CN106216534B

CN106216534B - Hydraulic tool

Info

Publication number: CN106216534B
Application number: CN201610578901.8A
Authority: CN
Inventors: 哈拉尔德·克龙多费尔; 周启; 吴阔
Original assignee: Emerson Professional Tools Shanghai Co Ltd
Current assignee: Emerson Professional Tools Shanghai Co Ltd
Priority date: 2016-01-19
Filing date: 2016-07-21
Publication date: 2020-04-28
Anticipated expiration: 2036-07-21
Also published as: CN106216534A; CN205996044U

Abstract

The invention relates to a hydraulic tool comprising a working unit, a drive unit and a connecting unit. The work unit is adapted to operate on a workpiece. The driving unit is configured to drive the working unit. The connecting unit connects the working unit and the driving unit. The connecting unit is provided with a first mounting portion and a second mounting portion, and the working unit can be selectively mounted on the first mounting portion and the second mounting portion of the connecting unit.

Description

Hydraulic tool

Technical Field

The present invention relates to a hydraulic tool, and in particular to a hydraulic tool for a workpiece such as a pipe.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

In general, a hydraulic tool (also referred to as a crimping tool in some cases) for crimping a workpiece such as a pipe includes a working unit (also referred to as a crimping unit in some cases), a driving unit for driving the working unit to process the workpiece, and a connecting unit connecting the working unit to the driving unit. The drive unit is often a hydraulic drive unit comprising a hydraulic cylinder, a piston and a piston rod accommodated in the hydraulic cylinder, the piston and the piston rod being herein collectively referred to as the movable part. After the hydraulic tool is assembled, the movable portion of the drive unit often has a single stroke.

Accordingly, there is a need in the art for a hydraulic tool that is capable of varying stroke and/or varying the working unit.

Disclosure of Invention

It is an object of the present invention to provide a hydraulic tool capable of stroke modification and/or work cell modification, which may be adapted to a variety of applications or workpieces.

It is a further object of the present invention to provide a hydraulic tool that is less costly.

One or more of the above objects can be achieved by the following solutions: a hydraulic tool includes a working unit, a driving unit, and a connecting unit. The work unit is adapted to operate on a workpiece. The driving unit is configured to drive the working unit. The connecting unit connects the working unit and the driving unit. The connecting unit is provided with a first mounting portion and a second mounting portion, and the working unit can be selectively mounted on the first mounting portion and the second mounting portion of the connecting unit.

With the above arrangement, since the working unit can be selectively mounted on the first mounting portion and the second mounting portion of the connecting unit, the stroke of the movable portion of the driving unit can be changed, and further, better adaptability to different specifications of tool units can be achieved. Therefore, the hydraulic tool according to the present invention has a wider range of applications. Preferably, the connection unit comprises a base portion, a first leg and a second leg extending in parallel from the base portion. The work unit is mounted between the first leg and the second leg. The base portion is connected to or part of the drive unit.

Preferably, the first and second mounting portions are disposed on a stroke path of the driving unit and spaced apart by a predetermined distance.

Preferably, the first mounting portion comprises a pair of first apertures provided in the first and second legs respectively for receiving a pin, and/or the second mounting portion comprises a pair of second apertures provided in the first and second legs respectively for receiving the pin.

Preferably, the hydraulic tool further comprises a pin locking means for selectively locking the pin in the pair of first holes and the pair of second holes.

Preferably, the pin is provided with a recess or step, and the pin locking means comprises a latch which engages with the recess or step to lock the pin.

Preferably, the pin locking device further comprises a resilient member biasing the latch towards the pin.

Preferably, the hydraulic tool further comprises a pin unlocking means for disengaging the pin locking means from the pin.

Preferably, the pin unlocking means comprises a button, and one of the button and the latch comprises an inclined surface at an angle to a pressing direction of the button. The other of the button and the latch rests on the inclined surface such that the button, when depressed, forces the latch to move away from the pin.

Preferably, the other of the button and the latch is configured to be in point contact or line contact with the inclined surface.

Optionally, a groove for accommodating the pin locking device is provided in the first leg and/or the second leg.

Preferably, the pin locking means comprises first locking means for the first mounting portion and second locking means for the second mounting portion.

Further, the pin unlocking means includes first unlocking means for unlocking the first locking means and second unlocking means for unlocking the second locking means; or the pin unlocking means is configured to be able to unlock the first locking means and the second locking means simultaneously.

Preferably, an elongated groove is provided in the pin unlocking means, and a mounting member for mounting the pin unlocking means to the connection unit is received in the elongated groove to allow the pin unlocking means to be movable in a pressing direction when pressed down.

Preferably, the hydraulic tool further comprises a drop prevention device connected to the connection unit for preventing the pin from dropping.

