JPH03196977A - Power wrench - Google Patents

Abstract

PURPOSE: To efficiently adjust a threaded connector by providing a removable reaction member which can be easily removed and replaced with a reaction member having a longer reaction shaft or a shorter reaction shaft, and locating the reaction member adjacently in the same plane as the threaded connector to be tightened or loosened. CONSTITUTION: When a drive device 5 is operated and a piston rod is moved in one direction, a drive plate 1 is rotatively driven in one direction to rotate a ratchet 6, and a ratchet wheel 7 is rotated. The ratchet wheel 7 rotates a drive shaft 13, and the drive shaft 13 transmits its rotation to a socket. The socket fixed to a threaded connector such as a nut and a bolt head rotates the threaded connector in the prescribed direction. During the stroke in the opposite direction of the drive device 5, the teeth of the ratchet 6 prevent the ratchet wheel 7 from rotating in the opposite direction. The connector is tightened or loosened by the sequential rotation in one direction of the connector.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power wrench used for tightening or loosening a threaded connector.

More particularly, the present invention relates to a power wrench that operates using a socket mounted on a drive shaft to tighten or loosen a threaded connector that is out of the plane of the tool.

[Conventional technology]

In the wand position described above, while tightening or loosening a threaded connector, the tool is positioned above the threaded connector to be rotated (nut, bolt head, etc.) and the reaction arm of the tool is pushed against the adjacent object. It is touching downward. During such operations, extremely large torsional forces are created because the tool and the threaded connector are in different planes and the reaction forces generated during the operation tend to twist the tool. The applicant's US Pat. No. 4,706.527 provided a solution to this problem. In this reference, a splined sleeve extends around the axis of a square-section drive shaft, and the drive shaft is rotated within the sleeve. The spline sleeve is part of the side plate of the housing to which the reaction member is attached so that bending and torsional forces are eliminated.

[Problem to be solved by the invention]

However, the tool disclosed in this reference has some limitations. It cannot be efficiently adjusted to tighten or loosen threaded connectors that are located a significant distance from the plane of the tool. If the tool employs a non-reversible ratchet mechanism, the same tool cannot be used to tighten and loosen the threaded connector.

SUMMARY OF THE INVENTION It is therefore an object of the invention to provide a power wrench of the general type described above which eliminates the disadvantages of the prior art.

[Means to solve the problem]

In accordance with these objects and others that will become apparent from the following description, one feature of the invention is, briefly stated, that:
a housing having at least two parts; at least one pawl having an axis; a ratchet mechanism including a ratchet wheel; a power drive disposed inside one part of the housing; and a power drive coupled to the power drive. and a drive element actuated by a power drive, the drive element being coupled to the ratchet wheel to rotate the pawl and the ratchet wheel about an axis, the drive element being coupled to the ratchet wheel in a predetermined plane. further comprising a support element for supporting the drive element;
the support element being formed by the other part of the housing and extending substantially in one direction of the plane and further comprising a drive shaft arranged to carry means for rotating the threaded connector; a drive shaft extending axially substantially transversely to the plane on one side of the plane, the drive shaft being removably coupled to a ratchet mechanism to facilitate removal of the drive shaft; , to be able to reach threaded connectors located farther or closer to the plane by replacing longer or shorter drive shafts, and furthermore, the axis on the side of the plane on the same side as the drive shaft. a reaction member including a reaction axis extending substantially transversely to the plane in the direction of the reaction member; and a reaction member disposed on the reaction axis and extending substantially transversely to the axis; removable, capable of being easily removed and replaced with a reaction member having a longer or shorter reaction axis, adjacent in the same plane to the threaded connector to be tightened or loosened; located further away from the plane of the driving element,
Or, even more so, in a power wrench that can be applied to stationary objects located nearby.

When the actuator mechanism and power wrench are designed according to the present invention, the drive shaft is removably coupled to the ratchet wheel and the screw threads at different distances apart can be replaced by drive shafts of different lengths. If you use a non-reversible ratchet ring that can reach the connector or is provided on the opposite side of the tool face, it will reverse the action from tightening to loosening and vice versa. It can be done.

