CN203604430U

CN203604430U - Self-locking knuckle

Info

Publication number: CN203604430U
Application number: CN201320349123.7U
Authority: CN
Inventors: 侯夫辰
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-06-13
Filing date: 2013-06-13
Publication date: 2014-05-21
Anticipated expiration: 2023-06-13

Abstract

The utility model relates to a mechanical knuckle, and particularly relates to a self-locking knuckle. The mechanism knuckle comprises an upper knuckle, a lower knuckle, a shaft sleeve, a shaft, wedges, elastic pieces, and a driving plate; the upper knuckle and the lower knuckle can relatively rotate, wherein the shaft sleeve and the upper knuckle are connected and fixed, the shaft and the lower knuckle are connected and fixed, the shaft and the shaft sleeve are coaxial and the shaft penetrates through the shaft sleeve, a plurality of wedge-shaped cavities are formed between the shaft and the shaft sleeve, and the elastic pieces and the wedges are positioned in the wedge-shaped cavities; the driving plate and the shaft are coaxial, and shifting forks on the driving plate are positioned on the other sides of the wedges relative to the elastic pieces; the corresponding wedges and the elastic pieces are identical in number; the wedges are pushed towards one sides, where the wedge-shaped space is smaller, through the elastic pieces, so that the wedges are close to the shaft and the shaft sleeve and lock the shaft and the shaft sleeve; the shifting fork of the driving plate can push the wedges towards one sides where the wedge-shaped space is larger, under the action of external force, so that the wedges are far away from the shaft and the shaft sleeve and release the shaft and the shaft sleeve. The self-locking knuckle provided by the utility model is simple to destruct, is locked by matching wedge-shaped blocks with the wedge-shaped space, and can freely move only by pushing the driving plate.

Description

Self-locking joint

[technical field]

The utility model relates to mechanical joint field, can be used for every profession and trade flexible, folding connecting rod, support arm etc.

[background technique]

The flexible class mechanical device such as support arm, connecting rod has joint, in the anti-loose structure of joint, there are the modes such as screw-threaded coupling, eccentric shaft locking, click unidirectional self-lock, damping self-locking, after joint opening angle is adjusted, by modes such as screw thread, eccentric shaft, click, dampings, opening angle is fixed up, unclamp screw thread or ratchet, or larger making every effort to overcome take damping, can regulate and articulate opening angle.

At present, the locking mode that joint adopts has following several mode, and screw thread and eccentric shaft locking mode need to, by the loosening operation and could regulate of handle or instrument, need to carry out locking operation after adjusting completes; Rely on the fixing mode of damping, when in joint, suffered moment of torsion does not exceed predetermined range, due to the existence of damping, joint can not be rotated, and make joint motion, must put on joint to be greater than the moment of torsion of damping, makes joint motion; Click mode, thus rely on ratchet to stop several rotation fixing joints of taking turns to the interlock of ratchet on ratchet, outer power is unclamped ratchet, and ratchet can freely rotate.

At present, above several locking modes that joint adopts, operate more inconveniently, or reliability is poor, structure is more complicated.Screw thread and eccentric shaft locking mode need to, by the loosening operation and could regulate of handle or instrument, need to carry out locking operation after adjusting completes, and operate more numerous and diverse; Rely on the fixing mode of damping, in the time that stressed or damping condition (wearing and tearing of damping part surface, pretightening force variation etc.) change, fixed block is unreliable, and joint locking is unstable; Click mode,, can not be locked for dividing at an arbitrary position to the slewing area people in joint, and relative complex structure, and assembly precision requires high.

To sum up, in prior art, the operability of knuckle lock locking structure, reliability, manufacturability are also weak, and also need to optimize.

[summary of the invention]

In order to solve prior art in the shortcoming aspect operability, reliability, promote manufacturability, a kind of easy to operate, reliability is high, manufacturability is good scheme is now proposed.

