JPS6039076A - Rotary tool - Google Patents

Abstract

1. Torque applying tool comprising a rotary head (16) adapted to be applied to a workpiece, a hydraulic cylinder (10) whose piston (12) is connected via a hinge means (14, 15, 17) to a first pivot point (15) of the rotary head (16), an arm (30) supported at the cylinder housing (11) of the hydraulic cylinder (10), and connected to a second pivot point of the rotary head (16) via a second hinge (34) which - with respect to the axis of the rotary head (16) - is provided at an angular distance to the first pivot point (15), and a supporting member (37) for supporting the cylinder housing against a stationary abutment, characterized in that the arm (30) is fixed rigidly and dismountably at the cylinder housing (11), that the hinge means (14, 15, 17) is so designed that it adapts itself to swivel movements of the first pivot point (15) relative to the cylinder axis, and that at least one further arm (30a) is provided which is distinguished from the first arm (30) by a different arrangement of the pivot point for the second hinge (34) with respect to the cylinder housing, and which is interchangeable against the first arm (30).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a rotary head that can be placed above a workpiece and a hydraulic syringe that is inserted with a piston connected to a first point of articulation of the rotary head via an articulated fixture. an arm fixed to the cylinder housing of the hydraulic cylinder and connected to a second articulation point of the rotary head via a second joint of the rotary head; On the other hand, a known rotary tool of this type is used for turning a male screw (DB-PS2654466). This rotary tool has a rotary head that is applied to the head of the external screw to be turned. The piston rod of the hydraulic cylinder is attached to the rotating head via a first joint.

An arm, which is flexibly connected at the rear to the cylinder housing of the hydraulic cylinder, is attached to the second joint of the rotary head.

Hydraulic cylinders are supported against stationary bearing surfaces.

and an oscillating support mechanism for directing the reaction force generated while tightening the screw.

An advantage of the known rotary tool is that there is no need to enclose the rotary head in a housing that is rigidly connected to the hydraulic cylinder or in an envelope surrounding the hydraulic cylinder. The rotating head requires no support or housing and is held firmly relative to the hydraulic cylinder by the piston rod and arm. However, if the arm, which is flexibly connected at one end to the rotating head and flexibly connected at the other end to the cylinder housing, tightening the external thread does not allow the cylinder housing to move during operation. Since it cannot be guided, the cylinder housing must be guided only by the piston.

Rotary tools for tightening and loosening external threads are also known, which have a cylinder housing with a separate envelope part containing a rotary head. One end of the piston rod is flexibly connected to the piston, and the other end is flexibly connected to the rotating head. However, the separate envelope housing the single-turn head makes this rotary tool a very heavy and costly construction.

Honsha @Hikima, does not have an envelope surrounding the J-turn head.

To this end, the cylinder housing is fixed in a spatially aligned manner on the second joint, with the aim of obtaining a rotary tool of the type described above, which is configured for precise guidance.

To achieve this objective, the invention provides an articulation device for fixing the arm to the cylinder housing and for pivoting the first articulation point with respect to the axis of the cylinder. .

In the rotary tool of the present invention, the arm connected to the rotary head via the second joint is fixed to the cylinder housing. For this purpose, the position of the second joint relative to the cylinder housing is fixed, but a horizontal pivoting movement of the arm and the cylinder housing about the axis of the second joint is possible. In order to prevent the hydraulic cylinder from jamming during the stroke, the piston is connected to the articulation point of the rotary head in such a way that the articulation point is always on the axis of the cylinder.

The rotary tool of the invention is particularly suitable as a power screwdriver for tightening and loosening external threads, but can also be used for turning pipes, for example. In the simplest case, the rotating head has a hexagonal hole that can be placed over the head of the male screw to turn it. The rotating head is a rectangular hole into which, for example, the rectangular shaft of a key nut is inserted.

Alternatively, it can also have a keyway meat system.

If the rotary head consists of a single ring with a non-circular hole, after each stroke of the hydraulic cylinder the rotary head must be moved over the head of the external thread before the next stroke can be made.

So that you don't have to move the rotating head that way.

The rotary head can have a ring connected to the rotary tool and fixed against rotation.

The ring is not housed within the outer ring, and when rotating in one direction it is moved by the outer ring by a ratchet mechanism, but when rotating in the other direction the outer ring drives the inner ring. Go back to normal without any trouble. During continuous operation of the hydraulic cylinder, the inner ring is moved in only one direction by a ratchet mechanism, with the piston rod and arm engaging the outer ring such that the outer ring is periodically rotated back and forth.