According to another advantageous feature of the invention, the sleeve surrounding the drive shaft is also removable and can be replaced by sleeves of different lengths or can be mounted on opposite sides of the tool plane and each Can be adapted to the dimensions or installed drive shaft.

According to a further feature of the invention, the guide sleeve has on the one hand the function of guiding the drive shaft and on the other hand a reaction force for reacting against an adjacent object during the tightening or loosening of the threaded connector. It can be part of an element that acts as a member.

The novel features which are considered characteristic of the invention are set out in the claims.

〔Example〕

Preferred embodiments of the present invention will be described with reference to the drawings.

The power wrench for tightening or loosening threaded connectors has a housing 10 with two housing parts 10' and 10'' (see FIG. 2). As is clear from FIG. The power drive 5 has a part 2. The power drive 5 can be formed as a cylinder-piston unit with a piston arranged in a housing part 10' and connected to a piston rod 4. Reciprocating movement of the cylinder-piston unit During this, the drive plates l are rotated in respective opposite directions.

The actuator mechanism of the present invention further includes a ratchet mechanism having a pawl 6 attached to the drive plate 1 and a ratchet 7 engaging the pawl 6. During rotation of the drive plate 1 in one direction, the pawls 6 are rotated in the same direction, and the engagement of the pawls 6 and the ratchets 7 causes the ratchet wheels to rotate in the same direction. During rotation of the drive plate in the opposite direction, the teeth of the pawl 6 slide on the ratchet wheel without rotating it. Such a ratchet mechanism is a non-reversing ratchet mechanism.

It should be understood that in the actuating assembly according to the invention, reversible ratchet mechanisms known in the art of abutting with a bidirectional working stroke can also be used.

The support element supports the drive link and is formed by the housing part 10''.

The support elements include, for example, two side plates 8 provided on either side of the drive plate 1. These sides Fi, 8 are connected to each other by a pin 9 and to the tool housing IO by a pin 11.

The side plate 8 has a central opening for supporting the respective parts of the tool, as explained below.

A drive shaft 13 is provided for rotating the threaded connector to be tightened or loosened. This drive shaft 13 has
In order to rotate the threaded connector in the respective directions, a socket to be fitted onto the threaded connector may be attached. The ratchet wheel 7 has a central opening 14 into which a portion of the drive shaft 13 is inserted. The ratchet wheel 7 and the drive shaft 13 are coupled to each other for joint rotation, for example by cooperating splines or other polygonal shapes.

As can be seen, the drive shaft 13 has an axis A and extends substantially in the direction of the axis on one side of the plane B of the drive plate 1 . On the opposite side of the plane B, a small part projects axially beyond the ratchet wheel 7.

The part of the drive shaft 13 that extends to the right of plane B is guided in a guide element I5, which in this embodiment is designed as a guide sleeve. The guide sleeve I5 extends into the central hole of the right-hand side Fi8 and is removably connected to the right-hand side plate 8, for example by splines or other preferably polygonized sections. The opposite small part of the drive shaft 13 located on the left side of the plane B is guided by a holding means, which has a holding element 16 and a holding member 17 . The retaining element 16 is cup-shaped, the axial wall of which extends through the central hole of the left-hand side plate 8 and is provided with a spline or other preferably polygonal structure in the left-hand side plate 8. The parts are removably connected. The retaining member 17 is also cup-shaped and its axial side wall is removably connected to the small left-hand portion of the drive shaft 13, for example by splines or other preferably polygonalized sections. Retaining member 17 is slidably housed within retaining element 16 . A screw 18 passes through the central hole of the holding element 16 and the holding member 17 and is screwed into a threaded hole 19 at the left end of the drive shaft 13 and is held by a spring clip 20 on the drive shaft 13. The guide sleeve I5 is further held by a spring clip 21.

A reaction member 22 is provided on the tool. This reaction member 22 is arranged on the guide sleeve 15 and is connected thereto by splines or other preferably polygonized sections.

