CN1274468C

CN1274468C - Tension device for strap or likes

Info

Publication number: CN1274468C
Application number: CN 200410062101
Authority: CN
Inventors: 乌韦·舍贝尔
Original assignee: DE WIREROPE SALES DOLITZ GmbH
Current assignee: DE WIREROPE SALES DOLITZ GmbH
Priority date: 2003-07-04
Filing date: 2004-07-02
Publication date: 2006-09-13
Anticipated expiration: 2024-07-02
Also published as: DE20310296U1; CN1575933A

Abstract

A tension device for straps or analogous clamping members comprises a tensioning frame (1), a tensioning hand shank (2) installed at the tensioning frame (1) in a rotary mode, a tape winding shaft (3) used for startup and rotatablely mounted at the tensioning frame (1), and a driving locking mechanism (4, 5, 6) having a driving ratchet pawl (5) and a locking ratchet pawl (6), wherein the driving ratchet pawl (5) engages with at least one ratchet wheel (4). In accordance with the present invention, in order to unclamp a strap step by step, the driving ratchet pawl (5) and the locking ratchet pawl (6) engage alternately with the ratchet wheel (4).

Description

The tensioning apparatus that is used for belt or analog

Technical field

The present invention relates to be used for the tensioning apparatus of belt or similar clamping part, it comprises a tensioning frame, also comprise a tensioning handle, be rotatably installed on the tensioning frame, be used to start rotation and be installed in a belt spool on the tensioning frame, comprise that also one drives and locking mechanism, have one and drive a ratchet and a locking pawl, drive ratchet and engage with at least one ratchet.

Background technology

Such tensioning apparatus is known fully, for example referring to document EP 0455085B1, DE19652109C2 and DE3344487C1.

The tensioning apparatus of prior art is effectively, the feasibility aspect that particularly relates to progressively rather than suddenly unclamp belt.Yet with respect to the background of the solution that comprises suitable machinery or structural effort that proposes in some cases, they can improve.This is particularly useful for the instruction among the document EP 0455085B1.This is owing to except driving slide block and driving the ratchet, also be provided with two lock sliders that engage with locking wheel or ratchet.Each lock slider is movably in an independent carriage direct part.This needs a plurality of members and makes assembling or install complicated.The present invention is intended to overcome this defective.

Summary of the invention

The technical problem that the present invention is based on is further to improve the belt tensioning apparatus of the initial type of describing, and makes designs simplification, the cost reduction, but have identical functions.

In order to solve this technical problem, tensioning apparatus within the scope of the present invention is characterised in that, in order to unclamp belt step by step, driving ratchet and locking pawl alternately engages with ratchet, described alternately the joint finished by at least one cam, and for driving ratchet a tensioning block is set, cam is along the opposite side of the directive effect opposite with the tension direction of tensioning handle at the tensioning block.

According to the instruction of document EP 0455085B1, tensioning apparatus of the present invention makes it possible to unclamp step by step the belt of tensioning, and tooth ground of a tooth carries out.Yet different with known method, the present invention depends on the driving ratchet that links together with locking pawl.Drive ratchet and locking pawl thereby replaced two lock sliders among the document EP 0455085B1.

Under these circumstances, drive ratchet and have dual-use function.On the one hand, the driving ratchet that is connected with the tensioning handle guarantees that the belt spool is along the tension direction of the tensioning handle belt of the common rolling of tensioning gradually.On the other hand, for unclamping belt, drive ratchet at this moment along the direction opposite with tension direction, be that the direction of unclamping of tensioning handle is used.Obtain a kind of simple especially structure thus, its function is identical with the function of prior art.

Particularly, instruction according to the present invention has prevented that the belt of tensioning from suddenly unclamping.On the contrary, in this case, belt unclamps on tooth ground of a tooth equally step by step.Different with the instruction of document DE19652109C2, the additional guiding side plate that is used for the belt set bolt can save, and promptly in this case, has realized the reduction of manufacturing cost.Consider document DE3240993C2, also can use these equally.At last, if also consider document DE19720910A1, it can not unclamp the belt of tensioning suddenly this point and foreclose.The present invention has overcome all problems by so a kind of structure, this structure simplicity of design and having superiority especially aspect cost.

