CN212028261U

CN212028261U - Pivot arm mechanism

Info

Publication number: CN212028261U
Application number: CN202020590728.5U
Authority: CN
Inventors: 舒平国; 夏彬彬; 毛朝忠
Original assignee: Ningbo Zhongtian Haide Hydraulic Co ltd
Current assignee: Ningbo Zhongtian Haide Hydraulic Co ltd
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-11-27
Anticipated expiration: 2030-04-20

Abstract

The utility model relates to a pivot arm mechanism, including first pivot arm, second pivot arm, and first pivot arm, second pivot arm all adopt hollow square pipe to make, first pivot arm inserts in second pivot arm, the bottom surface of first pivot arm is equipped with the bar groove, the bottom surface of second pivot arm is equipped with the through-hole that supplies the screw knob to alternate, and the through-hole is corresponding with the bar groove and distributes, square nut has been placed in the first pivot arm, the screw knob is adapted with square nut, and realize length adjustment and fixed between first pivot arm and the second pivot arm; a guide assembly is arranged between the first pivot arm and the second pivot arm; the utility model has the advantages of simple structure, convenient adjustment and good stability.

Description

Pivot arm mechanism

Technical Field

The utility model belongs to the technical field of coupling mechanism, especially, relate to a pivot arm mechanism.

Background

The pivot arm mechanism is generally applied to a plurality of folding support brackets, and can play a role in supporting and adjusting; however, the structure of the existing pivot arm structural design is complex, the pivot arm mechanism is troublesome to adjust in adjusting the length, thereby bringing certain inconvenience to operators, and after adjustment, the stability in the use process is not high and the performance is not good.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a pivot arm mechanism with simple structure, convenient adjustment and good stability.

The utility model aims at completing the technical proposal that the pivot arm mechanism comprises a first pivot arm and a second pivot arm, wherein the first pivot arm and the second pivot arm are both made of hollow square tubes, the first pivot arm is inserted into the second pivot arm, the bottom surface of the first pivot arm is provided with a strip-shaped groove, the bottom surface of the second pivot arm is provided with through holes for inserting a thread knob, the through holes and the strip-shaped groove are correspondingly distributed, a square nut is arranged in the first pivot arm, the thread knob is matched with the square nut, and the length adjustment and the fixation between the first pivot arm and the second pivot arm are realized; a guide assembly is disposed between the first pivot arm and the second pivot arm.

Preferably, the guide assembly includes a screw threadedly mounted in a mounting hole provided in a side surface of the second pivot arm, and a guide groove provided in a side surface of the first pivot arm.

Preferably, the guide groove is of a strip-shaped structure, the guide groove is located in front of the strip-shaped groove, and the length of the guide groove is greater than that of the strip-shaped groove.

Preferably, the threaded knob comprises a screw rod and a knob, and the knob is integrally injection-molded on one end of the screw rod.

Preferably, the square nut is located in the first pivot arm, and the end surface of the square nut facing the bottom surface of the first pivot arm is a toothed surface.

Preferably, the length of the diagonal of the square nut is greater than the width of the first pivot arm.

Preferably, the through hole is located on a bottom surface at an end corner of the second pivot arm, and the strip-shaped groove is located on a bottom surface at a front end of the first pivot arm.

The utility model has the advantages that: the pivot arm mechanisms are matched with the square nuts through the threaded knobs and the strip-shaped grooves and the through holes, so that the adjustment and the fixation are more convenient, and the square nuts are more conveniently mounted and the pivot arms are more conveniently matched; through set up the direction subassembly on pivot arm mechanism, can play the guide effect, can play the effect of locking pine again to make whole pivot arm mechanism stability better, and adjust also more accurate and convenient in adjusting the use.

Drawings

Fig. 1 is a schematic perspective view of the pivot arm mechanism of the present invention.

Fig. 2 is a schematic view of the sectional structure a-a of fig. 1.

Fig. 3 is a schematic structural view of the front cross section at B of fig. 1.

The reference numbers in the drawings are respectively: 1. a first pivot arm; 2. a second pivot arm; 3. a threaded knob; 4. a square nut; 5. a guide assembly; 11. a strip-shaped groove; 21. a through hole; 22. mounting holes; 31. a screw; 32. a knob; 41. a tooth surface; 51. a screw; 52. a guide groove.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings: as shown in fig. 1 to 3, the present invention comprises a first pivot arm 1 and a second pivot arm 2, wherein the first pivot arm 1 and the second pivot arm 2 are both made of hollow square tubes, which is convenient for limiting and adjusting; first pivot arm 1 inserts in second pivot arm 2, and the bottom surface of first pivot arm 1 is equipped with bar groove 11, and the bottom surface of second pivot arm 2 is equipped with the through-hole 21 that supplies screw knob 3 to alternate, and through-hole 21 and bar groove 11 are the corresponding distribution, has placed square nut 4 in first pivot arm 1, and screw knob 3 and square nut 4 are adapted to, and realize the length adjustment and the fixed between first pivot arm 1 and the second pivot arm 2, if: when the threaded knob 3 is unscrewed, at the moment, the two pivot arms can be retracted inwards or pulled outwards to adjust the length required by the whole pivot arm mechanism, then the threaded knob 3 is screwed down, and the square nut 4 is contacted with the end wall of the strip-shaped groove 11 and the end wall of the through hole 21 to realize compaction and fixation; the guide assembly 5 is arranged between the first pivot arm 1 and the second pivot arm 2, so that the guide effect between the two pivot arms can be achieved, and the effect of preventing the two pivot arms from being separated when the screw knob 3 and the square nut 4 are failed can be achieved, so that the whole pivot arm mechanism is better in stability in the adjusting and using process, more accurate in adjustment and higher in safety.

