JPH1078186A - Worm-drive clamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a danger due to a housing expanding toward the end of a set screw. SOLUTION: This clamp is formed so that the radial inner ends 7 of the superposed ends 6 and 7 of a tightening band 1 are jointed to the bottom 9 of a housing 2 in a properly engaged state. In this case, the housing 2 is formed to have a housing band 10 with the end properly connected to and along the butt joint of the zone of the bottom 9, and the radial inner ends 7 of the band 1 form a radially continuous groove 12 on the radial inner side thereof for accommodating the bottom 9 of the housing 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention comprises a tightening band, a housing, a clockwise tightening screw having a head and a threaded shank, the tightening bands having mutually overlapping ends, The radially outer end is provided with a threading element that engages the threaded shank, and the radially inner end surrounds the end and the clamping screw shank and has both circumferential clamping. It is positively connected to the bottom of the housing that supports the screws (is positively
lockingly connected) the housing comprises a housing band whose ends define and are connected together with a butt joint in the area of the bottom, the end radially inward of the fastening band being the fastening band. And has an axially continuous groove, radially inward, for receiving the bottom of the housing, the bottom edge facing the head of the fastening screw having a first tongue. A worm drive having a second tongue on the other side of the joint, having a second tongue on one side of the joint and mutually contacting and engaging the first opening at one axial edge of the groove Regarding the clamp.

[0002]

BACKGROUND OF THE INVENTION A known worm drive clamp of this type is disclosed in U.S. Pat. No. 3,315,989.
With reference to the above publication, the ends of the housing band are connected to the inner end of the clamping band by spot welding and are therefore indirect to one another. However, spot welding requires additional work and long downtime in the automated manufacturing process due to the often required electrode changes. Furthermore, spot welding is, on the one hand, difficult to check and, on the other hand, not safe enough to cause intercrystalline corrosion. The two tongues are co-planar at the bottom of the housing and together serve little to hold the end of the housing band.

[0003] Other known worm thread clamps (DE 94 19 543.9 Ul, US Patent 3,950,830)
No. 3,900,932), such as a hammer or dovetail, which is provided at one end of the housing band and engages in the form of a recess of a shape corresponding to the other end of the housing band. Connected using a simple tongue. However, there is the following danger when a large clamping force is involved. That is, the frictional force of the clamping screw, which acts axially at the radially outer end of the clamping band, causes an axial distortion of the radially outer end. Therefore, the end is on the side of the head of the clamping screw,
The housing is axially opened as the end of a joint defining the edge of the end of the housing band so that it simply leans against each other and spreads in the circumferential direction of the clamp.

US Pat. No. 5,315,737 and DE 24 02 761 B1 disclose a worm thread clamp provided on the tongue at both edges at the bottom of the housing, with a slight circular end. The tongues which engage the holes at the radially inner end of the clamping band, which are bent inward, are arranged in a circumferential relationship on both sides of the butt joint. In U.S. Pat. No. 5,315,737, the tongue is bent radially outward and at an angle in the circumferential direction. The hole must be relatively large so that the tongue can be passed through the hole in the band. Thus, when the clamps are tightened, the tongues on the side of the head of the tightening screw are easily bent back substantially circumferentially back to their starting position. They do little to hinder the housing disclosed in DE 24 02 761 B1 in which the clearance of the tongue of the hole of the tightening band is clearly lower. However, nevertheless, after being inserted into the hole, it must be bent in the circumferential direction, requiring a complete assembly process. In addition, the tongues of both US Pat. No. 5,315,737 and DE 24 02 761 B1 obstruct the radially outer end of the tightening band by hooking over the end. When tightening the clamp,
There is a danger with the tongue bent by the radially outer end of the band and forced radially inward of the hole at the radially inner end of the band.

[0005] The present invention relates to a part of the disclosure of this specification in which the danger of the housing which opens, to a considerable extent, is avoided and welding is avoided, especially in the region of the end of the butt joint towards the head of the clamping screw. It is based on the problem of providing such a worm drive clamp as described above.

