CN102729214B

CN102729214B - Electric hammer

Info

Publication number: CN102729214B
Application number: CN201110091475.2A
Authority: CN
Inventors: 魏淦
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2011-04-13
Filing date: 2011-04-13
Publication date: 2015-07-15
Anticipated expiration: 2031-04-13
Also published as: CN102729214A

Abstract

The invention provides an electric hammer, which includes: an enclosure, which supports a nail striking device; a motor placed inside the enclosure, a motor-driven transmission mechanism and an impact assembly. The impact assembly contains an impact wheel and an intermediate shaft supporting the impact wheel, the impact portion of which impacts the stricken shaft of the nail striking device. The intermediate shaft is rotatably supported on a first supporting member and a second supporting member, which are respectively located on two sides of the impact assembly. The transmission mechanism includes a first transmission member and a second transmission member, with the first transmission member in driving connection with the intermediate shaft, wherein the axis of the first transmission member is parallel to the axis of the second transmission member. The electric hammer of the invention has a compact structure and small size, and especially the distances between center of the its striking shaft and the two sides of the head of the enclosure are shorter, so that striking operation on a nail in a narrow spatial position, such as a corner is more likely to realize functionally.

Description

Electric hammer

Technical field

The present invention relates to a kind of electric tool, particularly relate to a kind of electric hammer that can realize that the securing members such as nail are impacted.

Background technology

Electric hammer is a kind of conventional hand-held tool, and it is of a great variety.According to power source, electric hammer can be divided into pneumatic and electronic two large classes.Wherein, pneumatic electro hammer must have compressed air source in addition, therefore uses limited.The basic structure of electric hammer can be summarized as: the motor be placed in rifle body is connected with the nail hitting bar being placed in rifle head place by rotation-straight motion transmission device, thus under switch control rule, can converts electrical energy into reciprocating mechanical energy.

The pct international patent application of the patent No. to be the United States Patent (USP) of US6431430 and publication number be WO2006/008546 all discloses using slider-crank mechanism as rotation-straight motion transmission device and using battery as the electric hammer of power supply.This type of electric hammer Problems existing one is the impact that slider-crank mechanism can not realize truly, and be in fact a kind of " pushing away " nailing machine structure, when providing same motor power, ejector pin efficiency is far below the efficiency of nail hitting; Two is in each ejector pin process, and slider-crank mechanism must promote ejector pin element and to advance identical stroke, when nail run into hard object cause running resistance excessive time, be easy to cause motor rotation blockage, cause motor damage; Three is that motor is placed in handle front or rear side, is connected occupies larger space with transmission mechanism, makes electric hammer volume comparatively large, carries and operate use convenient all not.

Number of patent application be 200410088827.9 Chinese patent application disclose a kind of rotation by motor by pinion and rack and be first converted to the active force of Compress Spring, relend and help tripping mechanism to discharge Compress Spring, thus produce the electric hammer of impulsive force.Although this electric hammer utilizes spring energy-storage, achieve and the moment of nail is impacted, but can only successively click, cannot impact continuously, and only by spring release energy produce impact force efficiency not high, cause this electric hammer to be not suitable as conventional tool and often use; In addition, its motor is in the casing below rifle head, separates completely with handle, still there is the problem that structure is not compact.

Summary of the invention

For the shortcoming that above-mentioned prior art exists, the invention provides a kind of electric hammer of compact conformation.

In order to reach above object, technical scheme of the present invention is:

A kind of electric hammer, comprises: casing, is supported with nail hitting unit, be placed in the motor in casing, by motor-driven transmission mechanism and impact assembly, described impact assembly comprises beater wheel and supports the jackshaft of described beater wheel, the impact part of beater wheel impact described nail hitting unit by impact axle, jackshaft is rotatably supported on the first support member and the second support member, first support member and the second support member lay respectively at the both sides of described impact assembly, flexible of topmast between beater wheel and the first support member, wherein, described first support member has near the first end of described beater wheel and the second end away from described beater wheel, multiple first support portion is also extended towards described first end in position between described first end and described second end, the number of described elastic component is corresponding with the number of described first support portion, each described elastic component part to be sheathed on described first support portion and topmast on the described position between the described first end and described second end of described first support member, described elastic component and described first support member are staggered along axially having of described jackshaft.

