CN2208471Y - Electric spanner - Google Patents

Abstract

The utility model relates to an electric spanner comprising an impact block which is pivoted on an impact bracket. A protruded part is arranged on one end of the impact block, and the end of the impact block is adjacent to the impact bracket. Two corresponding centrifugal weight bodies, a left one and a right one, are pivoted on the impact bracket. One spring is arranged one end of each of centrifugal weight bodies in a hook way, and the end of each of centrifugal weight bodies is far away from the pivoted end of each of centrifugal weight bodies and is provided with a wrap around edge surface. Besides, the wrap around edge surface can wrap the protruded part of the impact block, and an impact bar which can drive a tool assembly to rotate is sheathed on the front end of the coupled bar arranged on the impact bracket. Due to the components of the utility model, when the rotary speed of a motor achieves a set value, the two centrifugal weight bodies adopting the pivoted ends as axle centers are thrown out. Thus, wrap actions to the impact block are stopped, and the impact block is enabled to swing in a deflection way and poke the impact bar to act.

Description

Electric spanner

The utility model relates to a kind of electric wrench, the electric wrench of particularly a kind of simple element, preferable, the assembling of action and counterweight processing ease.

Electric wrench is a kind of instrument that utilizes motor power to come the loading and unloading assembly, as shown in Figure 1, electric wrench was to be assembled with one to impact frame 11 in a casing (figure does not show) in the past, impact frame 11 and have two parallel portion 111, two parallel portion 111 be provided with corresponding before, back axis hole 112,113, back axis hole 113 aperture peripheries are outward extended with the extension 114 of a hollow, set up a brake block 12 in the back axis hole 113 with central perforation, the prominent rib of mat of assembling in the central perforation of brake block 12, the clamping of groove mode phase, and in be provided with the trace 13 of bearing, be arranged with a spring 131 on the body of rod of trace 13, button is established a clasp 133 on the end 132 of trace 13, the axostylus axostyle 101 of this end 132 and a motor 10 socket-connects, interlock, other end pivot bush unit one impact bar 14 that trace 13 and end 132 are relative, impact bar 14 is provided with an alar part 141.The breach 115 place's mats one slotting axle 15 that impacts 111 of 11 liang of parallel portion of frame is assembled with an impact block 16, this impact block 16 is the inside beat in axle center to insert axle 15, and the alar part of stirring on the impact bar 14 141 makes its rotation, when impact bar 14 rotations, rotate synchronously but stretch out impact frame 11 outer end interlock tool assemblies.

As shown in Figure 2, it is the part assembling cross-sectional schematic of electric wrench in the past, in the past electric wrench 1 for make impact bar 14 under certain rotating speed by transmission, extension 114 peripheries that impact frame 11 are provided with several parallel perforations 117, assemble the alignment pin 17 of a length in each perforation 117 respectively greater than the thickness of parallel portion 111, extension 114 outer peripheral edges are utilized centrifugal device 2 of a clasp 20 assemblings, centrifugal device 2 has a pedestal 21 that can be set on the extension 114, pedestal 21 is outward extended with two and has corresponding, the location-plate 211 of ovalize locating hole 212, plug a locating shaft 22 in the locating hole 212 of two location-plates 211 respectively, on the outstanding ends of locating shaft 22 respectively hook establish a spring 23 parallel with location-plate 211, assemble one centrifugal 24 on the locating shaft 22 that two location-plates are 211 respectively, two corresponding end pin 241 of centrifugal 24 projection, can shore a locating ring 25 outer moving simultaneously, 241 on two ends pin forms a linkage section, which is provided with counterweight 26.

