This application is the United States national phase of International Application No. PCT/CN2014/082038 filed Jul. 11, 2014, the disclosure of which is hereby incorporated in its entirety by reference.
The invention relates to a hand tool, and, in particular, relates to a wrench used for clamping a flat plate, a nut, and especially pipe fittings such as a steel pipe, a plastic pipe, etc.
In daily lives or works, a wrench is frequently used for clamping an object, such as for clamping pipe fittings such as a steel pipe, a plastic pipe etc., to implement loosening and tightening of mounting or dismounting. A traditional wrench, such as a pipe wrench, for clamping pipe fittings is generally composed of a fixed jaw, a movable jaw, a handle, an adjusting nut, etc. The fixed jaw is fixed together with the handle in a sophisticated structure. The traditional pipe wrench accomplishes opening and closing relying on the transmission by the thread pair between the nut and the movable jaw. In use, the adjusting nut is rotated constantly to enable the change in the opening size of the movable jaw relative to the fixed jaw by adjusting the sliding movement of the movable jaw, and, therefore, the operation is very inconvenient. Meanwhile, the opening and closing speed of the jaws of a traditional pipe wrench is limited by the pitch of the thread pair, unable to realize fast opening and closing of the jaws.
In view of the above defects in the prior art, the technical problem to be solved by the invention is to provide a wrench which has simple structure, flexibility of opening and closing, fast adjusting speed, convenience and reliability in using. The wrench can be used for clamping and rotating a pipe fitting, and also for clamping objects in other shapes such as a flat plate, a nut, etc.
In order to achieve the above object, the invention provides a wrench, the structure of which comprising: a guide rod, a first pawl mounted on the guide rod, a sliding member sheathed on the guide rod, and a second pawl mounted on the sliding member and matching with the first pawl, characterized in that, the wrench further comprises a toothed block disposed on the sliding member and matching with the guide rod, the toothed block having a first position and a second position; the wrench is configured such that: when the toothed block is in the first position, the toothed block is locked; when the toothed block is in the second position, the toothed block is unlocked.
Further, the first position refers to a position where the toothed block is located when the toothed block is engaged with the guide rod; the second position refers to a position where the toothed block is located when the toothed block and the guide rod are detached.
Further, when the toothed block is in the first position, the toothed block is slidable along the guide rod toward the first pawl, and is locked in the direction away from the first pawl; when the toothed block is in the second position, the toothed block is slidable along the guide rod toward or away from the first pawl.
Further, an engagement portion where the guide rod is engaged with the toothed block is provided with unidirectional teeth having a unidirectional orienting effect: when the sliding member is pushed toward the first pawl, the toothed block is slidable along toothed surface of the unidirectional teeth, so that the sliding member moves along the guide rod and comes close to the first pawl; when the sliding member is pushed away from the first pawl, a sliding movement of the toothed block along toothed surface of the unidirectional teeth is obstructed, so that a sliding movement of the sliding member along the guide rod is locked.
Further, the sliding member is provided with a sloping surface matching with the toothed block, a first angle provided between the sloping surface and the guide rod; the first angle enabling the toothed block to be subject to an acting force perpendicular to the guide rod and pointing toward the guide rod when the wrench is clamping a workpiece, the acting force facilitating the engagement of the toothed block and the guide rod.
Further, the first angle is arranged to be less than 90°.
Further, an engagement portion where the guide rod is engaged with the toothed block is provided with unidirectional teeth having a toothed surface, the toothed surface obstructs the sliding movement of the toothed block away from the first pawl, a second angle provided between the toothed surface and the sloping surface, the second angle enabling the unidirectional teeth to still be able to lock the toothed block when the unidirectional teeth deform.
Further, the second angle is arranged to be more than 0°.
Further, a reserved space is arranged between the toothed block and the sliding member, the reserved space enabling the toothed block to rotate by an angle allowing the toothed block to conquer the locking of the toothed block with respect to the guide rod produced due to the second angle, so that the toothed block is detached from the guide rod; meanwhile, the reserved space enables a plurality of teeth on the toothed block to automatically locate position to be engaged with the guide rod.