As can be seen, the same splines on the guide sleeve 15 are used to connect the guide sleeve 15 to the right side plate 8 and the reaction member 22. Reaction member 2
2 includes a reaction axis 22', which extends substantially in the direction of axis A and across plane B. The reaction shaft 22' is provided at its distal end with a reaction portion 22'' configured to reach an adjacent object during tightening or loosening of the threaded connector. It extends vertically.

The operation of the actuator mechanism of the power wrench according to the invention will be apparent from the structure described above.

When the drive device 5 is activated and the piston rod 4 moves in one direction, the drive plate I is rotationally driven in one direction to rotate the pawl 6, which in turn causes the ratchet wheel 7 to rotate. The ratchet wheel 7 rotates the drive shaft 13, and the drive shaft 13 transmits the rotation to the socket. A socket fixed onto a threaded connector, such as a nut, bolt head, etc., then causes the threaded connector to rotate in a predetermined direction. During the reverse stroke of the drive 5, the teeth of the pawl 6 slide over the teeth of the ratchet wheel 7 and do not cause the ratchet wheel 7 to rotate in the opposite direction. Sequential rotation of the threaded connector in one direction tightens or loosens the connector.

According to the present invention, the drive shaft 13 and the guide sleeve 15 can be easily removed by loosening the screw 18 and moving the drive shaft 13 and the guide sleeve 15 to the right in FIG. During removal, a new drive shaft 13 axially longer or shorter can be connected to the ratchet wheel, and a guide sleeve 15 corresponding to the axially longer or shorter length can be connected to the right side plate. 8, thereby allowing rotation of threaded connectors located further from plane B or closer to plane B. Reaction member 2
2 can also be removed and replaced with a longer or shorter reaction member to reach the corresponding adjacent target.

Further, even if the ratchet mechanism is a non-reversible mechanism, the operation of the tool can be switched from a tightening operation to a loosening operation, or vice versa. In this case, the drive shaft 13 together with the guide sleeve 15 is removed from the right side of the tool, the holding means 16 and 17 are removed from the left side of the tool,
The drive shaft 13 together with the guide sleeve 15 is then mounted on the left side of the tool and the holding means 16, 17 on the right side of the tool. For this purpose, the holding means 16.1
7, the splines on the guide sleeve 15 and on the side plates 8 are formed identically so that in either of the above-mentioned positions, the retaining means is mounted on one side and the drive shaft together with the guide sleeve is mounted on the other side. Try to get it. The reaction member is also removed from the right side and screwed onto the left side of plane B.

FIG. 3 shows another embodiment of the invention. In this embodiment, the tool is provided with an element 23.

This element 23 has a guide portion 24 which substantially corresponds to the guide sleeve 15 of the embodiment of FIG. It also has a reaction portion 25 which substantially corresponds to reaction member 22 of the embodiment of FIG. Since these parts 24 and 25 are of unitary construction, element 23 is an integral element of the picture part. The operation of the tool shown in FIG. 3 substantially corresponds to the operation of the tool shown in FIG. In the embodiment of FIG. 3, during installation of the drive shaft 13 on the opposite side (left side) of the plane B, the guide part
4, but also the reaction part 25 is mounted on the opposite side of the plane B.

It will be appreciated that each of the elements described above, or alternatively two or more together, may also be applied to other types of structures different from those described above.

Although embodiments of the power wrench of the present invention have been illustrated and described,
The invention is not limited to the details shown, and various modifications and structural changes may be made without departing from the spirit of the invention.

Without further analysis, what has been stated above has been stated without omitting features which, by the application of current knowledge and from the point of view of the prior art, constitute essential features of the invention as a whole or of particular aspects. The gist of the invention is fully clarified so that it can be easily adapted to seed applications.

〔Effect of the invention〕

The present invention is as described above, and has the advantage that threaded connectors located far away from or close to the plane of the tool can be easily tightened and loosened using the same tool.

