RU182959U1 - Worm clamp - Google Patents

Abstract

The utility model relates to the field of mechanical engineering, namely to worm screw clamps, which can be used to connect hoses or hoses in various designs related to the automotive, shipbuilding, machine tool, aviation and household industries. The clamp includes a tubular body (1) made of a sheet metal billet and having a paraboloidal upper part (4) and a lower flat part (5) formed by the bent ends (6) bent into the body to form a longitudinal joint (7); a screw (2) installed in the housing (1); and rolled into a ring a metal tape (3), the ends (8.11) of which are placed in the body (1), while the first end (8) of the tape is spot-welded to the lower part of the body, and the second end (11) is equipped with a gear track ( 12) meshed with the threaded portion (15) of the screw. An annular groove (17) is made in the screw (2) on the head side (14), and the corresponding edge (18) of the upper part (4) of the housing end (1) is bent and placed in the indicated annular groove (17) to ensure its girth. The bent ends (6) of the lower part (5) of the housing (1) are connected with each other and with the first end (8) of the tape with only one spot weld (9) made by flash welding. The ratio of the diameter (D) of the tape ring (3) and the length (L) of the longitudinal joint (7) of the lower part (5) of the housing (1) is from 1.5 to 15. The technical result is an increase in the breakdown torque of the threaded joint of the clamp. 4 s.p. f-ly, 5 ill.

Description

Technical field

The utility model relates to the field of mechanical engineering, namely to worm screw clamps, which can be used to connect hoses or hoses in various designs related to the automotive, shipbuilding, machine tool, aviation and household industries.

State of the art

The closest analogue of the utility model is the worm clamp described in the patent of the Russian Federation for utility model No. 124355, 01/20/2013. The clamp contains a housing having upper and lower sections, in which a threaded rod of a hexagon screw with a cross and a slot is installed. In the lower section of the casing, the ends of a flexible metal strip rolled into a ring are placed, one of which is equipped with stops for fixing the casing, and on the other end there is a gear track meshed with the screw threaded rod. The edges of the tape are rolled to the outside of the ring and machined. The edge of the housing end from the side of the hexagonal head of the screw is bent and placed in an annular groove made on the screw shaft from the side of its hexagonal head, grasping the annular groove along its inner diameter below the axis of the screw. The body is made of stamped steel billet. The upper body section has a paraboloidal cross-sectional shape with the lower parts bent inward, forming a flat lower body section with a longitudinal seam, the length of which in the longitudinal section is less than the length of the upper paraboloidal part of the body. In this case, the lower flat portion of the housing is fixed with the end of the tape, equipped with stops, spot welding at the location of the longitudinal seam.

The main disadvantage of the analogue is the presence of a longitudinal weld connecting the lower curved parts of the body. The implementation of an extended seam leads to prolonged heating of the connected parts, which in turn can lead to irregularities. Further formation of a spot weld connecting the body and the overlap only worsens the situation and can lead to distortion of the shape of the body, which negatively affects the strength of the connection and the maximum tightening torque of the clamp, since with an increase in the tightening force, there is a risk of failure of the threaded joint. In addition, the analog does not take into account the geometric parameters of the connection section of the housing with the tape, which have a significant impact on the quality of the connection.

Utility Model Disclosure

The objective of the claimed utility model is to eliminate the disadvantages of analogues and create a simple and reliable design of the worm clamp

The technical result of the utility model is to increase the breakdown torque of the threaded joint of the clamp.

The specified technical result is achieved in a utility model due to the fact that the clamp contains a tubular body made of sheet metal workpiece and having an upper part of a paraboloidal shape and a lower flat part formed by the ends of the workpiece bent into the body with the formation of a longitudinal joint; screw installed in the housing; and a metal strip rolled into a ring, the ends of which are placed in the housing, the first end of the tape being spot-welded to the lower part of the housing, and the second end equipped with a gear track meshed with the threaded part of the screw; moreover, in the screw from the head side an annular groove is made, and the corresponding edge of the upper part of the end face of the body is bent and placed in the specified annular groove to ensure its girth, the curved ends of the lower part of the body are connected to each other and to the first end of the tape with only one spot welded joint lap welding; the ratio of the diameter of the ring of the metal tape and the length of the longitudinal joint of the lower part of the housing is from 1.5 to 15.

