HK1148054B - Engagement unit for attaching and for engaging a threaded bolt - Google Patents

Description

Engagement unit for engaging a screw

Technical Field

The invention relates to an engagement unit for engaging a screw, which engagement unit is provided with a spring arm, on which a positioning means for engaging the screw is arranged.

Background

Document DE 3525865C 1 discloses such an engagement unit. The known engagement units are provided with spring arms on which a detent mechanism for engaging with a screw is provided. This enables the engagement unit to be pushed onto the screw in a simple manner.

Disclosure of Invention

It is therefore an object of the present invention to provide an engagement unit of the type mentioned at the outset which can be pushed onto the screw with a low setting force during operation and which, after the pushing process has ended, can also be subjected to a higher torque during operation in a further torque-proof manner.

The above object is achieved by such an engagement unit. The engaging unit for engaging with the bolt is provided with a spring arm, on which a positioning mechanism for engaging with the bolt is provided, characterized in that the engagement unit according to the invention is provided with an inner element and an outer element which can be pushed onto the inner element, which elements are so matched to each other, i.e. the outer member is pushed into position on the inner member, the spring arms provided on the inner member lock radially outwards with respect to the deflection, and, ensures that higher torques acting on the outer member during operation are transmitted to the inner member, the inner part is pushed onto the screw with a low insertion force in a first step during operation, and after the outer part has been pushed onto the inner part, torque is transmitted via the now locked spring arm, as is the case with screws on the inner part for tightening the engagement unit.

The torque receiving means according to the invention is advantageously formed by an edge piece which is arranged on the inner part and projects to the outside, and an edge piece receptacle which is arranged on the outer part and is formed to be complementary to the edge piece.

The invention is advantageous in that the inner part has a biasing means acting in the longitudinal direction counter to the insertion direction.

The invention is advantageous in that the biasing means is formed by a biasing spring directed away from the inner member.

The invention is advantageous in that positioning means are provided on the inner and outer element, which fixing means fix the outer element to the inner element in the axial direction relative to the advancing direction in the completed assembly set advanced onto the inner element.

The invention has the advantage that the positioning device has a positioning hook arranged on the inner part and a positioning groove arranged on the outer part, in which positioning hook the positioning hook engages in the completed assembly.

The invention has the advantage that the positioning slot is open to the outside and the positioning hook is accessible from the outside, so that the engagement of the positioning hook with the positioning slot can be released.

The invention has the advantage that the outer element is provided with an outer jacket in which the positioning groove is formed.

Drawings

Further suitable embodiments and advantages of the invention are explained below with reference to the exemplary embodiments shown in the drawings. The figures show that:

FIG. 1 is a perspective view of an embodiment of an engagement unit of the present invention having an inner member and an outer member longitudinally spaced from and connected to each other in a pre-assembly configuration;

FIG. 2 is a longitudinal cross-sectional view of the embodiment of FIG. 1 in a pre-assembled configuration;

FIG. 3 is a longitudinal cross-sectional view of the embodiment of FIGS. 1 and 2 in a complete installation set advanced onto a bolt;

fig. 4 is a perspective cross-sectional view of the embodiment of fig. 1-3 in the completed set-up arrangement of fig. 3.

Detailed Description

Fig. 1 shows a perspective view of an embodiment of the engagement unit of the invention provided with an inner member 1 and an outer member 2.

The inner part 1 is provided with a circular support disk 3 of disk-like construction having a centrally arranged introduction groove 4 for the introduction of a bolt, not shown in fig. 1. Advantageously, but not necessarily, further formed on the bearing disk 3 are oppositely disposed biasing tongues 5, 6 which extend in the circumferential direction and project in the axial direction beyond the bottom side of the bearing disk 3 facing the viewer in the schematic illustration of fig. 1 in the relaxed disposition state shown in fig. 1.

Furthermore, the inner part 1 is provided with two inner frames 7, 8 which are of cylindrical configuration throughout the entire enclosed basic structure, the diameter of which is smaller than the diameter of the bearing disk 3, which inner frames extend away from the bearing disk 3 in a direction away from the biasing tongues 5, 6. The outer circumference of the inner frame body 7, 8 is smaller than the outer circumference of the support disc 3.

Formed on the respective inner frame body 7, 8 are edge pieces 9, 10 of rectangular parallelepiped configuration, which are arranged opposite one another, the longer sides of which extend in the longitudinal direction of the inner part 1 and are arranged at a distance from the bearing disk 3. A pair of opposing positioning hooks 11, 12, 13, 14 is respectively provided between the end of the edge pieces 9, 10 facing the support plate 3 and the support plate 3. The latching hooks 11, 12, 13, 14 extend outward and project beyond the plane of the edge pieces 9, 10 perpendicular to the circumferential direction.