[0006]

According to the present invention, the ends of the housing band are connected in a positive mating relationship at the joint and viewed in the direction of insertion of the radially outer end of the clamping band within the housing. A first tongue, having a housing at the top, on the right hand, is axially wider than the second tongue, a first opening is provided at the bottom of the groove, and a first and a second are provided. The tongues are bent radially outward, their free ends are aligned substantially flush with the radially outward of the bottom of the groove, and the bottom of the housing is radially outward of and around the fastening band. And engages the second opening at the other axial edge of the groove,
Third and fourth tongues engaging on the edge have on their edges remote from the head of the clamping screw, the third tongue being provided on one side of the butt joint. ,
The fourth tongue is provided on the other side of the butt joint, and a portion of the third and fourth tongues is configured to be pressed radially outward of the bottom of the housing. , This problem is solved.

In its assembly, the positively mating connection of the ends of the housing band is such that the housing does not require welding between the ends of the housing band and the clamping band.
Provides that it is held together to prevent it from spreading. The first tongue is a tongue that is heavily loaded by the opening tension when using a right-hand tightening screw;
The wider width therefore resists greater opening tension when the worm drive clamp is tightened. Due to the position of these radial angles, the first and second tongues at the same time provide a circumferentially acting clamping force, and thus the position of the housing relative to the radially inner end of the clamping band is also dangerous. Help not to be. The radial angle configuration has the further advantage that the first and second tongues can resist a larger axial spreading force of the housing, in contrast to the inclined angle configuration. Further, the holes for accommodating the first and second tongues, when the clamp is tightened,
It can be clamped relatively to the tongue so that it bends against the tongue. Nevertheless, the tongue can be easily inserted into the opening of the clamping band on the assembly of the clamp without subsequent bending. Moreover, the tongue does not impede the insertion of the radially outer end of the clamping band into the housing. Also, the second opening axially holds the third and fourth tongues together, thus moving the end of the housing band over that end of the butt joint, away from the head of the clamping screw. Further hold. Pressing only a portion of the third and fourth tongues radially outward of the bottom of the housing has the following effects. The remaining portions of the third and fourth tongues projecting circumferentially beyond the edge of the bottom of the housing and remote from the head of the clamping screw,
It can be the corresponding short form. On the one hand it is still possible to engage beyond the radially inner edge of the second opening, and on the other hand away from the housing head, the waste of the sides of the housing or the edge of the housing band is kept to a minimum. You. Further, the third and fourth pressed
The crank-shaped configuration formed on a portion of the tongue stiffens the bottom of the housing at the edge in question.

The groove is pressed radially outward of the band.

[0009] The groove is bent substantially in the shape of a ridge roof in the circumferential direction of the clamp. In conjunction with the arrangement, the edges of the obliquely extending grooves in this case related to the circumferential direction serve to stiffen the edges of the grooves related to the clamping force.

A positive mating connection between the ends of the housing band is provided at one end of the housing band and extends toward the other end and has a plate portion having an undercut shape, and an undercut shape of the plate portion. And a recess at the other end having an undercut shape corresponding to
The plate part is appropriately coupled to the recess. This type of connection between the ends of the housing band is simple to make and also serves to hold the housing together, even if only slightly compared to the tongue.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS The invention and its developments are explained in more detail below with reference to the drawings of a preferred embodiment.

The illustrated worm drive clamp comprises a tightening band 1, a housing 2, a right-hand tightening screw 3 having a head 4 and a threaded shank 5. The fastening band 1 has circumferentially overlapping ends 6 and 7. The radially outer end 6 is provided with a threading element 8 in the form of a substantially axial rib which is pressed against the clamping band 1 and engages the threaded shank 5. The radially inner end 7 is the bottom 9 of the housing 2 surrounding the ends 6 and 7 and the clamping screw shank 5.
Connected in a positively engaged relationship. The housing 2
It carries a clamping screw 3 in both circumferential directions and has a housing band 10 whose ends are connected in positive engagement with the area of the bottom 9 along a butt joint 11 (see FIG. 2). On its radial inside, the radially inner end 7 of the fastening band 1 forms an axially continuous groove 12 for accommodating the bottom 9 of the housing 2.

