-a first connecting end, 22-a second connecting end, 23-a third connecting end and 24-a fixed seat hole;

3-weight component, 31-weight rod, 32-weight plate, 33-lock pin;

4-camera mounting seat, 41-fourth connecting end, 42-fifth connecting end;

5-connecting rod component, 51-first connecting rod, 52-pin hole, 53-bolt, 54-second connecting rod and 55-positioning hole;

6-adjusting component, 61-hand wheel, 62-screw rod, 63-screw rod seat;

7-positioning component, 71-clamping block, 72-clamping block and 73-first locking bolt.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. The terms "first", "second" and "third", if any, are used for descriptive purposes only and for distinguishing between technical features and are not to be construed as indicating or implying relative importance or implying a number of indicated technical features or a precedence of indicated technical features.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "disposed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The following describes an embodiment of the present invention according to its overall structure.

As shown in fig. 1 to 4, the telescopic portable photographic swing arm in this embodiment includes: the telescopic arm set 1, the main arm 11, the first sliding cavity 111, the first cavity port 112, the second cavity port 113, the first telescopic arm 12, the second sliding cavity 121, the third cavity port 122, the abdicating sliding groove 123, the second telescopic arm 13, the third sliding cavity 131, the fourth cavity port 132, the handle 14, the rotating seat 15, the damping disc 151, the rotating shaft 152, the screw 153, the shaft cover 154, the locking bolt 155, the second locking bolt 16, the third locking bolt 17, the fixed seat 2, the first connecting end 21, the second connecting end 22, the third connecting end 23, the fixed seat hole 24, the weight component 3, the weight rod 31, the weight disc 32, the locking pin 33, the camera mounting seat 4, the fourth connecting end 41, the fifth connecting end 42, the connecting rod assembly 5, the first connecting rod 51, the pin hole 52, the pin 53, the second connecting rod 54, the positioning hole 55, the adjusting component 6, the hand wheel 61, the screw 62, the screw seat 63, the positioning component 7, the fixture block 71, the clamping groove 72, the first locking bolt 73.

The telescopic arm group 1 is composed of a main arm 11, a first telescopic arm 12 and a second telescopic arm 13, the main arm 11, the first telescopic arm 12 and the second telescopic arm 13 are all square tube structures, a first sliding cavity 111 is arranged in the main arm 11, and two ends of the first sliding cavity 111 respectively extend outwards from two ends of the main arm 11 and respectively form a first cavity port 112 and a second cavity port 113; a second sliding cavity 121 is arranged in the first telescopic arm 12, and a third cavity opening 122 communicated with the second sliding cavity 121 is formed at one end of the first telescopic arm 12; a third sliding cavity 131 is arranged in the second telescopic arm 13, and a fourth cavity 132 communicated with the third sliding cavity 131 is formed at one end of the second telescopic arm 13; one end of the first telescopic arm 12 is inserted into the first sliding cavity 111 from the first cavity opening 112 and can slide along the first sliding cavity, one end of the second telescopic arm 13 is inserted into the first sliding cavity 111 from the second cavity opening 113 and can slide along the first sliding cavity, and meanwhile, when the first telescopic arm 12 and the second telescopic arm 13 are simultaneously contracted into the first sliding cavity 111, one end of the first telescopic arm 12 can also be inserted into the third sliding cavity 131 from the fourth cavity opening 132, so that the whole telescopic arm group 1 is contracted more compactly, and the other end of the first telescopic arm 12 is provided with the counterweight component 3; a second locking bolt 16 and a third locking bolt 17 are respectively installed at the first cavity opening 112 and the second cavity opening 113, the end of the second locking bolt 16 can extend into the first sliding cavity 111 to prop against the side surface of the first telescopic arm 12 to lock the first telescopic arm, the end of the third locking bolt 17 can extend into the first sliding cavity 111 to prop against the side surface of the second telescopic arm 13 to lock the third telescopic arm, and a handle 14 is arranged on the main arm 11.

Specifically, the weight assembly 3 includes: a weight lever 31, a weight plate 32 and a lock pin 33; the balance weight rod 31 crosses the other end of the first telescopic arm 12, two ends of the balance weight rod 31 symmetrically extend outwards from two sides of the first telescopic arm 12 respectively, an equal number of balance weight discs 32 are sleeved on two ends of the balance weight rod 31 respectively, and the balance weight discs are clamped through the lock pins 33.

The fixed seat 2 comprises a first connecting end 21, a second connecting end 22 and a third connecting end 23, the second connecting end 22 is positioned between the first connecting end 21 and the third connecting end 23, the first connecting end 21 corresponds to the handle 14 in the main arm 11 and is rotatably connected with the main arm 11, and the third connecting end 23 is used for being installed on a tripod; the first connecting end 21 is provided with a fixed seat hole 24 and is provided with the positioning assembly 7, and two sides of the main arm 11 are respectively connected with the fixed seat hole 24 in a rotating manner through a detachable rotating seat 15 and are fixedly locked through the positioning assembly 7.