Preferably, the drop prevention device includes a pin holder and a drop prevention member. The pin holder includes a bore that receives the pin. The anti-drop member is provided in the pin holder. The pin is provided with a sliding groove extending in an insertion direction thereof, and the anti-drop member is capable of moving along the sliding groove but preventing the pin from dropping.

Preferably, the drop prevention device further comprises a first biasing member for biasing the drop prevention member toward the pin.

Preferably, the anti-drop member is in the form of a pin.

Preferably, the drop prevention device further comprises a mounting member for mounting the first biasing member, the mounting member being fixedly connected to the pin holder.

Preferably, the pin is provided with a sliding groove extending in the insertion direction thereof, along which the drop prevention member can move.

Preferably, the slide groove is provided at an end thereof adjacent to the head portion of the pin with a depressed portion recessed with respect to the slide groove, and the drop preventing member locks the pin in the connection unit when located in the depressed portion.

Preferably, the countersink has a locked position and an unlocked position. A drop prevention member locks the pin in the connection unit when located at the locking position in the countersink, and the drop prevention member allows the pin to be disengaged from the connection unit when located at the unlocking position in the countersink.

Preferably, a drive surface is further provided between the unlocking position of the countersink and the chute, the drive surface being configured to enable the drop guard to move from the unlocking position in the countersink into the chute via the unlocking position when the pin is pressed.

Preferably, the drive faces are curved or inclined.

Preferably, a flange portion extends from the pin holder, the flange portion having a hole therein for receiving a pivot shaft, the pivot shaft being mounted on the link unit such that the pin holder can pivot about the pivot shaft between the first and second mounting portions.

Preferably, the hydraulic tool further comprises a slide slidably mounted on one of the first and second legs, the slide having a through hole provided therein for receiving the pin and the pin holder.

Preferably, the hydraulic tool further comprises a slide locking device for locking the slide.

Preferably, a notch is provided on said one of said first leg and said second leg, said slider locking means comprising a locking pin engaging with said notch to lock said slider.

Preferably, the slider locking device further comprises a second biasing member biasing the lock pin toward the one of the first leg and the second leg.

Preferably, the hydraulic tool further comprises a slide unlocking means for disengaging the lock pin from the notch.

Preferably, the slider unlocking means includes a button, and one of the button and the lock pin includes an inclined surface at an angle to a pressing direction of the button. The other of the button and the detent abuts against the inclined surface such that the button, when depressed, forces the detent to move away from the recess.

Preferably, the button is provided with a third biasing member for biasing the button away from the latch. Optionally, the pin holder is integrally formed with the slider.

Preferably, a pin biasing member for applying a biasing force to the pin in a direction away from the connection unit is provided on the pin.

Preferably, the first and second mounting portions are configured to be suitable for selective mounting of working units having different specifications.

Optionally, the stroke of the movable part of the drive unit is between 90mm and 110mm, preferably 100mm, when the working unit is mounted to the first mounting portion of the connection unit.

Optionally, the stroke of the movable part of the drive unit is between 35mm and 50mm, preferably 41mm, when the working unit is mounted to the second mounting portion of the connection unit.

Optionally, the connection unit further comprises an additional mounting portion closer to the drive unit or closer to the working unit than the first mounting portion and the second mounting portion.

The hydraulic tool according to the invention may be a crimping tool or a shearing tool, in particular a crimping tool or a shearing tool for tubular workpieces.

Drawings

The features and advantages of one or more embodiments of the present invention will become more readily understood from the following description taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic front view of a hydraulic tool according to an embodiment of the present invention, in which a working unit of the hydraulic tool is connected to a first mounting portion of a connecting unit;

FIG. 2 is a partial cross-sectional view of the hydraulic tool of FIG. 1;

FIG. 3 is a partial cross-sectional view of a hydraulic tool with a working unit of the hydraulic tool coupled to a second mounting portion of a linkage unit in accordance with an embodiment of the present invention;

FIG. 4 is a partial perspective view of a connection unit of a hydraulic tool according to an embodiment of the present invention;

FIG. 5 is a schematic view, partly in section, of a hydraulic tool showing a pin, latch and button coupling a working unit to a connection unit according to an embodiment of the invention;

FIG. 6 is a schematic view of a pin in a locked state according to an embodiment of the present invention;

FIG. 7 is a schematic view of a pin in an unlocked state according to an embodiment of the present invention;

FIG. 8 is a schematic view of a pin in a locked state according to another embodiment of the present invention;

FIG. 9 is a schematic view of the hydraulic tool of FIG. 1, schematically illustrating the stroke of the movable portion of the drive unit;

FIG. 10 is a schematic view of the hydraulic tool of FIG. 3, schematically illustrating the stroke of the movable portion of the drive unit;