Further, the wrench also includes a connecting rod provided at both sides of the guide rod and connected to the toothed block.
Further, the wrench also includes a pushbutton connected to the toothed block by the connecting rod, when a pressing force is applied to the pushbutton, the connecting rod being able to transfer the pressing force to the toothed block, so that the toothed block is detached from the guide rod; when the pressing force applied to the pushbutton is canceled, the toothed block is reset to be engaged with the guide rod.
Further, a third angle is provided between the connecting rod and the sloping surface, and meanwhile, a fourth angle is provided between the connecting rod and the guide rod, the third angle and the fourth angle enabling the pressing force to which the pushbutton is subject to conquer the friction force between the toothed block and the sloping surface, so that the toothed block is detached from the guide rod.
Further, the third angle and the fourth angle are both less than 90°. Further, the wrench also includes a pushbutton and a connecting rod, the pushbutton, the connecting rod and the toothed block formed into a connecting member provided to be sheathed on the guide rod.
Further, the sliding member is provided with a first portion extending along the guide rod toward the first pawl, and the second pawl is embedded in the first portion.
Further, the sliding member is also provided with a second portion provided to be sheathed on the guide rod, the second portion being provided with a cavity arranged therein, the connecting member being arranged in the cavity.
Further, a portion of the pushbutton is embedded in the cavity, and another portion of the pushbutton protrudes out of the sliding member.
Further, the second pawl is provided with a hang tab embedded in the second portion and fixedly connected to the second portion by a pin rod.
Further, the wrench also includes a clamping surface provided on the first pawl and the second pawl.
Further, the first pawl is connected to the guide rod by a fixing pin arranged with a snap slot used for mounting a snap ring.
Further, a first spring is provided between the first pawl and the guide rod, and when a workpiece is clamped, the first spring can push the first pawl to move, so as to produce pre-tightening force in the workpiece.
Further, the wrench also includes a second spring being able to apply pressing force to the toothed block.
Further, one end of the second spring contacts the toothed block, and the other end contacts a coverplate fixedly connected to the sliding member.
Further, the outside of the sliding member is provided with a first concave part, and the coverplate is embedded in the first concave part, the coverplate fixedly connected to the sliding member by a screw.
Further, the screw is a flat screw, and a gap exists between the screw and the toothed block.
Further, the sliding member is also provided with a thumb abutting part facilitating an operator to push the sliding member to move, a surface of the thumb abutting part is provided with a second stripes, slots parallel to each other being between the second strips, for increasing the friction between the fingers of the operator and the thumb abutting part.
Further, the first spring is a spiral spring.
Further, the pushbutton surface is provided with a first stripes, slots parallel to each other being between the first strips, for increasing the friction between the fingers of the operator and the pushbutton.
Further, the clamping surface is provided with teeth used for increasing the friction between the clamping surface and the clamped workpiece.
Further, the second spring is a compressed spring.
Further, both sides of the guide rod are provided with a recess extending across the whole guide rod, such that, the connecting rod at either side of the guide rod is not in complete contact with the side of the guide rod, facilitating the toothed blocking to slide along the guide rod.
Further, the guide rod is provided with a grasp part which is a protection sleeve surrounding about the guide rod.
Further, the protection sleeve is fixedly connected to the guide rod by a fastener.
Further, the fastener is composed of a nut and a bolt.
Further, the protection sleeve is provided with a second concave part, and the nut is embedded in the second concave part.
Further, the protection sleeve is also provided with a hang hole, used for hangingly position the wrench.
The invention has the following advantages:
Referencing now to the figures, the conception, detailed structure and induced technical effect of the present invention will be expounded for due understanding of the purpose, characterizations and effects of the present invention.
Now the invention is further described in combination with the accompanying figures and embodiments.