The housing 2 is threaded free from the threading of the clamping screw 3 with the worm drive clamp fully assembled so that the clamping screw 3 in place on the housing 2 is not dangerous. ne
The lugs 13 and 14 are engaged with the annular groove of the ck portion). Furthermore, the head 4 of the clamping screw is arranged such that the tensioning force of the end 6 prevents the pivoting movement of the clamping screw 3 relative to the transverse direction of the clamping screw 3 so that the housing on the side of the clamping screw head 4 can be prevented. On the flange 15 projecting radially.

A positive mating connection between the ends of the housing band 10 is provided at one end of the housing band 10 and extends in the direction of the other end and has a substantially undercut shape in the shape of a hammer head. A plate or tongue 16,
It has an undercut shape corresponding to the undercut shape of the plate portion 16 and is substantially formed from the other end of the recess portion 17 having the plate portion 16 which appropriately engages with the recess portion 17.

At the edge towards the head 4 of the tightening screw, the bottom 9 of the housing 2 has a first tongue 18 on one side of the joint 11 and a second tongue 19 on the other side of the butt joint 11. And Both tongues 18 and 19 engage the first opening 20 at one axial edge of the groove 12 while leaning against each other. Opening 2
0 holds the tongues 18 and 19 together with the end of the housing band 10 in the area of the butt joint 11 and is on the side of the head 4 of the clamping screw. Therefore,
In addition to the positively engaged connection provided by the plate portion 16 and the recess 17, the housing 2 is not at risk for the axial opening effect when the clamp is tightened. The end 6 is placed in such a way that the area 6 is subjected to the highest load by the axial opening tension created by the frictional force between the clamping screw shank 5 and the radially outer end 6 of the clamping band. The tongue 18 is axially wider than the tongue 19 when it is deflected axially and thus pressed against one wall of the housing shown on the left in FIG. The tongue 18 can support the main part of the spreading force. Thus, the connection between the ends of the housing band adjacent to the tongues 18 and 19 can withstand the spreading forces of the tongues 18 and 19 greater than the same width.

In particular, the first opening 20 has the first and second openings.
The tongues 18 and 19 are bent radially outwardly and their free ends are substantially flush with and radially outward of the bottom of the groove 12 and are provided at the bottom of the groove 12. Thus, the tongues 18 and 19 provide a circumferential force and a clamping force which seeks to pull the housing 2, with which the bottom of the left housing of FIG.
Related to

Furthermore, at its edge remote from the head 4 of the clamping screw, the bottom 9 of the housing 2 is bent radially outward and circumferentially around the clamping band 1 and at the other axial edge of the groove 12 It has third and fourth tongues 21 and 22 that engage and engage on the edge of the second opening 23. The tongues 21 and 22 are the same size and are respectively located on each side of the joint 11. On the other hand, the housing 2 to be attached to the radially inner end 7 of the tightening band 1 and the tightening screw 3 are inserted into the housing 2 in the assembly process,
In particular, when opening the clamps, it is easy for the parts to be held together before they are stabilized in them by means of the axial lugs 13 and 14 in order to prevent them from rolling away. It is to be. On the other hand, it is further away from the head 4 of the clamping screw so as to further serve to hold the housing 2 axially together at the ends of the butt joints 11 and to be held together axially by the openings 23.

The groove 12 is pressed radially outward of the tightening band 1. The form is very simple. In addition, as shown in FIG. 6, the groove 12 is bent substantially in the shape of a ridge roof in the circumferential direction of the clamp or the tightening band 1. The arrangement of the edges 24 and 25 having a method of extending in a circumferentially inclined manner towards the free end of the radially inner end 7 of the clamping band 1 is such that the stiffening takes place in relation to the axial clamping force. Bring.