Further, transmission mechanism comprises the first driving member and second driving member of vertical duction transmission, and the first driving member drives with described jackshaft and is connected, and the installation axis of described second support member and described second driving member is in the homonymy of described first driving member.

Further, the installation axis of the second support member and described second driving member is in together between the beater wheel of shown first driving member and described impact assembly.

Transmission mechanism in such scheme can also adopt another kind of form, and transmission mechanism comprises the first driving member and the second driving member, and the first driving member drives with described jackshaft and is connected, the axis of described second driving member and the axis being parallel of the first driving member.

By adopting technique scheme, electric hammer of the present invention can realize hitting periodically continuously securing members such as nails on the one hand, whole implement structure is compact on the other hand, compact size, the particularly distance of the centre-to-centre spacing case head both sides of its impact axle are shorter, functionally more can realize being on small space position, the impact operation of the nail of such as corner.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of electric hammer of the present invention, and wherein, see its internal structure for clear, half housing is removed;

Fig. 2 is the schematic diagram along Tu1ZhongA-AXian partial cross section, shows a kind of embodiment constructed between each parts in casing;

Fig. 3 is the another kind of embodiment of each piece construction;

Fig. 4 is another embodiment constructed between each parts;

Fig. 5 is the schematic diagram along Tu1ZhongA-AXian partial cross section, shows another embodiment constructed between each parts in casing.

Detailed description of the invention

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

As shown in Figure 1, for the schematic diagram of electric hammer 1 of the present invention, electric hammer 1 comprises casing 3, casing 3 is involuted by two halves housing, its main part forms the grab handle 31 of a longitudinally, and grab handle 31 position is provided with the switch 6 for controlling the motor start and stop in casing 3, the lower end of casing 3 is provided with dc-battery bag 5, upper head 32 place of casing 3 has rifle mouth portion 4, and rifle mouth portion 4 is equipped with the nail hitting unit 7 for impacting the securing members such as nail.

In present embodiment, power brick 5 and grab handle 31 are essentially coaxially arranged, the housing of power brick 5 and the adjacent place of casing 3, and the outer surface smoother of the two adjoins, being inserted at least partially in casing 3 of power brick 5, makes the connection between power brick 5 and casing 3 more firm; In other embodiments, the power brick 5 of electric hammer of the present invention also can the longitudinal axis direction of grab handle 31 relatively parallel or vertically arrange; Also be not limited to dc-battery bag power, can Alternating Current Power Supply be adopted.

After half casing 3 is removed, the structure between its inner each parts can be clear that, motor 2 is mounted with in casing 3, the rotary motion of motor 2 changes the percussion action to nail hitting unit 7 into by transmission mechanism 10, composition graphs 2 to Fig. 4, transmission mechanism 10 comprises can the geared portions of vertical duction and the impact assembly 8 for impacting nail hitting unit 7, nail hitting unit 7 comprises the impact axle 9 of a reciprocally rectilinear motion, impact assembly 8 to comprise beater wheel 12 and support the jackshaft of this beater wheel 12, in present embodiment, jackshaft is configured to the rotating shaft 11 be rotatably supported in case head 32, in other embodiments, this jackshaft also can be a fixed axis, rotating shaft 11 and beater wheel 12 have identical rotation X, this rotation X is vertical with the output axis Y of motor, rotating shaft 11 passes through two ends supports support in case head 32, and driven by the transmission output member of transmission mechanism 10, in present embodiment, the transmission output member of rotating shaft 11 and transmission mechanism 10 is connected, in other embodiments, also rotating shaft 11 and transmission output member can be made an overall (not shown), the plate-like of beater wheel 12 roughly in hollow, and be sleeved on rotating shaft 11 by its hollow space, beater wheel 12 is provided with at least one, preferably, its rotation is provided with two symmetrically by outer circumference surface impact portion 121 outwardly relatively, in the process that rotating shaft 11 drives beater wheel 12 to rotate, the impact portion 121 of beater wheel 12 periodically impact continuously impact axle 9 by impact part, thus the front end of impact axle 9 periodically impacts on the securing members such as nail continuously, nail little by little knocks into workpiece to be processed by final realization.