Under no centrifugal action, two locating shafts 22 of centrifugal device 2 are subjected to the drawing of spring 23 and draw close mutually, shore locating ring 25 outer moving for centrifugal 24 that are hubbed on two locating shafts 22, because the length of alignment pin 17 is greater than the thickness of the parallel portion 111 of impacting frame 11, so, under the shoring of locating ring 25, can cause in the alignment pin 17 prominent, move in the brake block 12 and shore, with restriction impact block 16 beats.When motor 10 has just begun to rotate, the centrifugal force that is produced also can't drive the centrifugal 24 outwards swing that centrifugal device 2 has counterweight 26, the kind of drive of whole electric wrench will be as shown in Figure 2, ring 25 pushes against, alignment pin 17 is shored because of brake block 12 still is positioned, and limited the swing of impact block 16, though motor 10 can transmission traces 13, impact frame 11 and impact block 16 rotates, but can't beat because impact block 16 is restricted, impact bar 14 not also be stirred and is the state that does not change.That is to say, when motor 10 rotating speeds do not reach setting value, impact the rotation of frame 11 and impact block 16, can not rotate by transmission impact bar 14.

As Fig. 2, shown in 3, when 11 turns such as member such as grade of motor 10 transmissions impact frame arrive predetermined rotating speed, two centrifugal 24 of centrifugal device 2 will outwards throw away because of the elastic force that centrifugal action overcomes spring 23, and originally by two centrifugal 24 high locating rings 25 do not shored and trace 13 on be arranged with under the situation of spring 131, be subjected to the outer support of spring 131, brake block 12 and alignment pin 17 can be pushed up outward, the impact block 16 that makes script be limited to swing can be forward, back axis hole 112,113 get rid of into, and stir impact bar 14 and rotate, and then drive the tool assembly rotation of interlock.On the contrary, in the process that drives, if tool assembly is subjected to resistance, and motor 10 be can't run well the time, and under the effect of counterweight 26, two centrifugal 24 of centrifugal device 2 also can be reduced because of centrifugal force, and little by little return to the state of Fig. 2 by Fig. 3, make impact frame 11 no longer drive impact bar 14 and rotate, motor 10 rotating speeds return to when setting rotating speed by the time, because centrifugal 24 centrifugal action just can be stirred impact bar 14 rotations once again.

Electric wrench utilized alignment pin 17 assemblings of centrifugal device 2 and cooperation in the past, nearly more than ten of the members of above-mentioned centrifugal device 2, comparatively loaded down with trivial details in the manufacturing, and, in the driving process,, need order about also that brake block 12, alignment pin 17 and locating ring 25 are axially outer to be moved by the balance of 131,23 on spring except two centrifugal 24 simultaneously outwards the whipping, need the member of action more, make accuracy of action relatively poor.When counterweight 26 was undesirable, its improvement mode must be changed the outfit the counterweight 26 that originally is riveted on centrifugal 24, also suitable trouble on adjusting.

The purpose of this utility model is to provide a kind of to be had structure and simplifies, moves the electric wrench of certain centrifugal control device.

Of the present utility model being characterised in that: the impact frame on this electric wrench is pivoted with an end of two relative governor weight bodies, two governor weight bodies are provided with a spring away from hook between an end that is pivoted, make electric wrench when centrifugal force does not reach setting value, utilize spring obvolvent impact block, to avoid its beat.When the governor weight body under the motor transmission, knowing from experience to articulate an end because of governor weight is the outside beat of fulcrum, one end of the impact block of obvolvent originally makes impact block no longer can be driven beat by obvolvent because of being thrown out of no longer obvolvent, to stir corresponding impact bar rotation.

Electric wrench of the present utility model comprises an impact frame that is provided with two parallel portion, impact frame and be provided with axis hole, assembling socket-connects in the axis hole impact bar, trace and axle sleeve, utilize one to insert the impact block that can swing of axle assembling between two parallel portion, impact block has a protuberance, and protuberance plugs an alignment pin vertical with inserting axle.Impacting on the parallel portion in the frame utilizes two pivot pins to be respectively equipped with symmetrical governor weight body, the governor weight body is provided with counterweight portion, establish a spring away from hook between pivot pin one end, make the two keep closing, but form the obvolvent edge face that the frame corresponding position is impacted in an obvolvent on away from the end of pivot pin, but and the location indentations of an outstanding alignment pin of obvolvent at this.Under no centrifugal action, two governor weight bodies are subjected to the drawing of spring, and obvolvent edge face can be with the protuberance obvolvent of impact block, and the location indentations on the pedestal is the laterally projecting alignment pin of obvolvent also, to prevent the impact block beat and to stir the impact bar rotation.When two governor weight bodies were subjected to centrifugal action to be the outside beat in center with the pivot pin simultaneously, impact block is beat under unrestricted state just, to stir corresponding impact bar action.