A rotary tool according to the invention, in which the arm, which is flexibly mounted on the rotary head, is fixed to the housing of a hydraulic cylinder, can be used for various needs. According to a preferred embodiment of the invention, several different arms are provided for different arrangements of the second coupling relative to the cylinder housing, which arms are mounted interchangeably on the cylinder housing. Depending on the respective space conditions in the vicinity of the workpiece to be processed for this purpose and the required torque combined in a single hydraulic cylinder (which represents the basic unit), several arms can be selected. The possibility exists to use one of the arms.

The arms are preferably mounted at various positions along the length of the cylinder housing. It is also possible to change the structure of the rotary tool depending on the mounting position of the arm so that the rotary tool of the present invention can be incorporated to some extent into several types of devices.

For applications in which a variety of devices must be used, it is now possible to use a single device that is modified by changing the arm or by changing the attachment position of the arm to the hydraulic cylinder.

According to a preferred embodiment of the invention, several different rotating heads are provided for different relative arrangements of the articulation points of the first and second joints. This provides the advantage that the hydraulic cylinders forming the basic unit can be connected to various rotary heads, making them versatile. For that purpose, a kind of kit will be obtained with a single hydraulic cylinder and several rotating heads and arms that can be combined with each other.

The rotary tool can be further modified for use in special applications because the lever arm can be fixed to several attachment points on the rotary head. The articulation fixture and arm can be flexibly mounted to the member arm at various distances from the axis of the rotating head. A lever head can further be attached to the rotating head. A piston rod and a hydraulic cylinder arm are attached to the lever arm. Therefore, it is possible to turn the head of the male screw and other workpieces when there are obstacles nearby. A lever arm projecting from the rotating head extends over a small circumferential angle of the rotating head. Since the arm and the piston rod are attached to the lever arm at a relatively large radial distance from the rotating head, in particular the arm attached to the hydraulic cylinder does not extend into the area of interfering obstacles.

In a preferred embodiment of the invention, the arm is connected to the cylinder housing by two removable shafts. This type of connection allows the arms to be easily replaced on the cylinder housing. However, other removable connections can also be selected. For example, it is possible to use an at-on housing in which the arm is fixed and can be connected to the cylinder housing, or a guide rail that supports the arm and works with a corresponding counterrail of the cylinder housing. In the simplest case, it is also possible to screw the arm onto the cylinder housing for compatibility.

The present invention will be described in detail below with reference to one drawing.

The rotary tool shown in Figs. 1 and 2 has a cylinder housing 10.
has. The piston 1 inside the cylinder housing 11
2 can move. The piston 12 has a tubular lug 1
3 is installed. This lug 13 extends through a sealed hole provided on one side of the cylinder housing 11. A piston rod ]4 extends through the lug 13. The outer end of the piston rod 14 is connected to a rotating head 16 by a first joint 15 . A further joint 17, in the present case configured as a ball joint, connects the inner end of the piston rod 14 to the lug 3 and to the piston 12. The tubular lug 3 surrounds the piston rod 14 with a radial offset, so that the piston rod 14 can pivot about the joint 17 within the space of the lug 13.

Passages 18, 19 extend within the walls of the cylinder housing. The passage 18 starts from the rear wall side and connects to the rear cylinder.
Ends in space 21. The passage 19 starts from the rear wall 20 and ends in the front cylinder space 22. As can be seen from FIG. 2, the connection point of the passage 18 is in the center of the rear wall, and the connection point of the passage 19 is off-center, i.e. near one corner of the cylinder housing 11. . The cross section of the cylinder housing 11 is hexagonal over its entire length. One of the passages 18 and 19 is connected to a pressure pipe, and the sacral side of O'L1 is connected to a reversing valve.
lve) (not shown) to an unpressurized return pipe, so that the piston]2 can be advanced and retracted periodically within the cylinder spaces 21,22. The front end of the cylinder space η is closed by a wall 23. A hole is provided in this wall, into which the lug 13 of the piston 12 is inserted. The hole and lug 13
The holes are provided with seals 24 to prevent foreign objects from entering the cylinder space through the gaps between them.

Two pairs of parallel plates 5, 26 project from the outside of the cylinder housing 11. There is a gap between a pair of parallel grooves 5 disposed on the front end of the cylinder housing 11. Further, there is also a gap between a pair of parallel pins provided at the rear end of the cylinder housing 11. Parallel plates 5, 26 are provided with holes 27 for passing bolt paths. Each bolt 28 has a ring groove surrounding the outer diameter of the bolts 5 and 26. A fixing ring 4 is fitted into the groove,
(pol) 28 so that it does not fall out from the hole 27.

The parallel plate 26 is the arm attachment cylinder housing 11
It functions to attach to. The arm 30 is made of a steel plate and is fitted between the front flaps 5.