At the suit position of rotating shaft 11 and beater wheel 12, the external cylindrical surface of rotating shaft 11 and the inner cylinder face of beater wheel 12 are shaped with respectively a pair skewed slot 115 that tilts of direction and guide groove 125 to axial, the position of each guide groove 125 and each skewed slot 115 is corresponding respectively, the groove that a pair steel ball 14 lays respectively at corresponding skewed slot 115 and guide groove 125 connects in formed cavity volume, and the change of the cavity volume position that can cause along with the change because of skewed slot 115 and guide groove 125 relative position and moving.So the steel ball 14 by being positioned at skewed slot 115 when rotating shaft 11 rotates to be exerted pressure to guide groove 125 and is driven beater wheel 12 to rotate.Energy-storaging spring 13 is loaded in casing 3, and its position, one end 132 is fixed, and the other end 131 withstands on a side of beater wheel 12.This energy-storaging spring 13 is along the axis direction of beater wheel 12 to beater wheel 12 applied thrust, make rotating shaft 11 and beater wheel 12 when static and unloaded rotation, steel ball 14 is positioned at the top of skewed slot 115 and the bottom of guide groove 125, and beater wheel 12 is in the first axial location relative to rotating shaft 11; Work as starter motor, when beater wheel 12 impacts impact axle 9 with the impact portion 121 that rotating shaft 11 rotates on it, realize the one-shot to impact axle 9, simultaneously, because that one end of the impact axle 9 now contacted with beater wheel 12 temporarily can stop further rotating of beater wheel 12, to force beater wheel 12 under the effect of groove 115,125 and wherein steel ball 14, there is axial displacement relative to rotating shaft 11 in the second place towards compress energy storage spring 13; Depart from by the situation of stall after beater wheel 12 moves to the contact of the nail hitting axle 9 that staggers, by discharge elastic potential energy at energy-storaging spring 13 effect under, to surmount the speed rotation that rotating shaft 11 normally revolves speed, and be again moved to primary importance, rotating potential energy by it causes beater wheel 12 to impacting the strong impact of axle 9, high-efficient impacting impact axle 9 again.

As shown in Figure 2, the impact axle 9 of nail hitting unit 7 is roughly on the position, middle of case head 32, the both sides 321 of case head 32, 322 is substantially equal to the distance of impact axle 9, the rotating shaft 11 impacting assembly 8 is supported in case head 32 by the direction of the axes normal of the relative impact axle of transverse direction, the two ends of rotating shaft 11 respectively with the both sides 321 of case head 32, 322 is corresponding, therefore, the lateral dimension of rotating shaft 11 directly decides the width between case head 32 both sides, rotating shaft 11 is rotatably by first, second supports support, in present embodiment, first, second support member is respectively by clutch shaft bearing 15, and second bearing 16 provide, clutch shaft bearing 15 has one near the first end 151 and of beater wheel 12 away from the second end 152 of beater wheel 12, one end topmast of energy-storaging spring 13 is on the position 153 between the first end 151 and the second end 152 of clutch shaft bearing 15, in present embodiment, position 153 is configured to the step surface lower than first end 151 end face, in other embodiments, position 153 also can be configured to other forms, as long as it is lower than first end 151 and then form a recessed structure that partly can insert into the inner for energy-storaging spring 13, namely fall in the concept of present embodiment.