FIG. 11 is a schematic view of a portion of a hydraulic tool showing a pin in a first mounting portion and in an unlocked condition in accordance with an embodiment of the present invention;

FIG. 12 is a schematic view of the pin of FIG. 11 in a locked condition;

FIG. 13 is a schematic view of a portion of a hydraulic tool showing a pin in a second mount and in an unlocked condition in accordance with an embodiment of the present invention;

FIG. 14 is a schematic view of the pin of FIG. 13 in a locked condition;

FIG. 15 is a schematic plan view of a pin according to an embodiment of the invention;

FIG. 16 is a cross-sectional view taken along line B of FIG. 15;

FIG. 17 shows the pin in a locked condition;

FIG. 18 shows the pin in the unlocked state;

FIG. 19 is a schematic perspective view of another embodiment of the present invention, with certain components not shown for clarity;

FIG. 20 is a top view of FIG. 19;

FIG. 21 is a cross-sectional view taken along line B-B of FIG. 20 with the slider in a locked condition; and

FIG. 22 is another cross-sectional view taken along line B-B of FIG. 20 with the slider in an unlocked state.

Detailed Description

The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. The same reference numerals are used to designate the same components in the respective drawings, and thus the configurations of the same components will not be described repeatedly.

A hydraulic tool according to an embodiment of the present invention will be described with reference to fig. 1 to 10. It should be understood that the principles of the present invention are illustrated herein for illustrative purposes by way of example of a crimping tool operating on a tube. However, the present invention is not limited to the crimping tool, and for example, the present invention can also be applied to a clamping tool, a shearing tool, a pressing tool, and the like.

Referring to FIG. 1, a crimping tool for crimping tubing according to an embodiment of the invention is shown. As shown in fig. 1, a crimping tool according to an embodiment of the present invention may be in the form of a hand-held power tool. The crimping tool may include a crimping unit (or referred to as a working unit) 30, a driving unit 20, and a connecting unit 10 between the crimping unit 30 and the driving unit 20. The crimping unit 30 may be configured to crimp a workpiece such as a pipe. The driving unit 20 may be configured to drive the crimping unit 30.

In the illustrated example, the crimping unit 30 includes two crimping

members

31 and 33. The two crimping

members

31 and 33 may be in the form of plates, arranged side by side and adjacent in one plane. Preferably, the crimping

members

31 and 33 may have substantially the same structure and be arranged substantially symmetrically about an axis therebetween, wherein the axis is substantially perpendicular to the longitudinal axis of the workpiece (e.g., tube) to be crimped and may be referred to as an axis of symmetry. Here, for convenience of description, sides (faces) of the crimping

members

31 and 33 adjacent to each other are referred to as inner sides (faces), and sides (faces) thereof distant from each other are referred to as outer sides (faces); the ends (portions) of the crimping

members

31 and 33 adjacent to the drive unit are referred to as inner ends (portions), and the ends (portions) distant from the drive unit are referred to as outer ends (portions).

The

crimp members

31 and 33 each include a crimp portion and a driving portion for driving the crimp portion. The crimping portions of the crimping

members

31 and 33 are close to the outer end portions and include crimping

surfaces

311 and 331 on the inner side surfaces, and the workpiece is accommodated in a space formed by the crimping

surfaces

311 and 331 of the crimping

members

31 and 33. The driving portions of the crimping

members

31 and 33 are close to the driving unit and include cam surfaces (or called driven surfaces) 312 and 332 on the inner side surfaces.

The crimping

members

31 and 33 may be installed between the two side plates 35 by a pin connection. As shown, the crimping member 33 is connected between the two side plates 35 by the pin 34, and the crimping member 31 is connected between the two side plates 35 by the pin 32. Thus, when the cam surfaces 312 and 332 are driven by the drive unit, the crimping member 31 pivots about the pin 32, and the crimping member 33 pivots about the pin 34. That is, as the cam surfaces 312 and 332 pivot away from each other, the crimp surfaces 311 and 331 pivot toward each other and vice versa.

In the illustrated example, the side plates 35 are generally T-shaped, including lateral portions and leg portions. Holes for receiving the

pins

32 and 34 are provided at both ends of the transverse portion, respectively, while holes for receiving the pins 120 are provided near the free ends of the legs, wherein the pins 120 are used for connecting the crimping unit 30 to the connection unit 10 and further to the drive unit 20. In one example, a biasing member, such as a spring 127 (shown in fig. 11 to 14), may be provided on the pin 120 for applying a biasing force to the pin 120 in a direction away from the connection unit 10.

The drive unit 20 may be a hydraulic drive unit. In one example, the drive unit 20 may include a cylinder 21 having an internal cavity and a movable part (piston 23 and piston rod 25) accommodated in the cavity of the cylinder and movable under hydraulic pressure. The cylinder 21 may in some examples be a housing of a drive unit. The cylinder 21 may also be referred to as a stationary part of the drive unit 20. In the case of a hydraulic drive unit, the movable part may comprise a piston 23 and a piston rod 25 connected to the piston 23 and moving with the piston 23.