The parts of the tongues 21 and 22 are pressed radially outwardly of the bottom 9 of the housing so that only the short parts of the tongues 21 and 22 project circumferentially beyond their edges of the housing 2. And is remote from the head 4 of the clamping screw, so that there is relatively little waste for the housing band 10 with respect to the tongues 21 and 22 for their shape.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a worm drive clamp according to the present invention.

FIG. 2 is a side view of the housing of the worm drive clamp shown in FIG.

FIG. 3 is a side view of the housing of the worm drive clamp as seen from the side of the head of the clamping screw.

FIG. 4 is a side view of the housing of the worm drive clamp.

FIG. 5 is a cross-sectional view of one end of a tightening band of a worm drive clamp.

FIG. 6 is a plan view of the end portion shown in FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 fastening band 2 housing 3 clockwise fastening screw 4 head of fastening screw 5 threaded shank 6, 7 end 8 threading element 9 bottom of housing 10 housing band 11 joint 12 groove 13, 14 lug 15 flange 16 plate 17 Recesses 18, 19, 21, 22 Tongues 20, 23 Openings 24, 25 Lugs

Claims (4)

[Claims] 1. A tightening band (1) comprising a tightening band (1), a housing (2), a clockwise tightening screw (3) having a head (4) and a threaded shank (5). Are the overlapping ends (6,
7), the radially outer end (6) being provided with a threading element (8) which engages the threaded shank (5) and the radially inner end (6). 7)
Comprises a clamping screw (3) which surrounds said ends (6, 7) and said clamping screw shank (5) and is bi-directional
Are securely connected to the bottom (9) of the housing (2) which supports the housing (2), the ends of which define an butt joint in the area of the bottom (9) and are connected together The end (7) radially inward of the fastening band (1) is formed by deformation of the fastening band (1) and the housing (2). Having an axially continuous groove (12) for receiving the bottom (9) of the same on its radial inside, the bottom edge towards the head (4) of the clamping screw,
A first tongue (18) is provided on one side of the joint (11) and is in mutual contact with the first opening (20) at one axial edge of said groove (12). A worm drive clamp having an engaging second tongue (19) on the other side of the joint (11), wherein the ends of the housing band (10) are connected in positive engagement at the joint; The first tongue (18) with the housing (2) at the top, on the right hand side in the direction of insertion of the end (6) radially outside of the fastening band (1) within (2); ) Is axially wider than the second tongue (19), the first opening (20) is provided at the bottom of the groove (12), and the first and second Tongues (18, 19) are bent radially outward, The free end of al the groove (12)
The bottom (9) of the housing (2) is bent radially outward and circumferentially of the tightening band (1), radially outwardly of the bottom of the housing (2); The third and fourth tongues (21, 22), which engage the second opening (23) at the other axial edge of the groove (12) and engage on said edge, of the clamping screw The third tongue (21) has at its edge remote from the head (4), the butt joint (11)
And the fourth tongue (22)
Is provided on the other side of the butt joint (11), and a part of the third and fourth tongues (21, 22) is pressed radially outward of the bottom (9) of the housing. A worm drive clamp characterized in that the worm drive clamp is configured to be driven. 2. The worm drive clamp according to claim 1, wherein the groove (12) is pressed radially outward of the clamping band (1). 3. The worm drive clamp according to claim 1, wherein the groove (12) is bent substantially in the shape of a ridge roof in a circumferential direction of the clamp. 4. A positive mating connection between the ends of the housing band (10) is provided by the housing band (10).
A plate portion (16) provided at one end and extending toward the other end and having an undercut shape; and the other end having an undercut shape corresponding to the undercut shape of the plate portion (16). And (17) of
4. The worm drive clamp according to claim 1, wherein the plate part (16) is suitably coupled to the recess (17).