Specifically, one end of the rotary base 15 is provided with a damping disc 151, the other end of the rotary base 15 is provided with a rotating shaft 152 extending outward from an end surface of the damping disc 151, the damping disc 151 is mounted on the main arm 11 by a screw 153, the rotating shaft 152 is rotatably inserted into the fixing base hole 24, an end of the rotating shaft 152 is sleeved with a shaft cover 154, and a locking bolt 155 is interconnected with an end of the rotating shaft 152 to fix the shaft cover 154.

Specifically, the positioning assembly 7 includes a latch 71 and a first locking bolt 73; one end of the fixture block 71 is provided with a fixture groove 72, the fixture groove 72 is clamped at the edge of the fixed seat 2 close to the first connection end 21, and the end surface of one end of the fixture block 71 is abutted against the side part of the damping disc 151; the first locking bolt 73 penetrates the latch 71 from the other end of the latch 71 and is in threaded connection with the fixed seat 2, and when the first locking bolt 73 is tightened, the end face of one end of the latch 71 can be pressed against the damping disc 151 so as to fix the angle of the rotating seat 15.

The camera mounting seat 4 comprises a fourth connecting end 41 and a fifth connecting end 42, the fourth connecting end 41 is rotatably connected with the other end of the second telescopic arm 13, and the camera mounting seat 4 is used for fixedly mounting a camera; the distance between the two ends of the connecting rod assembly 5 is adjustable and is respectively connected with the second connecting end 22 and the fifth connecting end 42 in a rotating mode, the connecting rod assembly 5 is parallel to the telescopic arm group 1, the distance between the first connecting end 21 and the second connecting end 22 is equal to the distance between the fourth connecting end 41 and the fifth connecting end 42, and the length of the connecting rod assembly 5 can be adjusted along with the overhanging length of the second telescopic arm 13.

Specifically, the link assembly 5 includes a first link 51 and a second link 54; one end of the first link 51 is rotatably connected with the second link 22, a pin hole 52 is formed in a side portion of the other end of the first link 51, the pin hole 52 is penetrated through the pin hole, a detachable plug 53 is installed in the pin hole 52, one end of the second link 54 is inserted into the other end of the first link 51 and can be extended and retracted, a plurality of positioning holes 55 are formed in a side portion of the second link 54, the positioning holes 55 are arranged at equal intervals from one end of the second link 54 to the other end of the second link 54, and the plug 53 can penetrate through the positioning holes 55 to fix the position of the second link 54.

An adjusting component 6 is further installed between the first telescopic boom 12 and the main boom 11, the adjusting component 6 comprises a hand wheel 61, a screw 62 and a screw seat 63 which are connected with each other, the hand wheel 61 is rotatably connected on the end surface of the other end of the first telescopic boom 12, the screw 62 is positioned and one end of the screw is coaxially and fixedly connected with the middle part of the hand wheel 61, the screw seat 63 is fixedly installed in the first sliding cavity 111 through bolts, a screw hole matched with the screw 62 is formed in the screw seat 63, the other end of the screw 62 passes through the screw hole and is in threaded connection with the screw hole, a yielding chute 123 communicated with the second sliding cavity 121 is formed in the side part of the first telescopic boom 12, the screw seat 63 can slide in the yielding chute 123, the second sliding cavity 121 is connected between the main boom 11 and the first telescopic boom 12, the screw 62 can synchronously rotate when the hand wheel 61 rotates, because one end of the screw 63 can generate relative displacement with the screw seat 63 when the screw 63 rotates, so that the first telescopic arm 12, which is rotatably connected to one end of the screw 63, can be made to telescope at the first port 112.

In summary, the telescopic portable photographing rocker arm in the embodiment is provided with the main arm in the telescopic arm group, and the two ends of the main arm are respectively provided with the first telescopic arm and the second telescopic arm, so that the telescopic arm group can be folded, and is convenient to assemble and carry, and the overhanging length of the first telescopic arm can be automatically adjusted through the adjusting assembly, so that the counterweight can be conveniently adjusted in the using process, and meanwhile, the camera mounting seat can be always in a horizontal state through the connecting rod assembly with the adjustable end distance when the telescopic arm group adjusts the length and swings, so that the posture of the camera can be maintained.

The foregoing description of the specific exemplary embodiments of the invention has been presented for the purposes of illustration and description, and is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching, although examples of the invention have been shown and described, the present examples are intended to be illustrative of the invention and are not intended to be limiting of the invention, the particular features, structures, materials or characteristics described may be suitably combined in any one or more of the examples or illustrations, the exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application, to thereby enable others skilled in the art to utilize the invention in such detail without departing from the principles and spirit of the invention, modifications, substitutions, variations and various alternatives and changes of the embodiments may be made as necessary without inventive contribution to the art, but are protected by patent laws within the scope of the claims of the present invention.