The wrench 100 is configured such that: when the toothed block 34 is in the first position, the toothed block 34 is engaged with the guide rode 2, and the toothed block can slide along the guide rod toward the first pawl 1, and is locked in the direction away from the first pawl 1; when the toothed block 34 is in the second position, the toothed block 34 is detached from the guide rod 2, and the toothed block 34 can slide along the guide rod 2 toward or away from the first pawl.
In an embodiment of the invention, the first position refers to a position where the toothed block 34 is located when the toothed block 34 is engaged with the guide rod; the second position refers to a position where the toothed block 34 is located when the toothed block 34 and the guide rod 2 are detached.
As shown in
As shown in
As shown in
The first pawl 1 is pivotedly connected to the guide rod 2 by the fixing pin 12. The fixing pin 12 is arranged with a snap slot 120. A snap ring 121 is disposed in the snap slot 120, such that the fixing pin 12 will not fall out from inside the mounting holes of the guide rod 2 and the first pawl 1. A first spring 13 is also arranged between the first pawl 1 and the guide rod 2. As noted above, under the effect of the restoring force of the first spring 13, the first pawl 1 and the second pawl 32 can produce pre-tightening force in the clamped workpiece when clamping a workpiece, so that slippage will not occur to the wrench 100 when in screwing operation.
The wrench body 100 also includes a sliding member 31 including a first portion 310 extending along the lower part of the guide rod 2 toward the first pawl 1, the end part thereof, i.e. the portion close to the first pawl 1 being provided with a slot provided with a second pawl 32 embedded therein. As shown in
The sliding member 31 also includes a second portion 311 provided with a cavity 312 arranged therein. A toothed block 34 is arranged inside the cavity 312. The toothed block 34 is coupled to the pushbutton 33 though a connecting rod 39. A pin 40 is used for connection between the connecting rod 39 and the toothed block 34, or the connecting rod 39 and the pushbutton 34. At least two connecting rods 39 are, parallel to each other, connected to the two sides of the pushbutton 33 and the toothed block 34 (see
In a preferred embodiment of the invention, the surface of the pushbutton 33 is arranged with a first stripes 330. Slots parallel to each other are between the first strips 330, which, in another embodiment, can also be staggered slots, for increasing the friction between the fingers of the operator and the pushbutton 33, and preventing slippage when the fingers of the operator contact the pushbutton 33, which tempers using. The two sides of the guide rod 2 are arranged with recesses 24 extending across the whole guide rod 2, such that, the connecting rods 39 at both sides of the guide rod 2 are not in complete contact with the sides of the guide rod 2, to facilitate the fast sliding movement of the toothed block 34 along the guide rod 2.
The outside of the second portion 311 of the sliding member 31 is provided with a first concave part 313 which is communicated with the cavity 312 for embeddingly arranging the coverplate 36 that fixedly connected to the sliding member 31 by a screw 38. Preferably, the screw 38 is a flat screw, that is, its end part is flat. A gap is reserved between the end part of the screw 38 and the toothed block 34. A second spring 37 is arranged between the coverplate 36 and the toothed block 34. The both ends of the spring 37 are respectively in contact with the toothed block 34 and the coverplate 36 (see
In addition, the outside of the second portion 311 of the sliding member 31 is also provided with a thumb abutting part 35 facilitating the operator to push the sliding member 31. The surface of the thumb abutting part 35 is provided with a second stripes 350. Slots parallel to each other are between the second strips 350, for increasing the friction between the fingers of the operator and the thumb abutting part 35.
When the start position of the second pawl is closed to the grasp part 200, as shown in
When the start position of the second pawl 32 is closed to the first pawl 1 (see
As shown in
In another aspect, in order to allow realizing reliable locking using friction self-locking between the toothed block 34 and the sloping surface 314, and also realizing fast detachment of the toothed block 34 and the guide rod 2 by conquering the friction self-locking between the toothed block 34 and the sloping surface 314 when pushing down the pushbutton 33. The angle between the connecting rod 39 and the guide rod 2 is a fourth angle, which is arranged to be less than 90° and the angle γ between the connecting rod 39 and the sloping surface 314 γ is less than 90°, such that when pressing down the pushbutton 33, the pushbutton 33 applies a downward force to the toothed block 34 through the connecting rod 39. The force can be divided to be a branch force perpendicular to the sloping surface 314 and a downward branch force parallel to the sloping surface 314. The smaller the angle γ is, the larger downward branch force to which the toothed block 34 is subject, and the branch force perpendicular to the sloping surface 314 is smaller, and the upward friction to which the toothed block 34 is subject is smaller, and the toothed block 34 are more readily to conquer the friction to slide downward along the sloping surface 314 so as to achieve the detachment from the guide rod 2 and to be unlocked.