When the hydraulic cylinder is filled with the high-pressure fluid, the piston 23 and the piston rod 25 are moved toward the crimping unit 30 by the urging of the high-pressure fluid. When the crimping tool is not operated, the piston 23 and the piston rod 25 are in the initial position. During crimping by the crimping tool, the position corresponding to the maximum stroke of the piston 23 and the piston rod 25 is referred to as the working position. That is, the piston 23 and the piston rod 25 are movable between the initial position and the working position. While the piston 23 and the piston rod 25 are moved, the piston 23 and the piston rod 25 push the driving portions (i.e., the cam surfaces 312 and 332) of the crimping

members

31 and 33 to pivot about the

pins

32 and 34, respectively, thereby crimping the workpiece accommodated in the space defined by the crimping

surfaces

311 and 331 of the crimping

members

31 and 33. In one example, a spring 27 may also be provided on the piston rod 25, the spring 27 applying a spring force to the piston 25 against the hydraulic force of the high-pressure fluid to force the piston 25 to return to the initial position after the pressure relief.

In one example, rollers 22 for pushing the crimping

members

31 and 33, respectively, may be provided at the free end of the piston rod 25. The roller 22 may be mounted to the piston rod 25 in the following manner: when the piston rod 25 translates, the roller 22 may roll about its own central axis, but does not translate relative to the piston rod 25. The roller 22 acts on the cam faces 312 and 332 of the crimping

members

31 and 33 in a rolling manner, and friction between the roller 22 and the cam faces 312 and 332 can be greatly reduced, thereby reducing energy loss and reducing wear of the roller 22 and the cam faces 312 and 332.

A connection unit may be provided between the driving unit and the crimping unit. The connection unit may be a separate member, or may be a part of the driving unit or the working unit. Referring to fig. 4, there is a partial perspective view of a connection unit of a hydraulic tool according to an embodiment of the present invention. As shown, the connection unit 10 is part of the drive unit 20. The connection unit 10 includes a base body portion 110, a first leg 130 extending from the base body portion 110, and a second leg 150 extending from the base body portion 110 in parallel with the first leg 130. The crimping unit 30 is interposed between the first leg 130 and the second leg 150.

A through hole or aperture 131 may be provided in the first leg 130 and a through hole or aperture 151 may be provided in the second leg 150. In the illustrated example, the crimping unit 30 is detachably connected to the connection unit 10 by inserting the pin 120 into the through-hole 131 in the first leg 130, the through-hole 151 in the second leg 150, and the hole in the leg portion of the side plate 35.

Additionally, as shown, a through hole or aperture 133 may be provided in the first leg 130 and a through hole or aperture 153 may be provided in the second leg 150. Likewise, the crimping unit 30 can also be detachably connected to the connecting unit 10 by inserting the pins 120 into the through-holes 133 in the first leg 130, the through-holes 153 in the second leg 150, and the holes in the leg portions of the side plates 35.

The through hole 131 in the first leg 130 and the through hole 151 in the second leg 150 constitute a first mounting portion of the connection unit 10 connected to the crimping unit 30. The through hole 133 in the first leg 130 and the through hole 153 in the second leg 150 constitute a second mounting portion of the connection unit 10 connected to the crimping unit 30. In this way, the crimping unit 30 can be selectively connected to the first mounting portion or the second mounting portion of the connection unit 10.

The second mounting portion may be closer to the driving unit 20 than the first mounting portion. When the crimping unit 30 is connected to the first mounting portion of the connecting unit 10, the crimping unit 30 is distant from the driving unit 20, particularly from the driving unit 20, and the stroke of the movable portion (the piston 23 and the piston rod 25) of the driving unit 20 is long. For example, the long stroke may be between 90mm and 110mm, preferably 100 mm. When the crimp unit 30 is connected to the second mounting portion of the connection unit 10, the crimp unit 30 is closer to the drive unit 20, and the stroke of the movable portion of the drive unit 20 is shorter. The short stroke may be between 35mm and 50mm, preferably 41 mm.

For the hydraulic tool having the above-described connection unit, the crimping unit 30 may be selectively connected to the first and second mounting portions of the connection unit 10 according to a specific application. In addition, it is also possible to connect the crimping units 30 having different specifications to the first and second mounting portions of the connection unit 10, respectively. For example, a crimping unit having a long crimping member or a large crimping unit may be coupled to the first mounting portion of the connection unit 10; a crimp unit having a short crimp member or a small crimp unit may be coupled to the second mounting portion of the connection unit 10. The hydraulic tool according to the invention makes it possible to vary the stroke of the movable part of the drive unit and also to have a better adaptability to different sizes of tool units. Therefore, the hydraulic tool according to the present invention has a wider range of applications.