A hole 31 is provided in the arm joint, and the front bolt path is inserted into the hole 31. The thickness of the rear end portion 32 of the arm located between the rear plates 26 is approximately half the thickness of the arm (9), and a hole 31 through which the fold door passes is provided.

The bolt path forms a removable axis for mounting the cylinder housing IIK in such a way that the arm can be removed.

The middle part and the connecting part of the arm are cylinder/%Using 11
, but the front part 33 of the longitudinal axis of the cylinder housing 11 is sharply curved. The front end of the front part 33 is the second
It is connected to the rotating rod 16 via a joint 34 .

The rotating head 16 consists of a ring 35 with a non-circular recess, in this case a hexagonal recess.

The ring can be placed over the head of the male thread.

In relation to the @ line of the rotation throat 16, the two joints 15° 34 are arranged at an angle from each other. To simplify the construction of the embodiment described here.

Although the rotating head 16 is shown without a ratchet, it is preferable to provide the rotating head 16 with a ratchet, as described above.

The reaction force from the cylinder housing 11 is absorbed by the stationary receiving surface (
(not shown).
A swing support arm 37 is provided. Between the thin ends of the support arm is the end 32 of the arm (g) and the plate 26.
It is placed between the holes, and for that purpose a hole is drilled through which the pole 28 is passed. The support arm 37 is pivotable about the bolt 38 and its free end lies f+ against a stationary bearing surface.

During use of this rotary tool, cylinder space 21 is under pressure and cylinder space 4 is not. To this end, the piston rod 14 is pushed out of the cylinder housing 11 and tries to turn the rotary head 16 counterclockwise via the first coupling 15 . At the same time, the arm (
9) pulls the rad 16 into rotation via the second joint, which also generates a counterclockwise torque. In this way, when the rotary rod 16 rotates counterclockwise, the cylinder housing 11 swings clockwise about the second joint 34), and at the same time, due to the corresponding movement of the second joint 34. , it is moved to the rear. Cylinder·
Since the oscillating support arm 37 attached to the housing 11 is accommodated for all oscillation and translation movements, the support arm 37 is longitudinally stressed (compressed).
Only.

Instead of the support arm 37, a pair of support rollers 39 are provided in the embodiment shown in FIG. These support rollers are supported on the outer extension axis of the plate. A thin section 32 of arm I is used to fill the space between the plates.
In addition, a spacer 40 is also placed. For support, one roller 39 is placed with its circumference against a stationary abutment surface, on which it rolls during the reciprocation of the piston.

When using a swinging support arm 37 and when using support rollers 39, support is provided by low-friction rocking or shifting. In other words, since the rubbing surfaces are supported without pressing against each other, losses due to support and wear of the support member are small.

As shown in FIG. 1, arm I can be fixed in two positions on the cylinder housing. This is possible because, in addition to the hole 31, a hole 31' can be provided on the side opposite from the hole 31 in the longitudinal direction of the arm. If the arm is bolted into hole 31' instead of hole 31, the front part 33 of arm (9) extends further forward, resulting in a different transmission and motion ratio. It turns out. It is also possible to rotate the arm so that the front or shoulder 33 does not extend outwardly, but forms an angle with the axis of the cylinder housing 11. By attaching the arm (9) to the cylinder housing 11 in different ways, various rotating tools can be obtained.

In the embodiment shown in FIG. 4, the support 41 is attached to the cylinder housing 11 rather than to the pair of plates 5 or plates. These supports 41 are superimposed on both sides of an arm (9)' having a U-shaped cross section. The arms themselves overlap on either side of the forked ends of the support arms. Bolts (not shown) are pushed into mutually flush holes provided in the support body 41, on both sides of the arm sleeves, and in the support arms 37'.

FIG. 5 shows another method of attaching the support arm I" to the cylinder housing 11. In this method,
The cylinder housing 11 has two parallel L-shaped rules 4.
2, the free sides of the rails being inclined towards each other towards the other rail. The arm (g) is inserted between the rails 42.

The arm I'' is fixed by a male screw 43 screwed into a screw hole in one of the rails 42. The male screw 43 is securely held in a blind hole in the arm I''.

A support arm 37'' is supported on one axis 44 of arm 30''. Arm 37'' projects through the space between the two rails 42.

FIG. 6 shows an embodiment in which the same hydraulic cylinder 10 shown in FIG. 1 is used with a different rotational radius 16 and a different arm 30a. In the case of the rotary rod 16a, the distance between the articulation points for the first joint 15 and the second joint is shorter than the distance between the articulation points of the same joint in the case of the rotary rod 16. Arm 30a is straight over its entire length. In the embodiment shown in FIG. 6, the torque applied by the hydraulic cylinder 10 to the rotary head 16 is less than the similar torque in the embodiment shown in FIG.
Since a narrower gap is required in the vicinity of 6a, the rotary head 16a can be used against the head of an external thread even if the movement of the rotary head 16 shown in FIG. 1 is restricted by external obstacles. FIG. 6 shows a support roller 39 attached to a bolt passing through the plate. Instead of the support roller 39, a swinging support arm 37 can also be used, as shown in FIG.