In addition, according to private options for implementing the utility model:

the ratio of the height of the protrusion of the upper part of the body and the depth of the annular groove of the screw is from 1.5 to 2.5;

the screw head is hexagonal and has a slot for a screwdriver;

the first end of the tape is provided with stops for fixing the lower part of the housing;

the edges of the tape are rolled to the outside of the ring.

Unlike the closest analogue, in the design of which there is a longitudinal weld that connects the body parts and a spot weld that connects the body to the tape, in this solution, only one spot weld is used, which is performed by contact welding, which connects the ends of the lower part of the body as well as with tape.

Performing contact welding at only one point without forming a longitudinal seam reduces the time of thermal action on the connected elements and significantly reduces the risk of their deformation, which leads to an increase in the value of the breakdown torque of the threaded connection of the screw and tape in view of preserving the given geometry of the case. At the same time, as tests have shown, the performance of resistance welding at one point is sufficient for the clamp to withstand standard loads during installation and operation.

The choice of the ratio of the diameter of the ring of the metal tape to the length of the longitudinal joint of the lower part of the housing, equal to 1.5-15, is also due to the issue of deformation of the clamp elements. If the ratio is less than 1.5, welding at one point will not provide a reliable fixation of the tape on the body without displacements due to the large length of the lower flat part of the body in contact with the essentially cylindrical surface of the tape. At the same time, tightening such a clamp can lead to deformation of the tape and the body. If the ratio of the parameters is more than 15, the length of the lower part of the housing with respect to the diameter of the tape will be too small, which can lead to deformation of the housing in the lower part under operational loads.

Thus, the above features ensure the achievement of a technical result, which consists in increasing the torque of failure of the threaded connection of the clamp.

These particular cases of the implementation of the utility model are also aimed at achieving this technical result. However, these particular cases are not the only possible forms of embodiment of the proposed design, but show the most preferred, from the point of view of this result, options.

In particular, the choice of the parameters of the bending of the housing and the grooves of the screw is due to the following. When assembling the clamp, a screw is screwed into the housing first, while the second end of the tape is in a free position so that the screw freely enters the housing along the thread without any interaction between the bent edge and the screw groove. Then, when tightening the clamp, the second end of the tape enters the housing, tightening the screw to the upper part of the housing so that its protruding edge enters the groove, forming a connection that additionally prevents the breakdown of the screw and its exit from the housing. In addition, this bend prevents the screw head from entering the housing. When the ratio of the height of the upper part of the body to the depth of the annular groove of the screw is less than 1.5, the fixation of the protrusion in the groove may not be reliable enough. On the other hand, exceeding the specified ratio of more than 2.5 can create difficulties during the initial screwing of the screw into the housing, which in turn can lead to deformation of the upper part of the housing. Those. the specified ratio allows you to guaranteedly preserve the given geometry of the elements, and to provide a high value of the torque of failure of the connection. However, its observance is not strictly required, since reliable retention of the screw in the housing is ensured mainly due to the threaded connection.

Brief Description of the Drawings

The design of the claimed clamp is illustrated by drawings, where:

in FIG. 1 shows a side view of a clamp;

in FIG. 2 shows a front view of a clamp;

in FIG. 3 shows the connection point of the lower part of the housing with the tape bottom view;

in FIG. 4 shows a housing structure;

in FIG. 5 shows the design of the screw.

The clamp elements are indicated in the drawings by the following positions:

1 - housing

2 - screw

3 - tape

4 - the upper part of the body,

5 - the lower part of the housing,

6 - ends of the lower part of the housing,

7 - longitudinal joint,

8 - the first end of the tape,

9 - seam of spot welding,

10 - emphasis

11 - the second end of the tape,

12 - gear track

13 - the edges of the tape,

14 - screw head,

15 - threaded part of the screw,

16 - screw slot

17 - ring groove of the screw,

18 - curved edge of the housing.

Utility Model Implementation

The claimed clamp contains a tubular body (1), a screw (2) installed in the body and a metal tape (3) rolled into a ring, the ends of which are placed in the body.