Composition graphs 3, energy-storaging spring 13 can also be multiple, the axle center of relative rotation axi 11 is symmetrically distributed in the periphery of rotating shaft 11, extend in the hollow space that the first end 151 of clutch shaft bearing 15 surrounds to several energy-storaging spring 13, cause clutch shaft bearing 15 and energy-storaging spring 13 axially interlocking at rotating shaft 11, that deposits dimensionally is overlapping, make structure compacter, simultaneously, the length again with enough supporting rotating shafts 11 between the first end 151 of clutch shaft bearing 15 and the second end 152, support more firm, not easy to wear.When energy-storaging spring 13 is for being provided by a big spring, see Fig. 2, the first end 151 of clutch shaft bearing 15 extend in the hollow of this big spring spring body formation, equally, to there is size in energy-storaging spring 13 and clutch shaft bearing 15 overlapping on the direction along rotating shaft 11 axis, and compact conformation, does not repeat.

In an embodiment of the present invention, as shown in Figures 2 to 4, the large bevel gear 102 driving the transmission mechanism 10 be connected can be exported by transmission with rotating shaft 11 and the cone pinion 101 engaged with it provide, the installation axis Y1 of the second bearing 16 and cone pinion 101 is positioned at the homonymy of large bevel gear 102, second bearing 16 is positioned at the dimensional space that cone pinion 101 is formed in the radial direction thereof, make the mechanism of machine intimate compacter, further, see Fig. 2 and Fig. 3, the installation axis Y1 of the second bearing 16 and cone pinion 101 is in together on the position between large bevel gear 102 and beater wheel 12, under this arrangement states, the diameter (boundary that in Fig. 2, dotted line L shows) that wherein any one parts all can not exceed motor housing even can be configured to cone pinion 101 other transmission components 105 coaxial mounted.

In another embodiment of the present invention, as shown in Figure 5, the first roller gear 102 ' driving the transmission mechanism 10 be connected can be exported by transmission with rotating shaft 11 and the second roller gear 101 ' engaged with it provide, and on the cone pinion 21 running part of vertical duction is arranged on motor output shaft and the large bevel gear 103 engaged with it, because the first roller gear 102 ' and the pivot axis of the second roller gear 101 ' that engages with it are parallel to each other, make internal mechanism compacter, case head 32 both sides 321, transverse width between 322 is less, be more suitable for impacting the securing member in small space.

Pass through the various embodiments described above, electric hammer of the present invention can do very small and exquisite, its internal structure can arrange closely, particularly, rotating shaft 11 along the axial length on its axis X direction, this axial length can be limited by the distance the left side 111 of rotating shaft 11 to right side 112, this rotating shaft 11 length axially can be less than 1.4 relative to the ratio of the diameter D of motor 2, when rotating shaft 11 length is axially with when the diameter D of motor 2 is equal, namely when rotating shaft 11 length is axially 1 relative to the ratio of the diameter D of motor 2, the case head 32 accommodating rotating shaft 11 can be made roughly concordant with the case surface of the grab handle 31 accommodating motor 2.

Disclosed electric hammer is not limited to the structure representated by the content described in above embodiment and accompanying drawing; the apparent change that basis of the present invention is done the shape of wherein component and position, to substitute or amendment, all within the scope of protection of present invention.

Claims

1. an electric hammer, comprises:

Casing, is supported with nail hitting unit;

Be placed in the motor in casing, by motor-driven transmission mechanism and impact assembly;

Described impact assembly comprises beater wheel and supports the jackshaft of described beater wheel, the impact part of beater wheel impact described nail hitting unit by impact axle, jackshaft is supported on the first support member and the second support member, first support member and the second support member lay respectively at the both sides of described impact assembly, flexible of topmast between beater wheel and the first support member;

It is characterized in that: described first support member has near the first end of described beater wheel and the second end away from described beater wheel, multiple first support portion is also extended towards described first end in position between described first end and described second end, the number of described elastic component is corresponding with the number of described first support portion, each described elastic component part to be sheathed on described first support portion and topmast on the described position between the described first end and described second end of described first support member, described elastic component and described first support member are staggered along axially having of described jackshaft.

2. electric hammer according to claim 1, is characterized in that: described transmission mechanism comprises the first driving member and the second driving member, and the first driving member drives with described jackshaft and is connected, the axis of described second driving member and the axis being parallel of the first driving member.