Below by most preferred embodiment and accompanying drawing electric wrench of the present utility model is elaborated, in the accompanying drawing:

Fig. 1 is a kind of perspective exploded view of electric wrench in the past.

Fig. 2 is a kind of combination cross-sectional schematic of electric wrench in the past.

Fig. 3 is a kind of action schematic diagram of electric wrench in the past.

Fig. 4 is the three-dimensional exploded view of the utility model preferred embodiment.

Fig. 5 is the horizontal cross-sectional schematic of the combination of the utility model preferred embodiment.

Fig. 6 is the centrifugal action schematic diagram of the utility model preferred embodiment.

As shown in Figure 4, the electric wrench of the utility model preferred embodiment also has one and impacts frame 31,311 of the two corresponding parallel portion of impacting frame 31 also one on mat are inserted the impact block that can swing 33 of axle 32 assemblings, before forming respectively on two parallel portion 311, back axis hole 312,313,311 of two parallel portion are provided with a locating shaft 315, an also sheathed axle sleeve 34 in the back axis hole 313, a spring 35, and trace 36 that shored by spring 35, trace 36 protrudes in and impacts frame 31 outer ends 362 and buckle and be provided with a clasp 361, this end 362 and and the axostylus axostyle 301 of motor 30 socket-connect, interlock, trace 36 be positioned at impact frame 31 1 ends then with impact bar 37 pivot bush units, impact bar 37 has outstanding alar part 371, and alar part 371 is corresponding with the impact block 33 on impacting frame 31.

Shown in Fig. 4,5, impact block 33 is provided with a column protuberance 331 with radial perforation 332, perforation plugs an alignment pin 38 vertical with inserting axle 32 in 332, after being provided with, impact frame 31 is penetrated with the jack 314 of two left and right correspondences on the parallel portion 311 of axis hole 313, plug the pivot pin 39 of a left and right correspondence in the jack 314 respectively, be provided with an axle spring 391 and a governor weight body 4 on the body of rod of each fulcrum pin 39, pivot pin 39 stretches out jack 314 outer ends and is snapped with a clasp 392.Governor weight body 4 is pedestals of one and a half months shape, one end is provided with a locating hole 41 that supplies pivot pin 39 to wear, notch part 42 near locating shaft 315 correspondences on one of centre formation and the impact frame 31, notch part 42 lateral borders form a counterweight portion 43 of outwards giving prominence to and can increase and decrease according to need weight, the place ahead has a concave surface 44, form the dog hole 441 that ammunition feed spring 45 1 end hooks are established on the concave surface 44, governor weight body 4 forms a semicircular obvolvent edge face 46 away from an end of locating hole 41, indent forms a location indentations 47 of occuring simultaneously mutually on this obvolvent edge face 46, the protuberance 331 of obvolvent edge face 46 and impact block 33 matches, and the location indentations 47 of two correspondences can hug the alignment pin 38 that is plugged on the location division 331.

When present embodiment in when assembling, this assembling mode that impacts frame 31, impact block 33, impact bar 37, axle sleeve 34, trace 36 is with identical in the past.Two governor weight bodies, 4 one ends are that mat pivot pin 39 be located on the impact frame 31 accordingly, spring 45 two ends hook respectively are located in the dog hole 441 of two governor weight bodies 4, make of the end phase closing of two governor weight bodies 4 away from locating hole 41, and 46 armfuls in the obvolvent edge face that makes governor weight body 4 is located on the protuberance 331 of impact block 33, horizontal location indentations 47 also obvolvent can't swing it with location impact block 33 on alignment pin 38.When the motor 30 that drives trace 36 moves, when rotating speed does not reach setting value as yet, though impacting frame 31 can rotate because of the interlock of trace 36 with impact block 33, but because the protuberance 331 of impact block 33 is subjected to the obvolvent of two corresponding governor weight bodies 4, impact block 33 inwardly beat is stirred the alar part 371 of impact bar 37, at this moment, the tool assembly that is connected impact bar 37 the place aheads still can't be driven.