In this case, be very favourable if alternately engaging between verified driving ratchet and the locking pawl finished by at least one cam.This cam is usually located on the tensioning handle.Cam is usually located between the side of the tensioning handle that is located at the roll of tape shaft end respectively and ratchet.

In addition, in most of the cases, the tensioning block is set for driving ratchet.This tensioning block has guaranteed to drive ratchet and tensioning handle only can realize certain angle of inclination along tension direction.Drive function from it and be transformed into release function in order to drive ratchet, need be along the direction opposite, promptly unclamp direction and make and drive ratchet and move and cross related tensioning block with tension direction.In this case, cam opposite with tension direction, only act on the opposite side of tensioning block.

That is to say, in order to use the driving ratchet to unclamp the belt spool, drive ratchet and must move to cross the tensioning block and enter cam subsequently and act on the operating space that drives on ratchet and the locking pawl simultaneously, they are alternately engaged with ratchet during progressively the unclamping of belt.

As described, in order to unclamp belt step by step, the tensioning handle is along the unclamp direction effect opposite with tension direction, and cam acts on simultaneously and drives on ratchet and the locking pawl.When the driving ratchet is installed on the tensioning handle with longitudinal movement, these can be finished admirably.For this reason, the driving ratchet can have the extension in the cannelure that is directed into the tensioning handle in both sides.

Drive ratchet and locking pawl and on the ratchet direction, load usually, make and to finish required tensioning and unclamp by spring.

Therefore, provide structure simple especially tensioning apparatus, can additionally prevent the unclamping of anything unexpected of tensioning belt with uncontrolled, this be because described belt can only be step by step, promptly tooth ground of a tooth unclamps.This function is finished by uncomplicated especially and low-cost configuration, not only has the driving function because drive ratchet, but also has release function.Can see the advantage that it is main at this.

Description of drawings

Describe the present invention in detail referring now to accompanying drawing, accompanying drawing only illustrates an exemplary embodiment.

Fig. 1 is the stereogram according to tensioning apparatus of the present invention;

Thin portion view among Fig. 1 when Fig. 2 illustrates the belt tensioning;

Fig. 1 when Fig. 3 and Fig. 4 illustrate belt and unclamp and the thin portion among Fig. 2.

The specific embodiment

Accompanying drawing illustrates a kind of tensioning apparatus that is used for tensioning belt or analog, its basic structure comprises: 1, one tensioning handle 2 of a tensioning frame is installed on the tensioning frame 1 rotationally, be used for starting and rotate a belt spool 3 that is installed on the tensioning frame 1, and driving and

locking mechanism

4,5,6.Drive and

locking mechanism

4,5,6 constitutes at the ratchet 4 of belt spool 3 ends, a driving ratchet 5 and a locking pawl 6 respectively by two substantially.Locking pawl 6 has two hook tooths that are respectively applied for two ratchets 4.

Driving ratchet 5 vertically is installed in the tensioning handle 2 movably.For this reason, this driving ratchet 5 has the extension, side 7 in the cannelure 8 that is bonded on tensioning handle 2.A handle 9 is in the extension that vertically is located at driving ratchet 5 of tensioning handle 2, and by means of this, driving ratchet 5 is being resisted the elastic force of spring 10 and can thrown off with the single tooth of ratchet 4 and engage.Need not manual operation, spring 10 is guaranteed to drive ratchet 5 and is relied on the corresponding ratchet 4 or between the single tooth in ratchet 4 ground.

In order to use belt of above-mentioned tensioning apparatus tensioning, on belt spool 3, spool has a groove for this reason with roll of tape.If start tensioning handle 2 along tension direction (direction of arrow 11 among Fig. 1 and 2), locking pawl 6 is under the assistance of spring, slide along the flank of tooth of the slight inclination of the tooth of ratchet 4, and arrive between corresponding two teeth, make the belt that has been involved in and has continued to be wrapped on the belt spool 3 (no longer) unexpectedly not unclamp along opposite direction.