In one example, the crimping tool 1 may further include a pin locking device that locks the pin 120 in the connection unit 10. Referring to fig. 5 to 8, the pin locking means includes a latch 142, and the pin 120 is provided with a recess 122 or a step 123 which is engaged with the latch 142. In the example of fig. 5-7, the recess 122 may be in the form of a groove extending over the entire circumferential extent of the pin 120. It will be appreciated that the recess 122 may also be a partially concave form of the outer peripheral surface of the pin 120. In the example of fig. 8, one end of the pin has a step 123, and the latch 142 engages with the step 123 to prevent the pin 120 from being disengaged from a hole provided in the connection unit 10.

The pin locking means may further include a resilient member (or biasing member) that biases the latch 142 toward the pin 120. The resilient member may be in the form of a compression spring 143. A spring 143 may be provided at an end of the latch 142 opposite the pin 120. The above-described recess 122 or step portion 123 is provided at a position of the pin 120 corresponding to either or both of the first leg 130 and the second leg 150. The first leg 130 and/or the second leg 150 may have a recess disposed therein for receiving the latch 142. However, it should be understood that the latch 142 may also be movably (e.g., slidably) mounted on an outer surface of the connection unit.

The crimping tool 1 may also include a pin unlocking means that disengages the pin locking means from the pin. As shown in fig. 5 to 8, the pin unlocking means includes a button 160. The latch 142 is provided with an inclined surface 141, and one end of the push button 160 abuts against the inclined surface 141. The inclined surface 141 is angled with respect to the pressing direction of the button 160. Thus, when the button 160 is pressed downward, a force component in the longitudinal direction of the latch 142 forces the latch 142 to move away from the pin 120. In the illustrated example, the latch 142 is arranged in a horizontal direction, while the button 160 is arranged in a vertical direction and is pressed in the vertical direction.

The end of the button 160 abutting the inclined surface 141 may be tapered or inclined to make point or line contact with the inclined surface 141 of the latch 142. In this way, friction between the button 160 and the latch 142 may be reduced.

An elongated slot 164 may be provided in the button 160. A mount 162 for mounting the button 160 to the connection unit 10 may be received in an elongated slot 164. The size of the elongated groove 164 in the pressing direction P is larger than its size in a direction perpendicular to the pressing direction P, thereby allowing the button 160 to be movable in the pressing direction P when pressed.

Separate first and second locking means may be provided for the first and second mounting portions respectively. In this case, separate first unlocking means and second unlocking means may be provided for the first locking means and the second locking means, respectively, or a single unlocking means may be provided for simultaneously unlocking the first locking means and the second locking means.

Referring to fig. 11 to 18, a drop prevention device for preventing the drop of the pin 120 will be described. The illustrated drop prevention device may include a pin holder 170 and a drop prevention member 176. A hole 175 is provided in the body of the pin holder 170 for receiving the pin 120. The drop preventing member 176 can prevent the pin 120 from being removed from the hole 175 of the pin holder 170 when the pin 120 is removed from the connection unit 10.

A slide groove 121 may be provided on an outer surface of the pin 120. The slide groove 121 extends in the insertion direction of the pin 120, i.e., in the illustrated example, in the lengthwise direction of the pin 120. The falling prevention member 176 may be accommodated in the slide groove 121 and move along the slide groove 121. As shown in fig. 11, 13 and 18, when the pin 120 is detached from the connection unit 10, the drop preventing member 176 moves to the lower end of the slide groove 121 (i.e., the end near the tail of the pin 120) and abuts against the lower end of the slide groove 121, thereby preventing the pin 120 from dropping.

In one example, a laterally extending through-hole is provided in the body portion of the pin holder 170, in which the drop guard 176 is received. A biasing member, such as a spring 177, for biasing the drop prevention member 176 toward the pin 120 may also be provided in the through hole. Optionally, a mounting member 178 may also be provided in the through bore to facilitate assembly of the biasing member. The mounting member 178 may be fixedly connected to the pin holder 170. In one example, the drop guard 176 may be in the form of a pin.

As shown in fig. 15, a sunk portion 125 recessed with respect to the slide groove 121 is provided at one end of the slide groove 121 near the head portion (right side in fig. 15) of the pin 120. The drop prevention member 176 locks the pin 120 in the connection unit 10 when located in the depressed portion 125 (as shown in fig. 17). The countersink 125 may be configured to: when the pin 120 is pressed and the pin 120 is rotated, the drop prevention piece 176 moves from the locking position L1 (shown by a solid line in fig. 15 and 16) to the unlocking position L2 (shown by a broken line in fig. 15 and 16) in the countersink 125. The falling preventive piece 176 locks the pin 120 in the link unit 10 when located at the locking position L1 in the depressed portion 125. The falling prevention piece 176 allows the pin 120 to be disengaged from the connection unit 10 when located at the unlock position L2 in the depressed portion 125.