Claims (10)

1. A telescopic portable photographic rocker arm, comprising:

the telescopic arm group (1) comprises a main arm (11), a first telescopic arm (12) and a second telescopic arm (13), wherein a first sliding cavity (111) is formed in the main arm (11), two ends of the first sliding cavity (111) extend outwards from two ends of the main arm (11) respectively to form a first cavity opening (112) and a second cavity opening (113), one end of the first telescopic arm (12) is inserted into the first sliding cavity (111) from the first cavity opening (112) and can slide along the first sliding cavity, one end of the second telescopic arm (13) is inserted into the first sliding cavity (111) from the second cavity opening (113) and can slide along the first sliding cavity, and the other end of the first telescopic arm (12) is provided with a counterweight component (3);

the fixing seat (2) comprises a first connecting end (21), a second connecting end (22) and a third connecting end (23), the second connecting end (22) is located between the first connecting end (21) and the third connecting end (23), the first connecting end (21) is rotatably connected with the middle of the main arm (11), and the third connecting end (23) is used for being connected with a tripod;

the camera mounting seat (4) comprises a fourth connecting end (41) and a fifth connecting end (42), and the fourth connecting end (41) is rotatably connected with the other end of the second telescopic arm (13);

the distance between two ends of the connecting rod assembly (5) is adjustable and is respectively connected with the second connecting end (22) and the fifth connecting end (42) in a rotating mode, the connecting rod assembly (5) is parallel to the telescopic arm group (1), and the distance between the first connecting end (21) and the second connecting end (22) is equal to the distance between the fourth connecting end (41) and the fifth connecting end (42);

the adjusting assembly (6) comprises a hand wheel (61) and a screw rod (62) which are connected with each other, the hand wheel (61) is arranged on the first telescopic arm (12), the screw rod (62) is connected between the main arm (11) and the first telescopic arm (12), and when the hand wheel (61) rotates, the screw rod (62) can synchronously rotate, so that the first telescopic arm (12) is driven to stretch and retract at the first cavity opening (112).

2. The telescopic portable photographic swing arm according to claim 1, characterized in that a handle (14) is provided on the main arm (11), the position of the handle (14) corresponding to the position of the first connection end (21).

3. The telescopic portable photographic swing arm according to claim 1, wherein the first connecting end (21) is provided with a fixed seat hole (24), and both sides of the main arm (11) are rotatably connected with the fixed seat hole (24) through a detachable rotating seat (15).

4. The telescopic portable photographic swing arm according to claim 3, wherein one end of the rotary base (15) is provided with a damping disc (151), the other end of the rotary base (15) is provided with a rotating shaft (152), the damping disc (151) is mounted on the main arm (11) through a screw (153), the rotating shaft (152) is rotatably inserted into the fixed base hole (24), and the end of the rotating shaft (152) is sleeved with a shaft cover (154) and is connected with the rotating shaft (152) through a locking bolt (155).

5. The telescopic portable photographic rocker arm according to claim 4, further comprising a positioning assembly (7) comprising:

one end of the clamping block (71) is provided with a clamping groove (72), the clamping groove (72) is clamped at the edge of the fixed seat (2), and one end of the clamping block (71) is abutted against the side part of the damping disc (151);

and the first locking bolt (73) penetrates through the fixture block (71) from the other end of the fixture block (71) and is in threaded connection with the fixed seat (2), and when the first locking bolt (73) is tightened, one end of the fixture block (71) can be pressed towards the damping disc (151).

6. The telescopic portable photographic rocker arm of claim 1, wherein a second sliding cavity (121) is arranged in the first telescopic arm (12), and a third cavity opening (122) communicated with the second sliding cavity (121) is formed at one end of the first telescopic arm (12); a third sliding cavity (131) is arranged in the second telescopic arm (13), and a fourth cavity opening (132) communicated with the third sliding cavity (131) is formed in one end of the second telescopic arm (13).

7. The telescopic portable photographic rocker arm of claim 6, wherein one end of the first telescopic arm (12) is insertable into the third sliding chamber (131) from the fourth port (132).

8. The telescopic portable photographic swing arm according to claim 1, characterized in that a second locking bolt (16) and a third locking bolt (17) are provided at the first (112) and second (113) ports, respectively, the second locking bolt (16) being capable of locking the first telescopic arm (12) and the third locking bolt (17) being capable of locking the second telescopic arm (13).

9. The telescopic portable photographic rocker arm according to claim 1, characterized in that the connecting-rod assembly (5) comprises:

one end of the first connecting rod (51) is rotatably connected with the second connecting end (22), the other end of the first connecting rod (51) is provided with a pin hole (52), and a bolt (53) is arranged in the pin hole (52);

and a second link (54) having one end inserted into the other end of the first link (51), wherein a plurality of positioning holes (55) are formed in a side portion of the second link (54), the positioning holes (55) are arranged at equal intervals from one end of the second link (54) to the other end thereof, and the bolts (53) can pass through the positioning holes (55) to fix the position of the second link (54).

10. The telescopic portable photographic rocker arm of claim 6, wherein the adjustment assembly (6) further comprises a screw seat (63) fixedly disposed in the first sliding cavity (111), a screw hole matched with the screw rod (62) is formed in the screw seat (63), the screw rod (62) passes through the screw hole and is in threaded connection with the screw hole, an abdicating sliding groove (123) communicated with the second sliding cavity (121) is formed in a side portion of the first telescopic arm (12), and the screw seat (63) can slide in the abdicating sliding groove (123).

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