The technical solution of the utility model is as follows:

A kind of joint assembly, comprises upper joint, hypozygal, axle sleeve, axle, wedge part, elastic component, driver plate; Described upper joint, hypozygal can relatively rotate around axle; Wherein, axle sleeve is connected with upper joint and fixes, and axle is connected with hypozygal and fixes, and axle is concentric also through axle sleeve with axle sleeve, and in the special-shaped space of elastic component wedge part between axle and axle sleeve, elastic component is positioned at the back side of wedge part in joint auto lock direction; Driver plate is coaxial with axle, and the fork on driver plate is positioned at the opposite side of wedge part with respect to elastic component; Special-shaped space between axle and axle sleeve is wedge shape, and such space has several around axle, and corresponding wedge part, elastic component also have same number; Elastic component is pushed wedge part to a side that wedge shape space is less, makes wedge part press close to axle and axle sleeve; The shift fork of driver plate can be pushed wedge part to the side that wedge shape space is larger under external force, makes wedge part away from axle and axle sleeve; In the situation that driver plate is not subject to external force, joint occurs relatively to turn, if the sense of rotation of axle trends towards the side that wedge shape space is less, because can driving wedge part, frictional force existence moves to same direction, due to spatial constraints, wedge part is stuck between axle and axle sleeve, and axle and axle sleeve can not relatively rotate; If the sense of rotation of axle trends towards the side that wedge shape space is larger, because can driving wedge part, frictional force existence moves to same direction, and wedge part can depart between axle and axle sleeve, and axle and axle sleeve can relatively rotate; In the time that driver plate is subject to external force, shift fork is stirred the power that wedge part overcomes elastic component and is moved, and regardless of rotational axis direction, wedge part can not be stuck between axle and axle sleeve, and joint can freely be rotated.

The joint scheme that the utility model is set forth is simple and reliable, utilizes wedge shape space and wedge part to move and makes joint locked in one direction, in another direction, can rotate; Stir driver plate and just can make joint rotate at both direction, easy to operate, reliable lock; Joint can be locked at an arbitrary position, there is no movable diastema gap.

[accompanying drawing explanation]

Below case study on implementation of the present utility model and the designed accompanying drawing of prior art are introduced.

Fig. 1 is the disassemblying structure schematic diagram in the self-locking joint of the utility model case study on implementation.

Fig. 2 is the package assembly sectional drawing in the self-locking joint of the utility model case study on implementation.

Fig. 3 is partial sectional view.

1-driver plate 2-axle sleeve 3-axle 4-bearing 5-spring 6-wedge part 7-hypozygal

8-pad 9-upper joint 10-pad 11-set screw

[embodiment]

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical solution of the utility model is carried out to complete, clearly description, described embodiment is only a part of embodiment of the utility model scheme, rather than whole embodiments.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment who obtains under creative work prerequisite, all belong to the scope of the utility model protection.

Only reason for convenience, in the following description, use specific direction term, such as " on ", D score, " left side ", " right side " etc., take corresponding accompanying drawing as reference, can not think limitation of the present invention, in the time that the definition direction of drawing changes, the direction that these words represent should be interpreted as corresponding different direction.

As depicted in figs. 1 and 2, the utility model embodiment's medical support arm joint assembly comprises driver plate 1, axle sleeve 2, axle 3, bearing 4, spring 5, wedge part 6, hypozygal 7, pad 8, upper joint 9, pad 10, set screw 11.

Wherein, described hypozygal 7 passes through axle 3 axial restraints with upper joint 9, and can relatively rotate around axle 3; As shown in Figure 2, hypozygal 7 is thin walled shell with upper joint 9, has a circular hole 12 on the sidewall of hypozygal 7, has flat round hole 13, two holes coaxial on the sidewall of upper joint 9, and hypozygal 7 and upper joint 9 sidewall with holes is pressed close to mutually; Between the sidewall of pressing close to mutually at hypozygal 7 and upper joint 9, there is a pad 8, the friction can reduce hypozygal 7 and relatively rotate with upper joint 9 time; Bearing 4 is embedded in the areole 12 of hypozygal 7, axle 3 is through the hole on the sidewall of bearing 4 and upper joint 9, matching with the flat round hole 13 on the sidewall of upper joint 9 in the flat position 14 of axle 3 ends, axle 3 can not be relatively rotated with upper joint 9, but can relatively rotate with hypozygal 7; The shoulder 17 of axle 4 coordinates with bearing 4, and tapped hole and the set screw 11 of axle 3 ends assemble, and makes hypozygal 7 and upper joint 9 pass through axle 3 axial restraints.Fixing between axle sleeve 2 outer rings and hypozygal 7, axle sleeve 2 is coaxial with the areole 12 of hypozygal 7; Axle sleeve 2 is enclosed within axle 3 outsides, and on axle sleeve, special-shaped slot and axle 3 outer rings form several wedge shape cavitys 15, are distributed in around axle 3; In each wedge cavities, there are a wedge part 6 and a spring 5, spring 5 one end lean against on the sidewall that wedge shape cavity 15 is roomy, and the other end leans against on wedge part 6, and impels the trend of the narrow lateral movement of the oriented wedge shape cavity of wedge part 6; On driver plate 1, have the shift fork 16 perpendicular to driver plate, the number of shift fork 16 is identical with the number of wedge shape cavity 15, and shift fork 16 is assemblied in wedge part 6 in the interior narrow side of wedge shape cavity 15; Driver plate 1 is coaxial with axle 3, and can rotate around axle 3.

