CN101318452B - Three-point joint coupling hook for towing vehicle - Google Patents
Three-point joint coupling hook for towing vehicle Download PDFInfo
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- CN101318452B CN101318452B CN200710109604XA CN200710109604A CN101318452B CN 101318452 B CN101318452 B CN 101318452B CN 200710109604X A CN200710109604X A CN 200710109604XA CN 200710109604 A CN200710109604 A CN 200710109604A CN 101318452 B CN101318452 B CN 101318452B
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- brake plate
- control lever
- butt hook
- locking
- opening
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Abstract
The invention relates to a three-point jointed connection hook used for a tractor. The connection hook includes a connection larynx (27), a shell (25), a brake plate (2), a spring (8) which is arranged to pull the brake plate (2) to a locking position and an operation rod (3). The brake plate (2) is arranged to be manually opened by virtue of the operation rod; the brake plate (2) and the operation rod (3) are operated relative to the connection hook by virtue of an operation surface at the locking position; the supporting surface of the brake plate (2) and the operation rod (3) and a corresponding surface in the shell are together arranged to generate an acting force which locks the brake plate (2); wherein, the locking surface connected with the operation rod (3) stops the rotation of the operation rod; a supporting surface relative to the brake plate of the operation rod (3) is elongate which leads the operation rod (3) to be opened in a smaller degree, thus eliminating the opening force (FL) of a jointing ball (11).
Description
Technical field
The present invention relates to a kind of butt hook that is used for 3 joints of tractor truck.In the form of simplifying, butt hook belongs to such assembly, and wherein, brake plate and control lever are hinged on the assembly, can move through the guiding of surface of shell, and the locking power of brake plate is directed to housing through control lever.This assembly is different from butt hook, and brake plate wherein, control lever or the sub-arm that is hinged on both are hinged on again on the housing, and difference is: have only brake plate to carry out basic locking down the assisting of corresponding surface of its locking surface and housing.
Background technology
U.S. Pat 4157838 (DE 2645479) is chatted before it in part and is disclosed a kind of butt hook.Brake plate and control lever are hinged, and stop it to rotate the scope that exceeds setting each other.Thereby a spring is connected the bottom of control lever brake plate is drawn in lock position, realizes that these will receive aforesaid rotation restriction equally.But in this settling mode, vibration can bring some problems with relevant wearing and tearing.Because the locking surface of the reality in control lever is very short, even therefore very little initial movement will make the locking dislocation.
U.S. Pat 5497835 discloses a kind of butt hook, and wherein, locking is directly surperficial based on the locking of brake plate fully, and control lever is inoperative in basic locking.But control lever is used for locking fully brake plate can not use it.
European patent EP 1532854 discloses a kind of butt hook, and wherein, brake plate is resisted with respect to the pin on the housing and opened application force and be pressed into and be provided with in the path, and when the hole in the brake plate was pressed against on the pin of housing, brake plate was shifted control lever onto complete lock position.Control lever can not be pulled out along this path, surpasses above-mentioned pin but must be elevated.Therefore, control lever actual opened the direction that direction is different from " locking fully ".
Summary of the invention
The objective of the invention is in order to eliminate the defective of prior art, but neither damage the good locking of the crack force of brake plate opposing engage ball in lock position, also do not damage easily automatically locking.According to a preferred embodiment, the rotation of control lever stops by means of the stayed surface in the control lever.Another possibly be for brake plate and the control lever that is connected jointly on the pivot is provided with limiting surface, thereby crack force is transferred to control lever.
Description of drawings
Below in conjunction with accompanying drawing and the bright the present invention of as an exampleBSEMGVR takeN-PSVSEMOBJ.
Butt hook when being locked in the path of engage ball fully shown in Figure 1 for brake plate;
Shown in Figure 2ly slightly lift and the butt hook of brake plate when slightly opening for control lever;
Shown in Figure 3ly lift and the butt hook of brake plate when opening fully for control lever;
Shown in Figure 4ly lift the butt hook when upper position and brake plate are ineffective enduringly for control lever;
Shown in Figure 5ly all be locked in second butt hook in the path of engage ball for brake plate;
The specific embodiment
As shown in the figure, butt hook of the present invention does not demonstrate its lid, and in finished product, this lid is welded on the said butt hook.In addition, shown butt hook is littler than in kind.
Self also is fixed by welding in butt hook on the draw bar.As shown in Figure 1, butt hook comprises that one forges the main body 1 that forms, and has one to connect larynx 27 and housing 25 in it.It is conventional connecting larynx 27, is arranged to be exclusively used in hold engage ball 11.Usually, engage ball is installed on the device that will engage enduringly, perhaps is installed on the pin of 3 common joints.Like this, connection can not need engage ball to realize fast, but does not recommend to use.In addition, by means of an engage ball, eliminated the possible fine difference of angle between pin and the draw bar.Among the figure, engage ball marks with reference number 11.