Furthermore, in the exemplary embodiment shown, the inner part 1 is provided with two oppositely disposed spring arms 15, 16, which are each disposed substantially centrally between the edge blocks 9, 10 between the inner carriers 7, 8. In an embodiment not shown, it is also possible to provide more spring arms than two spring arms 15, 16.

The outer part 2 has a circular outer jacket 17 of disk-like configuration and a flanged head 18 formed on the outer jacket 17 for transmitting torque, which flanged head is provided, for example, in the outer hexagonal configuration shown in fig. 1 or in another geometry for engagement with a further tool. In the outer jacket 17, pairs of detent grooves 19, 20, 21, 22 are provided, which are arranged opposite one another and extend in pairs past the outer jacket 17 and are arranged to engage in each case one detent hook 11, 12, 13, 14.

As can also be seen from fig. 1, the outer component 2 is provided on the one hand with edge block receptacles 23, 24 for receiving the edge blocks 9, 10 in a precisely fitting manner in the circumferential direction; inner frame receiving portions 25, 26 for receiving the inner frames 7, 8; spring arm receptacles 27, 28 are also provided for receiving the spring arms 15, 16 in a precisely matched manner in the radial and circumferential directions.

Fig. 2 shows a longitudinal section through the embodiment of fig. 1, wherein the section passes centrally through the spring arms 15, 16. As can be seen from fig. 2, the spring arms 15, 16 are each formed in a resilient manner in the radial direction with a resilient section 29 which has a lower material strength in relation to the regions of the other spring arms and is arranged close to the bearing disk 3. Each spring arm 15, 16 has a detent projection 30, 31 as a detent means, which projects radially inward into a bolt receptacle chamber 32, which is enclosed by the inner body 7, 8 and the spring arm 15, 16. In an embodiment not shown, each spring arm 15, 16 may also be provided with more than one positioning projection 30, 31 as a positioning mechanism.

As is apparent from fig. 2, in the pre-assembly arrangement shown in fig. 1 and 2, the inner member 1 and the outer member 2 are arranged at a constant interval in the axial direction. For example, the inner member 1 and the outer member 2 can be connected to each other by at least one connector, not shown in fig. 1 and 2, or can be preassembled as two separate members, which connector has a relatively low resistance with respect to the propulsion forces. In the exemplary embodiment shown in fig. 1 and 2, the edge block receptacles 23, 24, the inner holder receptacles 25, 26 and the spring arm receptacles 27, 28 extend completely through the outer part 2 in the longitudinal direction, so that the outer part 2 can also be moved in the longitudinal direction relative to the inner part 1, possibly after interference by the or each connection, until the outer jacket 17 rests against the support disk 3.

Fig. 3 shows a longitudinal section through the plane of the spring arms 15, 16 in the embodiment of fig. 1 and 2 in the assembled configuration in engagement with the screw 33 fixed to the support 34. As can be seen from fig. 3, for example, in order to fasten the attachment part 35 to the support part 34, the screw 33 is passed through the latter, during the displacement of the inner part 1, the spring arms 15, 16 are pushed out by means of a lifting/rotating tool, which bears on its front face against an outer jacket, which projects radially beyond the flange head 18, with the positioning projections 30, 31 in the pre-assembly arrangement shown in fig. 1 and 2, against the screw 33, while passing the external thread 36 formed on the screw 33, until the bearing disk 3 finally bears against the attachment part 35. Here, the biasing tongues 5, 6 provide a height balance, so that the biasing tongues hold the inner member 1 with a certain biasing force in a position in which the positioning protrusions 30, 31 engage with the external thread formation 36.

In the advanced arrangement of the engagement unit according to the invention, the outer part 2 is advanced longitudinally onto the inner part 1 from the pre-assembled arrangement shown in fig. 1 and 2 until the outer jacket 17 abuts against the bearing disk 3. In this completed assembly, it can be seen from fig. 3 that the spring arms 15, 16 ensure that the radially outward ejection is prevented by the contact with the radially outward-directed side walls of the spring arm receptacles 27, 28 and by the contact with the ends of the spring arm receptacles 27, 28 which are arranged laterally adjacent to the spring arms 15, 16 in the circumferential direction, so that a high pull-out force is ensured by the positive engagement of the latching projections 30, 31 with the external thread arrangement 36.