In the time that axle 3 narrows direction rotation to wedge shape cavity 15, due to the existence of frictional force, axle 3 can band makes the trend of the narrow lateral movement of the oriented wedge shape cavity 15 of wedge part 6, but due to the shape of wedge shape cavity 15, wedge part 6 is stuck between axle 3 and axle sleeve 2, make can not relatively rotate between axle 3 and axle sleeve 2, by noted earlier, axle sleeve 2 is fixing with hypozygal 7, and axle and upper joint 9 are fixing, now, hypozygal 7 can not relatively rotate with upper joint 9; In the time that axle 3 broadens direction rotation to wedge shape cavity 15, due to the existence of frictional force, axle 3 can be with the trend that makes the roomy lateral movement of the oriented wedge shape cavity 15 of wedge part 6, between axle 3 and axle sleeve 2, relatively rotates, and now, hypozygal 7 can not relatively rotate with upper joint 9; Driver plate 1 is in the time rotating to wedge part 6 one sides, shift fork 16 on driver plate 1 can promote wedge part 6 to the roomy side shifting of wedge shape cavity 15, and now, no matter axle 3 rotates clockwise or counterclockwise, wedge part 6 can not make axle 3 and axle sleeve 2 locked, and upper joint 7 and hypozygal 9 can freely relatively rotate; Loosen driver plate 1, wedge part 6 recovers ortho states under the effect of spring 5.

The self-locking articulation structure that the utility model provides is simple, utilize the cooperation of wedge-shaped blocks and wedge shape space to lock joint, promote driver plate, just can make joint freely movable, loosen driver plate, joint again can auto lock, acts on outer moment of torsion on joint larger, lock tightlyer, ensure so this self-locking joint can provide very reliably.

Above content is in conjunction with concrete mode of execution further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.

Claims

1. a self-locking joint, comprise the first joint, second joint, axle sleeve, axle, wedge part, elastic component, the driver plate of coaxial setting, it is characterized in that described the first joint and second joint relatively rotate connection, axle sleeve can be synchronizeed and be rotationally connected with the first side arthrodesis, axle is rotationally connected with fixing can the synchronizeing of second joint, and axle sleeve inner ring is distributed with several wedge slots, matches form several wedge shape cavitys with axle, wedge part, elastic component are installed in wedge shape cavity, and driver plate and axle coaxially assemble.

2. self-locking according to claim 1 joint, is characterized in that the interior elastic component of described wedge shape cavity forces the trend of the narrow side shifting of the oriented wedge shape cavity of wedge part.

3. self-locking according to claim 1 joint, is characterized in that having and the same number of shift fork of wedge slot on driver plate, and driver plate upper shift fork is also positioned at wedge shape cavity, and driver plate can rotate around the axis.

4. self-locking according to claim 1 joint, it is characterized in that driver plate and wedge part have two working positions, driver plate can rotate and reach two working positions, in the time of the first working position, the elastic force that shift fork can force wedge part to overcome elastic component moves, the disengaging of wedge part contacts with axle and axle sleeve, axle and axle sleeve can relatively rotate, in the time of the second working position, shift fork departs from wedge part, wedge part under the effect of elastic component, press close to the external frame of axle and axle sleeve and be stuck in axle and axle sleeve between, thereby stop relatively rotating of axle and axle sleeve.