A driving surface 126 may also be provided between the countersink 125 and the chute 121. The drive surface 126 is configured to be able to move the drop prevention member 176 from the unlocking position L1 in the countersink 125 into the chute 121. In this way, when the drop prevention member 176 is in the unlock position L2, the pin 120 may be temporarily unrestrained by the drop prevention member 176, thereby allowing the pin 120 to move in a direction to disengage the connection unit 10 by the spring 127. Then, the fall preventer 176 is moved from the unlock position L1 into the chute 121 by the drive surface 126 until the fall preventer 176 moves to abut against the end of the chute 121 at the tail of the pin 120 (the position shown in fig. 18). At this time, the pin 120 has exited the leg of the connection unit 10, but is held in the hole 175 of the pin holder 170 by the drop preventing member 176, thereby preventing the pin 120 from dropping after exiting the connection unit 10.

In one example, the drive face 126 may be curved or angled. Thus, the curved or angled drive surface 126 facilitates driving the drop prevention member 176 from the unlocked position L2 into the chute 121 as the pin 120 springs outward under the action of the spring 127.

As shown in fig. 13 and 14, the pin holder 170 further includes a flange portion 171 extending from the body thereof. The flange portion 171 of the pin holder 170 has a hole 174 provided therein for accommodating the pivot shaft 124 and is pivotable about the pivot shaft 124. The pivot shaft 124 is inserted into the hole 174 and mounted on the link unit 10, for example, to one leg of the link unit 10 by being inserted into the hole of the flange portion 171 and the hole of the link unit 10. In this manner, pin holder 170 can drive pin 120 to pivot about pivot axis 124 between the first and second mounting portions, for example, from the first mounting portion shown in fig. 11 and 12 to the second mounting portion shown in fig. 13 and 14, and vice versa.

Referring to fig. 19 to 22, there is shown a slide switch device for switching a pin between a first mounting part and a second mounting part of the present invention. The slide switching device includes a slider 200, and the slider 200 is slidably mounted on the link unit 10 (as shown, on the leg 130 of the link unit 10). In one example, the slider 200 may include dovetail slots slidably mounted on the legs. It should be understood that any other suitable structure capable of slidably mounting the slider 200 to the linkage unit 10 may be employed in the present invention. The slider 200 is provided therein with a through hole 210 for receiving the pin 120 and a pin holder (not shown in fig. 19). The pin 120 does not fall out of the through-hole 210 due to the pin holder. When the slider 200 slides on the link unit 10, the pin 120 may slide from the first mount portion to the second mount portion or from the second mount portion to the first mount portion along with the slider 200.

In one example, the crimping tool 1 may further include a slider locking device that locks the slider 200. Referring to fig. 21 and 22, the slider locking means includes a locking pin 242, and the connection unit 10 (particularly, the leg 130 or 150) is provided with a notch 132 to be fitted with the locking pin 242. As shown in fig. 21, the locking pin 242 is partially received in the notch 132, thereby locking the slider 200 at a predetermined position. As shown in fig. 22, the locking pin 242 disengages the notch 132, thereby allowing the slider 200 to slide on the leg 130.

The slider locking device may further include a biasing member that biases the lock pin 242 toward the attachment unit 10. The biasing member may be in the form of a compression spring 243. A spring 243 may be provided at an end of the locking pin 242 opposite to the connection unit 10.

The crimping tool 1 may further comprise a slider unlocking means for disengaging the slider locking means, in particular the locking pins 242, from the connecting unit, in particular the recesses 132. As shown in fig. 19 to 22, the slider unlocking means includes a button 260. The latch 242 may be provided with an inclined surface 241, and one end of the button 260 abuts against the inclined surface 241. The inclined surface 241 is angled with respect to the pressing direction of the button 260. Thus, when the button 260 is pushed, a component force in the longitudinal direction of the lock pin 242 forces the lock pin 242 to move away from the notch 132. In the illustrated example, the lock pin 242 is arranged in a vertical direction, and the button 260 is arranged in a horizontal direction and is pushed in the horizontal direction. It should be understood that the inclined surface 241 (or 141) may also be provided on the button 260 (or 160) so long as the button, when depressed, can actuate the locking pin (or latch) out of the notch (or recess or step).

The end of the button 260 abutting the inclined surface 241 may be tapered or inclined to make point or line contact with the inclined surface 241 of the locking pin 242. In this manner, friction between the button 260 and the latch 242 may be reduced.