For the convenience of assembly, the guide assembly 5 includes a screw 51 and a guide slot 52, the screw 51 is installed on the installation hole 22 provided on the side surface of the second pivot arm 2 by a screw connection manner, the guide slot 52 is provided on the side surface of the first pivot arm 1, and the screw 51 is located in the guide slot 52, if the two pivot arms need to be separated, the screw 51 is only screwed out of the installation hole 22.

The guide way 52 is the bar-shaped structure, and the guide way 52 is located the place ahead of bar-shaped groove 11, and the length of guide way 52 is greater than the length of bar-shaped groove 11, the direction of the guide way 52 of being convenient for like this to and in pivot arm mechanism adjustment process, stability is better, and the precision is also better.

In order to make the structure more firm and the equipment more convenient, the screw thread knob 3 includes screw rod 31, knob 32, and the integrative injection moulding of knob 32 is on one end of screw rod 31, when unscrewing between screw thread knob 3 and square nut 4, in order to prevent that screw thread knob 3 from coming loose, screw rod 3 can adopt the pressure rivet screw.

When the threaded knob 3 is screwed, in order to increase the friction force between the square nut 4 and the first pivot arm 1, the square nut 4 is positioned in the first pivot arm 1, the end surface of the square nut 4 facing the bottom surface of the first pivot arm 1 is a tooth surface 41, and the friction force is greatly increased through the tooth surface 41, so that the safety performance is better, and the clamping force is also better.

To prevent the square nut 4 from rotating within the first pivot arm 1 when the threaded knob 3 is tightened, the length of the diagonal of the square nut 4 is greater than the width of the first pivot arm 1, so that the square nut 4 can be trapped within the first pivot arm 1 when the threaded knob 3 is rotated.

To maximize the length adjustability of the entire pivot arm mechanism, the through-hole 21 is located on the bottom surface at the corner of the second pivot arm 2 and the strip-shaped groove 11 is located on the bottom surface at the front end of the first pivot arm 1.

The present invention is not limited to the above embodiments, and any change is made on the shape or material composition, and all the structural designs provided by the present invention are all the deformation of the present invention, which should be considered within the protection scope of the present invention.

Claims

1. A pivot arm mechanism comprises a first pivot arm (1) and a second pivot arm (2), wherein the first pivot arm (1) and the second pivot arm (2) are both made of hollow square tubes, and the pivot arm mechanism is characterized in that: the first pivot arm (1) is inserted into the second pivot arm (2), a strip-shaped groove (11) is formed in the bottom surface of the first pivot arm (1), a through hole (21) for a threaded knob (3) to penetrate through is formed in the bottom surface of the second pivot arm (2), the through hole (21) and the strip-shaped groove (11) are distributed correspondingly, a square nut (4) is placed in the first pivot arm (1), the threaded knob (3) is matched with the square nut (4), and length adjustment and fixation between the first pivot arm (1) and the second pivot arm (2) are achieved; a guide assembly (5) is arranged between the first pivot arm (1) and the second pivot arm (2).

2. The pivot arm mechanism of claim 1, wherein: the guide assembly (5) comprises a screw (51) and a guide groove (52), the screw (51) is installed on an installation hole (22) formed in the side face of the second pivot arm (2) in a threaded connection mode, and the guide groove (52) is formed in the side face of the first pivot arm (1).

3. The pivot arm mechanism of claim 2, wherein: the guide groove (52) is of a strip-shaped structure, the guide groove (52) is located in the front of the strip-shaped groove (11), and the length of the guide groove (52) is greater than that of the strip-shaped groove (11).

4. The pivot arm mechanism of claim 1, wherein: the threaded knob (3) comprises a screw rod (31) and a knob (32), and the knob (32) is integrally injection-molded at one end of the screw rod (31).

5. The pivot arm mechanism of claim 1, wherein: the square nut (4) is positioned in the first pivot arm (1), and the end surface of the square nut (4) facing the bottom surface of the first pivot arm (1) is a tooth surface (41).

6. The pivot arm mechanism of claim 1, wherein: the length of the diagonal of the square nut (4) is greater than the width of the first pivot arm (1).

7. The pivot arm mechanism of claim 1, wherein: the through hole (21) is positioned on the bottom surface of the corner of the second pivot arm (2), and the strip-shaped groove (11) is positioned on the bottom surface of the front end of the first pivot arm (1).