Lockout mechanism comprises: a brake plate 2; Be hinged on the control lever 3 on the brake plate; With a spring 8, this spring one end is connected on the pin 19 of housing bottom, and its other end is connected the lower end of control lever 3, by this way brake plate 2 is drawn in lock position.
At the lock position place, brake plate 2 through self lower surface 15 be supported on the corresponding surface 4 of pin 4 ' on.The motion of brake plate 2 not only receives the restriction on above-mentioned a pair of surface; Also receive the restriction of the guiding surface of control lever 3; And transfer to a little the corresponding surface 33 of the pin 33 relative with stayed surface 7 ' on, said guiding surface be meant with brake plate 2 near the stayed surface on upper shed one side 17 relative corresponding surperficial 21.In this embodiment, stayed surface 21 must be higher than stayed surface 33 ' while and more be higher than pivot pin 6, thereby control lever 3 can not be rotated, the crack force FL that is parallel to brake plate 2 mainly be directed to pin 33 surface 33 '.As shown in Figure 2, stayed surface 7 continues to move down sizable distance in an identical manner, keeps this lockup state to be lifted to the height of pin 33 up to pivot pin 6.In this example, discharge engage ball through control lever 3 and accomplish about 45% of required opening travel.This part is preferably greater than 30% and be at least 15% usually.This required opening travel is the specific part in the actual unlatching path of control lever.
Initial period of self-opening operation (when engage ball 11 press open surperficial 12 the time); Brake plate 2 is around pin 4 rotation, runs into the lower edge 23 of opening up to the lower surface 20.1 of brake plate, when a new centre of gration forms; Since the rotation and the sliding action of brake plate, control lever 3 liftings.
When control lever 3 is lifted to position shown in Figure 2, in normal the unlatching, brake plate 2 can produce a spot of rotation.At first, some rotation of brake plate 2 on top braces surface 14, the very little distance of only sliding.For achieving this end, near a curved surface of zone formation on locking surface 20, if engage ball is in connecting larynx, this curved surface can rotate engage ball 11.After this, when control lever skidded off the opening between surface 21,33 ' (pin 33), brake plate is 13,23 slips along the surface.
As shown in Figure 3, enough height that control lever 3 has been lifted and discharge engage ball 11.As shown in Figure 4, if continue lifting a little, control lever 3 is along the direction rotation that connects housing, and the lower surface 36 of control lever 3 is lifted to the top of pin 33, and this gives pin 33 another use.
Embodiment shown in Figure 5 is with above-mentioned somewhat different.With regard to size, whole butt hook is in fact basic identical.Just, brake plate and control lever small different and produced clear and definite function difference.Function with the part of reference number same as described above mark is similar.In this case, only the upper opening of control lever with brake plate opposed edges side be useful, that is, here the stayed surface 7 of control lever 3 touch the corresponding surface 33 of pin 33 '.In this case, stop the rotation of control lever 3 through the mutual locking of brake plate 2 and control lever 3.Here, brake plate 2 also has the coupled pivot ears 2.1 of pivot pin 6 (among the figure topmost pivot ears be cut off).Yet the lower surface 39 of this pivot ears is confirmed size with the mode with respect to the corresponding surface 38 of control lever 3, that is, when the rotary manipulation bar, before the edge contact that on control lever 3 and upper opening the same side, more makes progress they are contacted.Be used to stop the moment of rotation to result from the application force that reaches through pivotal pin 6 transmission through these surfaces 38,39.Therefore, the crack force FL of engage ball is directed to the pin 33 of housing in the same manner described above.
Claims (12)
1. butt hook that is used for 3 joints of tractor truck; This butt hook comprises and connects larynx (27), housing (25), brake plate (2), is arranged to brake plate (2) is pulled to the spring (8) of lock position and from the extended control lever of upper opening part (3) of housing (25); Butt hook is fixed on the engage ball (11) of a device in the connection larynx (27); And lock through above-mentioned brake plate (2), this brake plate extends to the connection larynx from housing (25), when engage ball (11) when shell nozzle presses the open surfaces (12) of brake plate (2); Brake plate can be advanced in the housing (25); But, at lock position, the tangential crack force (F of the engage ball (11) in connecting larynx (27)
L) effect under, stop brake plate to be opened, wherein; Brake plate (2) is arranged to by control lever by manual unlocking; Brake plate (2) and the control lever (3) that is hinged on the brake plate are operated with respect to butt hook by means of the operating surface that is in lock position, and said operating surface does
-in the face of a side that connects larynx (27) against the locking surface (20) of engage ball (11),
-at the stayed surface (13) of opening upside and the slip upper surface (14) of brake plate (2), and
-in corresponding corresponding surperficial (21) in the face of the stayed surface (17) and the upper opening of brake plate (2) on the top of control lever (3), and
-on the corresponding corresponding surface (33 ') of the stayed surface (7) relative and the upper opening on the top of control lever (3) with brake plate (2),
Corresponding surface in the above-mentioned stayed surface (7,17) of brake plate (2) and control lever (3) and the housing (33 ', 21) be arranged to produce the application force of locking brake plate (2) jointly, thus eliminate crack force (F by engage ball (11) generation
L), it is characterized in that the locking surface of attended operation bar (3) stops the rotation of control lever; The above-mentioned stayed surface relative with the brake plate of control lever (3) is microscler; Allow control lever (3) to open lesser extent, like this, eliminated the crack force (F of above-mentioned engage ball (11) along the actual direction of opening
L).