[Brief explanation of drawings]

FIG. 1 is a side view showing the actuator mechanism of a power wrench according to the present invention, FIG. 2 is an end view of the actuator mechanism of FIG. 1 connected to the drive device of the power wrench, and FIG. It is a figure which shows another modification. Description of symbols I--driving element, 2--driving plate 3--cup-shaped protrusion, 4--piston rod 5--power drive device, 6--claw 7--ratchet wheel, 8-- side plate 9-・Pin, i
o-outer casing 11--bin;
I2...Center hole 13-...Drive shaft, 1
5--Guide sleeve 16--Retaining element, 17
...-Holding member 18--Screw,
19-Threaded hole 20.21- Spring clip

Claims (1)

[Claims] 1. A power wrench for tightening and loosening a threaded connector, comprising: a housing having at least two parts; a ratchet mechanism having an axis and including at least one pawl and a ratchet wheel; and the housing. a power drive disposed inside one of said two parts of said power drive, and a drive element coupled to said power drive and actuated by said power drive; the drive element is coupled to the ratchet mechanism to rotate the pawl and the ratchet, the drive element extending in a predetermined plane, and further comprising a support element supporting the drive element, the support element a drive shaft formed by the other of the portions of the housing and extending substantially in one direction of the plane and further arranged to carry means for rotating the threaded connector; The drive shaft extends on one side of the plane in the direction of the axis and substantially transverse to the plane, and the drive shaft is removably coupled to the ratchet mechanism to facilitate the drive shaft. configured to be able to be removed and replaced with a longer or shorter drive shaft to reach a threaded connector located further or closer to the plane, furthermore, on the same side of the plane as the drive shaft; a reaction member comprising a reaction shaft extending substantially transversely to said plane in the direction of an axis; and a reaction portion disposed on said reaction shaft and extending substantially transversely to said axis. and wherein the reaction member is removable and can be easily removed and replaced with a reaction member having a longer or shorter reaction shaft to be tightened or loosened. A power wrench, characterized in that it is configured to be able to reach a stationary object located adjacent to and in the same plane as the drive element, but located further or closer to the plane of the drive element. 2. The drive shaft and the reaction member are easily removable and connectable to the ratchet mechanism on the other side of the plane of the drive element, changing the operation of the power wrench from a tightening operation to a loosening operation; The power wrench according to claim 1, wherein the power wrench is capable of converting from a loosening operation to a tightening operation. 3. further comprising indoor means for guiding the drive shaft, the guide means including a guide element extending over at least a portion of the drive shaft, the guide element being removable and easily removable; It is possible to replace the guide elements with longer or shorter guide elements, which can be adapted to each of said drive shafts, and which can be easily removed and placed on the other side of said plane. 2. A power wrench as claimed in claim 1, adapted to fit onto a drive shaft. 4. Power wrench according to claim 3, wherein the guide element is formed as a sleeve, which sleeve surrounds a part of the drive shaft and is connected to the support element. 5. The guide element has a part surrounding a part of the drive shaft, and another part connected to the support element and extending from the first-mentioned part tightens the threaded connector as a reaction member. The power wrench according to claim 3, wherein the power wrench is formed so as to be able to abut against an adjacent object while relaxing. 6. further comprising retaining means disposed on a side of said plane opposite said guide element, said retaining means comprising a retaining element, said retaining element being removably connected to said support element; 4. A power wrench as claimed in claim 3, in which the retaining means are removable so that the guide element can be mounted on opposite sides of the plane and the retaining means can be mounted on one side of the plane. 7. The retaining means also includes a retaining member surrounding the other part of the drive shaft, and is connected to the other part of the drive shaft, the retaining member being freely rotatably disposed within the retaining element. The power wrench according to claim 6. 8. said ratchet wheel having a central aperture, said drive shaft extending through said central aperture, and further comprising means for coupling said drive shaft to said ratchet wheel, said coupling means connecting said drive shaft to said ratchet wheel; The power wrench according to claim 1, further comprising polygonal shaped portions provided on the ratchet wheel and capable of engaging with each other. 9. Further comprising means for holding the guide element relative to the drive shaft, the holding means comprising a holding element provided on one of the guide element and the drive shaft.
Power wrench as described.