Within the scope of the invention, belt can unclamp step by step, particularly alternately engages with corresponding ratchet 4 by driving ratchet 5 and locking pawl 6.This finishes by a cam 12, and cam is used when direction 13 is moved along unclamping shown in Fig. 3 and 4 at tensioning handle 2.Cam 12 is positioned on the tensioning handle 2, and especially respectively between the side and corresponding ratchet 4 of tensioning handle 2.In this case, use two cams 12 that are located at respectively on belt spool 3 ends.

Above-mentioned cam 12 is along the direction opposite with tension direction 11, promptly unclamp the opposite side that direction 13 only acts on a tensioning block 14.This tensioning block 14 guarantees to drive ratchet 5 in all cases, only extend along tension direction 11 on certain angle α, this angle is greater than 90 °, and is about 100 ° to 120 ° according to exemplary embodiment.Bigger angle [alpha] also is feasible naturally, and is covered by the present invention.

Cam 12 uses at the opposite side of this angle [alpha], promptly even bigger angle.For this reason, drive ratchet 5 and must mobilely earlier cross corresponding tensioning block 14.This is by pull handle 9 and cross tensioning block 14 unclamping on the direction 13 mobile tensioning handle upwards suitably.

According to unshowned a kind of modification, cam 12 can act on simultaneously and drive on ratchet 5 and the locking pawl 6.Yet, in the scope that illustrates, if necessary, have only locking pawl 6 relying on cam 12, also can tilt and drive ratchet 5 free-running operations with tensioning handle 2.

If tensioning handle 2 moves along unclamping direction 13, in first step, cam 12 is guaranteed locking pawl 6 and relevant tooth disengagement.This is shown in Figure 4.Because belt spool 3 is subjected to the tension force from belt, belt spool 3 turns an angle widdershins.

Yet because after the anglec of rotation of the spacing between common corresponding two teeth, driving ratchet 5 collides a tooth or belt spool 3 stops, the motion that this is counterclockwise stops.This is also shown in Figure 4.

On the contrary, Fig. 3 illustrates the beginning of release process, and wherein, tensioning handle 2 moves along unclamping direction 13, and it is therewith mobile to drive ratchet 5.Because so counterclockwise motion, at first, locking pawl 6 is lifted by cam 12, then, drives ratchet 5 flank of tooth against next tooth under the assistance of spring.Belt spool 3 and ratchet therewith 4 can rotate counterclockwise, until driving the precipitous flank of tooth that ratchet 5 collides tooth, as shown in Figure 4.

In next release process, locking pawl 6 will (again) against corresponding ratchet 4, be lifted and drive ratchet 5, make belt spool 3 further to rotate around another tooth.Thus, tensioning handle 2 guarantees along the direction opposite with tension direction 11, promptly to unclamp progressively the unclamping of belt of direction 13.

Claims

1. tensioning apparatus that is used for belt or similar clamping part, it comprises:

-one tensioning frame (1) also comprises,

-one tensioning handle (2) is rotatably installed on the tensioning frame (1), and be used for starting being rotatably installed in a belt spool (3) of tensioning frame (1), and comprise,

-one driving and locking mechanism (4,5,6) have one and drive a ratchet (5) and a locking pawl (6), and the driving ratchet engages with at least one ratchet (4),

It is characterized by,, drive ratchet (5) and locking pawl (6) and alternately engage with ratchet (4) for progressively unclamping of belt,

Driving alternately engaging of ratchet (5) and locking pawl (6) finishes by at least one cam (12), for driving ratchet (5) a tensioning block (14) is set, cam (12) is along the opposite side of the directive effect opposite with the tension direction (11) of tensioning handle (2) in tensioning block (14).

2. tensioning apparatus as claimed in claim 1 is characterized by, and cam (12) acts on simultaneously and drives on ratchet (5) and the locking pawl (6).

3. tensioning apparatus as claimed in claim 1 is characterized by, and for progressively unclamping of belt, tensioning handle (2) is applied along the direction (13) of unclamping opposite with tension direction (11).

4. tensioning apparatus as claimed in claim 1 is characterized by, and drives ratchet (5) and is installed in longitudinal movement on the tensioning handle (2).

5. tensioning apparatus as claimed in claim 1 is characterized by, and drives ratchet (5) and locking pawl (6) and loads by spring on ratchet (4) direction.