2. butt hook according to claim 1 is characterized in that, stops the said locking surface of control lever (3) rotation by the common composition in the corresponding surface of the above-mentioned stayed surface (7,17) and the housing of control lever (3) (33 ', 21).
3. butt hook according to claim 1 is characterized in that, the said locking surface of prevention control lever (3) rotation is by the pivot (6) between brake plate (2) and the control lever (3) and limit surface (38, the 39) composition that they rotate each other.
4. butt hook according to claim 1 is characterized in that, the locking of brake plate (2) surface (20) must be a curved surface with its near zone, thereby makes a bit rotating on the upper support surface (13) that brake plate (2) gets around mouthful in the initial period of opening.
5. butt hook according to claim 4; It is characterized in that; In automatic locking stage, the bottom support surface of opening (23) and brake plate (2) are in contact with one another near the lower surface (20.1) of locking surperficial (20) and with respect to its slip, promptly; In case the above-mentioned lower surface (20.1) of brake plate (2) moves down a segment distance, engage ball (11) just presses the open surfaces (12) of brake plate (2).
6. butt hook according to claim 5; It is characterized in that; Said housing comprises the relative stayed surface (4 ') in bottom with brake plate (2), and this stayed surface (4 ') relative with the bottom of brake plate (2) is apart from the opening certain distance, when the locking stage begins automatically; Before brake plate (2) contacted with the above-mentioned bottom support surface (23) of opening and centers on above-mentioned some rotation, brake plate (2) was around this stayed surface (4 ') rotation relative with the bottom of brake plate (2).
7. butt hook according to claim 1 is characterized in that, said spring (8) is connected on the said control lever (3).
8. butt hook according to claim 1 is characterized in that, the lower surface (36) through lifting control lever (3) is positioned on (33 ') top, corresponding surface of housing its underpart, and said control lever (3) is lifted to upper position.
9. butt hook according to claim 1 is characterized in that, pivot (6) end of brake plate (2) is formed one forked by pivot ears (2.1), and said control lever (3) rotates between these pivot ears (2.1).
10. according to one of them described butt hook of claim 1-9, it is characterized in that by means of control lever (3), the microscler above-mentioned stayed surface (7) relative with the brake plate of control lever (3) is corresponding to discharging required at least 15% of the stroke of opening of said engage ball.
11. butt hook according to claim 10 is characterized in that, by means of control lever (3), the above-mentioned long support surface (7,17) relative with the brake plate of control lever (3) is corresponding to greater than discharging required 30% of the stroke of opening of said engage ball.
12. butt hook according to claim 1 is characterized in that, said butt hook is used for a draw bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710109604XA CN101318452B (en) | 2007-06-07 | 2007-06-07 | Three-point joint coupling hook for towing vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710109604XA CN101318452B (en) | 2007-06-07 | 2007-06-07 | Three-point joint coupling hook for towing vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101318452A CN101318452A (en) | 2008-12-10 |
| CN101318452B true CN101318452B (en) | 2012-06-27 |
Family
ID=40178809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710109604XA Active CN101318452B (en) | 2007-06-07 | 2007-06-07 | Three-point joint coupling hook for towing vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101318452B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2550898A (en) * | 2016-05-27 | 2017-12-06 | Bamford Excavators Ltd | Tow hitch assembly |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082497A (en) * | 1993-04-02 | 1994-02-23 | 何长生 | Automatic hook for motor vehicle |
| CN2209611Y (en) * | 1994-12-23 | 1995-10-11 | 赵广奎 | Tractor for vehicle |
| EP0726176A1 (en) * | 1995-02-11 | 1996-08-14 | Walter Hunger | Towing hitch |
| US6273447B1 (en) * | 1998-12-24 | 2001-08-14 | David M. Vande Berg | Trailer support with articulating, free castering wheels |
-
2007
- 2007-06-07 CN CN200710109604XA patent/CN101318452B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082497A (en) * | 1993-04-02 | 1994-02-23 | 何长生 | Automatic hook for motor vehicle |
| CN2209611Y (en) * | 1994-12-23 | 1995-10-11 | 赵广奎 | Tractor for vehicle |
| EP0726176A1 (en) * | 1995-02-11 | 1996-08-14 | Walter Hunger | Towing hitch |
| US6273447B1 (en) * | 1998-12-24 | 2001-08-14 | David M. Vande Berg | Trailer support with articulating, free castering wheels |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101318452A (en) | 2008-12-10 |
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