The button 260 may have an elongated slot 263 disposed therein. The pin 262 may be inserted into the elongated groove 263 and fixedly installed in the slider 200, thereby mounting the button 260 to the slider 200 and allowing the slider 200 to move a predetermined distance.

A biasing member, such as a spring 261, may also be provided on the button 260 for biasing the button 260 away from the latch 242. In one example, the pin holder may be integrally formed with the slider 200.

The crimping unit in the illustrated example is connected to the connection unit via a side plate, however, it should be understood that the working unit in some hydraulic tools may also be directly connected to the connection unit.

In addition to the first and second mounting portions, the connection unit may further comprise a further mounting portion which is closer to the drive unit or to the working unit of the hydraulic tool than the first and second mounting portions. Such a hydraulic tool can be adapted to more specification working units and can therefore have a wider range of applications.

The foregoing description is for the purpose of describing the principles of the present invention and the function of the various parts thereof with reference to the preferred embodiments illustrated in the drawings, however, it is to be understood that the present invention is not limited to the illustrated embodiments, so long as the structure of the various parts of the hydraulic tool can achieve the above-described functions and purposes. Additionally, it should be understood that the various features of the hydraulic tools described herein may be combined in any combination, or certain feature(s) may be omitted. Many changes may be made to the above-described embodiments without departing from the scope of the invention. Moreover, all the components described herein can be replaced by other technically equivalent components. The scope of the invention should be determined from the following claims.

Claims

1. A hydraulic tool, comprising:

a working unit (30), the working unit (30) being adapted to operate on a workpiece;

a drive unit (20), the drive unit (20) including a movable portion, and the movable portion being configured to drive the working unit (30); and

a connection unit (10), the connection unit (10) being configured to fixedly connect the working unit (30) and the drive unit (20);

wherein the connection unit (10) is provided with a first mounting portion and a second mounting portion, the working unit (30) can be selectively mounted on the first mounting portion and the second mounting portion of the connection unit (10),

wherein the connection unit (10) comprises a base body portion (110), a first leg (130) and a second leg (150) extending in parallel from the base body portion (110),

wherein the working unit (30) is mounted between the first leg and the second leg;

the base portion (110) is connected to the drive unit (20) or is part of the drive unit (20),

wherein the first mounting portion comprises a pair of first holes (131, 151) provided in the first leg (130) and the second leg (150), respectively, for receiving a pin (120) and/or the second mounting portion comprises a pair of second holes (133, 153) provided in the first leg (130) and the second leg (150), respectively, for receiving the pin (120),

wherein the hydraulic tool further comprises a drop prevention device connected to the connection unit (10) for preventing the pin (120) from dropping,

wherein, anti-falling device includes:

a pin retainer (170), the pin retainer (170) including a bore that receives the pin; and

a drop prevention piece (176), the drop prevention piece (176) being provided in the pin holder (170),

wherein the pin (120) is provided with a slide groove (121) extending in the insertion direction thereof, and the drop prevention member (176) is movable along the slide groove (121) but prevents the pin (120) from dropping.

2. A hydraulic tool as in claim 1, wherein the first and second mounts are disposed on a stroke path of the drive unit (20) and spaced apart by a predetermined distance.

3. The hydraulic tool of claim 1, further comprising a pin locking arrangement for selectively locking the pin (120) in the pair of first holes (131, 151) and the pair of second holes (133, 153).

4. A hydraulic tool according to claim 3, wherein the pin (120) is provided with a recess (122) or a step (123), the pin locking means comprising a latch (142) engaging with the recess (122) or step (123) to lock the pin (120).

5. The hydraulic tool of claim 4, wherein the pin locking arrangement further comprises a resilient member (143) biasing the latch (142) towards the pin (120).

6. A hydraulic tool as in claim 4 wherein the hydraulic tool further comprises a pin unlocking means for disengaging the pin locking means from the pin (120).

7. The hydraulic tool of claim 6, wherein the pin unlocking means comprises a push button, one of the push button and the latch (142) comprises an inclined surface at an angle to a pressing direction of the push button,

the other of the button and the latch (142) abuts against the inclined surface such that the button, when depressed, forces the latch (142) to move away from the pin (120).

8. A hydraulic tool as in claim 3 wherein a groove (240) is provided in the first leg and/or the second leg for receiving the pin locking means.

9. The hydraulic tool of claim 6 wherein the pin locking means comprises first locking means for the first mounting portion and second locking means for the second mounting portion; and/or

The pin unlocking device comprises a first unlocking device for unlocking the first locking device and a second unlocking device for unlocking the second locking device; or

The pin unlocking device is configured to be able to unlock the first locking device and the second locking device simultaneously.