In the embodiment shown in FIG. 7, the same hydraulic cylinder 10
Again, an example is shown in which the rotary head 16a of FIG. 6 and the arm 30 (or the arm 30 of FIG. 1) are used.
In this embodiment, the torque arm of the rotary head 16a is extended by a triangular lever arm 45 fixed to the rotary head 16a and extending radially therefrom.

The lever arm 45 is connected to articulation points 47, 48.

Their connection points 47, 48 form parts of the first joint 15 and the second joint, respectively, of the embodiment shown in FIG. Their points of articulation 47 , 48 are connected to the lever arm 45
It is composed of holes corresponding to holes 49 and 50 provided in , respectively, and bolts (not shown) are passed through these holes. A hole 52 is provided at the outer end of the arm. Its outer end is flexibly connected to the end of the piston rod 14 to form a first joint. Another hole 51 is provided in the lever arm 45. That hole is arm 3Q
a (4 or arm 30 in FIG. 1) is flexibly connected to the front end to form a second joint.

The lever arm 45 is in a sense a radial extension of the rotary head 16a, and is a radial extension of the rotary head 16a, which connects the piston rod 14 and the arm 30/
30a does not engage directly with the rotating head 16a, but engages with the lever arm 45.

In the embodiment shown in FIG. 7, the torque applied by piston 12 to rotating head 16a is relatively small.

The reason is that the piston rod 14 is connected to the cylinder housing 1.
This is because when the free end of the lever arm 45 is pushed out from the arm 30a, the arm 30a simultaneously pulls the lever arm 45. However, in cases where there is an obstacle near the male screw to be turned and the male screw must be rotated on the head of the male screw, and a lever arm as thin and long as possible is required, a joint 15 is used. It is suitable to use a lever arm 45 which lies approximately on a common radius of the rotating rad 16. On the other hand, depending on the length of the lever arm 45, the torque applied to the head of the male screw can be changed.

[Brief explanation of the drawing]

1 is a schematic diagram of the rotary tool; FIG. 2 is a view taken in the direction of arrow II in FIG. 1; and FIG. 3 is a view similar to FIG. 2 with support arms attached to the cylinder housing instead of rollers. , Figures 4 and 5 are schematic diagrams showing an alternative method of attaching the arm to the cylinder housing; Figure 6 is a schematic diagram of the hydraulic cylinder of Figure 1 using an alternate arm and an alternate rotating head; In the parts diagram of the rotary tool shown in Fig. 6, another lever arm is attached to the cylinder housing in order to maintain a free area with the smallest possible circumferential extension in the vicinity of the workpiece to be rotated. be. 10... Hydraulic cylinder, 11-... Cylinder housing, 12... Piston, 13... Lug, 14...
・Piston rod, 15--first joint, 16--rotating head, 17--another joint, processing arm, a-
...Second joint, 37...Support arm, 39...Support roller.

Claims (1)

Claims: (1) a rotary head that can be placed above the workpiece; a hydraulic cylinder into which is inserted a piston that is connected to a first point of articulation of the rotary head via an articulated fixture; fixed to the cylinder housing of this hydraulic cylinder,
and an arm coupled to a second articulation point of the rotating head via a second joint; and a support mechanism for supporting the cylinder housing relative to a stationary bearing surface, the articulated fixture comprising: A rotary tool configured to follow oscillation of a first articulation point relative to an axis of the cylinder. (2. The rotary tool according to claim 1, wherein the articulated fixture is connected to the first joint point via the first joint, and is connected to the first joint point via the second joint. A rotary tool having a piston rod connected to a piston. (3) The rotary tool according to claim 1, wherein the arm is removably attached to the cylinder housing. and at least one other arm is provided, the arm being different from the configuration of the second coupling in relation to the cylinder housing, the arm being smaller in size and the at least one other arm being in relation to the cylinder housing. (4) The rotary tool according to claim 1, wherein the arm is attached to the cylinder housing at various positions in the longitudinal direction of the housing. (5) Rotary tools according to claim 1, which differ from each other with respect to various configurations of the articulation points of the first and second joints. (6) A rotary tool according to claim 1, which also has a lever arm, and the lever arm has a rotary head that is rotated from the axis of the rotary head. (7) A rotary tool according to claim 1, wherein the arm is detachable. (8) The rotary tool according to claim 1, wherein one shaft has a pivotable support leg. (9) The rotary tool according to claim 1, wherein one shaft has a support roller that can rotate.