Shown in Fig. 4,6, when motor 30 drove traces 36 and forwards setting value to, two corresponding governor weight bodies 4 will be the outside beat of elastic force that the axle center overcomes spring 45 with pivot pin 39 because of action of centrifugal force, make originally be limited can't deflection alignment pin 38 deflections.When impact block 33 is not subjected to double team, inside beat just, and stir impact bar 37 swings, and then drive the tool assembly that connects and rotate.In the same manner, when tool assembly is subjected to resistance and makes the rotating speed of motor 30 be reduced to setting value when following, two governor weight bodies 4 have obvolvent edge face 46 1 ends will be because of the drawing phase closing of spring 45, and embrace and to be located on the protuberance 331 of impact block 33, horizontal location indentations 47 also can double team alignment pin 38, impact block 33 can't be swung and stop the impact of impact bar 37, when motor 30 rotating speeds recover normal and cause two governor weight bodies 4 outwards to throw away by the time, the impact block 33 of beat just can drive impact bar 37 and rotate, to produce necessary operation.

The purpose that pivot pin 39 of the present utility model is provided with spring 391 is more smooth and easy when being to make governor weight body 4 to rotate.The utility model is when adjusting counterweight, as long as just passable to the thickness or the width increase and decrease of the counterweight portion 43 of two governor weight bodies 4, so also comparatively convenient on adjusting.

The utlity model has following effect: as can be known by above explanation, the utility model is impacting on the frame 31 directly with the be pivoted governor weight body 4 of two correspondences of two pivot pins 39,4 hooks of governor weight body are established a spring 45, it is provided with one and impact block 33 protuberances 331 corresponding obvolvent edge faces 46 away from pivot pin 39 places that are pivoted, in these obvolvent edge face 46 leading edges a location indentations 47 is set again, make its obvolvent on the alignment pin of being located on the impact block 33 38, control impact block 33 beats by this.Above-mentioned structure, the control structure of more than ten member compared with needed nearly in the past, more simplify, and, have only two governor weight bodies 4 outwards to throw away during action, in action, there is not the continuous action relation between member, so, move also smooth and easy.And simple member also can make article more easy in assembling, and the mode of operation during the increase and decrease counterweight also more in the past electric wrench is simple.So the utility model has the shortcoming of simple element, preferable, the assembling of action and counterweight processing ease really.

Claims (3)

1, a kind of electric wrench comprises an impact frame with forward and backward axis hole, and one on mat is inserted axle and is pivoted with the impact block that can swing on the impact frame, is equipped with an axially axle sleeve of correspondence on the forward and backward axis hole of impact frame, it is characterized in that:

Form a protuberance on the described impact block, be inserted with an alignment pin vertical on the protuberance with inserting axle, two fulcrum pins that impact frame are provided with two corresponding governor weight bodies, one end of each governor weight body is provided with the locating hole that this pivot pin of confession wears, form a counterweight portion on each governor weight body, two governor weight bodies are provided with a spring away from hook between an end of locating hole, form the obvolvent edge face that matches with the impact block protuberance on this end end, obvolvent edge face lateral border forms a location indentations that cooperates with alignment pin.

2, electric wrench as claimed in claim 1 is characterized in that:

Described impact frame is provided with locating shaft, corresponding to the locating shaft place that impacts on the frame, is provided with corresponding notch part on this governor weight body.

3, electric wrench as claimed in claim 1 is characterized in that:

Described pivot pin stretches out an end that impacts frame and buckles and be provided with a clasp, and pivot pin is provided with one and shores governor weight and show consideration for and lean against the spring that impacts on the frame.

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