10. A hydraulic tool according to claim 6, wherein an elongated slot (164) is provided in the pin unlocking means, and a mounting for mounting the pin unlocking means to the connection unit (10) is received in the elongated slot (164) to allow the pin unlocking means to be movable in the pressing direction (P) when pressed down.

11. A hydraulic tool as in claim 1 wherein the drop prevention device further comprises a first biasing member (177) for biasing the drop prevention member (176) towards the pin (120).

12. A hydraulic tool as in claim 1 wherein the drop prevention member (176) is in the form of a pin.

13. The hydraulic tool of claim 11, wherein the drop prevention device further comprises a mount for mounting the first biasing member (177), the mount being fixedly coupled to the pin holder (170).

14. The hydraulic tool according to claim 1, wherein a countersink (125) recessed with respect to the slide groove (121) is provided at an end of the slide groove (121) near the head of the pin (120),

the drop prevention element (176) locks the pin (120) in the connection unit (10) when it is located in the recess (125).

15. The hydraulic tool of claim 14, wherein the countersink (125) has a locked position (L1) and an unlocked position (L2),

the drop preventer (176) locks the pin (120) in the connection unit (10) when in the locked position (L1) in the countersink (125), and the drop preventer (176) allows the pin (120) to disengage from the connection unit (10) when in the unlocked position (L2) in the countersink (125).

16. The hydraulic tool according to claim 15, wherein a drive surface (126) is further provided between the unlocking position (L2) of the countersink (125) and the chute (121), the drive surface (126) being configured to enable the drop guard (176) to be moved from the locking position (L1) in the countersink (125) into the chute (121) via the unlocking position (L2) when the pin (120) is pressed.

17. A hydraulic tool as in claim 16 wherein the drive surface (126) is curved or sloped.

18. A hydraulic tool as in any of claims 1-17 wherein a flange portion (171) extends from the pin holder (170), the flange portion (171) having a hole (174) disposed therein for receiving a pivot shaft (124), the pivot shaft (124) being mounted on the linkage unit (10) such that the pin holder (170) can pivot about the pivot shaft (124) between the first mount and the second mount.

19. The hydraulic tool of any one of claims 1 to 17, further comprising a slide (200), the slide (200) being slidably mounted on one of the first and second legs, the slide (200) having a through hole (210) provided therein for receiving the pin (120) and the pin holder (170).

20. A hydraulic tool as in claim 19 wherein the hydraulic tool further comprises a slide locking means for locking the slide (200).

21. The hydraulic tool of claim 20 wherein a notch (132) is provided on said one of said first and second legs, said slide locking means comprising a locking pin (242) engaging said notch (132) to lock said slide (200).

22. The hydraulic tool of claim 21 wherein the slide lock device further comprises a second biasing member (243) biasing the locking pin (242) toward the one of the first leg and the second leg.

23. The hydraulic tool of claim 22, wherein the hydraulic tool further comprises a slide unlocking means for disengaging the locking pin (242) from the notch (132).

24. The hydraulic tool of claim 23 wherein the slide unlocking means comprises a push button, one of the push button and the lock pin (242) comprising an inclined surface at an angle to a pressing direction of the push button,

the other of the button and the locking pin (242) abuts against the inclined surface such that the button, when depressed, forces the locking pin (242) to move away from the recess (132).

25. A hydraulic tool as in claim 24 wherein a third biasing member (261) is provided on the button for biasing the button away from the locking pin (242).

26. The hydraulic tool of claim 19, wherein the pin holder (170) is integrally formed with the slide (200).

27. A hydraulic tool as in any one of claims 1 to 17, wherein a pin biasing member (127) is provided on the pin (120) for applying a biasing force to the pin (120) in a direction away from the attachment unit (10).

28. The hydraulic tool of any one of claims 1-17 wherein the first and second mounting portions are configured to accommodate selective mounting of work units having different specifications.

29. A hydraulic tool as claimed in any one of claims 1 to 17, wherein the stroke of the movable part of the drive unit (20) when the working unit (30) is mounted to the first mounting portion of the linkage unit (10) is between 90mm and 110 mm.

30. A hydraulic tool as claimed in any one of claims 1 to 17, wherein the stroke of the movable part of the drive unit (20) when the working unit (30) is mounted to the first mounting portion of the linkage unit (10) is 100 mm.

31. A hydraulic tool as claimed in any one of claims 1 to 17, wherein the stroke of the movable part of the drive unit (20) when the working unit (30) is mounted to the second mounting portion of the linkage unit (10) is between 35mm and 50 mm.

32. A hydraulic tool as claimed in any one of claims 1 to 17, wherein the stroke of the movable part of the drive unit (20) when the working unit (30) is mounted to the second mounting portion of the linkage unit (10) is 41 mm.

33. The hydraulic tool of any one of claims 1 to 17 wherein the hydraulic tool is a crimping tool, a clamping tool or a shearing tool.