In order to ensure the wrench of the invention can still lock the toothed block 34 and not let it to be detached from the guide rod 2 when the wrench is under stressed condition and the unidirectional teeth 15 deform, the angle β between the sloping surface 314 and the toothed surface 152 of the unidirectional teeth 15 is arranged to be more than 0°, and the larger the angle β, the more reliable the locking of the toothed block is. But in the mean time it needs to be rotated by an angle to conquer the locking of the toothed block and the guide rod brought by the angle β, so as to detach the teeth on the toothed block 34 and the teeth on the guide rod 2. Therefore a certain space 316 is required to be reserved between the sliding member 31 and the cavity in the cavity 312 to allow the toothed block 34 to rotate in the cavity 312 so as to detach the teeth of the two. Meanwhile, the reserve space 316 can also ensure the plurality of the teeth on the toothed block 34 to automatically find position and reliably come into contact with the guide rod 2 so as to increase the strength between the teeth.
In a preferred embodiment of the invention, α=45°, β=15°, γ=40°.
The foregoing described the preferred embodiments of the present invention. It should be understood that an ordinary one skilled in the art can make many modifications and variations according to the concept of the present invention without creative work. Therefore, any person skilled in the art can get any technical solution through logical analyses, deductions and limited experiments, which should fall in the protection scope defined by the claims.
Filing Document | Filing Date | Country | Kind |
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PCT/CN2014/082038 | 7/11/2014 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2016/004619 | 1/14/2016 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
539031 | Born | May 1895 | A |
1875646 | Pasquale | Sep 1932 | A |
1987353 | Vetrano | Jan 1935 | A |
1999076 | Bauman | Apr 1935 | A |
2050102 | Kujala | Aug 1936 | A |
2253895 | Denovich | Aug 1941 | A |
2319647 | Vautrot | May 1943 | A |
2365139 | Newberry | Dec 1944 | A |
2369346 | Gearhart | Feb 1945 | A |
2420714 | Mead | May 1947 | A |
2437801 | Andersen | Mar 1948 | A |
2448999 | Mead | Sep 1948 | A |
2543824 | Beesley | Mar 1951 | A |
2612808 | Small | Oct 1952 | A |
2957378 | Foss | Oct 1960 | A |
3039338 | Borg | Jun 1962 | A |
3625096 | Myers | Dec 1971 | A |
3956949 | Romano | May 1976 | A |
4028969 | Politte | Jun 1977 | A |
4144779 | Honick | Mar 1979 | A |
4712455 | Cox | Dec 1987 | A |
5832793 | Collins | Nov 1998 | A |
6026716 | Orlosky | Feb 2000 | A |
6938525 | Poole et al. | Sep 2005 | B2 |
8485073 | Lopez | Jul 2013 | B1 |
20030183048 | Olsen | Oct 2003 | A1 |
20040074345 | Huang | Apr 2004 | A1 |
20060196319 | Hung et al. | Sep 2006 | A1 |
20090193940 | Kuo | Aug 2009 | A1 |
Number | Date | Country |
---|---|---|
1535198 | Oct 2004 | CN |
201856195 | Jun 2011 | CN |
102632474 | Aug 2012 | CN |
103692390 | Apr 2014 | CN |
203993655 | Dec 2014 | CN |
4229221 | Mar 1994 | DE |
1020130123665 | Nov 2013 | KR |
Number | Date | Country | |
---|---|---|---|
20170157748 A1 | Jun 2017 | US |