The housing (1) is made of sheet metal billets, processed by stamping with the formation of the upper part (4) having a paraboloidal shape, and a flat lower part (5), which is formed by the free ends (6) bent inward bent with the formation of a longitudinal joint (7) . The length (L) of the specified longitudinal joint (7), which determines the length of the lower part (5) of the housing (1), and the diameter (D) of the tape ring (3) satisfy the ratio: L / D = 1.5-15. The length of the longitudinal joint, as a rule, is less than the length of the upper part (4) of the housing (1).

For the manufacture of the housing (1), in particular, steel, aluminum alloys, etc. can be used.

The first end (8) of the metal strip (3) is in contact with the inner surface of the lower part (5) of the housing (1) and is connected to it by welding. In this case, a single spot welding seam (9) is provided, which is overlapped by contact welding (at one point). The specified seam (9) is located on the line of the longitudinal joint (7) and connects the ends (6) of the lower part (5) of the housing (1) and the first end (8) of the tape (3). To ensure a more reliable fixation on the first tape at the edges of the lower part (5), stops (10) can be made that prevent the housing (1) from displacing. The emphasis (10) can be formed by extruding (knocking) the material in small sections of the tape.

The second end of the tape (11) is equipped with a gear track (12), which ensures the tightening of the clamp. The specified track (12) is made on the outer surface of the specified end (11) of the tape. In this case, the inner surface is preferably kept smooth (in Fig. 3, the track is shown for clarity), which ensures the tightening of the clamp without damage and increases the reliability of the connection.

To avoid cuts of the connecting sleeve or hose, the edges (13) of the tape can be rolled to the outside of the ring and protected from burrs.

The screw (2) has a head (14) and a rod with a threaded part (15), which is engaged with the toothed track (12) of the tape (3).

The screw head (14) is preferably hexagonal and has a straight, cross-shaped or combined slot (16) for a screwdriver.

An annular groove (17) is made in the screw shaft from the head side (14). At the same time, the edge (18) of the upper part of the end-face case is bent and placed in the indicated annular groove (17), ensuring its girth below the axis of the screw (2).

In a preferred embodiment of the utility model, the height (H) of the protrusion of the upper part (4) of the housing (1) and the depth (B) of the annular groove (17) (the distance from the rod to the protruding threaded part) of the screw (2) are determined by the ratio: H / B = 1.5-2.5.

When mounting the clamp, the second end of the tape is placed in the housing and is tightened around the connected part by means of a screw.

Claims (11)

1. A worm clamp containing: a tubular body (1) made of sheet metal workpiece and having an upper part (4) of paraboloidal shape and a lower flat part (5) formed by the ends (6) of the workpiece bent into the body with the formation of a longitudinal joint (7); a screw (2) installed in the housing (1); and a metal tape rolled into a ring (3), the ends (8.11) of which are placed in the body (1), while the first end (8) of the tape is spot-welded to the lower part of the body, and the second end (I) of the tape is equipped with a gear track ( 12) meshed with the threaded portion (15) of the screw; moreover, in the screw (2) from the side of the head (14) an annular groove (17) is made, and the corresponding edge (18) of the upper part (4) of the end face of the housing (1) is bent and placed in the specified annular groove (17) to ensure its girth, characterized in that the bent ends (6) of the lower part (5) of the housing (1) are connected with each other and with the first end (8) of the tape by only one spot weld (9) made by flash welding with overlap, the ratio of the diameter (D) of the tape ring (3) and the length (L) of the longitudinal joint (7) of the lower part (5) of the housing (1) is from 1.5 to 15. 2. The clamp according to claim 1, characterized in that the ratio of the height (H) of the protrusion (18) of the upper part (4) of the housing (1) and the depth (B) of the annular groove of the screw is from 1.5 to 2.5. 3. The clamp according to claim 1, characterized in that the head (14) of the screw (2) is hexagonal and has a slot (16) for a screwdriver. 4. A clamp according to claim 1, characterized in that the first end (8) of the tape (3) is provided with stops (10) for fixing the lower part (5) of the housing (1). 5. The clamp according to claim 1, characterized in that the edges (13) of the tape (3) are rolled to the outside of the ring.

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