Fig. 4 shows a perspective view of a longitudinal section through the edge block 9 of the exemplary embodiment of an engagement unit according to the invention from fig. 1 to 3 in the completely assembled arrangement from fig. 3, wherein the section is parallel to the radially outwardly pointing plane of the edge block 9 and runs through the latching hooks 11, 12 arranged between the edge block 9 and the support plate 3. As can be seen from fig. 4, the latching hooks 11, 12 are accessible from the outside, for example with a longitudinal component, so that when a corresponding force is exerted on the latching hooks 11, 12, 13, 14, the latching hooks 11, 12, 13, 14 are released from their engagement with the latching recesses 19, 20, 21, 22, and the outer component 2 can be removed again from the inner component 1 by moving it away from the bearing disk 3.

It is also apparent from fig. 4 that the edge blocks 9, 10 rest with their outer surfaces in the circumferential direction against the surfaces of the edge block receptacles 23, 24 arranged opposite the edge block surfaces, so that, for example, when a torque is applied to the flange head 18 by means of a tool, the torque is transmitted to the inner part 1 by the engagement of the edge blocks 9, 10 with the outer part 2, and the engagement unit according to the invention can be tightened, similar to a screw, in order to fix the attachment 35 to the support 34 with a certain pressure. In the event of a torque corresponding against the thread direction of the external thread arrangement 36, the inventive engagement unit is unscrewed in the use situation like a nut, thereby enabling the attachment 35 to be removed from the support 34. Suitably, the outer member 2 is then detached from the inner member 1 as described above, so that the engagement unit of the invention can be used again according to the specific situation.

Claims (5)

1. An engagement unit for mounting and engagement with a bolt (33), provided with spring arms (15, 16) on which positioning means (30, 31) for engagement with the bolt (33) are provided, characterized in that the engagement unit is provided with an inner part (1) and an outer part (2) which can be pushed onto the inner part (1), wherein the spring arms (15, 16) are provided on the inner part (1) and, in a fully assembled configuration in which the outer part (2) is pushed onto the inner part (1), are locked radially outward by a spring arm receptacle (27, 28) of the outer part (2) with respect to movement, wherein torque receptacles (9, 10, 23) are provided on the inner part (1) and on the outer part (2), 24) In a complete assembly of the outer part (2) onto the inner part (1), the torque receiving means are in engagement with one another in order to achieve a rotationally fixed connection of the outer part (2) to the inner part (1), and wherein a flange head (18) is provided on the outer part (2) and is provided for the use of a tool which can generate torque, the torque receiving means being formed by edge blocks (9, 10) which are arranged on the inner part (1) and project outwards, and edge block receptacles (23, 24) which are arranged on the outer part (2) and are configured complementarily to the edge blocks (9, 10), positioning means (11 to 14, 19 to 22) being provided on the inner part (1) and on the outer part (2), the positioning device has positioning hooks (11, 12, 13, 14) arranged on the inner component (1) and positioning grooves (19, 20, 21, 22) arranged on the outer component (2), wherein a pair of positioning hooks (11, 12, 13, 14) opposite to each other are respectively arranged between the end of the edge block (9, 10) facing the support disc (3) and the support disc (3), wherein the positioning hooks (11, 12, 13, 14) extend outwards and protrude out of a plane of the edge block (9, 10) perpendicular to the circumferential direction, and in the finished assembly arrangement, the positioning hooks (11, 12, 13, 14) engage in the positioning grooves, the positioning grooves (19, 20, 21, 22) are open outwards, and the positioning hooks (11, 12, 13, 14) are accessible from the outside, so that the positioning hooks and the positioning grooves (19, 21, 14) can be released, 20. 21, 22), the outer member (2) being provided with an outer jacket (17), the detent hooks (11, 12, 13, 14) extending outwardly, the detent grooves (19, 20, 21, 22) extending through the outer jacket (17) arranged opposite one another.

2. The engagement unit according to claim 1, characterized in that the inner member (1) has a biasing means (5, 6) acting in the longitudinal direction opposite to the nesting direction.

3. An engagement unit according to claim 2, characterized in that the biasing means are constituted by biasing tongues (5, 6) directed away from the inner member (1).

4. The engagement unit according to claim 1, characterized in that in the completed assembly set advanced onto the inner member (1), the positioning means fix the outer member (2) to the inner member (1) in an axial direction relative to the advancing direction.

5. The engagement unit according to claim 1, characterized in that the positioning slot (19, 20, 21, 22) is formed in the outer jacket.